:root {
      color-scheme: light;
      --ink: #18212d;
      --muted: #586575;
      --paper: #f7f9fc;
      --white: #fff;
      --line: #dce4ed;
      --teal: #007f78;
      --teal-soft: #dff6f1;
      --coral: #d94f48;
      --lime: #d7fa70;
      --navy: #142c37;
      --container: 1160px;
    }
    * { 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; }
    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(255,255,255,.96);
      border-bottom: 1px solid var(--line); backdrop-filter: blur(14px);
    }
    .nav-row { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 22px; }
    .brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 800; white-space: nowrap; }
    .ai-page-logo { display: block; width: 38px; height: auto; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; flex-wrap: wrap; gap: 0; }
    .nav-links a { padding: 8px 9px; color: #3e4c5a; text-decoration: none; font-size: 13px; border-radius: 5px; }
    .nav-links a:hover, .nav-links a:focus-visible { color: var(--teal); background: #eaf7f4; }
    .nav-action, .button {
      display: inline-flex; justify-content: center; align-items: center; gap: 8px;
      min-height: 44px; padding: 10px 17px; border: 0; border-radius: 5px;
      background: var(--teal); color: #fff; text-decoration: none; font-weight: 700;
      cursor: pointer; transition: transform .18s ease, background .18s ease, box-shadow .18s ease;
    }
    .nav-action { flex: 0 0 auto; }
    .button:hover, .nav-action:hover { background: #00665f; transform: translateY(-2px); box-shadow: 0 8px 20px rgba(0,127,120,.2); }
    .button.secondary { background: #fff; color: var(--ink); border: 1px solid #b8c5d0; }
    .button.secondary:hover { background: #eef4f5; }
    .menu-toggle { display: none; border: 1px solid var(--line); background: #fff; color: var(--ink); border-radius: 5px; padding: 9px 12px; font-size: 14px; }
    .hero {
      overflow: hidden; position: relative; color: #fff;
      background: var(--navy);
      border-bottom: 5px solid var(--lime);
    }
    .hero::before {
      content: ""; position: absolute; inset: 0;
      background: linear-gradient(115deg, rgba(0,127,120,.25), transparent 48%, rgba(217,79,72,.18));
      pointer-events: none;
    }
    .hero-inner { position: relative; display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(240px, .7fr); gap: 54px; align-items: center; padding-block: 68px 56px; }
    .eyebrow { margin: 0 0 14px; color: #bdece2; font-size: 13px; font-weight: 750; letter-spacing: 0; }
    h1 { max-width: 660px; margin: 0; font-size: clamp(38px, 5vw, 62px); line-height: 1.12; letter-spacing: 0; }
    .hero-copy { max-width: 650px; margin: 20px 0 25px; color: #d7e2e5; font-size: 17px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 11px; }
    .hero .button.secondary { background: transparent; color: #fff; border-color: #799198; }
    .hero .button.secondary:hover { background: rgba(255,255,255,.1); }
    .hero-aside { padding: 22px 0 22px 25px; border-left: 1px solid rgba(255,255,255,.26); }
    .hero-aside strong { display: block; margin-bottom: 12px; color: var(--lime); font-size: 13px; }
    .hero-aside p { margin: 8px 0; color: #e3ebec; font-size: 14px; }
    .hero-aside .signal { display: flex; align-items: center; gap: 10px; padding: 11px 0; border-bottom: 1px solid rgba(255,255,255,.16); }
    .signal-mark { width: 9px; height: 9px; background: var(--lime); transform: rotate(45deg); flex: 0 0 auto; }
    .hero-bottom { display: flex; flex-wrap: wrap; gap: 10px 28px; padding: 15px 0 19px; border-top: 1px solid rgba(255,255,255,.18); color: #d7e2e5; font-size: 13px; }
    .hero-bottom b { color: #fff; }
    main { overflow: clip; }
    .section { padding-block: 68px; scroll-margin-top: 86px; }
    .section.tint { background: #eef4f5; border-block: 1px solid #e0e8ea; }
    .section.dark { background: var(--navy); color: #f8fbfc; }
    .section-heading { display: flex; justify-content: space-between; align-items: end; gap: 24px; margin-bottom: 28px; }
    .section-heading > div { max-width: 700px; }
    .kicker { margin: 0 0 7px; color: var(--teal); font-size: 12px; font-weight: 800; }
    .dark .kicker { color: var(--lime); }
    h2 { margin: 0; font-size: clamp(27px, 3vw, 38px); line-height: 1.25; letter-spacing: 0; }
    h3 { margin: 0 0 8px; font-size: 18px; line-height: 1.4; }
    .section-intro { max-width: 680px; margin: 10px 0 0; color: var(--muted); }
    .dark .section-intro { color: #c5d4d7; }
    .text-link { color: var(--teal); font-weight: 700; text-decoration-thickness: 1px; text-underline-offset: 4px; }
    .platform-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 42px; align-items: start; }
    .platform-copy p { margin: 0 0 15px; color: var(--muted); }
    .metric-list { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
    .metric { padding: 18px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #fff; }
    .metric strong { display: block; color: var(--teal); font-size: 21px; }
    .metric span { color: var(--muted); font-size: 13px; }
    .service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
    .service-item { padding: 19px; background: #fff; border: 1px solid var(--line); border-top: 3px solid var(--teal); transition: transform .2s ease, box-shadow .2s ease; }
    .service-item:hover { transform: translateY(-3px); box-shadow: 0 12px 26px rgba(26,48,59,.09); }
    .service-item p { margin: 0; color: var(--muted); font-size: 14px; }
    .service-item .service-tag { display: inline-block; margin-top: 12px; color: #006e68; font-size: 12px; font-weight: 750; }
    .workflow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; counter-reset: step; }
    .workflow article { position: relative; padding: 20px 20px 20px 0; border-top: 2px solid #a8cbc6; counter-increment: step; }
    .workflow article::before { content: "0" counter(step); display: block; margin: -34px 0 20px; color: var(--coral); font-size: 13px; font-weight: 800; }
    .workflow p { margin: 0; color: var(--muted); font-size: 14px; }
    .solution-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 25px; }
    .solution { padding-top: 15px; border-top: 1px solid #bdcbd0; }
    .solution p { margin: 0; color: var(--muted); font-size: 14px; }
    .model-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
    .model-cloud span { display: inline-block; padding: 7px 11px; color: #214148; background: #e4f4ef; border: 1px solid #c7e6dd; font-size: 13px; }
    .timeline { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
    .timeline-item { padding: 17px 0 0; border-top: 3px solid var(--coral); }
    .timeline-item strong { display: block; margin-bottom: 5px; }
    .timeline-item p { margin: 0; color: var(--muted); font-size: 14px; }
    .case-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; align-items: start; }
    .case-copy { padding: 0 18px 0 0; }
    .case-copy p { color: var(--muted); }
    .case-images { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; align-items: start; }
    .case-images figure { margin: 0; }
    .case-images img { display: block; width: 100%; height: auto; border: 1px solid var(--line); }
    .case-images figcaption { margin-top: 7px; color: var(--muted); font-size: 12px; }
    .review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
    .review { padding: 18px; background: #fff; border-left: 3px solid var(--coral); }
    .review p { margin: 0 0 14px; color: #394653; font-size: 14px; }
    .review cite { color: var(--muted); font-size: 12px; font-style: normal; font-weight: 700; }
    .score-panel { display: grid; grid-template-columns: .75fr 1.25fr; gap: 30px; align-items: center; margin-bottom: 26px; padding: 23px; color: var(--ink); background: var(--lime); }
    .score-panel strong { display: block; font-size: 44px; line-height: 1; }
    .score-panel .stars { color: #774800; font-size: 20px; letter-spacing: 0; }
    .score-panel p { margin: 8px 0 0; font-size: 14px; }
    .table-wrap { overflow-x: auto; border: 1px solid #49616a; }
    table { width: 100%; border-collapse: collapse; min-width: 650px; color: #f8fbfc; text-align: left; }
    th, td { padding: 13px 15px; border-bottom: 1px solid #405760; vertical-align: top; }
    th { color: var(--lime); background: #1b3944; font-size: 13px; }
    td { font-size: 14px; }
    td:first-child { font-weight: 700; }
    .match-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 38px; align-items: start; }
    .match-points { padding: 0; margin: 20px 0 0; list-style: none; }
    .match-points li { padding: 10px 0; border-bottom: 1px solid var(--line); color: var(--muted); }
    .match-points li::before { content: "✓"; margin-right: 10px; color: var(--teal); font-weight: 800; }
    .reference-note { padding: 18px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); color: var(--muted); }
    .reference-note strong { color: var(--ink); }
    .faq-list { border-top: 1px solid var(--line); }
    .faq-item { border-bottom: 1px solid var(--line); }
    .faq-item summary { position: relative; padding: 17px 34px 17px 0; cursor: pointer; font-weight: 700; list-style: none; }
    .faq-item summary::-webkit-details-marker { display: none; }
    .faq-item summary::after { content: "+"; position: absolute; right: 5px; top: 13px; color: var(--teal); font-size: 22px; }
    .faq-item[open] summary::after { content: "−"; }
    .faq-item p { max-width: 850px; margin: 0; padding: 0 34px 17px 0; color: var(--muted); }
    .article-list { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; }
    .article-list a { display: flex; align-items: center; justify-content: space-between; min-height: 58px; padding: 12px; border: 1px solid var(--line); background: #fff; color: var(--ink); text-decoration: none; font-size: 13px; }
    .article-list a:hover { border-color: var(--teal); color: var(--teal); }
    .article-list span { margin-left: 8px; color: var(--teal); }
    .contact-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 42px; align-items: start; }
    .contact-details { display: grid; gap: 12px; margin-top: 20px; }
    .contact-details p { margin: 0; color: var(--muted); }
    .contact-details a { color: var(--teal); font-weight: 700; }
    .qr { width: 148px; padding: 6px; border: 1px solid var(--line); background: #fff; }
    .qr img { display: block; width: 100%; height: auto; }
    .contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; padding: 20px; background: #fff; border: 1px solid var(--line); }
    .field { display: grid; gap: 6px; }
    .field.full { grid-column: 1 / -1; }
    label { font-size: 13px; font-weight: 700; }
    input, select, textarea { width: 100%; min-height: 44px; padding: 10px 11px; border: 1px solid #bdc9d2; border-radius: 3px; background: #fff; color: var(--ink); font: inherit; }
    textarea { min-height: 116px; resize: vertical; }
    input:focus, select:focus, textarea:focus { outline: 2px solid #90d4c9; outline-offset: 1px; border-color: var(--teal); }
    .form-note { grid-column: 1 / -1; margin: 0; color: var(--muted); font-size: 12px; }
    .join-band { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding: 22px 0; border-top: 1px solid var(--line); }
    .join-band p { margin: 4px 0 0; color: var(--muted); }
    .site-footer { background: #e8eef1; color: #263440; border-top: 1px solid #d4dee3; }
    .footer-main { display: grid; grid-template-columns: 1fr 1.3fr; gap: 32px; padding-block: 28px; }
    .footer-main p { margin: 8px 0 0; color: #53616d; font-size: 13px; }
    .friend-links { display: flex; flex-wrap: wrap; gap: 8px 16px; align-content: start; }
    .friend-links a { color: #245a57; font-size: 13px; }
    .copyright { padding-block: 12px; border-top: 1px solid #d4dee3; color: #53616d; font-size: 12px; }
    .floating { position: fixed; right: 18px; bottom: 18px; z-index: 15; display: grid; gap: 8px; }
    .floating a { display: grid; place-items: center; width: 48px; height: 48px; border: 1px solid #c7d5d8; background: #fff; color: var(--teal); text-decoration: none; font-size: 12px; font-weight: 800; box-shadow: 0 5px 18px rgba(20,44,55,.12); }
    .reveal { opacity: 0; transform: translateY(12px); transition: opacity .5s ease, transform .5s ease; }
    .reveal.visible { opacity: 1; transform: none; }
    @media (max-width: 980px) {
      .menu-toggle { display: inline-flex; align-items: center; gap: 7px; }
      .nav-action { display: none; }
      .nav-row { flex-wrap: wrap; padding-block: 12px; }
      .nav-links { display: none; flex: 1 0 100%; justify-content: flex-start; padding: 8px 0 3px; border-top: 1px solid var(--line); }
      .nav-links.open { display: flex; }
      .nav-links a { padding: 9px 12px; }
      .hero-inner { grid-template-columns: 1fr .65fr; gap: 28px; }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .article-list { grid-template-columns: repeat(3, 1fr); }
    }
    @media (max-width: 680px) {
      .container { width: min(100% - 30px, var(--container)); }
      .nav-row { min-height: 64px; }
      .hero-inner { grid-template-columns: 1fr; padding-block: 48px 30px; gap: 26px; }
      .hero-aside { padding: 18px 0 0; border-left: 0; border-top: 1px solid rgba(255,255,255,.24); }
      .hero-bottom { gap: 8px 18px; }
      .section { padding-block: 48px; }
      .section-heading { display: block; }
      .section-heading > .text-link { display: inline-block; margin-top: 12px; }
      .platform-grid, .case-grid, .match-layout, .contact-layout, .footer-main { grid-template-columns: 1fr; gap: 24px; }
      .service-grid, .review-grid { grid-template-columns: 1fr; }
      .workflow { grid-template-columns: 1fr 1fr; gap: 28px 15px; }
      .solution-grid { grid-template-columns: 1fr 1fr; gap: 20px; }
      .timeline { grid-template-columns: 1fr 1fr; gap: 23px 15px; }
      .score-panel { grid-template-columns: 1fr; gap: 14px; }
      .article-list { grid-template-columns: 1fr 1fr; }
      .contact-form { grid-template-columns: 1fr; padding: 15px; }
      .field.full, .form-note { grid-column: auto; }
      .join-band { align-items: flex-start; flex-direction: column; }
      .case-images { gap: 8px; }
      .floating { right: 10px; bottom: 10px; }
    }
    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
      .reveal { opacity: 1; transform: none; }
    }