:root {
      --ink: #18233b;
      --muted: #60708d;
      --paper: #f7f9fc;
      --white: #ffffff;
      --line: #dfe7f2;
      --blue: #2764ff;
      --cyan: #0ab8c7;
      --orange: #ff8b38;
      --pink: #f35b8c;
      --navy: #172849;
      --shadow: 0 18px 45px rgba(33, 62, 115, .11);
      --radius: 14px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "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(1180px, calc(100% - 40px)); margin: 0 auto; }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(255,255,255,.94);
      border-bottom: 1px solid rgba(223,231,242,.9);
      backdrop-filter: blur(16px);
    }
    .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; font-weight: 800; font-size: 19px; white-space: nowrap; }
    .ai-page-logo { width: 42px; }
    .nav-links { display: flex; align-items: center; gap: 0; flex-wrap: wrap; justify-content: flex-end; }
    .nav-links a { padding: 10px 11px; color: #445372; font-size: 13px; transition: color .2s, background .2s; }
    .nav-links a:hover { color: var(--blue); background: #eef4ff; }
    .nav-cta, .button-primary {
      display: inline-flex; align-items: center; justify-content: center; gap: 8px;
      border: 0; border-radius: 8px; padding: 12px 19px; color: #fff;
      background: linear-gradient(110deg, #2764ff, #0ab8c7);
      box-shadow: 0 10px 22px rgba(39,100,255,.2);
      font-weight: 700; cursor: pointer; transition: transform .2s, box-shadow .2s;
    }
    .nav-cta { margin-left: 10px; padding: 9px 14px; font-size: 13px; }
    .nav-cta:hover, .button-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 25px rgba(39,100,255,.28); }
    .menu-toggle { display: none; background: none; border: 1px solid var(--line); border-radius: 7px; padding: 8px 10px; font-size: 20px; color: var(--ink); }
    .hero {
      position: relative; overflow: hidden; background:
        linear-gradient(125deg, #eef5ff 0%, #fff 46%, #fff5e9 100%);
      padding: 86px 0 68px;
    }
    .hero:before, .hero:after { content: ""; position: absolute; border-radius: 50%; pointer-events: none; }
    .hero:before { width: 400px; height: 400px; right: -150px; top: -150px; background: rgba(255,139,56,.15); }
    .hero:after { width: 280px; height: 280px; left: -130px; bottom: -160px; background: rgba(10,184,199,.14); }
    .hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: 1.1fr .9fr; gap: 58px; align-items: center; }
    .eyebrow { color: var(--blue); font-size: 13px; font-weight: 800; letter-spacing: 2px; }
    h1 { font-size: clamp(38px, 5vw, 68px); line-height: 1.12; margin: 15px 0 22px; letter-spacing: 0; max-width: 680px; }
    .hero-copy { max-width: 650px; color: var(--muted); font-size: 18px; }
    .hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 30px; }
    .button-secondary { display: inline-flex; align-items: center; justify-content: center; border: 1px solid #b9c9e4; border-radius: 8px; padding: 11px 18px; color: var(--blue); font-weight: 700; background: #fff; }
    .hero-board { display: grid; grid-template-columns: repeat(2,1fr); gap: 12px; }
    .signal { background: rgba(255,255,255,.82); border: 1px solid rgba(255,255,255,.95); border-radius: 14px; padding: 22px; box-shadow: var(--shadow); animation: floatIn .7s both; }
    .signal:nth-child(2) { margin-top: 22px; animation-delay: .12s; }
    .signal:nth-child(3) { animation-delay: .22s; }
    .signal:nth-child(4) { margin-top: 22px; animation-delay: .32s; }
    .signal strong { display: block; font-size: 27px; color: var(--navy); }
    .signal span { color: var(--muted); font-size: 13px; }
    @keyframes floatIn { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
    section { padding: 82px 0; }
    .section-head { max-width: 700px; margin-bottom: 35px; }
    .section-head h2 { margin: 8px 0 12px; font-size: clamp(28px, 4vw, 43px); line-height: 1.2; }
    .section-head p { color: var(--muted); margin: 0; }
    .stats { background: #fff; padding: 25px 0; border-bottom: 1px solid var(--line); }
    .stats-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 18px; }
    .stat { padding: 14px 22px; border-left: 3px solid var(--blue); }
    .stat strong { display: block; font-size: 30px; color: var(--navy); }
    .stat span { color: var(--muted); font-size: 14px; }
    .about-grid { display: grid; grid-template-columns: .92fr 1.08fr; gap: 42px; align-items: start; }
    .about-image { overflow: hidden; border-radius: var(--radius); box-shadow: var(--shadow); background: #eaf1fb; }
    .about-image img { width: 100%; }
    .feature-list { display: grid; grid-template-columns: repeat(2,1fr); gap: 14px; margin-top: 24px; }
    .feature { padding: 19px; background: #fff; border: 1px solid var(--line); border-radius: 10px; }
    .feature b { display: block; margin-bottom: 5px; color: var(--navy); }
    .feature span { font-size: 14px; color: var(--muted); }
    .service-section { background: linear-gradient(140deg, #f1f6ff, #f7fbfa 55%, #fff4ef); }
    .service-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 16px; }
    .service-card { background: #fff; padding: 23px; border: 1px solid var(--line); border-radius: 12px; transition: transform .2s, box-shadow .2s; }
    .service-card:hover, .quote:hover, .case:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
    .service-card .num { color: var(--pink); font-weight: 800; font-size: 13px; }
    .service-card h3 { margin: 8px 0 8px; font-size: 19px; }
    .service-card p { color: var(--muted); font-size: 14px; margin: 0; }
    .process { display: grid; grid-template-columns: repeat(5,1fr); gap: 0; position: relative; }
    .process:before { content: ""; position: absolute; left: 8%; right: 8%; top: 27px; border-top: 2px dashed #b9c9e4; }
    .step { position: relative; z-index: 1; text-align: center; padding: 0 10px; }
    .step i { display: grid; place-items: center; width: 55px; height: 55px; margin: 0 auto 17px; border-radius: 50%; background: var(--blue); color: #fff; font-style: normal; font-weight: 800; box-shadow: 0 7px 15px rgba(39,100,255,.2); }
    .step h3 { font-size: 17px; margin: 0 0 5px; }
    .step p { font-size: 13px; color: var(--muted); margin: 0; }
    .split { display: grid; grid-template-columns: 1fr 1fr; gap: 25px; }
    .panel { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 28px; }
    .panel h3 { margin-top: 0; font-size: 23px; }
    .check-list { padding: 0; list-style: none; margin: 0; }
    .check-list li { padding: 12px 0 12px 27px; border-bottom: 1px solid #edf1f6; position: relative; color: #465572; }
    .check-list li:before { content: "✓"; position: absolute; left: 0; color: var(--cyan); font-weight: 800; }
    .table-wrap { overflow-x: auto; background: #fff; border: 1px solid var(--line); border-radius: 12px; }
    table { width: 100%; min-width: 760px; border-collapse: collapse; }
    th, td { padding: 16px 18px; text-align: left; border-bottom: 1px solid var(--line); }
    th { background: #edf4ff; color: var(--navy); }
    td { color: #52617c; }
    tr:last-child td { border-bottom: 0; }
    .rating { display: flex; gap: 4px; color: #ff9a28; font-size: 24px; }
    .score { font-size: 43px; font-weight: 800; color: var(--blue); line-height: 1; }
    .score small { font-size: 15px; color: var(--muted); font-weight: 500; }
    .tag-cloud { display: flex; gap: 10px; flex-wrap: wrap; }
    .tag { border: 1px solid #bcd0ee; color: #3561a7; background: #f5f9ff; padding: 8px 13px; border-radius: 5px; font-size: 14px; }
    .cases { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
    .case { background: #fff; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; transition: transform .2s, box-shadow .2s; }
    .case-media { aspect-ratio: 16 / 8; overflow: hidden; background: #e9eef7; }
    .case-media img { width: 100%; height: 100%; object-fit: cover; }
    .case-body { padding: 20px; }
    .case-body h3 { margin: 0 0 6px; }
    .case-body p { color: var(--muted); margin: 0; font-size: 14px; }
    .quotes { display: grid; grid-template-columns: repeat(3,1fr); gap: 16px; }
    .quote { background: #fff; border-left: 4px solid var(--orange); padding: 22px; border-radius: 8px; transition: transform .2s, box-shadow .2s; }
    .quote p { margin: 0 0 15px; color: #465572; font-size: 15px; }
    .quote b { font-size: 14px; color: var(--navy); }
    .quote span { display: block; color: var(--muted); font-size: 12px; }
    .article-grid { display: grid; grid-template-columns: repeat(5,1fr); gap: 13px; }
    .article { background: #fff; padding: 18px; border: 1px solid var(--line); border-radius: 8px; font-weight: 700; font-size: 14px; }
    .article span { display: block; color: var(--blue); font-size: 12px; margin-top: 13px; }
    .faq-list { max-width: 900px; }
    details { background: #fff; border: 1px solid var(--line); border-radius: 8px; margin-bottom: 10px; padding: 0 20px; }
    summary { cursor: pointer; list-style: none; padding: 17px 25px 17px 0; font-weight: 700; position: relative; }
    summary::-webkit-details-marker { display: none; }
    summary:after { content: "+"; position: absolute; right: 0; color: var(--blue); font-size: 22px; }
    details[open] summary:after { content: "−"; }
    details p { color: var(--muted); margin: 0 0 18px; font-size: 14px; }
    .contact-section { background: var(--navy); color: #fff; }
    .contact-section .section-head p { color: #bfcae0; }
    .contact-grid { display: grid; grid-template-columns: .85fr 1.15fr; gap: 42px; align-items: start; }
    .contact-info { display: grid; gap: 15px; }
    .contact-item { padding: 17px 0; border-bottom: 1px solid rgba(255,255,255,.16); }
    .contact-item b { display: block; color: #fff; }
    .contact-item span { color: #c1cde3; font-size: 14px; }
    .form-box { background: #fff; color: var(--ink); border-radius: 12px; padding: 27px; }
    .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
    label { display: grid; gap: 6px; color: #4e5d78; font-size: 13px; font-weight: 700; }
    input, select, textarea { width: 100%; border: 1px solid #d4deec; border-radius: 6px; padding: 12px; font: inherit; color: var(--ink); background: #fbfcfe; }
    textarea { min-height: 120px; resize: vertical; }
    .full { grid-column: 1 / -1; }
    .form-box .button-primary { margin-top: 16px; }
    .footer { background: #101b32; color: #d4deee; padding: 42px 0 22px; }
    .footer-grid { display: grid; grid-template-columns: 1.3fr .8fr .8fr 1fr; gap: 30px; }
    .footer h3 { color: #fff; margin: 0 0 13px; font-size: 16px; }
    .footer p, .footer a { color: #aebbd2; font-size: 13px; }
    .footer a { display: block; margin: 7px 0; }
    .footer a:hover { color: #fff; }
    .footer-bottom { border-top: 1px solid rgba(255,255,255,.13); margin-top: 28px; padding-top: 18px; color: #91a0ba; font-size: 12px; display: flex; justify-content: space-between; gap: 15px; flex-wrap: wrap; }
    .float-tools { position: fixed; right: 18px; bottom: 20px; z-index: 15; display: grid; gap: 8px; }
    .float-tools a, .top-btn { border: 0; border-radius: 50%; width: 45px; height: 45px; display: grid; place-items: center; background: var(--blue); color: #fff; box-shadow: 0 8px 18px rgba(23,40,73,.2); cursor: pointer; font-size: 13px; }
    .reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s, transform .7s; }
    .reveal.visible { opacity: 1; transform: translateY(0); }
    @media (max-width: 1000px) {
      .nav-links a { padding-inline: 7px; }
      .service-grid { grid-template-columns: repeat(3,1fr); }
      .article-grid { grid-template-columns: repeat(3,1fr); }
    }
    @media (max-width: 760px) {
      .container { width: min(100% - 28px, 620px); }
      .nav-wrap { min-height: 66px; }
      .menu-toggle { display: block; }
      .nav-links { display: none; position: absolute; left: 14px; right: 14px; top: 68px; padding: 10px; background: #fff; border: 1px solid var(--line); border-radius: 10px; box-shadow: var(--shadow); }
      .nav-links.open { display: grid; }
      .nav-links a { padding: 10px 12px; }
      .nav-cta { display: none; }
      .hero { padding: 60px 0 50px; }
      .hero-grid, .about-grid, .split, .contact-grid { grid-template-columns: 1fr; gap: 28px; }
      .hero-board { max-width: 500px; }
      section { padding: 60px 0; }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
      .service-grid, .cases, .quotes { grid-template-columns: repeat(2,1fr); }
      .process { grid-template-columns: 1fr; gap: 24px; }
      .process:before { left: 50%; top: 28px; bottom: 28px; right: auto; border-top: 0; border-left: 2px dashed #b9c9e4; }
      .step { display: grid; grid-template-columns: 55px 1fr; column-gap: 16px; text-align: left; align-items: center; }
      .step i { grid-row: span 2; margin: 0; }
      .step p { margin-bottom: 0; }
      .article-grid { grid-template-columns: repeat(2,1fr); }
      .footer-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 480px) {
      h1 { font-size: 38px; }
      .hero-copy { font-size: 16px; }
      .hero-board, .feature-list, .service-grid, .cases, .quotes, .form-grid { grid-template-columns: 1fr; }
      .signal:nth-child(2), .signal:nth-child(4) { margin-top: 0; }
      .full { grid-column: auto; }
      .footer-grid { grid-template-columns: 1fr; }
    }