:root {
      color-scheme: light;
      --ink: #17202b;
      --muted: #596575;
      --line: #dce3ea;
      --paper: #f6f8fb;
      --white: #ffffff;
      --teal: #00a994;
      --lime: #c9ef49;
      --violet: #7657e8;
      --coral: #f2775d;
      --dark: #17232c;
      --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: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
      line-height: 1.65;
    }
    a { color: inherit; }
    button, input, select, textarea { font: inherit; }
    .container { width: min(var(--container), calc(100% - 40px)); margin-inline: auto; }
    .site-header {
      position: sticky; top: 0; z-index: 20;
      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: 22px; }
    .brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 800; white-space: nowrap; }
    .ai-page-logo { width: 36px; max-width: 100%; height: auto; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; gap: 0; }
    .nav-links a { padding: 10px 8px; color: #374453; font-size: 13px; text-decoration: none; white-space: nowrap; }
    .nav-links a:hover { color: #008a78; }
    .nav-cta, .button {
      display: inline-flex; align-items: center; justify-content: center; gap: 8px;
      padding: 11px 17px; border: 1px solid transparent; border-radius: 5px;
      background: var(--teal); color: #fff; 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 22px rgba(0,169,148,.2); background: #008f7d; }
    .menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); background: white; border-radius: 4px; color: var(--ink); }
    .hero { overflow: hidden; background: var(--dark); color: #f7fafb; }
    .hero-inner { position: relative; padding: 68px 0 50px; }
    .hero-inner::before {
      content: ""; position: absolute; width: 300px; height: 300px; right: 8%; top: 10px;
      border: 1px solid rgba(201,239,73,.34); border-radius: 50%;
      box-shadow: 0 0 0 28px rgba(201,239,73,.035), 0 0 0 58px rgba(0,210,178,.035);
      animation: orbit 16s linear infinite;
    }
    .hero-inner::after { content: ""; position: absolute; width: 8px; height: 8px; right: calc(8% + 35px); top: 52px; border-radius: 50%; background: var(--lime); box-shadow: 0 0 20px var(--lime); }
    .hero-copy { position: relative; z-index: 1; max-width: 680px; }
    .eyebrow { color: var(--lime); font-size: 12px; font-weight: 800; letter-spacing: 1px; text-transform: uppercase; }
    h1 { max-width: 660px; margin: 15px 0 18px; font-size: clamp(38px, 5vw, 62px); line-height: 1.12; letter-spacing: 0; }
    .hero-copy p { max-width: 620px; margin: 0; color: #cbd5d9; font-size: 17px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 27px; }
    .button-lime { background: var(--lime); color: #17202b; }
    .button-lime:hover { background: #d9fa70; }
    .button-outline { color: white; border-color: #68767e; background: transparent; }
    .button-outline:hover { background: #26343d; }
    .hero-proof { position: relative; z-index: 1; display: flex; flex-wrap: wrap; gap: 8px 24px; margin-top: 37px; color: #d7e0e2; font-size: 13px; }
    .hero-proof span::before { content: "✓"; margin-right: 8px; color: var(--lime); font-weight: 800; }
    .signal-strip { border-bottom: 1px solid var(--line); background: #fff; }
    .signal-inner { display: grid; grid-template-columns: repeat(4, 1fr); }
    .signal { padding: 20px 18px; border-right: 1px solid var(--line); }
    .signal:last-child { border: 0; }
    .signal strong { display: block; font-size: 18px; line-height: 1.3; }
    .signal span { color: var(--muted); font-size: 12px; }
    section.content-section { padding: 66px 0; }
    .section-head { max-width: 720px; margin-bottom: 28px; }
    .section-kicker { color: #008d7c; font-size: 12px; font-weight: 800; text-transform: uppercase; letter-spacing: 1px; }
    h2 { margin: 6px 0 10px; font-size: clamp(27px, 3vw, 38px); line-height: 1.2; }
    .section-head p, .lead { color: var(--muted); margin: 0; }
    .intro-layout { display: grid; grid-template-columns: 1.1fr .9fr; gap: 44px; align-items: start; }
    .intro-layout p { color: var(--muted); margin: 0 0 15px; }
    .intro-aside { padding: 22px 24px; border-left: 4px solid var(--teal); background: #e8f5f2; }
    .intro-aside strong { display: block; margin-bottom: 7px; }
    .intro-aside p { margin: 0; font-size: 14px; }
    .service-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
    .service-item { padding: 19px; background: var(--white); border: 1px solid var(--line); border-top: 3px solid var(--teal); transition: transform .2s, box-shadow .2s; }
    .service-item:nth-child(3n+2) { border-top-color: var(--violet); }
    .service-item:nth-child(3n) { border-top-color: var(--coral); }
    .service-item:hover { transform: translateY(-4px); box-shadow: 0 12px 26px rgba(23,32,43,.08); }
    .service-item h3 { margin: 0 0 7px; font-size: 16px; }
    .service-item p { margin: 0; color: var(--muted); font-size: 13px; }
    .workflow { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid #aeb9c4; }
    .step { position: relative; padding: 23px 20px 8px 0; }
    .step::before { content: ""; position: absolute; top: -5px; left: 0; width: 9px; height: 9px; border-radius: 50%; background: var(--teal); box-shadow: 0 0 0 4px var(--paper); }
    .step b { display: block; margin-bottom: 5px; }
    .step p { margin: 0; color: var(--muted); font-size: 13px; }
    .band-dark { background: var(--dark); color: #f7fafb; }
    .band-dark .section-kicker { color: var(--lime); }
    .band-dark .section-head p { color: #bfccd1; }
    .model-list { display: flex; flex-wrap: wrap; gap: 9px; }
    .model-list span { padding: 7px 12px; border: 1px solid #46545c; color: #e1e8e9; font-size: 13px; }
    .use-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 28px; }
    .use-item { display: flex; gap: 14px; padding: 16px 0; border-bottom: 1px solid var(--line); }
    .use-index { color: #008d7c; font-size: 12px; font-weight: 800; min-width: 28px; }
    .use-item strong { display: block; margin-bottom: 2px; }
    .use-item p { color: var(--muted); margin: 0; font-size: 13px; }
    .review-score { display: flex; align-items: center; gap: 20px; padding: 20px 0 26px; border-bottom: 1px solid var(--line); }
    .score { font-size: 42px; line-height: 1; font-weight: 800; }
    .stars { color: #dda800; letter-spacing: 0; }
    .review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 20px; }
    .review { padding: 18px; background: white; border: 1px solid var(--line); }
    .review p { margin: 0 0 12px; color: #3f4a56; font-size: 14px; }
    .review small { color: var(--muted); }
    .compare-wrap { overflow-x: auto; border: 1px solid var(--line); background: white; }
    table { width: 100%; min-width: 670px; border-collapse: collapse; text-align: left; }
    th, td { padding: 13px 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
    th { background: #edf2f4; font-size: 13px; }
    td { color: #3f4a56; font-size: 13px; }
    td:first-child { font-weight: 700; color: var(--ink); }
    .compare-note { margin-top: 12px; color: var(--muted); font-size: 12px; }
    .case-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 18px; align-items: stretch; }
    .case-feature { padding: 26px; background: #e6f7f2; border-left: 4px solid var(--teal); }
    .case-feature h3 { margin: 0 0 9px; }
    .case-feature p { margin: 0; color: #43534f; }
    .case-side { display: grid; gap: 12px; }
    .case-side div { padding: 17px 19px; background: white; border: 1px solid var(--line); }
    .case-side strong { display: block; }
    .case-side span { color: var(--muted); font-size: 13px; }
    .resource-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 36px; }
    .resource-grid h3 { margin: 0 0 12px; }
    .article-links { display: grid; gap: 8px; }
    .article-links a { padding: 10px 0; border-bottom: 1px solid var(--line); color: #344553; text-decoration: none; }
    .article-links a:hover { color: #008d7c; }
    .resource-images { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
    .resource-images figure { margin: 0; }
    .resource-images img { display: block; width: 100%; height: auto; border: 1px solid var(--line); }
    .resource-images figcaption { padding-top: 5px; color: var(--muted); font-size: 12px; }
    .faq-list { border-top: 1px solid var(--line); }
    .faq-list details { border-bottom: 1px solid var(--line); }
    .faq-list summary { padding: 16px 30px 16px 0; cursor: pointer; font-weight: 700; list-style: none; position: relative; }
    .faq-list summary::-webkit-details-marker { display: none; }
    .faq-list summary::after { content: "+"; position: absolute; right: 2px; color: #008d7c; font-size: 21px; top: 10px; }
    .faq-list details[open] summary::after { content: "−"; }
    .faq-list details p { margin: 0 0 16px; max-width: 820px; color: var(--muted); font-size: 14px; }
    .contact-section { background: #e9f0f2; }
    .contact-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 42px; align-items: start; }
    .contact-info p { color: var(--muted); }
    .contact-info a { color: #007d70; }
    .contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 13px; }
    .field { display: grid; gap: 6px; }
    .field-full { grid-column: 1 / -1; }
    .field label { font-size: 13px; font-weight: 700; }
    .field input, .field select, .field textarea { width: 100%; padding: 11px 12px; border: 1px solid #cbd5dc; border-radius: 3px; background: white; color: var(--ink); }
    .field textarea { min-height: 112px; resize: vertical; }
    .form-submit { grid-column: 1 / -1; justify-self: start; cursor: pointer; }
    .footer { padding: 25px 0; background: #fff; color: #34404c; border-top: 1px solid var(--line); }
    .footer-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 25px; }
    .footer p { margin: 8px 0 0; color: #596575; font-size: 13px; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 8px 16px; max-width: 650px; }
    .footer-links a { color: #34404c; font-size: 12px; text-decoration: none; }
    .footer-bottom { margin-top: 18px; padding-top: 13px; border-top: 1px solid var(--line); color: #596575; font-size: 12px; }
    .floating-contact { position: fixed; z-index: 15; right: 16px; bottom: 18px; display: grid; gap: 8px; }
    .floating-contact a { padding: 10px 13px; border: 1px solid var(--line); background: white; color: var(--ink); box-shadow: 0 4px 14px rgba(0,0,0,.1); text-decoration: none; font-size: 12px; }
    .floating-contact a:first-child { background: var(--teal); color: white; border-color: var(--teal); }
    .reveal { opacity: 0; transform: translateY(12px); transition: opacity .5s ease, transform .5s ease; }
    .reveal.is-visible { opacity: 1; transform: translateY(0); }
    @keyframes orbit { to { transform: rotate(360deg); } }
    @media (max-width: 1050px) {
      .nav-links a { padding-inline: 5px; font-size: 12px; }
      .nav-cta { padding: 9px 12px; font-size: 12px; }
      .service-grid { grid-template-columns: repeat(3, 1fr); }
    }
    @media (max-width: 820px) {
      .header-inner { min-height: 64px; }
      .menu-toggle { display: inline-flex; align-items: center; justify-content: center; }
      .nav-links { display: none; position: absolute; top: 64px; left: 0; right: 0; padding: 10px 20px 16px; background: white; border-bottom: 1px solid var(--line); align-items: stretch; flex-direction: column; }
      .nav-links.is-open { display: flex; }
      .nav-links a { padding: 9px 0; font-size: 14px; border-bottom: 1px solid #edf0f3; }
      .nav-cta { display: none; }
      .hero-inner { padding: 55px 0 39px; }
      .hero-inner::before { right: -150px; opacity: .7; }
      .signal-inner { grid-template-columns: repeat(2, 1fr); }
      .signal:nth-child(2) { border-right: 0; }
      .signal:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
      .intro-layout, .contact-grid { grid-template-columns: 1fr; gap: 25px; }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .review-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 560px) {
      .container { width: min(var(--container), calc(100% - 30px)); }
      .hero-inner { padding-top: 44px; }
      h1 { font-size: 39px; }
      .hero-copy p { font-size: 15px; }
      section.content-section { padding: 48px 0; }
      .signal { padding: 15px 10px; }
      .signal strong { font-size: 16px; }
      .service-grid, .use-grid, .workflow, .review-grid, .case-grid, .resource-grid { grid-template-columns: 1fr; }
      .workflow { border-top: 0; border-left: 1px solid #aeb9c4; margin-left: 4px; }
      .step { padding: 2px 0 22px 19px; }
      .step::before { top: 6px; left: -5px; }
      .review-score { align-items: flex-start; }
      .resource-images { grid-template-columns: 1fr 1fr; }
      .contact-form { grid-template-columns: 1fr; }
      .field-full, .form-submit { grid-column: auto; }
      .footer-top { flex-direction: column; }
      .floating-contact { right: 10px; bottom: 10px; }
      .floating-contact a { padding: 8px 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; }
    }