/* ============ 基础 ============ */
    :root {
      --blue-50: #eff6ff;
      --blue-100: #dbeafe;
      --blue-200: #bfdbfe;
      --blue-500: #3b82f6;
      --blue-600: #2563eb;
      --blue-700: #1d4ed8;
      --cyan: #06b6d4;
      --ink: #0b1220;
      --title: #0f172a;
      --text: #334155;
      --muted: #64748b;
      --line: #e5eaf2;
      --bg: #f7f9fc;
      --white: #ffffff;
      --container: 1180px;
      --radius: 18px;
      --shadow-sm: 0 4px 14px rgba(15, 23, 42, 0.05);
      --shadow: 0 12px 32px rgba(15, 23, 42, 0.07);
      --shadow-lg: 0 28px 70px rgba(15, 23, 42, 0.14);
      --ease: cubic-bezier(0.22, 1, 0.36, 1);
    }

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

    html {
      scroll-behavior: smooth;
      -webkit-text-size-adjust: 100%;
    }

    body {
      margin: 0;
      font-family: "Inter", "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
      color: var(--text);
      background: var(--white);
      line-height: 1.7;
      font-size: 16px;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    img, svg { display: block; max-width: 100%; }
    a { color: inherit; text-decoration: none; }
    button { font: inherit; color: inherit; }
    h1, h2, h3, h4 { margin: 0; color: var(--title); line-height: 1.28; font-weight: 700; letter-spacing: -0.015em; }
    p { margin: 0; }
    ul { margin: 0; padding: 0; list-style: none; }

    ::selection { background: var(--blue-200); color: var(--blue-700); }

    .container {
      width: 100%;
      max-width: var(--container);
      margin: 0 auto;
      padding: 0 24px;
    }

    .icon { width: 22px; height: 22px; stroke: currentColor; fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
    .icon-sm { width: 18px; height: 18px; }
    .icon-lg { width: 26px; height: 26px; }

    .section { padding: 96px 0; position: relative; }
    .section-tight { padding: 76px 0; }
    .section-alt { background: var(--bg); }

    .section-head { max-width: 720px; margin: 0 auto 52px; text-align: center; }
    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 7px;
      padding: 6px 14px;
      border-radius: 999px;
      background: var(--blue-50);
      border: 1px solid var(--blue-100);
      color: var(--blue-700);
      font-size: 13px;
      font-weight: 600;
      letter-spacing: 0.02em;
      margin-bottom: 18px;
    }
    .eyebrow::before {
      content: "";
      width: 6px; height: 6px;
      border-radius: 50%;
      background: var(--blue-600);
      box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.14);
    }
    .section-head h2 { font-size: clamp(26px, 3.4vw, 38px); }
    .section-head p { margin-top: 14px; color: var(--muted); font-size: 16.5px; }

    .grad-text {
      background: linear-gradient(100deg, var(--blue-600), var(--cyan));
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
    }

    /* ============ 按钮 ============ */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 13px 26px;
      border-radius: 12px;
      border: 1px solid transparent;
      font-size: 15px;
      font-weight: 600;
      cursor: pointer;
      transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), background 0.25s, color 0.25s, border-color 0.25s;
      white-space: nowrap;
    }
    .btn .icon { width: 18px; height: 18px; transition: transform 0.25s var(--ease); }
    .btn:hover .icon { transform: translateX(3px); }

    .btn-primary {
      color: #fff;
      background: linear-gradient(135deg, var(--blue-600), #1e60e0 55%, var(--cyan));
      box-shadow: 0 10px 24px rgba(37, 99, 235, 0.28);
    }
    .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 34px rgba(37, 99, 235, 0.34); }

    .btn-ghost {
      color: var(--blue-700);
      background: #fff;
      border-color: var(--blue-100);
      box-shadow: var(--shadow-sm);
    }
    .btn-ghost:hover { border-color: var(--blue-500); color: var(--blue-700); transform: translateY(-2px); }

    .btn-sm { padding: 10px 20px; font-size: 14px; border-radius: 10px; }
    .btn-block { width: 100%; }

    /* ============ 顶部导航 ============ */
    .site-header {
      position: fixed;
      inset: 0 0 auto 0;
      z-index: 100;
      transition: background 0.3s, box-shadow 0.3s, border-color 0.3s;
      border-bottom: 1px solid transparent;
    }
    .site-header.scrolled {
      background: rgba(255, 255, 255, 0.9);
      backdrop-filter: saturate(180%) blur(14px);
      -webkit-backdrop-filter: saturate(180%) blur(14px);
      border-bottom-color: var(--line);
      box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
    }
    .nav-inner {
      height: 72px;
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
    .brand-mark {
      width: 38px; height: 38px;
      border-radius: 11px;
      background: linear-gradient(140deg, var(--blue-600), #1e60e0 45%, var(--cyan));
      box-shadow: 0 8px 18px rgba(37, 99, 235, 0.3);
      display: grid;
      place-items: center;
      color: #fff;
      flex-shrink: 0;
    }
    .brand-mark svg { width: 20px; height: 20px; }
    .brand-text { display: flex; flex-direction: column; line-height: 1.1; }
    .brand-name { font-size: 18px; font-weight: 800; color: var(--title); letter-spacing: 0.01em; }
    .brand-sub { font-size: 10px; font-weight: 600; letter-spacing: 0.22em; color: var(--muted); margin-top: 4px; }

    .nav-links { display: flex; align-items: center; gap: 4px; margin-left: auto; }
    .nav-links a {
      position: relative;
      padding: 9px 14px;
      border-radius: 9px;
      font-size: 14.5px;
      font-weight: 500;
      color: #475569;
      transition: color 0.2s, background 0.2s;
    }
    .nav-links a:hover { color: var(--blue-700); background: var(--blue-50); }
    .nav-links a.active { color: var(--blue-700); background: var(--blue-50); font-weight: 600; }

    .nav-actions { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }

    .nav-toggle {
      display: none;
      width: 42px; height: 42px;
      border: 1px solid var(--line);
      border-radius: 11px;
      background: #fff;
      color: var(--title);
      cursor: pointer;
      place-items: center;
    }
    .nav-toggle:active { background: var(--blue-50); }

    /* ============ Hero ============ */
    .hero {
      position: relative;
      padding: 148px 0 88px;
      overflow: hidden;
      background:
        radial-gradient(900px 520px at 78% -8%, rgba(6, 182, 212, 0.14), transparent 65%),
        radial-gradient(760px 480px at 8% 6%, rgba(37, 99, 235, 0.13), transparent 62%),
        linear-gradient(180deg, #f8fbff 0%, #ffffff 72%);
    }
    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image:
        linear-gradient(rgba(37, 99, 235, 0.055) 1px, transparent 1px),
        linear-gradient(90deg, rgba(37, 99, 235, 0.055) 1px, transparent 1px);
      background-size: 46px 46px;
      -webkit-mask-image: radial-gradient(720px 460px at 50% 0%, #000 20%, transparent 78%);
      mask-image: radial-gradient(720px 460px at 50% 0%, #000 20%, transparent 78%);
      pointer-events: none;
    }
    .hero-grid {
      position: relative;
      display: grid;
      grid-template-columns: 1.06fr 0.94fr;
      gap: 56px;
      align-items: center;
    }
    .hero-copy h1 {
      font-size: clamp(32px, 4.4vw, 54px);
      line-height: 1.16;
      letter-spacing: -0.025em;
      margin-bottom: 22px;
    }
    .hero-copy p.lead {
      font-size: 17px;
      color: var(--muted);
      max-width: 540px;
      margin-bottom: 30px;
    }
    .hero-cta { display: flex; flex-wrap: wrap; gap: 12px; }
    .hero-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 10px 22px;
      margin-top: 30px;
      font-size: 13.5px;
      color: var(--muted);
    }
    .hero-meta span { display: inline-flex; align-items: center; gap: 7px; }
    .hero-meta .icon { width: 16px; height: 16px; color: var(--blue-600); }

    /* 手机模拟 */
    .hero-visual { position: relative; display: flex; justify-content: center; }
    .hero-visual::before {
      content: "";
      position: absolute;
      width: 420px; height: 420px;
      left: 50%; top: 52%;
      transform: translate(-50%, -50%);
      background: radial-gradient(circle, rgba(37, 99, 235, 0.2), transparent 68%);
      filter: blur(18px);
      z-index: 0;
    }
    .phone {
      position: relative;
      z-index: 1;
      width: 274px;
      height: 548px;
      padding: 9px;
      border-radius: 42px;
      background: linear-gradient(160deg, #1e293b, #0b1220 60%);
      box-shadow: 0 40px 80px -20px rgba(15, 23, 42, 0.45), inset 0 0 0 1px rgba(255, 255, 255, 0.12);
    }
    .phone-screen {
      position: relative;
      height: 100%;
      border-radius: 34px;
      background: #f6f8fc;
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .phone-notch {
      position: absolute;
      top: 8px; left: 50%;
      transform: translateX(-50%);
      width: 88px; height: 20px;
      border-radius: 0 0 12px 12px;
      background: #0b1220;
      z-index: 3;
    }
    .app-head {
      padding: 34px 16px 16px;
      background: linear-gradient(150deg, #2563eb, #1d4ed8 60%, #0e7490);
      color: #fff;
      border-radius: 0 0 20px 20px;
    }
    .app-top { display: flex; align-items: center; justify-content: space-between; font-size: 12px; font-weight: 600; }
    .app-loc { display: inline-flex; align-items: center; gap: 5px; opacity: 0.95; }
    .app-loc svg { width: 13px; height: 13px; stroke: currentColor; fill: none; stroke-width: 2; }
    .app-avatar {
      width: 24px; height: 24px;
      border-radius: 50%;
      background: rgba(255, 255, 255, 0.25);
      border: 1px solid rgba(255, 255, 255, 0.4);
    }
    .app-search {
      margin-top: 12px;
      height: 32px;
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.94);
      color: #94a3b8;
      font-size: 10.5px;
      display: flex;
      align-items: center;
      gap: 6px;
      padding: 0 12px;
    }
    .app-search svg { width: 12px; height: 12px; stroke: #64748b; fill: none; stroke-width: 2.4; }

    .app-body { padding: 12px 12px 0; flex: 1; overflow: hidden; }
    .app-banner {
      border-radius: 11px;
      padding: 10px 12px;
      background: linear-gradient(110deg, #0ea5e9, #2563eb);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: 0 8px 18px rgba(37, 99, 235, 0.24);
    }
    .app-banner b { display: block; font-size: 12px; letter-spacing: 0.01em; }
    .app-banner small { font-size: 8.5px; opacity: 0.85; }
    .app-banner span {
      font-size: 9px;
      font-weight: 700;
      padding: 4px 9px;
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.22);
      border: 1px solid rgba(255, 255, 255, 0.35);
    }
    .app-cats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 8px 4px;
      margin: 12px 0 10px;
    }
    .app-cat { display: flex; flex-direction: column; align-items: center; gap: 5px; font-size: 8.5px; color: #475569; font-weight: 600; }
    .app-cat i {
      width: 30px; height: 30px;
      border-radius: 10px;
      background: #fff;
      box-shadow: 0 2px 8px rgba(15, 23, 42, 0.07);
      display: grid;
      place-items: center;
      color: var(--blue-600);
      font-size: 13px;
      font-style: normal;
    }
    .app-cat:nth-child(2) i { color: #0891b2; }
    .app-cat:nth-child(3) i { color: #7c3aed; }
    .app-cat:nth-child(4) i { color: #ea580c; }
    .app-cat:nth-child(5) i { color: #059669; }
    .app-cat:nth-child(6) i { color: #db2777; }
    .app-cat:nth-child(7) i { color: #ca8a04; }
    .app-cat:nth-child(8) i { color: #475569; }

    .app-sec-title { font-size: 9.5px; font-weight: 700; color: #0f172a; margin-bottom: 6px; display: flex; justify-content: space-between; }
    .app-sec-title em { font-style: normal; color: #94a3b8; font-weight: 500; font-size: 8px; }
    .app-item {
      display: flex;
      gap: 8px;
      padding: 8px;
      border-radius: 10px;
      background: #fff;
      margin-bottom: 6px;
      box-shadow: 0 2px 8px rgba(15, 23, 42, 0.04);
    }
    .app-thumb { width: 38px; height: 38px; border-radius: 8px; background: linear-gradient(135deg, #dbeafe, #bfdbfe); flex-shrink: 0; position: relative; overflow: hidden; }
    .app-thumb::after { content: ""; position: absolute; inset: 30% 30% auto auto; width: 18px; height: 18px; border-radius: 50%; background: rgba(37, 99, 235, 0.35); }
    .app-item:nth-of-type(2) .app-thumb { background: linear-gradient(135deg, #ecfdf5, #a7f3d0); }
    .app-item:nth-of-type(2) .app-thumb::after { background: rgba(5, 150, 105, 0.3); }
    .app-info { flex: 1; min-width: 0; }
    .app-info b { display: block; font-size: 9.5px; color: #0f172a; }
    .app-info small { font-size: 8px; color: #94a3b8; display: block; margin-top: 2px; }
    .app-price { font-size: 9px; font-weight: 700; color: #ef4444; align-self: center; }
    .app-tabbar {
      height: 44px;
      background: #fff;
      border-top: 1px solid #eef2f7;
      display: flex;
      align-items: center;
      justify-content: space-around;
      font-size: 8px;
      color: #94a3b8;
      padding-bottom: 6px;
    }
    .app-tabbar div { display: flex; flex-direction: column; align-items: center; gap: 3px; }
    .app-tabbar i { width: 14px; height: 14px; border-radius: 4px; background: #cbd5e1; }
    .app-tabbar div:first-child { color: var(--blue-600); font-weight: 700; }
    .app-tabbar div:first-child i { background: var(--blue-600); }

    .float-card {
      position: absolute;
      z-index: 2;
      background: rgba(255, 255, 255, 0.94);
      border: 1px solid var(--line);
      border-radius: 15px;
      box-shadow: var(--shadow-lg);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      padding: 13px 15px;
      animation: floaty 6s ease-in-out infinite;
    }
    .float-a { top: 46px; left: 0; width: 158px; }
    .float-b { bottom: 74px; right: 0; animation-delay: -3s; display: flex; align-items: center; gap: 9px; font-size: 12.5px; font-weight: 600; color: var(--title); }
    .float-a .fc-label { font-size: 11px; color: var(--muted); margin-bottom: 3px; }
    .float-a .fc-value { font-size: 23px; font-weight: 800; color: var(--title); letter-spacing: -0.02em; }
    .float-a .fc-value em { font-style: normal; font-size: 11px; color: #16a34a; font-weight: 700; margin-left: 6px; }
    .spark { display: flex; align-items: flex-end; gap: 3px; height: 26px; margin-top: 9px; }
    .spark i { flex: 1; border-radius: 3px 3px 2px 2px; background: linear-gradient(180deg, var(--blue-500), var(--blue-200)); }
    .float-b .pulse {
      width: 8px; height: 8px;
      border-radius: 50%;
      background: #22c55e;
      box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.5);
      animation: pulse 2s infinite;
    }

    @keyframes floaty {
      0%, 100% { transform: translateY(0); }
      50% { transform: translateY(-10px); }
    }
    @keyframes pulse {
      70% { box-shadow: 0 0 0 9px rgba(34, 197, 94, 0); }
      100% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0); }
    }

    /* ============ 数据条 ============ */
    .stats-wrap { position: relative; margin-top: -34px; z-index: 3; }
    .stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 20px;
      box-shadow: var(--shadow);
      overflow: hidden;
    }
    .stat { padding: 28px 20px; text-align: center; position: relative; }
    .stat + .stat::before {
      content: "";
      position: absolute;
      left: 0; top: 26%;
      height: 48%;
      width: 1px;
      background: var(--line);
    }
    .stat-value { font-size: clamp(24px, 2.6vw, 32px); font-weight: 800; color: var(--title); letter-spacing: -0.02em; line-height: 1.2; }
    .stat-value small { font-size: 15px; font-weight: 700; margin-left: 2px; color: var(--blue-600); }
    .stat-label { font-size: 13px; color: var(--muted); margin-top: 6px; }

    /* ============ 产品矩阵 ============ */
    .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }

    .product-card {
      position: relative;
      padding: 28px 26px;
      background: #fff;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), border-color 0.35s;
      overflow: hidden;
    }
    .product-card::after {
      content: "";
      position: absolute;
      inset: auto -30% -60% auto;
      width: 180px; height: 180px;
      background: radial-gradient(circle, rgba(37, 99, 235, 0.12), transparent 70%);
      opacity: 0;
      transition: opacity 0.35s;
      pointer-events: none;
    }
    .product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: var(--blue-200); }
    .product-card:hover::after { opacity: 1; }

    .icon-tile {
      width: 48px; height: 48px;
      border-radius: 14px;
      display: grid;
      place-items: center;
      background: linear-gradient(140deg, var(--blue-50), #e0f2fe);
      color: var(--blue-600);
      border: 1px solid var(--blue-100);
      margin-bottom: 18px;
    }
    .icon-tile.tone-cyan { background: linear-gradient(140deg, #ecfeff, #cffafe); color: #0891b2; border-color: #cffafe; }
    .icon-tile.tone-violet { background: linear-gradient(140deg, #f5f3ff, #ede9fe); color: #7c3aed; border-color: #ede9fe; }
    .icon-tile.tone-orange { background: linear-gradient(140deg, #fff7ed, #ffedd5); color: #ea580c; border-color: #ffedd5; }
    .icon-tile.tone-green { background: linear-gradient(140deg, #ecfdf5, #d1fae5); color: #059669; border-color: #d1fae5; }
    .icon-tile.tone-slate { background: linear-gradient(140deg, #f8fafc, #e2e8f0); color: #475569; border-color: #e2e8f0; }

    .product-card h3 { font-size: 18px; margin-bottom: 9px; }
    .product-card p { font-size: 14.5px; color: var(--muted); }
    .tag-row { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 16px; }
    .tag {
      font-size: 12px;
      font-weight: 600;
      color: var(--blue-700);
      background: var(--blue-50);
      border: 1px solid var(--blue-100);
      padding: 3px 10px;
      border-radius: 999px;
    }

    /* ============ 解决方案 ============ */
    .solution-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .solution {
      display: flex;
      gap: 16px;
      align-items: flex-start;
      padding: 24px;
      border-radius: var(--radius);
      background: #fff;
      border: 1px solid var(--line);
      transition: transform 0.3s var(--ease), box-shadow 0.3s, border-color 0.3s;
    }
    .solution:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--blue-200); }
    .solution-icon {
      width: 44px; height: 44px;
      flex-shrink: 0;
      border-radius: 12px;
      display: grid;
      place-items: center;
      color: var(--blue-600);
      background: var(--blue-50);
      border: 1px solid var(--blue-100);
    }
    .solution h3 { font-size: 16.5px; margin-bottom: 6px; display: flex; align-items: baseline; gap: 8px; }
    .solution h3 em { font-style: normal; font-size: 11px; font-weight: 700; color: #cbd5e1; letter-spacing: 0.08em; }
    .solution p { font-size: 13.8px; color: var(--muted); }

    /* ============ 核心优势 ============ */
    .why-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .why {
      padding: 26px;
      border-radius: var(--radius);
      background: #fff;
      border: 1px solid var(--line);
      position: relative;
      overflow: hidden;
      transition: transform 0.3s var(--ease), box-shadow 0.3s;
    }
    .why::before {
      content: "";
      position: absolute;
      inset: 0 auto 0 0;
      width: 3px;
      background: linear-gradient(180deg, var(--blue-600), var(--cyan));
      opacity: 0;
      transition: opacity 0.3s;
    }
    .why:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
    .why:hover::before { opacity: 1; }
    .why .icon-tile { width: 42px; height: 42px; border-radius: 12px; margin-bottom: 14px; }
    .why h3 { font-size: 16.5px; margin-bottom: 7px; }
    .why p { font-size: 14px; color: var(--muted); }

    /* ============ 部署流程 ============ */
    .steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      position: relative;
    }
    .step { position: relative; padding-top: 10px; }
    .step-num {
      width: 46px; height: 46px;
      border-radius: 14px;
      background: #fff;
      border: 1px solid var(--blue-100);
      color: var(--blue-700);
      font-weight: 800;
      font-size: 15px;
      display: grid;
      place-items: center;
      box-shadow: 0 6px 16px rgba(37, 99, 235, 0.12);
      margin-bottom: 16px;
      position: relative;
      z-index: 1;
    }
    .step:not(:last-child)::after {
      content: "";
      position: absolute;
      top: 33px; left: 58px;
      right: -12px;
      height: 1px;
      background: repeating-linear-gradient(90deg, var(--blue-200) 0 6px, transparent 6px 12px);
    }
    .step h3 { font-size: 16.5px; margin-bottom: 6px; }
    .step p { font-size: 13.8px; color: var(--muted); }

    /* ============ 案例 ============ */
    .case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
    .case-card {
      background: #fff;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      overflow: hidden;
      transition: transform 0.35s var(--ease), box-shadow 0.35s;
    }
    .case-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
    .case-head {
      padding: 24px 24px 20px;
      background: linear-gradient(135deg, #eff6ff, #ecfeff);
      border-bottom: 1px solid var(--blue-100);
      position: relative;
      overflow: hidden;
    }
    .case-head::after {
      content: "";
      position: absolute;
      right: -40px; top: -40px;
      width: 150px; height: 150px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(37, 99, 235, 0.14), transparent 70%);
    }
    .case-tag { display: inline-block; font-size: 11.5px; font-weight: 700; color: var(--blue-700); background: #fff; border: 1px solid var(--blue-100); padding: 3px 10px; border-radius: 999px; margin-bottom: 14px; }
    .case-metric { display: flex; align-items: baseline; gap: 7px; }
    .case-metric strong { font-size: 34px; font-weight: 800; color: var(--blue-700); letter-spacing: -0.03em; line-height: 1.1; }
    .case-metric span { font-size: 13px; color: #475569; font-weight: 600; }
    .case-body { padding: 20px 24px 24px; }
    .case-body h3 { font-size: 16.5px; margin-bottom: 8px; }
    .case-body p { font-size: 13.8px; color: var(--muted); }
    .case-meta { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 16px; }
    .case-meta span { font-size: 12px; color: var(--muted); background: #f8fafc; border: 1px solid var(--line); border-radius: 7px; padding: 3px 9px; }
    .case-note { text-align: center; font-size: 12.5px; color: #94a3b8; margin-top: 24px; }

    /* ============ 关于我们 ============ */
    .about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
    .about-copy h2 { font-size: clamp(26px, 3vw, 36px); margin-bottom: 18px; }
    .about-copy > p { color: var(--muted); margin-bottom: 14px; font-size: 15.5px; }
    .value-list { display: grid; gap: 16px; margin-top: 26px; }
    .value-item { display: flex; gap: 12px; align-items: flex-start; }
    .value-item .icon-tile { width: 34px; height: 34px; border-radius: 10px; margin: 0; flex-shrink: 0; }
    .value-item .icon-tile .icon { width: 18px; height: 18px; }
    .value-item h4 { font-size: 15px; margin-bottom: 2px; }
    .value-item p { font-size: 13.5px; color: var(--muted); }

    .milestones {
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 22px;
      padding: 30px 30px 26px;
      box-shadow: var(--shadow);
    }
    .milestones h3 { font-size: 16px; margin-bottom: 6px; }
    .milestones > p { font-size: 13px; color: var(--muted); margin-bottom: 20px; }
    .timeline { position: relative; padding-left: 22px; }
    .timeline::before { content: ""; position: absolute; left: 5px; top: 6px; bottom: 14px; width: 2px; background: linear-gradient(180deg, var(--blue-200), var(--blue-50)); }
    .timeline li { position: relative; padding-bottom: 18px; }
    .timeline li:last-child { padding-bottom: 0; }
    .timeline li::before {
      content: "";
      position: absolute;
      left: -22px; top: 7px;
      width: 12px; height: 12px;
      border-radius: 50%;
      background: #fff;
      border: 3px solid var(--blue-500);
      box-shadow: 0 0 0 4px var(--blue-50);
    }
    .timeline time { display: block; font-size: 12.5px; font-weight: 700; color: var(--blue-600); margin-bottom: 2px; }
    .timeline span { font-size: 13.8px; color: #475569; }

    /* ============ 联系 ============ */
    .contact-section {
      position: relative;
      overflow: hidden;
      background:
        radial-gradient(720px 420px at 12% 10%, rgba(37, 99, 235, 0.1), transparent 62%),
        radial-gradient(640px 380px at 90% 90%, rgba(6, 182, 212, 0.12), transparent 60%),
        var(--bg);
    }
    .contact-grid { display: grid; grid-template-columns: 0.95fr 1.05fr; gap: 44px; align-items: stretch; }
    .contact-info h2 { font-size: clamp(26px, 3vw, 34px); margin-bottom: 14px; }
    .contact-info > p { color: var(--muted); font-size: 15.5px; margin-bottom: 28px; }
    .contact-list { display: grid; gap: 14px; }
    .contact-item {
      display: flex; align-items: center; gap: 14px;
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 14px;
      padding: 16px 18px;
      transition: border-color 0.25s, transform 0.25s var(--ease);
    }
    .contact-item:hover { border-color: var(--blue-200); transform: translateX(3px); }
    .contact-item .icon-tile { width: 40px; height: 40px; border-radius: 11px; margin: 0; flex-shrink: 0; }
    .contact-item small { display: block; font-size: 12px; color: var(--muted); }
    .contact-item strong { font-size: 15px; color: var(--title); font-weight: 600; }

    .contact-form {
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 22px;
      box-shadow: var(--shadow);
      padding: 32px;
    }
    .contact-form h3 { font-size: 19px; margin-bottom: 4px; }
    .contact-form > p { font-size: 13.5px; color: var(--muted); margin-bottom: 22px; }
    .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
    .field { display: flex; flex-direction: column; gap: 6px; }
    .field.full { grid-column: 1 / -1; }
    .field label { font-size: 13px; font-weight: 600; color: #475569; }
    .field label em { color: #ef4444; font-style: normal; margin-left: 2px; }
    .field input, .field select, .field textarea {
      width: 100%;
      padding: 11px 13px;
      border: 1.5px solid var(--line);
      border-radius: 10px;
      background: #fbfcfe;
      font: inherit;
      font-size: 14px;
      color: var(--title);
      outline: none;
      transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
      -webkit-appearance: none;
      appearance: none;
    }
    .field select {
      background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2' stroke-linecap='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
      background-repeat: no-repeat;
      background-position: right 12px center;
      padding-right: 36px;
    }
    .field input::placeholder, .field textarea::placeholder { color: #a7b3c4; }
    .field input:focus, .field select:focus, .field textarea:focus {
      border-color: var(--blue-500);
      background: #fff;
      box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1);
    }
    .field textarea { resize: vertical; min-height: 92px; }
    .field .err { font-size: 12px; color: #ef4444; display: none; }
    .field.invalid input { border-color: #ef4444; background: #fff; box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.08); }
    .field.invalid .err { display: block; }
    .form-foot { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-top: 18px; flex-wrap: wrap; }
    .form-foot small { font-size: 12px; color: #94a3b8; }
    .form-foot small a { color: var(--blue-600); font-weight: 600; }

    /* ============ 页脚 ============ */
    .site-footer { background: #0b1220; color: #94a3b8; padding: 62px 0 26px; }
    .footer-top { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 40px; padding-bottom: 40px; border-bottom: 1px solid rgba(148, 163, 184, 0.16); }
    .footer-brand .brand-name { color: #fff; }
    .footer-brand .brand-sub { color: #64748b; }
    .footer-brand p { font-size: 13.5px; margin: 16px 0 18px; max-width: 300px; line-height: 1.8; }
    .footer-social { display: flex; gap: 8px; }
    .footer-social a {
      width: 34px; height: 34px;
      border-radius: 9px;
      display: grid; place-items: center;
      background: rgba(148, 163, 184, 0.1);
      border: 1px solid rgba(148, 163, 184, 0.16);
      color: #cbd5e1;
      transition: background 0.25s, color 0.25s, transform 0.25s;
    }
    .footer-social a:hover { background: var(--blue-600); border-color: var(--blue-600); color: #fff; transform: translateY(-2px); }
    .footer-social .icon { width: 16px; height: 16px; }
    .footer-col h4 { color: #e2e8f0; font-size: 14px; font-weight: 600; margin-bottom: 14px; }
    .footer-col li + li { margin-top: 9px; }
    .footer-col a, .footer-col span { font-size: 13.5px; color: #94a3b8; transition: color 0.2s; }
    .footer-col a:hover { color: #fff; }
    .footer-contact li { display: flex; gap: 8px; align-items: flex-start; font-size: 13.5px; }
    .footer-contact .icon { width: 15px; height: 15px; margin-top: 4px; color: var(--blue-500); flex-shrink: 0; }
    .footer-bottom { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding-top: 22px; font-size: 12.5px; color: #64748b; }
    .footer-bottom a { color: #94a3b8; }
    .footer-bottom a:hover { color: #e2e8f0; }

    /* ============ 浮动按钮 / Toast ============ */
    .to-top {
      position: fixed;
      right: 22px;
      bottom: 26px;
      width: 44px; height: 44px;
      border-radius: 13px;
      border: 1px solid var(--line);
      background: #fff;
      color: var(--blue-700);
      box-shadow: var(--shadow);
      display: grid;
      place-items: center;
      cursor: pointer;
      opacity: 0;
      visibility: hidden;
      transform: translateY(10px);
      transition: all 0.3s var(--ease);
      z-index: 90;
    }
    .to-top.show { opacity: 1; visibility: visible; transform: none; }
    .to-top:hover { background: var(--blue-600); border-color: var(--blue-600); color: #fff; }

    .toast {
      position: fixed;
      left: 50%;
      bottom: 34px;
      transform: translate(-50%, 16px);
      background: #0f172a;
      color: #fff;
      font-size: 14px;
      font-weight: 500;
      padding: 12px 22px;
      border-radius: 11px;
      box-shadow: 0 18px 40px rgba(15, 23, 42, 0.28);
      opacity: 0;
      pointer-events: none;
      transition: all 0.35s var(--ease);
      z-index: 200;
      max-width: calc(100vw - 40px);
    }
    .toast.show { opacity: 1; transform: translate(-50%, 0); }
    .toast.success { background: #065f46; }
    .toast.error { background: #991b1b; }

    /* ============ 进场动画 ============ */
    .reveal { opacity: 0; transform: translateY(26px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
    .reveal.in { opacity: 1; transform: none; }
    .reveal.d1 { transition-delay: 0.08s; }
    .reveal.d2 { transition-delay: 0.16s; }
    .reveal.d3 { transition-delay: 0.24s; }
    .reveal.d4 { transition-delay: 0.32s; }
    .reveal.d5 { transition-delay: 0.4s; }

    /* 锚点偏移 */
    section[id] { scroll-margin-top: 88px; }

    /* ============ 响应式 ============ */
    @media (max-width: 1024px) {
      .section { padding: 76px 0; }
      .hero-grid { gap: 36px; }
      .grid-3, .solution-grid, .why-grid, .case-grid { grid-template-columns: repeat(2, 1fr); }
      .about-grid { grid-template-columns: 1fr; gap: 36px; }
      .footer-top { grid-template-columns: 1fr 1fr; gap: 32px; }
      .steps { grid-template-columns: repeat(2, 1fr); gap: 26px 18px; }
      .step:nth-child(2)::after { display: none; }
      .nav-links { gap: 0; }
      .nav-links a { padding: 9px 11px; font-size: 14px; }
    }

    @media (max-width: 960px) {
      .nav-links, .nav-actions .btn { display: none; }
      .nav-toggle { display: grid; }
      .nav-links.open {
        display: flex;
        position: absolute;
        top: 72px;
        left: 0; right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 2px;
        padding: 12px 16px 18px;
        background: #fff;
        border-bottom: 1px solid var(--line);
        box-shadow: 0 24px 40px -16px rgba(15, 23, 42, 0.2);
        margin: 0;
        max-height: calc(100vh - 72px);
        overflow-y: auto;
      }
      .nav-links.open a { padding: 13px 14px; font-size: 15px; border-radius: 10px; }
      .nav-links.open a + a { margin-top: 2px; }

      .hero { padding: 122px 0 72px; }
      .hero-grid { grid-template-columns: 1fr; }
      .hero-visual { display: none; }
      .hero-copy { max-width: 620px; }
      .hero-copy p.lead { font-size: 16px; }
      .stats { grid-template-columns: repeat(2, 1fr); }
      .stat:nth-child(3)::before { display: none; }
      .stat:nth-child(n + 3) { border-top: 1px solid var(--line); }
      .contact-grid { grid-template-columns: 1fr; }
      .contact-form { padding: 26px; }
    }

    @media (max-width: 640px) {
      .container { padding: 0 18px; }
      .section { padding: 60px 0; }
      .section-head { margin-bottom: 34px; }
      .section-head p { font-size: 15px; }
      .hero { padding: 112px 0 60px; }
      .hero-copy h1 { font-size: clamp(28px, 8.4vw, 38px); }
      .hero-cta { gap: 10px; }
      .hero-cta .btn { flex: 1 1 auto; justify-content: center; padding: 13px 18px; }
      .hero-meta { gap: 8px 16px; margin-top: 22px; }
      .grid-3, .solution-grid, .why-grid, .case-grid { grid-template-columns: 1fr; }
      .steps { grid-template-columns: 1fr; gap: 22px; }
      .step:not(:last-child)::after { display: none; }
      .step { display: grid; grid-template-columns: 46px 1fr; gap: 14px; padding-top: 0; }
      .step-num { margin-bottom: 0; }
      .form-grid { grid-template-columns: 1fr; }
      .form-foot { flex-direction: column; align-items: stretch; }
      .form-foot .btn { width: 100%; }
      .footer-top { grid-template-columns: 1fr; gap: 28px; }
      .footer-bottom { flex-direction: column; align-items: flex-start; }
      .stats-wrap { margin-top: -26px; }
      .stat { padding: 20px 12px; }
      .stat-value { font-size: 24px; }
      .stat-label { font-size: 12px; }
      .float-card { display: none; }
      .to-top { right: 16px; bottom: 18px; }
    }

    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
      .reveal { opacity: 1; transform: none; }
    }
  

    /* ============================================================
       App 下载 / 应用信息（App Store 审核用）
       ============================================================ */
    .app-band {
      position: relative;
      padding: 70px 0;
      overflow: hidden;
      color: #cbd5e1;
      background:
        radial-gradient(760px 420px at 82% 8%, rgba(6, 182, 212, 0.22), transparent 62%),
        radial-gradient(620px 420px at 8% 92%, rgba(37, 99, 235, 0.26), transparent 60%),
        linear-gradient(135deg, #0b1220, #12203a 58%, #0b1220);
    }
    .app-band::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image:
        linear-gradient(rgba(148, 163, 184, 0.07) 1px, transparent 1px),
        linear-gradient(90deg, rgba(148, 163, 184, 0.07) 1px, transparent 1px);
      background-size: 44px 44px;
      -webkit-mask-image: radial-gradient(700px 420px at 70% 20%, #000, transparent 80%);
      mask-image: radial-gradient(700px 420px at 70% 20%, #000, transparent 80%);
      pointer-events: none;
    }
    .app-band .container { position: relative; }
    .app-band-grid {
      display: grid;
      grid-template-columns: 1.12fr 0.88fr;
      gap: 46px;
      align-items: center;
    }
    .app-intro { display: flex; gap: 22px; align-items: flex-start; }
    .app-icon {
      width: 92px; height: 92px;
      flex-shrink: 0;
      border-radius: 23px;
      background: linear-gradient(145deg, #2563eb, #1d4ed8 45%, #06b6d4);
      box-shadow: 0 18px 40px -10px rgba(37, 99, 235, 0.7), inset 0 1px 0 rgba(255, 255, 255, 0.35);
      display: grid;
      place-items: center;
      color: #fff;
      font-size: 38px;
      font-weight: 800;
      letter-spacing: -0.02em;
      position: relative;
      overflow: hidden;
    }
    .app-icon::after {
      content: "";
      position: absolute;
      inset: auto -20% -40% auto;
      width: 80px; height: 80px;
      border-radius: 50%;
      background: rgba(255, 255, 255, 0.18);
    }
    .app-headline h2 {
      color: #fff;
      font-size: clamp(24px, 3.2vw, 34px);
      margin-bottom: 8px;
    }
    .app-headline p { font-size: 15px; color: #94a3b8; max-width: 520px; }
    .app-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
    .app-chips span {
      font-size: 12.5px;
      color: #cbd5e1;
      border: 1px solid rgba(148, 163, 184, 0.28);
      background: rgba(148, 163, 184, 0.1);
      padding: 4px 11px;
      border-radius: 999px;
    }
    .app-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
    .app-store-btn {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      padding: 11px 22px;
      border-radius: 14px;
      background: #fff;
      color: #0b1220;
      border: 1px solid #fff;
      transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
      box-shadow: 0 14px 30px -10px rgba(0, 0, 0, 0.6);
    }
    .app-store-btn:hover { transform: translateY(-2px); box-shadow: 0 20px 38px -12px rgba(0, 0, 0, 0.7); }
    .app-store-btn svg { width: 22px; height: 22px; }
    .app-store-btn small { display: block; font-size: 10.5px; color: #64748b; line-height: 1.2; letter-spacing: 0.03em; }
    .app-store-btn strong { display: block; font-size: 15px; font-weight: 700; color: #0b1220; line-height: 1.3; }
    .app-band .btn-outline-light {
      color: #e2e8f0;
      background: rgba(148, 163, 184, 0.08);
      border-color: rgba(148, 163, 184, 0.3);
      box-shadow: none;
    }
    .app-band .btn-outline-light:hover { background: rgba(148, 163, 184, 0.18); color: #fff; border-color: rgba(148, 163, 184, 0.5); }

    .app-spec {
      background: rgba(255, 255, 255, 0.045);
      border: 1px solid rgba(148, 163, 184, 0.22);
      border-radius: 20px;
      padding: 24px 26px;
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
    }
    .app-spec h3 { color: #e2e8f0; font-size: 15px; margin-bottom: 14px; display: flex; align-items: center; gap: 8px; }
    .app-spec h3::before {
      content: "";
      width: 6px; height: 6px;
      border-radius: 50%;
      background: #38bdf8;
      box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.18);
    }
    .spec-row {
      display: flex;
      justify-content: space-between;
      gap: 16px;
      padding: 9px 0;
      font-size: 13.5px;
      border-bottom: 1px dashed rgba(148, 163, 184, 0.18);
    }
    .spec-row:last-child { border-bottom: 0; padding-bottom: 0; }
    .spec-row dt { color: #94a3b8; flex-shrink: 0; }
    .spec-row dd { margin: 0; color: #e2e8f0; text-align: right; font-weight: 500; }
    .spec-row dd a { color: #7dd3fc; }
    .spec-row dd a:hover { text-decoration: underline; }

    /* ============================================================
       FAQ 折叠
       ============================================================ */
    .faq { max-width: 840px; margin: 0 auto; display: grid; gap: 10px; }
    .faq-item {
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 14px;
      overflow: hidden;
      transition: border-color 0.25s, box-shadow 0.25s;
    }
    .faq-item:hover { border-color: var(--blue-200); }
    .faq-item.open { border-color: var(--blue-200); box-shadow: var(--shadow-sm); }
    .faq-q {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      padding: 18px 22px;
      background: none;
      border: 0;
      cursor: pointer;
      text-align: left;
      font-size: 15.5px;
      font-weight: 600;
      color: var(--title);
      line-height: 1.5;
    }
    .faq-q::after {
      content: "+";
      flex-shrink: 0;
      width: 26px; height: 26px;
      border-radius: 8px;
      display: grid;
      place-items: center;
      background: var(--blue-50);
      color: var(--blue-600);
      font-size: 19px;
      font-weight: 400;
      line-height: 1;
      transition: transform 0.3s var(--ease), background 0.25s, color 0.25s;
    }
    .faq-item.open .faq-q::after { transform: rotate(45deg); background: var(--blue-600); color: #fff; }
    .faq-a {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s var(--ease);
    }
    .faq-a p {
      padding: 0 22px 20px;
      font-size: 14.5px;
      color: var(--muted);
      max-width: 720px;
    }
    .faq-a a { color: var(--blue-600); font-weight: 600; }
    .faq-a a:hover { text-decoration: underline; }

    /* ============================================================
       内页：页头 / 文档排版 / 支持卡片
       ============================================================ */
    .page-hero {
      position: relative;
      padding: 132px 0 54px;
      overflow: hidden;
      background:
        radial-gradient(720px 380px at 82% -10%, rgba(6, 182, 212, 0.13), transparent 62%),
        radial-gradient(620px 360px at 6% 0%, rgba(37, 99, 235, 0.12), transparent 60%),
        linear-gradient(180deg, #f8fbff, #fff);
      border-bottom: 1px solid var(--line);
    }
    .page-hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background-image:
        linear-gradient(rgba(37, 99, 235, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(37, 99, 235, 0.05) 1px, transparent 1px);
      background-size: 46px 46px;
      -webkit-mask-image: radial-gradient(680px 380px at 50% 0%, #000, transparent 78%);
      mask-image: radial-gradient(680px 380px at 50% 0%, #000, transparent 78%);
      pointer-events: none;
    }
    .page-hero .container { position: relative; }
    .breadcrumb { font-size: 13px; color: var(--muted); margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }
    .breadcrumb a { color: var(--blue-600); }
    .breadcrumb a:hover { text-decoration: underline; }
    .breadcrumb span { color: #cbd5e1; }
    .page-hero h1 { font-size: clamp(28px, 4vw, 40px); margin-bottom: 12px; }
    .page-hero p { color: var(--muted); font-size: 16px; max-width: 720px; }
    .page-hero .page-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
    .page-hero .page-meta span {
      font-size: 12.5px;
      color: #475569;
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 999px;
      padding: 4px 12px;
    }

    .doc-wrap {
      display: grid;
      grid-template-columns: 232px minmax(0, 1fr);
      gap: 48px;
      padding: 52px 0 84px;
      align-items: start;
    }
    .doc-nav {
      position: sticky;
      top: 94px;
      font-size: 14px;
      border-left: 1px solid var(--line);
      padding-left: 16px;
    }
    .doc-nav h3 { font-size: 12.5px; letter-spacing: 0.1em; color: #94a3b8; font-weight: 700; margin-bottom: 12px; text-transform: uppercase; }
    .doc-nav a {
      display: block;
      padding: 7px 12px;
      border-radius: 8px;
      color: #475569;
      transition: background 0.2s, color 0.2s;
      line-height: 1.5;
    }
    .doc-nav a + a { margin-top: 2px; }
    .doc-nav a:hover { background: var(--blue-50); color: var(--blue-700); }
    .doc-nav a.active { background: var(--blue-50); color: var(--blue-700); font-weight: 600; }

    .doc { min-width: 0; max-width: 840px; }
    .doc .doc-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 6px 22px;
      font-size: 13px;
      color: var(--muted);
      background: #f8fafc;
      border: 1px solid var(--line);
      border-radius: 12px;
      padding: 14px 18px;
      margin-bottom: 8px;
    }
    .doc .doc-meta b { color: #475569; font-weight: 600; }
    .doc h2 {
      font-size: 21px;
      margin: 38px 0 12px;
      scroll-margin-top: 96px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .doc h2::before {
      content: "";
      width: 4px;
      height: 18px;
      border-radius: 2px;
      background: linear-gradient(180deg, var(--blue-600), var(--cyan));
      flex-shrink: 0;
    }
    .doc h3 { font-size: 16px; margin: 22px 0 8px; }
    .doc p { font-size: 15px; color: #475569; line-height: 1.85; margin: 10px 0; }
    .doc ul { margin: 8px 0 12px; }
    .doc ul li {
      position: relative;
      padding-left: 18px;
      margin: 7px 0;
      font-size: 15px;
      color: #475569;
      line-height: 1.8;
    }
    .doc ul li::before {
      content: "";
      position: absolute;
      left: 4px;
      top: 12px;
      width: 5px;
      height: 5px;
      border-radius: 50%;
      background: var(--blue-500);
    }
    .doc a { color: var(--blue-600); font-weight: 500; }
    .doc a:hover { text-decoration: underline; }
    .doc strong { color: var(--title); font-weight: 600; }
    .doc-note {
      background: var(--blue-50);
      border: 1px solid var(--blue-100);
      border-radius: 12px;
      padding: 14px 18px;
      font-size: 14px;
      color: var(--blue-700);
      margin: 16px 0;
      line-height: 1.75;
    }
    .doc table { width: 100%; border-collapse: collapse; margin: 14px 0 18px; font-size: 14px; }
    .doc th, .doc td { border: 1px solid var(--line); padding: 10px 13px; text-align: left; vertical-align: top; color: #475569; }
    .doc th { background: #f8fafc; color: var(--title); font-weight: 600; white-space: nowrap; }
    .doc td { line-height: 1.7; }

    .support-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-bottom: 8px; }
    .support-card {
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 16px;
      padding: 24px;
      transition: transform 0.3s var(--ease), box-shadow 0.3s, border-color 0.3s;
    }
    .support-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--blue-200); }
    .support-card h3 { font-size: 16px; margin: 14px 0 6px; }
    .support-card p { font-size: 13.8px; color: var(--muted); }
    .support-card a.link { display: inline-flex; align-items: center; gap: 5px; margin-top: 12px; font-size: 13.5px; font-weight: 600; color: var(--blue-600); }
    .support-card a.link:hover { text-decoration: underline; }
    .support-card .icon-tile { margin-bottom: 0; }

    .support-split { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 34px; }
    .support-box {
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 16px;
      padding: 26px;
    }
    .support-box h3 { font-size: 17px; margin-bottom: 12px; }
    .support-box ol { margin: 0; padding-left: 18px; }
    .support-box li { font-size: 14px; color: var(--muted); margin: 8px 0; line-height: 1.75; }

    @media (max-width: 1024px) {
      .doc-wrap { grid-template-columns: 1fr; gap: 0; }
      .doc-nav { display: none; }
      .app-band-grid { grid-template-columns: 1fr; gap: 34px; }
    }
    @media (max-width: 960px) {
      .support-grid { grid-template-columns: 1fr; }
      .support-split { grid-template-columns: 1fr; }
    }
    @media (max-width: 640px) {
      .page-hero { padding: 108px 0 38px; }
      .page-hero p { font-size: 15px; }
      .doc-wrap { padding: 34px 0 60px; }
      .doc h2 { font-size: 19px; margin-top: 30px; }
      .app-band { padding: 52px 0; }
      .app-intro { flex-direction: column; gap: 16px; }
      .app-icon { width: 76px; height: 76px; border-radius: 19px; font-size: 30px; }
      .app-spec { padding: 20px; }
      .spec-row { font-size: 13px; }
      .app-actions .btn, .app-actions .app-store-btn { width: 100%; justify-content: center; }
      .faq-q { padding: 16px 18px; font-size: 14.5px; }
      .faq-a p { padding: 0 18px 18px; }
      .doc table { font-size: 13px; }
      .doc th, .doc td { padding: 8px 10px; }
    }

    .app-spec dl { margin: 0; }

    /* 中等屏幕：手机与浮动卡片会互相遮挡，隐藏装饰卡片 */
    @media (max-width: 1100px) and (min-width: 961px) {
      .float-card { display: none; }
    }