:root {
      color-scheme: light;
      --ink: #20231f;
      --muted: #62665f;
      --paper: #fbfaf5;
      --white: #fff;
      --yellow: #f6c900;
      --yellow-deep: #e9b900;
      --green: #234d3a;
      --line: #e6e3d8;
      --container: 1160px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    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; text-decoration: none; }
    button, input, select, textarea { font: inherit; }
    img { max-width: 100%; height: auto; }
    .container { width: min(var(--container), calc(100% - 40px)); margin-inline: auto; }
    .site-header { position: sticky; z-index: 20; top: 0; background: rgba(251,250,245,.96); border-bottom: 1px solid rgba(32,35,31,.09); backdrop-filter: blur(12px); }
    .nav-row { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 22px; }
    .brand { display: inline-flex; align-items: center; gap: 10px; flex: 0 0 auto; }
    .brand img { width: 42px; height: 42px; object-fit: contain; }
    .brand-name { font-size: 18px; font-weight: 800; letter-spacing: 0; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; gap: 0; flex-wrap: wrap; }
    .nav-links a { padding: 10px 9px; color: #44483f; font-size: 13px; white-space: nowrap; transition: color .2s ease; }
    .nav-links a:hover { color: #9b7600; }
    .nav-actions { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; }
    .menu-toggle { display: none; border: 1px solid var(--line); background: var(--white); color: var(--ink); padding: 9px 12px; cursor: pointer; }
    .button { display: inline-flex; min-height: 46px; align-items: center; justify-content: center; gap: 8px; border: 1px solid var(--ink); padding: 11px 18px; background: var(--ink); color: var(--white); font-weight: 700; cursor: pointer; transition: transform .2s ease, box-shadow .2s ease, background .2s ease; }
    .button:hover { transform: translateY(-2px); box-shadow: 0 8px 18px rgba(32,35,31,.15); }
    .button-yellow { border-color: var(--yellow); background: var(--yellow); color: var(--ink); }
    .button-outline { background: transparent; color: var(--ink); }
    .hero { position: relative; overflow: hidden; padding: 72px 0 54px; background: var(--yellow); }
    .hero::before { position: absolute; inset: auto -8% -190px auto; width: 520px; aspect-ratio: 1; border: 1px solid rgba(32,35,31,.18); border-radius: 50%; content: ""; }
    .hero::after { position: absolute; inset: auto -1% -280px auto; width: 650px; aspect-ratio: 1; border: 1px solid rgba(32,35,31,.14); border-radius: 50%; content: ""; }
    .hero-inner { position: relative; z-index: 1; display: grid; grid-template-columns: minmax(0,1.15fr) minmax(280px,.85fr); align-items: center; gap: 56px; }
    .eyebrow { margin: 0 0 14px; color: #534400; font-size: 13px; font-weight: 800; letter-spacing: 0; }
    h1 { max-width: 700px; margin: 0; font-size: clamp(38px, 6vw, 68px); line-height: 1.08; letter-spacing: 0; }
    .hero-copy { max-width: 650px; margin: 22px 0 26px; color: #393517; font-size: 17px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
    .hero-side { padding: 27px; border: 1px solid rgba(32,35,31,.22); background: rgba(255,255,255,.42); }
    .hero-side h2 { margin: 0 0 17px; font-size: 17px; }
    .model-tags { display: flex; flex-wrap: wrap; gap: 8px; }
    .model-tags span { padding: 7px 10px; border: 1px solid rgba(32,35,31,.18); background: rgba(255,255,255,.65); font-size: 12px; font-weight: 700; }
    .hero-note { margin: 18px 0 0; color: #4d4315; font-size: 13px; }
    .metrics { padding: 20px 0; background: var(--green); color: var(--white); }
    .metric-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 16px; }
    .metric { padding: 8px 15px; border-left: 1px solid rgba(255,255,255,.3); }
    .metric strong { display: block; color: var(--yellow); font-size: 20px; }
    .metric span { color: #e4eee5; font-size: 13px; }
    section.content-section { padding: 72px 0; }
    .section-heading { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 30px; }
    .section-heading h2 { margin: 0; font-size: clamp(27px, 4vw, 40px); line-height: 1.2; letter-spacing: 0; }
    .section-heading p { max-width: 560px; margin: 0; color: var(--muted); }
    .section-kicker { display: block; margin-bottom: 10px; color: #8b6c00; font-size: 12px; font-weight: 800; }
    .intro-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
    .intro-copy p { margin: 0 0 16px; color: var(--muted); }
    .intro-points { display: grid; grid-template-columns: repeat(2,1fr); gap: 0 22px; border-top: 1px solid var(--line); }
    .intro-point { padding: 15px 0; border-bottom: 1px solid var(--line); }
    .intro-point strong { display: block; margin-bottom: 3px; }
    .intro-point span { color: var(--muted); font-size: 13px; }
    .service-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 0 24px; border-top: 1px solid var(--line); }
    .service-item { padding: 22px 0 24px; border-bottom: 1px solid var(--line); }
    .service-item .index { color: #8b6c00; font-size: 12px; font-weight: 800; }
    .service-item h3 { margin: 7px 0 6px; font-size: 18px; }
    .service-item p { margin: 0; color: var(--muted); font-size: 14px; }
    .service-footer { margin-top: 24px; }
    .workflow { background: #f0eee4; }
    .steps { display: grid; grid-template-columns: repeat(4,1fr); gap: 0; border-top: 1px solid #d3d0c4; border-bottom: 1px solid #d3d0c4; }
    .step { padding: 23px 22px 23px 0; }
    .step + .step { padding-left: 22px; border-left: 1px solid #d3d0c4; }
    .step b { color: #8b6c00; font-size: 13px; }
    .step h3 { margin: 9px 0 5px; font-size: 17px; }
    .step p { margin: 0; color: var(--muted); font-size: 13px; }
    .solution-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; }
    .solution { padding: 20px; border: 1px solid var(--line); background: var(--white); transition: transform .2s ease, box-shadow .2s ease; }
    .solution:hover { transform: translateY(-3px); box-shadow: 0 12px 24px rgba(32,35,31,.08); }
    .solution h3 { margin: 0 0 8px; font-size: 17px; }
    .solution p { margin: 0; color: var(--muted); font-size: 14px; }
    .network-band { padding: 30px; background: var(--green); color: var(--white); }
    .network-band h3 { margin: 0 0 14px; color: var(--yellow); }
    .network-band p { margin: 0; color: #e0e9e0; line-height: 2; }
    .timeline { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; }
    .timeline-item { padding-top: 16px; border-top: 3px solid var(--yellow-deep); }
    .timeline-item h3 { margin: 0 0 7px; font-size: 18px; }
    .timeline-item p { margin: 0; color: var(--muted); font-size: 14px; }
    .case-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: start; }
    .case-feature { padding: 26px; background: #f0eee4; }
    .case-feature h3 { margin: 0 0 8px; font-size: 22px; }
    .case-feature p { margin: 0 0 18px; color: var(--muted); }
    .image-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
    .image-frame { padding: 7px; border: 1px solid var(--line); background: var(--white); }
    .image-frame img { display: block; width: 100%; aspect-ratio: 16 / 10; object-fit: contain; background: #f7f6f0; }
    .case-square { max-width: 280px; }
    .case-square img { aspect-ratio: 1; }
    .review-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; }
    .review { padding: 18px; border-top: 2px solid var(--yellow-deep); background: var(--white); }
    .review blockquote { margin: 0 0 14px; color: #44483f; font-size: 14px; }
    .review cite { color: var(--muted); font-size: 12px; font-style: normal; font-weight: 700; }
    .score-line { display: flex; align-items: center; gap: 22px; margin-bottom: 24px; padding: 20px 0; border-bottom: 1px solid var(--line); }
    .score { font-size: 54px; font-weight: 850; line-height: 1; }
    .score small { font-size: 17px; font-weight: 600; }
    .stars { color: #b68d00; font-size: 20px; letter-spacing: 0; }
    .comparison-wrap { overflow-x: auto; border: 1px solid var(--line); background: var(--white); }
    .comparison { width: 100%; min-width: 700px; border-collapse: collapse; text-align: left; }
    .comparison th, .comparison td { padding: 13px 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
    .comparison th { background: #f2f0e7; font-size: 13px; }
    .comparison td { color: #4b4f47; font-size: 14px; }
    .comparison td:first-child { color: var(--ink); font-weight: 700; }
    .comparison tr:last-child td { border-bottom: 0; }
    .demand-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 42px; align-items: start; }
    .demand-copy p { color: var(--muted); }
    .form-grid { 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%; min-width: 0; border: 1px solid #d8d5ca; border-radius: 0; padding: 12px; background: var(--white); color: var(--ink); }
    .field textarea { min-height: 116px; resize: vertical; }
    .form-note { margin: 10px 0 0; color: var(--muted); font-size: 12px; }
    .price-table { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: center; }
    .price-table p { margin: 0; color: var(--muted); }
    .price-points { display: grid; grid-template-columns: repeat(2,1fr); gap: 10px 20px; }
    .price-points span { padding: 10px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
    .faq-list { border-top: 1px solid var(--line); }
    details { border-bottom: 1px solid var(--line); }
    summary { position: relative; padding: 17px 36px 17px 0; cursor: pointer; font-weight: 700; list-style: none; }
    summary::-webkit-details-marker { display: none; }
    summary::after { position: absolute; right: 4px; content: "+"; font-size: 20px; 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; }
    .article-list { display: grid; grid-template-columns: repeat(5,1fr); gap: 12px; }
    .article-list a { padding: 15px; border: 1px solid var(--line); background: var(--white); font-size: 14px; font-weight: 700; transition: border-color .2s ease, transform .2s ease; }
    .article-list a:hover { transform: translateY(-2px); border-color: var(--yellow-deep); }
    .article-list span { display: block; margin-top: 7px; color: var(--muted); font-size: 12px; font-weight: 400; }
    .join-band { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 27px; background: var(--yellow); }
    .join-band h2 { margin: 0 0 5px; font-size: 24px; }
    .join-band p { margin: 0; color: #494014; }
    .contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: start; }
    .contact-details { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 20px; }
    .contact-details div { padding: 12px 0; border-bottom: 1px solid var(--line); }
    .contact-details strong { display: block; font-size: 13px; }
    .contact-details span, .contact-details a { color: var(--muted); font-size: 14px; overflow-wrap: anywhere; }
    .qr { width: 150px; padding: 7px; border: 1px solid var(--line); background: var(--white); }
    .qr img { display: block; width: 100%; aspect-ratio: 1; object-fit: contain; }
    .site-footer { margin-top: 0; padding: 30px 0 22px; background: #e9e7dd; color: #252820; }
    .footer-top { display: flex; justify-content: space-between; gap: 24px; align-items: start; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 8px 18px; max-width: 720px; }
    .footer-links a { color: #3d4238; font-size: 13px; }
    .footer-links a:hover { text-decoration: underline; }
    .copyright { margin: 18px 0 0; padding-top: 14px; border-top: 1px solid #d3d0c5; color: #565a51; font-size: 12px; }
    .floating { position: fixed; z-index: 18; right: 18px; bottom: 20px; display: flex; flex-direction: column; gap: 8px; }
    .floating a, .top-button { display: inline-flex; align-items: center; justify-content: center; min-width: 46px; min-height: 42px; border: 1px solid var(--ink); padding: 8px 12px; background: var(--yellow); color: var(--ink); font-size: 12px; font-weight: 800; cursor: pointer; }
    .reveal { opacity: 0; transform: translateY(14px); transition: opacity .55s ease, transform .55s ease; }
    .reveal.is-visible { opacity: 1; transform: translateY(0); }
    @media (max-width: 980px) {
      .nav-row { flex-wrap: wrap; padding: 12px 0; }
      .nav-links { order: 3; width: 100%; justify-content: flex-start; }
      .nav-actions { margin-left: auto; }
      .hero-inner { gap: 28px; }
      .service-grid, .solution-grid { grid-template-columns: repeat(2,1fr); }
      .article-list { grid-template-columns: repeat(3,1fr); }
    }
    @media (max-width: 700px) {
      .container { width: min(var(--container), calc(100% - 32px)); }
      .nav-row { min-height: 68px; }
      .menu-toggle { display: inline-flex; }
      .nav-links { display: none; align-items: stretch; flex-direction: column; gap: 0; padding: 8px 0 2px; }
      .nav-links.is-open { display: flex; }
      .nav-links a { padding: 9px 2px; border-top: 1px solid var(--line); }
      .nav-actions .button { min-height: 40px; padding: 8px 12px; font-size: 13px; }
      .hero { padding: 52px 0 40px; }
      .hero-inner, .intro-grid, .case-layout, .demand-grid, .price-table, .contact-grid { grid-template-columns: 1fr; }
      .hero-inner { gap: 30px; }
      .hero-side { max-width: 520px; }
      .metric-grid { grid-template-columns: repeat(2,1fr); }
      .metric:nth-child(3) { border-top: 1px solid rgba(255,255,255,.3); padding-top: 14px; }
      .metric:nth-child(4) { border-top: 1px solid rgba(255,255,255,.3); padding-top: 14px; }
      section.content-section { padding: 54px 0; }
      .section-heading { display: block; }
      .section-heading p { margin-top: 12px; }
      .steps { grid-template-columns: 1fr 1fr; }
      .step { padding: 18px 12px 18px 0; }
      .step + .step { padding-left: 12px; }
      .step:nth-child(3) { border-top: 1px solid #d3d0c4; }
      .step:nth-child(4) { border-top: 1px solid #d3d0c4; }
      .review-grid { grid-template-columns: 1fr 1fr; }
      .article-list { grid-template-columns: 1fr 1fr; }
      .join-band, .footer-top { align-items: flex-start; flex-direction: column; }
      .floating { right: 10px; bottom: 10px; }
      .floating a, .top-button { min-width: 42px; min-height: 40px; padding: 6px 9px; }
    }
    @media (max-width: 460px) {
      .brand img { width: 36px; height: 36px; }
      .brand-name { font-size: 16px; }
      .nav-actions .button { display: none; }
      .hero-actions .button { width: 100%; }
      .service-grid, .solution-grid, .review-grid, .intro-points, .form-grid, .contact-details { grid-template-columns: 1fr; }
      .field.full { grid-column: auto; }
      .article-list { grid-template-columns: 1fr; }
      .score-line { align-items: flex-start; flex-direction: column; gap: 10px; }
    }
    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
      .reveal { opacity: 1; transform: none; }
    }