:root {
      color-scheme: light;
      --ink: #20221d;
      --muted: #62645c;
      --paper: #f5f4ef;
      --white: #fffefa;
      --line: #deded4;
      --yellow: #f4dc22;
      --yellow-deep: #d9bf00;
      --green: #36594b;
      --red: #aa4738;
      --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; }
    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(255,254,250,.96); border-bottom: 1px solid var(--line); }
    .header-inner { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
    .brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 800; white-space: nowrap; }
    .ai-page-logo { display: block; width: 42px; height: 42px; object-fit: contain; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; gap: 0; }
    .nav-links a { padding: 10px 9px; color: #484a43; font-size: 13px; text-decoration: none; white-space: nowrap; }
    .nav-links a:hover { color: #111; text-decoration: underline; text-decoration-color: var(--yellow-deep); text-underline-offset: 5px; }
    .menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); background: var(--white); color: var(--ink); cursor: pointer; }
    .button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 22px; border: 1px solid var(--ink); background: var(--ink); color: #fff; font-weight: 750; text-decoration: none; transition: transform .2s, background .2s, box-shadow .2s; }
    .button:hover { transform: translateY(-2px); box-shadow: 0 7px 0 rgba(32,34,29,.12); }
    .button-yellow { background: var(--yellow); color: var(--ink); border-color: var(--yellow); }
    .button-outline { background: transparent; color: var(--ink); }
    .hero { overflow: hidden; position: relative; padding: 75px 0 55px; border-bottom: 1px solid var(--line); background: var(--yellow); }
    .hero::after { content: ""; position: absolute; width: 350px; height: 350px; right: -90px; top: -175px; border: 1px solid rgba(32,34,29,.22); border-radius: 50%; box-shadow: 0 0 0 35px rgba(32,34,29,.035), 0 0 0 70px rgba(32,34,29,.025); pointer-events: none; }
    .hero-grid { display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(250px, .55fr); gap: 40px; align-items: center; }
    .eyebrow { margin: 0 0 16px; color: #45452f; font-size: 12px; font-weight: 800; letter-spacing: 0; text-transform: uppercase; }
    h1 { max-width: 760px; margin: 0; font-size: clamp(38px, 6vw, 72px); line-height: 1.06; letter-spacing: 0; }
    .hero-copy { max-width: 650px; margin: 22px 0 28px; color: #38392f; font-size: 17px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
    .hero-note { position: relative; z-index: 1; padding: 24px; border: 1px solid rgba(32,34,29,.35); background: rgba(255,254,250,.48); }
    .hero-note strong { display: block; margin-bottom: 9px; font-size: 18px; }
    .hero-note p { margin: 0; color: #48483d; font-size: 14px; }
    .hero-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-top: 52px; border: 1px solid rgba(32,34,29,.25); background: rgba(32,34,29,.25); }
    .hero-stat { padding: 18px 20px; background: rgba(255,254,250,.55); }
    .hero-stat strong { display: block; font-size: 19px; }
    .hero-stat span { color: #55564a; font-size: 13px; }
    section { padding: 70px 0; }
    .section-head { display: flex; justify-content: space-between; align-items: end; gap: 24px; margin-bottom: 30px; }
    .section-head h2 { margin: 0; font-size: clamp(27px, 4vw, 40px); line-height: 1.2; }
    .section-head p { max-width: 520px; margin: 0; color: var(--muted); }
    .section-kicker { display: block; margin-bottom: 10px; color: #787a6e; font-size: 12px; font-weight: 800; }
    .intro-band { background: var(--white); border-bottom: 1px solid var(--line); }
    .intro-layout { display: grid; grid-template-columns: .85fr 1.15fr; gap: 50px; align-items: start; }
    .intro-layout h2 { margin: 0 0 16px; font-size: 34px; line-height: 1.2; }
    .intro-layout p { margin: 0; color: var(--muted); }
    .intro-points { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 24px; margin: 0; padding: 0; list-style: none; }
    .intro-points li { padding: 15px 0; border-top: 1px solid var(--line); font-weight: 650; }
    .intro-points li span { display: block; margin-top: 4px; color: var(--muted); font-size: 13px; font-weight: 400; }
    .service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .service-item { min-height: 175px; padding: 22px; border: 1px solid var(--line); background: var(--white); transition: transform .2s, box-shadow .2s; }
    .service-item:hover { transform: translateY(-3px); box-shadow: 5px 5px 0 var(--yellow); }
    .service-item h3 { margin: 0 0 9px; font-size: 19px; }
    .service-item p { margin: 0; color: var(--muted); font-size: 14px; }
    .service-item small { display: inline-block; margin-top: 16px; color: var(--green); font-weight: 750; }
    .workflow { background: #e9ece4; }
    .steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: step; }
    .step { padding-top: 18px; border-top: 3px solid var(--green); }
    .step::before { counter-increment: step; content: "0" counter(step); color: var(--green); font-size: 13px; font-weight: 800; }
    .step h3 { margin: 12px 0 7px; font-size: 19px; }
    .step p { margin: 0; color: var(--muted); font-size: 14px; }
    .model-list { display: flex; flex-wrap: wrap; gap: 8px; }
    .model-list span { padding: 8px 12px; border: 1px solid var(--line); background: var(--white); color: #3e413a; font-size: 13px; }
    .solution-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
    .solution { padding: 23px; background: var(--white); }
    .solution h3 { margin: 0 0 8px; font-size: 18px; }
    .solution p { margin: 0; color: var(--muted); font-size: 14px; }
    .price-strip { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 20px; align-items: center; padding: 28px; background: var(--ink); color: #fff; }
    .price-strip h2 { margin: 0; font-size: 26px; }
    .price-strip p { margin: 0; color: #e2e3dc; font-size: 14px; }
    .price-strip .button { justify-self: end; background: var(--yellow); color: var(--ink); border-color: var(--yellow); }
    .process-line { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
    .process-line div { padding: 20px 18px; border-right: 1px solid var(--line); }
    .process-line div:last-child { border-right: 0; }
    .process-line strong { display: block; margin-bottom: 5px; }
    .process-line span { color: var(--muted); font-size: 13px; }
    .showcase { background: #fffefa; }
    .image-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .image-frame { overflow: hidden; border: 1px solid var(--line); background: #eeede7; }
    .image-frame img { display: block; width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
    .image-frame figcaption { padding: 12px 14px; font-size: 14px; font-weight: 700; }
    .comparison-wrap { overflow-x: auto; border: 1px solid var(--line); background: var(--white); }
    table { width: 100%; border-collapse: collapse; min-width: 720px; text-align: left; }
    th, td { padding: 15px 17px; border-bottom: 1px solid var(--line); vertical-align: top; }
    thead th { background: var(--ink); color: #fff; }
    tbody th { width: 22%; background: #f0f0e9; }
    .rating { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; margin-bottom: 22px; }
    .rating strong { font-size: 30px; }
    .stars { color: #b39a00; font-size: 22px; letter-spacing: 0; }
    .rating span:last-child { color: var(--muted); }
    .testimonials { background: #e9ece4; }
    .quote-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
    blockquote { margin: 0; padding: 20px; border-left: 3px solid var(--yellow-deep); background: var(--white); }
    blockquote p { margin: 0 0 16px; color: #45473f; font-size: 14px; }
    blockquote footer { color: var(--muted); font-size: 13px; font-weight: 700; }
    .faq-list { border-top: 1px solid var(--line); }
    details { border-bottom: 1px solid var(--line); background: var(--white); }
    summary { position: relative; padding: 18px 48px 18px 18px; cursor: pointer; font-weight: 700; list-style: none; }
    summary::-webkit-details-marker { display: none; }
    summary::after { content: "+"; position: absolute; right: 18px; top: 14px; font-size: 23px; font-weight: 400; }
    details[open] summary::after { content: "−"; }
    details p { margin: 0; padding: 0 18px 18px; color: var(--muted); }
    .articles { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0 22px; border-top: 1px solid var(--line); }
    .articles a { display: block; padding: 17px 0; border-bottom: 1px solid var(--line); text-decoration: none; font-weight: 700; }
    .articles a:hover { color: #716100; }
    .contact { background: var(--yellow); }
    .contact-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 48px; align-items: start; }
    .contact-info h2 { margin: 0 0 14px; font-size: 36px; line-height: 1.2; }
    .contact-info p { color: #48483d; }
    .contact-info a { font-weight: 700; }
    .contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; padding: 24px; border: 1px solid rgba(32,34,29,.3); background: var(--white); }
    .field { display: flex; flex-direction: column; gap: 6px; }
    .field-full { grid-column: 1 / -1; }
    .field label { font-size: 13px; font-weight: 700; }
    .field input, .field select, .field textarea { width: 100%; min-height: 44px; padding: 10px 12px; border: 1px solid #c9c9bd; border-radius: 0; background: #fff; color: var(--ink); }
    .field textarea { min-height: 110px; resize: vertical; }
    .contact-form button { justify-self: start; }
    .footer { padding: 28px 0; background: var(--ink); color: #f6f5ee; }
    .footer-top { display: flex; justify-content: space-between; gap: 24px; align-items: start; }
    .footer p { margin: 0; color: #d3d5cc; font-size: 13px; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 8px 18px; }
    .footer-links a { color: #f6f5ee; font-size: 13px; }
    .footer-bottom { margin-top: 18px; padding-top: 15px; border-top: 1px solid #55574f; color: #d3d5cc; font-size: 12px; }
    .floating { position: fixed; z-index: 15; right: 18px; bottom: 18px; }
    .floating details { position: relative; border: 1px solid var(--ink); box-shadow: 3px 3px 0 var(--yellow-deep); }
    .floating summary { padding: 12px 16px; background: var(--white); font-size: 13px; }
    .floating summary::after { display: none; }
    .qr-panel { position: absolute; right: 0; bottom: calc(100% + 8px); width: 190px; padding: 12px; border: 1px solid var(--line); background: var(--white); text-align: center; }
    .qr-panel img { display: block; width: 100%; aspect-ratio: 1; object-fit: contain; }
    .qr-panel p { margin: 7px 0 0; font-size: 12px; }
    .back-top { position: fixed; right: 20px; bottom: 80px; display: none; width: 42px; height: 42px; border: 1px solid var(--ink); background: var(--white); color: var(--ink); cursor: pointer; }
    .back-top.visible { display: block; }
    .reveal { opacity: 0; transform: translateY(12px); transition: opacity .5s ease, transform .5s ease; }
    .reveal.in-view { opacity: 1; transform: none; }
    @media (max-width: 980px) {
      .header-inner { flex-wrap: wrap; padding: 12px 0; }
      .menu-toggle { display: block; margin-left: auto; }
      .header-cta { display: none; }
      .nav-links { display: none; flex: 0 0 100%; justify-content: flex-start; flex-wrap: wrap; padding: 8px 0; border-top: 1px solid var(--line); }
      .nav-links.open { display: flex; }
      .nav-links a { padding: 9px 12px 9px 0; }
      .hero-grid { grid-template-columns: 1fr; }
      .hero-note { max-width: 560px; }
      .service-grid, .solution-grid { grid-template-columns: repeat(2, 1fr); }
      .quote-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 650px) {
      .container { width: min(var(--container), calc(100% - 30px)); }
      .hero { padding: 55px 0 35px; }
      .hero-grid, .intro-layout, .contact-layout { grid-template-columns: 1fr; gap: 28px; }
      .hero-stats { grid-template-columns: 1fr; margin-top: 34px; }
      .hero-stat { padding: 13px 16px; }
      section { padding: 52px 0; }
      .section-head { display: block; }
      .section-head p { margin-top: 12px; }
      .intro-points, .service-grid, .solution-grid, .steps, .image-grid, .quote-grid, .articles { grid-template-columns: 1fr; }
      .service-item { min-height: 0; }
      .price-strip { grid-template-columns: 1fr; padding: 23px; }
      .price-strip .button { justify-self: start; }
      .process-line { grid-template-columns: 1fr 1fr; }
      .process-line div:nth-child(2) { border-right: 0; }
      .process-line div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
      .contact-form { grid-template-columns: 1fr; padding: 18px; }
      .field-full { grid-column: auto; }
      .footer-top { flex-direction: column; }
      .floating { right: 12px; bottom: 12px; }
      .back-top { right: 14px; bottom: 72px; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
    }