:root {
      color-scheme: light;
      --ink: #172b27;
      --muted: #5e716c;
      --green: #16745d;
      --green-dark: #105743;
      --lime: #d8f36a;
      --mint: #e9f6ef;
      --paper: #f7faf8;
      --white: #fff;
      --line: #dce8e1;
      --coral: #f08b62;
      --shadow: 0 12px 32px rgba(25, 65, 48, .08);
      --container: 1160px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      font-family: -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, input, select, textarea { -webkit-tap-highlight-color: transparent; }
    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(247,250,248,.94); border-bottom: 1px solid rgba(220,232,225,.85); backdrop-filter: blur(14px); }
    .nav-wrap { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 22px; }
    .brand { display: inline-flex; align-items: center; gap: 10px; flex: 0 0 auto; font-size: 17px; font-weight: 800; }
    .ai-page-logo { width: 38px; height: 38px; object-fit: contain; }
    .nav-right { display: flex; align-items: center; justify-content: flex-end; gap: 16px; }
    .nav-links { display: flex; align-items: center; gap: 0; }
    .nav-links a { padding: 10px 11px; color: #405650; font-size: 13px; white-space: nowrap; transition: color .2s; }
    .nav-links a:hover { color: var(--green); }
    .nav-cta, .button { display: inline-flex; justify-content: center; align-items: center; gap: 8px; min-height: 44px; padding: 10px 18px; color: #fff; background: var(--green); border: 1px solid var(--green); border-radius: 5px; font-weight: 700; transition: transform .2s, background .2s, box-shadow .2s; }
    .nav-cta { min-height: 40px; padding: 8px 14px; font-size: 13px; white-space: nowrap; }
    .button:hover, .nav-cta:hover { background: var(--green-dark); box-shadow: 0 7px 18px rgba(22,116,93,.2); transform: translateY(-2px); }
    .button.secondary { background: #fff; color: var(--green-dark); border-color: #a9c9b8; }
    .button.secondary:hover { background: var(--mint); }
    .menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); background: #fff; color: var(--ink); border-radius: 5px; cursor: pointer; }
    .hero { overflow: hidden; position: relative; padding: 74px 0 42px; background: #eaf5ee; border-bottom: 1px solid #dcece2; }
    .hero::before { content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .34; background-image: linear-gradient(rgba(22,116,93,.08) 1px, transparent 1px), linear-gradient(90deg, rgba(22,116,93,.08) 1px, transparent 1px); background-size: 42px 42px; mask-image: linear-gradient(to bottom, #000, transparent 88%); }
    .hero-inner { position: relative; display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(260px, .75fr); gap: 50px; align-items: center; }
    .eyebrow { display: inline-flex; align-items: center; gap: 9px; color: var(--green-dark); font-size: 13px; font-weight: 800; }
    .eyebrow::before { content: ""; width: 24px; height: 2px; background: var(--coral); }
    h1 { max-width: 740px; margin: 18px 0 16px; font-size: clamp(38px, 5.4vw, 62px); line-height: 1.13; letter-spacing: 0; }
    .hero-copy { max-width: 650px; color: #435c53; font-size: 17px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
    .hero-note { margin-top: 15px; color: #62766f; font-size: 13px; }
    .hero-panel { padding: 25px; background: rgba(255,255,255,.82); border: 1px solid #d5e6dc; border-radius: 8px; box-shadow: var(--shadow); animation: rise .65s ease both; }
    .hero-panel h2 { margin: 0 0 18px; font-size: 17px; }
    .model-lines { display: grid; gap: 11px; }
    .model-line { display: flex; justify-content: space-between; gap: 12px; padding-bottom: 10px; border-bottom: 1px solid #e5eee9; font-size: 13px; }
    .model-line:last-child { padding-bottom: 0; border: 0; }
    .model-line strong { color: var(--green-dark); }
    .hero-panel p { margin: 18px 0 0; color: var(--muted); font-size: 12px; }
    .metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; padding: 24px 0; }
    .metric { padding: 4px 22px; border-right: 1px solid var(--line); }
    .metric:first-child { padding-left: 0; }
    .metric:last-child { border: 0; }
    .metric strong { display: block; color: var(--green-dark); font-size: 20px; }
    .metric span { color: var(--muted); font-size: 12px; }
    .band { padding: 72px 0; }
    .band.alt { background: #eef6f0; border-block: 1px solid #e0ece4; }
    .section-head { display: flex; justify-content: space-between; align-items: end; gap: 28px; margin-bottom: 30px; }
    .section-head h2 { margin: 0; font-size: clamp(27px, 3.5vw, 38px); line-height: 1.2; }
    .section-head p { max-width: 560px; margin: 0; color: var(--muted); }
    .kicker { margin: 0 0 9px; color: var(--green); font-size: 12px; font-weight: 800; }
    .intro-grid { display: grid; grid-template-columns: .85fr 1.15fr; gap: 46px; align-items: start; }
    .intro-grid h2 { margin: 0 0 14px; font-size: 34px; line-height: 1.25; }
    .intro-grid p { margin: 0 0 15px; color: var(--muted); }
    .capability-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 24px; }
    .capability { display: flex; gap: 14px; padding: 16px 0; border-top: 1px solid var(--line); }
    .capability b { color: var(--green); font-size: 13px; }
    .capability h3 { margin: 0 0 4px; font-size: 15px; }
    .capability p { margin: 0; color: var(--muted); font-size: 13px; }
    .service-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
    .service-item { min-height: 152px; padding: 19px; background: #fff; border: 1px solid var(--line); border-radius: 5px; transition: transform .2s, box-shadow .2s, border-color .2s; }
    .service-item:hover { transform: translateY(-4px); border-color: #a5c9b5; box-shadow: var(--shadow); }
    .service-item .index { color: var(--coral); font-size: 11px; font-weight: 800; }
    .service-item h3 { margin: 8px 0 6px; font-size: 16px; }
    .service-item p { margin: 0; color: var(--muted); font-size: 12px; }
    .workflow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 18px; counter-reset: step; }
    .step { position: relative; padding: 18px 14px 15px 0; border-top: 2px solid #9fcbb2; counter-increment: step; }
    .step::before { content: "0" counter(step); color: var(--green); font-size: 12px; font-weight: 800; }
    .step h3 { margin: 8px 0 5px; font-size: 15px; }
    .step p { margin: 0; color: var(--muted); font-size: 12px; }
    .solutions { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .solution { padding: 22px 0; border-top: 3px solid var(--green); }
    .solution:nth-child(2) { border-color: var(--coral); }
    .solution:nth-child(3) { border-color: #b3cf3b; }
    .solution h3 { margin: 0 0 9px; font-size: 19px; }
    .solution p { margin: 0; color: var(--muted); font-size: 14px; }
    .network { display: flex; flex-wrap: wrap; gap: 9px; padding: 22px; border: 1px solid var(--line); background: #fff; }
    .network span { padding: 7px 11px; color: #284c40; background: #edf6ef; border-radius: 3px; font-size: 13px; }
    .network-note { margin: 12px 0 0; color: var(--muted); font-size: 13px; }
    .review-score { display: flex; align-items: center; gap: 18px; margin-bottom: 22px; padding: 18px 22px; background: #e5f2e9; border-left: 4px solid var(--green); }
    .review-score strong { font-size: 34px; color: var(--green-dark); }
    .stars { color: #d37937; letter-spacing: 0; font-size: 19px; }
    .table-wrap { overflow-x: auto; border: 1px solid var(--line); background: #fff; }
    table { width: 100%; min-width: 700px; border-collapse: collapse; text-align: left; }
    th, td { padding: 14px 17px; border-bottom: 1px solid #e5ece7; vertical-align: top; }
    th { color: #355347; background: #edf5ef; font-size: 13px; }
    td { color: #4e625b; font-size: 13px; }
    tr:last-child td { border-bottom: 0; }
    td:first-child { color: var(--ink); font-weight: 700; }
    .case-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 24px; align-items: start; }
    .case-feature { padding: 24px; background: #174f40; color: #fff; border-radius: 5px; }
    .case-feature .kicker { color: #d8f36a; }
    .case-feature h3 { margin: 0 0 10px; font-size: 24px; }
    .case-feature p { margin: 0; color: #e0eee8; }
    .case-image { margin-top: 18px; }
    .case-image img { display: block; width: 100%; border-radius: 3px; }
    .case-side { display: grid; gap: 14px; }
    .case-row { padding: 18px 0; border-bottom: 1px solid var(--line); }
    .case-row h3 { margin: 0 0 5px; font-size: 16px; }
    .case-row p { margin: 0; color: var(--muted); font-size: 13px; }
    .quote-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
    .quote { padding: 20px; background: #fff; border: 1px solid var(--line); border-radius: 5px; }
    .quote p { margin: 0 0 16px; color: #41574f; font-size: 14px; }
    .quote footer { color: var(--muted); font-size: 12px; }
    .quote footer strong { display: block; color: var(--ink); font-size: 13px; }
    .article-list { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }
    .article { display: flex; min-height: 118px; flex-direction: column; justify-content: space-between; padding: 17px; border: 1px solid var(--line); background: #fff; transition: border-color .2s, transform .2s; }
    .article:hover { border-color: #8cbea3; transform: translateY(-3px); }
    .article small { color: var(--green); font-size: 11px; }
    .article strong { font-size: 14px; line-height: 1.5; }
    .faq-list { border-top: 1px solid var(--line); }
    .faq-item { border-bottom: 1px solid var(--line); }
    .faq-item summary { position: relative; padding: 17px 40px 17px 0; cursor: pointer; list-style: none; font-weight: 700; }
    .faq-item summary::-webkit-details-marker { display: none; }
    .faq-item summary::after { content: "+"; position: absolute; right: 5px; top: 13px; color: var(--green); font-size: 23px; font-weight: 400; }
    .faq-item[open] summary::after { content: "−"; }
    .faq-item p { max-width: 850px; margin: -3px 0 17px; color: var(--muted); font-size: 14px; }
    .contact-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 44px; align-items: start; }
    .contact-info h2 { margin: 0 0 12px; font-size: 32px; }
    .contact-info > p { color: var(--muted); }
    .contact-list { display: grid; gap: 9px; margin-top: 20px; color: #40584f; font-size: 14px; }
    .contact-list a { color: var(--green-dark); text-decoration: underline; text-underline-offset: 3px; }
    .form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
    .field { display: grid; gap: 6px; }
    .field.full { grid-column: 1 / -1; }
    .field label { color: #40584f; font-size: 13px; font-weight: 700; }
    .field input, .field select, .field textarea { width: 100%; padding: 11px 12px; color: var(--ink); background: #fff; border: 1px solid #cbdcd1; border-radius: 4px; outline: none; }
    .field input:focus, .field select:focus, .field textarea:focus { border-color: var(--green); box-shadow: 0 0 0 3px rgba(22,116,93,.1); }
    .field textarea { min-height: 115px; resize: vertical; }
    .submit-row { display: flex; flex-wrap: wrap; align-items: center; gap: 14px; margin-top: 14px; }
    .form-note { color: var(--muted); font-size: 12px; }
    .join-strip { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding: 24px 0 0; border-top: 1px solid var(--line); }
    .join-strip h3 { margin: 0; font-size: 19px; }
    .join-strip p { margin: 5px 0 0; color: var(--muted); font-size: 13px; }
    .footer { padding: 27px 0; color: #dce9e1; background: #183c32; }
    .footer-top { display: flex; justify-content: space-between; align-items: center; gap: 22px; }
    .footer-brand { font-weight: 800; color: #fff; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 8px 17px; color: #dce9e1; font-size: 12px; }
    .footer-links a:hover { color: var(--lime); }
    .copyright { margin-top: 15px; padding-top: 13px; border-top: 1px solid rgba(255,255,255,.16); color: #c0d1c8; font-size: 11px; }
    .float-contact { position: fixed; right: 18px; bottom: 20px; z-index: 15; display: grid; gap: 8px; }
    .float-contact a { display: grid; width: 48px; height: 48px; place-items: center; color: #fff; background: var(--green); border: 1px solid #fff; border-radius: 50%; box-shadow: 0 5px 18px rgba(20,64,48,.22); font-size: 12px; font-weight: 700; transition: transform .2s; }
    .float-contact a:hover { transform: translateY(-3px); }
    .reveal { opacity: 0; transform: translateY(14px); transition: opacity .55s ease, transform .55s ease; }
    .reveal.is-visible { opacity: 1; transform: translateY(0); }
    @keyframes rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
    @media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; } .reveal { opacity: 1; transform: none; } }
    @media (max-width: 980px) {
      .menu-toggle { display: inline-grid; place-items: center; }
      .nav-right { gap: 9px; }
      .nav-links { display: none; position: absolute; top: 73px; left: 0; right: 0; padding: 12px 20px 17px; background: var(--paper); border-bottom: 1px solid var(--line); box-shadow: var(--shadow); }
      .nav-links.open { display: grid; grid-template-columns: repeat(2, 1fr); }
      .nav-links a { padding: 10px 8px; }
      .hero-inner { gap: 28px; }
      .service-grid { grid-template-columns: repeat(3, 1fr); }
      .article-list { grid-template-columns: repeat(3, 1fr); }
    }
    @media (max-width: 700px) {
      .container { width: min(var(--container), calc(100% - 32px)); }
      .nav-wrap { min-height: 66px; }
      .nav-links { top: 65px; }
      .brand { font-size: 15px; }
      .ai-page-logo { width: 33px; height: 33px; }
      .hero { padding: 50px 0 25px; }
      .hero-inner, .intro-grid, .case-grid, .contact-grid { grid-template-columns: 1fr; }
      .hero-inner { gap: 25px; }
      .hero-copy { font-size: 15px; }
      .hero-panel { padding: 19px; }
      .metrics { grid-template-columns: repeat(2, 1fr); gap: 16px 0; }
      .metric { padding: 2px 13px; }
      .metric:nth-child(odd) { padding-left: 0; }
      .metric:nth-child(even) { border-right: 0; }
      .band { padding: 52px 0; }
      .section-head { display: block; }
      .section-head p { margin-top: 10px; }
      .intro-grid { gap: 20px; }
      .capability-list { grid-template-columns: 1fr; }
      .service-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
      .service-item { min-height: 145px; padding: 15px; }
      .workflow { grid-template-columns: 1fr; gap: 3px; }
      .step { padding: 13px 0; }
      .solutions { grid-template-columns: 1fr; gap: 8px; }
      .quote-grid { grid-template-columns: 1fr; }
      .article-list { grid-template-columns: repeat(2, 1fr); gap: 9px; }
      .article { min-height: 110px; padding: 13px; }
      .form-grid { grid-template-columns: 1fr; }
      .field.full { grid-column: auto; }
      .join-strip, .footer-top { align-items: flex-start; flex-direction: column; }
      .review-score { gap: 12px; padding: 15px; }
      .review-score strong { font-size: 29px; }
      .float-contact { right: 12px; bottom: 12px; }
      .float-contact a { width: 44px; height: 44px; }
    }