/* roulang page: index */
:root {
  --deep-bg: #081A30;
  --deep-bg2: #0D2440;
  --brand-blue: #1B6DF2;
  --brand-blue-hover: #1557C4;
  --energy-green: #00E0B8;
  --hot: #FF6B4A;
  --light-bg: #F5F8FC;
  --white: #FFFFFF;
  --text-dark: #16233D;
  --text-secondary: #5A6B82;
  --text-light: #EBF2FB;
  --border-light: rgba(22,35,61,.08);
  --border-dark: rgba(255,255,255,.10);
  --radius-card: 16px;
  --radius-btn: 999px;
  --radius-badge: 6px;
  --shadow-card-light: 0 8px 30px rgba(22,35,61,.06);
  --shadow-card-dark: 0 12px 40px rgba(4,17,36,.35);
  --transition-base: .25s ease;
  --gap-section: 96px;
  --font-family: 'PingFang SC','Microsoft YaHei','Noto Sans CJK SC','Source Han Sans SC',sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font-family);font-size:16px;line-height:1.625;color:var(--text-dark);background:var(--light-bg);padding-bottom:80px;-webkit-font-smoothing:antialiased}
a{color:var(--brand-blue);text-decoration:none;transition:color var(--transition-base)}
a:hover{color:var(--brand-blue-hover)}
img{max-width:100%;height:auto;display:block}
button{font-family:inherit;cursor:pointer}
input,textarea{font-family:inherit}
.container{max-width:1200px}
.text-center{text-align:center}

/* 按钮 */
.btn{border-radius:var(--radius-btn);font-weight:600;padding:10px 28px;transition:all var(--transition-base);border:1px solid transparent}
.btn-primary{background:linear-gradient(135deg,#1B6DF2,#0E5ADB);color:#fff;border:none;box-shadow:0 0 24px rgba(27,109,242,.38)}
.btn-primary:hover{background:linear-gradient(135deg,#1557C4,#0B4AC0);color:#fff;transform:translateY(-2px);box-shadow:0 0 36px rgba(27,109,242,.50)}
.btn-primary:active{transform:translateY(0);box-shadow:0 0 18px rgba(27,109,242,.30)}
.btn-outline-primary{border:1px solid var(--brand-blue);color:var(--brand-blue);background:transparent}
.btn-outline-primary:hover{background:rgba(27,109,242,.08);color:var(--brand-blue-hover);border-color:var(--brand-blue-hover)}
.btn-outline-light{border:1px solid rgba(255,255,255,.55);color:#fff;background:rgba(255,255,255,.06);backdrop-filter:blur(8px)}
.btn-outline-light:hover{background:rgba(255,255,255,.14);color:#fff;border-color:rgba(255,255,255,.8);transform:translateY(-2px)}
.btn-lg{padding:14px 42px;font-size:1.0625rem}
.btn-sm{padding:8px 22px;font-size:.875rem}
.btn-glow{box-shadow:0 0 24px rgba(27,109,242,.38)}

/* 导航 */
.site-nav{background:#fff;min-height:64px;box-shadow:0 4px 20px rgba(10,30,60,.06);border-bottom:1px solid var(--border-light);padding:0}
.site-nav .navbar-brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.25rem;color:var(--text-dark);letter-spacing:-.01em}
.site-nav .navbar-brand:hover{color:var(--text-dark)}
.brand-icon{width:28px;height:28px;border-radius:8px;background:linear-gradient(135deg,#00E0B8,#1B6DF2);display:flex;align-items:center;justify-content:center;color:#fff;font-size:13px;flex-shrink:0}
.site-nav .navbar-nav{gap:4px}
.site-nav .nav-link{color:var(--text-dark);font-weight:500;font-size:15px;padding:8px 14px!important;border-radius:8px;position:relative;transition:color var(--transition-base)}
.site-nav .nav-link:hover{color:var(--brand-blue)}
.site-nav .nav-item.active .nav-link{color:var(--brand-blue);font-weight:600}
.site-nav .nav-item.active .nav-link::after{content:'';position:absolute;bottom:-1px;left:14px;right:14px;height:2px;border-radius:2px;background:var(--brand-blue)}
.nav-actions{display:flex;align-items:center;gap:14px}
.nav-search{position:relative;width:200px}
.nav-search .fa-search{position:absolute;left:14px;top:50%;transform:translateY(-50%);color:var(--text-secondary);font-size:14px;pointer-events:none}
.nav-search input{width:100%;height:36px;border:1px solid rgba(22,35,61,.12);border-radius:999px;padding:0 14px 0 38px;font-size:13px;background:var(--light-bg);color:var(--text-dark);outline:none;transition:border-color var(--transition-base),box-shadow var(--transition-base)}
.nav-search input:focus{border-color:var(--brand-blue);box-shadow:0 0 0 3px rgba(27,109,242,.15);background:#fff}
.navbar-toggler{border:none;padding:6px 10px;font-size:20px;color:var(--text-dark);border-radius:8px}
.navbar-toggler:focus{box-shadow:none}

/* Hero */
.hero{background:linear-gradient(145deg,#081A30,#0D2440);position:relative;min-height:78vh;display:flex;align-items:center;overflow:hidden;color:var(--text-light)}
.hero::before{content:'';position:absolute;inset:0;background-image:url('/assets/images/backpic/back-1.png');background-size:cover;background-position:center;opacity:.32;pointer-events:none}
.hero::after{content:'';position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);background-size:48px 48px;opacity:.5;pointer-events:none}
.hero .container{position:relative;z-index:2}
.hero-content{padding:60px 0}
.hero-eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;letter-spacing:.02em;color:var(--energy-green);background:rgba(0,224,184,.1);border:1px solid rgba(0,224,184,.25);border-radius:999px;padding:6px 16px;margin-bottom:20px;font-weight:500}
.hero-eyebrow i{font-size:14px}
.hero-title{font-size:clamp(2rem,5vw,3.25rem);font-weight:800;line-height:1.2;color:#fff;letter-spacing:-.01em;margin-bottom:18px}
.hero-subtitle{font-size:1.125rem;color:rgba(235,242,251,.8);line-height:1.6;margin-bottom:32px;max-width:520px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:42px}
.hero-stats{display:flex;gap:0}
.stat-item{padding:0 28px;position:relative}
.stat-item:first-child{padding-left:0}
.stat-item:not(:first-child)::before{content:'';position:absolute;left:0;top:12%;bottom:12%;width:1px;background:rgba(255,255,255,.14)}
.stat-num{display:block;font-size:1.75rem;font-weight:800;color:var(--energy-green);line-height:1.2}
.stat-label{font-size:.8125rem;color:rgba(235,242,251,.6);margin-top:4px}
.hero-card-wrap{position:relative;padding:30px 0 30px 30px}
.hero-card{background:rgba(255,255,255,.055);backdrop-filter:blur(16px) saturate(140%);-webkit-backdrop-filter:blur(16px) saturate(140%);border:1px solid rgba(255,255,255,.12);border-radius:20px;padding:18px;box-shadow:var(--shadow-card-dark);position:relative}
.hero-card .card-img{width:100%;height:260px;object-fit:cover;border-radius:14px}
.card-img-wrap{position:relative;border-radius:14px;overflow:hidden}
.float-tag{position:absolute;background:rgba(235,242,251,.14);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.22);border-radius:999px;padding:6px 14px;font-size:12px;color:#fff;display:flex;align-items:center;gap:6px;box-shadow:0 4px 16px rgba(4,17,36,.3);transition:transform var(--transition-base)}
.float-tag:hover{transform:translateY(-3px)}
.float-tag i{color:var(--energy-green);font-size:12px}
.float-tag-1{top:14px;left:14px}
.float-tag-2{top:14px;right:14px}
.float-tag-3{bottom:14px;left:14px}

/* 信任条 */
.trust-bar{background:var(--light-bg);padding:36px 0;border-bottom:1px solid var(--border-light)}
.trust-list{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px}
.trust-list span{font-size:1rem;font-weight:600;color:#8494A8;letter-spacing:.03em;transition:color var(--transition-base)}
.trust-list span:hover{color:var(--brand-blue)}

/* 卖点 */
.features{background:linear-gradient(160deg,#081A30,#0D2440);padding:var(--gap-section) 0;position:relative;overflow:hidden}
.features::before{content:'';position:absolute;top:-80px;right:-80px;width:300px;height:300px;background:radial-gradient(circle,rgba(27,109,242,.15),transparent 70%);pointer-events:none}
.section-eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:.8125rem;letter-spacing:.02em;color:var(--energy-green);font-weight:600;text-transform:uppercase;margin-bottom:12px}
.section-eyebrow::before{content:'';width:24px;height:2px;background:var(--energy-green);border-radius:2px}
.section-title{font-size:clamp(1.5rem,3vw,2.25rem);font-weight:700;line-height:1.3;margin-bottom:14px}
.section-desc{font-size:1rem;line-height:1.7;max-width:640px}
.features-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:24px;margin-top:48px}
.feature-card{background:rgba(255,255,255,.055);backdrop-filter:blur(16px) saturate(140%);-webkit-backdrop-filter:blur(16px) saturate(140%);border:1px solid rgba(255,255,255,.12);border-radius:16px;padding:30px;box-shadow:var(--shadow-card-dark);transition:transform var(--transition-base),box-shadow var(--transition-base),border-color var(--transition-base)}
.feature-card:hover{transform:translateY(-6px);border-color:rgba(0,224,184,.35);box-shadow:0 18px 50px rgba(4,17,36,.5)}
.feature-icon{width:48px;height:48px;border-radius:12px;background:linear-gradient(135deg,rgba(0,224,184,.2),rgba(27,109,242,.2));display:flex;align-items:center;justify-content:center;font-size:20px;color:var(--energy-green);margin-bottom:20px;border:1px solid rgba(0,224,184,.25)}
.feature-card h3{color:#fff;font-size:1.25rem;font-weight:600;margin-bottom:12px}
.feature-card p{color:rgba(235,242,251,.65);font-size:.9375rem;line-height:1.65}
.feature-main{display:flex;flex-direction:column;justify-content:center;min-height:320px}
.feature-side-cards{display:grid;grid-template-rows:1fr 1fr;gap:24px}
.feature-accent{border-color:rgba(0,224,184,.3)}

/* 场景演示 */
.scenes{background:var(--light-bg);padding:var(--gap-section) 0;position:relative}
.scenes-grid{display:grid;grid-template-columns:1.25fr 1fr;gap:24px;margin-top:48px}
.scene-main{position:relative;border-radius:16px;overflow:hidden;min-height:360px;box-shadow:var(--shadow-card-light);cursor:pointer}
.scene-main img,.scene-item img{width:100%;height:100%;object-fit:cover;transition:transform .4s ease}
.scene-main:hover img,.scene-item:hover img{transform:scale(1.03)}
.scene-main .scene-overlay{position:absolute;inset:0;background:linear-gradient(180deg,transparent 40%,rgba(8,26,48,.75));display:flex;align-items:flex-end;padding:24px}
.scene-main .scene-tag{background:rgba(255,255,255,.18);backdrop-filter:blur(8px);border:1px solid rgba(255,255,255,.25);border-radius:999px;padding:6px 16px;color:#fff;font-size:13px;display:inline-flex;align-items:center;gap:6px}
.scene-side{display:grid;grid-template-rows:1fr 1fr;gap:24px}
.scene-item{position:relative;border-radius:16px;overflow:hidden;min-height:180px;box-shadow:var(--shadow-card-light);cursor:pointer}
.scene-item .scene-overlay{position:absolute;inset:0;background:linear-gradient(180deg,transparent 50%,rgba(8,26,48,.65));display:flex;align-items:flex-end;padding:16px}
.scene-item .scene-tag{background:rgba(255,255,255,.18);backdrop-filter:blur(8px);border:1px solid rgba(255,255,255,.25);border-radius:999px;padding:5px 12px;color:#fff;font-size:12px;display:inline-flex;align-items:center;gap:6px}

/* 社会认同 */
.testimonials{background:linear-gradient(160deg,#081A30,#0D2440);padding:var(--gap-section) 0;position:relative;overflow:hidden}
.testimonials::before{content:'';position:absolute;bottom:-80px;left:-80px;width:300px;height:300px;background:radial-gradient(circle,rgba(0,224,184,.12),transparent 70%);pointer-events:none}
.testimonial-card{background:rgba(255,255,255,.055);backdrop-filter:blur(16px) saturate(140%);-webkit-backdrop-filter:blur(16px) saturate(140%);border:1px solid rgba(255,255,255,.1);border-radius:16px;padding:32px;height:100%;transition:transform var(--transition-base),border-color var(--transition-base)}
.testimonial-card:hover{transform:translateY(-6px);border-color:rgba(0,224,184,.3)}
.testimonial-header{display:flex;align-items:center;gap:14px;margin-bottom:18px}
.testimonial-avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,#1B6DF2,#00E0B8);display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:18px}
.testimonial-name{color:#fff;font-weight:600;font-size:.9375rem}
.testimonial-role{color:rgba(235,242,251,.5);font-size:.8125rem}
.testimonial-text{color:rgba(235,242,251,.75);font-size:.9375rem;line-height:1.7;margin-bottom:16px}
.testimonial-rating{color:var(--energy-green);font-size:13px;letter-spacing:2px}

/* 最新动态 */
.news-section{background:var(--light-bg);padding:var(--gap-section) 0}
.news-card{display:flex;flex-direction:column;background:#fff;border:1px solid var(--border-light);border-radius:16px;padding:24px;box-shadow:var(--shadow-card-light);transition:transform var(--transition-base),box-shadow var(--transition-base);height:100%;color:inherit}
.news-card:hover{transform:translateY(-4px);box-shadow:0 16px 44px rgba(22,35,61,.12);color:inherit}
.news-badge{display:inline-flex;align-items:center;background:rgba(27,109,242,.1);color:var(--brand-blue);font-size:12px;font-weight:600;border-radius:6px;padding:4px 12px;margin-bottom:14px;width:fit-content}
.news-card h3{font-size:1.0625rem;font-weight:600;color:var(--text-dark);line-height:1.45;margin-bottom:10px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-card p{font-size:.875rem;color:var(--text-secondary);line-height:1.6;margin-bottom:18px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-card-footer{display:flex;align-items:center;justify-content:space-between;margin-top:auto}
.news-card-footer time{font-size:.8125rem;color:var(--text-secondary)}
.news-arrow{width:32px;height:32px;border-radius:50%;background:rgba(27,109,242,.08);display:flex;align-items:center;justify-content:center;color:var(--brand-blue);font-size:13px;transition:background var(--transition-base)}
.news-card:hover .news-arrow{background:var(--brand-blue);color:#fff}
.empty-state{text-align:center;padding:60px 20px;background:#fff;border-radius:16px;border:1px dashed rgba(22,35,61,.15)}
.empty-state i{font-size:36px;color:#B8C4D4;margin-bottom:14px}
.empty-state p{color:var(--text-secondary);font-size:.9375rem}

/* FAQ */
.faq-section{background:var(--light-bg);padding:var(--gap-section) 0;padding-top:0}
.accordion-item{background:#fff;border:1px solid var(--border-light)!important;border-radius:20px!important;overflow:hidden;margin-bottom:16px;box-shadow:var(--shadow-card-light)}
.accordion-button{min-height:48px;font-weight:600;color:var(--text-dark);background:transparent;padding:16px 24px;font-size:1rem;transition:color var(--transition-base)}
.accordion-button:not(.collapsed){background:rgba(27,109,242,.04);color:var(--brand-blue);box-shadow:none}
.accordion-button:focus{box-shadow:none;border-color:transparent}
.accordion-button::after{content:'+';background:none;font-size:22px;font-weight:300;width:auto;height:auto;transition:transform .2s ease;color:var(--brand-blue)}
.accordion-button:not(.collapsed)::after{transform:rotate(45deg)}
.accordion-body{padding:0 24px 20px;color:var(--text-secondary);font-size:.9375rem;line-height:1.75;border-top:1px solid rgba(22,35,61,.06);padding-top:16px}

/* CTA */
.cta-section{background:linear-gradient(145deg,#0A1D3A,#081A30);padding:var(--gap-section) 0;position:relative;overflow:hidden;text-align:center}
.cta-section::before{content:'';position:absolute;inset:0;background-image:url('/assets/images/backpic/back-2.webp');background-size:cover;background-position:center;opacity:.18;pointer-events:none}
.cta-section::after{content:'';position:absolute;top:50%;left:50%;width:500px;height:500px;transform:translate(-50%,-50%);background:radial-gradient(circle,rgba(27,109,242,.2),transparent 70%);pointer-events:none}
.cta-section .container{position:relative;z-index:2}
.cta-section h2{color:#fff;font-size:clamp(1.5rem,3vw,2.5rem);font-weight:700;margin-bottom:14px}
.cta-section p{color:rgba(235,242,251,.7);font-size:1.0625rem;margin-bottom:36px}
.cta-actions{display:flex;justify-content:center;gap:16px;flex-wrap:wrap}

/* Footer */
.site-footer{background:#050E1C;color:rgba(235,242,251,.6);padding:64px 0 0;font-size:.875rem}
.site-footer .footer-brand{display:flex;align-items:center;gap:10px;font-size:1.25rem;font-weight:800;color:#fff;margin-bottom:16px}
.site-footer .footer-brand .brand-icon{width:28px;height:28px;border-radius:8px;background:linear-gradient(135deg,#00E0B8,#1B6DF2);display:flex;align-items:center;justify-content:center;color:#fff;font-size:13px}
.site-footer p{line-height:1.7;margin-bottom:16px}
.site-footer h4{color:#fff;font-size:.9375rem;font-weight:600;margin-bottom:16px;position:relative;padding-bottom:10px}
.site-footer h4::after{content:'';position:absolute;bottom:0;left:0;width:24px;height:2px;background:var(--energy-green);border-radius:2px}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer ul li{margin-bottom:10px}
.site-footer ul a{color:rgba(235,242,251,.6);transition:color var(--transition-base)}
.site-footer ul a:hover{color:var(--energy-green)}
.site-footer ul li i{width:18px;color:var(--energy-green);margin-right:6px}
.social-icons{display:flex;gap:12px;margin-top:20px}
.social-icons a{width:36px;height:36px;border-radius:50%;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);display:flex;align-items:center;justify-content:center;color:rgba(235,242,251,.7);transition:all var(--transition-base)}
.social-icons a:hover{background:var(--brand-blue);border-color:var(--brand-blue);color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);margin-top:48px;padding:20px 0;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:8px;font-size:.8125rem;color:rgba(235,242,251,.4)}
.footer-bottom a{color:rgba(235,242,251,.4)}

/* 底部固定条 */
.fixed-cta-bar{position:fixed;bottom:0;left:0;right:0;height:64px;background:rgba(8,26,48,.85);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);z-index:1050;border-top:1px solid rgba(255,255,255,.1);display:flex;align-items:center}
.fixed-cta-inner{display:flex;align-items:center;justify-content:space-between;gap:16px}
.fixed-cta-text{color:#fff;font-size:.9375rem;font-weight:500}
.fixed-cta-actions{display:flex;align-items:center;gap:14px}
.fixed-cta-close{width:28px;height:28px;border-radius:50%;border:1px solid rgba(255,255,255,.2);background:transparent;color:rgba(255,255,255,.6);display:flex;align-items:center;justify-content:center;font-size:12px;transition:all var(--transition-base)}
.fixed-cta-close:hover{background:rgba(255,255,255,.15);color:#fff}

/* 响应式 */
@media (max-width:1199px){
  .nav-search{width:160px}
  .hero-stats{flex-wrap:wrap;gap:12px 0}
}
@media (max-width:991px){
  :root{--gap-section:64px}
  .site-nav .navbar-collapse{background:#fff;border-radius:16px;padding:16px;box-shadow:0 20px 40px rgba(10,30,60,.1);margin-top:12px}
  .nav-actions{width:100%;margin-top:12px;flex-direction:column;align-items:stretch}
  .nav-search{width:100%}
  .nav-search input{width:100%}
  .nav-actions .btn{width:100%;text-align:center}
  .features-grid{grid-template-columns:1fr}
  .feature-main{min-height:auto}
  .feature-side-cards{grid-template-rows:auto}
  .scenes-grid{grid-template-columns:1fr}
  .scene-main{min-height:280px}
  .scene-side{grid-template-rows:auto}
  .scene-item{min-height:160px}
  .hero-card-wrap{padding-left:0;padding-top:20px}
  .trust-list{justify-content:center}
}
@media (max-width:767px){
  :root{--gap-section:48px}
  .site-nav{min-height:56px}
  .hero{min-height:auto;padding:60px 0}
  .hero-content{padding:30px 0}
  .hero-actions{flex-direction:column;align-items:stretch}
  .hero-actions .btn{width:100%;text-align:center}
  .hero-stats{justify-content:space-between}
  .stat-item{padding:0 14px}
  .features-grid{gap:16px}
  .feature-side-cards{gap:16px}
  .scenes-grid{gap:16px}
  .scene-side{gap:16px}
  .section-title{font-size:1.4rem}
  .cta-actions{flex-direction:column;align-items:stretch}
  .cta-actions .btn{width:100%;text-align:center}
  .footer-bottom{flex-direction:column;text-align:center}
  .fixed-cta-text{font-size:.8125rem}
  .btn{padding:8px 20px}
}
@media (max-width:520px){
  .hero-title{font-size:1.75rem}
  .hero-subtitle{font-size:.9375rem}
  .stat-num{font-size:1.4rem}
  .hero-card .card-img{height:200px}
  .float-tag{font-size:11px;padding:4px 10px}
  .feature-card{padding:22px}
  .testimonial-card{padding:24px}
  .news-card{padding:20px}
}

/* roulang page: article */
:root {
            --clr-primary: #1B6DF2;
            --clr-primary-dark: #1557C4;
            --clr-accent: #00E0B8;
            --clr-accent-hover: #31F0CD;
            --clr-dark-bg: #081A30;
            --clr-dark-bg-2: #0D2440;
            --clr-light-bg: #F5F8FC;
            --clr-white: #FFFFFF;
            --clr-text-dark: #16233D;
            --clr-text-light: #5A6B82;
            --clr-text-deep: #2D3B52;
            --clr-text-dark-bg: #EBF2FB;
            --border-light: rgba(22,35,61,.08);
            --border-dark: rgba(255,255,255,.10);
            --radius-card: 16px;
            --radius-btn: 999px;
            --radius-badge: 6px;
            --radius-input: 10px;
            --radius-img: 14px;
            --shadow-card: 0 12px 40px rgba(4,17,36,.35);
            --shadow-light: 0 8px 30px rgba(22,35,61,.06);
            --transition: .25s ease;
        }
        *, *::before, *::after {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            margin: 0;
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;
            font-size: 16px;
            line-height: 1.625;
            color: var(--clr-text-dark);
            background: var(--clr-light-bg);
            -webkit-font-smoothing: antialiased;
        }
        a {
            text-decoration: none;
            color: var(--clr-primary);
            transition: color var(--transition);
        }
        a:hover {
            color: var(--clr-primary-dark);
        }
        img {
            max-width: 100%;
            display: block;
        }
        button, input, select, textarea {
            font-family: inherit;
        }
        .container {
            max-width: 1200px;
        }
        /* ===== 导航 ===== */
        .site-nav {
            background: #fff;
            border-bottom: 1px solid var(--border-light);
            box-shadow: 0 4px 20px rgba(10, 30, 60, .06);
            min-height: 64px;
            padding: 0;
            z-index: 1040;
            position: relative;
        }
        .site-nav .container {
            min-height: 64px;
            display: flex;
            align-items: center;
            flex-wrap: nowrap;
        }
        .navbar-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 0;
            margin: 0;
            flex-shrink: 0;
        }
        .brand-icon {
            width: 30px;
            height: 30px;
            border-radius: 9px;
            background: linear-gradient(135deg, var(--clr-accent), var(--clr-primary));
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 14px;
            box-shadow: 0 0 18px rgba(0, 224, 184, .25);
        }
        .brand-text {
            font-weight: 700;
            font-size: 18px;
            color: var(--clr-text-dark);
            letter-spacing: -0.01em;
            white-space: nowrap;
        }
        .site-nav .navbar-nav {
            gap: 6px;
        }
        .site-nav .nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--clr-text-light);
            padding: 20px 16px;
            position: relative;
            white-space: nowrap;
            transition: color var(--transition);
        }
        .site-nav .nav-link::after {
            content: "";
            position: absolute;
            left: 16px;
            right: 16px;
            bottom: 0;
            height: 2px;
            border-radius: 999px;
            background: linear-gradient(90deg, var(--clr-primary), var(--clr-accent));
            opacity: 0;
            transform: scaleX(.4);
            transition: all .3s ease;
        }
        .site-nav .nav-link:hover {
            color: var(--clr-primary);
        }
        .site-nav .nav-link:hover::after {
            opacity: 1;
            transform: scaleX(1);
        }
        .site-nav .nav-item.active .nav-link {
            color: var(--clr-primary);
            font-weight: 600;
        }
        .site-nav .nav-item.active .nav-link::after {
            opacity: 1;
            transform: scaleX(1);
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 14px;
            flex-shrink: 0;
        }
        .nav-search {
            position: relative;
            width: 200px;
        }
        .nav-search i {
            position: absolute;
            left: 14px;
            top: 50%;
            transform: translateY(-50%);
            color: #98A6BA;
            font-size: 13px;
            pointer-events: none;
        }
        .nav-search input {
            width: 100%;
            height: 38px;
            border: 1px solid rgba(22, 35, 61, .1);
            border-radius: 999px;
            background: var(--clr-light-bg);
            padding: 0 14px 0 38px;
            font-size: 14px;
            color: var(--clr-text-dark);
            outline: none;
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .nav-search input:focus {
            border-color: var(--clr-primary);
            box-shadow: 0 0 0 3px rgba(27, 109, 242, .15);
            background: #fff;
        }
        .navbar-toggler {
            border: none;
            background: transparent;
            color: var(--clr-text-dark);
            font-size: 20px;
            padding: 6px 10px;
            outline: none;
        }
        .navbar-toggler:focus {
            box-shadow: none;
        }
        .btn-glow {
            background: linear-gradient(135deg, #1B6DF2, #0E5ADB);
            border: none;
            color: #fff;
            border-radius: 999px;
            padding: 9px 24px;
            font-weight: 600;
            font-size: 14px;
            box-shadow: 0 0 24px rgba(27, 109, 242, .38);
            transition: all var(--transition);
            white-space: nowrap;
        }
        .btn-glow:hover, .btn-glow:focus {
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 0 36px rgba(27, 109, 242, .5);
        }
        .btn-glow:active {
            transform: translateY(0);
            box-shadow: 0 0 20px rgba(27, 109, 242, .3);
        }
        .btn-outline-glass {
            background: rgba(255, 255, 255, .08);
            border: 1px solid rgba(255, 255, 255, .25);
            color: #EBF2FB;
            border-radius: 999px;
            padding: 9px 24px;
            font-weight: 500;
            font-size: 14px;
            backdrop-filter: blur(8px);
            transition: all var(--transition);
        }
        .btn-outline-glass:hover {
            background: rgba(255, 255, 255, .15);
            border-color: rgba(255, 255, 255, .4);
            color: #fff;
        }
        /* ===== 面包屑 ===== */
        .article-breadcrumb {
            background: #fff;
            border-bottom: 1px solid var(--border-light);
            padding: 18px 0;
        }
        .article-breadcrumb .breadcrumb-list {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 14px;
            color: var(--clr-text-light);
            margin: 0;
            padding: 0;
            list-style: none;
        }
        .article-breadcrumb .breadcrumb-list li {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .article-breadcrumb .breadcrumb-list li + li::before {
            content: "/";
            color: #C5D0DE;
            font-size: 13px;
        }
        .article-breadcrumb .breadcrumb-list a {
            color: var(--clr-text-light);
            transition: color var(--transition);
        }
        .article-breadcrumb .breadcrumb-list a:hover {
            color: var(--clr-primary);
        }
        .article-breadcrumb .breadcrumb-current {
            color: var(--clr-text-dark);
            font-weight: 500;
            max-width: 280px;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }
        /* ===== 文章头部 ===== */
        .article-hero {
            padding: 48px 0 28px;
            background: linear-gradient(180deg, #F5F8FC 0%, #EDF3FA 100%);
        }
        .article-title {
            font-size: clamp(28px, 4vw, 36px);
            font-weight: 700;
            line-height: 1.3;
            color: var(--clr-text-dark);
            letter-spacing: -0.01em;
            margin-bottom: 22px;
            max-width: 860px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 10px 18px;
            font-size: 14px;
            color: var(--clr-text-light);
            margin-bottom: 8px;
        }
        .article-meta .badge {
            background: linear-gradient(135deg, rgba(27, 109, 242, .12), rgba(0, 224, 184, .12));
            color: var(--clr-primary);
            border: 1px solid rgba(27, 109, 242, .15);
            border-radius: var(--radius-badge);
            padding: 4px 12px;
            font-weight: 500;
            font-size: 13px;
        }
        .article-meta .meta-item {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .article-meta .meta-item i {
            color: #98A6BA;
            font-size: 13px;
        }
        .article-meta .meta-item .dot {
            width: 3px;
            height: 3px;
            border-radius: 50%;
            background: #C5D0DE;
            margin: 0 6px;
        }
        /* ===== 正文区域 ===== */
        .article-section {
            padding: 28px 0 72px;
            background: var(--clr-light-bg);
        }
        .article-body {
            background: #fff;
            border-radius: var(--radius-card);
            border: 1px solid rgba(22, 35, 61, .06);
            box-shadow: var(--shadow-light);
            padding: 48px;
            max-width: 860px;
            margin: 0 auto;
        }
        .article-content {
            max-width: 760px;
            margin: 0 auto;
            font-size: 17px;
            line-height: 1.87;
            color: var(--clr-text-deep);
        }
        .article-content h2 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--clr-text-dark);
            margin: 2em 0 1em;
            padding-bottom: 8px;
            border-bottom: 1px solid var(--border-light);
        }
        .article-content h3 {
            font-size: 1.25rem;
            font-weight: 600;
            color: var(--clr-text-dark);
            margin: 1.8em 0 .8em;
        }
        .article-content h4 {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--clr-text-dark);
            margin: 1.5em 0 .6em;
        }
        .article-content p {
            margin-bottom: 1.5em;
        }
        .article-content a {
            color: var(--clr-primary);
            border-bottom: 1px solid rgba(27, 109, 242, .3);
            transition: all var(--transition);
        }
        .article-content a:hover {
            color: var(--clr-primary-dark);
            border-bottom-color: var(--clr-primary-dark);
        }
        .article-content blockquote {
            border-left: 3px solid var(--clr-primary);
            background: var(--clr-light-bg);
            border-radius: 0 10px 10px 0;
            padding: 18px 24px;
            margin: 1.5em 0;
            color: var(--clr-text-light);
            font-style: normal;
        }
        .article-content img {
            border-radius: var(--radius-img);
            margin: 1.5em 0;
            width: auto;
            height: auto;
        }
        .article-content ul, .article-content ol {
            margin: 0 0 1.5em 1.2em;
            padding: 0;
        }
        .article-content li {
            margin-bottom: .5em;
        }
        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5em 0;
            font-size: 15px;
        }
        .article-content th,
        .article-content td {
            border: 1px solid rgba(22, 35, 61, .1);
            padding: 10px 14px;
            text-align: left;
        }
        .article-content th {
            background: var(--clr-light-bg);
            font-weight: 600;
            color: var(--clr-text-dark);
        }
        .article-content pre {
            background: #0F1E38;
            color: #D9E6F7;
            padding: 20px;
            border-radius: 12px;
            overflow-x: auto;
            font-size: 14px;
            line-height: 1.7;
            margin: 1.5em 0;
        }
        .article-content code {
            background: rgba(27, 109, 242, .08);
            color: var(--clr-primary);
            padding: 2px 6px;
            border-radius: 4px;
            font-size: .9em;
            font-family: "SFMono-Regular", Consolas, monospace;
        }
        .article-content pre code {
            background: transparent;
            color: inherit;
            padding: 0;
        }
        .article-content hr {
            border: none;
            border-top: 1px solid var(--border-light);
            margin: 2em 0;
        }
        /* ===== 未找到 ===== */
        .not-found {
            text-align: center;
            padding: 56px 24px;
            color: var(--clr-text-light);
        }
        .not-found i {
            font-size: 42px;
            color: #C5D0DE;
            margin-bottom: 16px;
            display: block;
        }
        .not-found h2 {
            font-size: 22px;
            font-weight: 700;
            color: var(--clr-text-dark);
            margin-bottom: 10px;
        }
        .not-found p {
            margin-bottom: 24px;
            font-size: 15px;
        }
        .not-found .btn {
            min-width: 140px;
        }
        /* ===== 标签 ===== */
        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 36px;
            padding-top: 28px;
            border-top: 1px solid var(--border-light);
        }
        .article-tags .tag-label {
            font-size: 14px;
            color: var(--clr-text-light);
            line-height: 32px;
            margin-right: 4px;
        }
        .article-tags .tag {
            display: inline-block;
            padding: 5px 14px;
            background: var(--clr-light-bg);
            border: 1px solid rgba(22, 35, 61, .08);
            border-radius: 999px;
            font-size: 13px;
            color: var(--clr-text-light);
            transition: all var(--transition);
        }
        .article-tags .tag:hover {
            background: rgba(27, 109, 242, .08);
            border-color: rgba(27, 109, 242, .25);
            color: var(--clr-primary);
        }
        /* ===== 上下篇 ===== */
        .article-pagination {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            margin-top: 28px;
            padding-top: 24px;
            border-top: 1px solid var(--border-light);
        }
        .article-pagination a {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--clr-text-light);
            transition: all var(--transition);
            max-width: 45%;
        }
        .article-pagination a:hover {
            color: var(--clr-primary);
        }
        .article-pagination a.pull-right {
            margin-left: auto;
            text-align: right;
            flex-direction: row-reverse;
        }
        /* ===== 相关推荐 ===== */
        .related-section {
            padding: 72px 0;
            background: #fff;
        }
        .section-head {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
            margin-bottom: 36px;
        }
        .section-title {
            font-size: clamp(1.5rem, 3vw, 2rem);
            font-weight: 700;
            color: var(--clr-text-dark);
            margin: 0;
            letter-spacing: -0.01em;
        }
        .section-title span {
            color: var(--clr-primary);
        }
        .section-sub {
            font-size: 15px;
            color: var(--clr-text-light);
            margin: 8px 0 0;
        }
        .section-link {
            font-size: 14px;
            font-weight: 500;
            color: var(--clr-primary);
            background: rgba(27, 109, 242, .06);
            border: 1px solid rgba(27, 109, 242, .12);
            padding: 8px 18px;
            border-radius: 999px;
            transition: all var(--transition);
        }
        .section-link:hover {
            background: rgba(27, 109, 242, .1);
            border-color: rgba(27, 109, 242, .3);
            color: var(--clr-primary-dark);
        }
        .related-card {
            background: #fff;
            border-radius: var(--radius-card);
            border: 1px solid rgba(22, 35, 61, .06);
            box-shadow: 0 8px 30px rgba(22, 35, 61, .05);
            overflow: hidden;
            height: 100%;
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 16px 40px rgba(22, 35, 61, .12);
        }
        .related-card .card-img-wrap {
            position: relative;
            height: 180px;
            overflow: hidden;
            border-radius: 0;
        }
        .related-card .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .4s ease;
        }
        .related-card:hover .card-img-wrap img {
            transform: scale(1.05);
        }
        .related-card .card-body {
            padding: 20px 22px 22px;
        }
        .related-card .card-cat {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            color: var(--clr-primary);
            background: rgba(27, 109, 242, .08);
            border-radius: 4px;
            padding: 3px 10px;
            margin-bottom: 12px;
        }
        .related-card .card-title {
            font-size: 16px;
            font-weight: 600;
            color: var(--clr-text-dark);
            line-height: 1.45;
            margin-bottom: 10px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            min-height: 46px;
        }
        .related-card .card-title a {
            color: var(--clr-text-dark);
            transition: color var(--transition);
        }
        .related-card .card-title a:hover {
            color: var(--clr-primary);
        }
        .related-card .card-text {
            font-size: 14px;
            color: var(--clr-text-light);
            line-height: 1.6;
            margin-bottom: 14px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-meta {
            font-size: 13px;
            color: #98A6BA;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .related-card .card-meta i {
            margin-right: 4px;
            font-size: 12px;
        }
        /* ===== CTA ===== */
        .article-cta {
            background: linear-gradient(145deg, var(--clr-dark-bg), var(--clr-dark-bg-2));
            padding: 72px 0;
            position: relative;
            overflow: hidden;
        }
        .article-cta::before {
            content: "";
            position: absolute;
            top: -60%;
            left: -20%;
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(27, 109, 242, .18), transparent 60%);
            pointer-events: none;
        }
        .article-cta::after {
            content: "";
            position: absolute;
            bottom: -60%;
            right: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(0, 224, 184, .14), transparent 60%);
            pointer-events: none;
        }
        .article-cta .container {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .article-cta h2 {
            font-size: clamp(1.5rem, 3vw, 2.25rem);
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
            letter-spacing: -0.01em;
        }
        .article-cta p {
            font-size: 15px;
            color: rgba(235, 242, 251, .7);
            margin-bottom: 32px;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
        }
        .article-cta .btn-glow {
            display: inline-block;
            padding: 12px 38px;
            font-size: 15px;
        }
        .article-cta .btn-outline-glass {
            display: inline-block;
            padding: 11px 32px;
            margin-left: 12px;
        }
        /* ===== 页脚 ===== */
        .site-footer {
            background: #050E1C;
            color: rgba(235, 242, 251, .7);
            padding: 64px 0 0;
            font-size: 14px;
            line-height: 1.7;
        }
        .site-footer .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 16px;
        }
        .site-footer .brand-icon {
            width: 30px;
            height: 30px;
            border-radius: 9px;
            background: linear-gradient(135deg, var(--clr-accent), var(--clr-primary));
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 14px;
        }
        .site-footer .footer-brand span:last-child {
            font-size: 18px;
            font-weight: 700;
            color: #fff;
        }
        .site-footer .footer-brand + p {
            margin-bottom: 20px;
            max-width: 360px;
            color: rgba(235, 242, 251, .55);
        }
        .site-footer h4 {
            color: #fff;
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 18px;
        }
        .site-footer ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .site-footer ul li {
            margin-bottom: 10px;
        }
        .site-footer ul li i {
            margin-right: 8px;
            color: var(--clr-accent);
            font-size: 13px;
        }
        .site-footer ul a {
            color: rgba(235, 242, 251, .6);
            transition: all var(--transition);
        }
        .site-footer ul a:hover {
            color: var(--clr-accent);
            padding-left: 3px;
        }
        .social-icons {
            display: flex;
            gap: 12px;
            margin-top: 8px;
        }
        .social-icons a {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: rgba(255, 255, 255, .06);
            border: 1px solid rgba(255, 255, 255, .1);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: rgba(235, 242, 251, .7);
            font-size: 15px;
            transition: all var(--transition);
        }
        .social-icons a:hover {
            background: var(--clr-primary);
            color: #fff;
            border-color: var(--clr-primary);
            transform: translateY(-2px);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, .08);
            padding: 20px 0;
            margin-top: 48px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 8px;
            color: rgba(235, 242, 251, .4);
            font-size: 13px;
        }
        .footer-bottom p {
            margin: 0;
        }
        @media (max-width: 991.98px) {
            .site-nav .container {
                flex-wrap: wrap;
                padding-top: 8px;
                padding-bottom: 8px;
            }
            .nav-search {
                display: none;
            }
            .site-nav .navbar-collapse {
                width: 100%;
                padding: 12px 0 4px;
                border-top: 1px solid var(--border-light);
                margin-top: 8px;
            }
            .site-nav .nav-link {
                padding: 12px 16px;
                border-radius: 8px;
            }
            .site-nav .nav-link::after {
                display: none;
            }
            .site-nav .nav-item.active .nav-link {
                background: rgba(27, 109, 242, .06);
            }
            .nav-actions {
                width: 100%;
                padding: 12px 0 4px;
                justify-content: flex-end;
            }
        }
        @media (max-width: 767.98px) {
            .site-nav {
                min-height: 56px;
            }
            .site-nav .container {
                min-height: 56px;
                padding-top: 4px;
                padding-bottom: 4px;
            }
            .brand-text {
                font-size: 16px;
            }
            .nav-actions .btn-glow {
                padding: 7px 18px;
                font-size: 13px;
            }
            .article-breadcrumb {
                padding: 14px 0;
                font-size: 13px;
            }
            .article-breadcrumb .breadcrumb-current {
                max-width: 160px;
            }
            .article-hero {
                padding: 32px 0 20px;
            }
            .article-title {
                font-size: 26px;
                margin-bottom: 16px;
            }
            .article-section {
                padding: 20px 0 48px;
            }
            .article-body {
                padding: 28px 20px;
                border-radius: 12px;
            }
            .article-content {
                font-size: 16px;
                line-height: 1.8;
            }
            .article-content blockquote {
                padding: 14px 18px;
            }
            .article-pagination {
                flex-direction: column;
                gap: 12px;
            }
            .article-pagination a {
                max-width: 100%;
            }
            .article-pagination a.pull-right {
                margin-left: 0;
            }
            .related-section {
                padding: 48px 0;
            }
            .related-card .card-img-wrap {
                height: 200px;
            }
            .section-head {
                flex-direction: column;
                align-items: flex-start;
                margin-bottom: 24px;
            }
            .article-cta {
                padding: 48px 0;
            }
            .article-cta .btn-outline-glass {
                margin-left: 0;
                margin-top: 12px;
            }
            .site-footer {
                padding-top: 40px;
            }
            .site-footer .row > div {
                margin-bottom: 8px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
                margin-top: 32px;
            }
        }
        @media (min-width: 768px) and (max-width: 991.98px) {
            .article-body {
                padding: 40px 36px;
            }
            .related-card .card-img-wrap {
                height: 160px;
            }
        }

/* roulang page: category1 */
/* ========== 设计变量与基础重置 ========== */
        :root {
            --dark-bg: #081A30;
            --dark-bg-2: #0D2440;
            --primary: #1B6DF2;
            --primary-hover: #1557C4;
            --primary-grad: linear-gradient(135deg, #1B6DF2, #0E5ADB);
            --accent: #00E0B8;
            --accent-hover: #31F0CD;
            --accent-glow: rgba(0, 224, 184, .25);
            --warn: #FF6B4A;
            --light-bg: #F5F8FC;
            --white: #FFFFFF;
            --text-dark: #16233D;
            --text-muted: #5A6B82;
            --text-dark-primary: #EBF2FB;
            --text-dark-secondary: rgba(235, 242, 251, .65);
            --border-light: rgba(22, 35, 61, .08);
            --border-dark: rgba(255, 255, 255, .10);
            --radius-card: 16px;
            --radius-btn: 999px;
            --radius-badge: 6px;
            --radius-input: 10px;
            --radius-img: 14px;
            --shadow-card: 0 8px 30px rgba(22, 35, 61, .06);
            --shadow-glass: 0 12px 40px rgba(4, 17, 36, .35);
            --shadow-primary: 0 0 24px rgba(27, 109, 242, .38);
            --shadow-primary-hover: 0 0 36px rgba(27, 109, 242, .55);
            --transition: .25s ease;
            --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;
            --space-section: 96px;
            --space-section-md: 64px;
            --space-section-sm: 48px;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.625;
            color: var(--text-dark);
            background: var(--light-bg);
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: var(--primary);
            transition: color var(--transition);
        }

        a:hover {
            color: var(--primary-hover);
        }

        img {
            max-width: 100%;
            height: auto;
        }

        button,
        input {
            font-family: inherit;
        }

        .container {
            max-width: 1200px;
        }

        /* ========== 导航 ========== */
        .site-nav {
            background: var(--white);
            min-height: 64px;
            border-bottom: 1px solid var(--border-light);
            box-shadow: 0 4px 20px rgba(10, 30, 60, .06);
            padding: 0;
            z-index: 1030;
        }

        .site-nav .navbar-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-dark);
            padding: 10px 0;
        }

        .site-nav .brand-icon {
            width: 32px;
            height: 32px;
            border-radius: 9px;
            background: linear-gradient(135deg, var(--accent), #00b894);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 14px;
            box-shadow: 0 0 14px var(--accent-glow);
            flex-shrink: 0;
        }

        .site-nav .brand-text {
            font-weight: 700;
            letter-spacing: -.01em;
        }

        .site-nav .navbar-nav {
            gap: 6px;
        }

        .site-nav .nav-item {
            position: relative;
        }

        .site-nav .nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-muted);
            padding: 20px 14px !important;
            transition: color var(--transition);
        }

        .site-nav .nav-link:hover {
            color: var(--primary);
        }

        .site-nav .nav-item.active .nav-link {
            color: var(--primary);
            font-weight: 600;
        }

        .site-nav .nav-item.active .nav-link::after {
            content: '';
            position: absolute;
            bottom: 8px;
            left: 14px;
            right: 14px;
            height: 2px;
            border-radius: 2px;
            background: var(--primary);
        }

        .site-nav .nav-actions {
            display: flex;
            align-items: center;
            gap: 14px;
        }

        .site-nav .nav-search {
            position: relative;
            display: flex;
            align-items: center;
        }

        .site-nav .nav-search i {
            position: absolute;
            left: 12px;
            color: #9AA7B8;
            font-size: 13px;
            pointer-events: none;
        }

        .site-nav .nav-search input {
            width: 200px;
            height: 38px;
            border-radius: 999px;
            border: 1px solid var(--border-light);
            background: var(--light-bg);
            padding: 0 12px 0 34px;
            font-size: 14px;
            color: var(--text-dark);
            transition: all var(--transition);
        }

        .site-nav .nav-search input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(27, 109, 242, .15);
            background: var(--white);
        }

        .site-nav .navbar-toggler {
            border: none;
            color: var(--text-dark);
            font-size: 1.25rem;
            padding: 4px 8px;
        }

        .site-nav .navbar-toggler:focus {
            box-shadow: none;
        }

        /* ========== 按钮 ========== */
        .btn {
            border-radius: var(--radius-btn);
            font-weight: 600;
            padding: 10px 24px;
            transition: all var(--transition);
        }

        .btn-glow {
            background: var(--primary-grad);
            border: none;
            color: #fff;
            box-shadow: var(--shadow-primary);
        }

        .btn-glow:hover {
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-primary-hover);
            background: linear-gradient(135deg, #1F77FF, #1052C8);
        }

        .btn-glow:active {
            transform: translateY(0);
            box-shadow: 0 0 16px rgba(27, 109, 242, .3);
        }

        .btn-outline-light {
            border: 1px solid rgba(255, 255, 255, .45);
            color: #fff;
            background: rgba(255, 255, 255, .08);
            backdrop-filter: blur(8px);
        }

        .btn-outline-light:hover {
            background: rgba(255, 255, 255, .16);
            color: #fff;
            border-color: rgba(255, 255, 255, .7);
        }

        .btn-outline-primary {
            border: 1px solid var(--primary);
            color: var(--primary);
            background: transparent;
        }

        .btn-outline-primary:hover {
            background: var(--primary);
            color: #fff;
        }

        .btn-lg {
            padding: 14px 36px;
            font-size: 1.05rem;
        }

        .btn-sm {
            padding: 7px 18px;
            font-size: 14px;
        }

        /* ========== 分类头图区 ========== */
        .category-hero {
            position: relative;
            min-height: 240px;
            padding: 72px 0 60px;
            background: linear-gradient(145deg, #F5F8FC 0%, #EAF1F8 55%, #E2ECF5 100%);
            overflow: hidden;
        }

        .category-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            opacity: .22;
            pointer-events: none;
        }

        .category-hero::after {
            content: '';
            position: absolute;
            top: -90px;
            right: -60px;
            width: 320px;
            height: 320px;
            background: radial-gradient(circle, rgba(27, 109, 242, .18), transparent 70%);
            pointer-events: none;
        }

        .category-hero .container {
            position: relative;
            z-index: 2;
        }

        .category-hero .section-eyebrow {
            display: inline-block;
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            background: rgba(27, 109, 242, .08);
            padding: 4px 16px;
            border-radius: 999px;
            margin-bottom: 16px;
            letter-spacing: .02em;
        }

        .category-hero h1 {
            font-size: clamp(1.9rem, 4vw, 2.75rem);
            font-weight: 800;
            color: var(--text-dark);
            letter-spacing: -.01em;
            margin-bottom: 14px;
        }

        .category-hero .hero-desc {
            font-size: 1.05rem;
            color: var(--text-muted);
            max-width: 680px;
            margin-bottom: 28px;
            line-height: 1.7;
        }

        .category-hero .hero-actions {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }

        /* ========== 通用板块标题 ========== */
        .section-head {
            text-align: center;
            margin-bottom: 52px;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

        .section-head .section-eyebrow {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            color: var(--primary);
            letter-spacing: .03em;
            text-transform: uppercase;
            margin-bottom: 12px;
            background: rgba(27, 109, 242, .08);
            padding: 4px 16px;
            border-radius: 999px;
        }

        .section-head h2 {
            font-size: clamp(1.5rem, 3vw, 2.1rem);
            font-weight: 700;
            color: var(--text-dark);
            letter-spacing: -.01em;
            margin-bottom: 12px;
        }

        .section-head p {
            color: var(--text-muted);
            font-size: 1rem;
            line-height: 1.7;
        }

        .section-head.light h2 {
            color: var(--text-dark-primary);
        }

        .section-head.light p {
            color: var(--text-dark-secondary);
        }

        .section-head.light .section-eyebrow {
            color: var(--accent);
            background: rgba(0, 224, 184, .1);
        }

        /* ========== 图文交错层 ========== */
        .feature-showcase {
            background: var(--white);
            padding: var(--space-section) 0;
        }

        .showcase-row {
            margin-bottom: 72px;
        }

        .showcase-row:last-child {
            margin-bottom: 0;
        }

        .showcase-img {
            width: 100%;
            height: 380px;
            object-fit: cover;
            border-radius: var(--radius-img);
            box-shadow: var(--shadow-card);
            transition: transform .35s ease, box-shadow .35s ease;
        }

        .showcase-img:hover {
            transform: scale(1.015);
            box-shadow: 0 12px 36px rgba(22, 35, 61, .1);
        }

        .showcase-row h3 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 16px;
        }

        .showcase-row p {
            color: var(--text-muted);
            font-size: 1rem;
            line-height: 1.8;
            margin-bottom: 20px;
        }

        .showcase-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .showcase-list li {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 8px 0;
            font-size: 15px;
            color: var(--text-dark);
        }

        .showcase-list li i {
            color: var(--accent);
            font-size: 18px;
            text-shadow: 0 0 8px var(--accent-glow);
        }

        /* ========== 两列大特性卡（深色） ========== */
        .core-features {
            position: relative;
            padding: var(--space-section) 0;
            background: linear-gradient(145deg, var(--dark-bg), var(--dark-bg-2));
            overflow: hidden;
        }

        .core-features::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
            opacity: .08;
            pointer-events: none;
        }

        .core-features::after {
            content: '';
            position: absolute;
            top: -80px;
            left: 20%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(0, 224, 184, .12), transparent 70%);
            pointer-events: none;
        }

        .core-features .container {
            position: relative;
            z-index: 1;
        }

        .feature-card {
            padding: 32px;
            border-radius: var(--radius-card);
            height: 100%;
            transition: all var(--transition);
        }

        .feature-card:hover {
            transform: translateY(-4px);
            border-color: rgba(255, 255, 255, .2);
        }

        .glass-card {
            background: rgba(255, 255, 255, .055);
            backdrop-filter: blur(16px) saturate(140%);
            -webkit-backdrop-filter: blur(16px) saturate(140%);
            border: 1px solid rgba(255, 255, 255, .12);
            box-shadow: inset 0 1px 0 rgba(255, 255, 255, .12), var(--shadow-glass);
        }

        .feature-icon {
            width: 52px;
            height: 52px;
            border-radius: 12px;
            background: linear-gradient(135deg, var(--accent), #00b894);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: #fff;
            box-shadow: 0 0 18px var(--accent-glow);
            margin-bottom: 20px;
        }

        .feature-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--text-dark-primary);
            margin-bottom: 12px;
        }

        .feature-card p {
            color: var(--text-dark-secondary);
            font-size: 15px;
            line-height: 1.75;
            margin-bottom: 0;
        }

        /* ========== 适用场景 ========== */
        .use-cases {
            padding: var(--space-section) 0;
            background: var(--light-bg);
        }

        .use-case-card {
            background: var(--white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-card);
            padding: 0 0 24px;
            height: 100%;
            box-shadow: var(--shadow-card);
            transition: all var(--transition);
            overflow: hidden;
        }

        .use-case-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 32px rgba(22, 35, 61, .08);
        }

        .use-case-img {
            height: 180px;
            overflow: hidden;
            margin-bottom: 20px;
        }

        .use-case-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .4s ease;
        }

        .use-case-card:hover .use-case-img img {
            transform: scale(1.04);
        }

        .case-tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            color: var(--primary);
            background: rgba(27, 109, 242, .08);
            padding: 3px 12px;
            border-radius: 999px;
            margin: 0 24px 10px;
        }

        .use-case-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-dark);
            padding: 0 24px;
            margin-bottom: 8px;
        }

        .use-case-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            padding: 0 24px;
            margin-bottom: 0;
        }

        /* ========== 服务流程（深色） ========== */
        .service-process {
            position: relative;
            padding: var(--space-section) 0;
            background: linear-gradient(145deg, var(--dark-bg-2), var(--dark-bg));
            overflow: hidden;
        }

        .service-process::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center/cover no-repeat;
            opacity: .07;
            pointer-events: none;
        }

        .service-process .container {
            position: relative;
            z-index: 1;
        }

        .process-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .process-step {
            text-align: center;
            padding: 32px 20px;
            border-radius: var(--radius-card);
            background: rgba(255, 255, 255, .04);
            border: 1px solid rgba(255, 255, 255, .08);
            transition: all var(--transition);
        }

        .process-step:hover {
            background: rgba(255, 255, 255, .07);
            border-color: rgba(0, 224, 184, .3);
            transform: translateY(-4px);
        }

        .step-num {
            display: inline-block;
            font-size: 1.6rem;
            font-weight: 800;
            color: transparent;
            -webkit-text-stroke: 1px var(--accent);
            margin-bottom: 14px;
            letter-spacing: -.02em;
        }

        .process-step h3 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-dark-primary);
            margin-bottom: 10px;
        }

        .process-step p {
            font-size: 14px;
            color: var(--text-dark-secondary);
            line-height: 1.7;
            margin-bottom: 0;
        }

        /* ========== 相关服务入口 ========== */
        .related-services {
            padding: var(--space-section) 0;
            background: var(--white);
        }

        .related-card {
            display: block;
            background: var(--light-bg);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-card);
            padding: 32px 28px;
            height: 100%;
            transition: all var(--transition);
        }

        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 30px rgba(22, 35, 61, .08);
            border-color: rgba(27, 109, 242, .25);
        }

        .related-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: linear-gradient(135deg, rgba(27, 109, 242, .12), rgba(0, 224, 184, .12));
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: var(--primary);
            margin-bottom: 18px;
        }

        .related-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 10px;
        }

        .related-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 16px;
        }

        .related-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: gap var(--transition);
        }

        .related-card:hover .related-link {
            gap: 10px;
        }

        /* ========== FAQ ========== */
        .faq-section {
            padding: var(--space-section) 0;
            background: var(--light-bg);
        }

        .faq-accordion {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-accordion .accordion-item {
            background: var(--white);
            border: 1px solid var(--border-light);
            border-radius: 20px !important;
            margin-bottom: 14px;
            overflow: hidden;
            box-shadow: 0 2px 12px rgba(22, 35, 61, .03);
        }

        .faq-accordion .accordion-button {
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-dark);
            background: var(--white);
            padding: 16px 24px;
            min-height: 48px;
            border: none;
            box-shadow: none;
        }

        .faq-accordion .accordion-button:not(.collapsed) {
            color: var(--primary);
            background: var(--white);
            box-shadow: none;
        }

        .faq-accordion .accordion-button:focus {
            box-shadow: none;
            border-color: transparent;
        }

        .faq-accordion .accordion-button::after {
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            content: '\f067';
            background-image: none;
            font-size: 1rem;
            color: var(--primary);
            transition: transform .2s ease;
            width: 24px;
            height: 24px;
        }

        .faq-accordion .accordion-button:not(.collapsed)::after {
            transform: rotate(45deg);
            content: '\f067';
        }

        .faq-accordion .accordion-body {
            padding: 8px 24px 24px;
            color: var(--text-muted);
            font-size: 15px;
            line-height: 1.75;
            border-top: 1px solid var(--border-light);
        }

        /* ========== CTA ========== */
        .cta-section {
            position: relative;
            padding: 84px 0;
            background: linear-gradient(145deg, var(--dark-bg), var(--dark-bg-2));
            text-align: center;
            overflow: hidden;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            opacity: .08;
            pointer-events: none;
        }

        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -100px;
            left: 50%;
            transform: translateX(-50%);
            width: 500px;
            height: 300px;
            background: radial-gradient(circle, rgba(27, 109, 242, .25), transparent 70%);
            pointer-events: none;
        }

        .cta-section .container {
            position: relative;
            z-index: 1;
        }

        .cta-section h2 {
            font-size: clamp(1.6rem, 3.5vw, 2.4rem);
            font-weight: 800;
            color: var(--text-dark-primary);
            letter-spacing: -.01em;
            margin-bottom: 14px;
        }

        .cta-section p {
            font-size: 1.05rem;
            color: var(--text-dark-secondary);
            max-width: 560px;
            margin: 0 auto 32px;
            line-height: 1.7;
        }

        .cta-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* ========== 页脚 ========== */
        .site-footer {
            background: #050E1C;
            color: rgba(255, 255, 255, .7);
            padding: 64px 0 0;
            font-size: 14px;
        }

        .site-footer .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-dark-primary);
            margin-bottom: 14px;
        }

        .site-footer .footer-brand .brand-icon {
            width: 32px;
            height: 32px;
            border-radius: 9px;
            background: linear-gradient(135deg, var(--accent), #00b894);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 14px;
            box-shadow: 0 0 14px var(--accent-glow);
        }

        .site-footer p {
            font-size: 14px;
            line-height: 1.7;
            color: rgba(255, 255, 255, .55);
        }

        .site-footer h4 {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-dark-primary);
            margin-bottom: 18px;
        }

        .site-footer ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .site-footer ul li {
            margin-bottom: 10px;
        }

        .site-footer ul li a {
            color: rgba(255, 255, 255, .6);
            font-size: 14px;
            transition: color var(--transition);
        }

        .site-footer ul li a:hover {
            color: var(--accent);
        }

        .site-footer ul li i {
            margin-right: 8px;
            color: var(--accent);
            font-size: 13px;
        }

        .social-icons {
            display: flex;
            gap: 10px;
            margin-top: 18px;
        }

        .social-icons a {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: rgba(255, 255, 255, .06);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: rgba(255, 255, 255, .7);
            font-size: 14px;
            transition: all var(--transition);
        }

        .social-icons a:hover {
            background: var(--accent);
            color: #fff;
            transform: translateY(-2px);
        }

        .footer-bottom {
            margin-top: 48px;
            padding: 20px 0;
            border-top: 1px solid var(--border-dark);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
        }

        .footer-bottom p {
            margin: 0;
            font-size: 13px;
            color: rgba(255, 255, 255, .4);
        }

        /* ========== 响应式 ========== */
        @media (max-width: 991px) {
            :root {
                --space-section: 64px;
            }

            .site-nav .nav-link {
                padding: 12px 0 !important;
            }

            .site-nav .nav-item.active .nav-link::after {
                display: none;
            }

            .site-nav .nav-actions {
                padding: 8px 0 20px;
                flex-wrap: wrap;
            }

            .site-nav .nav-search input {
                width: 100%;
            }

            .process-steps {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 767px) {
            :root {
                --space-section: 48px;
            }

            .site-nav {
                min-height: 56px;
            }

            .site-nav .navbar-brand {
                font-size: 1rem;
            }

            .category-hero {
                padding: 52px 0 44px;
            }

            .category-hero .hero-desc {
                font-size: 15px;
            }

            .showcase-row {
                margin-bottom: 48px;
            }

            .showcase-img {
                height: 240px;
                margin-bottom: 20px;
            }

            .process-steps {
                grid-template-columns: 1fr;
            }

            .feature-card {
                padding: 24px;
            }

            .use-case-card {
                margin-bottom: 12px;
            }

            .cta-section {
                padding: 56px 0;
            }

            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 520px) {
            .site-nav .nav-search {
                width: 100%;
            }

            .hero-actions .btn {
                width: 100%;
            }

            .cta-actions .btn {
                width: 100%;
                margin: 0;
            }

            .category-hero h1 {
                font-size: 1.7rem;
            }
        }

/* roulang page: category3 */
:root {
  --primary: #1B6DF2;
  --primary-dark: #1557C4;
  --accent: #00E0B8;
  --accent-hover: #31F0CD;
  --danger: #FF6B4A;
  --deep-bg: #081A30;
  --deep-bg-alt: #0D2440;
  --light-bg: #F5F8FC;
  --card-bg: #FFFFFF;
  --text-dark: #16233D;
  --text-dark-muted: #5A6B82;
  --text-footer: #EBF2FB;
  --text-footer-muted: rgba(235, 242, 251, .65);
  --border-light: rgba(22, 35, 61, .08);
  --border-deep: rgba(255, 255, 255, .10);
  --radius-card: 16px;
  --radius-btn: 999px;
  --radius-badge: 6px;
  --radius-input: 10px;
  --radius-img: 14px;
  --shadow-card: 0 8px 30px rgba(22, 35, 61, .06);
  --shadow-glass: 0 12px 40px rgba(4, 17, 36, .35);
  --transition-fast: .2s ease;
  --transition-normal: .25s ease;
  --transition-slow: .35s ease;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;
  line-height: 1.625;
  color: var(--text-dark);
  background: var(--light-bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: var(--primary);
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--primary-dark);
}

img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-img);
}

button, input, select, textarea {
  font-family: inherit;
}

.container {
  max-width: 1200px;
}

/* ===== 导航 ===== */
.site-nav {
  background: #FFFFFF;
  min-height: 64px;
  padding: 0;
  border-bottom: 1px solid rgba(10, 30, 60, .08);
  box-shadow: 0 4px 20px rgba(10, 30, 60, .06);
  position: sticky;
  top: 0;
  z-index: 1040;
}

.site-nav .navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0;
  margin: 0 20px 0 0;
}

.site-nav .brand-icon {
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, #00E0B8, #00B99A);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 14px;
  box-shadow: 0 0 14px rgba(0, 224, 184, .35);
  flex-shrink: 0;
}

.site-nav .brand-text {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-dark);
  letter-spacing: .01em;
  line-height: 1.2;
}

.site-nav .navbar-nav {
  gap: 4px;
}

.site-nav .nav-link {
  font-size: .9rem;
  font-weight: 500;
  color: var(--text-dark-muted);
  padding: 8px 16px;
  border-radius: var(--radius-btn);
  transition: all var(--transition-fast);
  position: relative;
}

.site-nav .nav-link::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
  transform: translateX(-50%);
  transition: width var(--transition-fast);
}

.site-nav .nav-link:hover {
  color: var(--primary);
}

.site-nav .nav-link:hover::after {
  width: 24px;
}

.site-nav .nav-item.active .nav-link {
  color: var(--primary);
  font-weight: 600;
}

.site-nav .nav-item.active .nav-link::after {
  width: 28px;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.nav-search {
  position: relative;
  display: flex;
  align-items: center;
}

.nav-search i {
  position: absolute;
  left: 14px;
  font-size: 13px;
  color: #9DAEC2;
  pointer-events: none;
  z-index: 2;
}

.nav-search input {
  width: 200px;
  height: 38px;
  border: 1px solid rgba(22, 35, 61, .12);
  border-radius: var(--radius-btn);
  padding: 0 16px 0 38px;
  font-size: .85rem;
  background: var(--light-bg);
  color: var(--text-dark);
  outline: none;
  transition: all var(--transition-fast);
}

.nav-search input:focus {
  border-color: var(--primary);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(27, 109, 242, .12);
}

.nav-actions .btn {
  border-radius: var(--radius-btn);
  font-size: .85rem;
  font-weight: 500;
  padding: 8px 20px;
  white-space: nowrap;
}

.site-nav .navbar-toggler {
  border: none;
  font-size: 1.2rem;
  color: var(--text-dark);
  padding: 4px 8px;
  outline: none;
}

.site-nav .navbar-toggler:focus {
  box-shadow: none;
}

/* ===== 按钮 ===== */
.btn-glow {
  background: linear-gradient(135deg, #1B6DF2, #0E5ADB);
  border: none;
  color: #fff;
  box-shadow: 0 0 24px rgba(27, 109, 242, .38);
  transition: all var(--transition-normal);
  border-radius: var(--radius-btn);
  font-weight: 500;
}

.btn-glow:hover {
  background: linear-gradient(135deg, #2A7AFF, #1557C4);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 0 36px rgba(27, 109, 242, .5);
}

.btn-glow:active {
  transform: translateY(1px);
  box-shadow: 0 0 18px rgba(27, 109, 242, .3);
}

.btn-outline-glass {
  background: rgba(255, 255, 255, .08);
  border: 1px solid rgba(255, 255, 255, .22);
  color: var(--text-footer);
  border-radius: var(--radius-btn);
  font-weight: 500;
  transition: all var(--transition-normal);
}

.btn-outline-glass:hover {
  background: rgba(255, 255, 255, .14);
  border-color: rgba(255, 255, 255, .35);
  color: #fff;
  transform: translateY(-2px);
}

.btn-outline-glass:active {
  transform: translateY(0);
}

.btn-ghost-light {
  background: rgba(255, 255, 255, .1);
  border: none;
  color: var(--text-footer);
  border-radius: var(--radius-btn);
  font-weight: 500;
  transition: all var(--transition-fast);
}

.btn-ghost-light:hover {
  background: rgba(255, 255, 255, .18);
  color: #fff;
}

/* ===== 分类 Hero ===== */
.cat-hero {
  position: relative;
  min-height: 240px;
  padding: 72px 0 64px;
  background:
    linear-gradient(145deg, rgba(8, 26, 48, .96), rgba(13, 36, 64, .92)),
    url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  color: var(--text-footer);
  overflow: hidden;
  display: flex;
  align-items: center;
}

.cat-hero::before {
  content: '';
  position: absolute;
  top: -80px;
  right: -60px;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(0, 224, 184, .15), transparent 70%);
  pointer-events: none;
}

.cat-hero::after {
  content: '';
  position: absolute;
  bottom: -40px;
  left: -40px;
  width: 260px;
  height: 260px;
  background: radial-gradient(circle, rgba(27, 109, 242, .18), transparent 70%);
  pointer-events: none;
}

.cat-hero .container {
  position: relative;
  z-index: 1;
}

.cat-hero .cat-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 224, 184, .15);
  color: var(--accent);
  border: 1px solid rgba(0, 224, 184, .3);
  border-radius: var(--radius-badge);
  padding: 4px 14px;
  font-size: .8rem;
  font-weight: 500;
  margin-bottom: 20px;
}

.cat-hero h1 {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.25;
  margin-bottom: 14px;
  letter-spacing: -.01em;
}

.cat-hero .cat-sub {
  font-size: 1rem;
  color: var(--text-footer-muted);
  max-width: 640px;
  line-height: 1.8;
  margin-bottom: 0;
}

/* ===== 通用板块 ===== */
.section-block {
  padding: 72px 0;
}

.section-block { background: #fff; }
.section-block-alt { background: var(--light-bg); }
.section-block-dark { background: var(--deep-bg); }

.section-head {
  margin-bottom: 44px;
  max-width: 680px;
}

.section-head .sec-tag {
  color: var(--primary);
  font-size: .8125rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  margin-bottom: 8px;
  display: inline-block;
}

.section-head h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  color: var(--text-dark);
  line-height: 1.3;
  margin-bottom: 12px;
  letter-spacing: -.01em;
}

.section-head p {
  color: var(--text-dark-muted);
  font-size: .95rem;
  line-height: 1.75;
}

.section-block-dark .section-head .sec-tag {
  color: var(--accent);
}

.section-block-dark .section-head h2 {
  color: #fff;
}

.section-block-dark .section-head p {
  color: var(--text-footer-muted);
}

/* ===== 流程步骤 ===== */
.steps-wrap {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.step-card {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  background: #fff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  padding: 24px 28px;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.step-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 36px rgba(22, 35, 61, .1);
}

.step-num {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(27, 109, 242, .15), rgba(0, 224, 184, .12));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--primary);
  flex-shrink: 0;
}

.step-content h4 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 6px;
}

.step-content p {
  font-size: .9rem;
  color: var(--text-dark-muted);
  line-height: 1.7;
  margin-bottom: 0;
}

/* ===== 特性卡片 ===== */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.feature-card {
  background: #fff;
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  padding: 32px 30px;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(22, 35, 61, .1);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(27, 109, 242, .12), rgba(0, 224, 184, .1));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--primary);
  margin-bottom: 20px;
}

.feature-card h4 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 10px;
}

.feature-card p {
  font-size: .9rem;
  color: var(--text-dark-muted);
  line-height: 1.7;
  margin-bottom: 0;
}

/* ===== 图文场景 ===== */
.scene-row {
  display: flex;
  align-items: center;
  gap: 48px;
  margin-bottom: 64px;
}

.scene-row:last-child {
  margin-bottom: 0;
}

.scene-row.reverse {
  flex-direction: row-reverse;
}

.scene-img {
  flex: 0 0 48%;
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-card);
  box-shadow: 0 16px 48px rgba(22, 35, 61, .08);
}

.scene-img img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  display: block;
  transition: transform var(--transition-slow);
}

.scene-img:hover img {
  transform: scale(1.03);
}

.scene-tag {
  position: absolute;
  bottom: 16px;
  right: 16px;
  background: rgba(8, 26, 48, .85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: #fff;
  padding: 6px 16px;
  border-radius: var(--radius-btn);
  font-size: .8rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid rgba(255, 255, 255, .15);
}

.scene-content h3 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 14px;
  letter-spacing: -.01em;
}

.scene-content p {
  font-size: .95rem;
  color: var(--text-dark-muted);
  line-height: 1.8;
  margin-bottom: 16px;
}

.scene-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.scene-list li {
  position: relative;
  padding-left: 22px;
  font-size: .9rem;
  color: var(--text-dark-muted);
  margin-bottom: 10px;
  line-height: 1.6;
}

.scene-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
}

/* ===== FAQ 手风琴 ===== */
.faq-wrap {
  max-width: 900px;
  margin: 0 auto;
}

.faq-item {
  background: #fff;
  border: 1px solid var(--border-light);
  border-radius: 16px;
  margin-bottom: 16px;
  box-shadow: 0 4px 20px rgba(22, 35, 61, .04);
  overflow: hidden;
  transition: box-shadow var(--transition-fast);
}

.faq-item:hover {
  box-shadow: 0 8px 30px rgba(22, 35, 61, .08);
}

.faq-item.active {
  box-shadow: 0 8px 30px rgba(27, 109, 242, .1);
  border-color: rgba(27, 109, 242, .25);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  cursor: pointer;
  min-height: 48px;
  user-select: none;
  gap: 20px;
}

.faq-question h4 {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-dark);
  margin-bottom: 0;
  line-height: 1.5;
}

.faq-icon {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--light-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .8rem;
  color: var(--primary);
  transition: all var(--transition-normal);
  flex-shrink: 0;
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
  background: var(--primary);
  color: #fff;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal);
}

.faq-answer-inner {
  padding: 0 24px 20px;
}

.faq-answer-inner p {
  font-size: .92rem;
  color: var(--text-dark-muted);
  line-height: 1.8;
  margin-bottom: 0;
}

/* ===== CTA 区 ===== */
.cta-section {
  background: var(--deep-bg);
  padding: 72px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
  opacity: .12;
  pointer-events: none;
}

.cta-section .container {
  position: relative;
  z-index: 1;
}

.cta-section h2 {
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
  letter-spacing: -.01em;
}

.cta-section p {
  color: var(--text-footer-muted);
  font-size: .95rem;
  margin-bottom: 28px;
  line-height: 1.7;
}

.cta-section .btn {
  padding: 12px 36px;
  font-size: 1rem;
}

/* ===== 页脚 ===== */
.site-footer {
  background: #050E1C;
  color: var(--text-footer-muted);
  padding: 64px 0 0;
  font-size: .88rem;
}

.site-footer .footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}

.site-footer .brand-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, #00E0B8, #00B99A);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 16px;
  box-shadow: 0 0 16px rgba(0, 224, 184, .3);
}

.site-footer p {
  font-size: .88rem;
  line-height: 1.8;
  margin-bottom: 20px;
  color: var(--text-footer-muted);
}

.site-footer h4 {
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.site-footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.site-footer ul li {
  margin-bottom: 10px;
}

.site-footer ul li a {
  color: var(--text-footer-muted);
  font-size: .85rem;
  transition: color var(--transition-fast);
}

.site-footer ul li a:hover {
  color: var(--accent);
}

.site-footer ul li i {
  width: 20px;
  color: var(--accent);
  font-size: .8rem;
}

.social-icons {
  display: flex;
  gap: 12px;
  margin-top: 18px;
}

.social-icons a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, .06);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-footer-muted);
  font-size: .9rem;
  border: 1px solid rgba(255, 255, 255, .08);
  transition: all var(--transition-normal);
}

.social-icons a:hover {
  background: var(--accent);
  color: #050E1C;
  border-color: var(--accent);
  transform: translateY(-3px);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, .08);
  padding: 20px 0;
  margin-top: 48px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p {
  margin-bottom: 0;
  font-size: .82rem;
}

/* ===== 固定转化条 ===== */
.cta-sticky {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 64px;
  background: rgba(8, 26, 48, .85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  z-index: 1050;
  display: flex;
  align-items: center;
  border-top: 1px solid rgba(255, 255, 255, .1);
  transform: translateY(0);
  transition: transform var(--transition-normal);
}

.cta-sticky.hidden {
  transform: translateY(100%);
}

.cta-sticky .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.cta-sticky .sticky-text {
  color: #fff;
  font-size: .9rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 60%;
}

.cta-sticky .btn {
  padding: 9px 26px;
  font-size: .85rem;
  border-radius: var(--radius-btn);
  white-space: nowrap;
}

.cta-sticky .sticky-close {
  background: none;
  border: none;
  color: rgba(255, 255, 255, .6);
  font-size: 1.1rem;
  cursor: pointer;
  line-height: 1;
  padding: 4px;
  transition: color var(--transition-fast);
}

.cta-sticky .sticky-close:hover {
  color: #fff;
}

body.has-sticky {
  padding-bottom: 80px;
}

/* ===== 响应式 ===== */
@media (max-width: 992px) {
  .site-nav .container {
    max-width: 100%;
    padding: 0 16px;
  }
  
  .site-nav .navbar-brand {
    margin-right: 8px;
  }
  
  .nav-search input {
    width: 160px;
  }
  
  .feature-grid {
    gap: 16px;
  }
  
  .scene-row {
    gap: 32px;
  }
  
  .scene-img img {
    height: 240px;
  }
}

@media (max-width: 768px) {
  body {
    font-size: 15px;
  }
  
  .site-nav {
    min-height: 56px;
  }
  
  .site-nav .container {
    padding: 0 12px;
  }
  
  .site-nav .navbar-brand {
    margin: 0;
  }
  
  .site-nav .brand-text {
    font-size: 1.05rem;
  }
  
  .site-nav .navbar-collapse {
    background: #fff;
    border-radius: 12px;
    padding: 16px;
    margin-top: 12px;
    box-shadow: 0 16px 48px rgba(10, 30, 60, .15);
    border: 1px solid var(--border-light);
  }
  
  .site-nav .navbar-nav {
    gap: 2px;
    margin-bottom: 12px;
  }
  
  .site-nav .nav-link {
    padding: 10px 14px;
    border-radius: 8px;
  }
  
  .site-nav .nav-link::after {
    display: none;
  }
  
  .site-nav .nav-item.active .nav-link {
    background: rgba(27, 109, 242, .08);
  }
  
  .nav-actions {
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }
  
  .nav-search input {
    width: 100%;
  }
  
  .nav-actions .btn {
    width: 100%;
  }
  
  .cat-hero {
    min-height: auto;
    padding: 56px 0 48px;
  }
  
  .cat-hero h1 {
    font-size: 1.6rem;
  }
  
  .section-block {
    padding: 48px 0;
  }
  
  .feature-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  
  .feature-card {
    padding: 24px 20px;
  }
  
  .scene-row {
    flex-direction: column;
    gap: 24px;
    margin-bottom: 36px;
  }
  
  .scene-row.reverse {
    flex-direction: column;
  }
  
  .scene-img {
    flex: 0 0 auto;
    width: 100%;
  }
  
  .scene-img img {
    height: 200px;
  }
  
  .step-card {
    padding: 20px;
    gap: 14px;
  }
  
  .step-num {
    width: 40px;
    height: 40px;
    font-size: 1rem;
    border-radius: 10px;
  }
  
  .faq-question {
    padding: 14px 18px;
  }
  
  .faq-answer-inner {
    padding: 0 18px 16px;
  }
  
  .cta-section {
    padding: 48px 0;
  }
  
  .cta-section .btn {
    width: 100%;
  }
  
  .cta-sticky .container {
    padding: 0 16px;
  }
  
  .cta-sticky .sticky-text {
    font-size: .82rem;
  }
  
  .footer-bottom {
    flex-direction: column;
    text-align: center;
    gap: 6px;
  }
}

@media (max-width: 520px) {
  .cat-hero .cat-sub {
    font-size: .9rem;
  }
  
  .scene-img img {
    height: 180px;
  }
  
  .section-head h2 {
    font-size: 1.35rem;
  }
  
  .cta-sticky .sticky-text {
    max-width: 50%;
    font-size: .78rem;
  }
}

/* ===== 通用 / 各版块色块 ===== */
.bg-purple-blob {
  background:
    radial-gradient(circle at 15% 25%, rgba(27, 109, 242, .08), transparent 40%),
    radial-gradient(circle at 85% 70%, rgba(0, 224, 184, .06), transparent 40%),
    var(--light-bg);
}

.text-muted-custom {
  color: var(--text-dark-muted);
}

/* roulang page: category2 */
:root {
            --primary: #1B6DF2;
            --primary-dark: #1557C4;
            --primary-light: #4A8DF0;
            --energy: #00E0B8;
            --energy-hover: #31F0CD;
            --warning: #FF6B4A;
            --deep-bg-start: #081A30;
            --deep-bg-end: #0D2440;
            --light-bg: #F5F8FC;
            --white: #FFFFFF;
            --dark-text: #16233D;
            --muted-text: #5A6B82;
            --dark-main-text: #EBF2FB;
            --dark-sub-text: rgba(235, 242, 251, .65);
            --border-light: rgba(22, 35, 61, .08);
            --border-dark: rgba(255, 255, 255, .10);
            --radius-card: 16px;
            --radius-btn: 999px;
            --radius-badge: 6px;
            --radius-input: 10px;
            --shadow-glass: 0 12px 40px rgba(4, 17, 36, .35);
            --shadow-card: 0 8px 30px rgba(22, 35, 61, .06);
            --transition: all .25s ease;
            --font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;
        }

        /* ===== Reset / Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.625;
            color: var(--dark-text);
            background: var(--white);
            -webkit-font-smoothing: antialiased;
        }

        a {
            text-decoration: none;
            color: var(--primary);
            transition: var(--transition);
        }

        a:hover {
            color: var(--primary-dark);
        }

        img {
            max-width: 100%;
            display: block;
        }

        button,
        input {
            font-family: inherit;
        }

        .container {
            max-width: 1200px;
        }

        /* ===== 导航 ===== */
        .site-nav {
            background: var(--white);
            min-height: 64px;
            padding: 0;
            border-bottom: 1px solid rgba(22, 35, 61, .06);
            box-shadow: 0 4px 20px rgba(10, 30, 60, .06);
        }

        .site-nav .container {
            position: relative;
        }

        .site-nav .navbar-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 12px 0;
            color: var(--dark-text);
            font-weight: 800;
            font-size: 1.15rem;
            letter-spacing: -0.01em;
        }

        .site-nav .navbar-brand:hover {
            color: var(--primary);
        }

        .brand-icon {
            width: 32px;
            height: 32px;
            min-width: 32px;
            border-radius: 9px;
            background: linear-gradient(135deg, #00E0B8, #1B6DF2);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 14px;
            box-shadow: 0 0 14px rgba(0, 224, 184, .35);
        }

        .brand-text {
            font-weight: 800;
        }

        .site-nav .navbar-toggler {
            border: none;
            color: var(--dark-text);
            font-size: 1.25rem;
            padding: 4px 10px;
            box-shadow: none;
        }

        .site-nav .navbar-toggler:focus {
            box-shadow: 0 0 0 3px rgba(27, 109, 242, .25);
        }

        .site-nav .navbar-nav {
            gap: 6px;
        }

        .site-nav .nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--dark-text);
            padding: 20px 12px !important;
            position: relative;
            transition: color .2s ease;
        }

        .site-nav .nav-link::after {
            content: "";
            position: absolute;
            left: 12px;
            right: 12px;
            bottom: 10px;
            height: 2px;
            border-radius: 4px;
            background: var(--energy);
            transform: scaleX(0);
            transform-origin: center;
            transition: transform .25s ease;
        }

        .site-nav .nav-link:hover {
            color: var(--primary);
        }

        .site-nav .nav-link:hover::after {
            transform: scaleX(1);
        }

        .site-nav .nav-item.active .nav-link {
            color: var(--primary);
            font-weight: 600;
        }

        .site-nav .nav-item.active .nav-link::after {
            transform: scaleX(1);
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 14px;
        }

        .nav-search {
            display: flex;
            align-items: center;
            background: #F0F4FA;
            border-radius: 999px;
            padding: 0 16px;
            width: 200px;
            height: 38px;
            transition: all .25s ease;
            border: 1px solid transparent;
        }

        .nav-search:focus-within {
            background: #fff;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(27, 109, 242, .15);
        }

        .nav-search i {
            font-size: 13px;
            color: var(--muted-text);
            margin-right: 8px;
        }

        .nav-search input {
            border: none;
            background: transparent;
            outline: none;
            font-size: 13px;
            width: 100%;
            color: var(--dark-text);
        }

        .nav-search input::placeholder {
            color: #8A97AC;
        }

        .btn-glow {
            background: linear-gradient(135deg, var(--primary), #0E5ADB);
            border: none;
            color: #fff !important;
            border-radius: 999px;
            padding: 8px 22px;
            font-weight: 600;
            font-size: 14px;
            box-shadow: 0 0 24px rgba(27, 109, 242, .35);
            transition: all .25s ease;
        }

        .btn-glow:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 36px rgba(27, 109, 242, .5);
            color: #fff;
        }

        .btn-glow:active {
            transform: translateY(-1px);
        }

        /* ===== 分类页 Hero ===== */
        .category-hero {
            position: relative;
            min-height: 300px;
            background: linear-gradient(145deg, #0D2440 0%, #081A30 65%, #0A1F3A 100%);
            display: flex;
            align-items: center;
            padding: 72px 0 64px;
            overflow: hidden;
        }

        .category-hero::before {
            content: "";
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            opacity: .25;
            z-index: 1;
        }

        .category-hero::after {
            content: "";
            position: absolute;
            inset: 0;
            background-image: radial-gradient(rgba(255,255,255,.08) 1px, transparent 1px);
            background-size: 32px 32px;
            opacity: .3;
            z-index: 2;
        }

        .category-hero .container {
            position: relative;
            z-index: 3;
        }

        .breadcrumb-line {
            font-size: 13px;
            color: rgba(235, 242, 251, .55);
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .breadcrumb-line a {
            color: rgba(235, 242, 251, .75);
            text-decoration: none;
        }

        .breadcrumb-line a:hover {
            color: var(--energy);
        }

        .breadcrumb-line i {
            font-size: 10px;
            color: rgba(235, 242, 251, .35);
        }

        .category-hero h1 {
            font-size: clamp(2rem, 4vw, 2.75rem);
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 14px;
            letter-spacing: -0.01em;
        }

        .category-desc {
            font-size: 1rem;
            line-height: 1.8;
            color: rgba(235, 242, 251, .75);
            max-width: 760px;
            margin-bottom: 22px;
        }

        .hero-badges {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
        }

        .badge-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, .08);
            backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, .12);
            padding: 8px 18px;
            border-radius: 999px;
            font-size: 13px;
            font-weight: 500;
            color: #EBF2FB;
            transition: var(--transition);
        }

        .badge-tag:hover {
            background: rgba(255, 255, 255, .14);
            transform: translateY(-2px);
        }

        .badge-tag i {
            color: var(--energy);
            font-size: 14px;
        }

        /* ===== 通用 Section ===== */
        .section {
            padding: 96px 0;
        }

        .section.alt-section {
            background: var(--light-bg);
        }

        .section-head {
            max-width: 700px;
            margin: 0 auto 56px;
        }

        .section-eyebrow {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: .8125rem;
            font-weight: 600;
            color: var(--primary);
            letter-spacing: .04em;
            text-transform: uppercase;
            margin-bottom: 10px;
        }

        .section-eyebrow::before {
            content: "";
            width: 24px;
            height: 2px;
            background: var(--energy);
            border-radius: 4px;
            display: inline-block;
        }

        .section-head h2 {
            font-size: clamp(1.5rem, 3vw, 2.25rem);
            font-weight: 700;
            color: var(--dark-text);
            line-height: 1.3;
            margin-bottom: 14px;
            letter-spacing: -0.01em;
        }

        .section-head p {
            color: var(--muted-text);
            font-size: .95rem;
            line-height: 1.7;
        }

        /* ===== 场景卡片 ===== */
        .scene-card {
            background: var(--white);
            border: 1px solid rgba(22, 35, 61, .06);
            border-radius: 20px;
            padding: 32px 28px;
            height: 100%;
            transition: var(--transition);
            box-shadow: 0 4px 16px rgba(22, 35, 61, .04);
            position: relative;
            overflow: hidden;
        }

        .scene-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--energy));
            opacity: 0;
            transition: var(--transition);
        }

        .scene-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 12px 40px rgba(22, 35, 61, .08);
            border-color: rgba(27, 109, 242, .2);
        }

        .scene-card:hover::before {
            opacity: 1;
        }

        .scene-icon {
            width: 52px;
            height: 52px;
            border-radius: 14px;
            background: linear-gradient(135deg, rgba(27, 109, 242, .1), rgba(0, 224, 184, .1));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--primary);
            margin-bottom: 20px;
            transition: var(--transition);
        }

        .scene-card:hover .scene-icon {
            background: linear-gradient(135deg, var(--primary), var(--energy));
            color: #fff;
            box-shadow: 0 0 20px rgba(0, 224, 184, .3);
        }

        .scene-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--dark-text);
            margin-bottom: 10px;
        }

        .scene-card p {
            font-size: .9rem;
            line-height: 1.7;
            color: var(--muted-text);
            margin-bottom: 0;
        }

        /* ===== 图文交错 ===== */
        .image-card {
            position: relative;
            border-radius: 20px;
            overflow: hidden;
            box-shadow: 0 16px 48px rgba(22, 35, 61, .14);
            transition: var(--transition);
        }

        .image-card img {
            width: 100%;
            height: 360px;
            object-fit: cover;
            transition: transform .5s ease;
        }

        .image-card:hover img {
            transform: scale(1.04);
        }

        .image-card::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, transparent 60%, rgba(8, 26, 48, .35));
        }

        .float-tag {
            position: absolute;
            top: 20px;
            left: 20px;
            background: rgba(255, 255, 255, .92);
            backdrop-filter: blur(10px);
            padding: 8px 18px;
            border-radius: 999px;
            font-size: 13px;
            font-weight: 600;
            color: var(--dark-text);
            box-shadow: 0 4px 16px rgba(22, 35, 61, .12);
            z-index: 2;
        }

        .check-list {
            list-style: none;
            padding: 0;
            margin: 20px 0 0;
        }

        .check-list li {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: .95rem;
            color: var(--dark-text);
            padding: 8px 0;
            border-bottom: 1px solid rgba(22, 35, 61, .04);
        }

        .check-list li:last-child {
            border-bottom: none;
        }

        .check-list i {
            color: var(--energy);
            font-size: 16px;
            min-width: 18px;
        }

        .text-block h2 {
            font-size: clamp(1.5rem, 2.6vw, 2rem);
            font-weight: 700;
            color: var(--dark-text);
            margin: 12px 0 14px;
            line-height: 1.3;
        }

        .text-block>p {
            color: var(--muted-text);
            font-size: .95rem;
            line-height: 1.75;
        }

        /* ===== 核心能力 ===== */
        .tech-core-section {
            background: linear-gradient(145deg, var(--deep-bg-start), var(--deep-bg-end));
            position: relative;
            overflow: hidden;
        }

        .tech-core-section::before {
            content: "";
            position: absolute;
            top: -80px;
            right: -80px;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(0, 224, 184, .12), transparent 70%);
            border-radius: 50%;
        }

        .tech-core-section .section-head h2 {
            color: #fff;
        }

        .tech-core-section .section-head p {
            color: rgba(235, 242, 251, .6);
        }

        .tech-core-section .section-eyebrow {
            color: var(--energy);
        }

        .core-card {
            background: rgba(255, 255, 255, .055);
            backdrop-filter: blur(16px) saturate(140%);
            border: 1px solid rgba(255, 255, 255, .12);
            border-radius: 20px;
            padding: 36px 32px;
            height: 100%;
            transition: var(--transition);
            box-shadow: inset 0 1px 0 rgba(255, 255, 255, .12), 0 12px 40px rgba(4, 17, 36, .35);
            position: relative;
        }

        .core-card:hover {
            transform: translateY(-4px);
            border-color: rgba(0, 224, 184, .3);
        }

        .core-card-dark {
            background: linear-gradient(145deg, rgba(27, 109, 242, .15), rgba(0, 224, 184, .08));
            border-color: rgba(27, 109, 242, .25);
        }

        .core-icon {
            width: 56px;
            height: 56px;
            border-radius: 16px;
            background: linear-gradient(135deg, var(--primary), var(--energy));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: #fff;
            margin-bottom: 20px;
            box-shadow: 0 0 24px rgba(0, 224, 184, .25);
        }

        .core-card h3 {
            font-size: 1.25rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }

        .core-card>p {
            font-size: .9rem;
            line-height: 1.75;
            color: rgba(235, 242, 251, .65);
            margin-bottom: 24px;
        }

        .core-metrics {
            display: flex;
            gap: 32px;
            flex-wrap: wrap;
            border-top: 1px solid rgba(255, 255, 255, .1);
            padding-top: 20px;
        }

        .core-metrics span {
            font-size: 13px;
            color: rgba(235, 242, 251, .6);
            display: inline-flex;
            align-items: baseline;
            gap: 6px;
        }

        .core-metrics strong {
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--energy);
        }

        /* ===== 服务流程 ===== */
        .process-section {
            background: var(--light-bg);
        }

        .process-grid {
            display: flex;
            align-items: stretch;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        .process-step {
            flex: 1;
            min-width: 180px;
            max-width: 240px;
            background: var(--white);
            border: 1px solid rgba(22, 35, 61, .06);
            border-radius: 20px;
            padding: 28px 24px;
            text-align: center;
            transition: var(--transition);
            box-shadow: 0 4px 16px rgba(22, 35, 61, .04);
            position: relative;
        }

        .process-step:hover {
            transform: translateY(-6px);
            box-shadow: 0 12px 36px rgba(22, 35, 61, .08);
        }

        .step-num {
            font-size: 2.5rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary), var(--energy));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            line-height: 1;
            margin-bottom: 10px;
            display: inline-block;
        }

        .process-step h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--dark-text);
            margin-bottom: 8px;
        }

        .process-step p {
            font-size: .85rem;
            line-height: 1.6;
            color: var(--muted-text);
            margin-bottom: 0;
        }

        .process-arrow {
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 18px;
            min-width: 24px;
            align-self: center;
        }

        /* ===== FAQ ===== */
        .faq-section .section-head {
            margin-bottom: 40px;
        }

        .faq-card {
            background: var(--white);
            border: 1px solid rgba(22, 35, 61, .06) !important;
            border-radius: 16px !important;
            margin-bottom: 16px !important;
            box-shadow: 0 4px 16px rgba(22, 35, 61, .03);
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-card:hover {
            box-shadow: 0 8px 30px rgba(22, 35, 61, .07);
        }

        .faq-card .accordion-button {
            background: transparent;
            box-shadow: none;
            font-size: 1rem;
            font-weight: 600;
            color: var(--dark-text);
            padding: 20px 24px;
            position: relative;
        }

        .faq-card .accordion-button:not(.collapsed) {
            color: var(--primary);
        }

        .faq-card .accordion-button::after {
            display: none;
        }

        .faq-icon {
            width: 28px;
            height: 28px;
            min-width: 28px;
            border-radius: 8px;
            background: rgba(27, 109, 242, .08);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-left: auto;
            transition: all .3s ease;
            font-size: 12px;
        }

        .faq-icon i {
            color: var(--primary);
            transition: transform .3s ease;
        }

        .faq-card .accordion-button:not(.collapsed) .faq-icon {
            background: var(--primary);
        }

        .faq-card .accordion-button:not(.collapsed) .faq-icon i {
            color: #fff;
            transform: rotate(45deg);
        }

        .faq-card .accordion-body {
            padding: 0 24px 20px;
            color: var(--muted-text);
            font-size: .9rem;
            line-height: 1.75;
            border-top: 1px solid rgba(22, 35, 61, .05);
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(145deg, var(--deep-bg-start) 0%, #0B2444 50%, var(--deep-bg-end) 100%);
            position: relative;
            overflow: hidden;
            padding: 100px 0;
            text-align: center;
        }

        .cta-section::before {
            content: "";
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            opacity: .15;
        }

        .cta-section::after {
            content: "";
            position: absolute;
            top: 50%;
            left: 50%;
            width: 500px;
            height: 500px;
            transform: translate(-50%, -50%);
            background: radial-gradient(circle, rgba(0, 224, 184, .12), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .cta-section .container {
            position: relative;
            z-index: 2;
        }

        .cta-section h2 {
            font-size: clamp(1.75rem, 3.5vw, 2.75rem);
            font-weight: 800;
            color: #fff;
            margin-bottom: 14px;
            letter-spacing: -0.01em;
        }

        .cta-section p {
            font-size: 1rem;
            color: rgba(235, 242, 251, .65);
            margin-bottom: 32px;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
        }

        .cta-buttons {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        .btn-primary-glow {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: linear-gradient(135deg, var(--primary), #0E5ADB);
            color: #fff;
            border: none;
            border-radius: 999px;
            padding: 14px 36px;
            font-size: 1rem;
            font-weight: 600;
            box-shadow: 0 0 30px rgba(27, 109, 242, .4);
            transition: all .3s ease;
        }

        .btn-primary-glow:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 44px rgba(27, 109, 242, .55);
            color: #fff;
        }

        .btn-outline-glow {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            background: rgba(255, 255, 255, .08);
            color: #EBF2FB;
            border: 1px solid rgba(255, 255, 255, .2);
            border-radius: 999px;
            padding: 14px 36px;
            font-size: 1rem;
            font-weight: 600;
            backdrop-filter: blur(12px);
            transition: all .3s ease;
        }

        .btn-outline-glow:hover {
            background: rgba(255, 255, 255, .14);
            border-color: var(--energy);
            color: var(--energy);
            transform: translateY(-2px);
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: #050E1C;
            color: rgba(235, 242, 251, .65);
            font-size: .9rem;
            padding: 64px 0 0;
        }

        .site-footer .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #fff;
            font-size: 1.2rem;
            font-weight: 800;
            margin-bottom: 16px;
        }

        .site-footer .footer-brand .brand-icon {
            background: linear-gradient(135deg, #00E0B8, #1B6DF2);
        }

        .site-footer p {
            font-size: .875rem;
            line-height: 1.75;
        }

        .social-icons {
            display: flex;
            gap: 10px;
            margin-top: 20px;
        }

        .social-icons a {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: rgba(255, 255, 255, .06);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: rgba(235, 242, 251, .6);
            font-size: 14px;
            transition: var(--transition);
        }

        .social-icons a:hover {
            background: rgba(0, 224, 184, .15);
            color: var(--energy);
            transform: translateY(-2px);
        }

        .site-footer h4 {
            color: #fff;
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 12px;
        }

        .site-footer h4::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 0;
            width: 26px;
            height: 2px;
            background: var(--energy);
            border-radius: 4px;
        }

        .site-footer ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .site-footer ul li {
            margin-bottom: 12px;
        }

        .site-footer ul a {
            color: rgba(235, 242, 251, .6);
            font-size: .875rem;
            transition: var(--transition);
        }

        .site-footer ul a:hover {
            color: var(--energy);
            padding-left: 4px;
        }

        .site-footer ul li i {
            color: var(--energy);
            margin-right: 8px;
            font-size: 13px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, .08);
            padding: 24px 0;
            margin-top: 48px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
        }

        .footer-bottom p {
            font-size: .8rem;
            margin: 0;
            color: rgba(235, 242, 251, .4);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 991px) {
            .nav-search {
                width: 100%;
                margin-bottom: 8px;
            }

            .nav-actions {
                flex-direction: column;
                align-items: stretch;
                padding: 12px 0;
                gap: 10px;
            }

            .nav-actions .btn-glow {
                text-align: center;
            }

            .site-nav .nav-link {
                padding: 14px 0 !important;
            }

            .section {
                padding: 72px 0;
            }

            .core-card {
                padding: 28px 24px;
            }
        }

        @media (max-width: 767px) {
            .site-nav {
                min-height: 56px;
            }

            .site-nav .navbar-brand {
                font-size: 1.05rem;
                padding: 10px 0;
            }

            .brand-icon {
                width: 28px;
                height: 28px;
                min-width: 28px;
                border-radius: 8px;
                font-size: 12px;
            }

            .category-hero {
                padding: 56px 0 48px;
                min-height: auto;
            }

            .category-hero h1 {
                font-size: 1.75rem;
            }

            .category-desc {
                font-size: .9rem;
            }

            .section {
                padding: 56px 0;
            }

            .section-head {
                margin-bottom: 36px;
            }

            .scene-card {
                padding: 24px 20px;
            }

            .image-card img {
                height: 240px;
            }

            .process-grid {
                flex-direction: column;
                align-items: center;
            }

            .process-step {
                max-width: 100%;
                width: 100%;
            }

            .process-arrow {
                transform: rotate(90deg);
                padding: 8px 0;
            }

            .cta-section {
                padding: 64px 0;
            }

            .cta-buttons .btn {
                width: 100%;
                justify-content: center;
            }

            .core-metrics {
                gap: 16px;
            }

            .core-metrics strong {
                font-size: 1.3rem;
            }

            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 575px) {
            .badge-tag {
                font-size: 12px;
                padding: 6px 14px;
            }

            .hero-badges {
                gap: 8px;
            }

            .section-head h2 {
                font-size: 1.4rem;
            }

            .text-block h2 {
                font-size: 1.3rem;
            }

            .core-card {
                padding: 24px 20px;
            }

            .core-icon {
                width: 46px;
                height: 46px;
                font-size: 20px;
            }
        }

/* roulang page: category4 */
:root {
      --c-bg-dark: #081A30;
      --c-bg-dark-2: #0D2440;
      --c-primary: #1B6DF2;
      --c-primary-hover: #1557C4;
      --c-primary-gradient: linear-gradient(135deg, #1B6DF2, #0E5ADB);
      --c-accent: #00E0B8;
      --c-accent-hover: #31F0CD;
      --c-warn: #FF6B4A;
      --c-bg-light: #F5F8FC;
      --c-white: #FFFFFF;
      --c-text-dark: #EBF2FB;
      --c-text-dark-2: rgba(235, 242, 251, .65);
      --c-text-light: #16233D;
      --c-text-light-2: #5A6B82;
      --c-border-light: rgba(22, 35, 61, .08);
      --c-border-dark: rgba(255, 255, 255, .10);
      --radius-card: 16px;
      --radius-btn: 999px;
      --radius-badge: 6px;
      --radius-input: 10px;
      --radius-img: 14px;
      --shadow-card-light: 0 8px 30px rgba(22, 35, 61, .06);
      --shadow-card-dark: 0 12px 40px rgba(4, 17, 36, .35);
      --transition: .25s ease;
      --section-space-desktop: 96px;
      --section-space-tablet: 64px;
      --section-space-mobile: 48px;
    }

    *, *::before, *::after { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", sans-serif;
      font-size: 16px;
      line-height: 1.625;
      color: var(--c-text-light);
      background: var(--c-bg-light);
      -webkit-font-smoothing: antialiased;
    }
    a { color: var(--c-primary); text-decoration: none; transition: color .2s ease; }
    a:hover { color: var(--c-primary-hover); }
    img { max-width: 100%; height: auto; border: 0; }
    ul, ol { margin: 0; padding: 0; list-style: none; }
    .container { max-width: 1200px; }

    /* ===== Navbar ===== */
    .site-nav {
      background: rgba(255, 255, 255, .98);
      min-height: 64px;
      padding: 0;
      border-bottom: 1px solid rgba(22, 35, 61, .08);
      box-shadow: 0 4px 20px rgba(10, 30, 60, .06);
      position: sticky;
      top: 0;
      z-index: 1030;
      backdrop-filter: blur(8px);
    }
    .site-nav .navbar-brand {
      display: flex;
      align-items: center;
      font-weight: 800;
      font-size: 1.125rem;
      color: var(--c-text-light);
      letter-spacing: .01em;
      padding: 0;
    }
    .brand-icon {
      width: 28px;
      height: 28px;
      border-radius: 8px;
      background: linear-gradient(135deg, #00E0B8, #00C2A8);
      color: #fff;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: .8125rem;
      margin-right: 8px;
      box-shadow: 0 0 14px rgba(0, 224, 184, .25);
      flex-shrink: 0;
    }
    .brand-text { color: var(--c-text-light); font-weight: 700; }
    .site-nav .navbar-toggler {
      border: none;
      color: var(--c-text-light);
      font-size: 1.25rem;
      padding: 4px 8px;
      transition: color .2s ease;
    }
    .site-nav .navbar-toggler:hover { color: var(--c-primary); }
    .site-nav .navbar-toggler:focus { box-shadow: none; }
    .site-nav .navbar-nav { gap: 2px; }
    .site-nav .nav-link {
      font-size: .9375rem;
      color: var(--c-text-light);
      font-weight: 500;
      padding: .5rem .875rem !important;
      border-radius: 8px;
      position: relative;
      transition: color .2s ease, background .2s ease;
    }
    .site-nav .nav-link:hover { color: var(--c-primary); background: rgba(27, 109, 242, .04); }
    .site-nav .nav-item.active .nav-link {
      color: var(--c-primary);
      font-weight: 600;
    }
    .site-nav .nav-item.active .nav-link::after {
      content: "";
      position: absolute;
      left: .875rem;
      right: .875rem;
      bottom: 2px;
      height: 2px;
      border-radius: 2px;
      background: var(--c-primary);
    }
    .nav-actions { display: flex; align-items: center; gap: 12px; }
    .nav-search {
      display: flex;
      align-items: center;
      background: var(--c-bg-light);
      border-radius: 999px;
      padding: 6px 14px;
      border: 1px solid rgba(22, 35, 61, .08);
      width: 200px;
      transition: border-color .2s ease, box-shadow .2s ease;
    }
    .nav-search i { color: var(--c-text-light-2); font-size: .875rem; margin-right: 8px; }
    .nav-search input {
      border: none;
      background: transparent;
      outline: none;
      font-size: .875rem;
      color: var(--c-text-light);
      width: 100%;
      padding: 0;
    }
    .nav-search input::placeholder { color: #9AA8BE; }
    .nav-search:focus-within {
      border-color: var(--c-primary);
      box-shadow: 0 0 0 3px rgba(27, 109, 242, .15);
    }

    /* ===== Buttons ===== */
    .btn {
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease, color .2s ease;
    }
    .btn-primary {
      background: linear-gradient(135deg, #1B6DF2, #0E5ADB);
      border: none;
      color: #fff;
      padding: 9px 22px;
      box-shadow: 0 0 24px rgba(27, 109, 242, .38);
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, #1557C4, #0B4ABD);
      color: #fff;
      transform: translateY(-2px);
      box-shadow: 0 0 36px rgba(27, 109, 242, .5);
    }
    .btn-primary:active {
      transform: translateY(-1px);
      box-shadow: 0 0 20px rgba(27, 109, 242, .4);
    }
    .btn-primary:focus { box-shadow: 0 0 0 3px rgba(27, 109, 242, .25); }
    .btn-lg {
      padding: 14px 36px;
      font-size: 1rem;
    }
    .btn-sm { padding: 7px 18px; font-size: .875rem; }

    /* ===== Section Common ===== */
    .section-label {
      display: inline-block;
      font-size: .8125rem;
      font-weight: 700;
      letter-spacing: .04em;
      color: var(--c-primary);
      text-transform: uppercase;
      margin-bottom: 12px;
    }
    .section-head { margin-bottom: 48px; }
    .section-head h2 {
      font-size: clamp(1.5rem, 3vw, 2.25rem);
      font-weight: 700;
      color: var(--c-text-light);
      letter-spacing: -.01em;
      margin-bottom: 12px;
    }
    .section-head p {
      color: var(--c-text-light-2);
      max-width: 560px;
      margin: 0 auto;
      font-size: .9375rem;
    }

    /* ===== Category Hero ===== */
    .cat-hero {
      min-height: 240px;
      padding: 4.5rem 0 3.5rem;
      background: linear-gradient(145deg, #F5F8FC 0%, #E8F0FA 100%);
      position: relative;
      overflow: hidden;
    }
    .cat-hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background: url('/assets/images/backpic/back-1.png') center/cover no-repeat;
      opacity: .16;
      pointer-events: none;
    }
    .cat-hero::after {
      content: "";
      position: absolute;
      top: -80px;
      right: -60px;
      width: 280px;
      height: 280px;
      background: radial-gradient(circle, rgba(27, 109, 242, .16), transparent 70%);
      pointer-events: none;
    }
    .cat-hero .container { position: relative; z-index: 2; }
    .cat-eyebrow {
      display: inline-block;
      font-size: .8125rem;
      font-weight: 700;
      letter-spacing: .08em;
      color: var(--c-primary);
      text-transform: uppercase;
      margin-bottom: 12px;
      background: rgba(27, 109, 242, .08);
      padding: 4px 14px;
      border-radius: 999px;
    }
    .cat-hero h1 {
      font-size: clamp(2rem, 4vw, 2.75rem);
      font-weight: 800;
      color: var(--c-text-light);
      letter-spacing: -.01em;
      margin: 0 0 12px;
    }
    .cat-hero p {
      font-size: 1.0625rem;
      color: var(--c-text-light-2);
      max-width: 640px;
      margin: 0 0 24px;
      line-height: 1.7;
    }
    .cat-hero-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }
    .cat-hero-meta span {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: .875rem;
      color: var(--c-text-light);
      background: rgba(255, 255, 255, .9);
      border: 1px solid rgba(22, 35, 61, .08);
      padding: 6px 14px;
      border-radius: 999px;
      box-shadow: 0 4px 14px rgba(22, 35, 61, .04);
    }
    .cat-hero-meta i { color: var(--c-primary); }

    /* ===== Feature Block (图文交错) ===== */
    .feature-block {
      background: var(--c-white);
      padding: var(--section-space-desktop) 0;
    }
    .feature-row { margin-bottom: 96px; }
    .feature-row:last-child { margin-bottom: 0; }
    .feature-media {
      position: relative;
      border-radius: var(--radius-img);
      overflow: hidden;
      box-shadow: 0 16px 40px rgba(22, 35, 61, .1);
    }
    .feature-media img {
      width: 100%;
      display: block;
      transition: transform .5s ease;
    }
    .feature-media:hover img { transform: scale(1.03); }
    .media-tag {
      position: absolute;
      top: 16px;
      left: 16px;
      background: rgba(8, 26, 48, .75);
      backdrop-filter: blur(8px);
      color: var(--c-text-dark);
      font-size: .8125rem;
      font-weight: 600;
      padding: 6px 14px;
      border-radius: 999px;
      letter-spacing: .02em;
    }
    .feature-content h2 {
      font-size: clamp(1.375rem, 2.5vw, 1.875rem);
      font-weight: 700;
      color: var(--c-text-light);
      margin-bottom: 16px;
      letter-spacing: -.01em;
      line-height: 1.35;
    }
    .feature-content p {
      color: var(--c-text-light-2);
      font-size: .9375rem;
      line-height: 1.7;
      margin-bottom: 8px;
    }
    .feature-list { margin-top: 8px; }
    .feature-list li {
      display: flex;
      gap: 10px;
      color: var(--c-text-light-2);
      font-size: .9375rem;
      margin-bottom: 10px;
    }
    .feature-list i { color: var(--c-accent); margin-top: 5px; font-size: .9375rem; }

    /* ===== Feature Cards (深色两列) ===== */
    .feature-cards-section {
      background: linear-gradient(145deg, var(--c-bg-dark), var(--c-bg-dark-2));
      padding: var(--section-space-desktop) 0;
      position: relative;
      overflow: hidden;
    }
    .feature-cards-section::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
      opacity: .08;
      pointer-events: none;
    }
    .feature-cards-section::after {
      content: "";
      position: absolute;
      top: -100px;
      left: -80px;
      width: 320px;
      height: 320px;
      background: radial-gradient(circle, rgba(27, 109, 242, .18), transparent 70%);
      pointer-events: none;
    }
    .feature-cards-section .container { position: relative; z-index: 2; }
    .feature-cards-section .section-head h2 { color: var(--c-text-dark); }
    .feature-cards-section .section-head p { color: var(--c-text-dark-2); }
    .large-feat-card {
      background: rgba(255, 255, 255, .055);
      backdrop-filter: blur(16px) saturate(140%);
      border: 1px solid rgba(255, 255, 255, .12);
      border-radius: 20px;
      padding: 36px;
      height: 100%;
      box-shadow: inset 0 1px 0 rgba(255, 255, 255, .12), 0 12px 40px rgba(4, 17, 36, .35);
      transition: transform .25s ease, box-shadow .25s ease;
    }
    .large-feat-card:hover {
      transform: translateY(-4px);
      box-shadow: inset 0 1px 0 rgba(255, 255, 255, .12), 0 20px 48px rgba(4, 17, 36, .5);
    }
    .feat-icon {
      width: 52px;
      height: 52px;
      border-radius: 14px;
      background: linear-gradient(135deg, rgba(0, 224, 184, .2), rgba(0, 224, 184, .08));
      border: 1px solid rgba(0, 224, 184, .25);
      color: var(--c-accent);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      margin-bottom: 20px;
      box-shadow: 0 0 20px rgba(0, 224, 184, .12);
    }
    .large-feat-card h3 {
      font-size: 1.25rem;
      font-weight: 600;
      color: var(--c-text-dark);
      margin-bottom: 12px;
    }
    .large-feat-card p {
      color: var(--c-text-dark-2);
      font-size: .9375rem;
      line-height: 1.75;
      margin-bottom: 20px;
    }
    .feat-link {
      color: var(--c-accent);
      font-size: .875rem;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: gap .2s ease, color .2s ease;
    }
    .feat-link:hover { color: var(--c-accent-hover); gap: 12px; }
    .feat-link i { font-size: .8125rem; }

    /* ===== Relation Section ===== */
    .relation-section {
      background: var(--c-bg-light);
      padding: var(--section-space-desktop) 0;
    }
    .relation-card {
      display: block;
      background: var(--c-white);
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid rgba(22, 35, 61, .06);
      box-shadow: var(--shadow-card-light);
      transition: transform .25s ease, box-shadow .25s ease;
      height: 100%;
      color: var(--c-text-light);
      text-decoration: none;
    }
    .relation-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 16px 40px rgba(22, 35, 61, .1);
      color: var(--c-text-light);
    }
    .relation-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
      display: block;
      transition: transform .5s ease;
    }
    .relation-card:hover img { transform: scale(1.04); }
    .relation-info { padding: 20px 24px 24px; }
    .relation-tag {
      display: inline-block;
      font-size: .75rem;
      font-weight: 600;
      color: var(--c-primary);
      background: rgba(27, 109, 242, .08);
      padding: 4px 10px;
      border-radius: var(--radius-badge);
      margin-bottom: 10px;
    }
    .relation-info h3 {
      font-size: 1.0625rem;
      font-weight: 600;
      color: var(--c-text-light);
      margin-bottom: 14px;
      line-height: 1.45;
    }
    .relation-link {
      font-size: .875rem;
      color: var(--c-primary);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .relation-link i { transition: transform .2s ease; }
    .relation-card:hover .relation-link i { transform: translateX(4px); }

    /* ===== FAQ ===== */
    .faq-section {
      background: var(--c-white);
      padding: var(--section-space-desktop) 0;
    }
    .faq-accordion .accordion-item {
      border: 1px solid rgba(22, 35, 61, .08);
      border-radius: 20px !important;
      background: var(--c-white);
      margin-bottom: 14px;
      box-shadow: 0 4px 16px rgba(22, 35, 61, .04);
      overflow: hidden;
    }
    .faq-accordion .accordion-header { margin-bottom: 0; }
    .faq-accordion .accordion-button {
      font-size: 1rem;
      font-weight: 600;
      color: var(--c-text-light);
      background: var(--c-white);
      padding: 16px 24px;
      min-height: 48px;
      line-height: 1.5;
      border: none;
      box-shadow: none;
      transition: color .2s ease, background .2s ease;
    }
    .faq-accordion .accordion-button::after {
      font-family: "Font Awesome 6 Free";
      font-weight: 900;
      content: "\f067";
      background: none;
      transition: transform .2s ease;
      color: var(--c-primary);
      width: auto;
      height: auto;
      font-size: .875rem;
      flex-shrink: 0;
      margin-left: auto;
    }
    .faq-accordion .accordion-button:not(.collapsed)::after { transform: rotate(45deg); }
    .faq-accordion .accordion-button:not(.collapsed) {
      background: var(--c-white);
      color: var(--c-primary);
    }
    .faq-accordion .accordion-button:focus { box-shadow: none; }
    .faq-accordion .accordion-button:hover { color: var(--c-primary); background: rgba(27, 109, 242, .02); }
    .faq-accordion .accordion-body {
      padding: 0 24px 24px;
      color: var(--c-text-light-2);
      font-size: .9375rem;
      line-height: 1.75;
      border-top: 1px solid rgba(22, 35, 61, .06);
      padding-top: 16px;
    }

    /* ===== CTA ===== */
    .cat-cta {
      background: linear-gradient(145deg, var(--c-bg-dark), var(--c-bg-dark-2));
      padding: 80px 0;
      text-align: center;
      position: relative;
      overflow: hidden;
    }
    .cat-cta::before {
      content: "";
      position: absolute;
      inset: 0;
      background: url('/assets/images/backpic/back-3.png') center/cover no-repeat;
      opacity: .08;
      pointer-events: none;
    }
    .cat-cta::after {
      content: "";
      position: absolute;
      bottom: -120px;
      right: 10%;
      width: 300px;
      height: 300px;
      background: radial-gradient(circle, rgba(0, 224, 184, .12), transparent 70%);
      pointer-events: none;
    }
    .cat-cta .container { position: relative; z-index: 2; }
    .cat-cta h2 {
      color: var(--c-text-dark);
      font-size: clamp(1.5rem, 3vw, 2.125rem);
      font-weight: 700;
      margin-bottom: 12px;
      letter-spacing: -.01em;
    }
    .cat-cta p {
      color: var(--c-text-dark-2);
      font-size: 1rem;
      margin-bottom: 28px;
      max-width: 520px;
      margin-left: auto;
      margin-right: auto;
    }

    /* ===== Footer ===== */
    .site-footer {
      background: #050E1C;
      color: rgba(235, 242, 251, .6);
      padding: 64px 0 24px;
    }
    .footer-brand {
      display: flex;
      align-items: center;
      font-size: 1.125rem;
      font-weight: 700;
      color: var(--c-text-dark);
      margin-bottom: 16px;
    }
    .footer-brand .brand-icon { margin-right: 8px; }
    .site-footer p {
      font-size: .875rem;
      line-height: 1.7;
      color: rgba(235, 242, 251, .55);
      margin-bottom: 0;
    }
    .site-footer h4 {
      font-size: .9375rem;
      color: var(--c-text-dark);
      font-weight: 600;
      margin-bottom: 16px;
    }
    .site-footer ul li { margin-bottom: 8px; }
    .site-footer ul li a {
      color: rgba(235, 242, 251, .6);
      font-size: .875rem;
      text-decoration: none;
      transition: color .2s ease;
    }
    .site-footer ul li a:hover { color: var(--c-accent); }
    .site-footer ul li i { margin-right: 8px; color: rgba(235, 242, 251, .4); }
    .social-icons {
      display: flex;
      gap: 10px;
      margin-top: 16px;
    }
    .social-icons a {
      width: 36px;
      height: 36px;
      border-radius: 10px;
      background: rgba(255, 255, 255, .06);
      color: rgba(235, 242, 251, .65);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: .9375rem;
      transition: all .2s ease;
    }
    .social-icons a:hover {
      background: var(--c-accent);
      color: var(--c-bg-dark);
      transform: translateY(-2px);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, .08);
      margin-top: 40px;
      padding-top: 20px;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      gap: 8px;
      font-size: .8125rem;
      color: rgba(235, 242, 251, .45);
    }
    .footer-bottom p { margin: 0; font-size: .8125rem; color: rgba(235, 242, 251, .45); }

    /* ===== Responsive ===== */
    @media (max-width: 991.98px) {
      .feature-block, .feature-cards-section, .relation-section, .faq-section {
        padding-top: var(--section-space-tablet);
        padding-bottom: var(--section-space-tablet);
      }
      .feature-row { margin-bottom: 56px; }
      .cat-cta { padding: 64px 0; }
      .nav-search { width: 160px; }
    }
    @media (max-width: 767.98px) {
      .site-nav { min-height: 56px; }
      .site-nav .navbar-brand { font-size: 1rem; }
      .cat-hero { padding: 3rem 0 2.5rem; }
      .cat-hero h1 { font-size: 1.75rem; }
      .cat-hero p { font-size: .9375rem; }
      .cat-hero-meta span { font-size: .8125rem; padding: 5px 12px; }
      .feature-block, .feature-cards-section, .relation-section, .faq-section {
        padding-top: var(--section-space-mobile);
        padding-bottom: var(--section-space-mobile);
      }
      .section-head { margin-bottom: 32px; }
      .feature-row { margin-bottom: 40px; }
      .feature-content { margin-top: 20px; }
      .large-feat-card { padding: 24px; }
      .large-feat-card + .large-feat-card { margin-top: 20px; }
      .nav-actions {
        display: flex;
        padding: 12px 0;
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
      }
      .nav-search { width: 100%; }
      .nav-actions .btn { width: 100%; text-align: center; }
      .cat-cta { padding: 48px 0; }
      .cat-cta h2 { font-size: 1.375rem; }
      .cat-cta p { font-size: .875rem; }
      .site-footer { padding: 48px 0 24px; }
      .social-icons { margin-bottom: 24px; }
      .footer-bottom { flex-direction: column; text-align: center; justify-content: center; }
    }
    @media (max-width: 575.98px) {
      .relation-card img { height: 200px; }
    }