:root {
      color-scheme: light;
      --red: #c91e2b;
      --red-dark: #a81725;
      --red-pale: #fff0ef;
      --ink: #211f20;
      --muted: #686366;
      --line: #e9e1df;
      --paper: #fffdfb;
      --soft: #f7f2ef;
      --green: #286c56;
      --container: 1160px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans 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; }
    .container { width: min(var(--container), calc(100% - 40px)); margin-inline: auto; }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(255,253,251,.96);
      border-bottom: 1px solid rgba(233,225,223,.9);
      backdrop-filter: blur(12px);
    }
    .header-inner { min-height: 76px; 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 { max-width: 100%; height: auto; width: 42px; max-height: 42px; object-fit: contain; }
    .brand-name { font-weight: 800; font-size: 18px; letter-spacing: 0; }
    .nav { display: flex; align-items: center; gap: 20px; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; gap: 0; flex-wrap: wrap; }
    .nav-links a { padding: 8px 7px; color: #514b4c; font-size: 13px; white-space: nowrap; }
    .nav-links a:hover { color: var(--red); }
    .nav-cta, .button {
      display: inline-flex; align-items: center; justify-content: center; gap: 8px;
      border: 1px solid var(--red); border-radius: 4px; background: var(--red);
      color: #fff; font-weight: 700; padding: 11px 17px; transition: .2s ease;
      cursor: pointer;
    }
    .nav-cta { white-space: nowrap; font-size: 13px; padding: 10px 14px; }
    .button:hover, .nav-cta:hover { background: var(--red-dark); border-color: var(--red-dark); transform: translateY(-2px); }
    .button-outline { color: var(--red); background: transparent; }
    .button-outline:hover { color: #fff; }
    .menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 4px; background: white; color: var(--ink); cursor: pointer; }
    .hero {
      overflow: hidden; position: relative; padding: 76px 0 65px;
      background: linear-gradient(115deg, #fff8f5 0%, #fff 54%, #fff0ed 100%);
      border-bottom: 1px solid #f2e5e1;
    }
    .hero::before {
      content: ""; position: absolute; right: max(4%, calc((100vw - var(--container))/2));
      top: 48px; width: 310px; height: 310px;
      border: 1px solid rgba(201,30,43,.17); border-radius: 50%;
      box-shadow: 0 0 0 30px rgba(201,30,43,.035), 0 0 0 62px rgba(201,30,43,.025);
      pointer-events: none;
    }
    .hero::after { content: ""; position: absolute; right: 15%; top: 155px; width: 9px; height: 9px; background: var(--red); border-radius: 50%; box-shadow: 50px 62px 0 #e99a78, -72px 105px 0 #d74b51; }
    .hero-content { position: relative; z-index: 1; max-width: 720px; }
    .eyebrow { display: inline-flex; align-items: center; gap: 9px; color: var(--red); font-size: 13px; font-weight: 800; }
    .eyebrow::before { content: ""; width: 24px; height: 2px; background: currentColor; }
    h1 { max-width: 680px; margin: 17px 0 18px; font-size: clamp(38px, 5.2vw, 64px); line-height: 1.12; letter-spacing: 0; }
    .hero p { max-width: 640px; color: #585254; font-size: 17px; margin: 0; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
    .hero-note { margin-top: 19px; color: #71696a; font-size: 13px; }
    .hero-note strong { color: var(--red-dark); }
    .hero-bottom { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; margin-top: 58px; border-top: 1px solid #eadbd7; }
    .metric { padding: 20px 18px 0 0; }
    .metric + .metric { border-left: 1px solid #eadbd7; padding-left: 22px; }
    .metric strong { display: block; color: var(--red-dark); font-size: 17px; }
    .metric span { color: var(--muted); font-size: 13px; }
    section { scroll-margin-top: 88px; }
    .section { padding: 74px 0; }
    .section-tint { background: var(--soft); }
    .section-head { display: flex; align-items: end; justify-content: space-between; gap: 28px; margin-bottom: 30px; }
    .section-head > div { max-width: 720px; }
    .kicker { color: var(--red); font-size: 12px; font-weight: 800; text-transform: uppercase; letter-spacing: 0; }
    h2 { margin: 7px 0 8px; font-size: clamp(27px, 3vw, 38px); line-height: 1.2; letter-spacing: 0; }
    .section-head p, .intro-copy { color: var(--muted); margin: 0; }
    .text-link { color: var(--red-dark); font-size: 14px; font-weight: 700; white-space: nowrap; }
    .about-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: start; }
    .about-copy p { color: #5f5859; margin: 0 0 16px; }
    .capability-list { display: grid; grid-template-columns: repeat(2,1fr); gap: 0 24px; border-top: 1px solid var(--line); }
    .capability-list div { padding: 15px 0; border-bottom: 1px solid var(--line); }
    .capability-list strong { display: block; font-size: 14px; }
    .capability-list span { display: block; color: var(--muted); font-size: 13px; margin-top: 3px; }
    .tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
    .tag { padding: 6px 10px; color: #5b3032; background: #fff0ee; border: 1px solid #f2d5d1; font-size: 12px; border-radius: 3px; }
    .service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
    .service-item { min-width: 0; padding: 23px; background: #fff; transition: background .2s ease, transform .2s ease; }
    .service-item:hover { background: #fff9f7; transform: translateY(-3px); }
    .service-no { color: var(--red); font-size: 12px; font-weight: 800; }
    .service-item h3 { margin: 8px 0 6px; font-size: 17px; }
    .service-item p { color: var(--muted); margin: 0; font-size: 14px; }
    .workflow-band { display: grid; grid-template-columns: 1fr 1.2fr; gap: 48px; align-items: center; }
    .workflow-band p { color: var(--muted); }
    .steps { display: grid; grid-template-columns: repeat(4,1fr); gap: 0; }
    .step { position: relative; padding: 0 16px 0 0; }
    .step:not(:last-child)::after { content: ""; position: absolute; top: 16px; left: 42px; right: 6px; height: 1px; background: #e8c7c2; }
    .step-num { position: relative; z-index: 1; display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; color: white; background: var(--red); font-size: 13px; font-weight: 800; }
    .step h3 { margin: 13px 0 5px; font-size: 15px; }
    .step p { color: var(--muted); font-size: 13px; margin: 0; }
    .solutions { display: grid; grid-template-columns: repeat(3,1fr); gap: 26px; }
    .solution { padding-top: 15px; border-top: 2px solid var(--red); }
    .solution h3 { margin: 0 0 8px; font-size: 17px; }
    .solution p { color: var(--muted); font-size: 14px; margin: 0; }
    .network { display: grid; grid-template-columns: .8fr 1.2fr; gap: 40px; align-items: start; }
    .network-note { padding: 22px 24px; border-left: 3px solid var(--red); background: #fff; }
    .network-note h3 { margin: 0 0 8px; }
    .network-note p { margin: 0; color: var(--muted); font-size: 14px; }
    .model-cloud { display: flex; flex-wrap: wrap; gap: 9px; }
    .model-cloud span { padding: 8px 11px; background: white; border: 1px solid var(--line); border-radius: 3px; font-size: 13px; }
    .review-score { display: flex; align-items: center; gap: 18px; padding: 21px 24px; background: var(--red); color: white; border-radius: 4px; }
    .review-score strong { font-size: 38px; line-height: 1; }
    .stars { color: #ffe29a; letter-spacing: 0; font-size: 18px; }
    .review-score span { display: block; font-size: 13px; opacity: .92; }
    .comparison { width: 100%; border-collapse: collapse; background: white; font-size: 14px; }
    .comparison th, .comparison td { padding: 14px 15px; border: 1px solid var(--line); text-align: left; vertical-align: top; }
    .comparison th { background: #f7e9e6; font-weight: 800; }
    .comparison th:nth-child(2) { color: var(--red-dark); }
    .table-wrap { overflow-x: auto; border: 1px solid var(--line); }
    .table-wrap table { min-width: 680px; }
    .check { color: var(--green); font-weight: 800; }
    .price-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 42px; align-items: center; }
    .price-points { display: grid; gap: 13px; }
    .price-point { display: flex; gap: 13px; align-items: flex-start; }
    .price-mark { flex: 0 0 24px; width: 24px; height: 24px; display: grid; place-items: center; color: var(--red); border: 1px solid #e6bab5; border-radius: 50%; font-size: 13px; }
    .price-point strong { display: block; font-size: 14px; }
    .price-point span { color: var(--muted); font-size: 13px; }
    .price-panel { padding: 25px; background: #fff; border: 1px solid var(--line); }
    .price-panel h3 { margin: 0 0 8px; }
    .price-panel p { margin: 0 0 16px; color: var(--muted); font-size: 14px; }
    .quote { padding: 20px 0; border-bottom: 1px solid var(--line); }
    .quote:last-child { border-bottom: 0; }
    .quote p { margin: 0 0 9px; color: #51494a; font-size: 14px; }
    .quote strong { font-size: 13px; }
    .quote span { color: var(--muted); font-size: 12px; margin-left: 8px; }
    .review-grid { display: grid; grid-template-columns: repeat(3,1fr); column-gap: 28px; }
    .case-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; }
    .case { padding: 20px; background: white; border: 1px solid var(--line); }
    .case-label { color: var(--red); font-size: 12px; font-weight: 800; }
    .case h3 { margin: 7px 0; font-size: 17px; }
    .case p { margin: 0; color: var(--muted); font-size: 14px; }
    .article-list { border-top: 1px solid var(--line); }
    .article-row { display: flex; justify-content: space-between; gap: 24px; padding: 16px 3px; border-bottom: 1px solid var(--line); }
    .article-row a { font-weight: 700; }
    .article-row span { color: var(--muted); font-size: 13px; white-space: nowrap; }
    .faq-list { border-top: 1px solid var(--line); }
    details { border-bottom: 1px solid var(--line); }
    summary { position: relative; list-style: none; cursor: pointer; padding: 17px 34px 17px 0; font-weight: 700; }
    summary::-webkit-details-marker { display: none; }
    summary::after { content: "+"; position: absolute; right: 3px; top: 14px; color: var(--red); font-size: 21px; font-weight: 400; }
    details[open] summary::after { content: "−"; }
    details p { max-width: 850px; margin: -4px 0 17px; padding-right: 24px; color: var(--muted); font-size: 14px; }
    .contact-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 48px; align-items: start; }
    .contact-info h3 { margin: 0 0 10px; }
    .contact-info p { color: var(--muted); font-size: 14px; }
    .contact-links { display: grid; gap: 9px; margin-top: 22px; }
    .contact-links a { color: var(--red-dark); font-weight: 700; font-size: 14px; }
    .contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; padding: 24px; background: #fff; border: 1px solid var(--line); }
    .field { display: grid; gap: 6px; }
    .field-full { grid-column: 1 / -1; }
    label { font-size: 13px; font-weight: 700; }
    input, select, textarea { width: 100%; border: 1px solid #dcd3d1; background: #fff; color: var(--ink); border-radius: 3px; padding: 11px 12px; outline: none; }
    input:focus, select:focus, textarea:focus { border-color: var(--red); box-shadow: 0 0 0 3px rgba(201,30,43,.09); }
    textarea { resize: vertical; min-height: 112px; }
    .form-note { grid-column: 1 / -1; margin: -4px 0 0; color: var(--muted); font-size: 12px; }
    .join-band { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding: 25px 28px; background: #fff1ee; border: 1px solid #f0d2cd; }
    .join-band h3 { margin: 0 0 4px; }
    .join-band p { margin: 0; color: var(--muted); font-size: 14px; }
    .friend-links { display: flex; flex-wrap: wrap; gap: 10px 18px; padding: 22px 0; border-bottom: 1px solid var(--line); }
    .friend-links a { color: #5e5556; font-size: 13px; }
    .friend-links a:hover { color: var(--red); }
    .footer { background: #f7f2ef; color: #3e3839; }
    .footer-main { display: flex; justify-content: space-between; gap: 30px; padding: 23px 0; }
    .footer-main p { margin: 4px 0 0; color: #6d6465; font-size: 13px; }
    .footer-meta { color: #6d6465; font-size: 12px; }
    .float-contact { position: fixed; right: 20px; bottom: 20px; z-index: 15; display: flex; flex-direction: column; gap: 8px; }
    .float-contact a { display: grid; place-items: center; min-width: 50px; min-height: 46px; padding: 0 12px; color: #fff; background: var(--red); border-radius: 4px; box-shadow: 0 5px 16px rgba(88,20,25,.18); font-size: 12px; font-weight: 700; }
    .float-contact a:hover { background: var(--red-dark); }
    .reveal { opacity: 0; transform: translateY(14px); transition: opacity .55s ease, transform .55s ease; }
    .reveal.is-visible { opacity: 1; transform: translateY(0); }
    @media (max-width: 980px) {
      .nav-links { position: absolute; display: none; top: 75px; left: 0; right: 0; padding: 14px 20px 18px; background: var(--paper); border-bottom: 1px solid var(--line); box-shadow: 0 10px 18px rgba(40,20,20,.07); }
      .nav-links.is-open { display: grid; grid-template-columns: repeat(3,1fr); }
      .nav-links a { padding: 10px 8px; }
      .menu-toggle { display: grid; place-items: center; }
      .nav { gap: 10px; }
      .header-inner { min-height: 70px; }
      .hero::before { right: -110px; }
      .service-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 700px) {
      .container { width: min(var(--container), calc(100% - 32px)); }
      .section { padding: 55px 0; }
      .hero { padding: 54px 0 42px; }
      .hero::before { top: 25px; right: -195px; width: 270px; height: 270px; opacity: .75; }
      .hero::after { display: none; }
      .hero p { font-size: 15px; }
      .hero-bottom { grid-template-columns: repeat(2,1fr); margin-top: 40px; }
      .metric { padding: 15px 10px 12px 0; }
      .metric + .metric { border-left: 0; padding-left: 0; }
      .metric:nth-child(even) { border-left: 1px solid #eadbd7; padding-left: 16px; }
      .metric:nth-child(n+3) { border-top: 1px solid #eadbd7; }
      .section-head { display: block; }
      .section-head .text-link { display: inline-block; margin-top: 14px; }
      .about-grid, .workflow-band, .network, .price-layout, .contact-grid { grid-template-columns: 1fr; gap: 26px; }
      .service-grid, .solutions, .case-grid { grid-template-columns: 1fr; }
      .service-item { padding: 19px; }
      .steps { grid-template-columns: repeat(2,1fr); gap: 24px 10px; }
      .step:nth-child(2)::after { display: none; }
      .review-grid { grid-template-columns: 1fr; }
      .review-score { margin-bottom: 9px; }
      .contact-form { padding: 18px; }
      .join-band { align-items: flex-start; flex-direction: column; }
      .footer-main { display: block; }
      .footer-meta { margin-top: 14px; }
      .float-contact { right: 10px; bottom: 12px; }
      .float-contact a { min-width: 44px; min-height: 42px; padding: 0 9px; }
      .article-row { gap: 10px; }
    }
    @media (max-width: 420px) {
      .nav-cta { padding: 9px 10px; font-size: 12px; }
      .brand-name { font-size: 16px; }
      .nav-links.is-open { grid-template-columns: repeat(2,1fr); }
      .contact-form { grid-template-columns: 1fr; }
      .field-full, .form-note { grid-column: auto; }
      .hero-actions .button { width: 100%; }
    }
    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
      .reveal { opacity: 1; transform: none; }
    }