:root {
      --ink: #17243a;
      --muted: #637089;
      --line: #dce5ee;
      --paper: #f7fafc;
      --white: #ffffff;
      --navy: #10233f;
      --coral: #ff5f61;
      --cyan: #15b8c9;
      --lime: #d7ed63;
      --yellow: #ffc857;
      --blue: #3b68ec;
      --shadow: 0 18px 45px rgba(16,35,63,.10);
      --radius: 18px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      font-family: "PingFang SC","Microsoft YaHei","Noto Sans 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% - 40px)); margin: 0 auto; }
    .section { padding: 92px 0; position: relative; }
    .section-head { max-width: 720px; margin-bottom: 42px; }
    .eyebrow {
      display: inline-flex; align-items: center; gap: 8px;
      color: var(--coral); font-size: 13px; font-weight: 800; letter-spacing: 1px;
      text-transform: uppercase; margin-bottom: 12px;
    }
    .eyebrow::before { content: ""; width: 26px; height: 4px; background: var(--coral); border-radius: 3px; }
    h1,h2,h3,p { margin-top: 0; }
    h1 { font-size: clamp(42px, 6vw, 78px); line-height: 1.08; letter-spacing: 0; margin-bottom: 24px; }
    h2 { font-size: clamp(30px, 4vw, 48px); line-height: 1.15; margin-bottom: 16px; }
    h3 { font-size: 20px; line-height: 1.35; margin-bottom: 10px; }
    .lead { color: var(--muted); font-size: 18px; max-width: 650px; }
    .btn {
      display: inline-flex; align-items: center; justify-content: center; gap: 9px;
      min-height: 48px; padding: 0 21px; border: 1px solid transparent; border-radius: 10px;
      font-weight: 800; cursor: pointer; transition: transform .2s, box-shadow .2s, background .2s;
    }
    .btn:hover { transform: translateY(-3px); box-shadow: 0 10px 20px rgba(16,35,63,.14); }
    .btn-primary { color: var(--white); background: var(--coral); }
    .btn-dark { color: var(--white); background: var(--navy); }
    .btn-light { color: var(--navy); background: var(--white); border-color: var(--line); }
    .btn-cyan { color: var(--navy); background: var(--cyan); }
    .site-header {
      position: sticky; top: 0; z-index: 20; background: rgba(255,255,255,.94);
      border-bottom: 1px solid var(--line); backdrop-filter: blur(12px);
    }
    .nav-wrap { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 22px; }
    .brand { display: inline-flex; align-items: center; flex: 0 0 auto; }
    .ai-page-logo { width: 128px; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; gap: 0; flex-wrap: wrap; }
    .nav-links a { color: #42516a; font-size: 13px; padding: 7px 9px; white-space: nowrap; transition: color .2s; }
    .nav-links a:hover { color: var(--coral); }
    .nav-cta { margin-left: 10px; padding: 10px 15px; font-size: 13px; }
    .menu-toggle { display: none; border: 0; background: transparent; color: var(--navy); font-size: 25px; cursor: pointer; }
    .hero {
      overflow: hidden; color: var(--white); background: var(--navy); padding: 96px 0 76px;
      position: relative;
    }
    .hero::before, .hero::after { content: ""; position: absolute; pointer-events: none; }
    .hero::before { width: 360px; height: 360px; right: -100px; top: -120px; border-radius: 50%; background: var(--cyan); opacity: .85; }
    .hero::after { width: 250px; height: 250px; left: 42%; bottom: -150px; transform: rotate(25deg); background: var(--coral); }
    .hero-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 70px; align-items: center; position: relative; z-index: 1; }
    .hero .eyebrow { color: var(--lime); }
    .hero .eyebrow::before { background: var(--lime); }
    .hero .lead { color: #d6e1ee; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 30px 0 34px; }
    .hero-actions .btn-primary { background: var(--lime); color: var(--navy); }
    .hero-points { display: flex; flex-wrap: wrap; gap: 10px; color: #d6e1ee; font-size: 14px; }
    .hero-points span { padding: 7px 11px; border: 1px solid rgba(255,255,255,.23); border-radius: 30px; }
    .hero-panel { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
    .metric {
      padding: 24px 20px; min-height: 144px; border-radius: 16px; color: var(--navy);
      background: var(--white); box-shadow: 0 18px 35px rgba(0,0,0,.16); animation: rise .7s ease both;
    }
    .metric:nth-child(2) { background: var(--lime); animation-delay: .08s; }
    .metric:nth-child(3) { background: var(--cyan); animation-delay: .16s; }
    .metric:nth-child(4) { background: var(--yellow); animation-delay: .24s; }
    .metric strong { display: block; font-size: 34px; line-height: 1; margin-bottom: 10px; }
    .metric small { font-weight: 700; }
    @keyframes rise { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: translateY(0); } }
    .strip { background: var(--coral); color: var(--white); padding: 16px 0; }
    .strip-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
    .strip strong { font-size: 18px; }
    .strip span { color: #fff2f2; font-size: 14px; }
    .intro-grid { display: grid; grid-template-columns: .85fr 1.15fr; gap: 54px; align-items: start; }
    .intro-note { border-left: 5px solid var(--cyan); padding: 4px 0 4px 24px; font-size: 21px; font-weight: 700; }
    .intro-copy p { color: var(--muted); }
    .feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .feature { padding: 25px; background: var(--white); border: 1px solid var(--line); border-top: 4px solid var(--blue); border-radius: var(--radius); transition: transform .25s, box-shadow .25s; }
    .feature:nth-child(2n) { border-top-color: var(--coral); }
    .feature:nth-child(3n) { border-top-color: var(--cyan); }
    .feature:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
    .feature-icon { width: 40px; height: 40px; display: grid; place-items: center; margin-bottom: 16px; color: var(--navy); background: var(--lime); border-radius: 10px; font-weight: 900; }
    .feature p, .service p, .review p, .case p, .faq-answer { color: var(--muted); font-size: 14px; }
    .service-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
    .service { padding: 20px; background: var(--white); border: 1px solid var(--line); border-radius: 14px; transition: transform .2s, border-color .2s; }
    .service:hover { transform: translateY(-4px); border-color: var(--coral); }
    .service h3 { font-size: 17px; }
    .service p { margin-bottom: 0; }
    .service-tag { display: inline-block; color: var(--blue); font-size: 12px; font-weight: 800; margin-bottom: 12px; }
    .band { background: #eaf6f5; }
    .workflow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; counter-reset: step; }
    .step { position: relative; padding: 12px 22px 12px 0; }
    .step:not(:last-child)::after { content: "→"; position: absolute; right: 12px; top: 20px; color: var(--coral); font-size: 25px; font-weight: 900; }
    .step-no { width: 42px; height: 42px; display: grid; place-items: center; margin-bottom: 15px; border-radius: 50%; color: var(--navy); background: var(--yellow); font-weight: 900; }
    .step p { color: var(--muted); font-size: 14px; }
    .solution-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
    .solution { padding: 28px; border-radius: 18px; background: var(--navy); color: var(--white); }
    .solution:nth-child(2) { background: var(--blue); }
    .solution:nth-child(3) { background: var(--coral); }
    .solution:nth-child(4) { background: var(--cyan); color: var(--navy); }
    .solution p { color: rgba(255,255,255,.82); font-size: 14px; }
    .solution:nth-child(4) p { color: #17384a; }
    .network-box { padding: 30px; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 10px; }
    .tag-cloud span { padding: 8px 13px; color: var(--navy); background: #e8f0ff; border-radius: 5px; font-size: 14px; }
    .tag-cloud span:nth-child(3n) { background: #fff0d0; }
    .tag-cloud span:nth-child(4n) { background: #e2f7ef; }
    .case-grid, .review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .case { overflow: hidden; background: var(--white); border: 1px solid var(--line); border-radius: 16px; }
    .case-media { background: #edf3f7; aspect-ratio: 16 / 8; display: grid; place-items: center; overflow: hidden; }
    .case-media img { width: 100%; height: 100%; object-fit: cover; }
    .case-body { padding: 22px; }
    .case-body p { margin-bottom: 0; }
    .review { padding: 23px; background: var(--white); border-left: 4px solid var(--yellow); border-radius: 12px; box-shadow: 0 7px 20px rgba(16,35,63,.05); }
    .stars { color: #e8a300; letter-spacing: 2px; margin-bottom: 12px; }
    .reviewer { margin-bottom: 0; font-size: 13px; font-weight: 800; color: var(--navy); }
    .compare-wrap { overflow-x: auto; background: var(--white); border: 1px solid var(--line); border-radius: 16px; }
    .compare { width: 100%; min-width: 720px; border-collapse: collapse; }
    .compare th, .compare td { text-align: left; padding: 17px 18px; border-bottom: 1px solid var(--line); }
    .compare th { color: var(--white); background: var(--navy); }
    .compare tr:last-child td { border-bottom: 0; }
    .compare td:first-child { font-weight: 800; }
    .compare .highlight { color: var(--coral); font-weight: 800; }
    .score { display: flex; align-items: center; gap: 25px; padding: 24px; margin-bottom: 22px; background: var(--lime); border-radius: 15px; }
    .score strong { font-size: 42px; line-height: 1; }
    .score p { margin: 0; font-weight: 800; }
    .price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .price { padding: 28px; background: var(--white); border: 1px solid var(--line); border-radius: 14px; }
    .price.featured { border: 2px solid var(--coral); transform: translateY(-7px); }
    .price strong { display: block; font-size: 32px; color: var(--navy); margin: 12px 0; }
    .price p { color: var(--muted); font-size: 14px; }
    .price ul { padding-left: 20px; color: var(--muted); font-size: 14px; }
    .timeline { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
    .timeline-item { padding: 22px; background: var(--white); border-bottom: 4px solid var(--cyan); border-radius: 12px; }
    .timeline-item b { color: var(--coral); font-size: 14px; }
    .article-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
    .article { padding: 18px; min-height: 130px; background: var(--white); border: 1px solid var(--line); border-radius: 12px; transition: transform .2s; }
    .article:hover { transform: translateY(-4px); }
    .article b { display: block; font-size: 15px; margin-bottom: 8px; }
    .article span { color: var(--muted); font-size: 12px; }
    .faq-list { max-width: 920px; }
    .faq-item { background: var(--white); border-bottom: 1px solid var(--line); }
    .faq-item summary { padding: 20px 22px; cursor: pointer; list-style: none; font-weight: 800; position: relative; padding-right: 50px; }
    .faq-item summary::-webkit-details-marker { display: none; }
    .faq-item summary::after { content: "+"; position: absolute; right: 22px; color: var(--coral); font-size: 24px; line-height: 1; }
    .faq-item[open] summary::after { content: "−"; }
    .faq-answer { padding: 0 22px 20px; }
    .contact-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 30px; align-items: start; }
    .contact-panel { padding: 30px; color: var(--white); background: var(--navy); border-radius: 18px; }
    .contact-panel p { color: #cbd7e7; }
    .contact-list { padding: 0; margin: 24px 0 0; list-style: none; }
    .contact-list li { padding: 11px 0; border-bottom: 1px solid rgba(255,255,255,.15); color: #dce6f2; }
    .contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; padding: 30px; background: var(--white); border: 1px solid var(--line); border-radius: 18px; }
    .field { display: grid; gap: 7px; }
    .field.full { grid-column: 1 / -1; }
    label { font-weight: 800; font-size: 14px; }
    input, select, textarea { width: 100%; border: 1px solid #ccd8e5; border-radius: 8px; padding: 12px 13px; color: var(--ink); background: #fbfdff; outline: none; }
    input:focus, select:focus, textarea:focus { border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(21,184,201,.14); }
    textarea { min-height: 130px; resize: vertical; }
    .join { display: flex; justify-content: space-between; align-items: center; gap: 25px; padding: 35px; color: var(--white); background: var(--coral); border-radius: 18px; }
    .join h2 { margin-bottom: 8px; }
    .join p { margin: 0; color: #fff1f1; }
    .join .btn { background: var(--white); color: var(--navy); }
    .footer { padding: 48px 0 22px; color: #d5e0ed; background: var(--navy); }
    .footer-grid { display: grid; grid-template-columns: 1.2fr .8fr 1fr; gap: 40px; }
    .footer h3 { color: var(--white); font-size: 16px; }
    .footer p { color: #aebed0; font-size: 14px; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 8px 17px; }
    .footer-links a { color: #d5e0ed; font-size: 13px; }
    .footer-links a:hover { color: var(--lime); }
    .footer-bottom { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; border-top: 1px solid rgba(255,255,255,.13); margin-top: 35px; padding-top: 18px; color: #93a6bb; font-size: 12px; }
    .float-actions { position: fixed; right: 20px; bottom: 22px; z-index: 15; display: grid; gap: 9px; }
    .float-actions a { width: 48px; height: 48px; display: grid; place-items: center; color: var(--navy); background: var(--lime); border-radius: 50%; box-shadow: 0 8px 20px rgba(16,35,63,.2); font-weight: 900; }
    .float-actions a:last-child { background: var(--white); border: 1px solid var(--line); }
    .reveal { opacity: 0; transform: translateY(18px); transition: opacity .65s ease, transform .65s ease; }
    .reveal.visible { opacity: 1; transform: none; }
    @media (max-width: 1050px) {
      .nav-links a { padding: 6px 5px; font-size: 12px; }
      .nav-cta { display: none; }
      .service-grid { grid-template-columns: repeat(3, 1fr); }
      .article-grid { grid-template-columns: repeat(3, 1fr); }
    }
    @media (max-width: 800px) {
      .container { width: min(100% - 30px, 680px); }
      .section { padding: 68px 0; }
      .nav-wrap { min-height: 66px; }
      .menu-toggle { display: block; }
      .nav-links { display: none; position: absolute; left: 15px; right: 15px; top: 66px; padding: 12px; background: var(--white); 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; }
      .hero { padding: 72px 0 60px; }
      .hero-grid, .intro-grid, .contact-grid { grid-template-columns: 1fr; gap: 34px; }
      .hero-panel { max-width: 500px; }
      .feature-grid, .case-grid, .review-grid, .price-grid { grid-template-columns: repeat(2, 1fr); }
      .workflow { grid-template-columns: 1fr; gap: 18px; }
      .step { padding: 0 0 0 60px; }
      .step:not(:last-child)::after { content: "↓"; left: 17px; right: auto; top: 42px; }
      .step-no { position: absolute; left: 0; top: 0; }
      .solution-grid, .timeline { grid-template-columns: 1fr 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .join { align-items: flex-start; flex-direction: column; }
    }
    @media (max-width: 520px) {
      h1 { font-size: 41px; }
      .hero-panel, .feature-grid, .service-grid, .case-grid, .review-grid, .price-grid, .solution-grid, .timeline, .article-grid, .footer-grid { grid-template-columns: 1fr; }
      .metric { min-height: 120px; }
      .contact-form { grid-template-columns: 1fr; padding: 20px; }
      .field.full { grid-column: auto; }
      .strip-inner { align-items: flex-start; flex-direction: column; gap: 5px; }
      .score { align-items: flex-start; flex-direction: column; gap: 10px; }
      .footer-bottom { flex-direction: column; gap: 5px; }
    }