:root {
      color-scheme: light;
      --ink: #17251d;
      --muted: #5d6a61;
      --green: #238344;
      --green-dark: #176333;
      --lime: #c7f264;
      --paper: #f6faf4;
      --line: #dce7dc;
      --white: #fff;
      --orange: #e78a39;
      --shadow: 0 14px 34px rgba(29, 72, 43, .09);
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; scroll-padding-top: 84px; }
    body {
      margin: 0;
      background: var(--paper);
      color: var(--ink);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      line-height: 1.65;
    }
    a { color: inherit; }
    button, input, select, textarea { font: inherit; }
    .container { width: min(1160px, calc(100% - 40px)); margin-inline: auto; }
    .site-header {
      position: sticky;
      z-index: 20;
      top: 0;
      background: rgba(255,255,255,.94);
      border-bottom: 1px solid rgba(220,231,220,.9);
      backdrop-filter: blur(12px);
    }
    .nav-wrap { 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 { display: block; width: 38px; max-width: 100%; height: auto; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; gap: 0; list-style: none; margin: 0; padding: 0; }
    .nav-links a { display: block; padding: 10px 11px; color: #46534a; text-decoration: none; font-size: 14px; white-space: nowrap; transition: color .2s ease; }
    .nav-links a:hover { color: var(--green); }
    .nav-cta, .button {
      display: inline-flex; align-items: center; justify-content: center; gap: 8px;
      border: 0; border-radius: 4px; padding: 12px 18px;
      background: var(--green); color: #fff; text-decoration: none; font-weight: 700;
      cursor: pointer; transition: transform .2s ease, background .2s ease, box-shadow .2s ease;
    }
    .nav-cta { padding: 10px 15px; white-space: nowrap; }
    .button:hover, .nav-cta:hover { transform: translateY(-2px); background: var(--green-dark); box-shadow: 0 8px 20px rgba(35,131,68,.22); }
    .button.light { background: var(--lime); color: #17351f; }
    .button.outline { border: 1px solid #b9d2bb; background: transparent; color: var(--green-dark); }
    .menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 4px; background: #fff; color: var(--ink); cursor: pointer; }
    .hero {
      position: relative; overflow: hidden;
      background: linear-gradient(115deg, #eef8e9 0%, #f8fbf2 55%, #e3f3d7 100%);
      border-bottom: 1px solid var(--line);
    }
    .hero::before {
      content: ""; position: absolute; inset: 0;
      background-image: linear-gradient(rgba(35,131,68,.055) 1px, transparent 1px), linear-gradient(90deg, rgba(35,131,68,.055) 1px, transparent 1px);
      background-size: 38px 38px; mask-image: linear-gradient(to right, transparent 10%, #000 100%); pointer-events: none;
    }
    .hero-inner { position: relative; display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(260px, .7fr); align-items: center; gap: 50px; padding-block: 76px 66px; }
    .eyebrow { display: inline-flex; align-items: center; gap: 8px; color: var(--green-dark); font-weight: 750; font-size: 13px; letter-spacing: 0; }
    .eyebrow::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--green); }
    h1 { max-width: 680px; margin: 18px 0 16px; font-size: clamp(38px, 5vw, 64px); line-height: 1.12; letter-spacing: 0; }
    .hero-copy { max-width: 630px; color: #46564a; font-size: 18px; margin: 0 0 26px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
    .hero-note { margin-top: 18px; color: #627065; font-size: 13px; }
    .hero-panel { border-left: 1px solid rgba(35,131,68,.25); padding: 10px 0 10px 28px; }
    .hero-panel h2 { margin: 0 0 16px; font-size: 16px; }
    .model-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
    .model-cloud span { padding: 7px 10px; border: 1px solid #c9ddc8; background: rgba(255,255,255,.74); color: #35533b; font-size: 13px; }
    .hero-panel p { margin: 17px 0 0; color: var(--muted); font-size: 14px; }
    .metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; background: #fff; border-bottom: 1px solid var(--line); }
    .metric { padding: 22px 18px; text-align: center; border-right: 1px solid var(--line); }
    .metric:last-child { border-right: 0; }
    .metric strong { display: block; color: var(--green-dark); font-size: 21px; }
    .metric span { color: var(--muted); font-size: 13px; }
    main { overflow: hidden; }
    section.content-section { padding: 76px 0; }
    section.content-section:nth-of-type(even) { background: #fff; }
    .section-heading { max-width: 720px; margin-bottom: 32px; }
    .section-heading h2 { margin: 8px 0 10px; font-size: 34px; line-height: 1.2; letter-spacing: 0; }
    .section-heading p { margin: 0; color: var(--muted); }
    .intro-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; align-items: start; }
    .intro-layout p { margin-top: 0; color: #4d5c51; }
    .check-list { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 18px; margin: 0; padding: 0; list-style: none; }
    .check-list li { padding: 12px 0; border-bottom: 1px solid var(--line); font-weight: 650; }
    .check-list li::before { content: "✓"; color: var(--green); margin-right: 9px; font-weight: 800; }
    .service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
    .service-item { padding: 20px; border: 1px solid var(--line); background: #fff; transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease; }
    .service-item:hover { transform: translateY(-4px); border-color: #9dc49f; box-shadow: var(--shadow); }
    .service-item .num { color: var(--green); font-size: 12px; font-weight: 800; }
    .service-item h3 { margin: 8px 0 7px; font-size: 18px; }
    .service-item p { margin: 0; color: var(--muted); font-size: 14px; }
    .band { padding: 28px; background: #e9f5e4; border-left: 4px solid var(--green); }
    .band strong { display: block; margin-bottom: 6px; font-size: 19px; }
    .band p { margin: 0; color: #4d5c51; }
    .steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; counter-reset: step; }
    .step { position: relative; padding: 8px 24px 8px 0; }
    .step:not(:last-child)::after { content: ""; position: absolute; top: 24px; left: 52px; right: 10px; height: 1px; background: #b6d0b7; }
    .step b { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 50%; background: var(--green); color: #fff; font-size: 14px; }
    .step h3 { margin: 15px 0 5px; font-size: 17px; }
    .step p { margin: 0; color: var(--muted); font-size: 14px; }
    .solution-layout { display: grid; grid-template-columns: .85fr 1.15fr; gap: 32px; align-items: start; }
    .solution-list { display: grid; gap: 10px; }
    .solution-row { display: grid; grid-template-columns: 130px 1fr; gap: 16px; padding: 13px 0; border-bottom: 1px solid var(--line); }
    .solution-row strong { color: var(--green-dark); }
    .solution-row span { color: var(--muted); font-size: 14px; }
    .service-network { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
    .network-item { padding: 22px; background: #fff; }
    .network-item h3 { margin: 0 0 8px; font-size: 17px; }
    .network-item p { margin: 0; color: var(--muted); font-size: 14px; }
    .comparison-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 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
    th { background: #eaf5e6; color: #21492c; font-size: 14px; }
    td { color: #526056; font-size: 14px; }
    tr:last-child td { border-bottom: 0; }
    .rating { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 18px; margin-bottom: 20px; padding: 20px 24px; background: #183d27; color: #fff; }
    .rating strong { font-size: 26px; }
    .rating span { color: #e2f4cf; }
    .stars { color: var(--lime); letter-spacing: 0; font-size: 20px; }
    .case-grid, .review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .case-item { overflow: hidden; background: #fff; border: 1px solid var(--line); }
    .image-frame { aspect-ratio: 16 / 9; overflow: hidden; background: #e8f1e5; }
    .image-frame img { display: block; width: 100%; height: 100%; object-fit: cover; }
    .case-copy { padding: 16px; }
    .case-copy h3 { margin: 0 0 6px; font-size: 17px; }
    .case-copy p { margin: 0; color: var(--muted); font-size: 14px; }
    .review { padding: 20px; border-top: 3px solid #7dbb64; background: #fff; }
    .review p { margin: 0 0 18px; color: #46564a; font-size: 14px; }
    .review strong { display: block; font-size: 14px; }
    .review span { color: var(--muted); font-size: 12px; }
    .token-table { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
    .token-item { padding: 18px; background: #eef6e9; border-bottom: 2px solid #8ab86e; }
    .token-item strong { display: block; margin-bottom: 5px; }
    .token-item span { color: var(--muted); font-size: 13px; }
    .article-list { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
    .article-link { display: flex; min-height: 98px; flex-direction: column; justify-content: space-between; padding: 15px; border: 1px solid var(--line); background: #fff; text-decoration: none; transition: border-color .2s ease, transform .2s ease; }
    .article-link:hover { transform: translateY(-3px); border-color: var(--green); }
    .article-link strong { font-size: 14px; }
    .article-link span { color: var(--green-dark); font-size: 12px; }
    .faq-list { border-top: 1px solid var(--line); }
    .faq-item { border-bottom: 1px solid var(--line); }
    .faq-item summary { position: relative; padding: 17px 38px 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: 12px; color: var(--green); font-size: 24px; font-weight: 400; }
    .faq-item[open] summary::after { content: "−"; }
    .faq-item p { max-width: 850px; margin: -4px 0 18px; color: var(--muted); }
    .contact-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 40px; align-items: start; }
    .contact-details { display: grid; gap: 12px; margin-top: 24px; }
    .contact-details p { margin: 0; color: #4d5c51; }
    .contact-details a { color: var(--green-dark); }
    .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%; border: 1px solid #ccd9cd; border-radius: 3px; padding: 11px 12px; background: #fff; color: var(--ink); outline: none; }
    .field input:focus, .field select:focus, .field textarea:focus { border-color: var(--green); box-shadow: 0 0 0 3px rgba(35,131,68,.1); }
    .field textarea { min-height: 112px; resize: vertical; }
    .contact-form .button { justify-self: start; }
    .qr { width: 132px; height: 132px; object-fit: contain; border: 1px solid var(--line); background: #fff; }
    .join-band { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 26px; background: #dff0d7; }
    .join-band h2 { margin: 0 0 4px; font-size: 22px; }
    .join-band p { margin: 0; color: #4d5c51; }
    .footer { background: #edf4e9; border-top: 1px solid var(--line); color: #26372a; }
    .footer-inner { display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: start; padding-block: 30px 22px; }
    .footer p { margin: 7px 0; color: #536157; font-size: 13px; }
    .friend-links { display: flex; flex-wrap: wrap; gap: 8px 18px; justify-content: flex-end; }
    .friend-links a { color: #315c38; font-size: 13px; text-decoration: none; }
    .copyright { padding: 12px 0 18px; border-top: 1px solid #d6e2d4; color: #5a675d; font-size: 12px; }
    .float-tools { position: fixed; z-index: 15; right: 18px; bottom: 20px; display: grid; gap: 8px; }
    .float-tools a { display: grid; place-items: center; width: 46px; min-height: 46px; padding: 4px; border: 1px solid #d3e3d1; background: #fff; color: var(--green-dark); text-align: center; text-decoration: none; font-size: 11px; box-shadow: 0 5px 18px rgba(29,72,43,.12); }
    .reveal { opacity: 0; transform: translateY(16px); transition: opacity .55s ease, transform .55s ease; }
    .reveal.is-visible { 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-cta { display: none; }
      .nav-links { display: none; position: absolute; top: 72px; left: 0; right: 0; padding: 10px 20px 16px; border-bottom: 1px solid var(--line); background: #fff; align-items: stretch; flex-direction: column; }
      .nav-links.is-open { display: flex; }
      .nav-links a { padding: 11px 4px; border-bottom: 1px solid #edf1ed; }
      .hero-inner { grid-template-columns: 1fr; gap: 30px; padding-block: 58px; }
      .hero-panel { border-left: 0; border-top: 1px solid rgba(35,131,68,.25); padding: 22px 0 0; }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .article-list { grid-template-columns: repeat(3, 1fr); }
    }
    @media (max-width: 680px) {
      .container { width: min(100% - 30px, 1160px); }
      .nav-wrap { min-height: 64px; }
      .nav-links { top: 64px; }
      .hero-inner { padding-block: 48px 42px; }
      h1 { font-size: 40px; }
      .hero-copy { font-size: 16px; }
      .metrics { grid-template-columns: repeat(2, 1fr); }
      .metric:nth-child(2) { border-right: 0; }
      .metric:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
      section.content-section { padding: 54px 0; }
      .section-heading h2 { font-size: 28px; }
      .intro-layout, .solution-layout, .contact-layout { grid-template-columns: 1fr; gap: 24px; }
      .service-grid, .case-grid, .review-grid { grid-template-columns: 1fr; }
      .steps { grid-template-columns: 1fr 1fr; gap: 22px 10px; }
      .step:not(:last-child)::after { display: none; }
      .service-network { grid-template-columns: 1fr; }
      .solution-row { grid-template-columns: 1fr; gap: 2px; }
      .token-table { grid-template-columns: 1fr; }
      .article-list { grid-template-columns: 1fr 1fr; }
      .check-list { grid-template-columns: 1fr; }
      .join-band { align-items: flex-start; flex-direction: column; }
      .footer-inner { grid-template-columns: 1fr; }
      .friend-links { justify-content: flex-start; }
      .contact-form { grid-template-columns: 1fr; }
      .field.full { grid-column: auto; }
      .rating { align-items: flex-start; flex-direction: column; }
    }