:root {
      color-scheme: light;
      --ink: #201b2c;
      --muted: #6c6878;
      --paper: #fbfaff;
      --line: #e8e3ef;
      --violet: #6842d8;
      --violet-dark: #4525a9;
      --pink: #ee4fa3;
      --mint: #d9f4e9;
      --lime: #d5ed70;
      --container: 1160px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      background: var(--paper);
      color: var(--ink);
      font: 16px/1.65 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    }
    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(251,250,255,.94); border-bottom: 1px solid rgba(232,227,239,.9); backdrop-filter: blur(14px); }
    .nav-row { display: flex; align-items: center; justify-content: space-between; gap: 20px; min-height: 74px; }
    .brand { display: inline-flex; align-items: center; gap: 11px; flex: 0 0 auto; font-weight: 800; }
    .ai-page-logo { display: block; width: 38px; height: 38px; object-fit: contain; }
    .brand-name { font-size: 18px; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; gap: 0; flex-wrap: wrap; }
    .nav-links a { padding: 10px 9px; color: #514b5e; font-size: 13px; transition: color .2s ease; }
    .nav-links a:hover { color: var(--violet); }
    .nav-cta, .button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 0; border-radius: 5px; padding: 12px 18px; background: var(--violet); color: #fff; font-weight: 700; transition: transform .2s ease, background .2s ease, box-shadow .2s ease; }
    .nav-cta:hover, .button:hover { transform: translateY(-2px); background: var(--violet-dark); box-shadow: 0 9px 22px rgba(82,49,177,.2); }
    .menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 5px; background: #fff; color: var(--ink); cursor: pointer; }
    .hero { position: relative; overflow: hidden; padding: 78px 0 48px; background: linear-gradient(135deg,#f5efff 0%,#fff9fd 57%,#effaf6 100%); }
    .hero::before { content: ""; position: absolute; width: 430px; height: 430px; right: -140px; top: -190px; border: 1px solid rgba(104,66,216,.16); border-radius: 50%; box-shadow: 0 0 0 38px rgba(104,66,216,.035), 0 0 0 78px rgba(238,79,163,.025); }
    .hero-inner { position: relative; max-width: 840px; }
    .eyebrow { display: inline-flex; align-items: center; gap: 8px; margin: 0 0 18px; color: var(--violet-dark); font-size: 13px; font-weight: 800; }
    .eyebrow::before { content: ""; width: 22px; height: 2px; background: var(--pink); }
    h1 { max-width: 760px; margin: 0; font-size: clamp(38px, 6vw, 68px); line-height: 1.12; }
    .hero-copy { max-width: 680px; margin: 22px 0 28px; color: #5c5669; font-size: 18px; }
    .hero-actions { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
    .button.secondary { border: 1px solid #d8ccef; background: #fff; color: var(--violet-dark); box-shadow: none; }
    .button.secondary:hover { background: #f4efff; }
    .hero-note { margin: 17px 0 0; color: var(--muted); font-size: 13px; }
    .hero-strip { position: relative; display: grid; grid-template-columns: repeat(4,1fr); gap: 1px; margin-top: 48px; border: 1px solid rgba(216,204,239,.8); background: rgba(216,204,239,.8); }
    .hero-stat { padding: 18px 20px; background: rgba(255,255,255,.76); }
    .hero-stat strong { display: block; font-size: 17px; }
    .hero-stat span { color: var(--muted); font-size: 13px; }
    main { overflow: hidden; }
    section.content-section { padding: 70px 0; }
    .section-heading { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 28px; }
    .section-heading h2 { margin: 0; font-size: clamp(28px,4vw,40px); line-height: 1.2; }
    .section-heading p { max-width: 520px; margin: 0; color: var(--muted); }
    .kicker { margin: 0 0 8px; color: var(--violet); font-size: 12px; font-weight: 800; text-transform: uppercase; }
    .intro-band { border-bottom: 1px solid var(--line); background: #fff; }
    .intro-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 54px; align-items: start; }
    .intro-copy h2 { max-width: 500px; margin: 0 0 18px; font-size: 34px; line-height: 1.25; }
    .intro-copy p { margin: 0 0 15px; color: var(--muted); }
    .intro-points { display: grid; grid-template-columns: repeat(2,1fr); gap: 0 22px; margin: 0; padding: 0; list-style: none; }
    .intro-points li { padding: 14px 0; border-top: 1px solid var(--line); font-weight: 700; }
    .intro-points li span { display: block; margin-top: 3px; color: var(--muted); font-size: 13px; font-weight: 400; }
    .services-section { background: linear-gradient(180deg,#fbfaff,#f7f5fb); }
    .service-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 14px; }
    .service-item { min-height: 164px; padding: 20px; border: 1px solid var(--line); background: #fff; transition: transform .2s ease, border-color .2s ease, box-shadow .2s ease; }
    .service-item:hover { transform: translateY(-4px); border-color: #c8b7ef; box-shadow: 0 12px 28px rgba(46,31,75,.08); }
    .service-mark { display: inline-grid; place-items: center; width: 32px; height: 32px; margin-bottom: 15px; border-radius: 4px; background: #f0eaff; color: var(--violet-dark); font-size: 14px; font-weight: 800; }
    .service-item h3 { margin: 0 0 7px; font-size: 17px; }
    .service-item p { margin: 0; color: var(--muted); font-size: 13px; }
    .workflow { display: grid; grid-template-columns: repeat(4,1fr); gap: 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
    .workflow article { position: relative; padding: 24px 22px 24px 0; }
    .workflow article + article { padding-left: 22px; border-left: 1px solid var(--line); }
    .step-no { color: var(--pink); font-size: 12px; font-weight: 800; }
    .workflow h3 { margin: 8px 0; font-size: 18px; }
    .workflow p { margin: 0; color: var(--muted); font-size: 14px; }
    .industry-section { background: #f0f9f5; }
    .industry-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 48px; align-items: start; }
    .industry-layout h2 { margin: 0 0 16px; font-size: 34px; }
    .industry-layout p { color: var(--muted); }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 9px; }
    .tag-cloud span { padding: 8px 12px; border: 1px solid #d5e9df; background: #fff; color: #314f43; font-size: 13px; }
    .platform-list { margin-top: 25px; padding-top: 18px; border-top: 1px solid #d4e5dc; color: #4f5f57; font-size: 14px; }
    .network { display: grid; grid-template-columns: 1.1fr .9fr; gap: 32px; align-items: center; padding: 28px; background: #2b2140; color: #fff; }
    .network h2 { margin: 0 0 12px; font-size: 30px; }
    .network p { margin: 0; color: #e2daef; }
    .network-detail { padding-left: 24px; border-left: 1px solid #675b78; }
    .network-detail strong { color: #d5ed70; font-size: 18px; }
    .network-detail p { margin-top: 6px; font-size: 14px; }
    .showcase-section { background: #fff; }
    .showcase-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
    .showcase-card { overflow: hidden; border: 1px solid var(--line); background: #fff; }
    .media-frame { display: grid; place-items: center; aspect-ratio: 16 / 8; overflow: hidden; background: #f3eff9; }
    .media-frame img { display: block; width: 100%; height: 100%; object-fit: cover; }
    .media-frame.square { aspect-ratio: 1 / 1; }
    .showcase-text { padding: 18px 20px; }
    .showcase-text h3 { margin: 0 0 6px; font-size: 19px; }
    .showcase-text p { margin: 0; color: var(--muted); font-size: 14px; }
    .comparison-section { background: #f4f0fa; }
    .score-panel { display: flex; align-items: center; gap: 18px; margin-bottom: 22px; padding: 18px 22px; border-left: 4px solid var(--pink); background: #fff; }
    .score-value { color: var(--violet-dark); font-size: 38px; font-weight: 850; line-height: 1; }
    .stars { color: #d58d00; letter-spacing: 0; font-size: 19px; }
    .score-panel p { margin: 3px 0 0; color: var(--muted); font-size: 13px; }
    .table-wrap { overflow-x: auto; border: 1px solid var(--line); background: #fff; }
    table { width: 100%; min-width: 680px; border-collapse: collapse; text-align: left; }
    th, td { padding: 14px 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
    th { background: #f7f4fc; font-size: 13px; }
    td { color: #514b5e; font-size: 14px; }
    tr:last-child td { border-bottom: 0; }
    .highlight { color: var(--violet-dark); font-weight: 750; }
    .testimonials { display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; }
    .quote { padding: 20px; border-top: 2px solid var(--violet); background: #fff; }
    .quote p { margin: 0 0 17px; color: #4f4959; font-size: 14px; }
    .quote strong { display: block; font-size: 14px; }
    .quote span { color: var(--muted); font-size: 12px; }
    .articles-section { background: #fff; }
    .article-links { display: grid; grid-template-columns: repeat(5,1fr); gap: 12px; }
    .article-links a { display: flex; min-height: 88px; align-items: end; padding: 15px; border: 1px solid var(--line); background: #fbfaff; color: var(--violet-dark); font-weight: 700; transition: background .2s ease, transform .2s ease; }
    .article-links a:hover { transform: translateY(-3px); background: #f1ebff; }
    .faq-section { background: #faf8fd; }
    .faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: 0 26px; border-top: 1px solid var(--line); }
    details { border-bottom: 1px solid var(--line); }
    summary { position: relative; padding: 17px 28px 17px 0; cursor: pointer; font-weight: 700; list-style: none; }
    summary::-webkit-details-marker { display: none; }
    summary::after { content: "+"; position: absolute; top: 14px; right: 0; color: var(--violet); font-size: 22px; font-weight: 400; }
    details[open] summary::after { content: "−"; }
    details p { margin: -4px 0 17px; color: var(--muted); font-size: 14px; }
    .contact-section { padding: 70px 0; background: linear-gradient(135deg,#eee7fb,#f3faf6); }
    .contact-layout { display: grid; grid-template-columns: .85fr 1.15fr; gap: 46px; align-items: start; }
    .contact-copy h2 { margin: 0 0 12px; font-size: 36px; }
    .contact-copy > p { color: var(--muted); }
    .contact-list { margin: 24px 0 0; padding: 0; list-style: none; }
    .contact-list li { padding: 9px 0; border-bottom: 1px solid rgba(104,66,216,.15); }
    .contact-list a { color: var(--violet-dark); font-weight: 700; }
    .contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; padding: 22px; border: 1px solid #e4dcef; background: #fff; }
    .field { display: grid; gap: 6px; }
    .field.full { grid-column: 1 / -1; }
    .field label { color: #4d465a; font-size: 13px; font-weight: 700; }
    .field input, .field select, .field textarea { width: 100%; border: 1px solid #dcd6e5; border-radius: 3px; padding: 11px 12px; background: #fff; color: var(--ink); outline: none; }
    .field input:focus, .field select:focus, .field textarea:focus { border-color: var(--violet); box-shadow: 0 0 0 3px rgba(104,66,216,.1); }
    .field textarea { min-height: 112px; resize: vertical; }
    .form-note { grid-column: 1 / -1; margin: 0; color: var(--muted); font-size: 12px; }
    .contact-form .button { justify-self: start; cursor: pointer; }
    .site-footer { padding: 30px 0; border-top: 1px solid var(--line); background: #fff; color: #4f4959; }
    .footer-top { display: flex; justify-content: space-between; align-items: start; gap: 24px; }
    .footer-brand p { max-width: 500px; margin: 8px 0 0; color: var(--muted); font-size: 13px; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 8px 16px; justify-content: flex-end; font-size: 13px; }
    .footer-links a { color: var(--violet-dark); }
    .copyright { margin: 22px 0 0; padding-top: 14px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
    .floating-help { position: fixed; z-index: 15; right: 18px; bottom: 22px; display: grid; gap: 8px; }
    .floating-help a, .to-top { display: grid; place-items: center; min-width: 48px; min-height: 45px; padding: 7px 10px; border: 1px solid #ddd3ef; border-radius: 4px; background: #fff; color: var(--violet-dark); box-shadow: 0 5px 18px rgba(32,27,44,.12); font-size: 12px; font-weight: 750; }
    .to-top { cursor: pointer; }
    .reveal { opacity: 0; transform: translateY(14px); transition: opacity .55s ease, transform .55s ease; }
    .reveal.visible { opacity: 1; transform: translateY(0); }
    @media (max-width: 1000px) {
      .nav-links a { padding-inline: 6px; font-size: 12px; }
      .nav-cta { padding: 10px 12px; font-size: 13px; }
      .service-grid { grid-template-columns: repeat(3,1fr); }
    }
    @media (max-width: 760px) {
      .container { width: min(var(--container), calc(100% - 32px)); }
      .nav-row { min-height: 66px; }
      .menu-toggle { display: inline-grid; place-items: center; margin-left: auto; }
      .nav-cta { display: none; }
      .nav-links { display: none; position: absolute; top: 65px; left: 0; right: 0; padding: 10px 16px 15px; border-bottom: 1px solid var(--line); background: #fff; box-shadow: 0 12px 20px rgba(32,27,44,.08); }
      .nav-links.open { display: grid; grid-template-columns: 1fr 1fr; }
      .nav-links a { padding: 10px; font-size: 14px; }
      .hero { padding: 58px 0 34px; }
      .hero-copy { font-size: 16px; }
      .hero-strip { grid-template-columns: 1fr 1fr; margin-top: 35px; }
      section.content-section, .contact-section { padding: 54px 0; }
      .section-heading { display: block; }
      .section-heading p { margin-top: 12px; }
      .intro-grid, .industry-layout, .network, .contact-layout { grid-template-columns: 1fr; gap: 28px; }
      .intro-copy h2, .industry-layout h2 { font-size: 30px; }
      .service-grid { grid-template-columns: repeat(2,1fr); }
      .workflow { grid-template-columns: 1fr 1fr; }
      .workflow article { padding: 19px 14px 19px 0; }
      .workflow article + article { padding-left: 14px; }
      .workflow article:nth-child(3) { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
      .workflow article:nth-child(4) { border-top: 1px solid var(--line); }
      .network-detail { padding: 18px 0 0; border-left: 0; border-top: 1px solid #675b78; }
      .testimonials { grid-template-columns: repeat(2,1fr); }
      .article-links { grid-template-columns: repeat(2,1fr); }
      .faq-list { grid-template-columns: 1fr; }
      .footer-top { display: block; }
      .footer-links { justify-content: flex-start; margin-top: 18px; }
    }
    @media (max-width: 480px) {
      .hero-strip { grid-template-columns: 1fr 1fr; }
      .hero-stat { padding: 14px; }
      .service-grid, .testimonials, .showcase-grid { grid-template-columns: 1fr; }
      .service-item { min-height: 0; }
      .intro-points { grid-template-columns: 1fr; }
      .contact-form { grid-template-columns: 1fr; padding: 17px; }
      .field.full, .form-note { grid-column: auto; }
      .score-panel { align-items: flex-start; }
      .floating-help { right: 9px; bottom: 12px; }
      .floating-help a, .to-top { min-width: 42px; min-height: 41px; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
      .reveal { opacity: 1; transform: none; }
    }