:root{
    --bg:#0b0d14;
    --bg-2:#11131d;
    --card:#171a26;
    --card-2:#1d2130;
    --line:#272c3d;
    --txt:#eef0f6;
    --muted:#9aa1b8;
    --accent:#4de1c1;
    --accent-2:#ff5c8a;
    --radius:16px;
  }
  *{box-sizing:border-box;margin:0;padding:0;}
  html{scroll-behavior:smooth;}
  body{
    background:var(--bg);
    color:var(--txt);
    font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
    line-height:1.65;
    -webkit-font-smoothing:antialiased;
    overflow-x:hidden;
  }
  img{display:block;max-width:100%;}
  a{color:inherit;text-decoration:none;}
  .wrap{width:100%;max-width:1180px;margin:0 auto;padding:0 20px;}

  /* ---------- 顶部 ---------- */
  .site-head{
    position:sticky;top:0;z-index:50;
    background:rgba(11,13,20,.88);
    backdrop-filter:blur(14px);
    border-bottom:1px solid var(--line);
  }
  .head-inner{
    display:flex;align-items:center;gap:16px;
    height:64px;
  }
  .brand{display:flex;align-items:center;gap:10px;flex-shrink:0;}
  .brand img{height:34px;width:auto;border-radius:8px;}
  .brand-name{font-size:17px;font-weight:700;letter-spacing:.5px;}
  .nav{
    margin-left:auto;
    display:flex;gap:4px;
    overflow-x:auto;
    scrollbar-width:none;
  }
  .nav::-webkit-scrollbar{display:none;}
  .nav a{
    font-size:14px;color:var(--muted);
    padding:8px 12px;border-radius:999px;
    white-space:nowrap;transition:color .2s,background .2s;
  }
  .nav a:hover{color:var(--txt);background:var(--card);}
  .head-dl{
    flex-shrink:0;
    font-size:14px;font-weight:600;
    padding:9px 18px;border-radius:999px;
    background:linear-gradient(120deg,var(--accent),#3fc9e8);
    color:#06251f;
    transition:transform .2s,box-shadow .2s;
  }
  .head-dl:hover{transform:translateY(-1px);box-shadow:0 6px 20px rgba(77,225,193,.3);}

  /* ---------- 首屏轮播 ---------- */
  .hero{
    position:relative;overflow:hidden;
    background:radial-gradient(1200px 500px at 20% -10%,#1d2a3a 0%,transparent 60%),
               radial-gradient(900px 460px at 90% 0%,#2a1630 0%,transparent 55%),
               var(--bg);
    padding:34px 0 46px;
  }
  .hero-track{
    display:flex;
    transition:transform .55s cubic-bezier(.5,.05,.2,1);
  }
  .hero-slide{
    flex:0 0 100%;
    display:grid;
    grid-template-columns:1fr;
    gap:24px;
  }
  .hero-media{
    border-radius:22px;overflow:hidden;
    border:1px solid var(--line);
    box-shadow:0 24px 60px rgba(0,0,0,.55);
    max-height:520px;
  }
  .hero-media img{width:100%;height:100%;object-fit:cover;object-position:center top;}
  .hero-copy{
    display:flex;flex-direction:column;justify-content:center;gap:16px;
  }
  .tag-row{display:flex;flex-wrap:wrap;gap:8px;}
  .tag{
    font-size:12px;color:var(--accent);
    border:1px solid rgba(77,225,193,.4);
    padding:4px 10px;border-radius:999px;
    background:rgba(77,225,193,.07);
  }
  .tag.pink{color:var(--accent-2);border-color:rgba(255,92,138,.4);background:rgba(255,92,138,.08);}
  h1{
    font-size:clamp(26px,4.4vw,42px);
    line-height:1.28;letter-spacing:-.5px;
    font-weight:800;
  }
  h1 em{font-style:normal;color:var(--accent);}
  .hero-sub{color:var(--muted);font-size:15px;max-width:38em;}
  .hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:4px;}
  .btn{
    display:inline-flex;align-items:center;justify-content:center;
    padding:12px 26px;border-radius:999px;
    font-size:15px;font-weight:600;
  }
  .btn-main{
    background:linear-gradient(120deg,var(--accent),#3fc9e8);
    color:#06251f;
    box-shadow:0 10px 28px rgba(77,225,193,.25);
  }
  .btn-ghost{
    border:1px solid var(--line);color:var(--txt);
    background:var(--card);
  }
  .hero-ctrl{
    display:flex;align-items:center;gap:14px;
    margin-top:22px;
  }
  .dots{display:flex;gap:8px;}
  .dots button{
    width:26px;height:5px;border:none;border-radius:99px;
    background:var(--line);cursor:pointer;padding:0;
    transition:background .2s,width .2s;
  }
  .dots button.on{background:var(--accent);width:40px;}
  .arrow-btn{
    width:36px;height:36px;border-radius:50%;
    border:1px solid var(--line);background:var(--card);
    color:var(--txt);cursor:pointer;font-size:16px;line-height:1;
  }
  .arrow-btn:hover{border-color:var(--accent);color:var(--accent);}

  /* ---------- 通用区块 ---------- */
  section{padding:56px 0;}
  .sec-head{
    display:flex;align-items:flex-end;justify-content:space-between;
    gap:16px;margin-bottom:26px;flex-wrap:wrap;
  }
  h2{
    font-size:clamp(21px,3vw,28px);
    font-weight:800;letter-spacing:-.3px;
  }
  h2 span{color:var(--accent);}
  .sec-desc{color:var(--muted);font-size:14px;max-width:34em;}
  h3{font-size:17px;font-weight:700;margin-bottom:6px;}

  /* ---------- 网格卡片 ---------- */
  .grid{
    display:grid;
    grid-template-columns:repeat(2,1fr);
    gap:16px;
  }
  .card{
    background:var(--card);
    border:1px solid var(--line);
    border-radius:var(--radius);
    overflow:hidden;
    transition:transform .25s,border-color .25s,box-shadow .25s;
  }
  .card:hover{
    transform:translateY(-4px);
    border-color:rgba(77,225,193,.45);
    box-shadow:0 18px 40px rgba(0,0,0,.5);
  }
  .card .thumb{
    aspect-ratio:3/4;
    overflow:hidden;
    background:var(--card-2);
  }
  .card .thumb img{width:100%;height:100%;object-fit:cover;object-position:center top;transition:transform .5s;}
  .card:hover .thumb img{transform:scale(1.05);}
  .card-body{padding:12px 13px 14px;}
  .card-body p{font-size:13px;color:var(--muted);line-height:1.55;}
  .meta{
    display:flex;gap:8px;flex-wrap:wrap;
    margin-top:10px;font-size:11px;color:var(--muted);
  }
  .meta i{font-style:normal;background:var(--card-2);padding:2px 8px;border-radius:99px;}

  /* ---------- 横向滑动 ---------- */
  .hscroll{
    display:flex;gap:14px;overflow-x:auto;
    padding-bottom:14px;scroll-snap-type:x mandatory;
    scrollbar-width:thin;scrollbar-color:var(--line) transparent;
  }
  .hscroll > .card{
    flex:0 0 62%;
    max-width:260px;
    scroll-snap-align:start;
  }
  .hscroll::-webkit-scrollbar{height:6px;}
  .hscroll::-webkit-scrollbar-thumb{background:var(--line);border-radius:99px;}

  /* ---------- AI 专区 ---------- */
  .ai-block{
    background:linear-gradient(140deg,#141a2a,#101420 55%,#181223);
    border:1px solid var(--line);
    border-radius:24px;
    padding:30px 22px;
  }
  .ai-inner{display:grid;grid-template-columns:1fr;gap:26px;align-items:center;}
  .ai-shot{
    border-radius:18px;overflow:hidden;
    border:1px solid var(--line);
    box-shadow:0 20px 44px rgba(0,0,0,.55);
  }
  .ai-shot img{width:100%;height:100%;object-fit:cover;object-position:center top;}
  .ai-list{list-style:none;display:grid;gap:14px;margin-top:18px;}
  .ai-list li{
    display:flex;gap:12px;align-items:flex-start;
    font-size:14px;color:var(--muted);
  }
  .ai-list b{
    color:var(--txt);font-weight:600;display:block;font-size:15px;
    margin-bottom:2px;
  }
  .dotmark{
    flex-shrink:0;width:22px;height:22px;border-radius:50%;
    background:rgba(77,225,193,.14);color:var(--accent);
    font-size:12px;display:flex;align-items:center;justify-content:center;
    margin-top:3px;
  }

  /* ---------- 分类速览 ---------- */
  .cat-grid{
    display:grid;grid-template-columns:repeat(2,1fr);gap:14px;
  }
  .cat{
    background:var(--card);border:1px solid var(--line);
    border-radius:14px;padding:16px;
    transition:background .25s,border-color .25s;
  }
  .cat:hover{background:var(--card-2);border-color:rgba(255,92,138,.4);}
  .cat h3{font-size:15px;}
  .cat p{font-size:13px;color:var(--muted);}

  /* ---------- 观看方式 ---------- */
  .steps{
    display:grid;grid-template-columns:1fr;gap:14px;
  }
  .step{
    display:flex;gap:16px;
    background:var(--card);border:1px solid var(--line);
    border-radius:var(--radius);padding:18px;
  }
  .step-num{
    flex-shrink:0;width:34px;height:34px;border-radius:10px;
    display:flex;align-items:center;justify-content:center;
    font-weight:800;font-size:15px;
    background:rgba(77,225,193,.12);color:var(--accent);
  }
  .step p{font-size:14px;color:var(--muted);}

  /* ---------- 截图墙 ---------- */
  .wall{
    display:grid;
    grid-template-columns:repeat(2,1fr);
    gap:12px;
  }
  .wall figure{
    border-radius:14px;overflow:hidden;
    border:1px solid var(--line);
    background:var(--card-2);
    aspect-ratio:3/4;
  }
  .wall img{width:100%;height:100%;object-fit:cover;object-position:center top;}
  .wall figcaption{
    position:absolute;/* 仅作语义占位，不显示 */
    display:none;
  }

  /* ---------- 下载区 ---------- */
  .cta{
    position:relative;
    background:radial-gradient(800px 300px at 15% 0%,rgba(77,225,193,.14),transparent 60%),
               radial-gradient(700px 300px at 90% 100%,rgba(255,92,138,.14),transparent 60%),
               var(--bg-2);
    border-top:1px solid var(--line);
    border-bottom:1px solid var(--line);
    text-align:center;
    padding:64px 0;
  }
  .cta h2{margin-bottom:12px;}
  .cta p{color:var(--muted);font-size:15px;max-width:36em;margin:0 auto 26px;}
  .cta .btn-main{padding:14px 40px;font-size:16px;}

  /* ---------- 页脚 ---------- */
  .site-foot{
    padding:36px 0 44px;
    border-top:1px solid var(--line);
  }
  .foot-top{
    display:flex;flex-wrap:wrap;gap:18px;align-items:center;
    justify-content:space-between;margin-bottom:18px;
  }
  .foot-brand{display:flex;align-items:center;gap:10px;}
  .foot-brand img{height:28px;border-radius:7px;}
  .foot-brand span{font-size:15px;font-weight:700;}
  .foot-links{display:flex;flex-wrap:wrap;gap:16px;font-size:13px;color:var(--muted);}
  .foot-links a:hover{color:var(--accent);}
  .foot-bottom{
    font-size:12px;color:#6b7288;
    display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;
    border-top:1px dashed var(--line);padding-top:16px;
  }
  .foot-bottom time{color:#7c8399;}

  /* ---------- 断点：768px ---------- */
  @media (min-width:768px){
    .wrap{padding:0 32px;}
    .hero-slide{grid-template-columns:1.05fr .95fr;align-items:center;gap:34px;}
    .hero-media{max-height:none;height:420px;}
    .grid{grid-template-columns:repeat(3,1fr);gap:18px;}
    .cat-grid{grid-template-columns:repeat(3,1fr);}
    .steps{grid-template-columns:repeat(3,1fr);}
    .wall{grid-template-columns:repeat(4,1fr);}
    .hscroll > .card{flex:0 0 30%;}
    .ai-inner{grid-template-columns:.9fr 1.1fr;gap:34px;}
    .ai-shot{height:420px;}
    .head-inner{height:70px;}
    section{padding:70px 0;}
  }

  /* ---------- 断点：1024px ---------- */
  @media (min-width:1024px){
    .hero{padding:44px 0 60px;}
    .hero-media{height:500px;}
    .grid{grid-template-columns:repeat(4,1fr);}
    .hscroll > .card{flex:0 0 22%;}
    .wall{grid-template-columns:repeat(5,1fr);}
    .cat-grid{grid-template-columns:repeat(4,1fr);}
    .ai-block{padding:44px;}
    .hero-sub{font-size:16px;}
  }