:root {
      color-scheme: light;
      --ink: #1d2119;
      --muted: #62675e;
      --paper: #fffdf5;
      --white: #fff;
      --yellow: #f5cf19;
      --yellow-dark: #d8ad00;
      --green: #244b3c;
      --line: #e8e6d9;
      --soft: #f5f3e9;
      --container: 1160px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; scroll-padding-top: 88px; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      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; }
    .topbar { position: sticky; top: 0; z-index: 20; background: rgba(255,253,245,.96); border-bottom: 1px solid var(--line); backdrop-filter: blur(12px); }
    .nav { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
    .brand { display: inline-flex; align-items: center; gap: 10px; flex: 0 0 auto; font-weight: 800; }
    .ai-page-logo { display: block; width: 40px; max-width: 100%; height: auto; }
    .brand-name { font-size: 17px; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; flex-wrap: wrap; gap: 0; }
    .nav-links a { padding: 8px 9px; color: #42463e; font-size: 13px; transition: color .2s ease; }
    .nav-links a:hover { color: #997800; }
    .nav-cta, .button { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 18px; border: 1px solid var(--ink); background: var(--ink); color: #fff; font-weight: 700; transition: transform .2s ease, background .2s ease, box-shadow .2s ease; }
    .nav-cta { flex: 0 0 auto; min-height: 40px; padding-inline: 14px; font-size: 13px; }
    .button:hover, .nav-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(29,33,25,.15); }
    .button-yellow { color: var(--ink); background: var(--yellow); border-color: var(--yellow); }
    .button-outline { background: transparent; color: var(--ink); }
    .menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); background: transparent; color: var(--ink); cursor: pointer; }
    .hero { overflow: hidden; position: relative; padding: 72px 0 46px; background: var(--yellow); }
    .hero::after { content: ""; position: absolute; right: -100px; top: 20px; width: 380px; height: 380px; border: 1px solid rgba(29,33,25,.16); border-radius: 50%; box-shadow: 0 0 0 34px rgba(29,33,25,.035), 0 0 0 72px rgba(29,33,25,.025); pointer-events: none; }
    .hero-inner { position: relative; z-index: 1; max-width: 820px; }
    .eyebrow { display: inline-flex; align-items: center; gap: 8px; margin: 0 0 18px; font-size: 12px; font-weight: 800; text-transform: uppercase; }
    .eyebrow::before { content: ""; width: 23px; height: 2px; background: currentColor; }
    h1 { max-width: 760px; margin: 0; font-size: clamp(42px, 6vw, 76px); line-height: 1.08; font-weight: 850; }
    .hero-copy { max-width: 650px; margin: 22px 0 26px; color: #34372c; font-size: 18px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
    .hero-note { margin: 16px 0 0; color: #4e4c3d; font-size: 13px; }
    .hero-strip { margin-top: 42px; display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid rgba(29,33,25,.25); }
    .hero-stat { padding: 18px 16px 0 0; }
    .hero-stat strong { display: block; font-size: 21px; }
    .hero-stat span { color: #48483d; font-size: 13px; }
    section { padding: 76px 0; }
    .section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 30px; }
    .section-head > div { max-width: 720px; }
    .kicker { margin: 0 0 8px; color: #7a6500; font-size: 12px; font-weight: 800; }
    h2 { margin: 0; font-size: clamp(28px, 4vw, 42px); line-height: 1.2; }
    .section-intro { max-width: 620px; margin: 12px 0 0; color: var(--muted); }
    .text-link { color: #635000; font-weight: 700; border-bottom: 1px solid currentColor; white-space: nowrap; }
    .about-layout { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: start; }
    .about-copy { max-width: 570px; color: var(--muted); }
    .about-copy p:first-child { margin-top: 0; color: var(--ink); font-size: 18px; }
    .capability-list { display: grid; grid-template-columns: 1fr 1fr; gap: 0 22px; padding: 0; margin: 20px 0 0; list-style: none; }
    .capability-list li { padding: 12px 0; border-bottom: 1px solid var(--line); font-weight: 650; }
    .capability-list li::before { content: "＋"; margin-right: 8px; color: #997800; }
    .model-band { padding: 28px; background: var(--green); color: #fff; }
    .model-band h3 { margin: 0 0 12px; font-size: 18px; }
    .model-band p { margin: 0; color: #e1e8e1; font-size: 14px; }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
    .tag-cloud span { padding: 5px 9px; border: 1px solid rgba(255,255,255,.3); color: #fff; font-size: 12px; }
    .services { background: #f4f2e7; }
    .service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: #dedccd; border: 1px solid #dedccd; }
    .service-item { min-height: 178px; padding: 24px; background: #faf9f2; transition: background .2s ease; }
    .service-item:hover { background: #fff3aa; }
    .service-item .num { color: #8b7200; font-size: 12px; font-weight: 800; }
    .service-item h3 { margin: 10px 0 6px; font-size: 19px; }
    .service-item p { margin: 0; color: var(--muted); font-size: 14px; }
    .workflow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
    .step { position: relative; padding: 24px 24px 24px 0; }
    .step:not(:last-child)::after { content: "→"; position: absolute; right: 14px; top: 28px; color: #a58a10; font-size: 22px; }
    .step small { color: #8b7200; font-weight: 800; }
    .step h3 { margin: 8px 0; font-size: 18px; }
    .step p { margin: 0; color: var(--muted); font-size: 14px; }
    .industry { background: var(--green); color: #fff; }
    .industry .kicker { color: #f4d64e; }
    .industry .section-intro { color: #d6e0d9; }
    .industry-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
    .industry-item { padding-top: 18px; border-top: 1px solid rgba(255,255,255,.35); }
    .industry-item h3 { margin: 0 0 8px; color: var(--yellow); font-size: 18px; }
    .industry-item p { margin: 0; color: #e2e9e4; font-size: 14px; }
    .network { display: grid; grid-template-columns: .8fr 1.2fr; align-items: start; gap: 50px; }
    .network-copy p { color: var(--muted); }
    .network-points { display: grid; grid-template-columns: 1fr 1fr; gap: 18px 24px; }
    .network-points article { padding: 15px 0; border-top: 2px solid var(--yellow-dark); }
    .network-points h3 { margin: 0 0 5px; font-size: 16px; }
    .network-points p { margin: 0; color: var(--muted); font-size: 13px; }
    .cases { background: #f4f2e7; }
    .case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .case { background: var(--white); }
    .case-media { aspect-ratio: 16 / 9; overflow: hidden; background: #e9e6d8; }
    .case-media img { display: block; width: 100%; height: 100%; object-fit: cover; }
    .case-copy { padding: 18px 20px 20px; }
    .case-copy span { color: #7a6500; font-size: 12px; font-weight: 800; }
    .case-copy h3 { margin: 6px 0; font-size: 18px; }
    .case-copy p { margin: 0; color: var(--muted); font-size: 14px; }
    .review-score { display: flex; align-items: center; gap: 22px; padding: 24px 28px; margin-bottom: 24px; background: var(--yellow); }
    .score-number { font-size: 42px; line-height: 1; font-weight: 850; }
    .stars { color: #3d381e; font-size: 20px; letter-spacing: 0; }
    .review-score p { margin: 4px 0 0; font-size: 13px; }
    .table-wrap { overflow-x: auto; border: 1px solid var(--line); }
    table { width: 100%; border-collapse: collapse; min-width: 720px; background: #fff; }
    th, td { padding: 14px 16px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
    th { background: #f4f2e7; font-size: 13px; }
    td { color: #4e534a; font-size: 14px; }
    td:first-child { color: var(--ink); font-weight: 700; }
    .fit { background: #fff9d9; color: #3f3817; }
    .fit-layout { display: grid; grid-template-columns: .9fr 1.1fr; gap: 40px; align-items: start; }
    .fit-list { margin: 0; padding: 0; list-style: none; }
    .fit-list li { padding: 14px 0; border-bottom: 1px solid #e5dfbd; }
    .fit-list strong { display: block; }
    .fit-list span { color: #68644e; font-size: 14px; }
    .token { background: #fff; }
    .token-panel { display: grid; grid-template-columns: 1.2fr .8fr; align-items: center; gap: 30px; padding: 30px; border-left: 5px solid var(--yellow); background: #f4f2e7; }
    .token-panel h3 { margin: 0 0 8px; font-size: 22px; }
    .token-panel p { margin: 0; color: var(--muted); }
    .token-note { padding-left: 24px; border-left: 1px solid #d8d5c8; color: var(--muted); font-size: 13px; }
    .reviews { background: #f4f2e7; }
    .review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: #dedccd; border: 1px solid #dedccd; }
    .review { padding: 21px; background: #fffdf7; }
    .review p { margin: 0 0 15px; color: #44483f; font-size: 14px; }
    .review strong { display: block; font-size: 13px; }
    .review span { color: var(--muted); font-size: 12px; }
    .faq-layout { display: grid; grid-template-columns: .65fr 1.35fr; gap: 48px; align-items: start; }
    .faq-list details { border-top: 1px solid var(--line); }
    .faq-list details:last-child { border-bottom: 1px solid var(--line); }
    .faq-list summary { position: relative; padding: 17px 35px 17px 0; cursor: pointer; font-weight: 700; list-style: none; }
    .faq-list summary::-webkit-details-marker { display: none; }
    .faq-list summary::after { content: "+"; position: absolute; right: 4px; font-size: 20px; font-weight: 400; }
    .faq-list details[open] summary::after { content: "−"; }
    .faq-list details p { margin: 0; padding: 0 24px 18px 0; color: var(--muted); font-size: 14px; }
    .articles { background: #f4f2e7; }
    .article-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
    .article { padding: 20px 0; border-top: 2px solid var(--yellow-dark); }
    .article small { color: #7a6500; font-weight: 700; }
    .article h3 { margin: 8px 0; font-size: 18px; }
    .article p { margin: 0; color: var(--muted); font-size: 14px; }
    .contact { padding: 76px 0; background: var(--yellow); }
    .contact-layout { display: grid; grid-template-columns: .85fr 1.15fr; gap: 50px; align-items: start; }
    .contact-copy p { max-width: 440px; color: #444536; }
    .contact-details { display: grid; gap: 8px; margin-top: 24px; font-size: 14px; }
    .contact-details a { text-decoration: underline; text-underline-offset: 3px; }
    .form { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; padding: 24px; background: #fffdf5; }
    .field { display: grid; gap: 6px; }
    .field-wide { grid-column: 1 / -1; }
    .field label { font-size: 13px; font-weight: 700; }
    .field input, .field select, .field textarea { width: 100%; border: 1px solid #d9d7ca; border-radius: 0; padding: 11px 12px; background: #fff; color: var(--ink); }
    .field textarea { min-height: 112px; resize: vertical; }
    .form .button { grid-column: 1 / -1; justify-self: start; cursor: pointer; }
    .footer { padding: 30px 0; background: #202820; color: #f3f3e9; }
    .footer-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 30px; }
    .footer p { margin: 5px 0; color: #d2d7cf; font-size: 13px; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 10px 18px; max-width: 520px; }
    .footer-links a { color: #f4d64e; font-size: 13px; }
    .copyright { margin-top: 20px !important; padding-top: 14px; border-top: 1px solid #485048; }
    .float-tools { position: fixed; right: 18px; bottom: 20px; z-index: 15; display: grid; gap: 8px; }
    .float-tools a, .float-tools button { display: grid; place-items: center; width: 46px; min-height: 46px; border: 1px solid #24281f; background: var(--yellow); color: var(--ink); cursor: pointer; font-size: 12px; font-weight: 800; }
    .float-tools a:last-child { background: #fff; }
    .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: 920px) {
      .menu-toggle { display: inline-grid; place-items: center; }
      .nav { position: relative; }
      .nav-links { display: none; position: absolute; top: 71px; left: 0; right: 0; padding: 12px; background: var(--paper); border: 1px solid var(--line); align-items: stretch; justify-content: flex-start; }
      .nav-links.open { display: grid; grid-template-columns: repeat(3, 1fr); }
      .nav-links a { padding: 10px; }
      .nav-actions { display: flex; align-items: center; gap: 9px; }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .about-layout, .network, .fit-layout, .faq-layout, .contact-layout { grid-template-columns: 1fr; gap: 30px; }
    }
    @media (max-width: 640px) {
      .container { width: min(var(--container), calc(100% - 32px)); }
      .nav { min-height: 64px; }
      .brand-name { font-size: 15px; }
      .ai-page-logo { width: 34px; }
      .nav-cta { min-height: 36px; padding-inline: 10px; font-size: 12px; }
      .nav-links { top: 63px; }
      .nav-links.open { grid-template-columns: repeat(2, 1fr); }
      .hero { padding: 55px 0 30px; }
      .hero-copy { font-size: 16px; }
      .hero-strip { grid-template-columns: repeat(2, 1fr); row-gap: 14px; }
      section { padding: 56px 0; }
      .section-head { align-items: flex-start; flex-direction: column; }
      .service-grid, .industry-grid, .case-grid, .review-grid, .article-grid { grid-template-columns: 1fr; }
      .service-item { min-height: 0; }
      .workflow { grid-template-columns: 1fr 1fr; }
      .step { padding-right: 10px; }
      .step:not(:last-child)::after { display: none; }
      .network-points { grid-template-columns: 1fr; gap: 10px; }
      .token-panel { grid-template-columns: 1fr; padding: 22px; }
      .token-note { padding: 15px 0 0; border-left: 0; border-top: 1px solid #d8d5c8; }
      .review-score { align-items: flex-start; flex-direction: column; gap: 8px; }
      .form { grid-template-columns: 1fr; padding: 18px; }
      .field-wide, .form .button { grid-column: auto; }
      .footer-top { flex-direction: column; }
      .float-tools { right: 10px; bottom: 12px; }
      .float-tools a, .float-tools button { width: 42px; min-height: 42px; }
    }