:root {
      color-scheme: light;
      --ink: #20243a;
      --muted: #646b7f;
      --line: #e5e8f0;
      --paper: #f7f8fc;
      --white: #fff;
      --violet: #654fe3;
      --coral: #ef6a58;
      --mint: #1a9b81;
      --blue: #3678d5;
      --yellow: #efb949;
      --shadow: 0 14px 38px rgba(36, 42, 75, .08);
      --content: 1160px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; scroll-padding-top: 82px; }
    body {
      margin: 0;
      background: var(--paper);
      color: var(--ink);
      font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
      line-height: 1.65;
    }
    a { color: inherit; text-decoration: none; }
    button, input, select, textarea { font: inherit; }
    img { max-width: 100%; }
    .container { width: min(var(--content), calc(100% - 40px)); margin-inline: auto; }
    .site-header {
      position: sticky; top: 0; z-index: 30;
      background: rgba(255,255,255,.94);
      border-bottom: 1px solid var(--line);
      backdrop-filter: blur(14px);
    }
    .header-inner { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
    .brand { display: inline-flex; align-items: center; flex: 0 0 auto; }
    .ai-page-logo { max-width:100%; height:auto; width: 142px; display:block; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; gap: 0; }
    .nav-links a { padding: 10px 11px; color: #4b5063; font-size: 13px; white-space: nowrap; transition: color .2s ease; }
    .nav-links a:hover { color: var(--violet); }
    .nav-cta, .button {
      display: inline-flex; justify-content: center; align-items: center; gap: 9px;
      border: 0; border-radius: 6px; padding: 12px 18px;
      background: var(--violet); color: white; font-weight: 700; cursor: pointer;
      box-shadow: 0 7px 18px rgba(101,79,227,.22);
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    }
    .nav-cta { margin-left: 12px; padding: 10px 15px; font-size: 13px; white-space: nowrap; }
    .button:hover, .nav-cta:hover { transform: translateY(-2px); box-shadow: 0 11px 24px rgba(101,79,227,.28); }
    .button.secondary { background: var(--white); color: var(--ink); border: 1px solid var(--line); box-shadow: none; }
    .menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 6px; background: white; color: var(--ink); cursor: pointer; }
    .menu-toggle svg { width: 20px; height: 20px; vertical-align: middle; }
    .hero {
      position: relative; overflow: hidden; padding: 88px 0 64px;
      background: linear-gradient(120deg, #f8f7ff 0%, #fff 50%, #f1fbf8 100%);
      border-bottom: 1px solid var(--line);
    }
    .hero::before {
      content: ""; position: absolute; width: 370px; height: 370px; right: -100px; top: -185px;
      border: 1px solid rgba(101,79,227,.14); border-radius: 50%;
      box-shadow: 0 0 0 34px rgba(101,79,227,.035), 0 0 0 70px rgba(26,155,129,.035);
      animation: orbit 22s linear infinite;
    }
    .hero-inner { position: relative; display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(280px, .85fr); gap: 48px; align-items: center; }
    .eyebrow { display: inline-flex; align-items: center; gap: 9px; color: var(--violet); font-size: 13px; font-weight: 750; letter-spacing: 0; }
    .eyebrow::before { content: ""; width: 22px; height: 2px; background: var(--coral); }
    h1 { max-width: 700px; margin: 18px 0 18px; font-size: clamp(40px, 5.2vw, 64px); line-height: 1.12; letter-spacing: 0; }
    .hero-copy { max-width: 620px; margin: 0; color: var(--muted); font-size: 17px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
    .hero-note { margin-top: 17px; color: #74798a; font-size: 12px; }
    .hero-visual { position: relative; padding: 22px; border: 1px solid #e5e3f4; border-radius: 8px; background: rgba(255,255,255,.82); box-shadow: var(--shadow); }
    .visual-top { display: flex; justify-content: space-between; align-items: center; padding-bottom: 17px; border-bottom: 1px solid var(--line); font-size: 13px; font-weight: 750; }
    .live-mark { display: inline-flex; align-items: center; gap: 7px; color: var(--mint); font-size: 11px; font-weight: 700; }
    .live-mark::before { content:""; width: 7px; height: 7px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 0 4px rgba(26,155,129,.12); }
    .model-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; padding-top: 16px; }
    .model-item { display: flex; align-items: center; gap: 10px; padding: 12px; border: 1px solid var(--line); border-radius: 5px; background: white; font-size: 12px; font-weight: 650; }
    .model-dot { width: 27px; height: 27px; display:grid; place-items:center; border-radius: 5px; color: white; font-size: 11px; font-weight: 800; }
    .model-item:nth-child(4n+1) .model-dot { background: var(--violet); }
    .model-item:nth-child(4n+2) .model-dot { background: var(--coral); }
    .model-item:nth-child(4n+3) .model-dot { background: var(--mint); }
    .model-item:nth-child(4n) .model-dot { background: var(--blue); }
    .visual-foot { display: flex; justify-content: space-between; gap: 14px; margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--line); color: var(--muted); font-size: 11px; }
    .metric-strip { display: grid; grid-template-columns: repeat(4,1fr); gap: 0; margin-top: 52px; border: 1px solid var(--line); border-radius: 6px; background: white; }
    .metric { padding: 19px 22px; border-right: 1px solid var(--line); }
    .metric:last-child { border-right: 0; }
    .metric strong { display:block; color: var(--ink); font-size: 18px; line-height: 1.3; }
    .metric span { color: var(--muted); font-size: 12px; }
    main { overflow: hidden; }
    .section { padding: 76px 0; }
    .section.tinted { background: #f0f2f9; border-block: 1px solid #e8eaf1; }
    .section-heading { display: flex; justify-content: space-between; align-items: end; gap: 28px; margin-bottom: 30px; }
    .section-heading > div { max-width: 690px; }
    .section-kicker { margin: 0 0 8px; color: var(--violet); font-size: 12px; font-weight: 800; }
    h2 { margin: 0; font-size: clamp(27px, 3vw, 38px); line-height: 1.2; letter-spacing: 0; }
    .section-intro { margin: 12px 0 0; color: var(--muted); }
    h3 { margin: 0; font-size: 17px; line-height: 1.4; }
    .intro-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 54px; align-items: start; }
    .intro-copy p { margin: 0 0 14px; color: var(--muted); }
    .feature-lines { border-top: 1px solid var(--line); }
    .feature-line { display: grid; grid-template-columns: 34px 1fr; gap: 13px; padding: 16px 0; border-bottom: 1px solid var(--line); }
    .feature-line .index { color: var(--coral); font-size: 12px; font-weight: 800; }
    .feature-line p { margin: 4px 0 0; color: var(--muted); font-size: 13px; }
    .service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; }
    .service-card { min-width: 0; padding: 21px; border: 1px solid var(--line); border-radius: 6px; background: white; transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease; }
    .service-card:hover { transform: translateY(-4px); border-color: #ccc5f6; box-shadow: var(--shadow); }
    .service-card p { margin: 9px 0 0; color: var(--muted); font-size: 13px; }
    .service-label { display: inline-flex; margin-top: 16px; color: var(--violet); font-size: 11px; font-weight: 750; }
    .workflow { display: grid; grid-template-columns: repeat(4,1fr); gap: 0; counter-reset: flow; }
    .step { position: relative; padding: 0 24px 0 0; counter-increment: flow; }
    .step:not(:last-child)::after { content: ""; position: absolute; left: 42px; right: 18px; top: 20px; height: 1px; background: #d8dbe7; }
    .step-number { position: relative; z-index: 1; width: 42px; height: 42px; display: grid; place-items: center; border: 1px solid #d9d4f8; border-radius: 50%; background: white; color: var(--violet); font-size: 12px; font-weight: 800; }
    .step h3 { margin-top: 16px; }
    .step p { margin: 7px 0 0; color: var(--muted); font-size: 13px; }
    .solution-list { display: grid; grid-template-columns: 1fr 1fr; gap: 0 44px; }
    .solution { display: grid; grid-template-columns: 38px 1fr; gap: 13px; padding: 18px 0; border-bottom: 1px solid var(--line); }
    .solution-mark { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 5px; background: #ece9ff; color: var(--violet); font-size: 14px; font-weight: 800; }
    .solution p { margin: 5px 0 0; color: var(--muted); font-size: 13px; }
    .network { display: flex; flex-wrap: wrap; gap: 9px; }
    .network span { padding: 8px 13px; border: 1px solid var(--line); border-radius: 4px; background: white; color: #42485a; font-size: 13px; }
    .network span:nth-child(4n+1) { border-color: #d7d0fb; background:#f1efff; }
    .network span:nth-child(4n+2) { border-color: #f4d4cf; background:#fff2ef; }
    .network span:nth-child(4n+3) { border-color: #c8e8df; background:#edfaf6; }
    .network-note { margin: 18px 0 0; color: var(--muted); font-size: 13px; }
    .showcase-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 16px; align-items: stretch; }
    .showcase { overflow: hidden; border: 1px solid var(--line); border-radius: 6px; background: white; }
    .showcase-media { overflow: hidden; aspect-ratio: 16 / 8; background: #eceef4; }
    .showcase-media.square { aspect-ratio: 1 / .72; }
    .showcase-media img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .45s ease; }
    .showcase:hover .showcase-media img { transform: scale(1.025); }
    .showcase-content { padding: 20px; }
    .showcase-content p { margin: 8px 0 0; color: var(--muted); font-size: 13px; }
    .comparison-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 6px; background: white; }
    .comparison { width: 100%; min-width: 720px; border-collapse: collapse; text-align: left; font-size: 13px; }
    .comparison th, .comparison td { padding: 14px 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
    .comparison th { background: #f3f3fb; font-weight: 750; }
    .comparison tr:last-child td { border-bottom: 0; }
    .comparison td:first-child { width: 22%; font-weight: 700; }
    .score-panel { display: flex; align-items: center; gap: 20px; margin-bottom: 20px; padding: 21px 24px; border: 1px solid #e3ddff; border-radius: 6px; background: #f2efff; }
    .score-number { color: var(--violet); font-size: 39px; font-weight: 850; line-height: 1; }
    .stars { color: #d28a11; letter-spacing: 0; font-size: 18px; }
    .score-panel p { margin: 4px 0 0; color: #555b70; font-size: 13px; }
    .reviews { display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; }
    .review { padding: 20px; border-top: 3px solid var(--mint); background: white; box-shadow: 0 5px 20px rgba(36,42,75,.045); }
    .review:nth-child(3n+2) { border-top-color: var(--coral); }
    .review:nth-child(3n) { border-top-color: var(--violet); }
    .review blockquote { margin: 0; color: #42485a; font-size: 13px; }
    .review figcaption { margin-top: 14px; color: var(--muted); font-size: 11px; }
    .review figcaption strong { display: block; color: var(--ink); font-size: 12px; }
    .resource-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 44px; }
    .article-list { border-top: 1px solid var(--line); }
    .article-row { display: flex; justify-content: space-between; align-items: center; gap: 18px; padding: 14px 0; border-bottom: 1px solid var(--line); }
    .article-row span { color: var(--ink); font-size: 13px; font-weight: 650; }
    .article-row b { color: var(--violet); font-size: 12px; }
    .article-row:hover span { color: var(--violet); }
    .knowledge-box { padding: 22px; border-radius: 6px; background: #eaf5f2; }
    .knowledge-box p { margin: 9px 0 17px; color: #53675f; font-size: 13px; }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
    .tag-cloud span { padding: 6px 10px; border-radius: 3px; background: white; color: #44544d; font-size: 11px; }
    .faq-list { border-top: 1px solid var(--line); }
    .faq-item { border-bottom: 1px solid var(--line); }
    .faq-item summary { position: relative; padding: 17px 38px 17px 0; cursor: pointer; list-style: none; font-weight: 700; }
    .faq-item summary::-webkit-details-marker { display:none; }
    .faq-item summary::after { content: "+"; position:absolute; right: 4px; top: 13px; color:var(--violet); font-size:23px; font-weight:400; }
    .faq-item[open] summary::after { content: "−"; }
    .faq-item p { max-width: 900px; margin: -4px 0 18px; color: var(--muted); font-size: 13px; }
    .contact-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 50px; align-items: start; }
    .contact-copy p { color: var(--muted); }
    .contact-detail { display: grid; gap: 11px; margin-top: 23px; }
    .contact-detail a, .contact-detail span { color: #41475a; font-size: 14px; }
    .contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; padding: 23px; border: 1px solid var(--line); border-radius: 6px; background: white; }
    .field { display: grid; gap: 6px; }
    .field.full { grid-column: 1 / -1; }
    .field label { color: #43495c; font-size: 12px; font-weight: 700; }
    .field input, .field select, .field textarea { width: 100%; min-width: 0; padding: 11px 12px; border: 1px solid #dfe2eb; border-radius: 4px; outline: none; color: var(--ink); background: #fff; }
    .field input:focus, .field select:focus, .field textarea:focus { border-color: var(--violet); box-shadow: 0 0 0 3px rgba(101,79,227,.1); }
    .field textarea { min-height: 112px; resize: vertical; }
    .form-note { grid-column: 1 / -1; margin: -4px 0 0; color: var(--muted); font-size: 11px; }
    .contact-form .button { justify-self: start; }
    .qr-wrap { display: flex; align-items: center; gap: 14px; margin-top: 18px; color: var(--muted); font-size: 12px; }
    .qr-wrap img { width: 88px; aspect-ratio: 1; object-fit: cover; border: 1px solid var(--line); border-radius: 4px; }
    .join-band { display:flex; align-items:center; justify-content:space-between; gap:24px; padding:24px 27px; border-radius:6px; background:#20243a; color:#fff; }
    .join-band h3 { color:#fff; }
    .join-band p { margin:5px 0 0; color:#d1d3de; font-size:13px; }
    .join-band .button { flex:0 0 auto; background:var(--coral); box-shadow:none; }
    .friend-links { display:flex; flex-wrap:wrap; gap:9px 20px; margin:20px 0 0; }
    .friend-links a { color:#5d6478; font-size:12px; }
    .friend-links a:hover { color:var(--violet); }
    .site-footer { padding:24px 0; background:#eef0f6; color:#454b5d; border-top:1px solid #e1e4ed; }
    .footer-inner { display:flex; justify-content:space-between; align-items:center; gap:20px; }
    .footer-inner p { margin:0; font-size:12px; }
    .footer-contact { display:flex; flex-wrap:wrap; gap:8px 18px; font-size:12px; }
    .floating { position:fixed; z-index:25; right:18px; bottom:20px; display:grid; gap:9px; }
    .float-link { width:46px; height:46px; display:grid; place-items:center; border:1px solid var(--line); border-radius:50%; background:white; color:var(--violet); box-shadow:0 6px 20px rgba(36,42,75,.12); transition:transform .2s ease; }
    .float-link:hover { transform:translateY(-3px); }
    .float-link svg { width:20px; height:20px; }
    .reveal { opacity:0; transform:translateY(14px); 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 a { padding-inline: 7px; font-size: 12px; }
      .nav-links a:nth-of-type(n+6) { display:none; }
      .hero-inner { gap:28px; }
      .service-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 760px) {
      .container { width:min(var(--content), calc(100% - 32px)); }
      .header-inner { min-height:64px; }
      .ai-page-logo { width:126px; }
      .menu-toggle { display:block; }
      .nav-cta { margin-left:auto; }
      .nav-links { display:none; position:absolute; top:64px; left:0; right:0; padding:10px 16px 15px; border-bottom:1px solid var(--line); background:white; box-shadow:0 14px 18px rgba(36,42,75,.08); }
      .nav-links.is-open { display:grid; grid-template-columns:1fr 1fr; }
      .nav-links a, .nav-links a:nth-of-type(n+6) { display:block; padding:10px; }
      .hero { padding:60px 0 42px; }
      .hero-inner { grid-template-columns:1fr; gap:30px; }
      .hero-visual { max-width:520px; }
      .metric-strip { grid-template-columns:1fr 1fr; margin-top:34px; }
      .metric { border-bottom:1px solid var(--line); }
      .metric:nth-child(2) { border-right:0; }
      .metric:nth-child(n+3) { border-bottom:0; }
      .section { padding:56px 0; }
      .section-heading { display:block; }
      .section-heading > a { display:inline-flex; margin-top:16px; }
      .intro-layout, .resource-grid, .contact-layout { grid-template-columns:1fr; gap:28px; }
      .workflow { grid-template-columns:1fr 1fr; row-gap:30px; }
      .step:nth-child(2)::after { display:none; }
      .solution-list { grid-template-columns:1fr; }
      .showcase-grid { grid-template-columns:1fr; }
      .showcase-media.square { aspect-ratio:16 / 8; }
      .reviews { grid-template-columns:1fr 1fr; }
      .footer-inner { align-items:flex-start; flex-direction:column; }
    }
    @media (max-width: 480px) {
      .header-inner { gap:9px; }
      .nav-cta { padding:9px 10px; font-size:12px; }
      h1 { font-size:40px; }
      .hero-copy { font-size:15px; }
      .hero-actions { gap:9px; }
      .button { padding:11px 14px; font-size:13px; }
      .hero-visual { padding:15px; }
      .model-grid { gap:7px; }
      .model-item { padding:9px 7px; font-size:11px; }
      .model-dot { width:24px; height:24px; }
      .metric { padding:15px 13px; }
      .metric strong { font-size:16px; }
      .service-grid, .reviews { grid-template-columns:1fr; }
      .workflow { grid-template-columns:1fr 1fr; }
      .contact-form { grid-template-columns:1fr; padding:17px; }
      .field.full, .form-note { grid-column:auto; }
      .join-band { align-items:flex-start; flex-direction:column; }
      .floating { right:10px; bottom:12px; }
      .float-link { width:42px; height:42px; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { scroll-behavior:auto !important; animation-duration:.01ms !important; transition-duration:.01ms !important; }
      .reveal { opacity:1; transform:none; }
    }