:root {
      color-scheme: light;
      --ink: #29221f;
      --muted: #71645f;
      --red: #c92f28;
      --red-dark: #a91f1a;
      --coral: #ef654c;
      --pale: #fff2ed;
      --paper: #fffaf7;
      --line: #eadbd4;
      --green: #26745a;
      --blue: #345f79;
      --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: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      line-height: 1.65;
    }
    a { color: inherit; text-decoration: none; }
    button, input, select, textarea { font: inherit; }
    button, a { -webkit-tap-highlight-color: transparent; }
    img { max-width: 100%; }
    .container { width: min(var(--container), calc(100% - 40px)); margin-inline: auto; }
    .site-header {
      position: sticky; top: 0; z-index: 20;
      background: rgba(255,250,247,.96);
      border-bottom: 1px solid rgba(234,219,212,.9);
      backdrop-filter: blur(14px);
    }
    .nav-row { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
    .brand { display: flex; align-items: center; gap: 11px; flex: 0 0 auto; }
    .ai-page-logo { display: block; width: 42px; height: 42px; object-fit: contain; max-width:100%; }
    .brand-name { font-size: 18px; font-weight: 800; letter-spacing: 0; }
    .brand-caption { display: block; color: var(--muted); font-size: 11px; line-height: 1.2; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; gap: 0; flex-wrap: wrap; }
    .nav-links a { padding: 9px 10px; font-size: 13px; color: #534744; transition: color .2s ease; }
    .nav-links a:hover { color: var(--red); }
    .nav-cta, .button {
      display: inline-flex; align-items: center; justify-content: center; gap: 9px;
      min-height: 46px; padding: 0 19px; border: 1px solid var(--red);
      border-radius: 4px; background: var(--red); color: #fff;
      font-weight: 700; transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
    }
    .nav-cta { min-height: 40px; padding-inline: 15px; white-space: nowrap; font-size: 13px; }
    .button:hover, .nav-cta:hover { background: var(--red-dark); box-shadow: 0 8px 20px rgba(169,31,26,.18); transform: translateY(-2px); }
    .button.secondary { color: var(--red-dark); background: #fffaf7; border-color: #dfaaa0; }
    .button.secondary:hover { background: #fff0eb; }
    .menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 4px; color: var(--ink); background: #fff; cursor: pointer; }
    .hero {
      position: relative; overflow: hidden;
      padding: 84px 0 54px;
      background: linear-gradient(135deg, #fff0e9 0%, #fff9f5 52%, #fce6dc 100%);
      border-bottom: 1px solid #f0d8cf;
    }
    .hero::before {
      content: ""; position: absolute; top: -120px; right: max(4%, calc((100vw - var(--container))/2));
      width: 310px; aspect-ratio: 1; border: 1px solid rgba(201,47,40,.14);
      border-radius: 50%; box-shadow: 0 0 0 28px rgba(201,47,40,.035), 0 0 0 58px rgba(201,47,40,.025);
      pointer-events: none;
    }
    .hero-layout { position: relative; display: grid; grid-template-columns: minmax(0,1.3fr) minmax(270px,.7fr); gap: 46px; align-items: center; }
    .eyebrow { display: inline-flex; gap: 8px; align-items: center; color: var(--red-dark); font-size: 13px; font-weight: 800; }
    .eyebrow::before { content: ""; width: 22px; height: 2px; background: var(--red); }
    h1 { max-width: 720px; margin: 15px 0 18px; font-size: clamp(38px, 5vw, 64px); line-height: 1.12; letter-spacing: 0; }
    .hero h1 span { color: var(--red); }
    .hero-copy { max-width: 650px; color: #5f514c; font-size: 17px; }
    .hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 27px; }
    .hero-note { margin-top: 18px; color: var(--muted); font-size: 13px; }
    .hero-panel { position: relative; padding: 24px; border-left: 3px solid var(--red); background: rgba(255,255,255,.72); }
    .hero-panel h2 { margin: 0 0 16px; font-size: 18px; }
    .model-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
    .model-cloud span { padding: 6px 9px; color: #583e38; background: #fff3ed; border: 1px solid #f0d4ca; font-size: 12px; }
    .hero-panel-foot { margin: 16px 0 0; padding-top: 13px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
    .quick-stats { position: relative; display: grid; grid-template-columns: repeat(4,1fr); gap: 0; margin-top: 55px; border-top: 1px solid #e8c9be; }
    .stat { padding: 19px 20px 0 0; }
    .stat strong { display: block; color: var(--red-dark); font-size: 21px; line-height: 1.3; }
    .stat span { color: var(--muted); font-size: 13px; }
    section.content-section { padding: 76px 0; }
    .section-heading { max-width: 700px; margin-bottom: 30px; }
    .section-kicker { margin: 0 0 8px; color: var(--red); font-size: 12px; font-weight: 800; letter-spacing: 0; }
    h2.section-title { margin: 0; font-size: clamp(28px,3vw,40px); line-height: 1.2; }
    .section-intro { margin: 12px 0 0; color: var(--muted); }
    .intro-band { display: grid; grid-template-columns: .9fr 1.1fr; gap: 42px; align-items: start; padding: 32px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
    .intro-band h3 { margin: 0; font-size: 24px; line-height: 1.35; }
    .intro-band p { margin: 0; color: #5f514c; }
    .intro-points { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 17px; }
    .intro-points span { color: var(--red-dark); font-size: 13px; font-weight: 700; }
    .intro-points span + span::before { content: "·"; padding: 0 9px 0 0; color: #c9a69b; }
    .service-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
    .service-item { padding: 23px; background: #fffaf7; transition: background .2s ease; }
    .service-item:hover { background: #fff2ec; }
    .service-number { display: block; color: #c45445; font-size: 12px; font-weight: 800; }
    .service-item h3 { margin: 9px 0 7px; font-size: 18px; }
    .service-item p { margin: 0; color: var(--muted); font-size: 14px; }
    .service-label { display: inline-block; margin-top: 14px; padding: 4px 8px; color: #7b4037; background: #fae8e1; font-size: 11px; }
    .workflow-band { background: #f8e8e1; }
    .workflow { display: grid; grid-template-columns: repeat(4,1fr); gap: 20px; counter-reset: steps; }
    .step { position: relative; padding: 4px 18px 0 0; counter-increment: steps; }
    .step::before { content: "0" counter(steps); display: block; margin-bottom: 13px; color: var(--red); font-size: 14px; font-weight: 800; }
    .step:not(:last-child)::after { content: ""; position: absolute; top: 14px; left: 38px; right: 0; height: 1px; background: #d8aaa0; }
    .step h3 { margin: 0 0 7px; font-size: 17px; }
    .step p { margin: 0; color: var(--muted); font-size: 14px; }
    .solution-list { display: grid; grid-template-columns: repeat(2,1fr); gap: 0 38px; border-top: 1px solid var(--line); }
    .solution-row { display: grid; grid-template-columns: 112px 1fr; gap: 16px; align-items: start; padding: 19px 0; border-bottom: 1px solid var(--line); }
    .solution-row strong { color: var(--red-dark); }
    .solution-row span { color: var(--muted); font-size: 14px; }
    .network { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
    .network-copy p { color: var(--muted); }
    .network-list { display: grid; grid-template-columns: repeat(2,1fr); gap: 0 18px; margin: 20px 0 0; padding: 0; list-style: none; }
    .network-list li { padding: 10px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
    .network-mark { padding: 25px 26px; background: #fff0e9; border-top: 3px solid var(--red); }
    .network-mark strong { display: block; color: var(--red-dark); font-size: 23px; line-height: 1.3; }
    .network-mark p { margin-bottom: 0; color: #63534d; font-size: 14px; }
    .case-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
    .case { overflow: hidden; background: #fff; border: 1px solid var(--line); }
    .case-media { display: block; aspect-ratio: 16/9; overflow: hidden; background: #f4e5de; }
    .case-media img { display: block; width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
    .case:hover .case-media img { transform: scale(1.035); }
    .case-body { padding: 17px 18px 20px; }
    .case-body h3 { margin: 0 0 6px; font-size: 17px; }
    .case-body p { margin: 0; color: var(--muted); font-size: 14px; }
    .rating-layout { display: grid; grid-template-columns: .75fr 1.25fr; gap: 40px; align-items: start; }
    .rating-callout { padding: 25px 0; border-top: 3px solid var(--red); border-bottom: 1px solid var(--line); }
    .stars { color: #c33b2e; font-size: 20px; letter-spacing: 0; }
    .score { margin: 8px 0 0; color: var(--red-dark); font-size: 48px; font-weight: 800; line-height: 1; }
    .score small { color: var(--muted); font-size: 17px; font-weight: 500; }
    .rating-callout p { color: var(--muted); font-size: 14px; }
    .table-wrap { overflow-x: auto; border: 1px solid var(--line); background: #fff; }
    table { width: 100%; border-collapse: collapse; text-align: left; }
    th, td { padding: 13px 14px; border-bottom: 1px solid #eee2dc; vertical-align: top; font-size: 13px; }
    th { color: #513d37; background: #fff0e9; font-size: 12px; }
    td:first-child { font-weight: 700; white-space: nowrap; }
    td:last-child { color: var(--green); font-weight: 700; }
    .price-strip { display: grid; grid-template-columns: 1fr 1fr 1fr; border-block: 1px solid var(--line); }
    .price-item { padding: 22px 22px 22px 0; }
    .price-item + .price-item { padding-left: 22px; border-left: 1px solid var(--line); }
    .price-item h3 { margin: 0 0 5px; font-size: 17px; }
    .price-item p { margin: 0; color: var(--muted); font-size: 14px; }
    .price-caution { margin: 13px 0 0; color: var(--muted); font-size: 12px; }
    .testimonial-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
    .testimonial { padding: 20px; border-top: 2px solid #d74b3b; background: #fff; }
    .testimonial p { margin: 0 0 17px; color: #514541; font-size: 14px; }
    .testimonial strong { display: block; font-size: 13px; }
    .testimonial span { color: var(--muted); font-size: 12px; }
    .articles { display: grid; grid-template-columns: repeat(5,1fr); gap: 12px; }
    .article-link { min-height: 95px; display: flex; flex-direction: column; justify-content: space-between; padding: 15px; border: 1px solid var(--line); background: #fff; transition: border-color .2s ease, transform .2s ease; }
    .article-link:hover { transform: translateY(-3px); border-color: #d27465; }
    .article-link span { color: var(--red); font-size: 11px; font-weight: 800; }
    .article-link strong { font-size: 14px; }
    .faq-list { border-top: 1px solid var(--line); }
    .faq-item { border-bottom: 1px solid var(--line); }
    .faq-item summary { position: relative; padding: 17px 35px 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(--red); font-size: 22px; font-weight: 400; }
    .faq-item[open] summary::after { content: "−"; }
    .faq-item p { max-width: 850px; margin: 0 0 17px; color: var(--muted); font-size: 14px; }
    .knowledge { display: flex; flex-wrap: wrap; gap: 9px; }
    .knowledge a { padding: 8px 12px; border: 1px solid #e7cfc6; color: #663d36; background: #fff5f0; font-size: 13px; transition: background .2s ease; }
    .knowledge a:hover { background: #f9e2d9; }
    .form-section { background: #f8e8e1; }
    .contact-layout { display: grid; grid-template-columns: .72fr 1.28fr; gap: 46px; align-items: start; }
    .contact-info p { color: var(--muted); }
    .contact-lines { margin-top: 20px; }
    .contact-lines div { padding: 9px 0; border-bottom: 1px solid #e4c9bf; font-size: 14px; }
    .contact-lines strong { display: inline-block; min-width: 110px; }
    .contact-form { display: grid; grid-template-columns: repeat(2,1fr); gap: 15px; padding: 22px; background: #fffaf7; border: 1px solid #ecd5cc; }
    .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 11px; color: var(--ink); border: 1px solid #dac9c1; border-radius: 2px; background: #fff; outline: none; }
    .field textarea { min-height: 112px; resize: vertical; }
    .field input:focus, .field select:focus, .field textarea:focus { border-color: var(--red); box-shadow: 0 0 0 3px rgba(201,47,40,.1); }
    .contact-form .button { justify-self: start; cursor: pointer; }
    .join-band { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 28px 0 0; }
    .join-band h3 { margin: 0; font-size: 20px; }
    .join-band p { margin: 5px 0 0; color: var(--muted); font-size: 14px; }
    .site-footer { padding: 30px 0 25px; color: #392f2c; background: #f4e8e2; border-top: 1px solid #e5d1c8; }
    .footer-top { display: flex; justify-content: space-between; align-items: center; gap: 22px; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 8px 20px; color: #574743; font-size: 13px; }
    .footer-links a:hover { color: var(--red-dark); }
    .footer-bottom { margin-top: 19px; padding-top: 14px; border-top: 1px solid #dfccc4; color: #75645d; font-size: 12px; }
    .friend-links { display: flex; flex-wrap: wrap; gap: 7px 16px; margin-top: 12px; }
    .friend-links a { color: #574743; }
    .floating-tools { position: fixed; right: 16px; bottom: 20px; z-index: 15; display: grid; gap: 8px; }
    .float-link { display: grid; place-items: center; width: 46px; height: 46px; color: #fff; background: var(--red); border: 0; border-radius: 50%; box-shadow: 0 5px 15px rgba(95,35,28,.2); font-size: 12px; font-weight: 700; cursor: pointer; }
    .float-link:hover { background: var(--red-dark); }
    .qr-pop { position: absolute; right: 56px; bottom: 55px; width: 190px; padding: 12px; background: #fff; border: 1px solid var(--line); box-shadow: 0 8px 30px rgba(40,20,15,.15); visibility: hidden; opacity: 0; transform: translateY(6px); transition: .2s ease; }
    .qr-pop img { display: block; width: 100%; height: auto; }
    .qr-pop span { display: block; padding-top: 7px; text-align: center; font-size: 12px; }
    .float-wrap:hover .qr-pop, .float-wrap:focus-within .qr-pop { visibility: visible; opacity: 1; transform: none; }
    .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; transition-duration: .01ms !important; animation-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 { display: none; }
      .hero-layout { gap: 28px; }
      .service-grid { grid-template-columns: repeat(2,1fr); }
      .articles { grid-template-columns: repeat(3,1fr); }
    }
    @media (max-width: 720px) {
      .container { width: min(var(--container), calc(100% - 32px)); }
      .nav-row { min-height: 64px; }
      .menu-toggle { display: inline-grid; place-items: center; }
      .nav-links { display: none; position: absolute; top: 64px; left: 0; right: 0; padding: 10px 16px 15px; background: #fffaf7; border-bottom: 1px solid var(--line); box-shadow: 0 10px 15px rgba(40,20,15,.06); }
      .nav-links.is-open { display: grid; grid-template-columns: repeat(2,1fr); }
      .nav-links a { padding: 10px; font-size: 14px; }
      .hero { padding: 58px 0 36px; }
      .hero-layout { grid-template-columns: 1fr; gap: 27px; }
      .hero::before { right: -170px; top: -130px; }
      h1 { font-size: 42px; }
      .hero-copy { font-size: 15px; }
      .quick-stats { grid-template-columns: repeat(2,1fr); margin-top: 34px; }
      .stat { padding: 14px 10px 0 0; }
      section.content-section { padding: 56px 0; }
      .intro-band, .network, .rating-layout, .contact-layout { grid-template-columns: 1fr; gap: 24px; }
      .service-grid { grid-template-columns: 1fr; }
      .workflow { grid-template-columns: repeat(2,1fr); row-gap: 27px; }
      .step:nth-child(2)::after { display: none; }
      .solution-list { grid-template-columns: 1fr; }
      .case-grid, .testimonial-grid { grid-template-columns: 1fr; }
      .case-media { aspect-ratio: 16/8; }
      .articles { grid-template-columns: repeat(2,1fr); }
      .price-strip { grid-template-columns: 1fr; }
      .price-item, .price-item + .price-item { padding: 16px 0; border-left: 0; }
      .price-item + .price-item { border-top: 1px solid var(--line); }
      .footer-top { align-items: flex-start; flex-direction: column; }
      .join-band { align-items: flex-start; flex-direction: column; }
    }
    @media (max-width: 420px) {
      .brand-caption { display: none; }
      .hero-actions .button { width: 100%; }
      .workflow { grid-template-columns: 1fr; }
      .step::after { display: none; }
      .solution-row { grid-template-columns: 93px 1fr; gap: 11px; }
      .network-list { grid-template-columns: 1fr; }
      .articles { grid-template-columns: 1fr 1fr; gap: 8px; }
      .article-link { min-height: 90px; padding: 11px; }
      .contact-form { grid-template-columns: 1fr; padding: 16px; }
      .field.full { grid-column: auto; }
    }