:root {
      color-scheme: light;
      --ink: #202331;
      --muted: #626879;
      --line: #e3e6ed;
      --paper: #f8f9fc;
      --white: #fff;
      --violet: #6245d7;
      --blue: #3478d4;
      --teal: #078c8c;
      --lime: #d9ee8c;
      --coral: #ef765d;
      --shadow: 0 14px 36px rgba(35, 39, 59, .08);
      --content: 1160px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; scroll-padding-top: 88px; }
    body {
      margin: 0;
      background: var(--paper);
      color: var(--ink);
      font-family: Inter, "SF Pro Display", "Segoe UI", "Noto Sans CJK SC", "Microsoft YaHei", sans-serif;
      line-height: 1.65;
    }
    img { display: block; max-width: 100%; height: auto; }
    a { color: inherit; text-decoration: none; }
    button, input, select, textarea { font: inherit; }
    button, a, summary { -webkit-tap-highlight-color: transparent; }
    .container { width: min(var(--content), calc(100% - 40px)); margin-inline: auto; }
    .site-header {
      position: sticky; top: 0; z-index: 20;
      background: rgba(248,249,252,.94);
      border-bottom: 1px solid rgba(222,225,234,.9);
      backdrop-filter: blur(14px);
    }
    .nav-row { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
    .brand { display: inline-flex; align-items: center; flex-shrink: 0; }
    .ai-page-logo { width: 142px; height: auto; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; gap: 0; }
    .nav-links a { padding: 10px 11px; color: #414656; font-size: 13px; white-space: nowrap; transition: color .2s ease; }
    .nav-links a:hover { color: var(--violet); }
    .nav-links .nav-cta { margin-left: 8px; padding: 10px 16px; border-radius: 5px; background: var(--ink); color: #fff; }
    .nav-links .nav-cta:hover { background: var(--violet); color: #fff; }
    .menu-toggle { display: none; align-items: center; justify-content: center; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 5px; background: var(--white); color: var(--ink); cursor: pointer; }
    .hero {
      position: relative; overflow: hidden; isolation: isolate;
      padding: 92px 0 44px;
      background:
        linear-gradient(116deg, rgba(255,255,255,.95), rgba(248,246,255,.88) 49%, rgba(236,249,248,.92)),
        var(--paper);
      border-bottom: 1px solid var(--line);
    }
    .hero::before, .hero::after { content: ""; position: absolute; z-index: -1; pointer-events: none; }
    .hero::before {
      width: 490px; height: 490px; right: -105px; top: -205px;
      border: 1px solid rgba(98,69,215,.17); border-radius: 50%;
      box-shadow: 0 0 0 38px rgba(52,120,212,.035), 0 0 0 86px rgba(7,140,140,.025);
      animation: orbit 22s linear infinite;
    }
    .hero::after {
      width: 340px; height: 170px; right: 8%; bottom: 38px;
      border: 1px solid rgba(7,140,140,.22);
      transform: skewY(-26deg) rotate(-8deg);
      opacity: .7;
    }
    .hero-content { max-width: 810px; position: relative; }
    .eyebrow { display: inline-flex; align-items: center; gap: 9px; color: var(--violet); font-size: 12px; font-weight: 700; letter-spacing: 1.3px; text-transform: uppercase; }
    .eyebrow::before { content: ""; width: 23px; height: 2px; background: var(--coral); }
    h1 { max-width: 760px; margin: 18px 0 16px; font-size: clamp(38px, 5vw, 64px); line-height: 1.12; font-weight: 750; letter-spacing: 0; }
    .hero h1 span { color: var(--violet); }
    .hero-copy { max-width: 650px; margin: 0; color: #555b6c; font-size: 17px; }
    .hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-top: 28px; }
    .button { display: inline-flex; align-items: center; justify-content: center; gap: 9px; min-height: 48px; padding: 12px 20px; border: 1px solid transparent; border-radius: 5px; font-size: 14px; font-weight: 650; transition: transform .2s ease, background .2s ease, box-shadow .2s ease; cursor: pointer; }
    .button:hover { transform: translateY(-2px); }
    .button-primary { color: #fff; background: var(--violet); box-shadow: 0 8px 18px rgba(98,69,215,.2); }
    .button-primary:hover { background: #5136c3; box-shadow: 0 11px 22px rgba(98,69,215,.27); }
    .button-light { color: var(--ink); background: #fff; border-color: #dfe2eb; }
    .button-dark { background: var(--ink); color: #fff; }
    .button-dark:hover { background: #353a4a; }
    .hero-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
    .hero-tags span { padding: 6px 10px; border: 1px solid rgba(97,83,156,.17); border-radius: 3px; background: rgba(255,255,255,.62); color: #52586a; font-size: 12px; }
    .hero-foot { margin-top: 62px; display: flex; justify-content: space-between; align-items: center; gap: 20px; color: #606779; font-size: 12px; }
    .hero-foot strong { color: var(--ink); font-weight: 650; }
    .hero-foot .rule { height: 1px; flex: 1; background: linear-gradient(90deg, var(--violet), #93d8c8, transparent); }
    .section { padding: 78px 0; border-bottom: 1px solid var(--line); }
    .section-tint { background: #f1f3f9; }
    .section-white { background: #fff; }
    .section-head { max-width: 720px; margin-bottom: 34px; }
    .section-kicker { margin: 0 0 9px; color: var(--teal); font-size: 12px; font-weight: 750; letter-spacing: 1.1px; text-transform: uppercase; }
    h2 { margin: 0; font-size: clamp(28px, 3vw, 39px); line-height: 1.2; letter-spacing: 0; }
    .section-intro { margin: 13px 0 0; color: var(--muted); font-size: 15px; }
    h3 { margin: 0; font-size: 18px; line-height: 1.35; }
    .metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; background: #fff; border: 1px solid var(--line); }
    .metric { padding: 23px 24px; border-right: 1px solid var(--line); }
    .metric:last-child { border-right: 0; }
    .metric strong { display: block; font-size: 19px; line-height: 1.3; }
    .metric span { display: block; margin-top: 6px; color: var(--muted); font-size: 12px; }
    .intro-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 55px; align-items: start; }
    .intro-copy p { color: var(--muted); margin: 15px 0 0; }
    .intro-list { display: grid; grid-template-columns: 1fr 1fr; gap: 0 22px; margin: 5px 0 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
    .intro-list li { padding: 15px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
    .intro-list strong { display: block; margin-bottom: 3px; color: var(--ink); }
    .intro-list span { color: var(--muted); font-size: 12px; }
    .service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 13px; }
    .service-item { min-height: 156px; padding: 22px; background: #fff; border: 1px solid var(--line); transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease; }
    .service-item:hover { transform: translateY(-4px); border-color: #c7bee9; box-shadow: var(--shadow); }
    .service-no { display: block; margin-bottom: 15px; color: var(--violet); font-size: 11px; font-weight: 750; }
    .service-item p { margin: 9px 0 0; color: var(--muted); font-size: 13px; }
    .service-item.featured { background: #26243a; color: #fff; border-color: #26243a; }
    .service-item.featured .service-no { color: #c7baff; }
    .service-item.featured p { color: #d4d3df; }
    .workflow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; counter-reset: step; }
    .workflow article { position: relative; padding: 22px 20px 20px 0; border-top: 2px solid #c7cbd7; counter-increment: step; }
    .workflow article::before { content: "0" counter(step); display: block; margin-bottom: 18px; color: var(--violet); font-size: 13px; font-weight: 750; }
    .workflow article p { margin: 8px 0 0; color: var(--muted); font-size: 13px; }
    .split-feature { display: grid; grid-template-columns: .85fr 1.15fr; gap: 44px; align-items: center; }
    .feature-copy p { color: var(--muted); }
    .feature-copy .button { margin-top: 12px; }
    .media-stack { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; align-items: start; }
    .media-frame { overflow: hidden; background: #e9ebf2; border: 1px solid var(--line); }
    .media-frame img { width: 100%; height: auto; object-fit: contain; }
    .media-frame.offset { margin-top: 31px; }
    .case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
    .case { overflow: hidden; background: #fff; border: 1px solid var(--line); }
    .case-media { aspect-ratio: 4 / 3; overflow: hidden; background: #eceef3; }
    .case-media img { width: 100%; height: 100%; object-fit: cover; }
    .case-copy { padding: 18px 19px 20px; }
    .case-copy p { margin: 8px 0 0; color: var(--muted); font-size: 13px; }
    .case-label { display: block; margin-bottom: 8px; color: var(--teal); font-size: 11px; font-weight: 700; }
    .model-band { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 26px; }
    .model-band span { padding: 7px 11px; border: 1px solid #daddE7; background: #fff; color: #424859; font-size: 12px; }
    .comparison { display: grid; grid-template-columns: .7fr 1.3fr; gap: 35px; align-items: start; }
    .score-box { padding: 26px; background: #25243a; color: #fff; }
    .score-box .stars { color: #d9ee8c; font-size: 20px; letter-spacing: 2px; }
    .score-box strong { display: block; margin-top: 14px; font-size: 42px; line-height: 1; }
    .score-box strong small { font-size: 15px; color: #d2d1df; font-weight: 500; }
    .score-box p { margin: 12px 0 0; color: #d7d6e2; font-size: 13px; }
    .table-wrap { overflow-x: auto; border: 1px solid var(--line); background: #fff; }
    table { width: 100%; border-collapse: collapse; min-width: 540px; text-align: left; }
    th, td { padding: 13px 15px; border-bottom: 1px solid var(--line); font-size: 13px; vertical-align: top; }
    th { color: #464b5a; background: #f2f3f8; font-weight: 700; }
    td:last-child { color: #355a4d; }
    tr:last-child td { border-bottom: 0; }
    .reviews { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
    .review { padding: 20px; border-top: 2px solid var(--teal); background: #fff; }
    .review blockquote { margin: 0; color: #414657; font-size: 14px; }
    .review footer { margin-top: 16px; color: var(--muted); font-size: 12px; }
    .review footer strong { display: block; color: var(--ink); font-size: 13px; }
    .quote-note { margin-top: 17px; color: var(--muted); font-size: 12px; }
    .faq-list { border-top: 1px solid var(--line); }
    .faq-list details { border-bottom: 1px solid var(--line); }
    .faq-list summary { position: relative; padding: 18px 36px 18px 0; list-style: none; cursor: pointer; font-weight: 650; }
    .faq-list summary::-webkit-details-marker { display: none; }
    .faq-list summary::after { content: "+"; position: absolute; right: 5px; top: 14px; color: var(--violet); font-size: 22px; font-weight: 400; }
    .faq-list details[open] summary::after { content: "−"; }
    .faq-list details p { max-width: 850px; margin: -3px 40px 18px 0; color: var(--muted); font-size: 14px; }
    .news-area { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: start; }
    .news-shortcode { padding: 19px; border-left: 3px solid var(--violet); background: #fff; color: #3f4453; }
    .article-links { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
    .article-links li { border-bottom: 1px solid var(--line); }
    .article-links a { display: flex; justify-content: space-between; gap: 15px; padding: 13px 0; color: #414657; font-size: 13px; }
    .article-links a:hover { color: var(--violet); }
    .article-links span { color: var(--violet); white-space: nowrap; }
    .contact-grid { display: grid; grid-template-columns: .72fr 1.28fr; gap: 42px; align-items: start; }
    .contact-info p { color: var(--muted); font-size: 14px; }
    .contact-lines { margin-top: 20px; border-top: 1px solid var(--line); }
    .contact-lines div { padding: 11px 0; border-bottom: 1px solid var(--line); font-size: 13px; }
    .contact-lines span { display: inline-block; min-width: 110px; color: var(--muted); }
    .qr-wrap { width: 150px; margin-top: 18px; padding: 9px; border: 1px solid var(--line); background: #fff; }
    .qr-wrap img { width: 100%; height: auto; }
    .request-form { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; padding: 24px; background: #fff; border: 1px solid var(--line); }
    .field { display: flex; flex-direction: column; gap: 6px; }
    .field.full { grid-column: 1 / -1; }
    .field label { color: #464b5a; font-size: 12px; font-weight: 650; }
    .field input, .field select, .field textarea { width: 100%; min-height: 44px; padding: 10px 12px; border: 1px solid #d9dce5; border-radius: 3px; background: #fff; color: var(--ink); outline: none; }
    .field textarea { min-height: 112px; resize: vertical; }
    .field input:focus, .field select:focus, .field textarea:focus { border-color: var(--violet); box-shadow: 0 0 0 3px rgba(98,69,215,.1); }
    .request-form .button { justify-self: start; }
    .form-note { align-self: center; margin: 0; color: var(--muted); font-size: 11px; }
    .links-row { display: flex; flex-wrap: wrap; gap: 9px 18px; padding-top: 23px; }
    .links-row a { color: #525869; font-size: 12px; text-decoration: underline; text-decoration-color: #c4c8d4; text-underline-offset: 3px; }
    .links-row a:hover { color: var(--violet); }
    .footer { padding: 26px 0; background: #202331; color: #f4f5f8; }
    .footer-row { display: flex; justify-content: space-between; align-items: center; gap: 20px; }
    .footer p { margin: 0; color: #d4d6df; font-size: 12px; }
    .footer a { color: #e6e2ff; }
    .floating-tools { position: fixed; right: 18px; bottom: 20px; z-index: 15; display: grid; gap: 8px; }
    .floating-tools a, .floating-tools button { display: flex; align-items: center; justify-content: center; width: 45px; height: 45px; border: 1px solid #dedfeb; border-radius: 5px; background: #fff; color: var(--ink); box-shadow: 0 5px 18px rgba(35,39,59,.12); cursor: pointer; font-size: 12px; }
    .floating-tools a:hover, .floating-tools button:hover { color: var(--violet); border-color: #c8bdf1; }
    .reveal { opacity: 0; transform: translateY(16px); transition: opacity .55s ease, transform .55s ease; }
    .reveal.is-visible { opacity: 1; transform: translateY(0); }
    @keyframes orbit { to { transform: rotate(360deg); } }
    @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: 1000px) {
      .nav-links a { padding-inline: 7px; font-size: 12px; }
      .nav-links .nav-cta { margin-left: 4px; padding-inline: 12px; }
      .ai-page-logo { width: 120px; }
    }
    @media (max-width: 820px) {
      .menu-toggle { display: inline-flex; }
      .nav-row { min-height: 66px; }
      .nav-links { display: none; position: absolute; top: 65px; left: 0; right: 0; align-items: stretch; padding: 10px 20px 16px; background: #f8f9fc; border-bottom: 1px solid var(--line); box-shadow: 0 14px 20px rgba(35,39,59,.08); }
      .nav-links.is-open { display: grid; grid-template-columns: 1fr 1fr; }
      .nav-links a { padding: 11px 8px; font-size: 13px; }
      .nav-links .nav-cta { margin: 4px 0 0; text-align: center; }
      .hero { padding-top: 70px; }
      .hero-foot { margin-top: 46px; }
      .intro-grid, .split-feature, .comparison, .contact-grid { grid-template-columns: 1fr; gap: 30px; }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .case-grid, .reviews { grid-template-columns: repeat(2, 1fr); }
      .workflow { grid-template-columns: repeat(2, 1fr); }
      .news-area { grid-template-columns: 1fr; }
      .score-box { max-width: 440px; }
    }
    @media (max-width: 560px) {
      .container { width: min(var(--content), calc(100% - 32px)); }
      .section { padding: 58px 0; }
      .hero { padding: 58px 0 28px; }
      h1 { font-size: 39px; }
      .hero-copy { font-size: 15px; }
      .hero-foot { align-items: flex-start; flex-direction: column; gap: 9px; margin-top: 38px; }
      .hero-foot .rule { width: 100%; flex: auto; }
      .metrics { grid-template-columns: 1fr 1fr; }
      .metric { padding: 17px; border-bottom: 1px solid var(--line); }
      .metric:nth-child(2) { border-right: 0; }
      .metric:nth-child(3), .metric:nth-child(4) { border-bottom: 0; }
      .intro-list { grid-template-columns: 1fr; }
      .service-grid, .case-grid, .reviews { grid-template-columns: 1fr; }
      .workflow { grid-template-columns: 1fr 1fr; gap: 15px; }
      .workflow article { padding-right: 8px; }
      .media-stack { gap: 8px; }
      .request-form { grid-template-columns: 1fr; padding: 18px; }
      .field.full { grid-column: auto; }
      .footer-row { align-items: flex-start; flex-direction: column; }
      .floating-tools { right: 10px; bottom: 12px; }
      .floating-tools a, .floating-tools button { width: 41px; height: 41px; }
    }