:root {
      color-scheme: light;
      --ink: #25282c;
      --muted: #646b70;
      --paper: #f8f8f4;
      --white: #fff;
      --line: #e5e6df;
      --coral: #ee654e;
      --teal: #187f78;
      --blue: #406dc4;
      --yellow: #f3c64e;
      --green: #dff0e9;
      --container: 1160px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      font-family: "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
      line-height: 1.65;
    }
    a { color: inherit; }
    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(248,248,244,.96); border-bottom: 1px solid var(--line); }
    .nav-row { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
    .brand { display: inline-flex; align-items: center; text-decoration: none; flex: 0 0 auto; }
    .ai-page-logo { display: block; width: 142px; max-height: 48px; object-fit: contain; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; flex-wrap: wrap; gap: 0; }
    .nav-links a { padding: 8px 10px; color: #454b50; font-size: 13px; text-decoration: none; white-space: nowrap; transition: color .2s ease; }
    .nav-links a:hover { color: var(--coral); }
    .nav-cta, .button { display: inline-flex; min-height: 44px; align-items: center; justify-content: center; gap: 8px; padding: 10px 18px; border: 1px solid var(--ink); border-radius: 4px; background: var(--ink); color: white; font-weight: 700; text-decoration: none; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
    .nav-cta:hover, .button:hover { transform: translateY(-2px); box-shadow: 0 8px 20px #25282c20; background: #41474b; }
    .button-light { color: var(--ink); background: white; border-color: #c9ccc5; }
    .button-light:hover { color: var(--ink); background: #f3f4ef; }
    .menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 4px; background: white; color: var(--ink); cursor: pointer; }
    .hero { position: relative; overflow: hidden; padding: 78px 0 50px; background: #f4f2e9; border-bottom: 1px solid #e8e5d9; }
    .hero::before, .hero::after { position: absolute; content: ""; pointer-events: none; }
    .hero::before { width: 250px; height: 120px; top: 36px; right: 8%; border: 3px dashed var(--coral); border-radius: 50%; transform: rotate(-17deg); opacity: .5; animation: drift 8s ease-in-out infinite; }
    .hero::after { width: 72px; height: 72px; right: 15%; bottom: 34px; background: var(--yellow); border: 2px solid var(--ink); border-radius: 50% 44% 52% 46%; transform: rotate(22deg); }
    .hero-inner { position: relative; z-index: 1; max-width: 850px; }
    .eyebrow { margin: 0 0 16px; color: var(--teal); font-size: 13px; font-weight: 800; letter-spacing: .08em; }
    h1 { max-width: 800px; margin: 0; font-size: clamp(42px, 6vw, 68px); line-height: 1.12; }
    .hero h1 span { position: relative; white-space: nowrap; }
    .hero h1 span::after { position: absolute; z-index: -1; content: ""; left: -3px; right: -3px; bottom: 2px; height: 15px; background: var(--yellow); transform: rotate(-1deg); }
    .hero-copy { max-width: 650px; margin: 22px 0 26px; color: #50575a; font-size: 18px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
    .hero-note { margin: 20px 0 0; color: var(--muted); font-size: 13px; }
    .quick-stats { position: relative; z-index: 1; display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 48px; border-top: 1px solid #d8d8cf; }
    .stat { padding: 18px 20px 0 0; }
    .stat + .stat { padding-left: 20px; border-left: 1px solid #d8d8cf; }
    .stat strong { display: block; font-size: 21px; }
    .stat span { color: var(--muted); font-size: 13px; }
    section { padding: 70px 0; }
    .section-head { max-width: 710px; margin-bottom: 30px; }
    .section-head h2 { margin: 0 0 10px; font-size: clamp(28px, 4vw, 40px); line-height: 1.2; }
    .section-head p { margin: 0; color: var(--muted); }
    .section-label { margin: 0 0 8px; color: var(--coral); font-size: 12px; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; }
    .intro-layout { display: grid; grid-template-columns: 1.05fr .95fr; gap: 52px; align-items: start; }
    .intro-copy { font-size: 17px; }
    .intro-copy p { margin: 0 0 16px; }
    .marker-list { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 20px; padding: 0; margin: 22px 0 0; list-style: none; }
    .marker-list li { padding-left: 18px; position: relative; color: #444b4e; }
    .marker-list li::before { content: ""; position: absolute; left: 0; top: .7em; width: 7px; height: 7px; background: var(--coral); border-radius: 50%; }
    .funnel { display: grid; gap: 10px; }
    .funnel-row { display: grid; grid-template-columns: 105px 1fr; gap: 16px; align-items: center; padding: 15px 18px; border-left: 4px solid var(--teal); background: white; }
    .funnel-row:nth-child(2) { margin-inline: 14px; border-left-color: var(--coral); }
    .funnel-row:nth-child(3) { margin-inline: 28px; border-left-color: var(--blue); }
    .funnel-row:nth-child(4) { margin-inline: 42px; border-left-color: #9b7b1e; }
    .funnel-row strong { font-size: 16px; }
    .funnel-row span { color: var(--muted); font-size: 14px; }
    .band { background: #eaf1ed; border-block: 1px solid #d9e4dd; }
    .capability-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0 28px; }
    .capability { padding: 22px 0; border-top: 1px solid #cbd8d0; }
    .capability .number { color: var(--coral); font-size: 12px; font-weight: 800; }
    .capability h3 { margin: 6px 0; font-size: 19px; }
    .capability p { margin: 0; color: var(--muted); font-size: 14px; }
    .service-list { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0 22px; }
    .service-item { padding: 18px 0; border-top: 1px solid var(--line); }
    .service-item h3 { margin: 0 0 7px; font-size: 16px; }
    .service-item p { margin: 0; color: var(--muted); font-size: 13px; }
    .platforms { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
    .platforms span { padding: 6px 10px; border: 1px solid #d6d8d1; border-radius: 3px; background: #fff; color: #42484b; font-size: 12px; }
    .flow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; counter-reset: step; }
    .flow-step { position: relative; padding: 18px 14px 16px; border-top: 3px solid var(--teal); background: white; }
    .flow-step::before { counter-increment: step; content: "0" counter(step); display: block; margin-bottom: 14px; color: var(--coral); font-weight: 800; font-size: 13px; }
    .flow-step h3 { margin: 0 0 7px; font-size: 16px; }
    .flow-step p { margin: 0; color: var(--muted); font-size: 13px; }
    .comparison-band { background: #f1eee3; border-block: 1px solid #e4dfd0; }
    .review-score { display: flex; align-items: center; justify-content: space-between; gap: 18px; margin: 0 0 20px; padding: 18px 20px; background: var(--white); border-left: 5px solid var(--coral); }
    .review-score strong { font-size: 22px; }
    .stars { color: #a77908; letter-spacing: 2px; font-size: 19px; }
    .table-wrap { overflow-x: auto; background: white; }
    table { width: 100%; min-width: 720px; border-collapse: collapse; text-align: left; }
    th, td { padding: 14px 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
    th { background: #e8f1ed; color: #263d39; font-size: 13px; }
    td { font-size: 14px; }
    td:first-child { font-weight: 700; }
    .case-grid, .quote-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
    .case-item { border-top: 4px solid var(--yellow); padding-top: 14px; }
    .case-item:nth-child(2) { border-top-color: var(--teal); }
    .case-item:nth-child(3) { border-top-color: var(--coral); }
    .case-item h3 { margin: 0 0 8px; font-size: 18px; }
    .case-item p { margin: 0; color: var(--muted); font-size: 14px; }
    .quote { margin: 0; padding: 18px 0; border-top: 1px solid var(--line); }
    .quote blockquote { margin: 0 0 14px; color: #41484c; font-size: 14px; }
    .quote figcaption { color: var(--muted); font-size: 12px; font-weight: 700; }
    .quote figcaption span { display: block; color: #8a6039; font-weight: 500; }
    .price-panel { display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: center; padding: 24px 0; border-block: 1px solid var(--line); }
    .price-panel h3 { margin: 0 0 6px; font-size: 20px; }
    .price-panel p { margin: 0; max-width: 720px; color: var(--muted); }
    .price-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
    .price-tags span { padding: 5px 9px; background: #f0e6cc; color: #4d4126; font-size: 12px; }
    .faq-list { border-top: 1px solid var(--line); }
    details { border-bottom: 1px solid var(--line); }
    summary { position: relative; padding: 17px 36px 17px 0; cursor: pointer; list-style: none; font-weight: 700; }
    summary::-webkit-details-marker { display: none; }
    summary::after { content: "+"; position: absolute; right: 4px; top: 13px; color: var(--teal); font-size: 23px; font-weight: 400; }
    details[open] summary::after { content: "−"; }
    details p { max-width: 820px; margin: 0 0 18px; color: var(--muted); font-size: 14px; }
    .contact-band { background: #e8f0ec; border-top: 1px solid #d8e3dc; }
    .contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: start; }
    .contact-meta { display: grid; gap: 12px; margin-top: 24px; }
    .contact-meta p { margin: 0; }
    .contact-meta a { color: #135f59; }
    .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
    .field { display: grid; gap: 6px; }
    .field-wide { grid-column: 1 / -1; }
    label { font-size: 13px; font-weight: 700; }
    input, select, textarea { width: 100%; padding: 11px 12px; color: var(--ink); border: 1px solid #c8d1ca; border-radius: 3px; background: white; }
    textarea { min-height: 112px; resize: vertical; }
    input:focus, select:focus, textarea:focus { outline: 2px solid #71aaa2; outline-offset: 1px; }
    .form-submit { grid-column: 1 / -1; justify-self: start; cursor: pointer; }
    .join-strip { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 28px 0; border-bottom: 1px solid var(--line); }
    .join-strip h2 { margin: 0 0 5px; font-size: 24px; }
    .join-strip p { margin: 0; color: var(--muted); }
    .article-links, .friend-links { display: flex; flex-wrap: wrap; gap: 8px 16px; }
    .article-links a, .friend-links a { color: #385d58; font-size: 13px; text-decoration-thickness: 1px; text-underline-offset: 3px; }
    .article-links a:hover, .friend-links a:hover { color: var(--coral); }
    .subsection { padding: 30px 0 0; }
    .subsection h3 { margin: 0 0 12px; font-size: 18px; }
    .site-footer { padding: 28px 0; background: #e8e9e2; color: #343a3d; border-top: 1px solid #d7d9d1; }
    .footer-row { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
    .footer-row p { margin: 0; font-size: 13px; }
    .floating-contact { position: fixed; z-index: 15; right: 18px; bottom: 18px; display: grid; gap: 8px; }
    .floating-contact a { display: inline-flex; align-items: center; justify-content: center; min-height: 42px; padding: 9px 13px; border: 1px solid var(--ink); border-radius: 3px; background: var(--yellow); color: var(--ink); font-size: 13px; font-weight: 800; text-decoration: none; box-shadow: 2px 3px 0 var(--ink); }
    .floating-contact a:hover { transform: translateY(-2px); }
    .reveal { opacity: 0; transform: translateY(12px); transition: opacity .55s ease, transform .55s ease; }
    .reveal.is-visible { opacity: 1; transform: none; }
    @keyframes drift { 50% { transform: rotate(-8deg) translateY(8px); } }
    @media (max-width: 1050px) {
      .nav-row { gap: 10px; }
      .nav-links { display: none; position: absolute; top: 100%; left: 0; right: 0; padding: 10px 20px 16px; align-items: stretch; flex-direction: column; background: var(--paper); border-bottom: 1px solid var(--line); }
      .nav-links.is-open { display: flex; }
      .nav-links a { padding: 9px 0; border-bottom: 1px solid var(--line); }
      .menu-toggle { display: inline-grid; place-items: center; margin-left: auto; }
      .nav-cta { min-height: 40px; padding: 8px 12px; font-size: 13px; }
    }
    @media (max-width: 760px) {
      .container { width: min(var(--container), calc(100% - 30px)); }
      .hero { padding: 56px 0 34px; }
      .hero::before { right: -90px; top: 18px; }
      .hero::after { right: 8%; bottom: 16px; width: 48px; height: 48px; }
      .hero-copy { font-size: 16px; }
      .quick-stats { grid-template-columns: 1fr 1fr; row-gap: 12px; margin-top: 36px; }
      .stat:nth-child(3) { padding-left: 0; border-left: 0; }
      section { padding: 52px 0; }
      .intro-layout, .contact-grid { grid-template-columns: 1fr; gap: 30px; }
      .capability-grid { grid-template-columns: 1fr 1fr; }
      .service-list { grid-template-columns: 1fr 1fr; gap: 0 18px; }
      .flow { grid-template-columns: 1fr 1fr; }
      .case-grid, .quote-grid { grid-template-columns: 1fr 1fr; gap: 18px; }
      .price-panel { grid-template-columns: 1fr; }
      .join-strip { align-items: flex-start; flex-direction: column; }
      .footer-row { align-items: flex-start; flex-direction: column; }
    }
    @media (max-width: 480px) {
      .ai-page-logo { width: 112px; }
      .nav-row { min-height: 64px; }
      .nav-cta { font-size: 12px; padding-inline: 9px; }
      h1 { font-size: 42px; }
      .quick-stats { grid-template-columns: 1fr 1fr; }
      .stat, .stat + .stat { padding: 12px 8px 0 0; }
      .marker-list, .capability-grid, .service-list, .flow, .case-grid, .quote-grid { grid-template-columns: 1fr; }
      .funnel-row { grid-template-columns: 86px 1fr; padding: 13px; }
      .funnel-row:nth-child(n) { margin-inline: 0; }
      .form-grid { grid-template-columns: 1fr; }
      .field-wide, .form-submit { grid-column: auto; }
      .review-score { align-items: flex-start; flex-direction: column; }
      .floating-contact { right: 10px; bottom: 10px; }
      .floating-contact a { min-height: 38px; padding: 7px 10px; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
      .reveal { opacity: 1; transform: none; }
    }