:root {
      --blue: #0757c9;
      --blue-deep: #073a8d;
      --ink: #12213c;
      --muted: #60708b;
      --line: #dbe6f5;
      --paper: #f6f9fe;
      --white: #fff;
      --cyan: #13a9d6;
      --gold: #f3b63f;
      --shadow: 0 18px 50px rgba(16, 66, 137, .11);
      --radius: 12px;
      --container: 1180px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: 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: 20;
      background: rgba(255,255,255,.95);
      border-bottom: 1px solid rgba(219,230,245,.9);
      backdrop-filter: blur(14px);
    }
    .nav {
      min-height: 76px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }
    .brand { display: inline-flex; align-items: center; min-width: 150px; }
    .ai-page-logo { width: 142px; }
    .nav-links {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 0;
      flex-wrap: wrap;
    }
    .nav-links a {
      padding: 8px 11px;
      color: #334664;
      font-size: 14px;
      transition: color .2s ease;
    }
    .nav-links a:hover { color: var(--blue); }
    .nav-cta, .button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border: 0;
      border-radius: 7px;
      padding: 12px 20px;
      background: var(--blue);
      color: #fff;
      font-weight: 700;
      cursor: pointer;
      box-shadow: 0 8px 18px rgba(7,87,201,.2);
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    }
    .nav-cta { white-space: nowrap; padding: 10px 15px; font-size: 14px; }
    .button:hover, .nav-cta:hover { transform: translateY(-2px); background: var(--blue-deep); box-shadow: 0 12px 24px rgba(7,87,201,.25); }
    .button.secondary { background: #e8f1ff; color: var(--blue-deep); box-shadow: none; }
    .button.light { background: #fff; color: var(--blue-deep); box-shadow: none; }
    .menu-toggle { display: none; border: 1px solid var(--line); background: #fff; color: var(--blue-deep); border-radius: 6px; padding: 8px 12px; font-size: 20px; }
    .hero {
      position: relative;
      overflow: hidden;
      background: linear-gradient(125deg, #062f80 0%, #0757c9 55%, #0e94c8 100%);
      color: #fff;
      padding: 86px 0 68px;
    }
    .hero:before, .hero:after {
      content: "";
      position: absolute;
      border: 1px solid rgba(255,255,255,.18);
      transform: rotate(25deg);
      pointer-events: none;
    }
    .hero:before { width: 440px; height: 440px; right: -130px; top: -220px; border-radius: 28px; }
    .hero:after { width: 250px; height: 250px; left: -120px; bottom: -150px; border-radius: 50%; }
    .hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 60px; align-items: center; position: relative; z-index: 1; }
    .eyebrow, .section-kicker {
      display: inline-block;
      color: var(--cyan);
      font-size: 13px;
      font-weight: 800;
      letter-spacing: 1px;
      text-transform: uppercase;
    }
    .hero .eyebrow { color: #9de8ff; }
    h1, h2, h3, p { margin-top: 0; }
    h1 { max-width: 700px; margin-bottom: 20px; font-size: clamp(36px, 5vw, 66px); line-height: 1.12; letter-spacing: 0; }
    .hero-copy { max-width: 650px; color: rgba(255,255,255,.86); font-size: 18px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 30px 0 32px; }
    .hero-note { color: rgba(255,255,255,.75); font-size: 13px; }
    .hero-panel { border: 1px solid rgba(255,255,255,.25); background: rgba(4,34,96,.32); border-radius: 14px; padding: 26px; box-shadow: 0 22px 50px rgba(2,25,75,.2); }
    .hero-panel h2 { font-size: 20px; margin-bottom: 20px; }
    .signal-list { display: grid; gap: 14px; }
    .signal { display: flex; align-items: center; justify-content: space-between; padding: 13px 0; border-bottom: 1px solid rgba(255,255,255,.17); }
    .signal:last-child { border-bottom: 0; }
    .signal strong { font-size: 26px; color: #fff; }
    .signal span { color: rgba(255,255,255,.76); font-size: 14px; }
    .metrics { margin-top: -1px; background: #fff; border-bottom: 1px solid var(--line); }
    .metric-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
    .metric { padding: 24px 22px; border-right: 1px solid var(--line); }
    .metric:last-child { border-right: 0; }
    .metric strong { display: block; color: var(--blue-deep); font-size: 30px; line-height: 1.2; }
    .metric span { color: var(--muted); font-size: 14px; }
    section { padding: 88px 0; }
    .section-head { max-width: 700px; margin-bottom: 38px; }
    .section-head h2 { margin: 8px 0 12px; color: var(--ink); font-size: clamp(28px, 4vw, 43px); line-height: 1.2; }
    .section-head p { color: var(--muted); margin-bottom: 0; }
    .about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 52px; align-items: start; }
    .about-lead { font-size: 21px; color: var(--blue-deep); font-weight: 700; }
    .ticks { display: grid; gap: 14px; padding: 0; margin: 28px 0 0; list-style: none; }
    .ticks li { position: relative; padding-left: 30px; color: #445673; }
    .ticks li:before { content: "✓"; position: absolute; left: 0; top: 0; color: var(--cyan); font-weight: 900; }
    .capability-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
    .capability { background: #fff; border-top: 3px solid var(--blue); padding: 24px; border-radius: var(--radius); box-shadow: var(--shadow); transition: transform .22s ease, box-shadow .22s ease; }
    .capability:hover, .review:hover, .case:hover { transform: translateY(-5px); box-shadow: 0 20px 42px rgba(16,66,137,.17); }
    .capability .icon { width: 42px; height: 42px; display: grid; place-items: center; background: #e8f2ff; color: var(--blue); border-radius: 8px; font-size: 21px; margin-bottom: 18px; }
    .capability h3 { font-size: 18px; margin-bottom: 8px; }
    .capability p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .service-section { background: #edf5ff; }
    .service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .service { background: #fff; border: 1px solid var(--line); padding: 23px; border-radius: 10px; }
    .service h3 { color: var(--blue-deep); font-size: 18px; margin-bottom: 7px; }
    .service p { color: var(--muted); font-size: 14px; margin: 0; }
    .service-tag { color: var(--cyan); font-weight: 800; font-size: 12px; }
    .process { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; border-top: 1px solid var(--line); }
    .step { position: relative; padding: 28px 20px 10px 0; margin-right: 24px; }
    .step:after { content: ""; position: absolute; top: 45px; right: 0; width: 24px; height: 1px; background: var(--cyan); }
    .step:last-child:after { display: none; }
    .step-number { display: grid; place-items: center; width: 36px; height: 36px; background: var(--blue); color: #fff; border-radius: 50%; font-weight: 800; margin-bottom: 18px; }
    .step h3 { font-size: 17px; margin-bottom: 7px; }
    .step p { color: var(--muted); font-size: 14px; }
    .dark-section { background: #092e70; color: #fff; }
    .dark-section .section-head h2, .dark-section h3 { color: #fff; }
    .dark-section .section-head p, .dark-section p { color: rgba(255,255,255,.72); }
    .solution-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
    .solution { border: 1px solid rgba(255,255,255,.18); padding: 26px; border-radius: 10px; background: rgba(255,255,255,.06); }
    .solution h3 { margin-bottom: 9px; }
    .solution span { color: #a9eaff; font-size: 13px; font-weight: 800; }
    .network { display: flex; flex-wrap: wrap; gap: 10px; }
    .network span, .tag { border: 1px solid #b9d2f3; color: var(--blue-deep); padding: 8px 13px; border-radius: 5px; background: #fff; font-size: 14px; }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 10px; }
    .tag-cloud .tag { background: #edf5ff; border-color: #d5e5fb; }
    .compare-wrap { overflow-x: auto; background: #fff; border: 1px solid var(--line); border-radius: 10px; box-shadow: var(--shadow); }
    table { width: 100%; min-width: 760px; border-collapse: collapse; }
    th, td { padding: 17px 18px; text-align: left; border-bottom: 1px solid var(--line); }
    th { background: #eaf3ff; color: var(--blue-deep); }
    td { color: #53647d; font-size: 14px; }
    tr:last-child td { border-bottom: 0; }
    .score-box { display: flex; align-items: center; gap: 22px; margin-bottom: 25px; padding: 23px; border-left: 4px solid var(--gold); background: #fff; box-shadow: var(--shadow); }
    .score-box strong { color: var(--blue-deep); font-size: 42px; line-height: 1; }
    .stars { color: var(--gold); letter-spacing: 3px; font-size: 21px; }
    .two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
    .case-grid, .review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .case, .review { background: #fff; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; transition: transform .22s ease, box-shadow .22s ease; }
    .case-media { aspect-ratio: 16 / 8; overflow: hidden; background: #dcecff; }
    .case-media img { width: 100%; height: 100%; object-fit: cover; }
    .case-content, .review-content { padding: 20px; }
    .case-content h3, .review-content h3 { margin-bottom: 8px; font-size: 18px; }
    .case-content p, .review-content p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .review-content { min-height: 190px; }
    .review-meta { color: var(--blue); font-size: 13px; font-weight: 700; margin-bottom: 12px; }
    .price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .price { background: #fff; border: 1px solid var(--line); padding: 24px; border-radius: 10px; }
    .price strong { display: block; font-size: 29px; color: var(--blue-deep); margin: 8px 0; }
    .price p { color: var(--muted); font-size: 14px; }
    .price:first-child { border-top: 4px solid var(--cyan); }
    .price:nth-child(2) { border-top: 4px solid var(--blue); }
    .price:nth-child(3) { border-top: 4px solid var(--gold); }
    .article-list { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
    .article-list a { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 16px 18px; background: #fff; border: 1px solid var(--line); border-radius: 7px; color: var(--blue-deep); }
    .article-list a span { color: var(--muted); font-size: 13px; }
    .faq-list { display: grid; gap: 10px; max-width: 900px; }
    details { background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 0 20px; }
    summary { cursor: pointer; padding: 17px 0; color: var(--blue-deep); font-weight: 700; }
    details p { color: var(--muted); padding: 0 0 17px; margin: 0; font-size: 14px; }
    .form-section { background: #e8f3ff; }
    .contact-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 44px; align-items: start; }
    .contact-info { background: var(--blue-deep); color: #fff; padding: 30px; border-radius: 12px; }
    .contact-info h3 { color: #fff; }
    .contact-info p { color: rgba(255,255,255,.75); }
    .contact-info a { color: #aeeaff; }
    .qr { width: 150px; margin-top: 18px; background: #fff; padding: 8px; border-radius: 6px; }
    form { background: #fff; padding: 28px; border: 1px solid var(--line); border-radius: 12px; box-shadow: var(--shadow); }
    .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
    label { display: grid; gap: 7px; color: #425570; font-size: 14px; font-weight: 700; }
    input, select, textarea { width: 100%; border: 1px solid #cbd9ed; border-radius: 6px; padding: 12px 13px; font: inherit; color: var(--ink); background: #fbfdff; outline: none; }
    input:focus, select:focus, textarea:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(7,87,201,.1); }
    textarea { min-height: 125px; resize: vertical; }
    .full { grid-column: 1 / -1; }
    .form-submit { margin-top: 18px; }
    .footer { background: #071d47; color: #d7e5fa; padding: 46px 0 25px; }
    .footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr 1fr; gap: 30px; }
    .footer h3 { color: #fff; font-size: 16px; margin-bottom: 14px; }
    .footer p, .footer a { color: #b7c8e3; font-size: 14px; }
    .footer a { display: block; margin: 7px 0; }
    .footer a:hover { color: #fff; }
    .copyright { border-top: 1px solid rgba(255,255,255,.14); margin-top: 28px; padding-top: 18px; color: #91a7c7; font-size: 13px; }
    .float-contact, .back-top { position: fixed; right: 20px; z-index: 15; border: 0; cursor: pointer; box-shadow: 0 10px 25px rgba(5,42,103,.22); }
    .float-contact { bottom: 76px; background: var(--cyan); color: #fff; padding: 12px 15px; border-radius: 7px; font-weight: 700; }
    .back-top { bottom: 20px; display: none; width: 40px; height: 40px; border-radius: 50%; background: var(--blue); color: #fff; font-size: 18px; }
    .reveal { opacity: 0; transform: translateY(18px); transition: opacity .65s ease, transform .65s ease; }
    .reveal.visible { opacity: 1; transform: translateY(0); }
    @media (max-width: 980px) {
      .nav-links { display: none; position: absolute; top: 76px; left: 20px; right: 20px; padding: 12px; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow); }
      .nav-links.open { display: grid; grid-template-columns: 1fr 1fr; }
      .nav-links a { padding: 10px; }
      .menu-toggle { display: block; }
      .hero-grid, .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 34px; }
      .capability-grid { grid-template-columns: repeat(2, 1fr); }
      .process { grid-template-columns: repeat(3, 1fr); }
      .step:after { display: none; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 640px) {
      .container { width: min(var(--container), calc(100% - 28px)); }
      .nav { min-height: 68px; }
      .nav-links { top: 68px; left: 14px; right: 14px; }
      .hero { padding: 58px 0 50px; }
      h1 { font-size: 38px; }
      .hero-copy { font-size: 16px; }
      section { padding: 60px 0; }
      .metric-grid, .capability-grid, .service-grid, .solution-grid, .case-grid, .review-grid, .price-grid, .two-col, .article-list, .footer-grid { grid-template-columns: 1fr; }
      .metric { border-right: 0; border-bottom: 1px solid var(--line); }
      .metric:last-child { border-bottom: 0; }
      .process { grid-template-columns: 1fr; }
      .step { margin-right: 0; padding: 20px 0 2px; }
      .form-grid { grid-template-columns: 1fr; }
      .full { grid-column: auto; }
      .score-box { align-items: flex-start; flex-direction: column; gap: 9px; }
      .float-contact { right: 14px; }
    }