:root {
      --ink: #17213c;
      --muted: #65708b;
      --line: #dce3f2;
      --paper: #f7f9fd;
      --white: #ffffff;
      --navy: #101936;
      --blue: #3059d8;
      --cyan: #14b8c4;
      --violet: #7059d8;
      --pink: #e85c9d;
      --lime: #c7e66c;
      --shadow: 0 18px 50px rgba(38, 57, 111, .10);
      --container: min(1180px, calc(100% - 36px));
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background:
        linear-gradient(180deg, #f8faff 0%, #f4f7fc 55%, #eef3fb 100%);
      font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
      line-height: 1.7;
    }
    a { color: inherit; text-decoration: none; }
    img { max-width: 100%; height: auto; display: block; }
    .container { width: var(--container); margin: 0 auto; }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(248, 250, 255, .94);
      border-bottom: 1px solid rgba(220, 227, 242, .9);
      backdrop-filter: blur(16px);
    }
    .nav {
      min-height: 76px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 22px;
    }
    .brand { display: flex; align-items: center; gap: 11px; flex: 0 0 auto; }
    .ai-page-logo { width: 42px; max-height: 42px; object-fit: contain; }
    .brand strong { font-size: 18px; letter-spacing: .04em; }
    .brand small { display: block; color: var(--muted); font-size: 11px; line-height: 1.2; }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      flex-wrap: wrap;
      justify-content: flex-end;
    }
    .nav-links a {
      padding: 7px 9px;
      color: #48536f;
      font-size: 13px;
      transition: color .2s ease, background .2s ease;
      border-radius: 7px;
    }
    .nav-links a:hover { color: var(--blue); background: #e9efff; }
    .nav-cta, .button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border: 0;
      border-radius: 7px;
      padding: 12px 18px;
      color: #fff;
      background: linear-gradient(100deg, var(--blue), var(--violet));
      font-weight: 700;
      cursor: pointer;
      box-shadow: 0 8px 18px rgba(48, 89, 216, .2);
      transition: transform .2s ease, box-shadow .2s ease;
    }
    .nav-cta { padding: 9px 14px; margin-left: 10px; font-size: 13px; }
    .button:hover, .nav-cta:hover { transform: translateY(-2px); box-shadow: 0 12px 24px rgba(48, 89, 216, .28); }
    .button.secondary { color: var(--ink); background: #fff; border: 1px solid var(--line); box-shadow: none; }
    .menu-toggle { display: none; border: 1px solid var(--line); background: #fff; border-radius: 7px; padding: 8px 10px; font-size: 20px; color: var(--ink); }
    .hero {
      position: relative;
      overflow: hidden;
      padding: 95px 0 78px;
      background:
        linear-gradient(118deg, rgba(16,25,54,.98), rgba(33,48,98,.96) 58%, rgba(74,54,137,.94));
      color: #fff;
    }
    .hero:before, .hero:after {
      content: "";
      position: absolute;
      border: 1px solid rgba(199,230,108,.32);
      transform: rotate(24deg);
      pointer-events: none;
    }
    .hero:before { width: 360px; height: 360px; right: 6%; top: -150px; border-radius: 38%; box-shadow: 0 0 0 18px rgba(20,184,196,.08), 0 0 0 38px rgba(232,92,157,.06); }
    .hero:after { width: 210px; height: 210px; left: 4%; bottom: -120px; border-color: rgba(112,89,216,.7); border-radius: 50%; }
    .hero-grid { position: relative; z-index: 1; display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(300px, .9fr); gap: 60px; align-items: center; }
    .eyebrow { color: var(--lime); font-size: 13px; letter-spacing: .16em; text-transform: uppercase; font-weight: 800; }
    h1, h2, h3, p { margin-top: 0; }
    h1 { max-width: 690px; margin-bottom: 22px; font-size: clamp(38px, 6vw, 72px); line-height: 1.1; letter-spacing: 0; }
    .hero-copy { max-width: 650px; color: #d9e1fa; font-size: 18px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
    .hero .button.secondary { color: #fff; background: transparent; border-color: rgba(255,255,255,.34); }
    .signal-board {
      border-left: 1px solid rgba(255,255,255,.28);
      padding-left: 28px;
      animation: floatBoard 5s ease-in-out infinite;
    }
    .signal-board h2 { font-size: 23px; margin-bottom: 20px; }
    .signal-row { display: flex; justify-content: space-between; gap: 20px; padding: 14px 0; border-bottom: 1px solid rgba(255,255,255,.16); color: #d9e1fa; }
    .signal-row strong { color: var(--lime); font-size: 22px; }
    @keyframes floatBoard { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-7px); } }
    .section { padding: 82px 0; }
    .section.alt { background: rgba(255,255,255,.52); border-top: 1px solid rgba(220,227,242,.7); border-bottom: 1px solid rgba(220,227,242,.7); }
    .section-head { display: flex; justify-content: space-between; align-items: end; gap: 30px; margin-bottom: 34px; }
    .section-head > div { max-width: 700px; }
    .section-kicker { margin-bottom: 8px; color: var(--blue); font-size: 13px; font-weight: 800; letter-spacing: .12em; }
    h2 { font-size: clamp(28px, 4vw, 46px); line-height: 1.18; letter-spacing: 0; margin-bottom: 13px; }
    h3 { font-size: 19px; line-height: 1.35; margin-bottom: 9px; }
    .lead, .muted { color: var(--muted); }
    .metric-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: -28px; position: relative; z-index: 2; }
    .metric { padding: 24px; background: #fff; border: 1px solid var(--line); border-top: 3px solid var(--cyan); box-shadow: var(--shadow); }
    .metric strong { display: block; font-size: 34px; line-height: 1.15; color: var(--navy); }
    .metric span { color: var(--muted); font-size: 14px; }
    .intro-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 48px; align-items: start; }
    .accent-line { width: 80px; height: 5px; background: linear-gradient(90deg, var(--pink), var(--cyan)); margin: 22px 0; }
    .service-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .service-card, .review, .article, .case-card, .network-card { background: #fff; border: 1px solid var(--line); padding: 24px; box-shadow: 0 8px 25px rgba(38,57,111,.05); transition: transform .22s ease, box-shadow .22s ease; }
    .service-card:hover, .review:hover, .case-card:hover, .article:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
    .service-card .index { color: var(--pink); font-size: 12px; font-weight: 800; letter-spacing: .12em; }
    .service-card p, .review p, .article p, .case-card p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .tag-list { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 20px; }
    .tag { padding: 7px 12px; border: 1px solid #cbd7f3; background: #f5f7ff; color: #3b4d84; border-radius: 5px; font-size: 13px; }
    .process { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; }
    .step { position: relative; padding: 24px 18px; border-top: 2px solid var(--blue); }
    .step:not(:last-child):after { content: "→"; position: absolute; right: -8px; top: 18px; color: var(--pink); font-size: 21px; }
    .step-number { color: var(--blue); font-size: 13px; font-weight: 800; }
    .case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .case-media { aspect-ratio: 16 / 9; background: #e9eef9; overflow: hidden; margin: -24px -24px 20px; }
    .case-media img { width: 100%; height: 100%; object-fit: cover; }
    .case-media.square { aspect-ratio: 1 / 1; }
    .compare-wrap { overflow-x: auto; background: #fff; border: 1px solid var(--line); }
    table { width: 100%; border-collapse: collapse; min-width: 760px; }
    th, td { padding: 16px 18px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
    th { background: var(--navy); color: #fff; font-weight: 700; }
    td:first-child { font-weight: 700; color: var(--navy); }
    .rating { display: flex; align-items: center; gap: 20px; padding: 22px; background: linear-gradient(100deg, #eef2ff, #f9f3fb); border: 1px solid #d4dcf5; margin-bottom: 18px; }
    .rating strong { font-size: 40px; color: var(--violet); line-height: 1; }
    .stars { color: #e69a25; letter-spacing: 3px; font-size: 20px; }
    .network-grid, .review-grid, .article-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .network-card strong { display: block; color: var(--blue); font-size: 26px; margin-bottom: 5px; }
    .review { border-top: 3px solid var(--pink); }
    .review cite { display: block; margin-top: 15px; color: var(--ink); font-style: normal; font-weight: 700; font-size: 14px; }
    .review cite span { color: var(--muted); font-weight: 400; margin-left: 6px; }
    .faq-list { max-width: 900px; margin: 0 auto; }
    details { background: #fff; border: 1px solid var(--line); margin-bottom: 10px; }
    summary { cursor: pointer; padding: 18px 22px; font-weight: 700; list-style: none; display: flex; justify-content: space-between; gap: 20px; }
    summary:after { content: "+"; color: var(--blue); font-size: 22px; line-height: 1; }
    details[open] summary:after { content: "−"; }
    details p { padding: 0 22px 20px; margin-bottom: 0; color: var(--muted); }
    .form-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 44px; align-items: start; }
    .form-box { background: #fff; border: 1px solid var(--line); padding: 28px; box-shadow: var(--shadow); }
    .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
    label { display: block; color: var(--ink); font-size: 14px; font-weight: 700; }
    input, select, textarea { width: 100%; margin-top: 6px; padding: 12px 13px; border: 1px solid #cbd5e8; border-radius: 5px; color: var(--ink); background: #fbfcff; font: inherit; }
    textarea { min-height: 130px; resize: vertical; }
    .full { grid-column: 1 / -1; }
    .contact-list { display: grid; gap: 13px; margin-top: 24px; }
    .contact-item { padding: 14px 0; border-bottom: 1px solid var(--line); }
    .contact-item strong { display: block; }
    .contact-item span { color: var(--muted); font-size: 14px; }
    .qr { width: 130px; margin-top: 15px; border: 6px solid #fff; box-shadow: 0 5px 20px rgba(0,0,0,.12); }
    .article a { color: var(--blue); font-weight: 700; }
    .footer { padding: 48px 0 24px; background: var(--navy); color: #dce4fb; }
    .footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 40px; }
    .footer h3 { color: #fff; }
    .footer p, .footer a { color: #b8c4e2; font-size: 14px; }
    .footer a:hover { color: var(--lime); }
    .footer-links { display: flex; flex-wrap: wrap; gap: 10px 18px; }
    .copyright { border-top: 1px solid rgba(255,255,255,.15); margin-top: 32px; padding-top: 18px; color: #91a0c3; font-size: 13px; }
    .floating { position: fixed; right: 18px; bottom: 18px; z-index: 12; display: grid; gap: 8px; }
    .floating a { display: inline-flex; align-items: center; gap: 7px; padding: 11px 14px; color: #fff; background: var(--navy); border: 1px solid rgba(255,255,255,.2); border-radius: 6px; box-shadow: 0 8px 22px rgba(16,25,54,.25); font-size: 13px; }
    .reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
    .reveal.visible { opacity: 1; transform: none; }
    @media (max-width: 980px) {
      .nav-links a { padding-left: 6px; padding-right: 6px; }
      .hero-grid, .intro-grid, .form-layout { grid-template-columns: 1fr; gap: 34px; }
      .signal-board { border-left: 0; border-top: 1px solid rgba(255,255,255,.28); padding: 24px 0 0; }
      .service-grid, .case-grid, .network-grid, .review-grid, .article-grid { grid-template-columns: repeat(2, 1fr); }
      .process { grid-template-columns: repeat(3, 1fr); }
      .step:not(:last-child):after { display: none; }
    }
    @media (max-width: 680px) {
      :root { --container: min(100% - 28px, 560px); }
      .site-header { position: relative; }
      .nav { min-height: 68px; }
      .menu-toggle { display: block; }
      .nav-links { display: none; position: absolute; top: 68px; left: 0; right: 0; padding: 10px 14px 16px; background: #f8faff; border-bottom: 1px solid var(--line); box-shadow: var(--shadow); }
      .nav-links.open { display: grid; grid-template-columns: 1fr 1fr; }
      .nav-links a { padding: 10px; }
      .nav-cta { grid-column: 1 / -1; margin: 6px 0 0; }
      .hero { padding: 65px 0 58px; }
      h1 { font-size: 42px; }
      .metric-grid, .service-grid, .case-grid, .network-grid, .review-grid, .article-grid, .process { grid-template-columns: 1fr; }
      .metric-grid { margin-top: 0; padding-top: 14px; }
      .section { padding: 58px 0; }
      .section-head { display: block; }
      .form-grid { grid-template-columns: 1fr; }
      .full { grid-column: auto; }
      .footer-grid { grid-template-columns: 1fr; gap: 24px; }
      .floating { right: 10px; bottom: 10px; }
      .floating a { padding: 9px 11px; font-size: 12px; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *:before, *:after { scroll-behavior: auto !important; animation: none !important; transition: none !important; }
      .reveal { opacity: 1; transform: none; }
    }