:root {
      color-scheme: light;
      --ink: #172236;
      --muted: #58677b;
      --line: #dce4ee;
      --paper: #f7f9fc;
      --white: #fff;
      --blue: #275ee8;
      --cyan: #00a8b5;
      --pink: #e94f91;
      --lime: #c6f36a;
      --shadow: 0 14px 40px rgba(28, 50, 82, .09);
      --container: 1180px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; scroll-padding-top: 88px; }
    body {
      margin: 0;
      background: var(--paper);
      color: var(--ink);
      font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, 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;
      z-index: 20;
      top: 0;
      background: rgba(255,255,255,.94);
      border-bottom: 1px solid rgba(220,228,238,.9);
      backdrop-filter: blur(14px);
    }
    .nav-row { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 22px; }
    .brand { display: inline-flex; align-items: center; gap: 11px; flex: 0 0 auto; font-weight: 800; }
    .ai-page-logo { display: block; width: 40px; max-height: 40px; object-fit: contain; }
    .brand-name { font-size: 17px; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; gap: 0; flex-wrap: wrap; }
    .nav-links a { padding: 9px 10px; color: #435168; font-size: 13px; transition: color .2s; }
    .nav-links a:hover { color: var(--blue); }
    .nav-cta, .button {
      display: inline-flex; align-items: center; justify-content: center; gap: 8px;
      min-height: 44px; padding: 0 18px; border: 0; border-radius: 5px;
      background: var(--blue); color: #fff; font-weight: 700; cursor: pointer;
      transition: transform .2s, box-shadow .2s, background .2s;
    }
    .nav-cta:hover, .button:hover { transform: translateY(-2px); box-shadow: 0 9px 22px rgba(39,94,232,.24); }
    .button.secondary { background: #fff; color: var(--ink); border: 1px solid var(--line); }
    .menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 4px; background: #fff; color: var(--ink); }
    .hero {
      position: relative; overflow: hidden; isolation: isolate;
      padding: 78px 0 54px;
      background: linear-gradient(120deg, #eff6ff 0%, #f6f8ff 48%, #fff4f7 100%);
      border-bottom: 1px solid var(--line);
    }
    .hero::before, .hero::after { content: ""; position: absolute; z-index: -1; pointer-events: none; }
    .hero::before {
      width: 460px; height: 460px; right: -120px; top: -180px;
      border: 1px solid rgba(39,94,232,.16); border-radius: 50%;
      box-shadow: 0 0 0 32px rgba(39,94,232,.035), 0 0 0 66px rgba(0,168,181,.025);
    }
    .hero::after {
      width: 250px; height: 250px; right: 16%; bottom: -220px;
      border: 1px solid rgba(233,79,145,.2); transform: rotate(45deg);
    }
    .hero-grid { display: grid; grid-template-columns: minmax(0,1.2fr) minmax(260px,.8fr); gap: 50px; align-items: center; }
    .eyebrow { display: inline-flex; align-items: center; gap: 9px; color: #2954ba; font-size: 12px; font-weight: 800; text-transform: uppercase; }
    .eyebrow::before { content: ""; width: 22px; height: 2px; background: var(--pink); }
    h1 { max-width: 700px; margin: 15px 0 18px; font-size: clamp(38px, 6vw, 66px); line-height: 1.1; letter-spacing: 0; }
    .hero-copy { max-width: 650px; margin: 0; color: var(--muted); font-size: 17px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
    .hero-note { margin-top: 18px; color: #68768a; font-size: 13px; }
    .hero-panel { padding: 22px 0 22px 26px; border-left: 1px solid rgba(39,94,232,.24); }
    .hero-panel h2 { margin: 0 0 18px; font-size: 15px; }
    .model-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
    .model-cloud span { border: 1px solid #d7e1f0; border-radius: 3px; padding: 5px 9px; background: rgba(255,255,255,.7); color: #36465f; font-size: 12px; }
    .metric-strip { display: grid; grid-template-columns: repeat(4,1fr); gap: 0; padding: 24px 0; }
    .metric { padding: 4px 24px; border-left: 1px solid var(--line); }
    .metric:first-child { padding-left: 0; border-left: 0; }
    .metric strong { display: block; font-size: 21px; line-height: 1.3; }
    .metric span { color: var(--muted); font-size: 12px; }
    .section { padding: 68px 0; border-top: 1px solid rgba(220,228,238,.8); }
    .section-head { display: flex; align-items: end; justify-content: space-between; gap: 22px; margin-bottom: 30px; }
    .section-head > div { max-width: 720px; }
    .kicker { margin: 0 0 8px; color: #2859cf; font-size: 12px; font-weight: 800; }
    h2 { margin: 0; font-size: clamp(27px,4vw,39px); line-height: 1.2; }
    .section-intro { max-width: 700px; margin: 12px 0 0; color: var(--muted); }
    .text-link { color: var(--blue); font-size: 14px; font-weight: 700; white-space: nowrap; }
    .intro-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 46px; align-items: start; }
    .intro-copy p { margin: 0 0 15px; color: var(--muted); }
    .intro-list { display: grid; grid-template-columns: 1fr 1fr; gap: 0 20px; margin: 0; padding: 0; list-style: none; }
    .intro-list li { padding: 12px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
    .intro-list b { display: block; margin-bottom: 3px; }
    .intro-list span { color: var(--muted); }
    .capability-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
    .capability { min-height: 170px; padding: 21px; background: #fff; transition: background .2s, transform .2s; }
    .capability:hover { position: relative; z-index: 1; background: #f5f8ff; transform: translateY(-3px); }
    .capability .number { color: var(--pink); font-size: 12px; font-weight: 800; }
    .capability h3 { margin: 11px 0 7px; font-size: 17px; }
    .capability p { margin: 0; color: var(--muted); font-size: 13px; }
    .workflow { display: grid; grid-template-columns: repeat(4,1fr); border-top: 1px solid #aebcd0; }
    .step { position: relative; padding: 24px 24px 0 0; }
    .step::before { content: ""; position: absolute; top: -5px; width: 9px; height: 9px; border-radius: 50%; background: var(--blue); box-shadow: 0 0 0 4px var(--paper); }
    .step small { color: #65758b; font-weight: 700; }
    .step h3 { margin: 8px 0 5px; font-size: 17px; }
    .step p { margin: 0; color: var(--muted); font-size: 13px; }
    .solution-band { background: #edf3fb; }
    .solution-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 42px; }
    .solution-item { display: grid; grid-template-columns: 130px 1fr; gap: 18px; padding: 18px 0; border-bottom: 1px solid #d5dfec; }
    .solution-item b { color: #264fb2; }
    .solution-item span { color: #526176; font-size: 14px; }
    .image-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 28px; }
    .image-frame { overflow: hidden; background: #e9eef5; border: 1px solid var(--line); }
    .image-frame img { display: block; width: 100%; height: auto; }
    .image-caption { padding: 11px 14px; background: #fff; color: #435168; font-size: 13px; }
    .comparison-layout { display: grid; grid-template-columns: 280px 1fr; gap: 30px; align-items: start; }
    .score-block { padding: 25px; background: #172236; color: #fff; }
    .score-block p { margin: 0; color: #d6deeb; }
    .score { margin: 8px 0 0; color: var(--lime); font-size: 51px; font-weight: 800; line-height: 1.1; }
    .stars { margin: 7px 0 17px; color: var(--lime); letter-spacing: 0; }
    .table-wrap { overflow-x: auto; border: 1px solid var(--line); background: #fff; }
    table { width: 100%; border-collapse: collapse; min-width: 620px; text-align: left; }
    th, td { padding: 13px 15px; border-bottom: 1px solid var(--line); font-size: 13px; vertical-align: top; }
    th { background: #edf3fb; color: #23334c; }
    td { color: #536177; }
    td:first-child { color: var(--ink); font-weight: 700; }
    .reviews { display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; }
    .review { padding: 20px; background: #fff; border-top: 2px solid var(--cyan); box-shadow: 0 7px 22px rgba(28,50,82,.045); }
    .review p { margin: 0 0 17px; color: #45546a; font-size: 14px; }
    .review footer { color: #6b788b; font-size: 12px; }
    .case-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; align-items: start; }
    .case { overflow: hidden; background: #fff; border: 1px solid var(--line); }
    .case img { display: block; width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
    .case-body { padding: 16px; }
    .case-body h3 { margin: 0 0 6px; font-size: 17px; }
    .case-body p { margin: 0; color: var(--muted); font-size: 13px; }
    .faq-list { border-top: 1px solid var(--line); }
    details { border-bottom: 1px solid var(--line); background: transparent; }
    summary { position: relative; padding: 17px 34px 17px 0; cursor: pointer; font-weight: 700; list-style: none; }
    summary::-webkit-details-marker { display: none; }
    summary::after { content: "+"; position: absolute; right: 2px; top: 12px; color: var(--blue); font-size: 22px; font-weight: 400; }
    details[open] summary::after { content: "−"; }
    details p { max-width: 850px; margin: 0 28px 18px 0; color: var(--muted); font-size: 14px; }
    .article-list { display: grid; grid-template-columns: repeat(5,1fr); gap: 0 18px; border-top: 1px solid var(--line); }
    .article-list a { display: block; padding: 15px 0; border-bottom: 1px solid var(--line); color: #35455d; font-size: 13px; transition: color .2s; }
    .article-list a:hover { color: var(--blue); }
    .contact-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 48px; align-items: start; }
    .contact-details { margin: 20px 0; padding: 0; list-style: none; }
    .contact-details li { padding: 9px 0; border-bottom: 1px solid var(--line); color: #4d5c71; font-size: 14px; }
    .contact-details b { display: inline-block; min-width: 96px; color: var(--ink); }
    .qr-wrap { display: flex; gap: 16px; align-items: center; margin-top: 22px; }
    .qr-wrap img { width: 118px; border: 1px solid var(--line); background: #fff; padding: 5px; }
    .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
    .field { display: flex; flex-direction: column; gap: 6px; }
    .field.full { grid-column: 1 / -1; }
    .field label { color: #37465c; font-size: 13px; font-weight: 700; }
    .field input, .field select, .field textarea { width: 100%; min-height: 45px; padding: 10px 12px; border: 1px solid #ccd6e3; border-radius: 3px; background: #fff; color: var(--ink); }
    .field textarea { min-height: 120px; resize: vertical; }
    .field input:focus, .field select:focus, .field textarea:focus { outline: 2px solid rgba(39,94,232,.22); border-color: var(--blue); }
    .form-footnote { margin: 12px 0 0; color: #68768a; font-size: 12px; }
    .join-band { display: flex; justify-content: space-between; align-items: center; gap: 22px; padding: 25px 0 10px; border-top: 1px solid var(--line); }
    .join-band p { margin: 0; color: var(--muted); }
    .site-footer { padding: 24px 0; background: #eaf0f7; color: #334158; border-top: 1px solid #d7e0eb; }
    .footer-row { display: flex; justify-content: space-between; align-items: flex-start; gap: 28px; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 8px 18px; max-width: 760px; }
    .footer-links a { color: #3d5272; font-size: 12px; }
    .copyright { color: #66748a; font-size: 12px; white-space: nowrap; }
    .float-tools { position: fixed; z-index: 15; right: 16px; bottom: 20px; display: grid; gap: 8px; }
    .float-tools a, .float-tools button { display: grid; place-items: center; width: 46px; height: 46px; border: 1px solid #d7e1ef; border-radius: 4px; background: #fff; color: #234cb6; box-shadow: 0 6px 20px rgba(23,34,54,.12); cursor: pointer; }
    .float-tools a span, .float-tools button span { position: absolute; right: 54px; padding: 5px 8px; background: #172236; color: #fff; font-size: 11px; opacity: 0; pointer-events: none; transition: opacity .2s; white-space: nowrap; }
    .float-tools a:hover span, .float-tools button:hover span { opacity: 1; }
    .reveal { opacity: 0; transform: translateY(14px); transition: opacity .55s ease, transform .55s ease; }
    .reveal.is-visible { opacity: 1; transform: translateY(0); }
    @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: 980px) {
      .nav-row { gap: 12px; }
      .nav-links a { padding-inline: 7px; font-size: 12px; }
      .nav-cta { padding-inline: 12px; font-size: 12px; }
      .capability-grid { grid-template-columns: repeat(2,1fr); }
      .article-list { grid-template-columns: repeat(3,1fr); }
    }
    @media (max-width: 760px) {
      .container { width: min(var(--container), calc(100% - 32px)); }
      .nav-row { min-height: 66px; }
      .menu-toggle { display: inline-grid; place-items: center; margin-left: auto; }
      .nav-cta { display: none; }
      .nav-links { display: none; position: absolute; top: 65px; left: 0; right: 0; padding: 9px 16px 14px; align-items: stretch; background: #fff; border-bottom: 1px solid var(--line); box-shadow: 0 12px 18px rgba(23,34,54,.08); }
      .nav-links.is-open { display: grid; grid-template-columns: repeat(2,1fr); }
      .nav-links a { padding: 10px; font-size: 14px; }
      .hero { padding: 54px 0 34px; }
      .hero-grid, .intro-layout, .comparison-layout, .contact-layout { grid-template-columns: 1fr; gap: 28px; }
      .hero-panel { padding: 18px 0 0; border-left: 0; border-top: 1px solid rgba(39,94,232,.24); }
      .metric-strip { grid-template-columns: repeat(2,1fr); gap: 16px 0; }
      .metric:nth-child(3) { padding-left: 0; border-left: 0; }
      .section { padding: 52px 0; }
      .section-head { align-items: flex-start; flex-direction: column; margin-bottom: 24px; }
      .workflow { grid-template-columns: repeat(2,1fr); row-gap: 24px; }
      .solution-grid { grid-template-columns: 1fr; }
      .reviews { grid-template-columns: repeat(2,1fr); }
      .case-grid { grid-template-columns: repeat(2,1fr); }
      .article-list { grid-template-columns: repeat(2,1fr); }
      .footer-row { flex-direction: column; gap: 14px; }
    }
    @media (max-width: 480px) {
      h1 { font-size: 39px; }
      .hero-copy { font-size: 15px; }
      .metric { padding-inline: 13px; }
      .capability-grid, .reviews, .case-grid { grid-template-columns: 1fr; }
      .capability { min-height: auto; }
      .solution-item { grid-template-columns: 105px 1fr; gap: 12px; }
      .image-row { grid-template-columns: 1fr; }
      .intro-list { grid-template-columns: 1fr; }
      .form-grid { grid-template-columns: 1fr; }
      .field.full { grid-column: auto; }
      .join-band { align-items: flex-start; flex-direction: column; }
      .article-list { grid-template-columns: 1fr; }
      .copyright { white-space: normal; }
    }