:root {
      color-scheme: light;
      --ink: #172334;
      --muted: #586779;
      --line: #dce4ed;
      --paper: #f8fafc;
      --white: #fff;
      --blue: #1768e5;
      --cyan: #16a6b6;
      --coral: #f06b53;
      --green: #18866d;
      --max: 1160px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      line-height: 1.65;
    }
    a { color: inherit; text-decoration: none; }
    button, input, select, textarea { font: inherit; }
    button, a, summary { -webkit-tap-highlight-color: transparent; }
    .container { width: min(var(--max), 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); }
    .nav-row { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 22px; }
    .brand { display: inline-flex; align-items: center; flex: 0 0 auto; gap: 10px; font-weight: 800; font-size: 19px; }
    .ai-page-logo { display: block; width: 38px; max-width: 100%; height: auto; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; flex-wrap: wrap; gap: 0; color: #455468; font-size: 13px; }
    .nav-links a { padding: 8px 9px; border-radius: 5px; }
    .nav-links a:hover, .nav-links a:focus-visible { color: var(--blue); background: #edf4ff; }
    .nav-cta, .button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; border: 0; border-radius: 5px; padding: 11px 17px; background: var(--blue); color: #fff; font-weight: 700; cursor: pointer; transition: transform .2s ease, background .2s ease, box-shadow .2s ease; }
    .nav-cta:hover, .button:hover { transform: translateY(-2px); background: #0d56c4; box-shadow: 0 8px 20px rgba(23,104,229,.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: 76px 0 58px; background: linear-gradient(120deg, #f1f7ff 0%, #f8fbff 48%, #edfbf8 100%); border-bottom: 1px solid #dceaf0; }
    .hero::after { content: ""; position: absolute; right: max(2%, calc((100vw - var(--max))/2)); top: 52px; width: 290px; aspect-ratio: 1; border: 1px solid rgba(22,166,182,.2); border-radius: 50%; box-shadow: 0 0 0 34px rgba(22,166,182,.035), 0 0 0 70px rgba(23,104,229,.025); pointer-events: none; }
    .hero-inner { position: relative; z-index: 1; max-width: 760px; }
    .eyebrow { display: inline-flex; align-items: center; gap: 9px; color: #087d87; font-size: 13px; font-weight: 750; }
    .eyebrow::before { content: ""; width: 24px; height: 2px; background: var(--coral); }
    h1 { max-width: 720px; margin: 17px 0 14px; font-size: clamp(38px, 6vw, 66px); line-height: 1.1; letter-spacing: 0; }
    .hero p { max-width: 680px; margin: 0; color: #46566b; font-size: 18px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 27px; }
    .button-secondary { border: 1px solid #bacadd; background: #fff; color: var(--ink); }
    .button-secondary:hover { background: #f1f6fd; box-shadow: none; }
    .hero-note { margin-top: 20px !important; font-size: 13px !important; color: #657589 !important; }
    .signal-row { display: grid; grid-template-columns: repeat(4,1fr); gap: 0; margin-top: 43px; border-top: 1px solid #d5e0e9; }
    .signal { padding: 18px 18px 0 0; }
    .signal strong { display: block; font-size: 18px; }
    .signal span { color: var(--muted); font-size: 13px; }
    .section { padding: 66px 0; }
    .section-white { background: #fff; border-block: 1px solid #e4eaf0; }
    .section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 27px; }
    .section-head > div { max-width: 760px; }
    .kicker { margin: 0 0 6px; color: #07818b; font-size: 12px; font-weight: 800; text-transform: uppercase; }
    h2 { margin: 0; font-size: clamp(26px, 3.4vw, 38px); line-height: 1.2; letter-spacing: 0; }
    .section-intro { max-width: 680px; margin: 10px 0 0; color: var(--muted); }
    h3 { margin: 0 0 8px; font-size: 18px; line-height: 1.35; }
    .copy { color: var(--muted); }
    .intro-layout { display: grid; grid-template-columns: 1.15fr .85fr; gap: 38px; align-items: start; }
    .intro-copy p { margin: 0 0 14px; color: var(--muted); }
    .feature-list { display: grid; grid-template-columns: repeat(2,1fr); gap: 0 18px; margin: 20px 0 0; padding: 0; list-style: none; }
    .feature-list li { padding: 12px 0; border-top: 1px solid var(--line); font-weight: 700; }
    .feature-list li span { display: block; margin-top: 3px; color: var(--muted); font-size: 13px; font-weight: 400; }
    .model-panel { padding: 23px; background: #eaf6f4; border-left: 4px solid var(--cyan); }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
    .tag-cloud span { padding: 5px 9px; background: #fff; border: 1px solid #d5e7e4; border-radius: 4px; color: #31495a; font-size: 12px; }
    .grid-3 { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 16px; }
    .service { padding: 20px; background: #fff; border: 1px solid var(--line); border-top: 3px solid var(--cyan); transition: transform .2s ease, box-shadow .2s ease; }
    .service:nth-child(3n+2) { border-top-color: var(--coral); }
    .service:nth-child(3n) { border-top-color: var(--blue); }
    .service:hover { transform: translateY(-3px); box-shadow: 0 12px 28px rgba(29,53,79,.08); }
    .service p { margin: 0; color: var(--muted); font-size: 14px; }
    .service .service-type { display: block; margin-bottom: 7px; color: #66788a; font-size: 11px; font-weight: 750; }
    .band { background: #eef5fb; border-block: 1px solid #dae5ef; }
    .workflow { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 0; counter-reset: flow; }
    .workflow article { position: relative; padding: 18px 22px 12px 0; border-top: 2px solid #b7c9d9; counter-increment: flow; }
    .workflow article::before { content: "0" counter(flow); display: block; margin-bottom: 12px; color: var(--blue); font-size: 13px; font-weight: 800; }
    .workflow p { margin: 0; color: var(--muted); font-size: 14px; }
    .scenario-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px 38px; }
    .scenario { padding: 17px 0; border-bottom: 1px solid var(--line); }
    .scenario h3 { display: flex; align-items: center; gap: 10px; }
    .scenario h3::before { content: ""; width: 8px; height: 8px; background: var(--coral); border-radius: 50%; flex: 0 0 auto; }
    .scenario p { margin: 0; color: var(--muted); font-size: 14px; }
    .table-wrap { overflow-x: auto; border: 1px solid var(--line); background: #fff; }
    table { width: 100%; border-collapse: collapse; min-width: 680px; }
    th, td { padding: 14px 16px; text-align: left; border-bottom: 1px solid #e5eaf0; }
    th { color: #25364a; background: #edf4fa; font-size: 13px; }
    td { color: #4e5d6c; font-size: 14px; }
    tr:last-child td { border-bottom: 0; }
    .rating { display: flex; align-items: center; gap: 14px; margin-bottom: 19px; }
    .rating-score { color: var(--blue); font-size: 38px; font-weight: 850; line-height: 1; }
    .rating-stars { color: #e59325; font-size: 20px; letter-spacing: 0; }
    .rating small { display: block; color: var(--muted); font-size: 12px; }
    .cases { display: grid; grid-template-columns: 1.2fr .8fr; gap: 20px; }
    .case-feature { padding: 26px; color: #fff; background: #173f59; }
    .case-feature h3 { font-size: 22px; }
    .case-feature p { max-width: 590px; margin: 0; color: #e2edf4; }
    .case-side { display: grid; gap: 12px; }
    .case-line { padding: 17px 18px; background: #fff; border: 1px solid var(--line); }
    .case-line p { margin: 4px 0 0; color: var(--muted); font-size: 13px; }
    .reviews { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 14px; }
    .review { padding: 19px; background: #fff; border: 1px solid var(--line); }
    .review blockquote { margin: 0 0 15px; color: #3c4d5f; font-size: 14px; }
    .review cite { color: #627387; font-size: 12px; font-style: normal; font-weight: 700; }
    .article-list { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 0 30px; }
    .article-list a { display: flex; justify-content: space-between; gap: 12px; padding: 15px 0; border-bottom: 1px solid var(--line); font-weight: 650; }
    .article-list a::after { content: "↗"; color: var(--blue); }
    .article-list a:hover { color: var(--blue); }
    .faq-list { border-top: 1px solid var(--line); }
    details { border-bottom: 1px solid var(--line); }
    summary { position: relative; padding: 16px 34px 16px 0; cursor: pointer; font-weight: 700; list-style: none; }
    summary::-webkit-details-marker { display: none; }
    summary::after { content: "+"; position: absolute; right: 4px; top: 12px; color: var(--blue); font-size: 22px; font-weight: 400; }
    details[open] summary::after { content: "−"; }
    details p { max-width: 850px; margin: 0 0 17px; color: var(--muted); }
    .contact-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 38px; align-items: start; }
    .contact-details { display: grid; gap: 13px; margin-top: 18px; }
    .contact-details p { margin: 0; color: var(--muted); }
    .contact-details strong { color: var(--ink); }
    .contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; padding: 22px; background: #fff; border: 1px solid var(--line); }
    .field { display: grid; gap: 6px; }
    .field-full { grid-column: 1 / -1; }
    label { color: #3b4b5b; font-size: 13px; font-weight: 700; }
    input, select, textarea { width: 100%; min-width: 0; padding: 11px 12px; color: var(--ink); background: #fff; border: 1px solid #cbd6e1; border-radius: 4px; }
    input:focus, select:focus, textarea:focus { outline: 2px solid rgba(23,104,229,.2); border-color: var(--blue); }
    textarea { min-height: 112px; resize: vertical; }
    .form-note { grid-column: 1 / -1; margin: -4px 0 0; color: var(--muted); font-size: 12px; }
    .footer { padding: 27px 0; color: #334458; background: #eaf0f5; border-top: 1px solid #d8e1e9; }
    .footer-top { display: flex; align-items: start; justify-content: space-between; gap: 28px; }
    .footer p { margin: 5px 0; color: #536477; font-size: 13px; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 8px 16px; max-width: 590px; font-size: 13px; }
    .footer-links a { color: #334e68; text-decoration: underline; text-decoration-color: #b0bfcd; text-underline-offset: 3px; }
    .footer-bottom { margin-top: 18px; padding-top: 12px; border-top: 1px solid #d4dee7; color: #5b6c7c; font-size: 12px; }
    .float-contact { position: fixed; right: 18px; bottom: 20px; z-index: 18; display: inline-flex; align-items: center; gap: 8px; padding: 11px 15px; border: 0; border-radius: 5px; color: #fff; background: #14886c; box-shadow: 0 5px 18px rgba(20,136,108,.25); font-weight: 750; }
    .float-contact:hover { background: #0e7058; }
    .top-link { position: fixed; right: 22px; bottom: 78px; z-index: 18; width: 40px; height: 40px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 4px; color: var(--ink); background: #fff; opacity: 0; pointer-events: none; transition: opacity .2s ease; }
    .top-link.visible { opacity: 1; pointer-events: auto; }
    .reveal { opacity: 0; transform: translateY(12px); transition: opacity .45s ease, transform .45s ease; }
    .reveal.is-visible { opacity: 1; transform: none; }
    .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
    @media (max-width: 980px) {
      .nav-row { gap: 12px; }
      .nav-links { display: none; position: absolute; top: 72px; left: 0; right: 0; padding: 12px 20px 17px; justify-content: flex-start; background: #fff; border-bottom: 1px solid var(--line); box-shadow: 0 12px 20px rgba(25,45,65,.08); }
      .nav-links.open { display: flex; }
      .nav-links a { padding: 9px 11px; }
      .menu-toggle { display: inline-grid; place-items: center; }
      .nav-cta { margin-left: auto; }
      .hero::after { right: -110px; }
    }
    @media (max-width: 700px) {
      .container { width: min(var(--max), calc(100% - 32px)); }
      .nav-row { min-height: 64px; }
      .brand { font-size: 17px; }
      .ai-page-logo { width: 32px; }
      .nav-cta { padding: 9px 11px; font-size: 13px; }
      .nav-links { top: 64px; }
      .hero { padding: 56px 0 38px; }
      .hero::after { top: 24px; right: -205px; width: 260px; }
      .hero p { font-size: 16px; }
      .signal-row { grid-template-columns: repeat(2,1fr); margin-top: 30px; }
      .signal { padding: 13px 10px 0 0; }
      .section { padding: 48px 0; }
      .section-head { display: block; }
      .grid-3, .reviews { grid-template-columns: repeat(2,minmax(0,1fr)); }
      .intro-layout, .scenario-grid, .cases, .contact-layout { grid-template-columns: 1fr; }
      .workflow { grid-template-columns: repeat(2,minmax(0,1fr)); gap: 8px 20px; }
      .case-feature { padding: 21px; }
      .footer-top { flex-direction: column; }
    }
    @media (max-width: 460px) {
      .container { width: calc(100% - 28px); }
      .brand { gap: 7px; font-size: 15px; }
      .nav-cta { padding: 8px 9px; font-size: 12px; }
      .menu-toggle { width: 38px; height: 38px; }
      .hero-actions .button { flex: 1 1 100%; }
      .grid-3, .reviews, .article-list, .feature-list { grid-template-columns: 1fr; }
      .workflow { grid-template-columns: 1fr 1fr; }
      .contact-form { grid-template-columns: 1fr; padding: 16px; }
      .field-full, .form-note { grid-column: auto; }
      .float-contact { right: 12px; bottom: 14px; padding: 10px 12px; }
      .top-link { right: 15px; bottom: 67px; }
    }
    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
      .reveal { opacity: 1; transform: none; }
    }