:root {
      color-scheme: light;
      --ink: #252b36;
      --muted: #626c7b;
      --paper: #fffdf8;
      --white: #ffffff;
      --line: #e9e7e1;
      --coral: #ff705e;
      --orange: #ffb34e;
      --yellow: #ffe16c;
      --mint: #85ddc1;
      --blue: #86c9fa;
      --violet: #b6a0f5;
      --shadow: 0 12px 32px rgba(48, 48, 63, .08);
      --container: 1160px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; scroll-padding-top: 86px; }
    body {
      margin: 0;
      background: var(--paper);
      color: var(--ink);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      line-height: 1.7;
    }
    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(255,253,248,.95);
      border-bottom: 1px solid rgba(37,43,54,.08);
      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: 11px; flex-shrink: 0; font-weight: 800; }
    .ai-page-logo { display: block; width: 42px; max-height: 42px; object-fit: contain; }
    .brand-name { font-size: 17px; letter-spacing: 0; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; gap: 0; }
    .nav-links a { color: #4d5663; padding: 9px 11px; font-size: 13px; white-space: nowrap; border-radius: 7px; transition: background .2s, color .2s; }
    .nav-links a:hover { background: #fff0d5; color: #b85036; }
    .nav-links .nav-cta { background: var(--ink); color: white; margin-left: 8px; padding-inline: 16px; }
    .nav-toggle { display: none; border: 1px solid var(--line); background: white; color: var(--ink); width: 42px; height: 42px; border-radius: 8px; cursor: pointer; }
    .hero { position: relative; overflow: hidden; padding: 76px 0 48px; background: #fff3cf; }
    .hero::before, .hero::after { content: ""; position: absolute; pointer-events: none; border-radius: 50%; }
    .hero::before { width: 260px; height: 260px; border: 36px solid rgba(255,112,94,.15); right: -60px; top: -95px; }
    .hero::after { width: 140px; height: 140px; background: rgba(133,221,193,.35); right: 17%; bottom: -95px; }
    .hero-inner { position: relative; z-index: 1; }
    .hero-copy { max-width: 820px; }
    .eyebrow { display: inline-flex; align-items: center; gap: 8px; color: #a34d3c; font-size: 13px; font-weight: 750; }
    .eyebrow::before { content: ""; width: 9px; height: 9px; border-radius: 3px; background: var(--coral); transform: rotate(45deg); }
    h1 { max-width: 760px; margin: 14px 0 18px; font-size: clamp(38px, 6vw, 68px); line-height: 1.1; letter-spacing: 0; }
    .hero-copy p { max-width: 680px; margin: 0; color: #525b67; font-size: 17px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
    .button { display: inline-flex; align-items: center; justify-content: center; gap: 9px; min-height: 48px; padding: 11px 20px; border-radius: 8px; border: 1px solid transparent; font-weight: 750; transition: transform .2s, box-shadow .2s, background .2s; }
    .button:hover { transform: translateY(-2px); box-shadow: 0 9px 22px rgba(37,43,54,.14); }
    .button-primary { color: #fff; background: var(--ink); }
    .button-secondary { background: white; border-color: #e4ded0; }
    .hero-tags { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 30px; }
    .hero-tags span { padding: 6px 11px; background: rgba(255,255,255,.68); border: 1px solid rgba(37,43,54,.08); border-radius: 6px; color: #4c5664; font-size: 12px; }
    .metric-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; margin-top: 46px; background: rgba(255,255,255,.75); border: 1px solid rgba(37,43,54,.08); border-radius: 10px; }
    .metric { padding: 18px 22px; }
    .metric + .metric { border-left: 1px solid var(--line); }
    .metric strong { display: block; font-size: 19px; }
    .metric span { color: var(--muted); font-size: 12px; }
    .section { padding: 76px 0; }
    .section-tint { background: #fff8e9; }
    .section-mint { background: #edf9f4; }
    .section-head { display: flex; align-items: end; justify-content: space-between; gap: 22px; margin-bottom: 30px; }
    .section-head > div { max-width: 720px; }
    .section-kicker { margin: 0 0 6px; color: #b4543f; text-transform: uppercase; font-size: 12px; font-weight: 800; letter-spacing: 0; }
    h2 { margin: 0; font-size: clamp(27px, 4vw, 38px); line-height: 1.2; letter-spacing: 0; }
    .section-intro { color: var(--muted); margin: 10px 0 0; }
    .text-link { color: #b24d39; font-weight: 750; white-space: nowrap; }
    .intro-layout { display: grid; grid-template-columns: 1.15fr .85fr; align-items: start; gap: 44px; }
    .intro-copy p { margin: 0 0 15px; color: #515b69; }
    .capability-list { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 18px; margin: 22px 0 0; padding: 0; list-style: none; }
    .capability-list li { padding-left: 20px; position: relative; color: #394451; }
    .capability-list li::before { content: ""; position: absolute; left: 0; top: .68em; width: 8px; height: 8px; border-radius: 2px; background: var(--mint); }
    .model-panel { padding: 24px; background: #fff; border: 1px solid var(--line); border-radius: 10px; }
    .model-panel h3 { margin: 0 0 13px; font-size: 17px; }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
    .tag-cloud span { border: 1px solid #e8e7e2; background: #fffdf8; padding: 5px 10px; border-radius: 6px; color: #4e5865; font-size: 12px; }
    .service-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
    .service-card { min-height: 170px; padding: 20px; border: 1px solid var(--line); border-radius: 8px; background: white; transition: transform .22s, box-shadow .22s; }
    .service-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
    .service-icon { display: grid; place-items: center; width: 38px; height: 38px; border-radius: 10px; color: #293240; font-weight: 850; margin-bottom: 14px; }
    .icon-coral { background: #ffe0d9; } .icon-yellow { background: #fff0b2; } .icon-mint { background: #d9f5e9; } .icon-blue { background: #d9eeff; }
    .service-card h3 { margin: 0 0 7px; font-size: 16px; }
    .service-card p { margin: 0; color: var(--muted); font-size: 13px; }
    .workflow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; counter-reset: step; }
    .workflow-item { padding-top: 18px; border-top: 2px solid #ffb34e; position: relative; }
    .workflow-item::before { counter-increment: step; content: "0" counter(step); display: block; color: #d5644d; font-size: 13px; font-weight: 850; margin-bottom: 12px; }
    .workflow-item h3 { margin: 0 0 7px; font-size: 17px; }
    .workflow-item p { margin: 0; color: var(--muted); font-size: 14px; }
    .solution-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px 36px; }
    .solution { padding: 19px 0; border-bottom: 1px solid #dfe8e2; }
    .solution h3 { margin: 0 0 6px; font-size: 17px; }
    .solution p { margin: 0; color: var(--muted); font-size: 14px; }
    .network-line { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
    .network-line span { background: #fff; border: 1px solid #e6e4de; border-radius: 7px; padding: 10px 14px; font-size: 13px; font-weight: 700; }
    .network-line b { color: #b4543f; font-size: 18px; }
    .case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .case-card { overflow: hidden; background: white; border: 1px solid var(--line); border-radius: 8px; }
    .case-card .media { aspect-ratio: 16 / 9; overflow: hidden; background: #f6f3ed; }
    .case-card .media img { width: 100%; height: 100%; object-fit: cover; display: block; }
    .case-copy { padding: 17px 18px 20px; }
    .case-copy h3 { margin: 0 0 6px; font-size: 17px; }
    .case-copy p { margin: 0; color: var(--muted); font-size: 13px; }
    .review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
    .review { padding: 20px; background: white; border: 1px solid var(--line); border-radius: 8px; }
    .review blockquote { margin: 0; color: #414b58; font-size: 14px; }
    .review figcaption { margin-top: 14px; color: var(--muted); font-size: 12px; font-weight: 700; }
    .rating-layout { display: grid; grid-template-columns: .7fr 1.3fr; gap: 28px; align-items: start; }
    .rating-card { padding: 24px; background: #fff1c5; border-radius: 8px; }
    .rating-card .score { font-size: 54px; line-height: 1; font-weight: 850; }
    .rating-card .stars { color: #c46637; font-size: 20px; letter-spacing: 0; margin: 10px 0; }
    .rating-card p { margin: 8px 0 0; color: #5b5143; font-size: 13px; }
    .table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 8px; background: white; }
    table { width: 100%; border-collapse: collapse; min-width: 620px; text-align: left; }
    th, td { padding: 13px 15px; border-bottom: 1px solid #eeece6; font-size: 13px; }
    th { background: #f7f6f1; color: #404956; }
    td:first-child { font-weight: 700; }
    .positive { color: #277d60; font-weight: 750; }
    .request-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 46px; align-items: start; }
    .request-copy p { color: var(--muted); }
    .request-copy ul { padding-left: 18px; color: #46515e; }
    .request-form { display: grid; grid-template-columns: 1fr 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%; border: 1px solid #dcdedc; border-radius: 6px; padding: 11px 12px; background: #fff; color: var(--ink); outline: none; }
    .field input:focus, .field select:focus, .field textarea:focus { border-color: #4da987; box-shadow: 0 0 0 3px rgba(77,169,135,.12); }
    .field textarea { min-height: 120px; resize: vertical; }
    .form-note { margin: 0; color: var(--muted); font-size: 12px; }
    .faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 18px; }
    details { background: white; border: 1px solid var(--line); border-radius: 7px; padding: 14px 16px; }
    summary { cursor: pointer; font-weight: 750; font-size: 14px; }
    details p { margin: 10px 0 0; color: var(--muted); font-size: 13px; }
    .article-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; }
    .article-link { display: block; padding: 15px; background: white; border: 1px solid var(--line); border-radius: 7px; font-size: 13px; font-weight: 700; transition: border-color .2s, transform .2s; }
    .article-link:hover { transform: translateY(-2px); border-color: var(--coral); }
    .contact-row { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: start; }
    .contact-details { display: grid; gap: 12px; color: #46515e; }
    .contact-details a { color: #a84d3c; font-weight: 700; }
    .qr-wrap { display: flex; align-items: center; gap: 18px; padding: 16px; background: white; border: 1px solid var(--line); border-radius: 8px; }
    .qr-wrap img { width: 112px; aspect-ratio: 1; object-fit: contain; }
    .qr-wrap p { margin: 0; font-size: 13px; color: var(--muted); }
    .join-band { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding: 28px 30px; background: #ffe0d7; border-radius: 9px; }
    .join-band h2 { font-size: 25px; }
    .join-band p { color: #66524d; margin: 7px 0 0; }
    .site-footer { background: #f1efe8; color: #39424d; padding: 30px 0 24px; border-top: 1px solid #e5e2d9; }
    .footer-top { display: flex; justify-content: space-between; gap: 28px; align-items: start; }
    .footer-brand { font-weight: 850; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 8px 17px; font-size: 12px; }
    .footer-links a { color: #4d5965; }
    .footer-bottom { margin-top: 20px; padding-top: 14px; border-top: 1px solid #ddd9cf; color: #66707c; font-size: 12px; }
    .floating-help { position: fixed; right: 18px; bottom: 18px; z-index: 15; display: grid; gap: 8px; }
    .floating-help a { display: grid; place-items: center; min-width: 48px; min-height: 46px; padding: 0 12px; border-radius: 7px; color: white; background: #293240; box-shadow: 0 5px 16px rgba(37,43,54,.18); font-size: 12px; font-weight: 750; }
    .to-top { display: none !important; }
    .to-top.visible { display: grid !important; }
    .reveal { opacity: 0; transform: translateY(14px); transition: opacity .55s ease, transform .55s ease; }
    .reveal.is-visible { opacity: 1; transform: none; }
    @media (max-width: 960px) {
      .nav-toggle { display: inline-grid; place-items: center; }
      .nav-links { display: none; position: absolute; left: 20px; right: 20px; top: 66px; padding: 12px; background: white; border: 1px solid var(--line); border-radius: 8px; box-shadow: var(--shadow); align-items: stretch; }
      .nav-links.open { display: grid; grid-template-columns: 1fr 1fr; }
      .nav-links a { padding: 10px; }
      .nav-links .nav-cta { margin: 4px 0 0; text-align: center; grid-column: 1 / -1; }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .article-grid { grid-template-columns: repeat(3, 1fr); }
    }
    @media (max-width: 680px) {
      .container { width: min(var(--container), calc(100% - 30px)); }
      .hero { padding: 58px 0 34px; }
      .hero-copy p { font-size: 15px; }
      .metric-strip { grid-template-columns: 1fr 1fr; }
      .metric:nth-child(3) { border-left: 0; border-top: 1px solid var(--line); }
      .metric:nth-child(4) { border-top: 1px solid var(--line); }
      .section { padding: 56px 0; }
      .section-head { align-items: start; flex-direction: column; }
      .intro-layout, .rating-layout, .request-layout, .contact-row { grid-template-columns: 1fr; gap: 24px; }
      .capability-list { grid-template-columns: 1fr; }
      .service-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
      .service-card { padding: 15px; min-height: 0; }
      .workflow { grid-template-columns: 1fr 1fr; gap: 20px; }
      .solution-grid, .faq-list { grid-template-columns: 1fr; }
      .case-grid, .review-grid { grid-template-columns: 1fr; }
      .article-grid { grid-template-columns: 1fr 1fr; }
      .request-form { grid-template-columns: 1fr; }
      .field-full { grid-column: auto; }
      .join-band, .footer-top { flex-direction: column; align-items: start; }
      .floating-help { right: 10px; bottom: 10px; }
      .floating-help a { min-width: 42px; min-height: 42px; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
      .reveal { opacity: 1; transform: none; }
    }