:root {
      color-scheme: light;
      --ink: #1e2923;
      --muted: #5e6b62;
      --line: #dfe8d9;
      --paper: #f6faef;
      --white: #fff;
      --green: #4e9c36;
      --green-dark: #226b36;
      --lime: #c9ee55;
      --mint: #e8f4df;
      --orange: #ec8b4f;
      --container: 1160px;
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      background: var(--paper);
      color: var(--ink);
      font-family: Inter, ui-sans-serif, 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; }
    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(246,250,239,.96); border-bottom: 1px solid rgba(34,107,54,.12); backdrop-filter: blur(12px); }
    .header-inner { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
    .brand { display: inline-flex; align-items: center; flex: 0 0 auto; }
    .brand img { width: 142px; max-height: 48px; object-fit: contain; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; gap: 0; flex-wrap: wrap; }
    .nav-links a { padding: 8px 9px; color: #35443a; font-size: 13px; white-space: nowrap; transition: color .2s ease; }
    .nav-links a:hover { color: var(--green-dark); }
    .header-cta, .button { display: inline-flex; min-height: 44px; align-items: center; justify-content: center; gap: 8px; padding: 0 18px; border: 1px solid var(--green-dark); border-radius: 4px; background: var(--green-dark); color: #fff; font-weight: 700; transition: transform .2s ease, background .2s ease, box-shadow .2s ease; }
    .header-cta { flex: 0 0 auto; }
    .button:hover, .header-cta:hover { background: #174f29; box-shadow: 0 8px 20px rgba(34,107,54,.16); transform: translateY(-2px); }
    .button.secondary { background: transparent; color: var(--green-dark); }
    .button.secondary:hover { background: var(--mint); }
    .menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 4px; background: #fff; color: var(--ink); cursor: pointer; }
    .menu-toggle span, .menu-toggle::before, .menu-toggle::after { display: block; width: 18px; height: 2px; margin: 4px auto; background: currentColor; content: ""; }

    .hero { overflow: hidden; position: relative; padding: 72px 0 46px; background: #eaf5dc; border-bottom: 1px solid #d9e9cb; }
    .hero::before { position: absolute; top: -170px; right: -115px; width: 460px; height: 460px; border: 1px solid rgba(78,156,54,.2); border-radius: 50%; content: ""; }
    .hero::after { position: absolute; top: -95px; right: -40px; width: 310px; height: 310px; border: 1px solid rgba(78,156,54,.2); border-radius: 50%; content: ""; }
    .hero-inner { position: relative; z-index: 1; display: grid; grid-template-columns: minmax(0,1.25fr) minmax(260px,.75fr); align-items: center; gap: 64px; }
    .eyebrow { display: inline-flex; align-items: center; gap: 9px; margin: 0 0 16px; color: var(--green-dark); font-size: 13px; font-weight: 800; text-transform: uppercase; }
    .eyebrow::before { width: 26px; height: 3px; background: var(--orange); content: ""; }
    h1 { max-width: 700px; margin: 0; font-size: clamp(38px, 5vw, 66px); line-height: 1.13; font-weight: 800; }
    .hero-copy { max-width: 650px; margin: 22px 0 28px; color: #48584d; font-size: 17px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
    .hero-note { margin: 18px 0 0; color: #58685b; font-size: 13px; }
    .hero-console { position: relative; padding: 24px; border: 1px solid #c8ddb9; background: rgba(255,255,255,.72); box-shadow: 14px 14px 0 #d6e8c8; }
    .console-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-bottom: 17px; border-bottom: 1px solid var(--line); }
    .console-title { font-size: 14px; font-weight: 800; }
    .live-mark { display: inline-flex; align-items: center; gap: 7px; color: #34713a; font-size: 12px; }
    .live-mark::before { width: 8px; height: 8px; border-radius: 50%; background: #65b747; content: ""; box-shadow: 0 0 0 4px rgba(101,183,71,.13); }
    .console-row { display: flex; justify-content: space-between; gap: 12px; padding: 13px 0; border-bottom: 1px solid #edf1e8; color: #536257; font-size: 13px; }
    .console-row strong { color: var(--ink); text-align: right; }
    .console-footer { display: flex; align-items: center; gap: 12px; margin-top: 17px; padding: 13px; background: #eff7e6; color: #315c35; font-size: 13px; }
    .console-icon { display: grid; width: 34px; height: 34px; flex: 0 0 auto; place-items: center; border-radius: 50%; background: var(--lime); color: #244d2d; font-weight: 900; }

    .metrics { padding: 22px 0; background: #fff; border-bottom: 1px solid var(--line); }
    .metrics-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 18px; }
    .metric { padding: 7px 18px; border-left: 2px solid var(--lime); }
    .metric strong { display: block; color: var(--green-dark); font-size: 20px; line-height: 1.3; }
    .metric span { color: var(--muted); font-size: 13px; }

    .section { padding: 76px 0; }
    .section.light { background: #fff; }
    .section.green { background: #edf5e5; }
    .section-head { display: flex; align-items: end; justify-content: space-between; gap: 28px; margin-bottom: 32px; }
    .section-head > div { max-width: 700px; }
    .section-kicker { margin: 0 0 8px; color: var(--green-dark); font-size: 12px; font-weight: 800; text-transform: uppercase; }
    h2 { margin: 0; font-size: clamp(27px, 3.1vw, 40px); line-height: 1.2; }
    .section-intro { max-width: 650px; margin: 12px 0 0; color: var(--muted); }
    h3 { margin: 0; font-size: 18px; line-height: 1.4; }
    .intro-layout { display: grid; grid-template-columns: 1.1fr .9fr; gap: 50px; align-items: start; }
    .intro-text { max-width: 650px; color: #536157; }
    .intro-text p:first-child { margin-top: 0; }
    .intro-aside { padding: 24px 0 24px 25px; border-left: 3px solid var(--lime); }
    .intro-aside p { margin: 0 0 14px; color: #435248; }
    .tag-list { display: flex; flex-wrap: wrap; gap: 8px; }
    .tag { display: inline-flex; padding: 6px 10px; border: 1px solid #d6e4ce; background: #f8fbf4; color: #375b3b; font-size: 12px; }

    .services-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 1px; background: #dce7d6; border: 1px solid #dce7d6; }
    .service-item { min-height: 180px; padding: 22px; background: #fff; transition: background .2s ease, transform .2s ease; }
    .service-item:hover { position: relative; z-index: 1; background: #f6faef; transform: translateY(-3px); }
    .service-number { display: block; margin-bottom: 22px; color: #77a35a; font-size: 12px; font-weight: 800; }
    .service-item p { margin: 9px 0 0; color: var(--muted); font-size: 14px; }
    .service-more { display: inline-block; margin-top: 25px; color: var(--green-dark); font-size: 14px; font-weight: 700; }

    .workflow { display: grid; grid-template-columns: repeat(4,1fr); gap: 22px; counter-reset: steps; }
    .step { position: relative; padding: 18px 20px 18px 0; border-top: 2px solid #b9d5a7; counter-increment: steps; }
    .step::before { display: block; margin-bottom: 17px; color: var(--green-dark); font-size: 13px; font-weight: 800; content: "STEP 0" counter(steps); }
    .step p { margin: 9px 0 0; color: var(--muted); font-size: 14px; }

    .solution-strip { display: grid; grid-template-columns: repeat(3,1fr); gap: 28px; }
    .solution { padding: 18px 20px 18px 0; border-bottom: 1px solid #cbdcc0; }
    .solution p { margin: 8px 0 0; color: var(--muted); font-size: 14px; }

    .network-band { display: grid; grid-template-columns: .7fr 1.3fr; gap: 48px; align-items: start; }
    .network-copy { max-width: 380px; color: var(--muted); }
    .model-cloud { display: flex; flex-wrap: wrap; gap: 9px; }
    .model-cloud span { padding: 8px 12px; border: 1px solid #cfdfc4; background: #fff; color: #35483a; font-size: 13px; }

    .case-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
    .case { overflow: hidden; background: #fff; border: 1px solid var(--line); }
    .case img { width: 100%; aspect-ratio: 16 / 7; object-fit: cover; }
    .case-body { padding: 20px 22px 22px; }
    .case-body p { margin: 8px 0 0; color: var(--muted); font-size: 14px; }

    .review-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
    .review { padding: 20px; border-top: 3px solid #9bc86e; background: #fff; }
    .review p { margin: 0 0 20px; color: #49584d; font-size: 14px; }
    .review strong { display: block; font-size: 13px; }
    .review span { color: var(--muted); font-size: 12px; }

    .comparison-layout { display: grid; grid-template-columns: 260px 1fr; gap: 34px; align-items: start; }
    .rating-panel { padding: 24px; background: #e9f3dc; border-left: 4px solid var(--green); }
    .rating-panel .score { margin: 8px 0 0; color: var(--green-dark); font-size: 42px; font-weight: 800; line-height: 1; }
    .stars { color: #d7832f; font-size: 19px; letter-spacing: 2px; }
    .rating-panel p { margin: 12px 0 0; color: #4f6053; font-size: 13px; }
    .table-wrap { overflow-x: auto; background: #fff; border: 1px solid var(--line); }
    table { width: 100%; min-width: 680px; border-collapse: collapse; text-align: left; }
    th, td { padding: 13px 15px; border-bottom: 1px solid #e7ede3; font-size: 13px; }
    th { background: #f0f6e9; color: #2c4731; }
    td { color: #526056; }
    td:first-child { color: var(--ink); font-weight: 700; }
    .check { color: var(--green-dark); font-weight: 800; }

    .article-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 0 24px; border-top: 1px solid var(--line); }
    .article-link { display: flex; align-items: center; justify-content: space-between; gap: 14px; min-height: 58px; padding: 12px 0; border-bottom: 1px solid var(--line); color: #35443a; font-size: 14px; }
    .article-link::after { color: var(--green); content: "↗"; }
    .article-link:hover { color: var(--green-dark); }

    .faq-list { max-width: 880px; border-top: 1px solid #d6e2d0; }
    .faq-item { border-bottom: 1px solid #d6e2d0; }
    .faq-item summary { position: relative; padding: 17px 38px 17px 0; cursor: pointer; font-weight: 700; list-style: none; }
    .faq-item summary::-webkit-details-marker { display: none; }
    .faq-item summary::after { position: absolute; top: 16px; right: 4px; color: var(--green-dark); font-size: 20px; content: "+"; transition: transform .2s ease; }
    .faq-item[open] summary::after { transform: rotate(45deg); }
    .faq-item p { max-width: 760px; margin: 0; padding: 0 0 18px; color: var(--muted); font-size: 14px; }

    .contact-layout { display: grid; grid-template-columns: .75fr 1.25fr; gap: 54px; align-items: start; }
    .contact-copy p { color: var(--muted); }
    .contact-details { display: grid; gap: 12px; margin-top: 22px; }
    .contact-details a, .contact-details span { color: #31593a; font-weight: 700; }
    .contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
    .field { display: grid; gap: 6px; }
    .field.full { grid-column: 1 / -1; }
    label { color: #35443a; font-size: 13px; font-weight: 700; }
    input, select, textarea { width: 100%; min-height: 46px; padding: 10px 12px; border: 1px solid #cfdcc9; border-radius: 3px; background: #fff; color: var(--ink); outline: none; }
    input:focus, select:focus, textarea:focus { border-color: var(--green); box-shadow: 0 0 0 3px rgba(78,156,54,.12); }
    textarea { min-height: 120px; resize: vertical; }
    .form-footnote { grid-column: 1 / -1; margin: -3px 0 0; color: var(--muted); font-size: 12px; }

    .join-band { padding: 34px 0; background: #dff0ca; }
    .join-inner { display: flex; align-items: center; justify-content: space-between; gap: 22px; }
    .join-inner p { margin: 7px 0 0; color: #4e6252; }
    .site-footer { padding: 34px 0 24px; background: #e9f1e2; color: #26382b; border-top: 1px solid #d4e0cc; }
    .footer-top { display: grid; grid-template-columns: 1.1fr .9fr; gap: 30px; padding-bottom: 24px; border-bottom: 1px solid #cfdbc8; }
    .footer-brand img { width: 132px; max-height: 44px; object-fit: contain; }
    .footer-brand p { max-width: 480px; color: #566459; font-size: 13px; }
    .footer-links { display: flex; align-content: start; flex-wrap: wrap; gap: 8px 18px; }
    .footer-links a { color: #3c5541; font-size: 13px; }
    .footer-bottom { display: flex; justify-content: space-between; gap: 15px; padding-top: 18px; color: #58675c; font-size: 12px; }
    .floating-help { position: fixed; right: 18px; bottom: 22px; z-index: 15; display: grid; gap: 8px; }
    .floating-help a { display: flex; align-items: center; justify-content: center; min-width: 48px; min-height: 46px; padding: 0 13px; border: 1px solid #caddbe; background: #fff; color: var(--green-dark); box-shadow: 0 5px 18px rgba(31,65,34,.1); font-size: 13px; font-weight: 700; }
    .floating-help a:hover { background: var(--lime); }
    .back-top { display: none !important; }
    .back-top.visible { display: flex !important; }
    .reveal { opacity: 0; transform: translateY(14px); transition: opacity .55s ease, transform .55s ease; }
    .reveal.is-visible { opacity: 1; transform: translateY(0); }

    @media (max-width: 1040px) {
      .header-inner { gap: 14px; }
      .nav-links a { padding-inline: 6px; font-size: 12px; }
      .header-cta { padding-inline: 12px; font-size: 13px; }
      .services-grid { grid-template-columns: repeat(3,1fr); }
    }
    @media (max-width: 820px) {
      .menu-toggle { display: block; margin-left: auto; }
      .header-cta { display: none; }
      .header-inner { position: relative; }
      .nav-links { display: none; position: absolute; top: calc(100% - 1px); left: 0; right: 0; align-items: stretch; padding: 10px; border: 1px solid var(--line); background: #fff; box-shadow: 0 14px 25px rgba(29,58,31,.1); }
      .nav-links.open { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); }
      .nav-links a { padding: 10px; font-size: 14px; }
      .hero { padding-top: 56px; }
      .hero-inner { grid-template-columns: 1fr; gap: 30px; }
      .hero-console { max-width: 540px; }
      .intro-layout, .network-band, .comparison-layout, .contact-layout { grid-template-columns: 1fr; gap: 30px; }
      .intro-aside { max-width: 650px; }
      .services-grid { grid-template-columns: repeat(2,1fr); }
      .workflow { grid-template-columns: repeat(2,1fr); }
      .solution-strip { grid-template-columns: repeat(2,1fr); }
      .review-grid { grid-template-columns: repeat(2,1fr); }
      .metrics-grid { grid-template-columns: repeat(2,1fr); }
      .footer-top { grid-template-columns: 1fr; }
    }
    @media (max-width: 560px) {
      .container { width: min(var(--container), calc(100% - 30px)); }
      .header-inner { min-height: 64px; }
      .brand img { width: 122px; }
      .hero { padding: 44px 0 34px; }
      h1 { font-size: 39px; }
      .hero-copy { font-size: 15px; }
      .hero-console { padding: 18px; box-shadow: 8px 8px 0 #d6e8c8; }
      .section { padding: 54px 0; }
      .section-head { display: block; margin-bottom: 24px; }
      .services-grid, .case-grid, .review-grid, .solution-strip, .article-grid { grid-template-columns: 1fr; }
      .service-item { min-height: auto; }
      .service-number { margin-bottom: 12px; }
      .workflow { grid-template-columns: 1fr 1fr; gap: 12px; }
      .step { padding-right: 8px; }
      .metrics-grid { gap: 14px 8px; }
      .metric { padding-left: 12px; }
      .metric strong { font-size: 18px; }
      .join-inner { align-items: flex-start; flex-direction: column; }
      .contact-form { grid-template-columns: 1fr; }
      .field.full, .form-footnote { grid-column: auto; }
      .footer-bottom { flex-direction: column; }
      .floating-help { right: 10px; bottom: 12px; }
      .floating-help a { min-height: 42px; }
    }
    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
      .reveal { opacity: 1; transform: none; }
    }