/*==============================================
  91在线视频 · 主样式
  字体：系统栈，零外链
==============================================*/
:root{
  --c-primary:#d1001f;
  --c-primary-dark:#a50018;
  --c-bg:#0d0d0d;
  --c-bg2:#161616;
  --c-bg3:#1e1e1e;
  --c-text:#e8e8e8;
  --c-muted:#999;
  --c-border:#2a2a2a;
  --c-accent:#ff3a5c;
  --radius:8px;
  --shadow:0 2px 16px rgba(0,0,0,.6);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{
  background:var(--c-bg);
  color:var(--c-text);
  font-family:"Segoe UI",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  line-height:1.7;
  min-height:100vh;
}
a{color:var(--c-accent);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}
h1,h2,h3,h4{font-weight:700;line-height:1.3}

/* ---- 顶部通知栏 ---- */
.topbar{
  background:var(--c-primary);
  text-align:center;
  padding:6px 16px;
  font-size:.85rem;
  letter-spacing:.03em;
}
.topbar a{color:#fff;font-weight:600}

/* ---- 导航 ---- */
.site-header{
  background:var(--c-bg2);
  border-bottom:1px solid var(--c-border);
  position:sticky;top:0;z-index:100;
}
.nav-inner{
  max-width:1200px;margin:0 auto;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 20px;height:60px;
}
.logo{font-size:1.4rem;font-weight:800;color:#fff;letter-spacing:-.5px}
.logo span{color:var(--c-primary)}
.nav-links{display:flex;gap:8px;list-style:none}
.nav-links a{
  padding:6px 14px;border-radius:20px;
  color:var(--c-text);font-size:.9rem;
  transition:background .2s,color .2s;
}
.nav-links a:hover,.nav-links a[aria-current="page"]{
  background:var(--c-primary);color:#fff;text-decoration:none;
}
.nav-search input{
  background:var(--c-bg3);border:1px solid var(--c-border);
  color:var(--c-text);border-radius:20px;
  padding:6px 16px;font-size:.9rem;width:180px;
}
.nav-search input:focus{outline:2px solid var(--c-primary)}

/* 汉堡（移动端） */
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px;color:#fff;font-size:1.4rem}

/* ---- 主内容 ---- */
main{max-width:1200px;margin:0 auto;padding:0 20px 40px}

/* ---- 英雄区 ---- */
.hero{
  position:relative;overflow:hidden;
  border-radius:var(--radius);
  margin:24px 0 32px;
  background:linear-gradient(135deg,#1a0008 0%,#0d0d0d 60%,#0a0010 100%);
  display:grid;grid-template-columns:1fr 1fr;align-items:center;
  min-height:380px;padding:40px;gap:32px;
}
.hero::before{
  content:"";position:absolute;inset:0;
  background:radial-gradient(ellipse at 20% 50%,rgba(209,0,31,.18) 0%,transparent 70%);
  pointer-events:none;
}
.hero-text{position:relative;z-index:1}
.hero-eyebrow{
  display:inline-block;background:var(--c-primary);
  color:#fff;font-size:.78rem;font-weight:700;
  padding:3px 10px;border-radius:4px;
  text-transform:uppercase;letter-spacing:.06em;margin-bottom:16px;
}
.hero h1{font-size:2.4rem;line-height:1.2;margin-bottom:12px;color:#fff}
.hero h1 em{color:var(--c-accent);font-style:normal}
.hero-desc{color:var(--c-muted);font-size:1rem;margin-bottom:24px;max-width:440px}
.hero-badges{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:20px}
.badge{
  display:inline-flex;align-items:center;gap:5px;
  background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.12);
  border-radius:20px;padding:4px 12px;font-size:.8rem;
}
.badge svg{width:14px;height:14px;flex-shrink:0}
.hero-stats{display:flex;gap:24px;margin-bottom:28px}
.hero-stat span{display:block}
.hero-stat .num{font-size:1.5rem;font-weight:800;color:#fff}
.hero-stat .lbl{font-size:.78rem;color:var(--c-muted)}
.btn-primary{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--c-primary);color:#fff;
  border-radius:6px;padding:12px 28px;font-size:1rem;font-weight:700;
  border:none;cursor:pointer;transition:background .2s,transform .1s;
}
.btn-primary:hover{background:var(--c-primary-dark);text-decoration:none;transform:translateY(-1px)}
.hero-image{position:relative;z-index:1}
.hero-image figure{border-radius:12px;overflow:hidden;box-shadow:var(--shadow)}

/* ---- 频道胶囊 ---- */
.channel-nav{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:32px}
.channel-nav a{
  background:var(--c-bg3);border:1px solid var(--c-border);
  color:var(--c-text);border-radius:20px;padding:6px 16px;font-size:.88rem;
  transition:background .2s,color .2s,border-color .2s;
}
.channel-nav a:hover{
  background:var(--c-primary);color:#fff;
  border-color:var(--c-primary);text-decoration:none;
}

/* ---- 板块通用 ---- */
.section-head{
  display:flex;align-items:baseline;justify-content:space-between;
  margin-bottom:20px;
}
.section-head h2{
  font-size:1.3rem;color:#fff;
  border-left:4px solid var(--c-primary);padding-left:12px;
}
.section-head a{font-size:.85rem;color:var(--c-muted)}
.section-head a:hover{color:var(--c-accent)}

/* ---- 视频卡片网格 ---- */
.video-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(200px,1fr));
  gap:16px;margin-bottom:40px;
}
.vcard{
  background:var(--c-bg2);border-radius:var(--radius);
  overflow:hidden;transition:transform .2s,box-shadow .2s;
}
.vcard:hover{transform:translateY(-4px);box-shadow:0 8px 24px rgba(0,0,0,.7)}
.vcard-thumb{position:relative;aspect-ratio:16/9;overflow:hidden}
.vcard-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s}
.vcard:hover .vcard-thumb img{transform:scale(1.05)}
.vcard-dur{
  position:absolute;bottom:6px;right:6px;
  background:rgba(0,0,0,.8);color:#fff;
  font-size:.72rem;padding:2px 6px;border-radius:4px;
}
.vcard-badge{
  position:absolute;top:6px;left:6px;
  background:var(--c-primary);color:#fff;
  font-size:.7rem;font-weight:700;padding:2px 7px;border-radius:4px;
}
.vcard-info{padding:10px}
.vcard-info h3{font-size:.88rem;font-weight:600;color:#fff;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
  margin-bottom:6px;line-height:1.4}
.vcard-meta{font-size:.75rem;color:var(--c-muted);display:flex;justify-content:space-between}

/* ---- 排行榜 ---- */
.rank-list{display:flex;flex-direction:column;gap:10px;margin-bottom:40px}
.rank-item{
  display:grid;grid-template-columns:40px 1fr auto;
  align-items:center;gap:12px;
  background:var(--c-bg2);border-radius:var(--radius);padding:12px 16px;
  border:1px solid var(--c-border);transition:border-color .2s;
}
.rank-item:hover{border-color:var(--c-primary)}
.rank-num{
  font-size:1.2rem;font-weight:800;
  font-variant-numeric:tabular-nums;
  color:var(--c-muted);text-align:center;
}
.rank-item:nth-child(1) .rank-num{color:#ffd700}
.rank-item:nth-child(2) .rank-num{color:#c0c0c0}
.rank-item:nth-child(3) .rank-num{color:#cd7f32}
.rank-info h3{font-size:.9rem;color:#fff;margin-bottom:4px}
.rank-tags{display:flex;gap:6px;flex-wrap:wrap}
.tag-pill{
  background:rgba(209,0,31,.15);color:var(--c-accent);
  border-radius:20px;padding:2px 8px;font-size:.72rem;
}
.rank-score{font-size:1.1rem;font-weight:700;color:var(--c-accent)}

/* ---- 主内容+侧边栏布局 ---- */
.content-aside{display:grid;grid-template-columns:1fr 300px;gap:28px;margin-bottom:40px}
.aside-widget{
  background:var(--c-bg2);border-radius:var(--radius);
  padding:16px;border:1px solid var(--c-border);margin-bottom:20px;
}
.aside-widget h3{
  font-size:.95rem;color:#fff;margin-bottom:14px;
  border-bottom:1px solid var(--c-border);padding-bottom:8px;
}

/* ---- FAQ 手风琴 ---- */
.faq-list{display:flex;flex-direction:column;gap:8px;margin-bottom:40px}
details.faq-item{
  background:var(--c-bg2);border:1px solid var(--c-border);
  border-radius:var(--radius);overflow:hidden;
}
details.faq-item[open]{border-color:var(--c-primary)}
details.faq-item summary{
  cursor:pointer;padding:14px 18px;
  font-weight:600;font-size:.95rem;color:#fff;
  list-style:none;display:flex;justify-content:space-between;align-items:center;
}
details.faq-item summary::after{
  content:"＋";font-size:1.2rem;color:var(--c-primary);
  transition:transform .25s;
}
details.faq-item[open] summary::after{content:"−"}
.faq-body{padding:0 18px 16px;color:var(--c-muted);font-size:.9rem;line-height:1.7}

/* ---- 评论区 ---- */
.comment-grid{display:flex;flex-direction:column;gap:14px;margin-bottom:40px}
.comment-card{
  background:var(--c-bg2);border-radius:var(--radius);
  padding:14px 16px;border-left:3px solid var(--c-border);
  transition:border-color .2s;
}
.comment-card:hover{border-left-color:var(--c-primary)}
.comment-header{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.comment-avatar{
  width:36px;height:36px;border-radius:50%;object-fit:cover;flex-shrink:0;
}
.comment-name{font-size:.88rem;font-weight:600;color:#fff}
.comment-date{font-size:.75rem;color:var(--c-muted);margin-left:auto}
.comment-body{font-size:.88rem;color:var(--c-muted);line-height:1.6}

/* ---- 深度文章 ---- */
.deep-article h3{font-size:1rem;color:var(--c-accent);margin:20px 0 8px}
.deep-article p{font-size:.93rem;color:#ccc;line-height:1.8;margin-bottom:12px}
.deep-article blockquote{
  border-left:3px solid var(--c-primary);margin:16px 0;
  padding:10px 16px;background:rgba(209,0,31,.07);
  font-style:italic;color:#bbb;
}

/* ---- 数字滚动 ---- */
.stats-row{
  display:grid;grid-template-columns:repeat(4,1fr);gap:16px;
  margin-bottom:40px;
}
.stat-box{
  background:var(--c-bg2);border:1px solid var(--c-border);
  border-radius:var(--radius);padding:20px 16px;text-align:center;
}
.stat-box .big{font-size:2rem;font-weight:800;color:var(--c-accent);font-variant-numeric:tabular-nums}
.stat-box .lbl{font-size:.8rem;color:var(--c-muted);margin-top:4px}

/* ---- 进度条 ---- */
.progress-list{display:flex;flex-direction:column;gap:12px;margin-bottom:20px}
.prog-item label{font-size:.85rem;color:var(--c-text);display:flex;justify-content:space-between;margin-bottom:4px}
.prog-track{height:8px;background:var(--c-bg3);border-radius:4px;overflow:hidden}
.prog-fill{height:100%;background:linear-gradient(90deg,var(--c-primary),var(--c-accent));border-radius:4px;transition:width 1s ease}

/* ---- 专家团队 ---- */
.team-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:40px}
.team-card{
  background:var(--c-bg2);border:1px solid var(--c-border);
  border-radius:var(--radius);padding:20px;text-align:center;
}
.team-card img{width:64px;height:64px;border-radius:50%;margin:0 auto 12px;object-fit:cover}
.team-card h3{font-size:.9rem;color:#fff;margin-bottom:4px}
.team-card .role{font-size:.78rem;color:var(--c-primary);margin-bottom:8px}
.team-card p{font-size:.8rem;color:var(--c-muted);line-height:1.5}

/* ---- CTA 区 ---- */
.cta-block{
  background:linear-gradient(135deg,var(--c-primary-dark),#6b0010);
  border-radius:var(--radius);padding:40px;text-align:center;
  margin-bottom:40px;
}
.cta-block h2{color:#fff;font-size:1.6rem;margin-bottom:10px}
.cta-block p{color:rgba(255,255,255,.8);margin-bottom:24px}
.btn-white{
  display:inline-flex;align-items:center;gap:8px;
  background:#fff;color:var(--c-primary);
  border-radius:6px;padding:12px 32px;font-size:1rem;font-weight:700;
  transition:transform .15s,box-shadow .15s;
}
.btn-white:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(0,0,0,.4);text-decoration:none}

/* ---- 页脚 ---- */
footer{
  background:var(--c-bg2);border-top:1px solid var(--c-border);
  padding:40px 20px 20px;margin-top:40px;
}
.footer-inner{max-width:1200px;margin:0 auto}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:32px}
.footer-brand p{font-size:.85rem;color:var(--c-muted);margin-top:10px;max-width:280px;line-height:1.6}
.footer-col h4{font-size:.88rem;color:#fff;margin-bottom:12px;font-weight:700}
.footer-col ul{list-style:none;display:flex;flex-direction:column;gap:7px}
.footer-col ul a{font-size:.83rem;color:var(--c-muted)}
.footer-col ul a:hover{color:var(--c-accent)}

address{font-style:normal;font-size:.82rem;color:var(--c-muted);line-height:1.8;margin-bottom:12px}
.footer-bottom{
  display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px;
  padding-top:16px;border-top:1px solid var(--c-border);
  font-size:.8rem;color:var(--c-muted);
}

/* ---- 滚动渐显 ---- */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .6s ease,transform .6s ease;transition-delay:var(--reveal-delay,0s)}
.reveal.in{opacity:1;transform:none}
.no-js .reveal{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}

/* ---- 面包屑 ---- */
.breadcrumb{font-size:.82rem;color:var(--c-muted);margin-bottom:16px;display:flex;gap:6px;align-items:center}
.breadcrumb a{color:var(--c-muted)}
.breadcrumb a:hover{color:var(--c-accent)}
.breadcrumb span{color:var(--c-border)}

/* ---- 响应式 ---- */
@media(max-width:900px){
  .content-aside{grid-template-columns:1fr}
  .stats-row{grid-template-columns:repeat(2,1fr)}
  .team-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:640px){
  .hero{grid-template-columns:1fr;min-height:auto;padding:24px}
  .hero-image{display:none}
  .hero h1{font-size:1.6rem}
  .nav-links,.nav-search{display:none}
  .nav-toggle{display:block}
  .nav-links.open{
    display:flex;flex-direction:column;
    position:absolute;top:60px;left:0;right:0;
    background:var(--c-bg2);padding:12px 20px;
    border-bottom:1px solid var(--c-border);
  }
  .video-grid{grid-template-columns:repeat(2,1fr)}
  .stats-row{grid-template-columns:repeat(2,1fr)}
  .team-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
}

@media print{
  nav,.site-header,.topbar,footer,.cta-block,.nav-toggle{display:none}
  body{color:#000;background:#fff}
  a[href^="http"]::after{content:" ("attr(href)")";font-size:.8em}
}