:root {
      color-scheme: light;
      --ink: #20251f;
      --muted: #62675e;
      --paper: #fffdf5;
      --surface: #ffffff;
      --line: #e7e6dc;
      --yellow: #f4d928;
      --yellow-deep: #e4c400;
      --green: #245a43;
      --green-soft: #e9f1e7;
      --coral: #e16b4b;
      --container: 1180px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      background: var(--paper);
      color: var(--ink);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      line-height: 1.65;
    }
    a { color: inherit; text-decoration: none; }
    button, input, select, textarea { font: inherit; }
    img { max-width: 100%; height: auto; }
    .container { width: min(var(--container), calc(100% - 40px)); margin-inline: auto; }
    .site-header { position: sticky; top: 0; z-index: 20; background: rgba(255,253,245,.96); border-bottom: 1px solid var(--line); backdrop-filter: blur(12px); }
    .header-inner { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
    .brand { display: inline-flex; align-items: center; gap: 10px; flex: 0 0 auto; font-weight: 800; font-size: 20px; }
    .ai-page-logo { display: block; width: 38px; height: 38px; object-fit: contain; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; flex-wrap: wrap; gap: 0; }
    .nav-links a { padding: 10px 8px; font-size: 13px; color: #41463e; transition: color .2s; }
    .nav-links a:hover { color: var(--green); }
    .nav-cta, .button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 0 20px; border: 1px solid var(--ink); background: var(--ink); color: white; font-weight: 700; transition: transform .2s, background .2s, box-shadow .2s; }
    .nav-cta:hover, .button:hover { transform: translateY(-2px); background: var(--green); box-shadow: 0 8px 18px rgba(32,37,31,.15); }
    .menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); background: white; color: var(--ink); cursor: pointer; }
    .hero { position: relative; overflow: hidden; padding: 80px 0 56px; background: var(--yellow); }
    .hero::after { content: ""; position: absolute; right: -90px; top: -150px; width: 390px; height: 390px; border: 1px solid rgba(32,37,31,.18); border-radius: 50%; box-shadow: 0 0 0 36px rgba(255,255,255,.09), 0 0 0 72px rgba(255,255,255,.07); pointer-events: none; }
    .hero-inner { position: relative; z-index: 1; max-width: 900px; }
    .eyebrow { display: inline-flex; align-items: center; gap: 9px; margin: 0 0 20px; font-size: 13px; font-weight: 800; letter-spacing: 0; text-transform: uppercase; }
    .eyebrow::before { content: ""; width: 28px; height: 2px; background: var(--ink); }
    h1 { max-width: 850px; margin: 0; font-size: clamp(42px, 7vw, 78px); line-height: 1.06; letter-spacing: 0; }
    .hero-copy { max-width: 680px; margin: 22px 0 28px; font-size: 18px; color: #3a3b30; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
    .button-primary { background: var(--ink); border-color: var(--ink); color: white; }
    .button-secondary { background: transparent; border-color: rgba(32,37,31,.45); color: var(--ink); }
    .button-secondary:hover { background: rgba(255,255,255,.55); color: var(--ink); }
    .hero-proof { display: flex; flex-wrap: wrap; gap: 10px 24px; margin-top: 34px; color: #3c4034; font-size: 13px; }
    .hero-proof span::before { content: "✓"; margin-right: 8px; font-weight: 900; }
    .metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; padding: 26px 0; border-bottom: 1px solid var(--line); }
    .metric { padding: 4px 24px; border-right: 1px solid var(--line); }
    .metric:first-child { padding-left: 0; }
    .metric:last-child { border: 0; }
    .metric strong { display: block; font-size: 23px; line-height: 1.3; }
    .metric span { color: var(--muted); font-size: 13px; }
    section.content-section { padding: 76px 0; border-bottom: 1px solid var(--line); }
    .section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 30px; }
    .section-head > div { max-width: 720px; }
    .section-kicker { margin: 0 0 8px; color: var(--green); font-size: 12px; font-weight: 800; }
    h2 { margin: 0; font-size: clamp(28px, 4vw, 42px); line-height: 1.2; letter-spacing: 0; }
    .section-intro { max-width: 700px; margin: 12px 0 0; color: var(--muted); }
    h3 { margin: 0 0 10px; font-size: 19px; line-height: 1.35; }
    .platform-layout { display: grid; grid-template-columns: 1.2fr .8fr; gap: 42px; align-items: start; }
    .platform-copy { max-width: 720px; color: var(--muted); }
    .platform-copy p:first-child { margin-top: 0; }
    .feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 24px; margin: 24px 0 0; padding: 0; list-style: none; }
    .feature-list li { padding: 12px 0; border-top: 1px solid var(--line); font-weight: 700; }
    .feature-list li span { display: block; margin-top: 3px; color: var(--muted); font-size: 13px; font-weight: 400; }
    .model-panel { padding: 24px; background: var(--green-soft); border-left: 4px solid var(--green); }
    .model-panel p { margin: 0; color: #405047; font-size: 14px; }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
    .tag { padding: 6px 10px; border: 1px solid #c9d7c9; background: #f7fbf5; color: #244a37; font-size: 12px; }
    .service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0 22px; }
    .service-item { padding: 22px 0; border-top: 1px solid var(--line); }
    .service-item p { margin: 0; color: var(--muted); font-size: 14px; }
    .service-item .service-type { display: block; margin-bottom: 8px; color: var(--coral); font-size: 11px; font-weight: 800; }
    .split-band { background: #f1f4ed; }
    .workflow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; counter-reset: step; }
    .step { position: relative; padding-top: 18px; border-top: 2px solid var(--green); counter-increment: step; }
    .step::before { content: "0" counter(step); display: block; margin-bottom: 15px; color: var(--green); font-size: 13px; font-weight: 900; }
    .step p { margin: 0; color: var(--muted); font-size: 14px; }
    .industry-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
    .industry { padding: 17px 16px; background: white; border: 1px solid var(--line); font-size: 14px; font-weight: 700; }
    .industry span { display: block; margin-top: 5px; color: var(--muted); font-size: 12px; font-weight: 400; }
    .service-network { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: center; }
    .network-note { padding: 22px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); color: var(--muted); }
    .visual-pair { display: grid; grid-template-columns: 1.35fr .8fr; gap: 14px; align-items: start; }
    .visual-pair figure { margin: 0; }
    .visual-pair img { display: block; width: 100%; height: auto; }
    .visual-pair figcaption { margin-top: 8px; color: var(--muted); font-size: 12px; }
    .review-score { display: flex; align-items: center; gap: 22px; padding: 22px 0; border-bottom: 1px solid var(--line); }
    .score-number { font-size: 50px; line-height: 1; font-weight: 900; }
    .stars { color: #ad8b00; font-size: 20px; letter-spacing: 0; }
    .review-score p { margin: 5px 0 0; color: var(--muted); font-size: 14px; }
    .table-wrap { overflow-x: auto; border: 1px solid var(--line); background: white; }
    table { width: 100%; border-collapse: collapse; min-width: 680px; text-align: left; }
    th, td { padding: 14px 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
    th { background: #f2f2e8; font-size: 13px; }
    td { color: #4e534b; font-size: 14px; }
    td:first-child { color: var(--ink); font-weight: 700; }
    .highlight-cell { color: var(--green); font-weight: 800; }
    .case-grid, .review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
    .case { border-top: 3px solid var(--yellow-deep); padding: 18px 0; }
    .case p, .review p { margin: 0; color: var(--muted); font-size: 14px; }
    .case small { display: block; margin-top: 12px; color: var(--green); font-weight: 700; }
    .review { padding: 20px; background: white; border: 1px solid var(--line); }
    .review p { color: #454a43; }
    .review footer { margin-top: 16px; color: var(--muted); font-size: 12px; }
    .review footer strong { color: var(--ink); font-size: 13px; }
    .price-line { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 20px; padding: 18px 0; border-top: 1px solid var(--line); }
    .price-line p { margin: 4px 0 0; color: var(--muted); font-size: 14px; }
    .price-label { color: var(--green); font-size: 13px; font-weight: 800; }
    .faq-list { border-top: 1px solid var(--line); }
    .faq-list details { border-bottom: 1px solid var(--line); }
    .faq-list summary { position: relative; padding: 18px 34px 18px 0; cursor: pointer; list-style: none; font-weight: 700; }
    .faq-list summary::-webkit-details-marker { display: none; }
    .faq-list summary::after { content: "+"; position: absolute; right: 4px; top: 14px; font-size: 22px; font-weight: 400; }
    .faq-list details[open] summary::after { content: "−"; }
    .faq-list details p { max-width: 820px; margin: 0 0 18px; color: var(--muted); font-size: 14px; }
    .article-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 26px; }
    .article-list a { display: flex; justify-content: space-between; gap: 20px; padding: 15px 0; border-top: 1px solid var(--line); font-weight: 700; }
    .article-list a span { color: var(--green); font-size: 12px; white-space: nowrap; }
    .form-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 50px; align-items: start; }
    .contact-copy p { color: var(--muted); }
    .contact-details { margin-top: 22px; padding-top: 16px; border-top: 1px solid var(--line); }
    .contact-details p { margin: 7px 0; font-size: 14px; }
    .contact-form { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
    .field { display: grid; gap: 6px; }
    .field-full { grid-column: 1 / -1; }
    .field label { font-size: 13px; font-weight: 700; }
    .field input, .field select, .field textarea { width: 100%; min-height: 46px; padding: 11px 12px; color: var(--ink); background: white; border: 1px solid #cfd1c8; border-radius: 0; }
    .field textarea { min-height: 120px; resize: vertical; }
    .contact-form button { justify-self: start; cursor: pointer; }
    .join-strip { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding: 26px 0; border-top: 1px solid var(--line); }
    .join-strip p { margin: 5px 0 0; color: var(--muted); }
    .site-footer { padding: 28px 0; background: #e9ecdf; color: #273129; }
    .footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 20px; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 8px 18px; font-size: 13px; }
    .footer-links a { color: #315642; }
    .copyright { color: #4f574e; font-size: 12px; }
    .floating-help { position: fixed; right: 18px; bottom: 18px; z-index: 15; }
    .floating-help summary { display: grid; place-items: center; width: 52px; height: 52px; background: var(--green); color: white; cursor: pointer; list-style: none; font-size: 13px; font-weight: 800; box-shadow: 0 5px 18px rgba(0,0,0,.18); }
    .floating-help summary::-webkit-details-marker { display: none; }
    .help-popover { position: absolute; right: 0; bottom: 64px; width: min(280px, calc(100vw - 40px)); padding: 18px; background: white; border: 1px solid var(--line); box-shadow: 0 8px 28px rgba(0,0,0,.12); }
    .help-popover img { display: block; width: 150px; margin: 12px auto; }
    .help-popover p { margin: 5px 0; font-size: 13px; }
    .reveal { opacity: 0; transform: translateY(14px); transition: opacity .55s ease, transform .55s ease; }
    .reveal.is-visible { opacity: 1; transform: translateY(0); }
    @media (max-width: 980px) {
      .menu-toggle { display: inline-grid; place-items: center; }
      .header-inner { flex-wrap: wrap; }
      .nav-links { display: none; flex: 1 0 100%; justify-content: flex-start; padding: 4px 0 14px; }
      .nav-links.is-open { display: flex; }
      .nav-links a { padding: 8px 12px 8px 0; }
      .nav-cta { margin-left: auto; }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .industry-grid { grid-template-columns: repeat(3, 1fr); }
      .case-grid, .review-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 680px) {
      .container { width: min(var(--container), calc(100% - 32px)); }
      .header-inner { min-height: 66px; gap: 10px; }
      .brand { font-size: 17px; }
      .ai-page-logo { width: 32px; height: 32px; }
      .nav-cta { min-height: 40px; padding: 0 12px; font-size: 13px; }
      .hero { padding: 64px 0 40px; }
      .hero-copy { font-size: 16px; }
      .metrics { grid-template-columns: repeat(2, 1fr); gap: 18px 0; }
      .metric { padding: 0 12px; }
      .metric:nth-child(2) { border: 0; }
      .metric:first-child { padding-left: 0; }
      section.content-section { padding: 54px 0; }
      .section-head { display: block; }
      .platform-layout, .service-network, .form-layout { grid-template-columns: 1fr; gap: 24px; }
      .feature-list { grid-template-columns: 1fr; }
      .service-grid { grid-template-columns: 1fr; }
      .workflow { grid-template-columns: repeat(2, 1fr); gap: 24px 16px; }
      .industry-grid { grid-template-columns: repeat(2, 1fr); }
      .case-grid, .review-grid { grid-template-columns: 1fr; }
      .article-list { grid-template-columns: 1fr; }
      .contact-form { grid-template-columns: 1fr; }
      .field-full { grid-column: auto; }
      .join-strip, .footer-inner { align-items: flex-start; flex-direction: column; }
      .review-score { align-items: flex-start; }
      .visual-pair { grid-template-columns: 1fr 1fr; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
      .reveal { opacity: 1; transform: none; }
    }