:root {
      color-scheme: light;
      --ink: #202329;
      --muted: #626973;
      --paper: #f8f8f6;
      --white: #fff;
      --line: #e5e5e1;
      --coral: #ed4b3d;
      --pink: #fa7892;
      --lime: #c8ed58;
      --blue: #3865d8;
      --green: #337857;
      --container: 1160px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; scroll-padding-top: 84px; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
      line-height: 1.65;
    }
    a { color: inherit; text-decoration: none; }
    button, input, select, textarea { font: inherit; }
    button, a { -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(248,248,246,.94);
      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: 10px; flex: 0 0 auto; font-weight: 800; }
    .ai-page-logo { display: block; width: 38px; max-width: 100%; height: auto; }
    .brand-name { font-size: 17px; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; gap: 0; }
    .nav-links a { padding: 9px 10px; color: #4e535c; font-size: 13px; white-space: nowrap; transition: color .2s ease; }
    .nav-links a:hover { color: var(--coral); }
    .nav-cta, .button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 46px; padding: 0 19px; border: 0; border-radius: 5px; background: var(--coral); color: #fff; font-weight: 700; transition: transform .2s ease, background .2s ease, box-shadow .2s ease; }
    .nav-cta { flex: 0 0 auto; min-height: 40px; padding-inline: 14px; font-size: 13px; }
    .button:hover, .nav-cta:hover { background: #d83c31; box-shadow: 0 8px 20px rgba(221,65,54,.18); transform: translateY(-2px); }
    .button-light { background: var(--white); color: var(--ink); border: 1px solid var(--line); }
    .button-light:hover { background: #f2f2ef; }
    .menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 5px; background: var(--white); color: var(--ink); }
    .hero { position: relative; overflow: hidden; padding: 78px 0 46px; background: var(--lime); }
    .hero::after { content: ""; position: absolute; right: 7%; top: 43px; width: 180px; aspect-ratio: 1; border: 1px solid rgba(32,35,41,.19); border-radius: 50%; box-shadow: 0 0 0 28px rgba(255,255,255,.14), 0 0 0 58px rgba(255,255,255,.12); pointer-events: none; }
    .hero-inner { position: relative; z-index: 1; max-width: 820px; }
    .eyebrow { margin: 0 0 15px; color: #46521e; font-size: 12px; font-weight: 800; letter-spacing: 1.4px; text-transform: uppercase; }
    h1 { max-width: 750px; margin: 0; font-size: clamp(38px, 7vw, 76px); line-height: 1.08; letter-spacing: 0; }
    .hero-copy { max-width: 690px; margin: 22px 0 26px; color: #384021; font-size: 17px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
    .hero .button { background: var(--ink); color: #fff; }
    .hero .button:hover { background: #383c44; }
    .hero .button-light { background: rgba(255,255,255,.72); border-color: rgba(32,35,41,.18); color: var(--ink); }
    .hero-foot { display: flex; flex-wrap: wrap; gap: 10px 23px; margin-top: 37px; color: #46521e; font-size: 13px; }
    .hero-foot span::before { content: "✳"; margin-right: 8px; }
    .section { padding: 68px 0; }
    .section-tint { background: #f0f0ec; }
    .section-dark { background: #22272c; color: #fff; }
    .section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 27px; }
    .section-head > div { max-width: 720px; }
    .section-label { margin: 0 0 9px; color: var(--coral); font-size: 12px; font-weight: 800; letter-spacing: 1.2px; }
    h2 { margin: 0; font-size: clamp(27px, 4vw, 39px); line-height: 1.2; letter-spacing: 0; }
    .section-intro { max-width: 700px; margin: 12px 0 0; color: var(--muted); }
    .section-dark .section-label { color: #ff8580; }
    .section-dark .section-intro { color: #d2d5d7; }
    .metrics { display: grid; grid-template-columns: repeat(4, 1fr); border-block: 1px solid var(--line); }
    .metric { padding: 23px 20px; border-right: 1px solid var(--line); }
    .metric:last-child { border-right: 0; }
    .metric strong { display: block; font-size: 24px; line-height: 1.3; }
    .metric span { display: block; margin-top: 5px; color: var(--muted); font-size: 13px; }
    .about-layout { display: grid; grid-template-columns: .85fr 1.15fr; gap: 48px; align-items: start; }
    .about-note { border-left: 4px solid var(--coral); padding: 8px 0 8px 20px; color: #3d4249; font-size: 18px; }
    .about-copy p { margin: 0 0 14px; color: var(--muted); }
    .platform-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 19px; }
    .platform-tags span { padding: 6px 10px; border: 1px solid #d8d9d4; border-radius: 3px; background: var(--white); color: #444951; font-size: 12px; }
    .service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); }
    .service-item { min-height: 166px; padding: 22px; background: var(--paper); transition: background .2s ease; }
    .service-item:hover { background: #fff3ed; }
    .service-item .index { display: block; margin-bottom: 17px; color: var(--coral); font-size: 12px; font-weight: 800; }
    .service-item h3 { margin: 0 0 8px; font-size: 18px; }
    .service-item p { margin: 0; color: var(--muted); font-size: 14px; }
    .workflow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; counter-reset: flow; }
    .flow-step { position: relative; padding-top: 18px; border-top: 2px solid var(--coral); counter-increment: flow; }
    .flow-step::before { content: "0" counter(flow); display: block; margin-bottom: 17px; color: var(--coral); font-size: 13px; font-weight: 800; }
    .flow-step h3 { margin: 0 0 7px; font-size: 17px; }
    .flow-step p { margin: 0; color: var(--muted); font-size: 14px; }
    .industry-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 25px; }
    .industry { padding-top: 16px; border-top: 1px solid #555b62; }
    .industry h3 { margin: 0 0 8px; color: #fff; font-size: 18px; }
    .industry p { margin: 0; color: #c9cdd0; font-size: 14px; }
    .split-band { display: grid; grid-template-columns: 1fr 1fr; gap: 42px; align-items: center; }
    .quote-mark { margin: 0; color: var(--coral); font-size: 66px; line-height: .8; }
    .network-list { display: flex; flex-wrap: wrap; gap: 9px; }
    .network-list span { padding: 8px 12px; border: 1px solid var(--line); background: var(--white); color: #444951; font-size: 13px; }
    .case-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
    .case { display: grid; grid-template-columns: .88fr 1.12fr; gap: 20px; align-items: center; }
    .media-frame { overflow: hidden; background: #e7e7e2; }
    .media-frame img { display: block; width: 100%; height: auto; aspect-ratio: 4 / 3; object-fit: cover; }
    .case h3 { margin: 0 0 8px; font-size: 18px; }
    .case p { margin: 0; color: var(--muted); font-size: 14px; }
    .evaluation { display: grid; grid-template-columns: .72fr 1.28fr; gap: 35px; align-items: start; }
    .score-box { padding: 25px; background: var(--coral); color: #fff; }
    .score-box .score { font-size: 52px; font-weight: 800; line-height: 1; }
    .score-box p { margin: 10px 0 0; }
    .stars { margin-top: 17px; color: #ffe16f; font-size: 22px; letter-spacing: 2px; }
    .table-wrap { overflow-x: auto; border: 1px solid var(--line); background: var(--white); }
    table { width: 100%; border-collapse: collapse; min-width: 610px; text-align: left; }
    th, td { padding: 14px 16px; border-bottom: 1px solid var(--line); font-size: 14px; }
    th { background: #f0f0ec; font-weight: 750; }
    tbody tr:last-child td { border-bottom: 0; }
    td:first-child { font-weight: 650; }
    .match-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 38px; align-items: start; }
    .match-points { padding: 0; margin: 18px 0 0; list-style: none; }
    .match-points li { padding: 10px 0; border-bottom: 1px solid var(--line); color: var(--muted); }
    .match-points li::before { content: "✓"; margin-right: 11px; color: var(--green); font-weight: 800; }
    .form-box { padding: 25px; border: 1px solid var(--line); background: var(--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 { font-size: 13px; font-weight: 700; }
    .field input, .field select, .field textarea { width: 100%; min-height: 44px; padding: 10px 11px; border: 1px solid #d8d9d4; border-radius: 3px; background: #fff; color: var(--ink); }
    .field textarea { min-height: 110px; resize: vertical; }
    .form-box .button { margin-top: 16px; cursor: pointer; }
    .reviews { display: grid; grid-template-columns: repeat(3, 1fr); gap: 17px; }
    .review { padding: 19px; border-top: 3px solid var(--pink); background: #fff; }
    .review p { margin: 0 0 14px; color: #464b52; font-size: 14px; }
    .review strong { font-size: 13px; }
    .review span { display: block; color: var(--muted); font-size: 12px; }
    .faq-list { border-top: 1px solid var(--line); }
    .faq-item { border-bottom: 1px solid var(--line); }
    .faq-item summary { display: flex; justify-content: space-between; gap: 18px; padding: 17px 0; cursor: pointer; font-weight: 700; list-style: none; }
    .faq-item summary::-webkit-details-marker { display: none; }
    .faq-item summary::after { content: "+"; color: var(--coral); font-size: 20px; line-height: 1; }
    .faq-item[open] summary::after { content: "−"; }
    .faq-item p { max-width: 820px; margin: 0 0 17px; color: var(--muted); font-size: 14px; }
    .resource-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 34px; }
    .resource-list { padding: 0; margin: 0; list-style: none; }
    .resource-list li { padding: 12px 0; border-bottom: 1px solid var(--line); }
    .resource-list a:hover { color: var(--coral); }
    .resource-list small { display: block; color: var(--muted); }
    .article-shortcode { margin-top: 13px; padding: 15px; border-left: 3px solid var(--coral); background: #fff; color: #454a51; overflow-wrap: anywhere; }
    .contact-bar { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 25px 0; border-top: 1px solid var(--line); }
    .contact-details { display: flex; flex-wrap: wrap; gap: 8px 20px; color: var(--muted); font-size: 14px; }
    .contact-details a { color: var(--ink); }
    .site-footer { background: #e9e9e4; color: #292d32; }
    .footer-main { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; padding: 28px 0; }
    .footer-main p { margin: 8px 0 0; color: #565c62; font-size: 13px; }
    .footer-links { display: flex; flex-wrap: wrap; align-content: start; gap: 9px 18px; font-size: 13px; }
    .footer-links a:hover { color: var(--coral); }
    .copyright { padding: 12px 0 17px; border-top: 1px solid #d4d5cf; color: #565c62; font-size: 12px; }
    .float-contact { position: fixed; z-index: 15; right: 18px; bottom: 20px; display: grid; gap: 8px; }
    .float-contact a { display: inline-flex; align-items: center; justify-content: center; min-width: 48px; min-height: 46px; padding: 0 12px; border: 1px solid var(--line); border-radius: 4px; background: #fff; color: var(--ink); box-shadow: 0 5px 17px rgba(0,0,0,.1); font-size: 13px; font-weight: 700; }
    .float-contact a:first-child { background: var(--coral); color: #fff; border-color: var(--coral); }
    .reveal { opacity: 0; transform: translateY(14px); transition: opacity .55s ease, transform .55s ease; }
    .reveal.is-visible { opacity: 1; transform: translateY(0); }
    @media (max-width: 1050px) {
      .nav-links a { padding-inline: 7px; font-size: 12px; }
      .nav-cta { display: none; }
    }
    @media (max-width: 760px) {
      .container { width: min(var(--container), calc(100% - 32px)); }
      .header-row { min-height: 64px; }
      .menu-toggle { display: inline-grid; place-items: center; }
      .nav-links { display: none; position: absolute; top: 64px; left: 0; right: 0; padding: 10px 16px 15px; border-bottom: 1px solid var(--line); background: var(--paper); align-items: stretch; flex-direction: column; }
      .nav-links.is-open { display: flex; }
      .nav-links a { padding: 10px 4px; font-size: 14px; border-bottom: 1px solid var(--line); }
      .nav-links a:last-child { border-bottom: 0; }
      .hero { padding: 59px 0 35px; }
      .hero::after { right: -55px; top: 24px; width: 130px; }
      .hero-copy { font-size: 16px; }
      .section { padding: 52px 0; }
      .section-head { align-items: start; flex-direction: column; }
      .metrics { grid-template-columns: 1fr 1fr; }
      .metric:nth-child(2) { border-right: 0; }
      .metric:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
      .about-layout, .split-band, .evaluation, .match-layout { grid-template-columns: 1fr; gap: 23px; }
      .service-grid { grid-template-columns: 1fr 1fr; }
      .workflow { grid-template-columns: 1fr 1fr; row-gap: 25px; }
      .industry-grid { grid-template-columns: 1fr 1fr; }
      .case-grid { grid-template-columns: 1fr; }
      .reviews { grid-template-columns: 1fr 1fr; }
      .resource-grid { grid-template-columns: 1fr; }
      .footer-main { grid-template-columns: 1fr; gap: 18px; }
    }
    @media (max-width: 480px) {
      .hero-actions .button { width: 100%; }
      .service-grid, .industry-grid, .reviews { grid-template-columns: 1fr; }
      .service-item { min-height: 0; }
      .case { grid-template-columns: 1fr; }
      .form-box { padding: 17px; }
      .form-grid { grid-template-columns: 1fr; }
      .field-wide { grid-column: auto; }
      .contact-bar { align-items: start; flex-direction: column; }
      .float-contact { right: 10px; bottom: 10px; }
      .float-contact a { min-height: 42px; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
      .reveal { opacity: 1; transform: none; }
    }