:root {
      --yellow: #f5c400;
      --yellow-light: #fff4b8;
      --ink: #1c2024;
      --muted: #626a72;
      --line: #e6e8eb;
      --paper: #fffdf6;
      --soft: #f5f6f4;
      --green: #164d40;
      --orange: #ed6c31;
      --shadow: 0 18px 50px rgba(28,32,36,.08);
      --container: 1180px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
      line-height: 1.7;
    }
    a { color: inherit; text-decoration: none; }
    img { display: block; max-width: 100%; height: auto; }
    .container { width: min(var(--container), calc(100% - 40px)); margin: 0 auto; }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(255,253,246,.94);
      border-bottom: 1px solid rgba(28,32,36,.08);
      backdrop-filter: blur(14px);
    }
    .nav-bar {
      min-height: 74px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }
    .brand { display: flex; align-items: center; flex: 0 0 auto; }
    .ai-page-logo { width: 128px; }
    .nav-links {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 0;
      flex-wrap: wrap;
    }
    .nav-links a {
      padding: 8px 10px;
      color: #3a4146;
      font-size: 13px;
      transition: color .2s ease;
    }
    .nav-links a:hover { color: #b08b00; }
    .nav-cta, .button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border: 1px solid var(--ink);
      border-radius: 5px;
      padding: 12px 18px;
      font-weight: 700;
      cursor: pointer;
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    }
    .nav-cta { background: var(--yellow); padding: 9px 15px; font-size: 13px; }
    .button:hover, .nav-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 16px rgba(28,32,36,.12); }
    .button-primary { background: var(--yellow); }
    .button-dark { color: #fff; background: var(--ink); border-color: var(--ink); }
    .button-light { background: #fff; }
    .menu-toggle {
      display: none;
      border: 1px solid var(--ink);
      background: #fff;
      border-radius: 4px;
      padding: 8px 10px;
      font-size: 18px;
    }
    .hero {
      position: relative;
      overflow: hidden;
      background: var(--yellow);
      padding: 82px 0 72px;
      border-bottom: 1px solid var(--ink);
    }
    .hero:before, .hero:after {
      content: "";
      position: absolute;
      border: 1px solid rgba(28,32,36,.18);
      transform: rotate(12deg);
      pointer-events: none;
    }
    .hero:before { width: 320px; height: 320px; right: -100px; top: -150px; }
    .hero:after { width: 180px; height: 180px; left: 42%; bottom: -120px; }
    .hero-grid {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: minmax(0, 1.15fr) minmax(300px, .85fr);
      gap: 60px;
      align-items: center;
    }
    .eyebrow, .section-kicker {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: #4e4300;
      font-size: 12px;
      font-weight: 800;
      letter-spacing: 1px;
      text-transform: uppercase;
    }
    .eyebrow:before, .section-kicker:before {
      content: "";
      width: 22px;
      height: 3px;
      background: currentColor;
    }
    h1, h2, h3, p { margin-top: 0; }
    h1 {
      max-width: 720px;
      margin-bottom: 20px;
      font-size: clamp(38px, 6vw, 72px);
      line-height: 1.08;
      letter-spacing: 0;
    }
    .hero-copy { max-width: 650px; color: #3a350f; font-size: 18px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
    .hero-panel {
      background: rgba(255,255,255,.5);
      border: 1px solid rgba(28,32,36,.42);
      padding: 22px;
      box-shadow: 10px 10px 0 rgba(28,32,36,.11);
    }
    .hero-panel-head { display: flex; justify-content: space-between; gap: 20px; border-bottom: 1px solid rgba(28,32,36,.25); padding-bottom: 14px; margin-bottom: 15px; }
    .hero-panel strong { font-size: 28px; }
    .hero-status { color: #4f4607; font-size: 13px; }
    .signal-list { display: grid; gap: 12px; }
    .signal-item { display: flex; justify-content: space-between; gap: 16px; padding: 11px 0; border-bottom: 1px solid rgba(28,32,36,.14); font-size: 14px; }
    .signal-item:last-child { border-bottom: 0; }
    .signal-item b { font-size: 15px; }
    section { padding: 88px 0; }
    .section-head { display: flex; justify-content: space-between; align-items: end; gap: 30px; margin-bottom: 34px; }
    .section-head h2 { max-width: 650px; margin: 8px 0 0; font-size: clamp(28px, 4vw, 46px); line-height: 1.15; }
    .section-head p { max-width: 500px; margin-bottom: 0; color: var(--muted); }
    .about { background: #fff; }
    .about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 58px; align-items: start; }
    .lead { font-size: 21px; line-height: 1.55; }
    .feature-list { display: grid; grid-template-columns: repeat(2,1fr); gap: 18px; }
    .feature { padding: 20px 0; border-top: 2px solid var(--yellow); }
    .feature h3 { font-size: 18px; margin-bottom: 5px; }
    .feature p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .metrics { display: grid; grid-template-columns: repeat(4,1fr); gap: 14px; margin-top: 42px; }
    .metric { padding: 22px; background: var(--soft); border-left: 4px solid var(--yellow); }
    .metric strong { display: block; font-size: 31px; line-height: 1.1; margin-bottom: 7px; }
    .metric span { color: var(--muted); font-size: 13px; }
    .services { background: #f4f6f2; }
    .service-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; }
    .service-card { background: #fff; border: 1px solid var(--line); padding: 24px; transition: transform .25s ease, box-shadow .25s ease; }
    .service-card:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
    .service-card h3 { margin-bottom: 8px; font-size: 20px; }
    .service-card p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .service-tag { display: inline-block; margin-bottom: 22px; color: #725d00; background: var(--yellow-light); padding: 3px 8px; font-size: 12px; font-weight: 700; }
    .production { background: var(--green); color: #fff; }
    .production .section-kicker, .production .section-head p { color: #d5e8d9; }
    .production .section-head h2 { color: #fff; }
    .steps { display: grid; grid-template-columns: repeat(4,1fr); gap: 0; border-top: 1px solid rgba(255,255,255,.35); }
    .step { padding: 24px 22px 8px 0; border-right: 1px solid rgba(255,255,255,.25); margin-right: 22px; }
    .step:last-child { border-right: 0; }
    .step-number { color: var(--yellow); font-size: 13px; font-weight: 800; }
    .step h3 { margin: 22px 0 8px; color: #fff; font-size: 20px; }
    .step p { color: #d5e8d9; font-size: 14px; }
    .solution-grid, .case-grid, .review-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
    .solution { padding: 25px; border: 1px solid var(--line); background: #fff; }
    .solution h3 { margin-bottom: 9px; }
    .solution p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .network { background: #fff; }
    .network-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 48px; align-items: start; }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 9px; }
    .tag-cloud span { padding: 8px 12px; background: #fff6c9; border: 1px solid #efd76c; font-size: 14px; }
    .network-note { color: var(--muted); }
    .timeline { display: grid; gap: 0; }
    .timeline-item { display: grid; grid-template-columns: 110px 1fr; gap: 24px; padding: 20px 0; border-bottom: 1px solid var(--line); }
    .timeline-item b { color: #9a7800; }
    .timeline-item p { margin: 0; color: var(--muted); }
    .case-card { background: #fff; border: 1px solid var(--line); overflow: hidden; }
    .case-image { aspect-ratio: 16/9; overflow: hidden; background: #ecece8; }
    .case-image img { width: 100%; height: 100%; object-fit: cover; }
    .case-body { padding: 20px; }
    .case-body h3 { margin-bottom: 8px; }
    .case-body p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .comparison { background: #f4f6f2; }
    .score-box { display: flex; align-items: center; gap: 20px; padding: 20px 24px; background: var(--yellow); border: 1px solid var(--ink); }
    .score-box strong { font-size: 40px; line-height: 1; }
    .stars { color: #665100; letter-spacing: 3px; }
    .table-wrap { overflow-x: auto; background: #fff; border: 1px solid var(--line); }
    table { width: 100%; min-width: 760px; border-collapse: collapse; }
    th, td { padding: 16px 18px; border-bottom: 1px solid var(--line); text-align: left; font-size: 14px; }
    th { background: #1c2024; color: #fff; font-weight: 700; }
    td:first-child { font-weight: 700; }
    tr:last-child td { border-bottom: 0; }
    .positive { color: #176b4c; font-weight: 700; }
    .match { background: #fff; }
    .match-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 46px; align-items: start; }
    .price-panel { background: var(--yellow); padding: 28px; border: 1px solid var(--ink); }
    .price-panel h3 { font-size: 28px; margin-bottom: 12px; }
    .price-panel p { color: #4e4300; }
    .price-lines { margin: 24px 0 0; }
    .price-line { display: flex; justify-content: space-between; gap: 20px; padding: 12px 0; border-bottom: 1px solid rgba(28,32,36,.22); font-size: 14px; }
    .price-line:last-child { border-bottom: 0; }
    .reviews { background: #fff; }
    .review-card { padding: 22px; border: 1px solid var(--line); }
    .review-card p { color: #454c51; font-size: 15px; }
    .review-author { display: flex; justify-content: space-between; gap: 15px; border-top: 1px solid var(--line); padding-top: 13px; color: var(--muted); font-size: 13px; }
    .help { background: #f4f6f2; }
    .faq-list { display: grid; gap: 10px; max-width: 920px; }
    details { background: #fff; border: 1px solid var(--line); }
    summary { cursor: pointer; list-style: none; padding: 18px 22px; font-weight: 700; display: flex; justify-content: space-between; gap: 20px; }
    summary::-webkit-details-marker { display: none; }
    summary:after { content: "+"; color: #9a7800; font-size: 22px; line-height: 1; }
    details[open] summary:after { content: "−"; }
    details p { padding: 0 22px 18px; margin: 0; color: var(--muted); font-size: 14px; }
    .articles { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
    .article { display: block; padding: 22px; border-left: 4px solid var(--yellow); background: #fff; border-top: 1px solid var(--line); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
    .article small { color: #a17d00; }
    .article h3 { margin: 8px 0 0; font-size: 18px; }
    .contact { background: var(--yellow); }
    .contact-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 52px; align-items: start; }
    .contact h2 { font-size: clamp(30px,4vw,48px); line-height: 1.15; }
    .contact-intro { color: #4e4300; }
    .contact-list { display: grid; gap: 9px; margin-top: 25px; font-size: 14px; }
    .form-box { background: #fff; padding: 28px; border: 1px solid var(--ink); }
    .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
    label { display: grid; gap: 7px; font-size: 13px; font-weight: 700; }
    input, select, textarea { width: 100%; border: 1px solid #cdd1d2; padding: 12px 13px; border-radius: 3px; font: inherit; color: var(--ink); background: #fff; }
    textarea { min-height: 118px; resize: vertical; }
    .field-full { grid-column: 1 / -1; }
    .form-submit { margin-top: 18px; }
    .join { background: #fff; }
    .join-box { display: flex; align-items: center; justify-content: space-between; gap: 30px; padding: 30px; background: var(--green); color: #fff; }
    .join-box h2 { margin-bottom: 8px; color: #fff; }
    .join-box p { margin: 0; color: #d5e8d9; }
    .footer { background: #1c2024; color: #f3f5f0; padding: 48px 0 24px; }
    .footer-grid { display: grid; grid-template-columns: 1.1fr .9fr .9fr; gap: 42px; }
    .footer h3 { color: var(--yellow); font-size: 17px; }
    .footer p, .footer a { color: #c6ccd0; font-size: 13px; }
    .footer a:hover { color: var(--yellow); }
    .footer-links { display: grid; gap: 6px; }
    .copyright { margin-top: 36px; padding-top: 18px; border-top: 1px solid #3a4146; color: #9da5aa; font-size: 12px; }
    .floating-contact { position: fixed; z-index: 15; right: 20px; bottom: 20px; }
    .floating-contact button { border: 1px solid var(--ink); background: var(--yellow); padding: 12px 16px; font-weight: 700; cursor: pointer; box-shadow: 0 8px 22px rgba(0,0,0,.16); }
    .qr-pop { display: none; position: absolute; right: 0; bottom: 56px; width: 190px; padding: 12px; background: #fff; border: 1px solid var(--ink); box-shadow: var(--shadow); }
    .qr-pop img { width: 166px; }
    .floating-contact:hover .qr-pop { display: block; }
    .reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
    .reveal.visible { opacity: 1; transform: translateY(0); }
    @media (max-width: 1050px) {
      .nav-links { display: none; position: absolute; top: 74px; left: 0; right: 0; padding: 15px 20px; background: var(--paper); border-bottom: 1px solid var(--line); }
      .nav-links.open { display: grid; grid-template-columns: repeat(2,1fr); }
      .nav-links a { padding: 11px 8px; }
      .menu-toggle { display: block; }
      .hero-grid, .network-layout, .match-grid, .contact-grid { grid-template-columns: 1fr; }
      .hero { padding-top: 62px; }
    }
    @media (max-width: 760px) {
      .container { width: min(var(--container), calc(100% - 28px)); }
      section { padding: 62px 0; }
      .section-head { display: block; }
      .section-head p { margin-top: 16px; }
      .metrics, .service-grid, .solution-grid, .case-grid, .review-grid { grid-template-columns: 1fr; }
      .about-grid, .feature-list, .articles, .footer-grid { grid-template-columns: 1fr; }
      .steps { grid-template-columns: 1fr; }
      .step { border-right: 0; border-bottom: 1px solid rgba(255,255,255,.25); margin-right: 0; padding-right: 0; }
      .step:last-child { border-bottom: 0; }
      .form-grid { grid-template-columns: 1fr; }
      .field-full { grid-column: auto; }
      .join-box { display: block; }
      .join-box .button { margin-top: 20px; }
      .nav-cta { display: none; }
      h1 { font-size: 42px; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *:before, *:after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
      .reveal { opacity: 1; transform: none; }
    }