:root {
      --ink: #12323a;
      --muted: #5f777b;
      --teal: #087f82;
      --cyan: #18b7b0;
      --mint: #dff7f0;
      --pale: #f4fbf9;
      --line: #d7e9e5;
      --white: #ffffff;
      --navy: #123b45;
      --orange: #ee8b46;
      --shadow: 0 18px 45px rgba(16, 72, 76, .1);
      --radius: 18px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: #f7fcfb;
      font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
      line-height: 1.7;
    }
    a { color: inherit; text-decoration: none; }
    img { max-width: 100%; height: auto; display: block; }
    .container {
      width: min(1180px, calc(100% - 40px));
      margin: 0 auto;
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(255,255,255,.94);
      border-bottom: 1px solid rgba(215,233,229,.85);
      backdrop-filter: blur(12px);
    }
    .nav {
      min-height: 76px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }
    .brand {
      display: inline-flex;
      align-items: center;
      min-width: 160px;
    }
    .ai-page-logo { width: 142px; }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      flex-wrap: wrap;
      justify-content: flex-end;
    }
    .nav-links a {
      color: #36585d;
      font-size: 14px;
      padding: 8px 10px;
      transition: color .2s ease, background .2s ease;
    }
    .nav-links a:hover { color: var(--teal); background: var(--pale); }
    .nav-cta, .button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: 0;
      border-radius: 9px;
      background: var(--teal);
      color: #fff;
      padding: 12px 20px;
      font-weight: 700;
      cursor: pointer;
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    }
    .nav-cta:hover, .button:hover {
      background: #056c70;
      transform: translateY(-2px);
      box-shadow: 0 10px 20px rgba(8,127,130,.2);
    }
    .menu-toggle {
      display: none;
      border: 1px solid var(--line);
      background: #fff;
      color: var(--ink);
      border-radius: 8px;
      padding: 8px 11px;
      font-size: 20px;
    }
    .hero {
      position: relative;
      overflow: hidden;
      background: linear-gradient(135deg, #e8fbf7 0%, #f7fcfb 48%, #d8f2f2 100%);
      padding: 76px 0 72px;
    }
    .hero:before, .hero:after {
      content: "";
      position: absolute;
      border: 1px solid rgba(24,183,176,.22);
      transform: rotate(24deg);
      pointer-events: none;
    }
    .hero:before { width: 420px; height: 420px; right: -130px; top: -150px; border-radius: 44px; }
    .hero:after { width: 260px; height: 260px; left: -130px; bottom: -120px; border-radius: 50%; }
    .hero-grid {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: 1.1fr .9fr;
      gap: 52px;
      align-items: center;
    }
    .eyebrow, .section-kicker {
      color: var(--teal);
      font-size: 13px;
      font-weight: 800;
      letter-spacing: 1.5px;
      text-transform: uppercase;
    }
    h1, h2, h3, p { margin-top: 0; }
    h1 {
      max-width: 680px;
      margin-bottom: 20px;
      font-size: clamp(36px, 5vw, 64px);
      line-height: 1.15;
      letter-spacing: 0;
    }
    .hero-copy {
      max-width: 650px;
      color: #45666a;
      font-size: 18px;
    }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 34px; }
    .button.secondary { background: #fff; color: var(--teal); border: 1px solid #a9d9d1; }
    .button.secondary:hover { background: var(--mint); }
    .hero-note { color: #587477; font-size: 13px; }
    .hero-panel {
      border: 1px solid rgba(24,183,176,.28);
      background: rgba(255,255,255,.65);
      padding: 24px;
      border-radius: 24px;
      box-shadow: var(--shadow);
    }
    .signal {
      display: flex;
      gap: 14px;
      align-items: flex-start;
      padding: 15px 0;
      border-bottom: 1px solid var(--line);
    }
    .signal:last-child { border-bottom: 0; }
    .signal-mark {
      width: 34px;
      height: 34px;
      display: grid;
      place-items: center;
      flex: 0 0 34px;
      color: #fff;
      background: var(--teal);
      border-radius: 10px;
      font-weight: 800;
    }
    .signal strong { display: block; margin-bottom: 2px; }
    .signal span { color: var(--muted); font-size: 13px; }
    section { padding: 84px 0; }
    .section-head {
      max-width: 720px;
      margin-bottom: 34px;
    }
    h2 { margin-bottom: 12px; font-size: clamp(28px, 4vw, 42px); line-height: 1.2; }
    h3 { margin-bottom: 8px; font-size: 20px; }
    .lead { color: var(--muted); font-size: 16px; }
    .stats {
      margin-top: -1px;
      padding: 26px 0;
      background: var(--navy);
      color: #fff;
    }
    .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
    .stat { padding: 8px 18px; border-left: 1px solid rgba(255,255,255,.2); }
    .stat strong { display: block; color: #81eee2; font-size: 30px; line-height: 1.2; }
    .stat span { color: #c6e1df; font-size: 13px; }
    .about-grid, .contact-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 42px; align-items: start; }
    .about-text { font-size: 17px; color: #49676b; }
    .highlight-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; margin-top: 24px; }
    .highlight {
      padding: 17px;
      background: #fff;
      border: 1px solid var(--line);
      border-left: 4px solid var(--cyan);
      border-radius: 10px;
    }
    .card-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .card {
      padding: 24px;
      background: #fff;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      box-shadow: 0 8px 24px rgba(16,72,76,.04);
      transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
    }
    .card:hover { transform: translateY(-5px); border-color: #9bdad2; box-shadow: var(--shadow); }
    .card p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .service-tag {
      display: inline-block;
      padding: 5px 10px;
      margin-bottom: 14px;
      border-radius: 6px;
      color: #087f82;
      background: var(--mint);
      font-size: 12px;
      font-weight: 700;
    }
    .service-grid .card { min-height: 190px; }
    .soft-band { background: #edf9f6; }
    .workflow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; }
    .step { position: relative; padding: 10px 18px 10px 0; }
    .step:not(:last-child):after {
      content: "→";
      position: absolute;
      right: 8px;
      top: 31px;
      color: var(--cyan);
      font-size: 24px;
    }
    .step-num {
      width: 42px;
      height: 42px;
      display: grid;
      place-items: center;
      margin-bottom: 16px;
      color: #fff;
      background: var(--teal);
      border-radius: 50%;
      font-weight: 800;
    }
    .step p { color: var(--muted); font-size: 14px; }
    .solution-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
    .solution {
      padding: 24px;
      display: flex;
      gap: 18px;
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 14px;
    }
    .solution-icon { color: var(--teal); font-size: 26px; font-weight: 800; }
    .solution p { color: var(--muted); margin-bottom: 0; font-size: 14px; }
    .network {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      padding: 24px;
      background: var(--navy);
      border-radius: 18px;
    }
    .network span {
      padding: 8px 13px;
      border: 1px solid rgba(255,255,255,.2);
      border-radius: 7px;
      color: #e6fffa;
      background: rgba(255,255,255,.07);
      font-size: 13px;
    }
    .media-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 18px; }
    .media-tile { overflow: hidden; border-radius: 14px; background: #fff; border: 1px solid var(--line); }
    .media-tile img { width: 100%; aspect-ratio: 16 / 8; object-fit: cover; }
    .media-tile.square img { aspect-ratio: 1 / 1; }
    .media-tile figcaption { padding: 15px 18px; font-size: 14px; color: var(--muted); }
    .comparison-wrap { overflow-x: auto; background: #fff; border: 1px solid var(--line); border-radius: 16px; }
    table { width: 100%; min-width: 720px; border-collapse: collapse; }
    th, td { padding: 16px; text-align: left; border-bottom: 1px solid var(--line); }
    th { background: #e8f8f4; color: var(--ink); }
    td { color: var(--muted); font-size: 14px; }
    tr:last-child td { border-bottom: 0; }
    .score-box {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      margin-bottom: 22px;
      padding: 22px 26px;
      color: #fff;
      background: var(--navy);
      border-radius: 16px;
    }
    .score { color: #8df1e3; font-size: 36px; font-weight: 800; }
    .stars { color: #ffd36b; letter-spacing: 3px; font-size: 20px; }
    .match-box {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      padding: 30px;
      background: linear-gradient(120deg, #e0f8f1, #fff);
      border: 1px solid #bce6dc;
      border-radius: 20px;
    }
    .match-points { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
    .match-points div { padding: 12px; color: #426469; background: rgba(255,255,255,.75); border-radius: 8px; font-size: 14px; }
    .price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .price-card { padding: 24px; background: #fff; border-top: 4px solid var(--cyan); border-radius: 12px; box-shadow: 0 8px 25px rgba(16,72,76,.06); }
    .price-card strong { display: block; color: var(--teal); font-size: 27px; margin: 10px 0; }
    .price-card p { margin-bottom: 0; color: var(--muted); font-size: 14px; }
    .faq-list { display: grid; gap: 10px; max-width: 900px; }
    details { background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 0 18px; }
    summary { padding: 17px 0; cursor: pointer; font-weight: 700; list-style-position: inside; }
    details p { padding: 0 0 17px 24px; margin-bottom: 0; color: var(--muted); font-size: 14px; }
    .reviews { grid-template-columns: repeat(3, 1fr); }
    .review-role { color: var(--teal); font-size: 13px; font-weight: 700; }
    .review p { color: #49676b; font-size: 14px; }
    .review cite { color: #819498; font-size: 13px; font-style: normal; }
    .article-list { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
    .article-list a { padding: 16px; background: #fff; border: 1px solid var(--line); border-radius: 10px; color: var(--teal); font-size: 14px; }
    .article-list a:hover { background: var(--mint); }
    .form-card { padding: 28px; background: #fff; border: 1px solid var(--line); border-radius: 18px; }
    .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
    label { display: grid; gap: 6px; color: #45666a; font-size: 14px; font-weight: 700; }
    input, select, textarea {
      width: 100%;
      border: 1px solid #c9dfdb;
      border-radius: 8px;
      padding: 12px 13px;
      color: var(--ink);
      background: #fbfffe;
      font: inherit;
      outline: none;
    }
    input:focus, select:focus, textarea:focus { border-color: var(--teal); box-shadow: 0 0 0 3px rgba(24,183,176,.12); }
    .full { grid-column: 1 / -1; }
    textarea { min-height: 130px; resize: vertical; }
    .contact-info { padding-top: 10px; }
    .contact-item { padding: 14px 0; border-bottom: 1px solid var(--line); }
    .contact-item strong { display: block; margin-bottom: 3px; }
    .contact-item span { color: var(--muted); font-size: 14px; }
    .qr { width: 142px; margin-top: 10px; border-radius: 8px; }
    .footer {
      padding: 42px 0 24px;
      color: #d7eeeb;
      background: #103d46;
    }
    .footer-grid { display: grid; grid-template-columns: 1.1fr .9fr 1.2fr; gap: 34px; }
    .footer h3 { color: #fff; font-size: 17px; }
    .footer p, .footer a { color: #b9d8d4; font-size: 14px; }
    .footer a:hover { color: #fff; }
    .links { display: flex; flex-wrap: wrap; gap: 10px 18px; }
    .copyright { margin-top: 32px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.15); color: #9fc4c0; font-size: 13px; }
    .float-contact, .to-top {
      position: fixed;
      right: 20px;
      z-index: 15;
      border: 0;
      cursor: pointer;
      box-shadow: 0 10px 25px rgba(8,75,78,.2);
    }
    .float-contact { bottom: 74px; padding: 12px 15px; color: #fff; background: var(--orange); border-radius: 10px; }
    .to-top { display: none; bottom: 20px; width: 40px; height: 40px; color: #fff; background: var(--teal); border-radius: 50%; }
    .reveal { opacity: 0; transform: translateY(18px); transition: opacity .65s ease, transform .65s ease; }
    .reveal.visible { opacity: 1; transform: none; }
    @media (max-width: 980px) {
      .nav-links { display: none; position: absolute; top: 76px; left: 0; right: 0; padding: 12px 20px 20px; background: #fff; border-bottom: 1px solid var(--line); }
      .nav-links.open { display: grid; grid-template-columns: repeat(2, 1fr); }
      .nav-links a { padding: 11px; }
      .menu-toggle { display: block; }
      .hero-grid, .about-grid, .contact-grid, .match-box { grid-template-columns: 1fr; }
      .card-grid, .reviews { grid-template-columns: repeat(2, 1fr); }
      .workflow { grid-template-columns: repeat(3, 1fr); gap: 20px; }
      .step:not(:last-child):after { display: none; }
      .article-list { grid-template-columns: repeat(3, 1fr); }
    }
    @media (max-width: 640px) {
      .container { width: min(100% - 28px, 1180px); }
      section { padding: 58px 0; }
      .hero { padding: 54px 0 58px; }
      .hero-copy { font-size: 16px; }
      .stats-grid, .card-grid, .reviews, .solution-grid, .price-grid, .footer-grid { grid-template-columns: 1fr; }
      .highlight-list, .match-points, .form-grid { grid-template-columns: 1fr; }
      .workflow { grid-template-columns: 1fr; }
      .media-grid { grid-template-columns: 1fr; }
      .article-list { grid-template-columns: 1fr 1fr; }
      .score-box { align-items: flex-start; flex-direction: column; }
      .full { grid-column: auto; }
      h1 { font-size: 38px; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *:before, *:after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
    }