:root {
      --red: #d62f3d;
      --red-deep: #a8172c;
      --ink: #202631;
      --muted: #657080;
      --paper: #fffaf7;
      --white: #ffffff;
      --line: #eaded8;
      --gold: #d79c36;
      --teal: #177f83;
      --blue: #263f69;
      --shadow: 0 18px 45px rgba(92, 40, 34, .10);
      --radius: 8px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      line-height: 1.7;
    }
    a { color: inherit; text-decoration: none; }
    img { max-width: 100%; height: auto; display: block; }
    .container { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(255, 250, 247, .94);
      border-bottom: 1px solid rgba(234, 222, 216, .9);
      backdrop-filter: blur(14px);
    }
    .nav-bar {
      min-height: 76px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }
    .brand { display: flex; align-items: center; gap: 12px; flex: 0 0 auto; }
    .ai-page-logo { width: 136px; }
    .brand-copy { border-left: 1px solid var(--line); padding-left: 12px; font-size: 12px; color: var(--muted); line-height: 1.35; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; gap: 0; flex-wrap: wrap; }
    .nav-links a {
      padding: 8px 10px;
      color: #4d5662;
      font-size: 13px;
      transition: color .2s ease, background .2s ease;
    }
    .nav-links a:hover { color: var(--red); background: #fff0ed; }
    .nav-cta, .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border: 0;
      border-radius: 5px;
      padding: 12px 19px;
      font-weight: 700;
      cursor: pointer;
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    }
    .nav-cta, .btn-primary { color: #fff; background: var(--red); box-shadow: 0 9px 20px rgba(214, 47, 61, .22); }
    .nav-cta:hover, .btn-primary:hover { transform: translateY(-2px); background: var(--red-deep); }
    .menu-toggle { display: none; border: 1px solid var(--line); background: var(--white); color: var(--ink); padding: 8px 10px; border-radius: 5px; font-size: 20px; }
    .hero {
      position: relative;
      overflow: hidden;
      background: linear-gradient(135deg, #fff7f2 0%, #ffe8e1 54%, #fffaf7 100%);
      border-bottom: 1px solid var(--line);
    }
    .hero::after {
      content: "";
      position: absolute;
      width: 380px;
      height: 380px;
      right: -120px;
      top: -140px;
      border: 1px solid rgba(214, 47, 61, .18);
      border-radius: 50%;
      box-shadow: 0 0 0 28px rgba(214, 47, 61, .04), 0 0 0 56px rgba(214, 47, 61, .025);
    }
    .hero-inner { position: relative; z-index: 1; padding: 82px 0 68px; }
    .eyebrow { color: var(--red-deep); font-weight: 800; letter-spacing: .12em; font-size: 13px; }
    h1, h2, h3, p { margin-top: 0; }
    h1 { max-width: 760px; margin: 14px 0 20px; font-size: clamp(36px, 6vw, 68px); line-height: 1.15; letter-spacing: 0; }
    .hero-lead { max-width: 720px; color: #535d69; font-size: 18px; }
    .hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin: 30px 0 42px; }
    .btn-secondary { color: var(--red-deep); background: var(--white); border: 1px solid #e6b9b1; }
    .btn-secondary:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
    .hero-metrics { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); max-width: 900px; border-top: 1px solid #e5c8c1; }
    .metric { padding: 20px 22px 0 0; border-right: 1px solid #e5c8c1; margin-right: 22px; }
    .metric:last-child { border-right: 0; margin-right: 0; }
    .metric strong { display: block; color: var(--red-deep); font-size: 27px; line-height: 1.2; }
    .metric span { color: var(--muted); font-size: 13px; }
    section { padding: 90px 0; }
    .section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 36px; }
    .section-head h2 { margin-bottom: 8px; font-size: clamp(28px, 4vw, 43px); line-height: 1.2; }
    .section-head p { max-width: 610px; color: var(--muted); margin-bottom: 0; }
    .section-kicker { color: var(--red); font-size: 13px; font-weight: 800; letter-spacing: .1em; }
    .about-band { background: #fff; }
    .about-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 54px; align-items: start; }
    .about-copy p { color: var(--muted); font-size: 16px; }
    .principles { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; margin-top: 26px; }
    .principle { padding: 18px; border-left: 3px solid var(--red); background: #fff6f3; }
    .principle strong { display: block; margin-bottom: 4px; }
    .principle span { color: var(--muted); font-size: 13px; }
    .network-box { padding: 28px; background: var(--blue); color: #fff; border-radius: var(--radius); box-shadow: var(--shadow); }
    .network-box h3 { margin-bottom: 14px; font-size: 24px; }
    .network-box p { color: #dce5f2; font-size: 14px; }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
    .tag { display: inline-block; padding: 6px 10px; border: 1px solid rgba(255,255,255,.28); color: #fff; font-size: 12px; border-radius: 20px; }
    .services { background: #fff7f2; }
    .service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .service-card { padding: 25px; background: #fff; border: 1px solid var(--line); border-top: 3px solid var(--red); border-radius: var(--radius); transition: transform .25s ease, box-shadow .25s ease; }
    .service-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
    .service-no { color: var(--gold); font-weight: 800; font-size: 13px; }
    .service-card h3 { margin: 10px 0 8px; font-size: 20px; }
    .service-card p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .workflow { background: #fff; }
    .steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; border-top: 1px solid var(--line); }
    .step { position: relative; padding: 28px 22px 10px 0; margin-right: 22px; }
    .step:not(:last-child)::after { content: "→"; position: absolute; right: 0; top: 31px; color: var(--red); font-size: 22px; }
    .step-index { color: var(--red); font-size: 30px; font-weight: 800; }
    .step h3 { font-size: 17px; margin: 8px 0; }
    .step p { color: var(--muted); font-size: 13px; }
    .solutions { background: #f7f4f1; }
    .solution-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 15px; }
    .solution { min-height: 150px; padding: 22px; background: var(--white); border-bottom: 3px solid var(--teal); }
    .solution h3 { font-size: 17px; margin-bottom: 8px; }
    .solution p { color: var(--muted); font-size: 13px; margin: 0; }
    .comparison { background: #fff7f2; }
    .score-panel { display: grid; grid-template-columns: 1fr 2fr; gap: 30px; align-items: stretch; margin-bottom: 32px; }
    .score { padding: 28px; background: var(--red); color: #fff; border-radius: var(--radius); }
    .score small { color: #ffd9d3; }
    .score strong { display: block; margin: 4px 0; font-size: 56px; line-height: 1; }
    .stars { color: #ffe28b; font-size: 24px; letter-spacing: 3px; }
    .score-copy { padding: 28px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); }
    .score-copy p { color: var(--muted); margin: 0; }
    .table-wrap { overflow-x: auto; background: #fff; border: 1px solid var(--line); }
    table { width: 100%; border-collapse: collapse; min-width: 760px; }
    th, td { padding: 16px 18px; border-bottom: 1px solid var(--line); text-align: left; font-size: 14px; }
    th { color: var(--red-deep); background: #fff1ed; }
    td:first-child { font-weight: 700; }
    .good { color: var(--teal); font-weight: 700; }
    .case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
    .case-card { background: #fff; border: 1px solid var(--line); overflow: hidden; border-radius: var(--radius); }
    .case-image { aspect-ratio: 16 / 9; overflow: hidden; background: #f2ebe7; }
    .case-image img { width: 100%; height: 100%; object-fit: cover; }
    .case-body { padding: 20px; }
    .case-body h3 { margin-bottom: 7px; }
    .case-body p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .reviews { background: var(--blue); color: #fff; }
    .reviews .section-head p, .reviews .section-kicker { color: #c8d4e7; }
    .review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .review { padding: 23px; background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.18); border-radius: var(--radius); }
    .review p { color: #e7edf6; font-size: 14px; }
    .review footer { color: #ffc5b8; font-size: 13px; font-weight: 700; }
    .pricing { background: #fff; }
    .price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .price-card { padding: 26px; border: 1px solid var(--line); background: #fffaf7; }
    .price-card.featured { border: 2px solid var(--red); background: #fff3ef; }
    .price-card h3 { margin-bottom: 8px; }
    .price-card strong { display: block; color: var(--red-deep); font-size: 31px; margin: 10px 0; }
    .price-card p { color: var(--muted); font-size: 14px; }
    .price-card ul { margin: 15px 0 0; padding-left: 19px; color: var(--muted); font-size: 14px; }
    .timeline { background: #f7f4f1; }
    .timeline-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
    .timeline-item { padding: 22px; background: #fff; border-left: 4px solid var(--gold); }
    .timeline-item strong { color: var(--red-deep); }
    .timeline-item p { color: var(--muted); font-size: 14px; margin: 8px 0 0; }
    .articles { background: #fff; }
    .article-list { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
    .article-list a { padding: 18px; min-height: 124px; border: 1px solid var(--line); background: #fffaf7; transition: transform .2s ease, border-color .2s ease; }
    .article-list a:hover { transform: translateY(-3px); border-color: var(--red); }
    .article-list span { display: block; color: var(--red); font-size: 12px; margin-bottom: 8px; }
    .article-list strong { font-size: 14px; line-height: 1.5; }
    .faq { background: #fff7f2; }
    .faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 22px; }
    details { background: #fff; border: 1px solid var(--line); padding: 17px 19px; }
    summary { cursor: pointer; font-weight: 700; padding-right: 20px; }
    details p { color: var(--muted); font-size: 14px; margin: 12px 0 0; }
    .contact { background: #fff; }
    .contact-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 46px; align-items: start; }
    .contact-copy p { color: var(--muted); }
    .contact-list { padding: 0; margin: 25px 0 0; list-style: none; }
    .contact-list li { padding: 10px 0; border-bottom: 1px solid var(--line); color: var(--muted); }
    .contact-list strong { color: var(--ink); display: inline-block; min-width: 90px; }
    form { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; padding: 28px; background: #fff7f2; border: 1px solid var(--line); }
    .field { display: flex; flex-direction: column; gap: 6px; }
    .field.full { grid-column: 1 / -1; }
    label { font-size: 13px; font-weight: 700; }
    input, select, textarea { width: 100%; border: 1px solid #dccbc4; border-radius: 4px; padding: 12px 13px; color: var(--ink); background: #fff; font: inherit; }
    textarea { min-height: 125px; resize: vertical; }
    .submit-row { grid-column: 1 / -1; display: flex; align-items: center; gap: 15px; flex-wrap: wrap; }
    .form-note { color: var(--muted); font-size: 12px; }
    .footer { background: #202631; color: #e9eef5; padding: 48px 0 24px; }
    .footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 35px; }
    .footer h3 { color: #fff; font-size: 17px; }
    .footer p, .footer li, .footer a { color: #b9c4d1; font-size: 13px; }
    .footer ul { list-style: none; padding: 0; margin: 0; }
    .footer li { margin: 7px 0; }
    .footer a:hover { color: #ffb2a9; }
    .qr { width: 112px; margin-top: 12px; }
    .copyright { padding-top: 22px; margin-top: 30px; border-top: 1px solid rgba(255,255,255,.14); color: #9da9b8; font-size: 12px; }
    .float-tools { position: fixed; right: 18px; bottom: 18px; z-index: 15; display: flex; flex-direction: column; gap: 9px; }
    .float-tools a, .top-button { width: 44px; height: 44px; display: grid; place-items: center; border: 0; border-radius: 50%; color: #fff; background: var(--red); box-shadow: 0 8px 18px rgba(0,0,0,.15); cursor: pointer; font-size: 18px; }
    .reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
    .reveal.visible { opacity: 1; transform: translateY(0); }
    @media (max-width: 980px) {
      .nav-links { display: none; position: absolute; left: 20px; right: 20px; top: 70px; padding: 12px; background: #fffaf7; border: 1px solid var(--line); box-shadow: var(--shadow); }
      .nav-links.open { display: grid; grid-template-columns: repeat(2, 1fr); }
      .nav-links a { padding: 11px 12px; }
      .menu-toggle { display: block; }
      .nav-cta { display: none; }
      .service-grid, .case-grid, .review-grid { grid-template-columns: repeat(2, 1fr); }
      .solution-grid { grid-template-columns: repeat(2, 1fr); }
      .article-list { grid-template-columns: repeat(3, 1fr); }
      .hero-metrics { grid-template-columns: repeat(2, 1fr); gap: 18px 0; }
      .metric:nth-child(2) { border-right: 0; }
      .metric:nth-child(3) { border-top: 1px solid #e5c8c1; padding-top: 18px; }
      .metric:nth-child(4) { border-top: 1px solid #e5c8c1; padding-top: 18px; }
    }
    @media (max-width: 680px) {
      .container { width: min(100% - 28px, 1180px); }
      .brand-copy { display: none; }
      .hero-inner { padding: 60px 0 50px; }
      h1 { font-size: 39px; }
      .hero-lead { font-size: 16px; }
      section { padding: 62px 0; }
      .section-head, .about-grid, .score-panel, .contact-grid { display: block; }
      .section-head p { margin-top: 14px; }
      .service-grid, .case-grid, .review-grid, .solution-grid, .price-grid, .timeline-grid, .faq-list { grid-template-columns: 1fr; }
      .steps { grid-template-columns: 1fr; }
      .step { border-bottom: 1px solid var(--line); margin-right: 0; padding-right: 0; }
      .step:not(:last-child)::after { content: "↓"; right: 10px; top: 28px; }
      .article-list { grid-template-columns: 1fr 1fr; }
      .score-copy { margin-top: 16px; }
      form { grid-template-columns: 1fr; padding: 20px; }
      .field.full, .submit-row { grid-column: auto; }
      .footer-grid { grid-template-columns: 1fr; gap: 22px; }
      .hero-metrics { grid-template-columns: 1fr 1fr; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
    }