:root {
      color-scheme: light;
      --ink: #172334;
      --muted: #586779;
      --line: #dce4ed;
      --paper: #f7f9fc;
      --white: #fff;
      --blue: #175ee8;
      --cyan: #00a9b7;
      --coral: #f06a57;
      --green: #16805d;
      --shadow: 0 12px 32px rgba(30, 52, 80, .08);
      --container: 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", Arial, 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(255,255,255,.96); border-bottom: 1px solid var(--line); backdrop-filter: blur(12px); }
    .nav-row { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
    .brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 800; white-space: nowrap; }
    .ai-page-logo { width: 38px; height: 38px; object-fit: contain; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; gap: 0; flex-wrap: wrap; }
    .nav-links a { padding: 9px 10px; text-decoration: none; color: #415166; font-size: 13px; border-radius: 6px; transition: color .2s, background .2s; }
    .nav-links a:hover { color: var(--blue); background: #edf3ff; }
    .nav-links .nav-cta { margin-left: 8px; padding: 10px 15px; background: var(--blue); color: white; font-weight: 700; }
    .menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 6px; background: white; color: var(--ink); cursor: pointer; }
    .hero { position: relative; overflow: hidden; padding: 76px 0 54px; background: linear-gradient(115deg, #eaf4ff 0%, #f5fbff 48%, #fff4ef 100%); border-bottom: 1px solid #dbe7f2; }
    .hero::before { content: ""; position: absolute; inset: 0; opacity: .42; background-image: linear-gradient(rgba(35,98,164,.08) 1px, transparent 1px), linear-gradient(90deg, rgba(35,98,164,.08) 1px, transparent 1px); background-size: 38px 38px; mask-image: linear-gradient(to right, #000, transparent 75%); pointer-events: none; }
    .hero-content { position: relative; max-width: 850px; }
    .eyebrow { display: inline-flex; align-items: center; gap: 9px; color: #2856a6; font-size: 13px; font-weight: 800; }
    .eyebrow::before { content: ""; width: 23px; height: 3px; background: var(--coral); border-radius: 3px; }
    h1 { max-width: 780px; margin: 18px 0 16px; font-size: clamp(38px, 6vw, 66px); line-height: 1.12; letter-spacing: 0; }
    .hero p { max-width: 700px; color: #43566d; font-size: 18px; margin: 0; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
    .button { display: inline-flex; min-height: 46px; align-items: center; justify-content: center; gap: 8px; padding: 11px 18px; border: 1px solid transparent; border-radius: 6px; text-decoration: none; font-weight: 750; cursor: pointer; transition: transform .2s, box-shadow .2s, background .2s; }
    .button:hover { transform: translateY(-2px); box-shadow: 0 8px 18px rgba(23,94,232,.18); }
    .button-primary { color: white; background: var(--blue); }
    .button-outline { color: var(--ink); border-color: #b9c9db; background: rgba(255,255,255,.78); }
    .hero-points { display: flex; flex-wrap: wrap; gap: 10px 22px; margin-top: 28px; color: #43566d; font-size: 14px; }
    .hero-points span::before { content: "✓"; color: var(--green); font-weight: 900; margin-right: 7px; }
    .signal-strip { background: white; border-bottom: 1px solid var(--line); }
    .signals { display: grid; grid-template-columns: repeat(4, 1fr); }
    .signal { padding: 21px 18px; border-right: 1px solid var(--line); }
    .signal:last-child { border-right: 0; }
    .signal strong { display: block; font-size: 20px; }
    .signal span { color: var(--muted); font-size: 13px; }
    main { overflow: hidden; }
    .section { padding: 68px 0; }
    .section-white { background: white; }
    .section-heading { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 28px; }
    .section-heading h2 { margin: 0; font-size: 30px; line-height: 1.25; }
    .section-heading p { max-width: 610px; margin: 8px 0 0; color: var(--muted); }
    .section-kicker { color: var(--blue); font-size: 12px; font-weight: 800; text-transform: uppercase; }
    .intro-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 38px; align-items: start; }
    .intro-copy p { margin: 0 0 14px; color: #445468; }
    .capability-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px 18px; margin: 22px 0 0; padding: 0; list-style: none; }
    .capability-list li { padding: 11px 0; border-bottom: 1px solid var(--line); font-weight: 650; }
    .capability-list li::before { content: "＋"; color: var(--cyan); margin-right: 8px; }
    .intro-aside { padding: 23px; border-left: 4px solid var(--coral); background: #fff4ef; }
    .intro-aside strong { display: block; margin-bottom: 8px; font-size: 17px; }
    .intro-aside p { margin: 0; color: #596777; }
    .service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
    .service-item { min-height: 156px; padding: 20px; border: 1px solid var(--line); border-radius: 6px; background: white; transition: transform .2s, box-shadow .2s, border-color .2s; }
    .service-item:hover { transform: translateY(-4px); border-color: #a9c4ed; box-shadow: var(--shadow); }
    .service-item h3 { margin: 0 0 8px; font-size: 17px; }
    .service-item p { margin: 0; color: var(--muted); font-size: 14px; }
    .service-label { display: inline-block; margin-bottom: 10px; color: var(--blue); font-size: 11px; font-weight: 800; }
    .workflow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; counter-reset: steps; }
    .step { position: relative; padding: 10px 22px 10px 0; }
    .step:not(:last-child)::after { content: ""; position: absolute; top: 29px; left: 47px; right: 12px; height: 1px; background: #bfd0e3; }
    .step-number { position: relative; z-index: 1; display: grid; width: 42px; height: 42px; place-items: center; border: 1px solid #a9c4ed; border-radius: 50%; background: white; color: var(--blue); font-weight: 800; }
    .step h3 { margin: 14px 0 5px; font-size: 16px; }
    .step p { margin: 0; color: var(--muted); font-size: 14px; }
    .solution-band { color: white; background: #1b2a3d; }
    .solution-band .section-heading p { color: #c8d4e0; }
    .solution-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: #435368; border: 1px solid #435368; }
    .solution-cell { padding: 21px; background: #1b2a3d; }
    .solution-cell h3 { margin: 0 0 7px; color: #93ddeb; font-size: 16px; }
    .solution-cell p { margin: 0; color: #d7e0e9; font-size: 14px; }
    .media-grid { display: grid; grid-template-columns: 1.3fr .7fr; gap: 16px; align-items: start; }
    .media-stack { display: grid; gap: 16px; }
    .media-frame { overflow: hidden; border: 1px solid var(--line); background: #edf2f7; }
    .media-frame img { display: block; width: 100%; height: auto; }
    .media-caption { padding: 12px 14px; background: white; color: #46576b; font-size: 14px; }
    .review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
    .review { padding: 19px; border-top: 3px solid var(--cyan); background: white; }
    .review p { margin: 0 0 14px; color: #405166; font-size: 14px; }
    .review strong { display: block; font-size: 14px; }
    .review span { color: var(--muted); font-size: 12px; }
    .score-layout { display: grid; grid-template-columns: .75fr 1.25fr; gap: 30px; align-items: start; }
    .score-panel { padding: 26px; background: #eaf3ff; border: 1px solid #c8d9f0; }
    .score-panel strong { display: block; color: var(--blue); font-size: 56px; line-height: 1.1; }
    .stars { color: #d5791b; font-size: 22px; letter-spacing: 0; }
    .score-panel p { margin: 8px 0 0; color: #4b5b70; }
    .table-wrap { overflow-x: auto; border: 1px solid var(--line); background: white; }
    table { width: 100%; border-collapse: collapse; text-align: left; }
    th, td { padding: 13px 15px; border-bottom: 1px solid var(--line); vertical-align: top; }
    th { background: #eef3f8; font-size: 13px; }
    td { color: #405166; font-size: 14px; }
    tr:last-child td { border-bottom: 0; }
    .good { color: var(--green); font-weight: 750; }
    .model-line { padding: 19px 0; border-top: 1px solid var(--line); color: #43546a; }
    .model-line strong { color: var(--ink); }
    .model-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 13px; }
    .model-tags span { padding: 5px 9px; border: 1px solid #d7e1ec; background: white; color: #42546a; 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; font-weight: 700; list-style: none; }
    summary::-webkit-details-marker { display: none; }
    summary::after { content: "+"; position: absolute; right: 3px; top: 13px; color: var(--blue); font-size: 22px; }
    details[open] summary::after { content: "−"; }
    details p { max-width: 850px; margin: 0 36px 17px 0; color: var(--muted); }
    .article-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
    .article-link { display: block; padding: 15px; border: 1px solid var(--line); background: white; text-decoration: none; font-weight: 700; font-size: 14px; transition: border-color .2s, color .2s; }
    .article-link:hover { border-color: var(--blue); color: var(--blue); }
    .contact-grid { display: grid; grid-template-columns: .75fr 1.25fr; gap: 38px; align-items: start; }
    .contact-info p { margin: 8px 0; color: #4c5c70; }
    .contact-info a { color: var(--blue); text-decoration-thickness: 1px; text-underline-offset: 3px; }
    .qr-frame { width: 150px; margin-top: 16px; border: 1px solid var(--line); background: white; padding: 7px; }
    .qr-frame img { display: block; width: 100%; }
    .contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
    .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%; min-height: 44px; padding: 10px 11px; border: 1px solid #cbd6e2; border-radius: 4px; background: white; color: var(--ink); }
    .field textarea { min-height: 118px; resize: vertical; }
    .form-note { grid-column: 1 / -1; margin: 0; color: var(--muted); font-size: 12px; }
    .footer { padding: 27px 0; border-top: 1px solid var(--line); background: #edf2f7; color: #344357; }
    .footer-top { display: flex; justify-content: space-between; align-items: center; gap: 18px; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 8px 17px; }
    .footer a { color: #31588d; font-size: 13px; text-decoration: none; }
    .copyright { margin: 12px 0 0; color: #566477; font-size: 12px; }
    .floating { position: fixed; right: 18px; bottom: 18px; z-index: 15; display: grid; gap: 8px; }
    .floating a { display: grid; min-width: 48px; min-height: 46px; place-items: center; padding: 7px 10px; border: 1px solid #cfdae6; border-radius: 6px; background: white; color: var(--ink); box-shadow: var(--shadow); text-decoration: none; font-size: 12px; font-weight: 750; }
    .floating a:hover { color: var(--blue); border-color: #9ab9e8; }
    .reveal { opacity: 0; transform: translateY(14px); transition: opacity .55s ease, transform .55s ease; }
    .reveal.is-visible { opacity: 1; transform: none; }
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
      .reveal { opacity: 1; transform: none; }
    }
    @media (max-width: 920px) {
      .menu-toggle { display: inline-grid; place-items: center; }
      .nav-links { display: none; position: absolute; top: 72px; left: 0; right: 0; align-items: stretch; padding: 10px 20px 16px; border-bottom: 1px solid var(--line); background: white; }
      .nav-links.is-open { display: grid; grid-template-columns: repeat(2, 1fr); }
      .nav-links a { padding: 10px; }
      .nav-links .nav-cta { margin: 0; text-align: center; }
      .intro-grid, .score-layout, .contact-grid { grid-template-columns: 1fr; }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .article-grid { grid-template-columns: repeat(3, 1fr); }
    }
    @media (max-width: 620px) {
      .container { width: min(var(--container), calc(100% - 30px)); }
      .hero { padding: 56px 0 38px; }
      h1 { font-size: 40px; }
      .hero p { font-size: 16px; }
      .signals { grid-template-columns: repeat(2, 1fr); }
      .signal:nth-child(2) { border-right: 0; }
      .signal:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
      .section { padding: 48px 0; }
      .section-heading { display: block; }
      .section-heading h2 { font-size: 26px; }
      .service-grid, .solution-grid, .review-grid { grid-template-columns: 1fr; }
      .workflow { grid-template-columns: repeat(2, 1fr); gap: 18px 10px; }
      .step:not(:last-child)::after { display: none; }
      .media-grid { grid-template-columns: 1fr; }
      .article-grid { grid-template-columns: repeat(2, 1fr); }
      .contact-form { grid-template-columns: 1fr; }
      .field-full, .form-note { grid-column: auto; }
      .footer-top { align-items: flex-start; flex-direction: column; }
      .floating { right: 10px; bottom: 10px; }
      .floating a { min-width: 42px; min-height: 42px; }
    }