:root {
      --blue: #0759d7;
      --blue-deep: #07328f;
      --blue-light: #eaf2ff;
      --ink: #11213d;
      --muted: #66738a;
      --line: #dce6f4;
      --paper: #f5f8fc;
      --white: #ffffff;
      --yellow: #f7c948;
      --green: #0c9b72;
      --shadow: 0 16px 45px rgba(24, 72, 140, .12);
      --radius: 12px;
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
      line-height: 1.7;
    }
    a { color: inherit; text-decoration: none; }
    img { max-width: 100%; height: auto; display: block; }
    button, input, select, textarea { font: inherit; }
    .container { width: min(1180px, calc(100% - 36px)); margin: 0 auto; }
    .section { padding: 88px 0; }
    .section-head { max-width: 720px; margin-bottom: 42px; }
    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: var(--blue);
      font-size: 13px;
      font-weight: 700;
      letter-spacing: 1px;
      text-transform: uppercase;
    }
    .eyebrow::before {
      content: "";
      width: 24px;
      height: 3px;
      background: var(--yellow);
      display: inline-block;
    }
    h1, h2, h3, p { margin-top: 0; }
    h1, h2, h3 { line-height: 1.2; }
    h1 { font-size: clamp(38px, 6vw, 70px); letter-spacing: 0; }
    h2 { font-size: clamp(28px, 4vw, 44px); margin-bottom: 16px; }
    h3 { font-size: 20px; margin-bottom: 10px; }
    .section-head p, .muted { color: var(--muted); }
    .btn {
      border: 0;
      border-radius: 6px;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 9px;
      min-height: 46px;
      padding: 0 22px;
      font-weight: 700;
      transition: transform .25s ease, box-shadow .25s ease, background .25s ease;
    }
    .btn:hover { transform: translateY(-3px); box-shadow: 0 10px 24px rgba(7, 89, 215, .22); }
    .btn-primary { background: var(--blue); color: #fff; }
    .btn-secondary { border: 1px solid #b9cff1; color: var(--blue); background: #fff; }
    .btn-yellow { background: var(--yellow); color: #1b2b4b; }

    header {
      background: #fff;
      border-bottom: 1px solid var(--line);
      position: sticky;
      top: 0;
      z-index: 20;
    }
    .nav {
      min-height: 74px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
    }
    .brand { display: inline-flex; align-items: center; flex: 0 0 auto; }
    .ai-page-logo { width: 138px; }
    .nav-links {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 0;
      margin: 0;
      padding: 0;
      list-style: none;
    }
    .nav-links a {
      display: block;
      padding: 9px 10px;
      color: #30415e;
      font-size: 14px;
      white-space: nowrap;
    }
    .nav-links a:hover { color: var(--blue); }
    .nav-cta { margin-left: 12px; }
    .menu-toggle {
      display: none;
      border: 1px solid var(--line);
      background: #fff;
      color: var(--blue);
      border-radius: 5px;
      width: 42px;
      height: 38px;
      cursor: pointer;
      font-size: 20px;
    }

    .hero {
      color: #fff;
      background: var(--blue);
      overflow: hidden;
      position: relative;
      padding: 86px 0 70px;
    }
    .hero::before, .hero::after {
      content: "";
      position: absolute;
      border: 1px solid rgba(255,255,255,.2);
      transform: rotate(18deg);
      pointer-events: none;
    }
    .hero::before { width: 280px; height: 280px; right: 5%; top: -80px; }
    .hero::after { width: 170px; height: 170px; right: 20%; bottom: -80px; }
    .hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.15fr) minmax(300px, .85fr);
      align-items: center;
      gap: 70px;
      position: relative;
      z-index: 1;
    }
    .hero h1 { max-width: 650px; margin-bottom: 24px; }
    .hero-copy { max-width: 620px; color: #dbe9ff; font-size: 18px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }
    .hero .btn-secondary { border-color: rgba(255,255,255,.5); background: transparent; color: #fff; }
    .hero-board {
      border: 1px solid rgba(255,255,255,.28);
      background: rgba(255,255,255,.1);
      padding: 26px;
      border-radius: 10px;
      box-shadow: 0 20px 60px rgba(0, 29, 100, .22);
      animation: rise .8s ease both;
    }
    .hero-board strong { display: block; font-size: 22px; margin-bottom: 18px; }
    .signal-list { display: grid; gap: 12px; }
    .signal {
      display: flex;
      justify-content: space-between;
      gap: 18px;
      border-bottom: 1px solid rgba(255,255,255,.18);
      padding-bottom: 10px;
      color: #e5efff;
    }
    .signal b { color: var(--yellow); }
    .metric-strip {
      margin-top: -1px;
      background: #fff;
      border-bottom: 1px solid var(--line);
    }
    .metric-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
    .metric { padding: 25px 24px; border-right: 1px solid var(--line); }
    .metric:last-child { border-right: 0; }
    .metric strong { display: block; color: var(--blue); font-size: 30px; }
    .metric span { color: var(--muted); font-size: 14px; }

    .about-band { background: #fff; }
    .about-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 70px; align-items: start; }
    .about-lead { font-size: 22px; color: var(--blue-deep); font-weight: 700; }
    .feature-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin-top: 28px; }
    .feature { border-left: 3px solid var(--yellow); padding: 4px 0 4px 17px; }
    .feature p { color: var(--muted); margin: 0; font-size: 14px; }

    .service-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
    .service-card {
      background: #fff;
      border: 1px solid var(--line);
      padding: 25px 22px;
      border-radius: var(--radius);
      transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
    }
    .service-card:hover { transform: translateY(-5px); border-color: #9bbbe9; box-shadow: var(--shadow); }
    .service-icon {
      width: 42px; height: 42px; display: grid; place-items: center;
      color: #fff; background: var(--blue); border-radius: 6px; font-weight: 800; margin-bottom: 20px;
    }
    .service-card p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 30px; }
    .tag { padding: 7px 12px; border: 1px solid #c9daf3; color: var(--blue-deep); background: #fff; border-radius: 4px; font-size: 13px; }

    .workflow { background: #edf4ff; }
    .steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; }
    .step { position: relative; padding: 16px 22px 16px 0; }
    .step:not(:last-child)::after {
      content: "→";
      position: absolute;
      right: 12px;
      top: 28px;
      color: var(--blue);
      font-size: 22px;
    }
    .step-no { color: var(--blue); font-weight: 800; font-size: 14px; }
    .step p { color: var(--muted); font-size: 14px; margin-bottom: 0; }

    .solution-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
    .solution-card { padding: 25px; background: #fff; border-top: 4px solid var(--blue); box-shadow: 0 8px 26px rgba(17, 57, 115, .07); }
    .solution-card p { color: var(--muted); font-size: 14px; margin-bottom: 0; }

    .network { background: var(--blue-deep); color: #fff; }
    .network .section-head p, .network .muted { color: #c8d8f6; }
    .network-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
    .network-panel { border: 1px solid rgba(255,255,255,.2); padding: 30px; border-radius: 8px; }
    .network-panel h3 { color: #fff; }
    .model-list { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
    .model-list span { background: rgba(255,255,255,.12); padding: 7px 11px; border-radius: 4px; font-size: 13px; color: #edf4ff; }

    .case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
    .case-card { background: #fff; border: 1px solid var(--line); overflow: hidden; border-radius: 8px; }
    .case-image { aspect-ratio: 16 / 9; overflow: hidden; background: #e3ecfb; }
    .case-image img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
    .case-card:hover .case-image img { transform: scale(1.04); }
    .case-content { padding: 22px; }
    .case-content p { color: var(--muted); font-size: 14px; margin-bottom: 0; }

    .compare { background: #fff; }
    .review-score { display: flex; align-items: center; gap: 20px; background: var(--blue); color: #fff; padding: 24px; margin-bottom: 25px; border-radius: 8px; }
    .score-number { font-size: 46px; font-weight: 800; line-height: 1; }
    .stars { color: var(--yellow); font-size: 23px; letter-spacing: 3px; }
    .table-wrap { overflow-x: auto; border: 1px solid var(--line); }
    table { width: 100%; min-width: 700px; border-collapse: collapse; background: #fff; }
    th, td { padding: 16px; border-bottom: 1px solid var(--line); text-align: left; }
    th { background: var(--blue-light); color: var(--blue-deep); }
    td:first-child { font-weight: 700; }
    .yes { color: var(--green); font-weight: 700; }

    .price-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; align-items: stretch; }
    .price-panel { background: #fff; padding: 30px; border: 1px solid var(--line); border-radius: 8px; }
    .price-panel.highlight { background: var(--blue); color: #fff; }
    .price-panel.highlight p, .price-panel.highlight li { color: #d7e6ff; }
    .price-panel ul { padding-left: 20px; color: var(--muted); }
    .price-panel li { margin: 9px 0; }

    .reviews { background: #edf4ff; }
    .review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .review-card { background: #fff; padding: 24px; border-left: 4px solid var(--yellow); }
    .review-card p { color: #40516d; font-size: 14px; }
    .review-author { font-weight: 700; color: var(--blue-deep); font-size: 14px; }

    .article-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .article-card { background: #fff; border: 1px solid var(--line); padding: 22px; }
    .article-card a { color: var(--blue); font-weight: 700; }
    .article-card p { color: var(--muted); font-size: 14px; margin: 9px 0 0; }

    .faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px 25px; align-items: start; }
    details { background: #fff; border: 1px solid var(--line); padding: 18px 20px; }
    summary { cursor: pointer; color: var(--blue-deep); font-weight: 700; list-style-position: inside; }
    details p { color: var(--muted); font-size: 14px; margin: 12px 0 0 23px; }

    .contact { background: #fff; }
    .contact-grid { display: grid; grid-template-columns: .85fr 1.15fr; gap: 50px; align-items: start; }
    .contact-info { background: var(--blue-deep); color: #fff; padding: 30px; border-radius: 8px; }
    .contact-info p { color: #d4e3ff; }
    .contact-item { padding: 14px 0; border-bottom: 1px solid rgba(255,255,255,.18); }
    .contact-item:last-child { border-bottom: 0; }
    .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
    .field { display: grid; gap: 7px; }
    .field.full { grid-column: 1 / -1; }
    label { color: var(--blue-deep); font-weight: 700; font-size: 14px; }
    input, select, textarea { width: 100%; border: 1px solid #cbd9ec; border-radius: 5px; padding: 12px 13px; color: var(--ink); background: #fff; outline: 0; }
    input:focus, select:focus, textarea:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(7,89,215,.1); }
    textarea { min-height: 130px; resize: vertical; }
    .form-note { color: var(--muted); font-size: 13px; margin: 12px 0 20px; }

    .links-section { padding: 35px 0; background: #e9f1fc; }
    .link-row { display: flex; flex-wrap: wrap; gap: 12px 22px; }
    .link-row a { color: var(--blue-deep); font-size: 14px; }
    footer { background: #10254d; color: #d5e3fa; padding: 40px 0 25px; }
    .footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 40px; }
    footer h3 { color: #fff; font-size: 18px; }
    footer a { color: #d5e3fa; font-size: 14px; }
    .copyright { border-top: 1px solid rgba(255,255,255,.16); margin-top: 28px; padding-top: 20px; color: #9db2d4; font-size: 13px; }
    .float-tools { position: fixed; right: 20px; bottom: 20px; z-index: 15; display: grid; gap: 10px; }
    .float-button { width: 48px; height: 48px; border: 0; border-radius: 50%; background: var(--blue); color: #fff; cursor: pointer; box-shadow: 0 8px 20px rgba(7,89,215,.28); }
    .qr-pop { display: none; position: absolute; right: 58px; bottom: 0; width: 150px; padding: 10px; background: #fff; box-shadow: var(--shadow); border-radius: 7px; }
    .qr-pop img { width: 130px; }
    .float-tools:hover .qr-pop { display: block; }
    .reveal { opacity: 0; transform: translateY(18px); transition: opacity .65s ease, transform .65s ease; }
    .reveal.visible { opacity: 1; transform: translateY(0); }
    @keyframes rise { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: translateY(0); } }

    @media (max-width: 1020px) {
      .nav-links a { padding: 8px 6px; font-size: 13px; }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .steps { grid-template-columns: repeat(3, 1fr); gap: 15px; }
      .step:not(:last-child)::after { display: none; }
    }
    @media (max-width: 760px) {
      .container { width: min(100% - 28px, 600px); }
      .section { padding: 62px 0; }
      .menu-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        left: 14px;
        right: 14px;
        top: 66px;
        background: #fff;
        border: 1px solid var(--line);
        box-shadow: var(--shadow);
        padding: 8px;
        flex-direction: column;
        align-items: stretch;
      }
      .nav-links.open { display: flex; }
      .nav-links a { padding: 11px 13px; border-bottom: 1px solid #eef3fa; }
      .nav-cta { display: none; }
      .hero { padding: 60px 0 52px; }
      .hero-grid, .about-grid, .network-grid, .price-grid, .contact-grid { grid-template-columns: 1fr; gap: 32px; }
      .hero h1 { font-size: 43px; }
      .metric-grid { grid-template-columns: repeat(2, 1fr); }
      .metric { border-bottom: 1px solid var(--line); }
      .feature-list, .solution-grid, .case-grid, .review-grid, .article-grid, .faq-grid { grid-template-columns: 1fr; }
      .steps { grid-template-columns: 1fr; }
      .form-grid { grid-template-columns: 1fr; }
      .field.full { grid-column: auto; }
      .footer-grid { grid-template-columns: 1fr; gap: 24px; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { scroll-behavior: auto !important; animation: none !important; transition: none !important; }
    }