:root {
      color-scheme: light;
      --ink: #17232d;
      --muted: #596872;
      --paper: #f8f9fc;
      --white: #fff;
      --line: #dfe5e9;
      --teal: #087e78;
      --teal-dark: #075d5b;
      --coral: #ef5c4b;
      --yellow: #f2c94c;
      --blue: #2878b9;
      --max: 1160px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      font: 16px/1.65 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    }
    a { color: inherit; text-decoration: none; }
    button, input, select, textarea { font: inherit; }
    img { max-width: 100%; height: auto; }
    .container { width: min(var(--max), calc(100% - 40px)); margin-inline: auto; }
    .site-header { position: sticky; top: 0; z-index: 20; background: rgba(255,255,255,.96); border-bottom: 1px solid var(--line); backdrop-filter: blur(12px); }
    .nav-row { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
    .brand { display: inline-flex; align-items: center; gap: 10px; flex: 0 0 auto; }
    .ai-page-logo { width: 38px; max-width: 100%; height: auto; }
    .brand-name { font-weight: 800; letter-spacing: 0; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; gap: 0; flex-wrap: wrap; }
    .nav-links a { padding: 10px 11px; color: #394850; font-size: 14px; }
    .nav-links a:hover { color: var(--teal); }
    .nav-cta, .button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 10px 18px; border: 0; border-radius: 5px; background: var(--teal); color: #fff; font-weight: 750; cursor: pointer; transition: transform .18s ease, background .18s ease, box-shadow .18s ease; }
    .nav-cta:hover, .button:hover { background: var(--teal-dark); box-shadow: 0 8px 20px rgba(7,93,91,.2); transform: translateY(-2px); }
    .button.coral { background: var(--coral); }
    .button.coral:hover { background: #d9493b; }
    .menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 5px; background: #fff; color: var(--ink); cursor: pointer; }
    .hero { position: relative; overflow: hidden; background: #e9f7f4; border-bottom: 1px solid #d6eae6; }
    .hero::before { content: ""; position: absolute; width: 330px; height: 330px; right: 8%; top: -165px; border: 54px solid rgba(8,126,120,.11); border-radius: 50%; animation: drift 10s ease-in-out infinite alternate; }
    .hero::after { content: ""; position: absolute; width: 100px; height: 100px; right: 20%; bottom: 36px; background: var(--yellow); transform: rotate(18deg); opacity: .72; }
    .hero-inner { position: relative; z-index: 1; padding-block: 86px 64px; }
    .hero-copy { max-width: 720px; }
    .eyebrow { display: inline-flex; align-items: center; gap: 9px; color: var(--teal-dark); font-size: 13px; font-weight: 800; letter-spacing: 1px; text-transform: uppercase; }
    .eyebrow::before { content: ""; width: 24px; height: 3px; background: var(--coral); }
    h1 { max-width: 680px; margin: 18px 0 14px; font-size: clamp(38px, 6vw, 68px); line-height: 1.08; letter-spacing: 0; }
    .hero-copy p { max-width: 630px; margin: 0; color: #43565e; font-size: 18px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
    .button.secondary { background: #fff; color: var(--teal-dark); border: 1px solid #a9cfca; }
    .button.secondary:hover { background: #f5fffd; }
    .hero-proof { display: flex; flex-wrap: wrap; gap: 22px; margin-top: 32px; color: #43565e; font-size: 14px; }
    .hero-proof span::before { content: "✓"; color: var(--teal); margin-right: 7px; font-weight: 900; }
    .metric-band { position: relative; z-index: 2; display: grid; grid-template-columns: repeat(4,1fr); margin-top: 34px; background: #fff; border: 1px solid #dce7e5; }
    .metric { padding: 19px 22px; border-right: 1px solid var(--line); }
    .metric:last-child { border-right: 0; }
    .metric strong { display: block; color: var(--teal-dark); font-size: 20px; }
    .metric span { color: var(--muted); font-size: 13px; }
    main { overflow: hidden; }
    section.content-section { padding: 76px 0; }
    section.tinted { background: #eef3f6; }
    .section-head { max-width: 720px; margin-bottom: 30px; }
    .section-head h2 { margin: 8px 0 10px; font-size: clamp(28px, 4vw, 40px); line-height: 1.2; }
    .section-head p { margin: 0; color: var(--muted); }
    .kicker { color: var(--coral); font-size: 13px; font-weight: 800; letter-spacing: 1px; }
    .intro-layout { display: grid; grid-template-columns: 1.2fr .8fr; gap: 50px; align-items: start; }
    .intro-copy p { color: #43525a; }
    .capability-list { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 0 24px; margin: 22px 0 0; padding: 0; list-style: none; }
    .capability-list li { padding: 12px 0; border-bottom: 1px solid var(--line); }
    .capability-list strong { display: block; font-size: 15px; }
    .capability-list span { color: var(--muted); font-size: 13px; }
    .model-panel { padding: 24px; background: #172b34; color: #fff; border-radius: 5px; }
    .model-panel h3 { margin: 0 0 8px; font-size: 21px; }
    .model-panel p { margin: 0 0 18px; color: #d1e0e2; font-size: 14px; }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
    .tag-cloud span { padding: 5px 9px; border: 1px solid #51656b; border-radius: 3px; color: #edf4f3; font-size: 12px; }
    .service-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 14px; }
    .service-item { min-height: 160px; padding: 21px; background: #fff; border-top: 3px solid var(--teal); box-shadow: 0 4px 14px rgba(26,52,61,.05); transition: transform .2s ease, box-shadow .2s ease; }
    .service-item:nth-child(3n+2) { border-top-color: var(--coral); }
    .service-item:nth-child(3n) { border-top-color: var(--yellow); }
    .service-item:hover { transform: translateY(-4px); box-shadow: 0 12px 24px rgba(26,52,61,.1); }
    .service-item h3 { margin: 0 0 8px; font-size: 18px; }
    .service-item p { margin: 0; color: var(--muted); font-size: 14px; }
    .service-item .service-type { display: block; margin-top: 14px; color: var(--teal-dark); font-size: 12px; font-weight: 750; }
    .workflow { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 20px; counter-reset: step; }
    .workflow article { position: relative; padding: 22px 18px 18px; border-left: 2px solid var(--teal); background: #fff; }
    .workflow article::before { counter-increment: step; content: "0" counter(step); display: block; margin-bottom: 14px; color: var(--coral); font-size: 24px; font-weight: 850; }
    .workflow h3 { margin: 0 0 6px; font-size: 17px; }
    .workflow p { margin: 0; color: var(--muted); font-size: 14px; }
    .case-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 18px; align-items: stretch; }
    .case-feature { overflow: hidden; background: #fff; }
    .case-feature img { display: block; width: 100%; aspect-ratio: 16/8; object-fit: cover; }
    .case-caption { padding: 20px 22px; }
    .case-caption h3 { margin: 0 0 6px; }
    .case-caption p { margin: 0; color: var(--muted); font-size: 14px; }
    .case-stack { display: grid; gap: 18px; }
    .case-small { display: grid; grid-template-columns: 130px 1fr; gap: 16px; align-items: center; padding: 14px; background: #fff; }
    .case-small img { width: 130px; aspect-ratio: 1; object-fit: cover; }
    .case-small h3 { margin: 0 0 5px; font-size: 16px; }
    .case-small p { margin: 0; color: var(--muted); font-size: 13px; }
    .review-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 14px; }
    .review { padding: 20px; background: #fff; border: 1px solid var(--line); }
    .review blockquote { margin: 0 0 18px; color: #33434a; font-size: 14px; }
    .review footer { display: flex; justify-content: space-between; gap: 10px; color: var(--muted); font-size: 12px; }
    .stars { color: #b97800; letter-spacing: 0; }
    .score-layout { display: grid; grid-template-columns: .75fr 1.25fr; gap: 28px; align-items: start; }
    .score-box { padding: 25px; background: #17353b; color: #fff; }
    .score-box .score { display: block; color: var(--yellow); font-size: 54px; font-weight: 850; line-height: 1.1; }
    .score-box p { color: #d8e7e6; }
    .score-box .stars { font-size: 22px; }
    .table-wrap { overflow-x: auto; background: #fff; border: 1px solid var(--line); }
    table { width: 100%; min-width: 560px; border-collapse: collapse; text-align: left; }
    th, td { padding: 13px 15px; border-bottom: 1px solid var(--line); }
    th { background: #e7f2f0; font-size: 13px; }
    td { color: #43525a; font-size: 14px; }
    td:first-child { color: var(--ink); font-weight: 700; }
    .score-note { margin: 12px 0 0; color: var(--muted); font-size: 12px; }
    .network-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 34px; align-items: start; }
    .network-list { display: grid; gap: 0; }
    .network-row { display: flex; justify-content: space-between; gap: 20px; padding: 15px 0; border-bottom: 1px solid var(--line); }
    .network-row strong { font-size: 15px; }
    .network-row span { color: var(--muted); text-align: right; font-size: 14px; }
    .comparison-note { padding: 22px; background: #fff; border-left: 4px solid var(--coral); }
    .comparison-note h3 { margin: 0 0 8px; }
    .comparison-note p { margin: 0; color: var(--muted); font-size: 14px; }
    .article-links { display: grid; grid-template-columns: repeat(5,minmax(0,1fr)); gap: 10px; }
    .article-links a { display: flex; align-items: center; min-height: 84px; padding: 15px; background: #fff; border: 1px solid var(--line); font-weight: 700; font-size: 14px; transition: border-color .18s ease, color .18s ease; }
    .article-links a:hover { color: var(--teal-dark); border-color: var(--teal); }
    .faq-list { border-top: 1px solid var(--line); }
    .faq-list details { border-bottom: 1px solid var(--line); }
    .faq-list summary { position: relative; padding: 17px 40px 17px 0; cursor: pointer; font-weight: 750; list-style: none; }
    .faq-list summary::-webkit-details-marker { display: none; }
    .faq-list summary::after { content: "+"; position: absolute; right: 5px; top: 12px; color: var(--teal); font-size: 24px; }
    .faq-list details[open] summary::after { content: "−"; }
    .faq-list details p { max-width: 800px; margin: 0 0 18px; color: var(--muted); }
    .contact-grid { display: grid; grid-template-columns: 1fr .8fr; gap: 36px; align-items: start; }
    .lead-form { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 14px; }
    .field { display: grid; gap: 6px; }
    .field.full { grid-column: 1 / -1; }
    .field label { font-size: 13px; font-weight: 750; }
    .field input, .field select, .field textarea { width: 100%; min-height: 44px; padding: 10px 12px; border: 1px solid #cbd5da; border-radius: 3px; background: #fff; color: var(--ink); }
    .field textarea { min-height: 110px; resize: vertical; }
    .contact-aside { padding: 22px; background: #e7f2f0; }
    .contact-aside h3 { margin: 0 0 12px; }
    .contact-aside p { margin: 7px 0; color: #43525a; font-size: 14px; }
    .contact-aside img { display: block; width: 150px; margin-top: 18px; border: 5px solid #fff; }
    .join-band { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding: 25px 28px; background: #fcedc9; }
    .join-band h2 { margin: 0 0 4px; font-size: 23px; }
    .join-band p { margin: 0; color: #555248; font-size: 14px; }
    .site-footer { padding: 30px 0; background: #172b34; color: #f4f7f7; }
    .footer-row { display: flex; justify-content: space-between; align-items: flex-start; gap: 30px; }
    .site-footer p { margin: 4px 0; color: #d1dddf; font-size: 13px; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 8px 16px; max-width: 650px; }
    .footer-links a { color: #f4d575; font-size: 13px; }
    .float-contact { position: fixed; z-index: 15; right: 18px; bottom: 20px; display: grid; gap: 8px; }
    .float-contact a { display: grid; place-items: center; width: 48px; height: 48px; border-radius: 50%; background: var(--teal-dark); color: #fff; font-size: 12px; font-weight: 800; box-shadow: 0 5px 16px rgba(0,0,0,.17); }
    .float-contact a:last-child { background: var(--coral); }
    .reveal { opacity: 0; transform: translateY(14px); transition: opacity .55s ease, transform .55s ease; }
    .reveal.visible { opacity: 1; transform: translateY(0); }
    @keyframes drift { from { transform: translateY(0) rotate(0); } to { transform: translateY(24px) rotate(18deg); } }
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
      .reveal { opacity: 1; transform: none; }
    }
    @media (max-width: 920px) {
      .menu-toggle { display: inline-grid; place-items: center; }
      .nav-row { flex-wrap: wrap; padding-block: 12px; }
      .nav-links { display: none; width: 100%; justify-content: flex-start; padding: 4px 0 8px; }
      .nav-links.open { display: flex; }
      .nav-links a { padding: 8px 10px; }
      .nav-cta { display: none; }
      .service-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
      .article-links { grid-template-columns: repeat(3,minmax(0,1fr)); }
      .review-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
    }
    @media (max-width: 680px) {
      .container { width: min(var(--max), calc(100% - 30px)); }
      .hero-inner { padding-block: 62px 36px; }
      .hero::before { right: -190px; }
      .hero::after { right: 10%; width: 54px; height: 54px; bottom: 35px; }
      .hero-copy p { font-size: 16px; }
      .metric-band { grid-template-columns: repeat(2,1fr); margin-top: 26px; }
      .metric { padding: 15px; border-bottom: 1px solid var(--line); }
      .metric:nth-child(2) { border-right: 0; }
      .metric:nth-child(3), .metric:nth-child(4) { border-bottom: 0; }
      section.content-section { padding: 56px 0; }
      .intro-layout, .score-layout, .network-grid, .contact-grid, .case-grid { grid-template-columns: 1fr; gap: 24px; }
      .capability-list { grid-template-columns: 1fr; }
      .service-grid, .workflow, .review-grid { grid-template-columns: 1fr; }
      .workflow { gap: 10px; }
      .case-small { grid-template-columns: 96px 1fr; }
      .case-small img { width: 96px; }
      .article-links { grid-template-columns: repeat(2,minmax(0,1fr)); }
      .lead-form { grid-template-columns: 1fr; }
      .field.full { grid-column: auto; }
      .join-band, .footer-row { align-items: flex-start; flex-direction: column; }
      .float-contact { right: 12px; bottom: 12px; }
      .float-contact a { width: 44px; height: 44px; }
    }