:root {
      --ink: #18202f;
      --muted: #657084;
      --paper: #fffdf9;
      --surface: #ffffff;
      --line: #e8e8e5;
      --orange: #ff4d2e;
      --pink: #f02f79;
      --yellow: #ffc928;
      --blue: #2658ef;
      --cyan: #08a7b5;
      --green: #1c9a67;
      --shadow: 0 18px 48px rgba(37, 45, 68, .11);
      --radius: 18px;
      --container: 1180px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background:
        radial-gradient(circle at 88% 9%, rgba(255, 201, 40, .18), transparent 24rem),
        radial-gradient(circle at 5% 44%, rgba(8, 167, 181, .1), transparent 26rem),
        var(--paper);
      font-family: "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
      line-height: 1.7;
    }
    a { color: inherit; text-decoration: none; }
    img { max-width: 100%; height: auto; display: block; }
    .container { width: min(var(--container), calc(100% - 40px)); margin: 0 auto; }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 30;
      background: rgba(255, 253, 249, .94);
      border-bottom: 1px solid rgba(232, 232, 229, .9);
      backdrop-filter: blur(14px);
    }
    .nav-wrap {
      min-height: 76px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }
    .brand { display: inline-flex; align-items: center; gap: 11px; flex-shrink: 0; }
    .ai-page-logo { width: 42px; }
    .brand-name { font-size: 19px; font-weight: 800; letter-spacing: 0; }
    .brand-sub { display: block; color: var(--muted); font-size: 11px; line-height: 1.2; }
    .nav-links {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 0;
      flex-wrap: wrap;
    }
    .nav-links a {
      padding: 8px 10px;
      color: #4d5667;
      font-size: 13px;
      transition: color .2s ease, transform .2s ease;
    }
    .nav-links a:hover { color: var(--orange); transform: translateY(-2px); }
    .nav-cta, .button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border: 0;
      border-radius: 9px;
      padding: 12px 19px;
      color: #fff;
      background: var(--orange);
      font-weight: 700;
      cursor: pointer;
      box-shadow: 0 8px 18px rgba(255, 77, 46, .22);
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    }
    .nav-cta { margin-left: 14px; padding: 10px 15px; font-size: 13px; }
    .button:hover, .nav-cta:hover { transform: translateY(-3px); box-shadow: 0 12px 24px rgba(255, 77, 46, .3); }
    .button.secondary { color: var(--blue); background: #eef2ff; box-shadow: none; }
    .button.dark { background: var(--ink); box-shadow: none; }
    .menu-toggle { display: none; border: 0; background: transparent; font-size: 26px; color: var(--ink); cursor: pointer; }
    .hero {
      position: relative;
      overflow: hidden;
      padding: 78px 0 70px;
      background:
        linear-gradient(135deg, #fffdf9 0%, #fff4e9 48%, #f3fbff 100%);
      border-bottom: 1px solid #f1e9de;
    }
    .hero-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(360px, .95fr); gap: 54px; align-items: center; }
    .eyebrow, .section-kicker {
      color: var(--orange);
      font-size: 13px;
      font-weight: 800;
      letter-spacing: 1px;
      text-transform: uppercase;
    }
    h1, h2, h3, p { margin-top: 0; }
    h1 { max-width: 650px; margin-bottom: 22px; font-size: clamp(38px, 5vw, 68px); line-height: 1.12; letter-spacing: 0; }
    h1 strong { color: var(--orange); }
    .hero-copy { max-width: 630px; color: #4f5a6d; font-size: 18px; }
    .hero-actions { display: flex; gap: 13px; flex-wrap: wrap; margin: 30px 0 26px; }
    .hero-note { color: var(--muted); font-size: 13px; }
    .hero-panel {
      position: relative;
      padding: 24px;
      background: #1a2441;
      color: #fff;
      border-radius: 24px;
      box-shadow: 20px 24px 0 #ffc928, var(--shadow);
      animation: floatPanel 5s ease-in-out infinite;
    }
    .hero-panel:before {
      content: "";
      position: absolute;
      right: -18px;
      top: -18px;
      width: 66px;
      height: 66px;
      background: var(--pink);
      border-radius: 50%;
    }
    .hero-panel-head { position: relative; display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
    .hero-panel-title { font-size: 18px; font-weight: 800; }
    .live-dot { width: 10px; height: 10px; border-radius: 50%; background: #54e6a3; box-shadow: 0 0 0 6px rgba(84,230,163,.15); }
    .metric-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .metric {
      padding: 17px;
      min-height: 116px;
      background: rgba(255,255,255,.1);
      border: 1px solid rgba(255,255,255,.15);
      border-radius: 13px;
    }
    .metric b { display: block; color: #fff; font-size: 29px; line-height: 1.2; }
    .metric span { color: #c9d1e4; font-size: 12px; }
    .hero-strip { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 18px; }
    .hero-strip span { padding: 6px 10px; color: #17213e; background: var(--yellow); border-radius: 99px; font-size: 12px; font-weight: 800; }
    .section { padding: 92px 0; }
    .section.alt { background: #f5f9ff; }
    .section.tint { background: linear-gradient(120deg, #fff1ed, #fffaf0 45%, #effbfb); }
    .section-head { display: flex; align-items: end; justify-content: space-between; gap: 25px; margin-bottom: 34px; }
    .section-head h2 { max-width: 620px; margin: 7px 0 0; font-size: clamp(28px, 4vw, 44px); line-height: 1.2; }
    .section-head p { max-width: 510px; margin: 0; color: var(--muted); }
    .intro-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 22px; }
    .intro-copy { padding: 28px 30px; background: var(--surface); border-left: 5px solid var(--orange); box-shadow: var(--shadow); border-radius: var(--radius); }
    .intro-copy p { color: #4f5a6d; }
    .intro-points { display: grid; gap: 12px; }
    .point { display: flex; gap: 15px; padding: 18px; background: #fff; border: 1px solid var(--line); border-radius: 13px; }
    .point-mark { display: grid; place-items: center; width: 34px; height: 34px; flex-shrink: 0; color: #fff; background: var(--blue); border-radius: 10px; font-weight: 800; }
    .point h3 { margin-bottom: 3px; font-size: 16px; }
    .point p { margin: 0; color: var(--muted); font-size: 13px; }
    .service-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
    .service-card {
      position: relative;
      padding: 22px;
      min-height: 220px;
      background: #fff;
      border: 1px solid #ece9e4;
      border-radius: 14px;
      overflow: hidden;
      transition: transform .25s ease, box-shadow .25s ease;
    }
    .service-card:hover { transform: translateY(-7px); box-shadow: var(--shadow); }
    .service-card:nth-child(4n+1) { border-top: 4px solid var(--orange); }
    .service-card:nth-child(4n+2) { border-top: 4px solid var(--blue); }
    .service-card:nth-child(4n+3) { border-top: 4px solid var(--pink); }
    .service-card:nth-child(4n) { border-top: 4px solid var(--cyan); }
    .service-icon { width: 43px; height: 43px; display: grid; place-items: center; color: #fff; background: var(--ink); border-radius: 12px; font-size: 19px; font-weight: 800; }
    .service-card h3 { margin: 17px 0 8px; font-size: 18px; }
    .service-card p { margin-bottom: 0; color: var(--muted); font-size: 13px; }
    .tag-cloud { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 26px; }
    .tag-cloud span { padding: 8px 13px; color: #213052; background: #e7efff; border-radius: 7px; font-size: 13px; }
    .tag-cloud span:nth-child(3n) { background: #ffe5df; color: #a83523; }
    .tag-cloud span:nth-child(4n) { background: #fff1bc; color: #745b00; }
    .workflow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; counter-reset: step; }
    .step { position: relative; padding: 26px 22px 22px; border-top: 2px solid var(--orange); }
    .step:not(:last-child):after { content: ""; position: absolute; top: -7px; right: -6px; width: 12px; height: 12px; border-right: 2px solid var(--orange); border-top: 2px solid var(--orange); transform: rotate(45deg); background: var(--paper); }
    .step-number { color: var(--orange); font-size: 38px; font-weight: 900; line-height: 1; }
    .step h3 { margin: 13px 0 7px; font-size: 18px; }
    .step p { margin: 0; color: var(--muted); font-size: 13px; }
    .solution-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .solution { padding: 24px; background: #17213e; color: #fff; border-radius: 15px; }
    .solution:nth-child(2) { background: var(--pink); }
    .solution:nth-child(3) { background: var(--cyan); }
    .solution h3 { margin-bottom: 8px; font-size: 20px; }
    .solution p { margin-bottom: 0; color: rgba(255,255,255,.84); font-size: 14px; }
    .network { display: grid; grid-template-columns: .8fr 1.2fr; gap: 34px; align-items: center; }
    .network-copy { padding-right: 20px; }
    .network-list { display: flex; flex-wrap: wrap; gap: 11px; }
    .network-list span { padding: 11px 15px; background: #fff; border: 1px solid #dce4ef; border-radius: 9px; color: #33415c; font-weight: 700; font-size: 13px; }
    .case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .case { overflow: hidden; background: #fff; border: 1px solid var(--line); border-radius: 15px; }
    .case-media { aspect-ratio: 16 / 8; overflow: hidden; background: #f2f4f7; }
    .case-media img { width: 100%; height: 100%; object-fit: cover; }
    .case-body { padding: 20px; }
    .case-body h3 { margin-bottom: 7px; }
    .case-body p { margin: 0; color: var(--muted); font-size: 13px; }
    .compare-wrap { overflow-x: auto; background: #fff; border: 1px solid var(--line); border-radius: 15px; box-shadow: 0 10px 30px rgba(37,45,68,.05); }
    .compare { width: 100%; min-width: 760px; border-collapse: collapse; }
    .compare th, .compare td { padding: 16px 18px; text-align: left; border-bottom: 1px solid #edf0f4; }
    .compare th { color: #fff; background: var(--ink); font-size: 14px; }
    .compare th:nth-child(2) { background: var(--orange); }
    .compare td { color: #526074; font-size: 13px; }
    .compare td:first-child { color: var(--ink); font-weight: 700; }
    .rating { display: flex; align-items: center; gap: 16px; margin-bottom: 25px; }
    .rating-score { color: var(--orange); font-size: 48px; font-weight: 900; line-height: 1; }
    .stars { color: var(--yellow); font-size: 25px; letter-spacing: 2px; }
    .rating small { color: var(--muted); }
    .price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .price { padding: 25px; background: #fff; border: 1px solid var(--line); border-radius: 14px; }
    .price.featured { background: #fff3ed; border: 2px solid var(--orange); }
    .price h3 { margin-bottom: 10px; }
    .price strong { display: block; margin-bottom: 10px; color: var(--orange); font-size: 28px; }
    .price p { margin-bottom: 0; color: var(--muted); font-size: 13px; }
    .reviews { display: grid; grid-template-columns: repeat(3, 1fr); gap: 17px; }
    .review { padding: 23px; background: #fff; border: 1px solid var(--line); border-radius: 14px; }
    .review-top { display: flex; justify-content: space-between; gap: 10px; margin-bottom: 13px; }
    .review-name { font-weight: 800; }
    .review-role { color: var(--orange); font-size: 12px; }
    .review p { margin-bottom: 0; color: #596579; font-size: 13px; }
    .review:before { content: "“"; display: block; height: 22px; color: var(--pink); font-family: Georgia, serif; font-size: 38px; line-height: .7; }
    .article-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
    .article { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding: 17px 19px; background: #fff; border-bottom: 1px solid #edf0f4; }
    .article:first-child { border-radius: 12px 12px 0 0; }
    .article:last-child { border-radius: 0 0 12px 12px; }
    .article-title { font-weight: 700; }
    .article-meta { color: var(--muted); font-size: 12px; white-space: nowrap; }
    .faq-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px 18px; }
    details { padding: 18px 20px; background: #fff; border: 1px solid var(--line); border-radius: 11px; }
    summary { cursor: pointer; list-style: none; font-weight: 700; padding-right: 20px; position: relative; }
    summary::-webkit-details-marker { display: none; }
    summary:after { content: "+"; position: absolute; right: 0; color: var(--orange); font-size: 20px; line-height: 1; }
    details[open] summary:after { content: "−"; }
    details p { margin: 11px 0 0; color: var(--muted); font-size: 13px; }
    .contact-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 28px; align-items: start; }
    .contact-info { padding: 30px; background: var(--ink); color: #fff; border-radius: 18px; }
    .contact-info h2 { margin-bottom: 13px; font-size: 32px; }
    .contact-info p { color: #cbd3e2; }
    .contact-lines { display: grid; gap: 12px; margin-top: 25px; }
    .contact-line { display: flex; gap: 12px; align-items: center; color: #e9eef8; font-size: 14px; }
    .contact-label { width: 72px; color: #8fe4dc; font-weight: 700; }
    .form-box { padding: 28px; background: #fff; border: 1px solid var(--line); border-radius: 18px; }
    .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
    .field { display: grid; gap: 7px; }
    .field.full { grid-column: 1 / -1; }
    label { font-size: 13px; font-weight: 700; }
    input, select, textarea { width: 100%; padding: 12px 13px; color: var(--ink); background: #fbfcfe; border: 1px solid #dfe4ec; border-radius: 8px; font: inherit; outline: none; }
    input:focus, select:focus, textarea:focus { border-color: var(--orange); box-shadow: 0 0 0 3px rgba(255,77,46,.1); }
    textarea { min-height: 120px; resize: vertical; }
    .form-submit { margin-top: 17px; }
    .qr-box { margin-top: 24px; display: flex; gap: 14px; align-items: center; }
    .qr-box img { width: 86px; border-radius: 8px; background: #fff; padding: 5px; }
    .qr-box span { color: #dbe3f1; font-size: 12px; }
    .join-banner { display: flex; align-items: center; justify-content: space-between; gap: 25px; padding: 30px; color: #fff; background: linear-gradient(110deg, var(--pink), var(--orange)); border-radius: 18px; }
    .join-banner h2 { margin-bottom: 5px; font-size: 29px; }
    .join-banner p { margin: 0; color: rgba(255,255,255,.85); }
    .join-banner .button { color: var(--ink); background: var(--yellow); box-shadow: none; white-space: nowrap; }
    .footer { padding: 42px 0 25px; color: #dce4f2; background: #17213e; }
    .footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 35px; padding-bottom: 30px; }
    .footer .brand-name { color: #fff; }
    .footer .brand-sub { color: #aebbd1; }
    .footer p { color: #aebbd1; font-size: 13px; }
    .footer h3 { color: #fff; font-size: 15px; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 8px 15px; }
    .footer-links a { color: #b9c6da; font-size: 13px; }
    .footer-links a:hover { color: var(--yellow); }
    .footer-bottom { padding-top: 20px; border-top: 1px solid rgba(255,255,255,.14); color: #9caac0; font-size: 12px; }
    .float-actions { position: fixed; right: 18px; bottom: 20px; z-index: 20; display: grid; gap: 9px; }
    .float-actions a, .back-top { width: 46px; height: 46px; display: grid; place-items: center; color: #fff; background: var(--orange); border: 0; border-radius: 50%; box-shadow: 0 8px 18px rgba(255,77,46,.3); cursor: pointer; font-weight: 800; }
    .back-top { background: var(--ink); }
    .reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s ease, transform .7s ease; }
    .reveal.visible { opacity: 1; transform: translateY(0); }
    @keyframes floatPanel { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-7px); } }
    @media (max-width: 1050px) {
      .nav-links a { padding-left: 6px; padding-right: 6px; }
      .service-grid { grid-template-columns: repeat(3, 1fr); }
    }
    @media (max-width: 820px) {
      .container { width: min(var(--container), calc(100% - 28px)); }
      .menu-toggle { display: block; }
      .nav-links { position: absolute; left: 14px; right: 14px; top: 70px; display: none; padding: 12px; background: #fff; border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow); }
      .nav-links.open { display: grid; grid-template-columns: repeat(2, 1fr); }
      .nav-links a { padding: 10px; }
      .nav-cta { margin: 0; }
      .hero-grid, .intro-grid, .network, .contact-grid { grid-template-columns: 1fr; }
      .hero { padding-top: 54px; }
      .hero-panel { max-width: 620px; }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .workflow { grid-template-columns: repeat(2, 1fr); gap: 18px; }
      .step:not(:last-child):after { display: none; }
      .solution-grid, .case-grid, .reviews, .price-grid { grid-template-columns: 1fr 1fr; }
      .faq-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .article-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 560px) {
      .brand-sub { display: none; }
      h1 { font-size: 40px; }
      .hero-copy { font-size: 16px; }
      .hero-panel { padding: 19px; box-shadow: 10px 12px 0 #ffc928, var(--shadow); }
      .metric { min-height: 96px; padding: 13px; }
      .metric b { font-size: 24px; }
      .section { padding: 64px 0; }
      .section-head { display: block; }
      .section-head p { margin-top: 15px; }
      .service-grid, .solution-grid, .case-grid, .reviews, .price-grid, .workflow, .footer-grid { grid-template-columns: 1fr; }
      .form-grid { grid-template-columns: 1fr; }
      .field.full { grid-column: auto; }
      .join-banner { display: block; }
      .join-banner .button { margin-top: 18px; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *:before, *:after { scroll-behavior: auto !important; animation: none !important; transition: none !important; }
    }