:root {
      color-scheme: light;
      --ink: #17222c;
      --muted: #5b6873;
      --paper: #f5f7fa;
      --white: #fff;
      --line: #dce3e8;
      --teal: #087f78;
      --teal-dark: #075e5a;
      --coral: #ec654b;
      --yellow: #ffd24a;
      --blue: #254e70;
      --container: 1160px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; scroll-padding-top: 86px; }
    body {
      margin: 0;
      background: var(--paper);
      color: var(--ink);
      font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
      line-height: 1.65;
    }
    a { color: inherit; text-decoration: none; }
    button, input, select, textarea { font: inherit; }
    button, a { -webkit-tap-highlight-color: transparent; }
    .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); }
    .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; flex: 0 0 auto; font-weight: 800; font-size: 18px; }
    .ai-page-logo { display: block; width: 38px; max-width: 100%; height: auto; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; gap: 0; flex-wrap: wrap; color: #33424d; font-size: 13px; }
    .nav-links a { padding: 9px 10px; border-radius: 5px; transition: background .2s, color .2s; }
    .nav-links a:hover { background: #eaf4f2; color: var(--teal-dark); }
    .nav-actions { display: flex; gap: 8px; align-items: center; flex: 0 0 auto; }
    .menu-toggle { display: none; }
    .button { display: inline-flex; justify-content: center; align-items: center; gap: 8px; min-height: 44px; padding: 10px 17px; border: 1px solid transparent; border-radius: 5px; font-weight: 700; transition: transform .2s, box-shadow .2s, background .2s; cursor: pointer; }
    .button:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(23,34,44,.13); }
    .button-primary { background: var(--coral); color: #fff; }
    .button-primary:hover { background: #d95139; }
    .button-dark { background: var(--ink); color: #fff; }
    .button-outline { border-color: #aab8c0; color: var(--ink); background: transparent; }
    .hero { position: relative; overflow: hidden; padding: 72px 0 56px; background: #dff2ef; border-bottom: 1px solid #c5dfdc; }
    .hero::before { content: ""; position: absolute; right: max(0px, calc((100vw - var(--container))/2)); top: 38px; width: 225px; aspect-ratio: 1; border: 1px solid rgba(8,127,120,.23); transform: rotate(25deg); border-radius: 26px; }
    .hero::after { content: ""; position: absolute; right: max(66px, calc((100vw - var(--container))/2 + 60px)); top: 100px; width: 118px; aspect-ratio: 1; background: var(--yellow); border-radius: 50%; opacity: .75; }
    .hero-inner { position: relative; z-index: 1; max-width: 760px; }
    .eyebrow { margin: 0 0 14px; color: var(--teal-dark); font-size: 13px; font-weight: 800; letter-spacing: 0; text-transform: uppercase; }
    h1 { max-width: 740px; margin: 0; font-size: clamp(38px, 6vw, 66px); line-height: 1.12; letter-spacing: 0; }
    .hero-copy { max-width: 660px; margin: 21px 0 26px; color: #3e535d; font-size: 17px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 11px; }
    .hero-proof { display: flex; flex-wrap: wrap; gap: 10px 24px; margin-top: 26px; color: #37504e; font-size: 13px; }
    .hero-proof span::before { content: "✓"; color: var(--teal); font-weight: 900; margin-right: 7px; }
    .metrics { display: grid; grid-template-columns: repeat(4,1fr); margin-top: 34px; gap: 1px; background: #c7d8d8; border: 1px solid #c7d8d8; }
    .metric { padding: 19px 20px; background: rgba(255,255,255,.86); }
    .metric strong { display: block; font-size: 22px; line-height: 1.2; }
    .metric span { color: var(--muted); font-size: 12px; }
    main { overflow: hidden; }
    .section { padding: 68px 0; }
    .section-band { background: #edf2f4; border-block: 1px solid #e0e7eb; }
    .section-head { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 27px; }
    .section-head h2 { margin: 0; font-size: 30px; line-height: 1.25; letter-spacing: 0; }
    .section-head p { max-width: 560px; margin: 7px 0 0; color: var(--muted); }
    .kicker { color: var(--coral); font-size: 12px; font-weight: 800; margin: 0 0 7px; }
    .intro-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 38px; align-items: start; }
    .intro-grid h2 { max-width: 540px; margin: 0 0 14px; font-size: 32px; line-height: 1.25; }
    .intro-grid p { color: var(--muted); margin: 0 0 13px; }
    .intro-points { border-left: 3px solid var(--yellow); padding: 2px 0 2px 22px; display: grid; gap: 15px; }
    .intro-points strong { display: block; font-size: 16px; }
    .intro-points span { color: var(--muted); font-size: 14px; }
    .service-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; }
    .service { min-width: 0; padding: 21px; background: var(--white); border: 1px solid var(--line); border-top: 3px solid var(--teal); transition: transform .22s, box-shadow .22s; }
    .service:hover, .review:hover, .case:hover { transform: translateY(-4px); box-shadow: 0 12px 26px rgba(23,34,44,.09); }
    .service:nth-child(3n+2) { border-top-color: var(--coral); }
    .service:nth-child(3n) { border-top-color: var(--yellow); }
    .service h3 { margin: 0 0 8px; font-size: 18px; }
    .service p { margin: 0; color: var(--muted); font-size: 14px; }
    .service .tagline { display: inline-block; margin-top: 14px; color: var(--teal-dark); font-size: 12px; font-weight: 700; }
    .workflow { display: grid; grid-template-columns: repeat(4,1fr); gap: 0; counter-reset: steps; }
    .step { position: relative; padding: 18px 20px 10px 0; border-top: 2px solid #bdcfce; counter-increment: steps; }
    .step::before { content: "0" counter(steps); display: block; margin-bottom: 14px; color: var(--coral); font-size: 24px; font-weight: 800; }
    .step h3 { margin: 0 0 6px; font-size: 17px; }
    .step p { margin: 0; color: var(--muted); font-size: 14px; }
    .solution-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: start; }
    .solution-copy { padding-right: 12px; }
    .solution-copy h2 { margin: 0 0 12px; font-size: 30px; }
    .solution-copy p { color: var(--muted); }
    .solution-list { display: grid; grid-template-columns: 1fr 1fr; gap: 0 18px; padding: 0; margin: 20px 0 0; list-style: none; }
    .solution-list li { padding: 10px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
    .solution-list li::before { content: "↗"; color: var(--teal); font-weight: 800; margin-right: 8px; }
    .promo-images { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
    .image-frame { margin: 0; overflow: hidden; background: #e4e9ec; border: 1px solid var(--line); }
    .image-frame img { display: block; width: 100%; height: auto; object-fit: contain; }
    .image-frame.wide:first-child { grid-column: 1 / -1; }
    .image-frame.square img { aspect-ratio: 1; object-fit: cover; }
    .image-caption { padding: 10px 12px; color: var(--muted); background: #fff; font-size: 12px; }
    .comparison { overflow-x: auto; border: 1px solid var(--line); background: #fff; }
    table { width: 100%; border-collapse: collapse; min-width: 720px; }
    th, td { padding: 14px 16px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
    thead th { background: #17222c; color: #fff; font-size: 14px; }
    tbody th { width: 20%; color: #263944; background: #f1f5f5; font-size: 14px; }
    td { color: #4c5b64; font-size: 14px; }
    .rating { display: flex; flex-wrap: wrap; align-items: center; gap: 7px 15px; margin: 0 0 20px; padding: 17px 20px; background: #fff0c2; border-left: 4px solid #e2a900; }
    .rating strong { font-size: 23px; }
    .stars { color: #a66c00; letter-spacing: 0; }
    .cases-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; }
    .case { background: #fff; border: 1px solid var(--line); transition: transform .22s, box-shadow .22s; }
    .case img { display: block; width: 100%; height: auto; aspect-ratio: 4 / 3; object-fit: cover; }
    .case-body { padding: 17px; }
    .case h3 { margin: 0 0 6px; font-size: 17px; }
    .case p { margin: 0; color: var(--muted); font-size: 14px; }
    .reviews-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 13px; }
    .review { padding: 19px; background: #fff; border: 1px solid var(--line); border-radius: 4px; transition: transform .2s, box-shadow .2s; }
    .review blockquote { margin: 0 0 16px; color: #35444d; font-size: 14px; }
    .review footer { display: flex; justify-content: space-between; gap: 10px; color: var(--muted); font-size: 12px; }
    .faq-list { border-top: 1px solid var(--line); }
    details { border-bottom: 1px solid var(--line); }
    summary { position: relative; padding: 17px 34px 17px 0; cursor: pointer; list-style: none; font-weight: 700; }
    summary::-webkit-details-marker { display: none; }
    summary::after { content: "+"; position: absolute; right: 4px; top: 14px; color: var(--teal); font-size: 22px; font-weight: 400; }
    details[open] summary::after { content: "−"; }
    details p { max-width: 850px; margin: 0; padding: 0 34px 17px 0; color: var(--muted); font-size: 14px; }
    .model-strip { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
    .model-strip span { padding: 6px 10px; border: 1px solid #cbd8db; color: #31434d; background: #fff; font-size: 12px; }
    .article-wrap { padding: 20px; border: 1px solid var(--line); background: #fff; }
    .article-wrap p { margin: 0; color: var(--muted); }
    .contact-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 38px; align-items: start; }
    .contact-copy h2 { margin: 0 0 12px; font-size: 30px; }
    .contact-copy p { color: var(--muted); }
    .contact-list { display: grid; gap: 9px; margin-top: 20px; color: #33434c; font-size: 14px; }
    .contact-list a { color: var(--teal-dark); text-decoration: underline; text-underline-offset: 3px; }
    .contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 13px; padding: 22px; background: #fff; border: 1px solid var(--line); }
    .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-width: 0; padding: 11px 12px; color: var(--ink); border: 1px solid #bac7ce; border-radius: 3px; background: #fff; }
    .field textarea { min-height: 112px; resize: vertical; }
    .contact-form button { justify-self: start; }
    .join-band { padding: 28px; color: #fff; background: var(--blue); display: flex; align-items: center; justify-content: space-between; gap: 20px; }
    .join-band h2 { margin: 0 0 5px; font-size: 24px; }
    .join-band p { margin: 0; color: #dbe7ec; font-size: 14px; }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 24px; }
    .tag-cloud a { padding: 8px 11px; color: #24434a; background: #e3efed; border-bottom: 2px solid #8dbbb5; font-size: 13px; }
    .site-footer { padding: 28px 0 22px; color: #23313a; background: #e6ecef; border-top: 1px solid #d1dade; }
    .footer-row { display: flex; justify-content: space-between; align-items: start; gap: 24px; }
    .footer-brand { font-weight: 800; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 8px 16px; font-size: 13px; }
    .footer-links a { color: #31525a; text-decoration: underline; text-underline-offset: 3px; }
    .copyright { margin: 18px 0 0; padding-top: 14px; border-top: 1px solid #cbd5da; color: #52616a; font-size: 12px; }
    .floating { position: fixed; right: 18px; bottom: 18px; z-index: 15; display: grid; gap: 8px; }
    .float-link { display: grid; place-items: center; width: 48px; height: 48px; border-radius: 50%; color: #fff; background: var(--teal); box-shadow: 0 5px 16px rgba(20,50,50,.24); font-size: 13px; font-weight: 700; }
    .float-link.top { color: var(--ink); background: var(--yellow); }
    .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: 960px) {
      .nav-row { flex-wrap: wrap; padding: 12px 0; }
      .nav-links { order: 3; width: 100%; justify-content: flex-start; }
      .nav-actions { margin-left: auto; }
      .service-grid { grid-template-columns: repeat(2,1fr); }
      .hero::before { right: 7%; }
      .hero::after { right: 13%; }
    }
    @media (max-width: 680px) {
      .container { width: min(var(--container), calc(100% - 32px)); }
      .nav-row { min-height: 64px; }
      .brand { font-size: 16px; }
      .ai-page-logo { width: 32px; }
      .menu-toggle { display: inline-flex; width: 42px; height: 42px; justify-content: center; align-items: center; border: 1px solid var(--line); border-radius: 4px; color: var(--ink); background: #fff; font-size: 20px; }
      .nav-actions .button { display: none; }
      .nav-links { display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 4px 0 8px; }
      .nav-links.is-open { display: flex; }
      .nav-links a { padding: 10px 8px; border-bottom: 1px solid #edf0f2; }
      .hero { padding: 52px 0 34px; }
      .hero::before { top: 26px; right: -62px; width: 160px; opacity: .65; }
      .hero::after { top: 71px; right: 18px; width: 64px; }
      .hero-inner { max-width: 100%; }
      .hero-copy { font-size: 15px; }
      .metrics { grid-template-columns: repeat(2,1fr); margin-top: 26px; }
      .metric { padding: 14px; }
      .metric strong { font-size: 19px; }
      .section { padding: 48px 0; }
      .section-head { display: block; margin-bottom: 21px; }
      .section-head h2, .intro-grid h2, .solution-copy h2, .contact-copy h2 { font-size: 26px; }
      .intro-grid, .solution-grid, .contact-grid { grid-template-columns: 1fr; gap: 25px; }
      .service-grid, .cases-grid, .reviews-grid { grid-template-columns: 1fr; }
      .service { padding: 18px; }
      .workflow { grid-template-columns: 1fr 1fr; gap: 16px; }
      .step { padding-right: 10px; }
      .solution-list { grid-template-columns: 1fr; }
      .promo-images { gap: 8px; }
      .join-band { align-items: flex-start; flex-direction: column; padding: 22px; }
      .contact-form { grid-template-columns: 1fr; padding: 17px; }
      .field.full { grid-column: auto; }
      .footer-row { flex-direction: column; }
      .floating { right: 11px; bottom: 12px; }
      .float-link { width: 44px; height: 44px; }
    }