:root {
    --bg: #08080a;
    --bg-soft: #0e0e12;
    --panel: #131318;
    --panel-2: #17171d;
    --line: rgba(255, 255, 255, .1);
    --line-soft: rgba(255, 255, 255, .06);
    --text: #f4f4f6;
    --text-2: #a3a6ae;
    --text-3: #74777f;
    --accent: #ec4f30;
    --accent-soft: rgba(236, 79, 48, .12);
    --radius: 14px;
    --serif: "Songti SC", "Source Han Serif SC", "Noto Serif SC", Georgia, "Times New Roman", serif;
    --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
    --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  }

  * { box-sizing: border-box; }

  html { scroll-behavior: smooth; }

  body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--sans);
    font-size: 15px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
  }

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

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

  .wrap { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }

  /* ── 导航 ───────────────────────────────── */
  .nav {
    position: fixed; inset: 16px 0 auto; z-index: 50;
    pointer-events: none;
  }
  .nav-inner {
    pointer-events: auto;
    display: flex; align-items: center; justify-content: space-between; gap: 24px;
    padding: 10px 12px 10px 18px;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: rgba(12, 12, 14, .72);
    backdrop-filter: blur(14px);
  }
  .brand { display: flex; align-items: center; gap: 10px; font-weight: 600; letter-spacing: .01em; }
  .brand img { width: 26px; height: 26px; border-radius: 8px; }
  .nav-links { display: flex; gap: 26px; font-size: 13px; color: var(--text-2); }
  .nav-links a:hover { color: var(--text); }
  .btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    padding: 11px 20px; border-radius: 999px;
    font-size: 13.5px; font-weight: 600; letter-spacing: .01em;
    border: 1px solid transparent; cursor: pointer;
    transition: transform .18s ease, background .18s ease, border-color .18s ease;
  }
  .btn:hover { transform: translateY(-1px); }
  .btn-primary { background: var(--accent); color: #fff; }
  .btn-primary:hover { background: #f5684b; }
  .btn-ghost { border-color: var(--line); color: var(--text); background: transparent; }
  .btn-ghost:hover { border-color: rgba(255,255,255,.28); background: rgba(255,255,255,.04); }
  .nav .btn { padding: 9px 18px; }

  /* ── Hero ──────────────────────────────── */
  .hero { position: relative; padding: 168px 0 88px; overflow: hidden; }
  .hero::before {
    content: ""; position: absolute; left: 50%; top: -320px; width: 1100px; height: 700px;
    transform: translateX(-50%);
    background: radial-gradient(50% 50% at 50% 50%, rgba(236, 79, 48, .22), transparent 70%);
    pointer-events: none;
  }
  .hero::after {
    content: ""; position: absolute; inset: 0;
    background-image: radial-gradient(rgba(255,255,255,.055) 1px, transparent 1px);
    background-size: 26px 26px;
    mask-image: radial-gradient(60% 50% at 50% 20%, #000 20%, transparent 80%);
    pointer-events: none;
  }
  .hero .wrap { position: relative; z-index: 2; }
  .eyebrow {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 6px 12px; border: 1px solid var(--line); border-radius: 999px;
    font-size: 12px; color: var(--text-2); letter-spacing: .04em;
  }
  .eyebrow i { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }
  h1 {
    margin: 26px 0 0;
    font-family: var(--serif);
    font-size: clamp(44px, 7vw, 86px);
    line-height: 1.04;
    letter-spacing: -.01em;
    font-weight: 600;
  }
  h1 em { font-style: normal; color: var(--accent); }
  .hero p.lead {
    margin: 22px 0 0; max-width: 620px;
    font-size: clamp(15px, 1.4vw, 17px);
    color: var(--text-2);
  }
  .hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
  .hero-meta { display: flex; flex-wrap: wrap; gap: 22px; margin-top: 26px; font-size: 12.5px; color: var(--text-3); }
  .hero-meta span { display: inline-flex; align-items: center; gap: 7px; }
  .hero-meta b { color: var(--text-2); font-weight: 500; }

  .shot-frame {
    position: relative; margin-top: 62px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.01));
    padding: 10px;
    box-shadow: 0 40px 120px -60px rgba(236, 79, 48, .55);
  }
  .shot-frame img { border-radius: 12px; border: 1px solid var(--line-soft); }
  .shot-cap {
    display: flex; justify-content: space-between; gap: 12px;
    padding: 12px 8px 2px; font-size: 12px; color: var(--text-3);
  }

  /* ── 数字条 ─────────────────────────────── */
  .stats { border-block: 1px solid var(--line-soft); background: var(--bg-soft); }
  .stats-inner { display: grid; grid-template-columns: repeat(4, 1fr); }
  .stat { padding: 26px 8px; border-left: 1px solid var(--line-soft); }
  .stat:first-child { border-left: 0; }
  .stat b { display: block; font-family: var(--serif); font-size: 26px; font-weight: 600; }
  .stat span { font-size: 12.5px; color: var(--text-3); }

  /* ── 通用 section ───────────────────────── */
  section.block { padding: 96px 0; position: relative; }
  .sec-head { display: grid; gap: 14px; max-width: 720px; }
  .sec-label {
    font-family: var(--mono); font-size: 12px; letter-spacing: .16em;
    color: var(--accent); text-transform: uppercase;
  }
  .sec-head h2 {
    margin: 0; font-family: var(--serif); font-weight: 600;
    font-size: clamp(28px, 4vw, 44px); line-height: 1.16; letter-spacing: -.01em;
  }
  .sec-head p { margin: 0; color: var(--text-2); max-width: 640px; }

  /* ── 功能矩阵 ───────────────────────────── */
  .matrix { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 44px; }
  .card {
    position: relative; padding: 24px;
    border: 1px solid var(--line); border-radius: var(--radius);
    background: linear-gradient(180deg, var(--panel-2), var(--panel));
    transition: border-color .2s ease, transform .2s ease;
  }
  .card:hover { border-color: rgba(255,255,255,.24); transform: translateY(-2px); }
  .card-no { font-family: var(--mono); font-size: 11.5px; color: var(--text-3); letter-spacing: .12em; }
  .card h3 { margin: 12px 0 6px; font-size: 17px; font-weight: 600; }
  .card .sub { font-size: 12.5px; color: var(--accent); letter-spacing: .02em; }
  .card p { margin: 12px 0 0; color: var(--text-2); font-size: 13.5px; }
  .card ul { margin: 14px 0 0; padding: 0; list-style: none; display: grid; gap: 7px; }
  .card li { font-size: 12.5px; color: var(--text-3); padding-left: 14px; position: relative; }
  .card li::before { content: ""; position: absolute; left: 0; top: 8px; width: 5px; height: 5px; border-radius: 50%; background: var(--text-3); }

  /* ── 详情行 ─────────────────────────────── */
  .row { display: grid; gap: 26px; padding: 52px 0; border-top: 1px solid var(--line-soft); }
  .row:first-of-type { border-top: 0; padding-top: 6px; }
  .row-copy { max-width: 780px; }
  .row-copy .kicker { font-family: var(--mono); font-size: 11.5px; letter-spacing: .12em; color: var(--text-3); }
  .row-copy h3 { margin: 12px 0 10px; font-family: var(--serif); font-size: clamp(22px, 2.4vw, 30px); font-weight: 600; }
  .row-copy p { margin: 0; color: var(--text-2); }
  .row-copy ul { margin: 18px 0 0; padding: 0; list-style: none; display: grid; gap: 9px; }
  .row-copy li { font-size: 13.5px; color: var(--text-2); padding-left: 18px; position: relative; }
  .row-copy li::before { content: "→"; position: absolute; left: 0; color: var(--accent); font-size: 12px; }
  .row-media {
    border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
    background: var(--panel); padding: 8px;
  }
  .row-media img { border-radius: 9px; border: 1px solid var(--line-soft); }

  /* ── 流程 ───────────────────────────────── */
  .steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 44px; counter-reset: s; }
  .step { padding: 22px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
  .step::before {
    counter-increment: s; content: "0" counter(s);
    font-family: var(--mono); font-size: 12px; color: var(--accent); letter-spacing: .1em;
  }
  .step h4 { margin: 10px 0 6px; font-size: 15px; }
  .step p { margin: 0; font-size: 12.5px; color: var(--text-3); }

  /* ── 下载 ───────────────────────────────── */
  .download {
    display: grid; grid-template-columns: 1.2fr .8fr; gap: 40px; align-items: center;
    padding: 44px; border: 1px solid rgba(236,79,48,.35); border-radius: 20px;
    background:
      radial-gradient(120% 140% at 0% 0%, rgba(236,79,48,.16), transparent 60%),
      linear-gradient(180deg, var(--panel-2), var(--panel));
  }
  .download h2 { margin: 12px 0 0; font-family: var(--serif); font-size: clamp(26px, 3vw, 38px); font-weight: 600; }
  .download p { margin: 14px 0 0; color: var(--text-2); }
  .dl-spec { display: grid; gap: 10px; margin: 22px 0 0; }
  .dl-spec div { display: flex; justify-content: space-between; gap: 16px; font-size: 13px; padding-bottom: 10px; border-bottom: 1px dashed var(--line); }
  .dl-spec span { color: var(--text-3); }
  .dl-spec b { font-weight: 500; font-family: var(--mono); font-size: 12.5px; }
  .dl-actions { display: grid; gap: 12px; }
  .dl-actions .btn { width: 100%; padding: 15px 20px; font-size: 14px; }
  .dl-note { font-size: 11.5px; color: var(--text-3); line-height: 1.7; }

  /* ── 关注 ───────────────────────────────── */
  .qr-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 14px; margin-top: 40px; }
  .qr { padding: 12px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
  .qr .qr-box { aspect-ratio: 1; display: flex; align-items: center; justify-content: center; border-radius: 10px; overflow: hidden; }
  .qr img { width: 100%; height: 100%; object-fit: contain; }
  .qr b { display: block; margin-top: 10px; font-size: 13px; }
  .qr span { font-size: 11.5px; color: var(--text-3); }
  .links { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-top: 26px; }
  .link {
    display: flex; align-items: center; justify-content: space-between; gap: 10px;
    padding: 15px 17px; border: 1px solid var(--line); border-radius: 12px;
    background: var(--panel); transition: border-color .18s ease, background .18s ease;
  }
  .link:hover { border-color: rgba(255,255,255,.26); background: var(--panel-2); }
  .link b { font-size: 13.5px; font-weight: 600; }
  .link em { font-style: normal; display: block; font-size: 11.5px; color: var(--text-3); }
  .link i { color: var(--text-3); font-style: normal; }

  /* ── 页脚 ───────────────────────────────── */
  footer { padding: 60px 0 40px; border-top: 1px solid var(--line-soft); color: var(--text-3); font-size: 12.5px; }
  .foot-top { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 24px; align-items: flex-start; }
  .foot-brand { display: flex; gap: 12px; align-items: center; color: var(--text-2); }
  .foot-brand img { width: 34px; height: 34px; border-radius: 10px; }
  .foot-links { display: flex; gap: 22px; }
  .foot-links a:hover { color: var(--text); }
  .disclaimer { margin-top: 28px; padding-top: 22px; border-top: 1px solid var(--line-soft); line-height: 1.8; max-width: 900px; }

  /* ── 响应式 ─────────────────────────────── */
  @media (max-width: 980px) {
    .matrix { grid-template-columns: repeat(2, 1fr); }
    .steps { grid-template-columns: repeat(2, 1fr); }
    .qr-grid { grid-template-columns: repeat(3, 1fr); }
    .links { grid-template-columns: repeat(2, 1fr); }
    .download { grid-template-columns: 1fr; padding: 30px; }
    .stats-inner { grid-template-columns: repeat(2, 1fr); }
    .stat:nth-child(3) { border-left: 0; }
  }
  @media (max-width: 640px) {
    .nav-links { display: none; }
    .hero { padding: 140px 0 64px; }
    h1 { font-size: 38px; }
    .matrix, .steps { grid-template-columns: 1fr; }
    .qr-grid { grid-template-columns: repeat(2, 1fr); }
    .links { grid-template-columns: 1fr; }
  }