:root {
      --ink: #172238;
      --muted: #607087;
      --paper: #fffdf8;
      --blue: #3155ed;
      --cyan: #bff7f0;
      --coral: #ff715b;
      --yellow: #ffd84d;
      --lime: #d7f46a;
      --line: #dfe5ed;
      --soft: #f4f7fb;
      --shadow: 0 18px 45px rgba(23,34,56,.09);
      --radius: 16px;
      --container: 1180px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
      line-height: 1.7;
    }
    a { color: inherit; text-decoration: none; }
    img { max-width: 100%; height: auto; display: block; }
    button, input, select, textarea { font: inherit; }
    .container { width: min(var(--container), calc(100% - 40px)); margin: 0 auto; }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(255,253,248,.93);
      border-bottom: 1px solid rgba(223,229,237,.85);
      backdrop-filter: blur(14px);
    }
    .nav-wrap { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
    .brand { display: inline-flex; align-items: center; min-width: 150px; }
    .ai-page-logo { width: 132px; }
    .nav-links { display: flex; align-items: center; gap: 0; flex-wrap: wrap; justify-content: flex-end; }
    .nav-links a { padding: 10px 9px; font-size: 13px; color: #41506a; transition: color .2s ease; }
    .nav-links a:hover { color: var(--blue); }
    .nav-action, .primary-btn {
      display: inline-flex; align-items: center; justify-content: center;
      border: 0; border-radius: 8px; padding: 12px 19px; font-weight: 700;
      background: var(--blue); color: #fff; box-shadow: 0 9px 20px rgba(49,85,237,.2);
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    }
    .nav-action:hover, .primary-btn:hover { transform: translateY(-2px); background: #1f3ed0; box-shadow: 0 13px 24px rgba(49,85,237,.25); }
    .menu-toggle { display: none; border: 1px solid var(--line); background: #fff; color: var(--ink); border-radius: 8px; padding: 8px 11px; }
    .hero {
      overflow: hidden;
      position: relative;
      padding: 92px 0 74px;
      background:
        linear-gradient(135deg, #fffdf8 0%, #fff7d9 46%, #dffaf4 100%);
      border-bottom: 1px solid #e8e3d4;
    }
    .hero:before, .hero:after {
      content: ""; position: absolute; border-radius: 50%; pointer-events: none;
    }
    .hero:before { width: 330px; height: 330px; right: -130px; top: 80px; background: var(--coral); opacity: .17; }
    .hero:after { width: 180px; height: 180px; left: -70px; bottom: -80px; background: var(--blue); opacity: .1; }
    .hero-grid { position: relative; display: grid; grid-template-columns: minmax(0,1.2fr) minmax(320px,.8fr); gap: 60px; align-items: center; }
    .eyebrow, .section-kicker {
      display: inline-flex; align-items: center; gap: 8px; color: var(--blue); font-size: 13px; font-weight: 800; letter-spacing: .04em;
    }
    .eyebrow:before, .section-kicker:before { content: ""; width: 28px; height: 4px; background: var(--coral); border-radius: 4px; }
    h1, h2, h3, p { margin-top: 0; }
    h1 { max-width: 700px; margin-bottom: 22px; font-size: clamp(38px, 6vw, 70px); line-height: 1.08; letter-spacing: 0; }
    .hero-copy { max-width: 650px; color: #44526a; font-size: 18px; }
    .hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 30px; }
    .ghost-btn { display: inline-flex; align-items: center; justify-content: center; border: 1px solid var(--ink); border-radius: 8px; padding: 11px 18px; font-weight: 700; background: transparent; }
    .ghost-btn:hover { background: #fff; }
    .hero-panel { background: var(--ink); color: #fff; padding: 28px; border-radius: 20px 20px 20px 4px; box-shadow: var(--shadow); transform: rotate(1.2deg); }
    .hero-panel h2 { font-size: 22px; margin-bottom: 18px; }
    .signal { display: grid; grid-template-columns: repeat(2,1fr); gap: 12px; }
    .signal-item { padding: 15px; background: #293752; border-left: 4px solid var(--yellow); border-radius: 8px; }
    .signal-item strong { display: block; font-size: 24px; color: var(--yellow); line-height: 1.2; }
    .signal-item span { color: #d8e0ed; font-size: 13px; }
    .trust-bar { position: relative; margin-top: 58px; display: grid; grid-template-columns: repeat(4,1fr); gap: 1px; background: #cfd7df; border: 1px solid #cfd7df; }
    .trust-item { background: rgba(255,255,255,.76); padding: 20px; }
    .trust-item strong { display: block; font-size: 28px; }
    .trust-item span { color: var(--muted); font-size: 13px; }
    section { padding: 88px 0; }
    .section-head { max-width: 720px; margin-bottom: 38px; }
    .section-head h2 { margin: 9px 0 12px; font-size: clamp(28px, 4vw, 44px); line-height: 1.16; }
    .section-head p { color: var(--muted); margin-bottom: 0; }
    .about { background: #f3f8fb; }
    .about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 46px; align-items: start; }
    .about-lead { font-size: 22px; line-height: 1.5; }
    .check-list { display: grid; gap: 13px; margin: 0; padding: 0; list-style: none; }
    .check-list li { padding: 15px 18px 15px 48px; background: #fff; border-left: 5px solid var(--coral); position: relative; box-shadow: 0 8px 22px rgba(23,34,56,.05); }
    .check-list li:before { content: "✓"; position: absolute; left: 17px; color: var(--blue); font-weight: 900; }
    .service-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 16px; }
    .service-card { padding: 22px; background: #fff; border: 1px solid var(--line); border-top: 5px solid var(--blue); box-shadow: 0 8px 24px rgba(23,34,56,.05); transition: transform .25s ease, box-shadow .25s ease; }
    .service-card:nth-child(3n+2) { border-top-color: var(--coral); }
    .service-card:nth-child(3n+3) { border-top-color: #73cdbf; }
    .service-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
    .service-card h3 { margin-bottom: 8px; font-size: 19px; }
    .service-card p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .workflow { background: var(--ink); color: #fff; }
    .workflow .section-head p { color: #bdc9dc; }
    .step-grid { display: grid; grid-template-columns: repeat(5,1fr); gap: 12px; }
    .step { padding: 22px 17px; background: #263550; border-bottom: 4px solid var(--yellow); }
    .step:nth-child(even) { border-bottom-color: var(--coral); }
    .step b { display: block; color: var(--yellow); font-size: 29px; margin-bottom: 10px; }
    .step h3 { font-size: 17px; margin-bottom: 8px; }
    .step p { color: #cbd6e8; font-size: 13px; margin: 0; }
    .band { background: #fff5d2; }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 10px; }
    .tag { padding: 9px 14px; border: 1px solid #e4c65a; background: #fffdf3; border-radius: 20px; font-size: 14px; }
    .highlight-layout { display: grid; grid-template-columns: .85fr 1.15fr; gap: 40px; align-items: center; }
    .highlight-box { padding: 30px; background: var(--coral); color: #fff; border-radius: 4px 24px 4px 24px; }
    .highlight-box h2 { font-size: 34px; line-height: 1.15; }
    .highlight-box p { color: #fff8f3; }
    .highlight-box .primary-btn { background: #fff; color: var(--ink); box-shadow: none; }
    .network { background: #e9fbf7; }
    .network-list { display: grid; grid-template-columns: repeat(4,1fr); gap: 12px; }
    .network-item { background: #fff; padding: 16px; border-bottom: 3px solid #6ac9bb; }
    .network-item strong { display: block; margin-bottom: 4px; }
    .network-item span { font-size: 13px; color: var(--muted); }
    .compare-wrap { overflow-x: auto; border: 1px solid var(--line); background: #fff; }
    table { width: 100%; min-width: 760px; border-collapse: collapse; }
    th, td { padding: 16px 18px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
    th { background: #eff3ff; color: var(--blue); }
    tr:last-child td { border-bottom: 0; }
    .rating { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; }
    .rating strong { font-size: 42px; color: var(--coral); line-height: 1; }
    .stars { color: #efad00; letter-spacing: 2px; font-size: 23px; }
    .case-grid, .review-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
    .case-card { overflow: hidden; background: #fff; border: 1px solid var(--line); }
    .media-box { aspect-ratio: 16/9; overflow: hidden; background: #edf1f6; }
    .media-box img { width: 100%; height: 100%; object-fit: cover; }
    .case-body { padding: 19px; }
    .case-body h3 { margin-bottom: 7px; }
    .case-body p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .review-card { padding: 22px; background: #fff; border: 1px solid var(--line); position: relative; }
    .review-card:before { content: "“"; position: absolute; right: 16px; top: 4px; font-size: 54px; color: var(--cyan); line-height: 1; }
    .review-card p { color: #46546a; font-size: 14px; }
    .review-card strong { display: block; font-size: 14px; }
    .review-card span { color: var(--muted); font-size: 12px; }
    .pricing { display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; }
    .price-card { padding: 24px; border: 1px solid var(--line); background: #fff; }
    .price-card.featured { border: 3px solid var(--blue); padding: 22px; position: relative; }
    .price-card.featured:before { content: "推荐参考"; position: absolute; top: -14px; right: 18px; padding: 4px 10px; background: var(--yellow); font-size: 12px; font-weight: 800; }
    .price-card h3 { margin-bottom: 5px; }
    .price-card strong { display: block; color: var(--blue); font-size: 30px; margin-bottom: 10px; }
    .price-card p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .faq-list { display: grid; gap: 10px; max-width: 900px; }
    details { border: 1px solid var(--line); background: #fff; }
    summary { cursor: pointer; padding: 17px 20px; font-weight: 700; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
    summary::-webkit-details-marker { display: none; }
    summary:after { content: "+"; color: var(--blue); font-size: 22px; line-height: 1; }
    details[open] summary:after { content: "−"; }
    details p { padding: 0 20px 17px; margin: 0; color: var(--muted); font-size: 14px; }
    .article-grid { display: grid; grid-template-columns: repeat(5,1fr); gap: 12px; }
    .article-link { padding: 17px; background: #fff; border-left: 4px solid var(--coral); border-top: 1px solid var(--line); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); font-weight: 700; font-size: 14px; }
    .article-link:hover { color: var(--blue); }
    .contact { background: #edf2ff; }
    .contact-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 45px; align-items: start; }
    .contact-info { padding: 26px; background: var(--ink); color: #fff; }
    .contact-info h2 { font-size: 32px; line-height: 1.2; }
    .contact-info p { color: #d7e0ee; }
    .contact-info dl { margin: 25px 0 0; }
    .contact-info dt { color: var(--yellow); font-size: 13px; margin-top: 14px; }
    .contact-info dd { margin: 2px 0 0; }
    .form-panel { background: #fff; padding: 28px; border: 1px solid var(--line); }
    .form-grid { display: grid; grid-template-columns: repeat(2,1fr); gap: 16px; }
    .field { display: grid; gap: 6px; }
    .field.full { grid-column: 1/-1; }
    label { font-size: 13px; font-weight: 700; }
    input, select, textarea { width: 100%; border: 1px solid #ccd5e1; border-radius: 6px; padding: 12px 13px; color: var(--ink); background: #fff; outline: none; }
    input:focus, select:focus, textarea:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(49,85,237,.1); }
    textarea { min-height: 130px; resize: vertical; }
    .footer { background: #172238; color: #fff; padding: 46px 0 24px; }
    .footer-grid { display: grid; grid-template-columns: 1.2fr .8fr .8fr; gap: 35px; }
    .footer h2, .footer h3 { margin-bottom: 12px; }
    .footer p, .footer a { color: #cbd5e5; font-size: 14px; }
    .footer-links { display: grid; gap: 7px; }
    .footer-bottom { border-top: 1px solid #354258; margin-top: 30px; padding-top: 18px; color: #aab8ca; font-size: 12px; }
    .float-tools { position: fixed; right: 18px; bottom: 20px; z-index: 15; display: grid; gap: 8px; }
    .float-tools a { width: 48px; height: 48px; display: grid; place-items: center; border-radius: 50%; background: var(--coral); color: #fff; font-size: 12px; font-weight: 800; box-shadow: 0 7px 18px rgba(255,113,91,.28); }
    .float-tools a:last-child { background: var(--blue); }
    .reveal { opacity: 0; transform: translateY(18px); transition: opacity .65s ease, transform .65s ease; }
    .reveal.visible { opacity: 1; transform: none; }
    @media (max-width: 1050px) {
      .nav-links a { padding-left: 6px; padding-right: 6px; }
      .service-grid { grid-template-columns: repeat(2,1fr); }
      .network-list { grid-template-columns: repeat(2,1fr); }
      .article-grid { grid-template-columns: repeat(3,1fr); }
    }
    @media (max-width: 760px) {
      .container { width: min(var(--container), calc(100% - 28px)); }
      .nav-wrap { min-height: 68px; }
      .menu-toggle { display: block; }
      .nav-links { display: none; position: absolute; top: 68px; left: 14px; right: 14px; padding: 12px; background: #fffdf8; border: 1px solid var(--line); box-shadow: var(--shadow); align-items: stretch; }
      .nav-links.open { display: grid; grid-template-columns: repeat(2,1fr); }
      .nav-links a { padding: 10px; }
      .nav-action { grid-column: 1/-1; margin-top: 5px; }
      .hero { padding: 65px 0 45px; }
      .hero-grid, .about-grid, .highlight-layout, .contact-grid { grid-template-columns: 1fr; gap: 28px; }
      .hero-panel { transform: none; }
      .trust-bar { grid-template-columns: repeat(2,1fr); margin-top: 38px; }
      section { padding: 62px 0; }
      .step-grid { grid-template-columns: repeat(2,1fr); }
      .step:last-child { grid-column: 1/-1; }
      .case-grid, .review-grid, .pricing { grid-template-columns: 1fr; }
      .article-grid { grid-template-columns: repeat(2,1fr); }
      .footer-grid { grid-template-columns: 1fr; gap: 20px; }
    }
    @media (max-width: 470px) {
      h1 { font-size: 39px; }
      .hero-copy { font-size: 16px; }
      .service-grid, .network-list, .step-grid, .form-grid { grid-template-columns: 1fr; }
      .step:last-child, .field.full { grid-column: auto; }
      .article-grid { grid-template-columns: 1fr; }
      .trust-item strong { font-size: 23px; }
      .float-tools { right: 12px; }
    }