:root {
      color-scheme: light;
      --ink: #173c3a;
      --body: #425c5a;
      --muted: #718783;
      --teal: #087f78;
      --teal-dark: #07645f;
      --mint: #dff5ef;
      --lime: #d8ed85;
      --paper: #f7fbf8;
      --line: #dcebe5;
      --white: #fff;
      --coral: #d56f50;
      --container: 1160px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; scroll-padding-top: 88px; }
    body {
      margin: 0;
      background: var(--paper);
      color: var(--body);
      font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans SC", "Microsoft YaHei", sans-serif;
      font-size: 15px;
      line-height: 1.7;
    }
    a { color: inherit; text-decoration: none; }
    button, input, select, textarea { font: inherit; }
    img { display: block; 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(247,251,248,.96); border-bottom: 1px solid var(--line); backdrop-filter: blur(12px); }
    .header-row { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
    .brand { display: inline-flex; align-items: center; gap: 11px; flex: 0 0 auto; color: var(--ink); font-weight: 760; }
    .ai-page-logo { width: 38px; max-width: 100%; height: auto; }
    .brand-name { font-size: 17px; }
    .header-actions { display: flex; align-items: center; justify-content: flex-end; gap: 14px; min-width: 0; }
    .desktop-home { color: var(--body); font-size: 13px; }
    .nav-toggle { display: none; border: 1px solid var(--line); background: white; color: var(--ink); border-radius: 5px; min-width: 42px; min-height: 40px; cursor: pointer; }
    .nav-links { display: flex; flex-wrap: wrap; justify-content: flex-end; align-items: center; gap: 0; max-width: 850px; }
    .nav-links a { padding: 7px 8px; color: var(--body); font-size: 12px; white-space: nowrap; border-radius: 3px; }
    .nav-links a:hover, .nav-links a:focus-visible { background: var(--mint); color: var(--teal-dark); }
    .button { min-height: 46px; display: inline-flex; align-items: center; justify-content: center; gap: 9px; padding: 0 19px; border: 1px solid transparent; border-radius: 4px; background: var(--teal); color: white; font-weight: 700; cursor: pointer; transition: transform .2s, background .2s, box-shadow .2s; }
    .button:hover { transform: translateY(-2px); background: var(--teal-dark); box-shadow: 0 7px 18px rgba(8,127,120,.18); }
    .button-light { color: var(--teal-dark); background: white; border-color: var(--line); }
    .button-light:hover { color: white; background: var(--teal); }
    .hero { position: relative; overflow: hidden; padding: 74px 0 52px; background: linear-gradient(115deg, #e5f7f0 0%, #f3faf5 57%, #d8f1ec 100%); border-bottom: 1px solid #d4eae2; }
    .hero:after { position: absolute; right: max(3%, calc((100vw - var(--container))/2)); top: 40px; width: 210px; height: 210px; border: 1px solid rgba(8,127,120,.16); border-radius: 50%; content: ""; box-shadow: 0 0 0 28px rgba(8,127,120,.035), 0 0 0 58px rgba(8,127,120,.025); pointer-events: none; }
    .hero-inner { position: relative; z-index: 1; max-width: 760px; }
    .eyebrow { display: inline-flex; align-items: center; gap: 9px; color: var(--teal-dark); font-size: 12px; font-weight: 750; letter-spacing: 0; }
    .eyebrow:before { width: 24px; height: 2px; background: var(--coral); content: ""; }
    h1, h2, h3, p { margin-top: 0; }
    h1 { max-width: 720px; margin: 15px 0 17px; color: var(--ink); font-size: clamp(38px, 6vw, 62px); line-height: 1.12; font-weight: 780; }
    .hero-copy { max-width: 650px; margin-bottom: 25px; color: #385b57; font-size: 17px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 11px; }
    .hero-note { margin: 17px 0 0; color: var(--muted); font-size: 12px; }
    .hero-bottom { display: flex; flex-wrap: wrap; gap: 26px; margin-top: 52px; padding-top: 21px; border-top: 1px solid rgba(8,127,120,.17); }
    .hero-stat { min-width: 145px; }
    .hero-stat strong { display: block; color: var(--ink); font-size: 17px; }
    .hero-stat span { color: var(--muted); font-size: 12px; }
    .section { padding: 66px 0; }
    .section-alt { background: #edf7f3; border-block: 1px solid #dfede7; }
    .section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 28px; }
    .section-head > div { max-width: 700px; }
    .section-kicker { margin-bottom: 7px; color: var(--teal); font-size: 11px; font-weight: 750; }
    h2 { margin-bottom: 9px; color: var(--ink); font-size: 30px; line-height: 1.25; }
    .section-intro { margin-bottom: 0; color: var(--muted); }
    .text-link { color: var(--teal-dark); font-size: 13px; font-weight: 700; }
    .intro-layout { display: grid; grid-template-columns: 1.2fr .8fr; gap: 44px; align-items: start; }
    .intro-copy { max-width: 670px; }
    .intro-copy p { margin-bottom: 14px; }
    .model-band { padding: 21px 0; border-block: 1px solid var(--line); }
    .model-band strong { display: block; margin-bottom: 12px; color: var(--ink); font-size: 13px; }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
    .tag-cloud span { padding: 5px 10px; border: 1px solid #cee5dd; border-radius: 3px; color: #426560; background: #f5fbf8; font-size: 12px; }
    .principles { display: grid; grid-template-columns: 1fr 1fr; gap: 0 25px; border-top: 1px solid var(--line); }
    .principle { padding: 15px 0; border-bottom: 1px solid var(--line); }
    .principle strong { display: block; margin-bottom: 3px; color: var(--ink); font-size: 14px; }
    .principle span { color: var(--muted); font-size: 12px; }
    .service-grid { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); }
    .service-item { min-height: 149px; padding: 20px; background: var(--paper); transition: background .2s, transform .2s; }
    .service-item:hover { position: relative; z-index: 1; background: white; transform: translateY(-3px); }
    .service-item .number { color: var(--coral); font-size: 11px; font-weight: 750; }
    .service-item h3 { margin: 7px 0 6px; color: var(--ink); font-size: 16px; }
    .service-item p { margin: 0; color: var(--muted); font-size: 12px; }
    .process { display: grid; grid-template-columns: repeat(5, minmax(0,1fr)); border-top: 1px solid #bedbd0; }
    .step { position: relative; padding: 23px 20px 0 0; }
    .step:before { position: absolute; top: -5px; left: 0; width: 9px; height: 9px; border: 2px solid var(--teal); border-radius: 50%; background: var(--paper); content: ""; }
    .step span { color: var(--teal); font-size: 11px; font-weight: 750; }
    .step h3 { margin: 6px 0; color: var(--ink); font-size: 15px; }
    .step p { margin: 0; color: var(--muted); font-size: 12px; }
    .solution-list { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 22px; }
    .solution { padding: 19px 0 18px; border-top: 2px solid var(--teal); }
    .solution h3 { margin: 0 0 6px; color: var(--ink); font-size: 16px; }
    .solution p { margin: 0; color: var(--muted); font-size: 13px; }
    .network-row { display: grid; grid-template-columns: 180px 1fr; gap: 28px; align-items: start; padding: 22px 0; border-top: 1px solid var(--line); }
    .network-row:last-child { border-bottom: 1px solid var(--line); }
    .network-row strong { color: var(--ink); }
    .network-row p { margin: 0; color: var(--body); }
    .showcase-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 22px; align-items: start; }
    .media-frame { overflow: hidden; background: #e6f2ed; border: 1px solid var(--line); }
    .media-frame img { width: 100%; height: auto; }
    .media-caption { padding: 13px 15px; color: var(--body); font-size: 13px; }
    .showcase-stack { display: grid; gap: 16px; }
    .square-media { max-width: 340px; }
    .review-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 24px; }
    .review { padding: 18px 0; border-top: 1px solid #bddbd0; }
    .review blockquote { margin: 0 0 12px; color: #31534f; font-size: 14px; }
    .review cite { color: var(--muted); font-size: 12px; font-style: normal; }
    .comparison-wrap { overflow-x: auto; border: 1px solid var(--line); background: white; }
    .comparison { width: 100%; min-width: 680px; border-collapse: collapse; text-align: left; }
    .comparison th, .comparison td { padding: 14px 16px; border-bottom: 1px solid var(--line); }
    .comparison th { color: var(--ink); background: #e7f5ef; font-size: 13px; }
    .comparison td { color: var(--body); font-size: 13px; }
    .comparison tr:last-child td { border-bottom: 0; }
    .rating-line { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin-bottom: 22px; }
    .rating-line strong { color: var(--ink); font-size: 24px; }
    .stars { color: #b27625; font-size: 19px; letter-spacing: 2px; }
    .rating-line span:last-child { color: var(--muted); font-size: 13px; }
    .price-band { display: grid; grid-template-columns: 1.2fr .8fr; gap: 35px; align-items: center; padding: 27px 0; border-block: 1px solid var(--line); }
    .price-band h3 { margin-bottom: 6px; color: var(--ink); font-size: 19px; }
    .price-band p { margin: 0; color: var(--muted); }
    .price-note { padding-left: 22px; border-left: 2px solid var(--lime); }
    .faq-list { border-top: 1px solid var(--line); }
    details { border-bottom: 1px solid var(--line); }
    summary { position: relative; padding: 16px 35px 16px 0; color: var(--ink); font-weight: 650; cursor: pointer; list-style: none; }
    summary::-webkit-details-marker { display: none; }
    summary:after { position: absolute; right: 4px; top: 15px; color: var(--teal); font-size: 20px; content: "+"; transition: transform .2s; }
    details[open] summary:after { transform: rotate(45deg); }
    details p { max-width: 850px; margin: -2px 28px 17px 0; color: var(--muted); font-size: 14px; }
    .article-row { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
    .article-link { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 17px 0; border-top: 1px solid var(--line); color: var(--ink); }
    .article-link span { color: var(--teal); font-size: 12px; }
    .contact-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 48px; align-items: start; }
    .contact-info p { margin-bottom: 10px; }
    .contact-info a { color: var(--teal-dark); }
    .qr-wrap { width: 154px; margin-top: 20px; padding: 7px; border: 1px solid var(--line); background: white; }
    .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
    .field { display: grid; gap: 6px; }
    .field-wide { grid-column: 1 / -1; }
    .field label { color: var(--ink); font-size: 13px; font-weight: 650; }
    .field input, .field select, .field textarea { width: 100%; min-height: 45px; padding: 10px 12px; border: 1px solid #cbded6; border-radius: 3px; color: var(--ink); background: white; }
    .field textarea { min-height: 110px; resize: vertical; }
    .field input:focus, .field select:focus, .field textarea:focus { outline: 2px solid #9bd8c7; outline-offset: 1px; }
    .form-submit { margin-top: 17px; }
    .form-note { margin: 10px 0 0; color: var(--muted); font-size: 11px; }
    .affiliate { padding: 32px 0 38px; background: #e8f5f0; border-top: 1px solid var(--line); }
    .affiliate-row { display: flex; align-items: center; justify-content: space-between; gap: 22px; }
    .affiliate-row h2 { margin-bottom: 5px; font-size: 22px; }
    .affiliate-row p { margin: 0; color: var(--muted); }
    .site-footer { padding: 22px 0; background: #f2f8f5; color: #45615b; border-top: 1px solid var(--line); }
    .footer-row { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 15px; font-size: 12px; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 8px 16px; }
    .footer-links a { color: #315750; }
    .float-contact, .to-top { position: fixed; z-index: 15; right: 18px; border: 1px solid #cfe4db; border-radius: 4px; background: white; color: var(--teal-dark); box-shadow: 0 5px 18px rgba(20,65,53,.12); }
    .float-contact { bottom: 72px; padding: 10px 13px; font-size: 12px; font-weight: 700; }
    .to-top { right: 21px; bottom: 20px; width: 39px; height: 39px; display: grid; place-items: center; font-size: 18px; opacity: 0; pointer-events: none; transform: translateY(7px); transition: opacity .2s, transform .2s; }
    .to-top.visible { opacity: 1; pointer-events: auto; transform: translateY(0); }
    .reveal { opacity: 0; transform: translateY(12px); transition: opacity .5s ease, transform .5s ease; }
    .reveal.in-view { opacity: 1; transform: translateY(0); }
    @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: 980px) {
      .header-row { align-items: center; }
      .nav-toggle { display: inline-grid; place-items: center; }
      .desktop-home { display: none; }
      .header-actions { position: relative; }
      .nav-links { display: none; position: absolute; top: calc(100% + 12px); right: 0; width: min(340px, calc(100vw - 40px)); max-height: 72vh; overflow: auto; justify-content: flex-start; padding: 9px; border: 1px solid var(--line); background: white; box-shadow: 0 12px 24px rgba(20,65,53,.12); }
      .nav-links.open { display: flex; }
      .nav-links a { width: 50%; padding: 9px; }
      .service-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
    }
    @media (max-width: 700px) {
      .container { width: min(var(--container), calc(100% - 32px)); }
      .header-row { min-height: 64px; }
      .hero { padding: 58px 0 34px; }
      .hero:after { right: -105px; top: 20px; }
      .hero-copy { font-size: 15px; }
      .hero-bottom { gap: 17px 25px; margin-top: 35px; }
      .hero-stat { min-width: 120px; }
      .section { padding: 49px 0; }
      .section-head { display: block; margin-bottom: 21px; }
      .section-head .text-link { display: inline-block; margin-top: 12px; }
      h2 { font-size: 25px; }
      .intro-layout, .showcase-grid, .contact-grid, .price-band { grid-template-columns: 1fr; gap: 24px; }
      .principles { gap: 0 16px; }
      .process { grid-template-columns: 1fr; gap: 0; border-top: 0; border-left: 1px solid #bedbd0; margin-left: 5px; }
      .step { padding: 0 0 23px 20px; }
      .step:before { top: 2px; left: -5px; }
      .solution-list { grid-template-columns: 1fr 1fr; gap: 10px 20px; }
      .network-row { grid-template-columns: 1fr; gap: 6px; }
      .review-grid { grid-template-columns: 1fr 1fr; gap: 7px 20px; }
      .price-note { padding: 0 0 0 16px; }
      .article-row { grid-template-columns: 1fr; gap: 0; }
      .affiliate-row { align-items: flex-start; flex-direction: column; }
      .footer-row { align-items: flex-start; flex-direction: column; }
    }
    @media (max-width: 440px) {
      .brand-name { font-size: 15px; }
      .ai-page-logo { width: 33px; }
      .service-grid { grid-template-columns: 1fr 1fr; }
      .service-item { min-height: 158px; padding: 15px 13px; }
      .solution-list { grid-template-columns: 1fr; }
      .review-grid { grid-template-columns: 1fr; }
      .form-grid { grid-template-columns: 1fr; }
      .field-wide { grid-column: auto; }
    }