:root {
      color-scheme: light;
      --ink: #20251c;
      --muted: #5d6257;
      --paper: #fffdf5;
      --yellow: #f5c400;
      --yellow-deep: #e1ad00;
      --line: #e7e2cf;
      --green: #315b46;
      --soft-green: #edf4e8;
      --white: #fff;
      --container: 1160px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; scroll-padding-top: 84px; }
    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; 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; }
    .site-header {
      position: sticky; top: 0; z-index: 20;
      background: rgba(255,253,245,.96);
      border-bottom: 1px solid rgba(32,37,28,.1);
      backdrop-filter: blur(12px);
    }
    .nav-wrap { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
    .brand { display: inline-flex; align-items: center; min-width: 144px; }
    .ai-page-logo { display: block; max-width: 100%; height: auto; width: 142px; max-height: 46px; object-fit: contain; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; gap: 0; flex-wrap: wrap; }
    .nav-links a { padding: 9px 10px; color: #454a40; font-size: 13px; border-radius: 4px; transition: background .2s, color .2s; }
    .nav-links a:hover { background: #f4e7a5; color: #1f241b; }
    .nav-actions { display: flex; align-items: center; gap: 9px; white-space: nowrap; }
    .menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); background: var(--white); color: var(--ink); border-radius: 4px; cursor: pointer; }
    .btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 46px; padding: 0 19px; border: 1px solid var(--ink); background: var(--ink); color: var(--white); font-weight: 700; border-radius: 4px; transition: transform .18s, box-shadow .18s, background .18s; cursor: pointer; }
    .btn:hover { transform: translateY(-2px); box-shadow: 0 7px 0 rgba(32,37,28,.12); }
    .btn-yellow { background: var(--yellow); border-color: var(--yellow); color: #211f12; }
    .btn-outline { background: transparent; color: var(--ink); }
    .hero {
      overflow: hidden;
      position: relative;
      background: var(--yellow);
      border-bottom: 1px solid #d8b000;
    }
    .hero::before {
      content: ""; position: absolute; width: 360px; aspect-ratio: 1; right: -70px; top: -150px;
      border: 1px solid rgba(32,37,28,.2); border-radius: 50%;
      box-shadow: 0 0 0 32px rgba(255,255,255,.08), 0 0 0 70px rgba(255,255,255,.06);
      animation: orbit 18s linear infinite;
    }
    .hero-inner { position: relative; display: grid; grid-template-columns: minmax(0,1.25fr) minmax(260px,.75fr); gap: 54px; align-items: center; padding-top: 76px; padding-bottom: 64px; }
    .eyebrow { display: inline-flex; align-items: center; gap: 9px; margin: 0 0 20px; color: #333522; font-size: 13px; font-weight: 800; letter-spacing: 0; }
    .eyebrow::before { content: ""; width: 22px; height: 3px; background: var(--green); }
    h1 { max-width: 720px; margin: 0; font-size: clamp(40px, 6vw, 68px); line-height: 1.08; letter-spacing: 0; }
    .hero-copy { max-width: 650px; margin: 22px 0 28px; color: #333522; font-size: 17px; }
    .hero-buttons { display: flex; flex-wrap: wrap; gap: 12px; }
    .hero .btn-outline { border-color: rgba(32,37,28,.58); }
    .hero-aside { position: relative; padding: 25px 0 25px 25px; border-left: 1px solid rgba(32,37,28,.3); }
    .hero-aside h2 { margin: 0 0 10px; font-size: 18px; }
    .hero-aside p { margin: 0; max-width: 300px; color: #414333; font-size: 14px; }
    .hero-stamp { display: grid; place-items: center; width: 94px; aspect-ratio: 1; margin-top: 25px; border: 1px solid var(--ink); border-radius: 50%; text-align: center; font-size: 13px; font-weight: 800; line-height: 1.3; transform: rotate(-9deg); }
    .stats { position: relative; display: grid; grid-template-columns: repeat(4,1fr); background: var(--ink); color: var(--white); }
    .stat { padding: 21px 24px; border-right: 1px solid rgba(255,255,255,.18); }
    .stat:last-child { border-right: 0; }
    .stat strong { display: block; font-size: 21px; color: var(--yellow); }
    .stat span { display: block; margin-top: 3px; color: #e0e3d9; font-size: 12px; }
    .section { padding: 78px 0; }
    .section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 31px; }
    .section-head > div { max-width: 720px; }
    .kicker { margin: 0 0 8px; color: #687145; font-size: 12px; font-weight: 800; text-transform: uppercase; }
    h2 { margin: 0; font-size: clamp(28px, 4vw, 39px); line-height: 1.2; letter-spacing: 0; }
    .section-intro { max-width: 640px; margin: 12px 0 0; color: var(--muted); }
    .text-link { display: inline-flex; align-items: center; gap: 7px; font-weight: 700; border-bottom: 1px solid var(--ink); padding-bottom: 3px; }
    .about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 54px; align-items: start; }
    .about-copy p { color: var(--muted); margin: 0 0 16px; }
    .capability-list { display: grid; grid-template-columns: 1fr 1fr; gap: 0 24px; border-top: 1px solid var(--line); }
    .capability { padding: 16px 0; border-bottom: 1px solid var(--line); }
    .capability strong { display: block; font-size: 15px; }
    .capability span { color: var(--muted); font-size: 13px; }
    .platform-strip { margin-top: 30px; padding: 20px 0; border-block: 1px solid var(--line); }
    .platform-strip p { margin: 0 0 13px; font-size: 13px; font-weight: 800; }
    .tags { display: flex; flex-wrap: wrap; gap: 8px; }
    .tag { display: inline-flex; padding: 6px 10px; border: 1px solid #dcd7c6; background: #fffef9; color: #3b4037; font-size: 12px; }
    .services-band { background: #f2f4e9; border-block: 1px solid #e2e6d7; }
    .service-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 0 25px; }
    .service-item { min-height: 150px; padding: 22px 0; border-top: 1px solid #d8dfce; }
    .service-item .num { color: #687145; font-size: 12px; font-weight: 800; }
    .service-item h3 { margin: 7px 0 6px; font-size: 18px; }
    .service-item p { margin: 0; color: var(--muted); font-size: 14px; }
    .workflow { display: grid; grid-template-columns: repeat(4,1fr); border-block: 1px solid var(--line); }
    .step { position: relative; padding: 23px 22px 25px 0; }
    .step + .step { padding-left: 22px; border-left: 1px solid var(--line); }
    .step strong { display: block; margin-bottom: 8px; color: var(--green); font-size: 13px; }
    .step h3 { margin: 0 0 6px; font-size: 17px; }
    .step p { margin: 0; color: var(--muted); font-size: 13px; }
    .industry-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 34px; }
    .industry { display: grid; grid-template-columns: 100px 1fr; gap: 18px; padding: 20px 0; border-top: 1px solid var(--line); }
    .industry-label { color: var(--green); font-weight: 800; font-size: 13px; }
    .industry h3 { margin: 0 0 5px; font-size: 17px; }
    .industry p { margin: 0; color: var(--muted); font-size: 14px; }
    .comparison-band { background: #fff7d7; border-block: 1px solid #eadb9f; }
    .review-score { display: flex; align-items: center; gap: 15px; margin: 20px 0 25px; }
    .score-number { font-size: 46px; line-height: 1; font-weight: 800; }
    .score-meta { color: #4d4a39; font-size: 13px; }
    .stars { color: #a27600; font-size: 19px; letter-spacing: 2px; }
    .table-wrap { overflow-x: auto; border: 1px solid #ded4ae; background: #fffdf5; }
    table { width: 100%; border-collapse: collapse; min-width: 690px; }
    th, td { padding: 14px 16px; text-align: left; border-bottom: 1px solid #ebe4ca; font-size: 14px; }
    th { background: #f7efcf; font-size: 13px; }
    td:first-child { font-weight: 700; }
    tr:last-child td { border-bottom: 0; }
    .positive { color: #315b46; font-weight: 700; }
    .case-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 38px; align-items: start; }
    .case-feature { padding: 25px; background: var(--green); color: #fff; }
    .case-feature h3 { margin: 0 0 10px; font-size: 21px; }
    .case-feature p { margin: 0 0 18px; color: #e5efe5; }
    .case-feature .tag { background: transparent; color: #fff; border-color: rgba(255,255,255,.35); }
    .case-list { border-top: 1px solid var(--line); }
    .case-row { display: flex; justify-content: space-between; align-items: center; gap: 14px; padding: 17px 0; border-bottom: 1px solid var(--line); }
    .case-row strong { display: block; font-size: 15px; }
    .case-row span { color: var(--muted); font-size: 13px; }
    .reviews { background: #f5f6ef; border-block: 1px solid #e5e8dc; }
    .review-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 0 24px; }
    .review { padding: 20px 0; border-top: 1px solid #dce2d4; }
    .review blockquote { margin: 0 0 16px; color: #343a31; font-size: 14px; }
    .review cite { color: #687145; font-size: 12px; font-style: normal; font-weight: 800; }
    .review cite span { display: block; color: var(--muted); font-weight: 400; }
    .faq-list { border-top: 1px solid var(--line); }
    details { border-bottom: 1px solid var(--line); }
    summary { position: relative; padding: 17px 34px 17px 0; cursor: pointer; list-style: none; font-weight: 700; }
    summary::-webkit-details-marker { display: none; }
    summary::after { content: "+"; position: absolute; right: 3px; top: 12px; font-size: 22px; font-weight: 400; }
    details[open] summary::after { content: "−"; }
    details p { margin: 0; padding: 0 30px 18px 0; color: var(--muted); font-size: 14px; }
    .faq-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 36px; }
    .article-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 22px; }
    .article { padding: 19px 0; border-top: 2px solid var(--yellow-deep); }
    .article span { color: #687145; font-size: 12px; font-weight: 800; }
    .article h3 { margin: 9px 0 7px; font-size: 17px; line-height: 1.45; }
    .article p { margin: 0; color: var(--muted); font-size: 13px; }
    .contact-band { background: var(--yellow); border-top: 1px solid #d8b000; }
    .contact-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 50px; align-items: start; }
    .contact-copy p { max-width: 430px; color: #424131; }
    .contact-details { display: grid; gap: 9px; margin-top: 22px; font-size: 14px; }
    .contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 13px; padding: 23px; background: #fffdf5; border: 1px solid rgba(32,37,28,.18); }
    .field { display: grid; gap: 6px; }
    .field.full { grid-column: 1 / -1; }
    .field label { font-size: 12px; font-weight: 700; }
    .field input, .field select, .field textarea { width: 100%; padding: 11px 12px; border: 1px solid #d9d5c6; border-radius: 3px; background: #fff; color: var(--ink); }
    .field textarea { min-height: 105px; resize: vertical; }
    .contact-form .btn { justify-self: start; }
    .footer { background: #20251c; color: #f4f3e9; }
    .footer-main { display: grid; grid-template-columns: 1.2fr .8fr; gap: 40px; padding-top: 37px; padding-bottom: 30px; }
    .footer p { margin: 9px 0 0; color: #d0d3c9; font-size: 13px; }
    .footer h2 { font-size: 17px; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 10px 17px; margin-top: 14px; }
    .footer-links a { color: #f2dc79; font-size: 13px; }
    .copyright { padding: 14px 0; border-top: 1px solid #454a40; color: #c9cdc2; font-size: 12px; }
    .float-contact { position: fixed; right: 18px; bottom: 20px; z-index: 15; display: flex; flex-direction: column; gap: 9px; }
    .float-contact a { display: grid; place-items: center; min-width: 48px; min-height: 48px; padding: 0 12px; background: var(--ink); color: #fff; border: 1px solid rgba(255,255,255,.25); border-radius: 4px; font-size: 12px; box-shadow: 0 4px 14px rgba(0,0,0,.18); }
    .float-contact a:first-child { background: var(--yellow); color: var(--ink); }
    .reveal { opacity: 0; transform: translateY(12px); transition: opacity .55s ease, transform .55s ease; }
    .reveal.is-visible { opacity: 1; transform: translateY(0); }
    @keyframes orbit { to { transform: rotate(360deg); } }
    @media (max-width: 1000px) {
      .nav-links { display: none; position: absolute; left: 0; right: 0; top: 72px; padding: 14px 20px 18px; background: var(--paper); border-bottom: 1px solid var(--line); box-shadow: 0 10px 18px rgba(32,37,28,.08); }
      .nav-links.open { display: grid; grid-template-columns: repeat(3,1fr); }
      .nav-links a { padding: 10px 8px; }
      .menu-toggle { display: inline-grid; place-items: center; }
      .nav-wrap { gap: 12px; }
      .nav-actions { margin-left: auto; }
    }
    @media (max-width: 720px) {
      .container { width: min(var(--container), calc(100% - 32px)); }
      .nav-wrap { min-height: 64px; }
      .nav-links { top: 64px; }
      .nav-links.open { grid-template-columns: repeat(2,1fr); }
      .brand { min-width: 0; }
      .ai-page-logo { width: 124px; }
      .nav-actions .btn { min-height: 40px; padding-inline: 11px; font-size: 12px; }
      .hero-inner { grid-template-columns: 1fr; gap: 30px; padding-top: 56px; padding-bottom: 42px; }
      h1 { font-size: 43px; }
      .hero-copy { font-size: 15px; }
      .hero-aside { display: flex; align-items: center; gap: 18px; padding: 16px 0 0; border-left: 0; border-top: 1px solid rgba(32,37,28,.3); }
      .hero-stamp { flex: 0 0 72px; width: 72px; margin: 0; font-size: 11px; }
      .stats { grid-template-columns: 1fr 1fr; }
      .stat { padding: 16px; border-bottom: 1px solid rgba(255,255,255,.18); }
      .stat:nth-child(2) { border-right: 0; }
      .section { padding: 57px 0; }
      .section-head { display: block; }
      .section-head > .text-link { margin-top: 18px; }
      .about-grid, .case-grid, .contact-grid { grid-template-columns: 1fr; gap: 28px; }
      .service-grid { grid-template-columns: 1fr 1fr; gap: 0 18px; }
      .workflow { grid-template-columns: 1fr 1fr; }
      .step { padding: 18px 12px 18px 0; }
      .step + .step { padding-left: 14px; }
      .step:nth-child(3) { border-left: 0; padding-left: 0; border-top: 1px solid var(--line); }
      .step:nth-child(4) { border-top: 1px solid var(--line); }
      .industry-grid { grid-template-columns: 1fr; gap: 0; }
      .review-grid { grid-template-columns: 1fr 1fr; gap: 0 18px; }
      .faq-columns { grid-template-columns: 1fr; gap: 0; }
      .article-grid { grid-template-columns: 1fr; gap: 0; }
      .footer-main { grid-template-columns: 1fr; gap: 24px; }
    }
    @media (max-width: 460px) {
      .nav-actions .btn { display: none; }
      .hero-buttons .btn { flex: 1 1 auto; }
      .service-grid, .review-grid { grid-template-columns: 1fr; }
      .industry { grid-template-columns: 78px 1fr; gap: 12px; }
      .contact-form { grid-template-columns: 1fr; padding: 17px; }
      .field.full { grid-column: auto; }
      .float-contact { right: 10px; bottom: 12px; }
      .float-contact a { min-width: 44px; min-height: 44px; padding: 0 9px; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
      .reveal { opacity: 1; transform: none; }
    }