/* ============================================================
   课程回播 · 奢华杂志风
   字体: Fraunces (展示衬线) + Instrument Sans (正文) + JetBrains Mono
   ============================================================ */
:root{
  --bg:#080604;
  --bg2:#0e0b08;
  --card:#12100c;
  --card2:#171410;
  --line:rgba(232,196,90,.10);
  --line2:rgba(232,196,90,.20);
  --txt:#f2ece0;
  --sub:#a89d8c;
  --dim:#6d6355;
  --gold:#e0b95c;
  --gold2:#c99a35;
  --gold-glow:rgba(224,185,92,.28);
  --acc:#4fd1a0;
  --red:#e0655f;
  --r:16px;
  --disp:'Fraunces',Georgia,'Songti SC',serif;
  --body:'Instrument Sans','PingFang SC','Microsoft YaHei',sans-serif;
  --mono:'JetBrains Mono',ui-monospace,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg);color:var(--txt);
  font:15px/1.68 var(--body);
  -webkit-font-smoothing:antialiased;
  min-height:100vh;
  overflow-x:hidden;
}
/* 纸质颗粒质感 */
body::before{
  content:'';position:fixed;inset:0;z-index:0;pointer-events:none;opacity:.5;
  background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.055'/%3E%3C/svg%3E");
}
img{display:block;max-width:100%}
[hidden]{display:none !important}
a{color:inherit;text-decoration:none}
button{font:inherit;cursor:pointer;border:0;background:none;color:inherit}
input{font:inherit}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px;position:relative;z-index:1}

/* ============ 顶栏 ============ */
.topbar{
  position:sticky;top:0;z-index:60;
  background:rgba(8,6,4,.78);
  backdrop-filter:blur(18px) saturate(1.4);
  border-bottom:1px solid var(--line);
}
.topbar .wrap{display:flex;align-items:center;gap:24px;height:66px}
.brand{display:flex;align-items:center;gap:10px;white-space:nowrap}
.brand-ico{width:27px;height:27px;color:var(--gold)}
.brand span{
  font-family:var(--disp);font-size:17px;font-weight:600;letter-spacing:.4px;
  background:linear-gradient(135deg,#f0d78f,var(--gold2));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.topnav{display:flex;gap:3px}
.topnav a{
  padding:7px 14px;border-radius:9px;font-size:13.5px;font-weight:600;
  color:var(--sub);transition:.18s;letter-spacing:.2px;
}
.topnav a:hover{color:var(--txt);background:rgba(224,185,92,.06)}
.topnav a.active{color:var(--gold);background:rgba(224,185,92,.09)}
.searchbox{
  margin-left:auto;display:flex;align-items:center;gap:9px;
  background:rgba(224,185,92,.045);border:1px solid var(--line2);
  border-radius:11px;padding:9px 13px;min-width:260px;transition:.2s;
}
.searchbox:focus-within{
  border-color:rgba(224,185,92,.5);
  box-shadow:0 0 0 3px rgba(224,185,92,.07);background:rgba(224,185,92,.07);
}
.searchbox svg{width:16px;height:16px;color:var(--dim);flex:0 0 16px}
.searchbox input{background:none;border:0;outline:none;color:var(--txt);width:100%;font-size:13.5px}
.searchbox input::placeholder{color:var(--dim)}

/* ============ 列表区 ============ */
main{padding:54px 0 80px}
.sec-head{
  display:flex;align-items:baseline;justify-content:space-between;gap:16px;
  flex-wrap:wrap;margin-bottom:26px;
  padding-bottom:16px;border-bottom:1px solid var(--line);
}
.sec-head h2{
  font-family:var(--disp);font-size:23px;font-weight:600;letter-spacing:-.2px;
}
.sec-head h2::before{
  content:'';display:inline-block;width:5px;height:5px;border-radius:50%;
  background:var(--gold);vertical-align:middle;margin-right:11px;
}
.filters{display:flex;gap:8px;flex-wrap:wrap}
.chip{
  padding:7px 17px;border-radius:30px;font-size:12.5px;font-weight:600;
  color:var(--sub);background:rgba(224,185,92,.04);
  border:1px solid var(--line2);transition:.18s;letter-spacing:.2px;
}
.chip:hover{color:var(--txt);border-color:rgba(224,185,92,.42)}
.chip.on{
  color:#1d1400;background:linear-gradient(135deg,#f0d78f,var(--gold2));
  border-color:transparent;font-weight:700;
}
.grid{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:24px;
}

/* ============ 课程卡 ============ */
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  overflow:hidden;cursor:pointer;transition:.24s;
  display:flex;flex-direction:column;position:relative;
}
.card::after{
  content:'';position:absolute;inset:0;border-radius:var(--r);pointer-events:none;
  border:1px solid transparent;transition:.24s;
}
.card:hover{
  transform:translateY(-6px);
  box-shadow:0 30px 60px -26px rgba(0,0,0,.9);
}
.card:hover::after{border-color:rgba(224,185,92,.4)}
.thumb{position:relative;aspect-ratio:16/9;overflow:hidden;background:#0a0806}
.thumb img{width:100%;height:100%;object-fit:cover;transition:.5s;opacity:.92}
.card:hover .thumb img{transform:scale(1.06);opacity:1}
.thumb-layer{position:absolute;inset:0;background:linear-gradient(to top,rgba(6,4,2,.85),transparent 58%)}
.play-btn{
  position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);
  width:54px;height:54px;border-radius:50%;
  background:rgba(8,6,4,.62);border:1.5px solid rgba(224,185,92,.55);
  display:flex;align-items:center;justify-content:center;
  backdrop-filter:blur(8px);transition:.24s;
}
.card:hover .play-btn{
  background:linear-gradient(135deg,#f2d98f,var(--gold2));
  border-color:transparent;transform:translate(-50%,-50%) scale(1.09);
}
.play-btn svg{width:20px;height:20px;color:var(--gold);margin-left:2px;transition:.24s}
.card:hover .play-btn svg{color:#1d1400}
.dur{
  position:absolute;right:10px;bottom:10px;
  font-size:11px;font-weight:700;font-family:var(--mono);
  background:rgba(6,4,2,.86);border-radius:6px;padding:3px 8px;
  color:#e8d7ac;letter-spacing:.4px;border:1px solid var(--line);
}
.cat-tag{
  position:absolute;left:10px;top:10px;
  font-size:10px;font-weight:700;letter-spacing:1.2px;text-transform:uppercase;
  border-radius:5px;padding:3px 9px;
  background:rgba(6,4,2,.8);backdrop-filter:blur(5px);
  color:var(--gold);border:1px solid rgba(224,185,92,.35);
}
.card-body{padding:17px 19px 19px;display:flex;flex-direction:column;gap:10px;flex:1}
.card-title{
  font-family:var(--disp);font-size:16.5px;font-weight:600;line-height:1.42;
  letter-spacing:-.1px;
}
.card-desc{
  font-size:12.5px;color:var(--sub);line-height:1.68;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.card-meta{
  display:flex;align-items:center;gap:10px;margin-top:auto;padding-top:11px;
  border-top:1px solid var(--line);font-size:11.5px;color:var(--dim);
}
.card-meta .who{display:flex;align-items:center;gap:7px;color:var(--sub);font-weight:600}
.avatar{
  width:24px;height:24px;border-radius:50%;flex:0 0 24px;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--disp);font-size:11px;font-weight:700;color:#1d1400;
  background:linear-gradient(135deg,#f0d78f,var(--gold2));
}
.card-meta .date{margin-left:auto;font-family:var(--mono);font-size:10.5px}

/* ============ 空状态 ============ */
.empty{text-align:center;padding:80px 20px;color:var(--dim)}
.empty svg{width:46px;height:46px;opacity:.42;margin:0 auto 16px}
.empty p{font-family:var(--disp);font-size:17px;color:var(--sub);margin-bottom:7px}
.empty span{font-size:12.5px}

/* ============ 播放弹层 ============ */
.player-mask{
  position:fixed;inset:0;z-index:200;
  background:rgba(4,3,2,.93);backdrop-filter:blur(14px);
  display:flex;align-items:center;justify-content:center;padding:18px;
  animation:fadeIn .24s ease;
}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
.player-card{
  position:relative;width:min(96vw,960px);max-height:94vh;overflow:auto;
  background:var(--card);border:1px solid rgba(224,185,92,.24);border-radius:20px;
  box-shadow:0 50px 110px -40px rgba(0,0,0,.98);
  animation:popIn .3s cubic-bezier(.22,1,.36,1);
}
@keyframes popIn{from{opacity:0;transform:translateY(16px) scale(.982)}to{opacity:1;transform:none}}
.player-close{
  position:absolute;right:14px;top:14px;z-index:5;
  width:36px;height:36px;border-radius:10px;
  background:rgba(8,6,4,.7);border:1px solid var(--line2);
  backdrop-filter:blur(8px);
  display:flex;align-items:center;justify-content:center;transition:.18s;
}
.player-close:hover{background:rgba(224,101,95,.2);border-color:rgba(224,101,95,.55)}
.player-close svg{width:17px;height:17px;color:var(--sub)}
.player-close:hover svg{color:var(--red)}

.player-body{background:#000}
.player-body video{width:100%;max-height:58vh;display:block;background:#000}

/* ---- 视频下方：课程信息 ---- */
.player-info{padding:24px 28px 28px}

.pi-top{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;margin-bottom:18px}
.pi-main{min-width:0;flex:1}
.pi-main h3{
  font-family:var(--disp);font-size:20px;font-weight:600;
  line-height:1.4;letter-spacing:-.3px;margin-bottom:10px;
}
.pi-meta{display:flex;align-items:center;gap:9px;flex-wrap:wrap;font-size:12.5px;color:var(--sub)}
.pi-meta .dot{opacity:.35}
.pi-meta .who{display:flex;align-items:center;gap:7px;font-weight:600;color:var(--txt)}
.pi-avatar{
  width:24px;height:24px;border-radius:50%;flex:0 0 24px;
  display:flex;align-items:center;justify-content:center;
  font-family:var(--disp);font-size:11px;font-weight:700;color:#1d1400;
  background:linear-gradient(135deg,#f0d78f,var(--gold2));
}
.pi-cat{
  flex:0 0 auto;font-size:10.5px;font-weight:700;letter-spacing:1.4px;text-transform:uppercase;
  padding:5px 13px;border-radius:20px;
  color:var(--gold);background:rgba(224,185,92,.1);
  border:1px solid rgba(224,185,92,.34);
}

.pi-stats{
  display:flex;gap:30px;flex-wrap:wrap;
  padding:15px 19px;margin-bottom:20px;
  background:rgba(224,185,92,.035);border:1px solid var(--line);border-radius:12px;
}
.pi-stats>div{display:flex;flex-direction:column;gap:3px}
.pi-stats b{font-family:var(--mono);font-size:14px;font-weight:700;color:var(--gold)}
.pi-stats span{font-size:10.5px;color:var(--dim);letter-spacing:.4px}

.pi-label{
  display:block;font-size:11px;font-weight:700;color:var(--sub);
  letter-spacing:1.6px;text-transform:uppercase;margin-bottom:11px;
}
.pi-label::after{
  content:'';display:block;width:22px;height:1px;
  background:linear-gradient(90deg,var(--gold),transparent);margin-top:7px;
}
.pi-desc{font-size:13.5px;color:var(--sub);line-height:1.82}
.pi-desc-wrap{margin-bottom:22px}

.chapters{list-style:none;display:flex;flex-direction:column;gap:3px}
.chapters li{
  display:flex;align-items:center;gap:12px;
  padding:11px 13px;border-radius:10px;font-size:13.5px;
  color:var(--sub);transition:.16s;border:1px solid transparent;
}
.chapters li:hover{
  background:rgba(224,185,92,.05);color:var(--txt);
  border-color:var(--line2);
}
.chapters .idx{
  font-family:var(--mono);font-size:11px;font-weight:700;
  color:var(--gold);flex:0 0 28px;
}
.chapters .ct{flex:1}
.chapters .ctime{font-family:var(--mono);font-size:11px;color:var(--dim)}

/* ============ 页脚 ============ */
.foot{
  border-top:1px solid var(--line);padding:28px 0;
  background:rgba(224,185,92,.015);
}
.foot .wrap{display:flex;align-items:center;gap:10px;flex-wrap:wrap;font-size:12.5px;color:var(--dim)}
.foot-brand{font-family:var(--disp);font-size:14px;color:var(--gold);letter-spacing:.3px}
.foot .dot{opacity:.4}

/* ============================================================
   响应式适配（按断点从小到大排列，后者覆盖前者）
   xs<380 | sm 380-639 | md 640-899 | lg 900-1199 | xl>=1200 | xxl>=1600
   ============================================================ */
@media (max-width:379px){
  .wrap{padding:0 12px}
  .topbar .wrap{padding:10px 12px;gap:9px}
  .brand span{font-size:15px}
  .brand-ico{width:24px;height:24px}
.sec-head h2{font-size:17px}
  .chip{padding:5px 12px;font-size:11.5px}
  .card-title{font-size:15px}
  .pi-main h3{font-size:15.5px}
  .pi-stats b{font-size:12px}
  .chapters li{font-size:12.5px;padding:9px 10px}
}
@media (max-width:639px){
  .wrap{padding:0 15px}

  /* 顶栏换行 */
  .topbar .wrap{
    height:auto;flex-wrap:wrap;gap:11px;
    padding:12px 15px;
  }
  .brand span{font-size:16px}
  .searchbox{
    order:3;width:100%;flex:1 0 100%;
    padding:8px 12px;
  }

  /* 主推区紧凑 */
  
  
  
  /* 按钮全宽堆叠 */
/* 列表区 */
  main{padding:30px 0 54px}
  .sec-head{margin-bottom:18px;padding-bottom:13px;gap:12px}
  .sec-head h2{font-size:18px}
  .sec-head h2::before{width:4px;height:4px;margin-right:9px}
  .filters{gap:6px}
  .chip{padding:6px 14px;font-size:12px}
  .grid{grid-template-columns:1fr;gap:15px}

  /* 卡片 */
  .card-body{padding:15px 16px 16px}
  .card-title{font-size:15.5px}
  .card-desc{font-size:12.5px}
  .play-btn{width:48px;height:48px}
  .play-btn svg{width:18px;height:18px}

  /* 播放器 */
  .player-mask{padding:8px}
  .player-card{max-height:97vh;border-radius:14px}
  .player-body video{max-height:42vh}
  .player-close{width:32px;height:32px;right:10px;top:10px}
  .player-close svg{width:15px;height:15px}
  .player-info{padding:16px 16px 20px}
  .pi-top{flex-direction:column;gap:9px;margin-bottom:14px}
  .pi-main h3{font-size:16.5px;line-height:1.36}
  .pi-cat{align-self:flex-start;font-size:10px;padding:4px 11px}
  .pi-stats{
    gap:0;justify-content:space-between;padding:12px 14px;margin-bottom:16px;
  }
  .pi-stats>div{flex:1;align-items:center;text-align:center}
  .pi-stats b{font-size:13px}
  .pi-stats span{font-size:10px}
  .pi-desc{font-size:13px;line-height:1.76}
  .pi-desc-wrap{margin-bottom:18px}
  .pi-label{font-size:10.5px;letter-spacing:1.4px;margin-bottom:9px}
  .chapters li{padding:10px 11px;font-size:13px;gap:10px}
  .chapters .idx{flex:0 0 24px;font-size:10.5px}
  .chapters .ctime{font-size:10.5px}

  /* 页脚 */
  .foot{padding:22px 0}
  .foot .wrap{font-size:12px;gap:8px}
}
@media (max-width:899px){
  /* 主推区改单列，封面在上 */
  /* 顶栏：隐藏导航，搜索占满 */
  .topnav{display:none}
  .searchbox{min-width:0;flex:1;margin-left:auto}

  /* 列表 2 列 */
  .grid{grid-template-columns:repeat(2,1fr);gap:18px}

  /* 播放器信息区 */
  .pi-main h3{font-size:18px}
  .player-card{width:min(98vw,820px)}
}
@media (max-width:1199px){
  .wrap{max-width:100%;padding:0 22px}
  .grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:22px}
}
@media (min-width:1200px){
  .wrap{max-width:1240px}
  .grid{grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:26px}
}
@media (min-width:1600px){
  .wrap{max-width:1360px}
  }
@media (max-height:500px) and (orientation:landscape){
  .player-body video{max-height:64vh}
}
@media (hover:none){
  /* 触摸屏：去掉 hover 效果，避免点击残留 */
  .card:hover{transform:none}
  .card:hover .thumb img{transform:none}
  .card:hover::after{border-color:transparent}
  .card:hover .play-btn{background:rgba(8,6,4,.62);border-color:rgba(224,185,92,.55)}
  .card:hover .play-btn svg{color:var(--gold)}
  
  

  /* 触摸目标至少 44px */
  .chip{min-height:36px;display:inline-flex;align-items:center}
  .chapters li{padding:12px}
}
@media print{
  .topbar,.filters,.searchbox,.player-mask{display:none}
  body{background:#fff;color:#000}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
}