/* roulang page: index */
:root{
  --c-primary:#1B6EF5;
  --c-primary-weak:#E8F0FE;
  --c-accent:#FF6B35;
  --c-page:#F5F8FC;
  --c-card:#FFFFFF;
  --c-text:#16243D;
  --c-text-body:#3D4A5C;
  --c-text-muted:#7C8BA1;
  --c-border:#E4EAF2;
  --c-success:#14B07B;
  --c-warning:#E5A800;
  --c-dark-bg:#0B1B32;
  --radius-sm:6px;
  --radius-md:12px;
  --radius-lg:20px;
  --radius-xl:28px;
  --shadow-card:0 2px 8px rgba(22,36,61,.06);
  --shadow-card-hover:0 12px 28px rgba(22,36,61,.12);
  --shadow-nav:0 4px 16px rgba(22,36,61,.08);
  --font-cn:"HarmonyOS Sans SC","PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  --font-num:Inter,"SF Pro Display","Helvetica Neue",sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-cn);
  background:var(--c-page);
  color:var(--c-text);
  line-height:1.75;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border:0}
a{text-decoration:none;color:inherit;transition:color .2s ease}
button{font-family:inherit;cursor:pointer;border:0;background:none}
ul,ol{list-style:none}
.container-site{max-width:1280px;margin:0 auto;padding-left:20px;padding-right:20px}
@media(min-width:768px){.container-site{padding-left:32px;padding-right:32px}}
@media(min-width:1280px){.container-site{padding-left:48px;padding-right:48px}}

/* ===== 按钮 ===== */
.btn-accent{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:10px 24px;border-radius:var(--radius-sm);
  background:var(--c-accent);color:#fff;font-weight:600;font-size:15px;
  transition:filter .2s,box-shadow .2s,transform .1s,background .2s;
  outline-offset:2px;
}
.btn-accent:hover{filter:brightness(1.06);box-shadow:0 2px 12px rgba(255,107,53,.28)}
.btn-accent:active{transform:translateY(1px)}
.btn-accent:focus-visible{outline:2px solid var(--c-primary);outline-offset:2px}
.btn-ghost{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:10px 24px;border-radius:var(--radius-sm);
  background:transparent;color:var(--c-primary);border:2px solid var(--c-primary);
  font-weight:600;font-size:15px;transition:background .2s,transform .1s;
  outline-offset:2px;
}
.btn-ghost:hover{background:var(--c-primary-weak)}
.btn-ghost:active{background:#dbe7fd;transform:translateY(1px)}
.btn-ghost:focus-visible{outline:2px solid var(--c-primary);outline-offset:2px}
.btn-white-ghost{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:10px 24px;border-radius:var(--radius-sm);
  background:transparent;color:#fff;border:2px solid rgba(255,255,255,.85);
  font-weight:600;font-size:15px;transition:background .2s,transform .1s;
}
.btn-white-ghost:hover{background:rgba(255,255,255,.12)}
.btn-white-ghost:active{transform:translateY(1px)}

/* ===== Header / 导航 ===== */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,.96);
  border-bottom:1px solid var(--c-border);
  box-shadow:var(--shadow-nav);
}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;height:76px;gap:24px}
.nav-logo{
  display:flex;align-items:center;gap:10px;flex-shrink:0;
  font-weight:800;font-size:22px;color:var(--c-primary);letter-spacing:-.5px;
}
.nav-logo .logo-mark{
  width:36px;height:36px;border-radius:10px;background:var(--c-primary);
  display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:18px;
}
.nav-links{display:flex;align-items:center;gap:6px}
.nav-link{
  display:inline-flex;align-items:center;gap:6px;padding:9px 16px;
  border-radius:var(--radius-sm);font-weight:500;font-size:15px;color:var(--c-text-body);
  transition:background .2s,color .2s;
}
.nav-link:hover{background:var(--c-primary-weak);color:var(--c-primary)}
.nav-link.active{background:var(--c-primary-weak);color:var(--c-primary);font-weight:600}
.mega-trigger{position:relative}
.mega-trigger .nav-link{cursor:default}
.mega-panel{
  position:absolute;top:calc(100%+12px);left:0;width:640px;max-width:88vw;
  background:#fff;border:1px solid var(--c-border);border-radius:var(--radius-md);
  box-shadow:var(--shadow-card-hover);padding:24px;display:none;
  grid-template-columns:1fr 1fr 1fr;gap:24px;
}
.mega-trigger:hover .mega-panel{display:grid}
.mega-panel h4{font-size:13px;color:var(--c-text-muted);font-weight:600;margin-bottom:12px;letter-spacing:.03em}
.mega-panel .mega-list li{margin-bottom:8px}
.mega-panel .mega-list a{font-size:14px;color:var(--c-text-body);display:inline-flex;align-items:center;gap:6px;padding:4px 0;border-radius:4px}
.mega-panel .mega-list a:hover{color:var(--c-primary)}
.mega-card{
  background:var(--c-primary-weak);border-radius:var(--radius-md);padding:16px;
  display:flex;flex-direction:column;justify-content:space-between;min-height:120px;
}
.mega-card .btn-accent{font-size:13px;min-height:36px;padding:6px 16px}
.nav-cta{display:flex;align-items:center;gap:12px}
.nav-toggle{display:none;width:44px;height:44px;align-items:center;justify-content:center;border-radius:var(--radius-sm);color:var(--c-text)}
.nav-toggle:hover{background:var(--c-primary-weak)}
@media(max-width:992px){
  .nav-links{position:fixed;top:76px;left:0;right:0;background:#fff;border-bottom:1px solid var(--c-border);flex-direction:column;align-items:stretch;padding:16px 20px 24px;gap:4px;display:none;box-shadow:var(--shadow-card-hover)}
  .nav-links.open{display:flex}
  .nav-toggle{display:inline-flex}
  .mega-trigger .mega-panel{position:static;width:100%;display:none;box-shadow:none;border:0;padding:0 0 8px 16px}
  .mega-trigger.open .mega-panel{display:grid;grid-template-columns:1fr}
  .btn-accent.nav-download{margin-left:auto}
}
@media(max-width:992px){
  .nav-wrap{height:auto;min-height:64px;padding:8px 0;flex-wrap:wrap}
}

/* ===== Hero ===== */
.hero{
  position:relative;min-height:560px;display:flex;align-items:center;
  background:url('/assets/images/backpic/back-1.png') center/cover no-repeat;
}
@media(max-width:768px){.hero{min-height:480px}}
.hero-overlay{
  position:absolute;inset:0;
  background:linear-gradient(90deg,rgba(22,36,61,.78) 0%,rgba(22,36,61,.38) 55%,rgba(22,36,61,.08) 100%);
}
.hero-content{position:relative;z-index:2;display:grid;grid-template-columns:5fr 3fr;gap:40px;align-items:center;width:100%}
@media(max-width:992px){.hero-content{grid-template-columns:1fr}}
.hero h1{
  font-size:40px;line-height:1.3;color:#fff;font-weight:800;letter-spacing:-.5px;max-width:720px;
  text-shadow:0 2px 8px rgba(0,0,0,.25);
}
@media(max-width:768px){.hero h1{font-size:30px}}
.hero-sub{font-size:18px;color:rgba(255,255,255,.9);margin-top:16px;max-width:620px;line-height:1.7}
@media(max-width:768px){.hero-sub{font-size:16px}}
.hero-trust{display:flex;flex-wrap:wrap;gap:18px;margin-top:28px}
.hero-trust span{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:rgba(255,255,255,.85)}
.hero-trust svg{width:16px;height:16px;color:var(--c-accent)}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:32px}
.hero-badge-card{
  background:rgba(255,255,255,.92);border-radius:var(--radius-lg);padding:20px 24px;
  box-shadow:var(--shadow-card);max-width:240px;
}
.hero-badge-card .bc-title{font-weight:700;font-size:16px;color:var(--c-text)}
.hero-badge-card .bc-desc{font-size:13px;color:var(--c-text-muted);margin-top:4px}
.hero-badge-card .bc-btn{display:inline-flex;align-items:center;gap:4px;font-size:13px;font-weight:600;color:var(--c-primary);margin-top:12px}
.hero-badge-card .bc-btn svg{width:14px;height:14px;transition:transform .2s}
.hero-badge-card .bc-btn:hover svg{transform:translateX(4px)}

/* ===== 板块通用 ===== */
.section{padding:80px 0}
@media(max-width:1024px){.section{padding:56px 0}}
.section:first-of-type{padding-top:40px}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:32px}
.section-head h2{font-size:28px;font-weight:700;color:var(--c-text);letter-spacing:-.3px}
@media(max-width:768px){.section-head h2{font-size:24px}}
.section-head p{color:var(--c-text-muted);font-size:14px;max-width:480px}
.section-link{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--c-primary);white-space:nowrap}
.section-link svg{width:16px;height:16px;transition:transform .2s}
.section-link:hover svg{transform:translateX(4px)}

/* ===== 横滑片库 ===== */
.shelf-track{
  display:flex;gap:20px;overflow-x:auto;padding:4px 4px 20px;
  scroll-snap-type:x mandatory;scrollbar-width:none;
}
.shelf-track::-webkit-scrollbar{display:none}
.shelf-card{
  min-width:232px;max-width:260px;flex:0 0 auto;scroll-snap-align:start;
  background:var(--c-card);border-radius:var(--radius-md);border:1px solid var(--c-border);
  overflow:hidden;box-shadow:var(--shadow-card);
  transition:box-shadow .3s,transform .2s;
}
.shelf-card:hover{box-shadow:var(--shadow-card-hover);transform:translateY(-4px)}
.shelf-card .cover{position:relative;aspect-ratio:16/9;overflow:hidden;background:var(--c-primary-weak)}
.shelf-card .cover img{width:100%;height:100%;object-fit:cover;transition:transform .3s}
.shelf-card:hover .cover img{transform:scale(1.03)}
.shelf-card .sfc-body{padding:16px}
.shelf-card h3{font-size:16px;font-weight:600;color:var(--c-text);margin-bottom:6px}
.shelf-card .sfc-meta{display:flex;align-items:center;justify-content:space-between}
.shelf-card .sfc-tag{font-size:12px;color:var(--c-primary);background:var(--c-primary-weak);padding:3px 10px;border-radius:999px;font-weight:500}
.shelf-card .sfc-arrow{color:var(--c-text-muted);transition:transform .2s,color .2s}
.shelf-card:hover .sfc-arrow{transform:translateX(4px);color:var(--c-primary)}

/* ===== 热播推荐网格 ===== */
.hot-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
@media(max-width:1024px){.hot-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.hot-grid{grid-template-columns:1fr}}
.hot-card{
  position:relative;border-radius:var(--radius-md);overflow:hidden;
  background:var(--c-card);border:1px solid var(--c-border);box-shadow:var(--shadow-card);
  transition:box-shadow .3s,border-color .3s;
}
.hot-card:hover{box-shadow:var(--shadow-card-hover);border-color:var(--c-primary)}
.hot-card:first-child{grid-column:span 2;grid-row:span 2}
@media(max-width:1024px){.hot-card:first-child{grid-column:span 2;min-height:320px}}
@media(max-width:600px){.hot-card:first-child{grid-column:span 1}}
.hot-card .hc-cover{aspect-ratio:16/9;overflow:hidden;background:var(--c-primary-weak)}
.hot-card:first-child .hc-cover{aspect-ratio:auto;height:100%;min-height:280px}
.hot-card .hc-cover img{width:100%;height:100%;object-fit:cover}
.hot-card:first-child .hc-overlay{
  position:absolute;inset:0;background:linear-gradient(180deg,transparent 35%,rgba(22,36,61,.85) 100%);
  display:flex;flex-direction:column;justify-content:flex-end;padding:24px;
}
.hot-card:first-child .hc-overlay h3{color:#fff;font-size:24px;font-weight:700}
.hot-card:first-child .hc-overlay p{color:rgba(255,255,255,.85);font-size:14px;margin-top:4px}
.hot-card:first-child .hc-overlay .btn-ghost{margin-top:14px;border-color:#fff;color:#fff;padding:6px 16px;min-height:36px;font-size:13px}
.hot-card .hc-body{padding:14px 16px}
.hot-card .hc-body h3{font-size:16px;font-weight:600;color:var(--c-text)}
.hot-card .hc-body .hc-time{font-size:13px;color:var(--c-text-muted);margin-top:2px}
.hot-badge{
  position:absolute;top:12px;left:12px;background:var(--c-accent);color:#fff;
  font-size:11px;font-weight:700;padding:3px 10px;border-radius:var(--radius-sm);letter-spacing:.05em;z-index:2;
}
.new-badge{
  position:absolute;top:12px;left:12px;background:var(--c-primary-weak);color:var(--c-primary);
  font-size:11px;font-weight:700;padding:3px 10px;border-radius:var(--radius-sm);z-index:2;
}

/* ===== 片单分区 ===== */
.playlist-row{display:grid;grid-template-columns:1.2fr 1fr .9fr;gap:24px;align-items:start}
@media(max-width:1024px){.playlist-row{grid-template-columns:1fr}}
.playlist-col{margin-top:12px}
.playlist-col:nth-child(2){margin-top:24px}
.playlist-col h3{font-size:18px;font-weight:700;color:var(--c-text);margin-bottom:14px;display:flex;align-items:center;gap:8px}
.playlist-col h3 .pl-dot{width:6px;height:6px;border-radius:50%;background:var(--c-accent)}
.playlist-item{
  display:flex;align-items:center;gap:14px;padding:10px 12px;border-radius:var(--radius-md);
  transition:background .2s;border-bottom:1px solid var(--c-border);
}
.playlist-item:last-child{border-bottom:0}
.playlist-item:hover{background:rgba(232,240,254,.5)}
.playlist-item .pl-thumb{width:72px;height:72px;border-radius:var(--radius-md);overflow:hidden;flex-shrink:0;background:var(--c-primary-weak)}
.playlist-item .pl-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s}
.playlist-item:hover .pl-thumb img{transform:scale(1.05)}
.playlist-item .pl-info{flex:1;min-width:0}
.playlist-item .pl-info h4{font-size:15px;font-weight:600;color:var(--c-text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.playlist-item .pl-info p{font-size:13px;color:var(--c-text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:2px}
.playlist-item time{font-size:12px;color:var(--c-text-muted);flex-shrink:0}

/* ===== 资讯列表 CMS ===== */
.news-section .section-inner{background:#fff;border:1px solid var(--c-border);border-radius:var(--radius-lg);padding:32px;box-shadow:var(--shadow-card)}
@media(max-width:768px){.news-section .section-inner{padding:20px}}
.news-item{
  display:flex;align-items:flex-start;gap:16px;padding:16px 0;
  border-bottom:1px solid var(--c-border);transition:background .2s,padding-left .2s;
}
.news-item:last-child{border-bottom:0}
.news-item:hover{padding-left:8px;background:rgba(245,248,252,.6)}
.news-badge{
  flex-shrink:0;display:inline-block;font-size:12px;font-weight:600;
  background:var(--c-primary-weak);color:var(--c-primary);padding:3px 10px;border-radius:var(--radius-sm);
  margin-top:4px;white-space:nowrap;
}
.news-main{flex:1;min-width:0}
.news-main h3{font-size:17px;font-weight:600;color:var(--c-text);line-height:1.5;margin-bottom:4px;transition:color .2s}
.news-item:hover .news-main h3{color:var(--c-primary)}
.news-main p{
  font-size:14px;color:var(--c-text-muted);line-height:1.6;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.news-time{flex-shrink:0;font-size:13px;color:var(--c-text-muted);margin-top:4px;white-space:nowrap}
@media(max-width:600px){
  .news-item{flex-wrap:wrap}
  .news-time{width:100%;padding-left:0;margin-top:0}
}
.news-empty{
  text-align:center;padding:48px 20px;color:var(--c-text-muted);
}
.news-empty svg{width:48px;height:48px;margin:0 auto 12px;color:var(--c-primary-weak);stroke:currentColor}
.news-empty p{font-size:14px}
.news-empty .btn-ghost{margin-top:16px;min-height:38px;padding:6px 18px;font-size:14px}

/* ===== FAQ ===== */
.faq-wrap{max-width:860px;margin:0 auto}
.faq-item{
  background:var(--c-card);border:1px solid var(--c-border);border-radius:var(--radius-md);
  margin-bottom:14px;overflow:hidden;transition:box-shadow .2s;
}
.faq-item:hover{box-shadow:var(--shadow-card)}
.faq-item summary{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 22px;font-weight:500;font-size:15px;color:var(--c-text);
  cursor:pointer;list-style:none;transition:background .2s;
}
.faq-item summary:hover{background:var(--c-primary-weak)}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item .faq-icon{
  width:26px;height:26px;border-radius:50%;background:var(--c-primary-weak);color:var(--c-primary);
  display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:transform .3s;
}
.faq-item details[open] .faq-icon{transform:rotate(45deg)}
.faq-item .faq-body{padding:0 22px 18px;font-size:14px;color:var(--c-text-body);line-height:1.75}
.faq-item .faq-body p{margin-bottom:8px}
.faq-item .faq-body p:last-child{margin-bottom:0}

/* ===== CTA ===== */
.cta-banner{
  background:var(--c-primary-weak);border-radius:var(--radius-xl);
  padding:48px;display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;
  position:relative;overflow:hidden;
}
.cta-banner::after{
  content:"";position:absolute;right:-60px;top:-60px;width:220px;height:220px;border-radius:50%;
  background:rgba(27,110,245,.06);
}
@media(max-width:768px){.cta-banner{padding:32px 28px}}
.cta-banner h2{font-size:26px;font-weight:700;color:var(--c-text);margin-bottom:8px}
@media(max-width:768px){.cta-banner h2{font-size:22px}}
.cta-banner p{color:var(--c-text-body);max-width:460px;font-size:15px}
.cta-banner .cta-actions{display:flex;gap:14px;flex-wrap:wrap}

/* ===== Footer ===== */
.site-footer{background:var(--c-dark-bg);color:rgba(255,255,255,.7);padding-top:64px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr 1fr;gap:40px;margin-bottom:48px}
@media(max-width:992px){.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.footer-grid{grid-template-columns:1fr}}
.footer-brand .footer-logo{color:#fff;font-size:22px;font-weight:800;display:flex;align-items:center;gap:10px}
.footer-brand .footer-logo .logo-mark{
  width:34px;height:34px;border-radius:10px;background:var(--c-primary);
  display:flex;align-items:center;justify-content:center;color:#fff;font-size:16px;font-weight:800;
}
.footer-brand p{font-size:14px;line-height:1.7;margin-top:14px;max-width:280px;color:rgba(255,255,255,.6)}
.footer-col h4{color:#fff;font-size:15px;font-weight:600;margin-bottom:16px}
.footer-col ul li{margin-bottom:10px}
.footer-col a{font-size:14px;color:rgba(255,255,255,.7);transition:color .2s}
.footer-col a:hover{color:#fff}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1);padding-top:20px;
  display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;
  font-size:13px;color:rgba(255,255,255,.5);
}
@media(max-width:600px){.footer-bottom{flex-direction:column;text-align:center}}

/* ===== 通用工具 ===== */
.hidden-md{display:block}
@media(max-width:992px){.hidden-md{display:none}}
.visible-md{display:none}
@media(max-width:992px){.visible-md{display:block}}

section[id]{scroll-margin-top:90px}
@media(prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important;scroll-behavior:auto!important}
}

/* roulang page: category1 */
:root {
            --c-primary: #1B6EF5;
            --c-primary-weak: #E8F0FE;
            --c-accent: #FF6B35;
            --c-page: #F5F8FC;
            --c-card: #FFFFFF;
            --c-text: #16243D;
            --c-text-body: #3D4A5C;
            --c-text-muted: #7C8BA1;
            --c-border: #E4EAF2;
            --c-success: #14B07B;
            --c-warning: #E5A800;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-card: 0 2px 8px rgba(22,36,61,0.06);
            --shadow-hover: 0 12px 28px rgba(22,36,61,0.12);
            --shadow-nav: 0 4px 16px rgba(22,36,61,0.08);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            font-size: 16px;
            line-height: 1.75;
            color: var(--c-text-body);
            background: var(--c-page);
            -webkit-font-smoothing: antialiased;
        }

        h1,
        h2,
        h3,
        h4 {
            color: var(--c-text);
            line-height: 1.3;
            font-weight: 700;
        }

        h1 {
            font-size: 40px;
            letter-spacing: -0.5px;
        }
        h2 {
            font-size: 28px;
            letter-spacing: -0.3px;
        }
        h3 {
            font-size: 20px;
            font-weight: 600;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        a,
        button {
            transition: all .2s ease;
        }

        a:focus-visible,
        button:focus-visible {
            outline: 2px solid var(--c-primary);
            outline-offset: 2px;
        }

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

        .container-site {
            max-width: 1280px;
            margin: 0 auto;
            padding-left: 48px;
            padding-right: 48px;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.96);
            border-bottom: 1px solid var(--c-border);
            box-shadow: var(--shadow-nav);
        }

        .nav-wrap {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            gap: 24px;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-shrink: 0;
        }

        .logo-mark {
            width: 38px;
            height: 38px;
            border-radius: 10px;
            background: var(--c-primary);
            color: #fff;
            font-size: 20px;
            font-weight: 700;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            text-transform: lowercase;
        }

        .nav-logo>span:last-child {
            font-size: 20px;
            font-weight: 700;
            color: var(--c-primary);
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
            flex: 1;
            justify-content: center;
        }

        .nav-link {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 8px 14px;
            font-size: 15px;
            font-weight: 500;
            color: var(--c-text-body);
            border-radius: var(--radius-sm);
            white-space: nowrap;
        }

        .nav-link:hover {
            background: var(--c-primary-weak);
            color: var(--c-primary);
        }

        .nav-link.active {
            color: var(--c-primary);
            font-weight: 600;
            background: var(--c-primary-weak);
        }

        .mega-trigger {
            position: relative;
        }

        .mega-panel {
            position: absolute;
            top: 48px;
            left: 50%;
            transform: translateX(-50%) translateY(8px);
            width: 620px;
            background: #fff;
            border: 1px solid var(--c-border);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-hover);
            padding: 20px;
            display: grid;
            grid-template-columns: 1fr 1fr 280px;
            gap: 20px;
            opacity: 0;
            visibility: hidden;
            pointer-events: none;
            transition: all .25s ease;
            z-index: 110;
        }

        .mega-trigger:hover .mega-panel,
        .mega-trigger:focus-within .mega-panel {
            opacity: 1;
            visibility: visible;
            pointer-events: auto;
            transform: translateX(-50%) translateY(0);
        }

        .mega-panel h4 {
            font-size: 14px;
            color: var(--c-text-muted);
            margin-bottom: 10px;
            font-weight: 600;
        }

        .mega-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .mega-list a {
            font-size: 14px;
            color: var(--c-text-body);
            display: block;
            padding: 5px 8px;
            border-radius: var(--radius-sm);
        }

        .mega-list a:hover {
            background: var(--c-primary-weak);
            color: var(--c-primary);
        }

        .mega-card {
            background: var(--c-primary-weak);
            border-radius: var(--radius-md);
            padding: 16px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .mega-card p {
            font-size: 13px;
            line-height: 1.6;
        }

        .nav-cta {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }

        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: var(--c-text);
            padding: 6px;
            border-radius: var(--radius-sm);
            cursor: pointer;
        }

        .nav-toggle:hover {
            background: var(--c-primary-weak);
        }

        /* ===== Buttons ===== */
        .btn-accent {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
            background: var(--c-accent);
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            min-height: 44px;
            padding: 10px 24px;
            border-radius: var(--radius-sm);
            border: none;
            cursor: pointer;
            box-shadow: 0 2px 6px rgba(255, 107, 53, 0.24);
            white-space: nowrap;
        }

        .btn-accent:hover {
            filter: brightness(1.06);
            box-shadow: 0 4px 14px rgba(255, 107, 53, 0.32);
        }

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

        .btn-ghost {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
            background: #fff;
            color: var(--c-primary);
            border: 2px solid var(--c-primary);
            font-size: 15px;
            font-weight: 600;
            min-height: 44px;
            padding: 9px 22px;
            border-radius: var(--radius-sm);
            cursor: pointer;
            white-space: nowrap;
        }

        .btn-ghost:hover {
            background: var(--c-primary-weak);
        }

        .btn-ghost:active {
            background: #d9e6fb;
            transform: translateY(1px);
        }

        .btn-ghost-light {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.85);
            font-size: 15px;
            font-weight: 600;
            min-height: 44px;
            padding: 9px 22px;
            border-radius: var(--radius-sm);
            cursor: pointer;
            white-space: nowrap;
        }

        .btn-ghost-light:hover {
            background: rgba(255, 255, 255, 0.12);
        }

        /* ===== Category Hero ===== */
        .cat-hero {
            background: linear-gradient(120deg, var(--c-primary-weak) 0%, #f0f6ff 55%, #ffffff 100%);
            border-bottom: 1px solid var(--c-border);
            overflow: hidden;
        }

        .cat-hero-grid {
            display: grid;
            grid-template-columns: 1.15fr 0.85fr;
            align-items: center;
            gap: 48px;
            padding: 80px 0 72px;
        }

        .cat-hero .tag {
            display: inline-flex;
            align-items: center;
            background: var(--c-primary);
            color: #fff;
            font-size: 13px;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 999px;
            margin-bottom: 18px;
            letter-spacing: 0.5px;
        }

        .cat-hero h1 {
            font-size: 42px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .cat-hero-desc {
            font-size: 17px;
            line-height: 1.75;
            color: var(--c-text-body);
            max-width: 520px;
            margin-bottom: 28px;
        }

        .hero-cta {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
            margin-bottom: 28px;
        }

        .trust-marks {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
        }

        .trust-marks span {
            font-size: 13px;
            color: var(--c-text-muted);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .trust-marks span svg {
            color: var(--c-primary);
        }

        .cat-hero-visual {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-hover);
            min-height: 280px;
        }

        .cat-hero-visual img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            min-height: 280px;
        }

        /* ===== Sections ===== */
        .section {
            padding: 80px 0;
        }

        .section+.section {
            padding-top: 0;
        }

        .section-head {
            margin-bottom: 40px;
            max-width: 720px;
        }

        .section-head h2 {
            margin-bottom: 8px;
        }

        .section-head p {
            color: var(--c-text-muted);
            font-size: 16px;
        }

        /* ===== Channel Cards ===== */
        .channel-grid {
            display: grid;
            grid-template-columns: 1.2fr 1fr 1fr;
            gap: 24px;
            align-items: stretch;
        }

        .channel-card {
            background: var(--c-card);
            border: 1px solid var(--c-border);
            border-radius: var(--radius-lg);
            padding: 28px;
            position: relative;
            box-shadow: var(--shadow-card);
            display: flex;
            flex-direction: column;
            transition: box-shadow .25s ease, border-color .25s ease;
        }

        .channel-card:hover {
            border-color: var(--c-primary);
            box-shadow: var(--shadow-hover);
        }

        .channel-card.primary-card {
            background: linear-gradient(145deg, #ffffff 0%, var(--c-primary-weak) 100%);
            border-color: rgba(27, 110, 245, 0.25);
        }

        .tag-hot {
            position: absolute;
            top: -12px;
            left: 24px;
            background: var(--c-accent);
            color: #fff;
            font-size: 12px;
            font-weight: 600;
            padding: 3px 12px;
            border-radius: 999px;
        }

        .channel-card h3 {
            margin-bottom: 6px;
        }

        .channel-card .channel-desc {
            font-size: 14px;
            color: var(--c-text-muted);
            margin-bottom: 18px;
        }

        .channel-card ul {
            list-style: none;
            margin-bottom: 22px;
            flex: 1;
        }

        .channel-card ul li {
            font-size: 14px;
            color: var(--c-text-body);
            padding: 6px 0;
            border-bottom: 1px dashed var(--c-border);
            display: flex;
            justify-content: space-between;
            gap: 8px;
        }

        .channel-card ul li:last-child {
            border-bottom: none;
        }

        .channel-card ul li .label {
            color: var(--c-text-muted);
        }

        .channel-card ul li .value {
            font-weight: 600;
            color: var(--c-text);
        }

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

        .step-item {
            background: var(--c-card);
            border: 1px solid var(--c-border);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            position: relative;
            box-shadow: var(--shadow-card);
            transition: transform .2s ease, box-shadow .2s ease;
        }

        .step-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }

        .step-num {
            width: 46px;
            height: 46px;
            border-radius: 50%;
            background: var(--c-primary-weak);
            color: var(--c-primary);
            font-size: 18px;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 16px;
        }

        .step-item h3 {
            font-size: 17px;
            margin-bottom: 8px;
        }

        .step-item p {
            font-size: 14px;
            line-height: 1.7;
            color: var(--c-text-body);
        }

        /* ===== Scroll Track ===== */
        .scroll-track {
            display: flex;
            gap: 20px;
            overflow-x: auto;
            padding: 8px 4px 20px;
            scroll-snap-type: x mandatory;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
        }

        .scroll-track::-webkit-scrollbar {
            display: none;
        }

        .scroll-card {
            flex: 0 0 240px;
            scroll-snap-align: start;
            background: var(--c-card);
            border: 1px solid var(--c-border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: box-shadow .25s ease, transform .25s ease;
        }

        .scroll-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-3px);
        }

        .scroll-card .cover {
            position: relative;
            overflow: hidden;
            aspect-ratio: 16/10;
            background: var(--c-primary-weak);
        }

        .scroll-card .cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .3s ease;
        }

        .scroll-card:hover .cover img {
            transform: scale(1.03);
        }

        .scroll-card .cover .badge {
            position: absolute;
            top: 12px;
            left: 12px;
            background: var(--c-accent);
            color: #fff;
            font-size: 12px;
            font-weight: 600;
            padding: 3px 10px;
            border-radius: var(--radius-sm);
        }

        .scroll-card .body {
            padding: 16px;
        }

        .scroll-card .body h3 {
            font-size: 16px;
            margin-bottom: 6px;
            line-height: 1.4;
        }

        .scroll-card .body .meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 13px;
            color: var(--c-text-muted);
        }

        /* ===== News / Version List ===== */
        .news-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }

        .news-card {
            background: var(--c-card);
            border: 1px solid var(--c-border);
            border-radius: var(--radius-md);
            padding: 24px;
            display: flex;
            gap: 18px;
            transition: box-shadow .2s ease, border-color .2s ease;
        }

        .news-card:hover {
            border-color: var(--c-primary);
            box-shadow: var(--shadow-hover);
        }

        .news-card .thumb {
            width: 96px;
            height: 72px;
            border-radius: var(--radius-md);
            overflow: hidden;
            flex-shrink: 0;
            background: var(--c-primary-weak);
        }

        .news-card .thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .news-card .info {
            flex: 1;
        }

        .news-card .info .badge {
            display: inline-block;
            background: var(--c-primary-weak);
            color: var(--c-primary);
            font-size: 12px;
            font-weight: 600;
            padding: 2px 10px;
            border-radius: var(--radius-sm);
            margin-bottom: 6px;
        }

        .news-card .info h3 {
            font-size: 16px;
            margin-bottom: 4px;
            line-height: 1.4;
        }

        .news-card .info .desc {
            font-size: 13px;
            color: var(--c-text-muted);
            line-height: 1.5;
            overflow: hidden;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
        }

        .news-card .info .time {
            font-size: 12px;
            color: var(--c-text-muted);
            margin-top: 8px;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 820px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .faq-item {
            background: var(--c-card);
            border: 1px solid var(--c-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color .2s ease;
        }

        .faq-item:hover {
            border-color: var(--c-primary);
        }

        .faq-item summary {
            cursor: pointer;
            font-size: 15px;
            font-weight: 500;
            color: var(--c-text);
            padding: 18px 20px;
            list-style: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
        }

        .faq-item summary::-webkit-details-marker {
            display: none;
        }

        .faq-item summary .faq-icon {
            width: 24px;
            height: 24px;
            border-radius: 50%;
            border: 2px solid var(--c-primary);
            color: var(--c-primary);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            font-weight: 700;
            flex-shrink: 0;
            transition: transform .25s ease;
        }

        .faq-item[open] summary .faq-icon {
            transform: rotate(45deg);
            background: var(--c-primary);
            color: #fff;
        }

        .faq-item .faq-body {
            padding: 0 20px 18px;
            font-size: 14px;
            line-height: 1.75;
            color: var(--c-text-body);
            border-top: 1px solid var(--c-border);
            padding-top: 14px;
        }

        /* ===== CTA Banner ===== */
        .cta-banner {
            background: var(--c-primary-weak);
            border-radius: var(--radius-xl);
            padding: 56px 48px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 40px;
            position: relative;
            overflow: hidden;
        }

        .cta-banner::after {
            content: "";
            position: absolute;
            right: -60px;
            top: -60px;
            width: 240px;
            height: 240px;
            background: rgba(27, 110, 245, 0.08);
            border-radius: 50%;
        }

        .cta-banner .cta-text h2 {
            font-size: 30px;
            margin-bottom: 8px;
        }

        .cta-banner .cta-text p {
            color: var(--c-text-body);
            font-size: 15px;
        }

        .cta-banner .cta-buttons {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
            flex-shrink: 0;
            position: relative;
            z-index: 1;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #0B1B32;
            color: rgba(255, 255, 255, 0.7);
            margin-top: 80px;
        }

        .site-footer .container-site {
            padding-top: 56px;
            padding-bottom: 32px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr repeat(4, 1fr);
            gap: 32px;
            margin-bottom: 40px;
        }

        .footer-brand .footer-logo {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 14px;
        }

        .footer-logo .logo-mark {
            background: var(--c-primary);
            color: #fff;
        }

        .footer-logo>span:last-child {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
        }

        .footer-brand p {
            font-size: 13px;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.6);
            max-width: 280px;
        }

        .footer-col h4 {
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            margin-bottom: 14px;
        }

        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-col ul a {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.68);
        }

        .footer-col ul a:hover {
            color: #fff;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.12);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.5);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .container-site {
                padding-left: 32px;
                padding-right: 32px;
            }

            .nav-links {
                gap: 2px;
            }

            .nav-link {
                padding: 8px 10px;
                font-size: 14px;
            }

            .mega-panel {
                width: 560px;
                grid-template-columns: 1fr 1fr 220px;
            }

            .cat-hero-grid {
                gap: 32px;
                padding: 60px 0;
            }

            .cat-hero h1 {
                font-size: 36px;
            }

            .channel-grid {
                grid-template-columns: 1fr 1fr;
            }

            .channel-card.primary-card {
                grid-column: span 2;
            }

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

            .footer-grid {
                grid-template-columns: 1fr 1fr 1fr;
                gap: 28px;
            }

            .footer-brand {
                grid-column: span 2;
            }
        }

        @media (max-width: 768px) {
            .container-site {
                padding-left: 20px;
                padding-right: 20px;
            }

            .site-header {
                position: sticky;
            }

            .nav-wrap {
                height: 64px;
                flex-wrap: wrap;
                gap: 8px;
            }

            .nav-links {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #fff;
                border-bottom: 1px solid var(--c-border);
                padding: 12px 0 16px;
                gap: 4px;
            }

            .nav-links.open {
                display: flex;
            }

            .nav-link {
                width: 100%;
                padding: 10px 16px;
                font-size: 15px;
            }

            .mega-trigger .mega-panel {
                position: static;
                transform: none;
                width: 100%;
                margin-top: 6px;
                border-radius: var(--radius-md);
                box-shadow: none;
                opacity: 1;
                visibility: visible;
                pointer-events: auto;
                grid-template-columns: 1fr;
                gap: 12px;
                padding: 14px;
                display: none;
            }

            .mega-trigger.open .mega-panel {
                display: grid;
            }

            .nav-toggle {
                display: inline-flex;
            }

            .nav-download {
                display: none;
            }

            .cat-hero-grid {
                grid-template-columns: 1fr;
                padding: 48px 0 40px;
            }

            .cat-hero h1 {
                font-size: 30px;
            }

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

            .cat-hero-visual {
                min-height: 200px;
                order: -1;
            }

            .cat-hero-visual img {
                min-height: 200px;
            }

            .section {
                padding: 56px 0;
            }

            .section-head {
                margin-bottom: 24px;
            }

            .channel-grid {
                grid-template-columns: 1fr;
            }

            .channel-card.primary-card {
                grid-column: span 1;
            }

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

            .news-list {
                grid-template-columns: 1fr;
            }

            .faq-item summary {
                font-size: 14px;
                padding: 15px 16px;
            }

            .cta-banner {
                flex-direction: column;
                align-items: flex-start;
                padding: 40px 24px;
            }

            .cta-banner .cta-text h2 {
                font-size: 24px;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }

            .footer-brand {
                grid-column: span 2;
            }
        }

        @media (max-width: 520px) {
            .container-site {
                padding-left: 16px;
                padding-right: 16px;
            }

            h1 {
                font-size: 26px;
            }

            h2 {
                font-size: 22px;
            }

            .hero-cta {
                flex-direction: column;
            }

            .hero-cta .btn-accent,
            .hero-cta .btn-ghost {
                width: 100%;
            }

            .channel-card {
                padding: 20px;
            }

            .news-card {
                flex-direction: column;
            }

            .news-card .thumb {
                width: 100%;
                height: 140px;
            }

            .cta-banner .cta-buttons {
                width: 100%;
                flex-direction: column;
            }

            .cta-banner .cta-buttons .btn-accent,
            .cta-banner .cta-buttons .btn-ghost-light {
                width: 100%;
            }

            .footer-grid {
                grid-template-columns: 1fr;
            }

            .footer-brand {
                grid-column: span 1;
            }

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

/* roulang page: article */
:root {
  --c-primary: #1B6EF5;
  --c-primary-weak: #E8F0FE;
  --c-accent: #FF6B35;
  --c-page: #F5F8FC;
  --c-card: #FFFFFF;
  --c-text: #16243D;
  --c-text-body: #3D4A5C;
  --c-text-muted: #7C8BA1;
  --c-border: #E4EAF2;
  --c-success: #14B07B;
  --c-warning: #E5A800;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-card: 0 2px 8px rgba(22,36,61,0.06);
  --shadow-card-hover: 0 12px 28px rgba(22,36,61,0.12);
  --shadow-nav: 0 4px 16px rgba(22,36,61,0.08);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  background: var(--c-page);
  color: var(--c-text-body);
  -webkit-font-smoothing: antialiased;
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.2s ease;
}

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

button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--c-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.container-site {
  max-width: 1280px;
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

@media (min-width: 768px) {
  .container-site {
    padding-left: 32px;
    padding-right: 32px;
  }
}

@media (min-width: 1280px) {
  .container-site {
    padding-left: 48px;
    padding-right: 48px;
  }
}

/* ========== Header / Nav ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--c-border);
  box-shadow: var(--shadow-nav);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
  gap: 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 24px;
  font-weight: 800;
  color: var(--c-primary);
  letter-spacing: -0.5px;
  white-space: nowrap;
}

.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: var(--c-primary);
  color: #fff;
  border-radius: 10px;
  font-size: 22px;
  font-weight: 800;
  box-shadow: 0 4px 10px rgba(27,110,245,0.28);
}

.nav-links {
  display: none;
  align-items: center;
  gap: 4px;
}

@media (min-width: 1024px) {
  .nav-links {
    display: flex;
    flex: 1;
    justify-content: center;
    gap: 6px;
  }
}

.nav-link {
  display: inline-block;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 500;
  color: var(--c-text-body);
  white-space: nowrap;
  transition: background 0.2s, color 0.2s;
}

.nav-link:hover {
  background: var(--c-primary-weak);
  color: var(--c-primary);
}

.nav-link.active {
  color: var(--c-primary);
  font-weight: 600;
  background: var(--c-primary-weak);
}

.nav-links.open {
  display: flex;
  flex-direction: column;
  width: 100%;
  position: absolute;
  top: 74px;
  left: 0;
  background: #fff;
  padding: 20px 24px 28px;
  border-bottom: 1px solid var(--c-border);
  box-shadow: var(--shadow-nav);
  gap: 8px;
}

.nav-links.open .nav-link {
  width: 100%;
  padding: 14px 16px;
  border-radius: var(--radius-md);
}

/* Mega menu */
.mega-trigger {
  position: relative;
}

.mega-trigger > .nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.mega-panel {
  display: none;
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  transform: translateX(-50%);
  width: min(640px, 88vw);
  padding: 24px;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card-hover);
  z-index: 50;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 24px;
}

.mega-trigger:hover .mega-panel,
.mega-trigger .mega-panel.open {
  display: grid;
}

.mega-panel h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: 12px;
}

.mega-list {
  list-style: none;
}

.mega-list li + li {
  margin-top: 8px;
}

.mega-list a {
  display: block;
  padding: 6px 0;
  font-size: 14px;
  color: var(--c-text-body);
  border-radius: var(--radius-sm);
}

.mega-list a:hover {
  color: var(--c-primary);
  background: var(--c-primary-weak);
  padding-left: 8px;
}

.mega-card {
  background: var(--c-primary-weak);
  border-radius: var(--radius-md);
  padding: 18px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
}

.btn-accent {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 24px;
  background: var(--c-accent);
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: filter 0.2s, box-shadow 0.2s, transform 0.1s;
  white-space: nowrap;
}

.btn-accent:hover {
  filter: brightness(1.06);
  box-shadow: 0 4px 14px rgba(255,107,53,0.32);
  color: #fff;
}

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

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 24px;
  background: #fff;
  color: var(--c-primary);
  font-size: 15px;
  font-weight: 600;
  border: 2px solid var(--c-primary);
  border-radius: var(--radius-sm);
  transition: background 0.2s, transform 0.1s;
  white-space: nowrap;
}

.btn-ghost:hover {
  background: var(--c-primary-weak);
  color: var(--c-primary);
}

.btn-ghost:active {
  background: #dbe9fb;
  transform: translateY(1px);
}

.btn-lg {
  padding: 14px 34px;
  font-size: 16px;
}

.nav-download {
  display: none;
}

@media (min-width: 1024px) {
  .nav-download {
    display: inline-flex;
  }
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  color: var(--c-text-body);
  transition: background 0.2s;
}

.nav-toggle:hover {
  background: var(--c-primary-weak);
  color: var(--c-primary);
}

.nav-toggle:active {
  transform: scale(0.97);
}

@media (min-width: 1024px) {
  .nav-toggle {
    display: none;
  }
}

/* ========== Breadcrumb ========== */
.breadcrumb {
  padding-top: 28px;
  padding-bottom: 8px;
  font-size: 14px;
  color: var(--c-text-muted);
}

.breadcrumb a {
  color: var(--c-text-muted);
  transition: color 0.2s;
}

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

.breadcrumb .crumb-current {
  color: var(--c-text-body);
  font-weight: 500;
}

/* ========== Article Main ========== */
.article-main {
  padding: 24px 0 48px;
}

@media (min-width: 768px) {
  .article-main {
    padding: 32px 0 64px;
  }
}

.post-card {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  box-shadow: var(--shadow-card);
  max-width: 860px;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .post-card {
    padding: 48px 56px;
  }
}

.post-title {
  font-size: 30px;
  font-weight: 700;
  color: var(--c-text);
  line-height: 1.3;
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}

@media (min-width: 768px) {
  .post-title {
    font-size: 38px;
  }
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  padding-bottom: 24px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--c-border);
}

.badge-cat {
  display: inline-block;
  padding: 5px 14px;
  background: var(--c-primary-weak);
  color: var(--c-primary);
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--radius-sm);
}

.post-meta time {
  font-size: 14px;
  color: var(--c-text-muted);
}

.post-content {
  max-width: 720px;
  margin: 0 auto;
}

.post-content h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--c-text);
  margin: 40px 0 14px;
  line-height: 1.4;
}

.post-content h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--c-text);
  margin: 32px 0 12px;
  line-height: 1.4;
}

.post-content p {
  margin-bottom: 16px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-text-body);
}

.post-content img {
  border-radius: var(--radius-md);
  margin: 24px 0;
  width: 100%;
  height: auto;
}

.post-content ul,
.post-content ol {
  margin: 16px 0 24px;
  padding-left: 24px;
}

.post-content li {
  margin-bottom: 8px;
  line-height: 1.75;
}

.post-content blockquote {
  margin: 24px 0;
  padding: 18px 22px;
  background: var(--c-primary-weak);
  border-left: 4px solid var(--c-primary);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--c-text);
  font-size: 15px;
  line-height: 1.7;
}

.post-content a {
  color: var(--c-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.post-content a:hover {
  text-decoration-thickness: 2px;
}

/* ========== Post Empty ========== */
.post-empty {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 64px 24px;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
  box-shadow: var(--shadow-card);
}

.post-empty h1 {
  font-size: 24px;
  color: var(--c-text);
  margin-bottom: 12px;
}

.post-empty p {
  color: var(--c-text-muted);
  margin-bottom: 24px;
}

/* ========== Related ========== */
.related-section {
  padding: 48px 0 56px;
  background: var(--c-page);
}

@media (min-width: 1024px) {
  .related-section {
    padding: 80px 0 80px;
  }
}

.related-section .section-head {
  text-align: center;
  margin-bottom: 36px;
}

.related-section .section-head h2 {
  font-size: 28px;
  font-weight: 700;
  color: var(--c-text);
}

.related-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 768px) {
  .related-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
}

.related-card {
  display: flex;
  flex-direction: column;
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: box-shadow 0.3s, transform 0.3s, border-color 0.3s;
}

.related-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-4px);
  border-color: var(--c-primary);
}

.related-thumb {
  overflow: hidden;
  aspect-ratio: 16 / 9;
}

.related-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s;
}

.related-card:hover .related-thumb img {
  transform: scale(1.03);
}

.related-info {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.related-info h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--c-text);
  line-height: 1.5;
}

.related-card:hover .related-info h3 {
  color: var(--c-primary);
}

.related-date {
  font-size: 13px;
  color: var(--c-text-muted);
  margin-top: auto;
}

/* ========== FAQ ========== */
.faq-section {
  padding: 48px 0;
}

@media (min-width: 1024px) {
  .faq-section {
    padding: 80px 0;
  }
}

.faq-section .container-site {
  max-width: 860px;
}

.faq-head {
  text-align: center;
  margin-bottom: 36px;
}

.faq-head h2 {
  font-size: 28px;
  font-weight: 700;
  color: var(--c-text);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-item {
  background: var(--c-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow 0.25s, border-color 0.25s;
}

.faq-item:hover {
  border-color: var(--c-primary);
  box-shadow: var(--shadow-card);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 22px;
  font-size: 15px;
  font-weight: 500;
  color: var(--c-text);
  cursor: pointer;
  list-style: none;
  transition: background 0.2s;
}

.faq-item summary:hover {
  background: var(--c-primary-weak);
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: '+';
  font-size: 22px;
  font-weight: 400;
  color: var(--c-primary);
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--c-primary-weak);
  transition: transform 0.25s;
}

.faq-item[open] summary::after {
  content: '−';
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 22px 20px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--c-text-body);
}

/* ========== CTA ========== */
.cta-section {
  padding: 0 0 64px;
}

@media (min-width: 1024px) {
  .cta-section {
    padding: 0 0 96px;
  }
}

.cta-inner {
  background: var(--c-primary-weak);
  border-radius: var(--radius-xl);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 28px;
  text-align: center;
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(27,110,245,0.12);
}

@media (min-width: 768px) {
  .cta-inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
    padding: 56px 64px;
  }
}

.cta-inner::before {
  content: '';
  position: absolute;
  top: -80px;
  right: -40px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: rgba(27,110,245,0.06);
  pointer-events: none;
}

.cta-text h2 {
  font-size: 28px;
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 10px;
}

.cta-text p {
  font-size: 16px;
  color: var(--c-text-body);
  max-width: 480px;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
  flex-shrink: 0;
}

/* ========== Footer ========== */
.site-footer {
  background: #0B1B32;
  color: rgba(255,255,255,0.7);
  padding: 64px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-bottom: 40px;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    gap: 40px;
  }
}

.footer-brand {
  grid-column: 1 / -1;
}

@media (min-width: 768px) {
  .footer-brand {
    grid-column: auto;
  }
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 14px;
}

.footer-logo .logo-mark {
  width: 32px;
  height: 32px;
  font-size: 18px;
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255,255,255,0.6);
  max-width: 260px;
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 14px;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 8px;
}

.footer-col a {
  font-size: 14px;
  color: rgba(255,255,255,0.7);
  transition: color 0.2s, padding-left 0.2s;
}

.footer-col a:hover {
  color: #fff;
  padding-left: 4px;
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-align: center;
  padding-top: 28px;
  border-top: 1px solid rgba(255,255,255,0.12);
  font-size: 13px;
  color: rgba(255,255,255,0.5);
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

/* ========== Back Top ========== */
.back-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 90;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  background: var(--c-primary);
  color: #fff;
  font-size: 18px;
  border-radius: 50%;
  box-shadow: 0 6px 18px rgba(27,110,245,0.35);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s, transform 0.3s, visibility 0.3s;
}

.back-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-top:hover {
  background: #1559d0;
  color: #fff;
  transform: translateY(-2px);
}

.back-top:active {
  transform: scale(0.97);
}

/* ========== Responsive ========== */
@media (max-width: 520px) {
  .post-card {
    padding: 24px 16px;
  }

  .post-title {
    font-size: 26px;
  }

  .cta-actions .btn-accent,
  .cta-actions .btn-ghost {
    width: 100%;
  }

  .faq-item summary {
    font-size: 14px;
  }

  .related-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 375px) {
  .nav-logo {
    font-size: 20px;
  }

  .nav-logo .logo-mark {
    width: 32px;
    height: 32px;
    font-size: 18px;
  }

  .btn-accent {
    padding: 8px 16px;
  }

  .post-title {
    font-size: 22px;
  }
}