:root {
      --ink: #102b35;
      --muted: #60747a;
      --teal: #0aa89a;
      --teal-dark: #087d78;
      --mint: #dff8f1;
      --cyan: #dff5f7;
      --paper: #f7fbfa;
      --line: #dbe9e7;
      --white: #fff;
      --orange: #ef8b48;
      --shadow: 0 16px 45px rgba(20, 77, 76, .10);
      --radius: 14px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      font-family: Arial, "Microsoft YaHei", "PingFang SC", sans-serif;
      line-height: 1.7;
    }
    a { color: inherit; text-decoration: none; }
    img { max-width: 100%; height: auto; display: block; }
    .container { width: min(1180px, calc(100% - 36px)); margin: 0 auto; }
    .site-header {
      position: sticky; top: 0; z-index: 20;
      background: rgba(247,251,250,.94);
      border-bottom: 1px solid rgba(219,233,231,.9);
      backdrop-filter: blur(16px);
    }
    .nav {
      min-height: 76px; display: flex; align-items: center;
      justify-content: space-between; gap: 24px;
    }
    .brand { display: flex; align-items: center; gap: 11px; flex-shrink: 0; }
    .ai-page-logo { width: 42px; max-height: 42px; object-fit: contain; }
    .brand strong { font-size: 19px; letter-spacing: 0; }
    .brand small { display: block; color: var(--muted); font-size: 11px; line-height: 1.2; }
    .nav-links { display: flex; align-items: center; gap: 0; margin-left: auto; }
    .nav-links a { padding: 9px 10px; color: #38575c; font-size: 13px; white-space: nowrap; }
    .nav-links a:hover { color: var(--teal-dark); }
    .nav-cta, .button {
      display: inline-flex; align-items: center; justify-content: center; gap: 8px;
      border: 0; border-radius: 8px; padding: 12px 18px; cursor: pointer;
      font: inherit; font-weight: 700; transition: .25s ease;
    }
    .nav-cta, .button-primary { color: #fff; background: var(--teal-dark); box-shadow: 0 8px 18px rgba(8,125,120,.18); }
    .nav-cta:hover, .button-primary:hover { background: #05625f; transform: translateY(-2px); }
    .button-light { color: var(--teal-dark); background: #fff; border: 1px solid #bce8df; }
    .button-light:hover { background: var(--mint); }
    .menu-toggle { display: none; border: 1px solid var(--line); background: #fff; color: var(--ink); padding: 8px 10px; border-radius: 7px; font-size: 20px; }
    .hero {
      position: relative; overflow: hidden; padding: 92px 0 76px;
      background:
        linear-gradient(130deg, rgba(224,249,244,.98), rgba(242,252,251,.98) 54%, rgba(222,246,248,.96)),
        repeating-linear-gradient(90deg, transparent 0, transparent 79px, rgba(12,157,148,.05) 80px);
    }
    .hero:after {
      content: ""; position: absolute; width: 420px; height: 420px; right: -130px; top: -180px;
      border: 1px solid rgba(9,145,139,.16); border-radius: 50%;
      box-shadow: 0 0 0 26px rgba(9,145,139,.04), 0 0 0 54px rgba(9,145,139,.03);
    }
    .hero-grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(300px, .85fr); gap: 52px; align-items: center; position: relative; z-index: 1; }
    .eyebrow { display: inline-flex; align-items: center; gap: 8px; color: var(--teal-dark); font-weight: 700; font-size: 13px; letter-spacing: 1px; }
    .eyebrow:before { content: ""; width: 28px; height: 2px; background: var(--orange); }
    h1, h2, h3 { margin: 0 0 15px; line-height: 1.25; letter-spacing: 0; }
    h1 { font-size: clamp(34px, 5vw, 62px); max-width: 670px; }
    h2 { font-size: clamp(27px, 3.5vw, 42px); }
    h3 { font-size: 19px; }
    .hero p { max-width: 650px; color: #4d686d; font-size: 17px; margin: 0 0 27px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
    .hero-panel { padding: 26px; background: rgba(255,255,255,.76); border: 1px solid rgba(255,255,255,.95); border-radius: 18px; box-shadow: var(--shadow); }
    .hero-panel strong { display: block; font-size: 18px; margin-bottom: 17px; }
    .signal-list { display: grid; gap: 12px; }
    .signal { display: flex; align-items: center; gap: 12px; padding: 13px; background: #f8fffd; border: 1px solid #d7efea; border-radius: 9px; }
    .signal i { width: 10px; height: 10px; border-radius: 50%; background: var(--teal); box-shadow: 0 0 0 5px #d8f4ed; flex-shrink: 0; }
    .signal span { font-size: 14px; color: #45646a; }
    .section { padding: 82px 0; }
    .section-tint { background: linear-gradient(180deg, #eefaf7, #f7fbfa); }
    .section-head { max-width: 730px; margin-bottom: 34px; }
    .section-head p { color: var(--muted); margin: 0; }
    .section-head.center { margin-left: auto; margin-right: auto; text-align: center; }
    .kicker { color: var(--teal-dark); font-weight: 800; font-size: 12px; text-transform: uppercase; letter-spacing: 1.5px; margin-bottom: 9px; }
    .metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: -25px; position: relative; z-index: 2; }
    .metric { background: #fff; border: 1px solid var(--line); padding: 23px; border-radius: 10px; box-shadow: 0 8px 22px rgba(20,77,76,.06); }
    .metric b { font-size: 30px; color: var(--teal-dark); display: block; }
    .metric span { color: var(--muted); font-size: 13px; }
    .intro-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
    .intro-copy p { color: var(--muted); }
    .feature-list { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 22px; }
    .feature-list div { padding: 15px; background: #fff; border-left: 3px solid var(--teal); border-radius: 5px; box-shadow: 0 7px 19px rgba(20,77,76,.06); }
    .feature-list b { display: block; font-size: 15px; }
    .feature-list span { font-size: 13px; color: var(--muted); }
    .service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .service-card { padding: 24px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); transition: .25s ease; }
    .service-card:hover, .review:hover, .case:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: #a8ddd4; }
    .service-icon { width: 42px; height: 42px; display: grid; place-items: center; background: var(--mint); color: var(--teal-dark); border-radius: 10px; font-weight: 800; margin-bottom: 18px; }
    .service-card p, .case p, .review p { color: var(--muted); font-size: 14px; margin: 0; }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 25px; }
    .tag { padding: 8px 13px; color: #37636a; background: #e4f6f3; border: 1px solid #cbeae4; border-radius: 4px; font-size: 13px; }
    .process { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; counter-reset: process; }
    .process-step { position: relative; padding: 18px 20px 10px 0; }
    .process-step:not(:last-child):after { content: ""; position: absolute; top: 34px; right: 12px; width: calc(100% - 74px); height: 1px; background: #9bd9d0; transform: translateX(100%); }
    .process-number { width: 40px; height: 40px; display: grid; place-items: center; background: var(--teal-dark); color: #fff; border-radius: 50%; font-weight: 800; margin-bottom: 17px; }
    .process-step h3 { font-size: 16px; }
    .process-step p { margin: 0; color: var(--muted); font-size: 13px; }
    .solutions { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
    .solution { padding: 20px; background: #fff; border-top: 3px solid var(--teal); border-radius: 8px; }
    .solution h3 { font-size: 17px; }
    .solution p { margin: 0; color: var(--muted); font-size: 13px; }
    .network { display: grid; grid-template-columns: 1.2fr .8fr; gap: 22px; align-items: stretch; }
    .network-box { padding: 28px; background: #fff; border: 1px solid var(--line); border-radius: 13px; }
    .network-box p { color: var(--muted); }
    .network-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
    .network-stat { padding: 20px; background: var(--cyan); border-radius: 8px; }
    .network-stat b { font-size: 25px; display: block; color: var(--teal-dark); }
    .network-stat span { font-size: 13px; color: #557178; }
    .case-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
    .case { display: grid; grid-template-columns: minmax(160px, .8fr) 1.2fr; gap: 18px; padding: 15px; background: #fff; border: 1px solid var(--line); border-radius: 13px; transition: .25s ease; }
    .image-box { overflow: hidden; border-radius: 9px; background: #e8f4f2; min-height: 150px; }
    .image-box img { width: 100%; height: 100%; object-fit: cover; }
    .case h3 { font-size: 18px; margin-top: 9px; }
    .case .tag { display: inline-block; padding: 4px 8px; font-size: 11px; }
    .comparison-wrap { overflow-x: auto; background: #fff; border: 1px solid var(--line); border-radius: 13px; }
    table { width: 100%; min-width: 760px; border-collapse: collapse; }
    th, td { padding: 17px 18px; text-align: left; border-bottom: 1px solid var(--line); font-size: 14px; }
    th { color: #fff; background: var(--teal-dark); font-size: 14px; }
    tr:last-child td { border-bottom: 0; }
    td:first-child { font-weight: 700; color: #34555b; }
    .score-box { display: flex; align-items: center; gap: 28px; padding: 23px; margin-bottom: 18px; background: #e5f8f2; border-radius: 12px; }
    .score { color: var(--teal-dark); font-size: 42px; font-weight: 800; line-height: 1; }
    .stars { color: #e38b32; letter-spacing: 3px; font-size: 22px; }
    .score-box p { margin: 3px 0 0; color: var(--muted); font-size: 13px; }
    .price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .price { padding: 25px; border: 1px solid var(--line); background: #fff; border-radius: 12px; }
    .price.featured { border: 2px solid var(--teal); background: #effbf8; }
    .price b { font-size: 21px; }
    .price strong { display: block; color: var(--teal-dark); font-size: 27px; margin: 14px 0 5px; }
    .price p { color: var(--muted); font-size: 13px; margin: 0; }
    .timeline { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
    .timeline-item { padding: 20px; border-bottom: 3px solid var(--teal); background: #fff; border-radius: 8px; }
    .timeline-item b { color: var(--orange); font-size: 13px; }
    .timeline-item p { color: var(--muted); font-size: 13px; margin: 8px 0 0; }
    .reviews { display: grid; grid-template-columns: repeat(3, 1fr); gap: 15px; }
    .review { padding: 22px; background: #fff; border: 1px solid var(--line); border-radius: 11px; transition: .25s ease; }
    .review p { margin-bottom: 17px; }
    .review strong { font-size: 14px; }
    .review span { display: block; color: var(--teal-dark); font-size: 12px; margin-top: 3px; }
    .faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 18px; align-items: start; }
    details { background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 17px 19px; }
    details[open] { border-color: #9edbd2; }
    summary { cursor: pointer; font-weight: 700; padding-right: 20px; list-style: none; position: relative; }
    summary::-webkit-details-marker { display: none; }
    summary:after { content: "+"; position: absolute; right: 0; color: var(--teal-dark); font-size: 20px; line-height: 1; }
    details[open] summary:after { content: "−"; }
    details p { color: var(--muted); font-size: 14px; margin: 12px 0 0; }
    .articles { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
    .article { padding: 19px; background: #fff; border: 1px solid var(--line); border-radius: 9px; }
    .article b { display: block; font-size: 14px; margin-bottom: 8px; }
    .article span { color: var(--teal-dark); font-size: 12px; }
    .contact-grid { display: grid; grid-template-columns: .85fr 1.15fr; gap: 26px; align-items: start; }
    .contact-panel { padding: 29px; background: #dff6f1; border-radius: 14px; }
    .contact-panel p { color: #4c6b70; }
    .contact-items { display: grid; gap: 13px; margin-top: 24px; }
    .contact-item { padding: 13px 15px; background: rgba(255,255,255,.67); border-radius: 7px; }
    .contact-item b { display: block; font-size: 13px; }
    .contact-item span { color: #4d6d72; font-size: 14px; }
    .qr { width: 110px; margin-top: 16px; border-radius: 8px; }
    form { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; padding: 28px; background: #fff; border: 1px solid var(--line); border-radius: 14px; }
    label { display: grid; gap: 6px; color: #36585e; font-size: 13px; font-weight: 700; }
    input, select, textarea { width: 100%; border: 1px solid #cfe2df; border-radius: 7px; padding: 12px 13px; font: inherit; color: var(--ink); background: #fbfefd; outline: none; }
    input:focus, select:focus, textarea:focus { border-color: var(--teal); box-shadow: 0 0 0 3px rgba(10,168,154,.11); }
    textarea { min-height: 125px; resize: vertical; }
    .full { grid-column: 1 / -1; }
    .join-band { padding: 28px 0; background: var(--teal-dark); color: #fff; }
    .join { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
    .join h2 { font-size: 27px; margin-bottom: 7px; }
    .join p { margin: 0; color: #d3f4ee; }
    .join .button-light { border: 0; }
    .footer { padding: 44px 0 23px; color: #d6eeeb; background: #103a43; }
    .footer-grid { display: grid; grid-template-columns: 1.2fr .8fr .8fr 1fr; gap: 28px; }
    .footer h3 { color: #fff; font-size: 16px; }
    .footer p, .footer a { color: #b6d2d0; font-size: 13px; }
    .footer a { display: block; margin: 7px 0; }
    .footer a:hover { color: #fff; }
    .footer-bottom { display: flex; justify-content: space-between; gap: 15px; padding-top: 24px; margin-top: 25px; border-top: 1px solid rgba(214,238,235,.18); color: #9ebfbd; font-size: 12px; }
    .floating { position: fixed; right: 18px; bottom: 18px; z-index: 12; display: grid; gap: 8px; }
    .float-button { width: 45px; height: 45px; display: grid; place-items: center; border-radius: 50%; color: #fff; background: var(--teal-dark); box-shadow: 0 8px 18px rgba(8,125,120,.24); font-weight: 800; }
    .float-button:hover { transform: translateY(-2px); }
    .reveal { opacity: 0; transform: translateY(18px); transition: opacity .65s ease, transform .65s ease; }
    .reveal.show { opacity: 1; transform: none; }
    @media (max-width: 1020px) {
      .nav-links a { padding: 9px 6px; font-size: 12px; }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .solutions { grid-template-columns: repeat(2, 1fr); }
      .articles { grid-template-columns: repeat(3, 1fr); }
    }
    @media (max-width: 760px) {
      .container { width: min(100% - 28px, 600px); }
      .nav { min-height: 68px; }
      .menu-toggle { display: block; }
      .nav-links { display: none; position: absolute; top: 68px; left: 14px; right: 14px; padding: 10px; background: #fff; border: 1px solid var(--line); border-radius: 9px; box-shadow: var(--shadow); }
      .nav-links.open { display: grid; }
      .nav-links a { padding: 11px 12px; border-bottom: 1px solid #edf4f2; }
      .nav-links a:last-child { border: 0; }
      .nav-cta { display: none; }
      .hero { padding: 65px 0 60px; }
      .hero-grid, .intro-grid, .network, .contact-grid { grid-template-columns: 1fr; gap: 28px; }
      .metrics { grid-template-columns: repeat(2, 1fr); margin-top: -15px; }
      .metric { padding: 18px; }
      .metric b { font-size: 25px; }
      .section { padding: 60px 0; }
      .feature-list, .faq-grid { grid-template-columns: 1fr; }
      .service-grid, .reviews, .case-grid, .price-grid { grid-template-columns: 1fr; }
      .process { grid-template-columns: 1fr; gap: 14px; }
      .process-step { padding: 0 0 0 58px; }
      .process-step:not(:last-child):after { width: 1px; height: 20px; top: 48px; left: 20px; transform: none; }
      .process-number { position: absolute; left: 0; top: 0; }
      .timeline { grid-template-columns: 1fr 1fr; }
      .articles { grid-template-columns: 1fr 1fr; }
      .case { grid-template-columns: 1fr; }
      .image-box { min-height: 190px; }
      form { grid-template-columns: 1fr; padding: 20px; }
      .full { grid-column: auto; }
      .join { align-items: flex-start; flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .footer-bottom { flex-direction: column; }
    }
    @media (max-width: 440px) {
      h1 { font-size: 34px; }
      .metrics, .solutions, .timeline, .articles, .footer-grid { grid-template-columns: 1fr; }
      .hero-actions .button { width: 100%; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *:before, *:after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
      .reveal { opacity: 1; transform: none; }
    }