:root {
      --ink: #18213d;
      --muted: #65708c;
      --navy: #10162f;
      --blue: #496cff;
      --cyan: #18d8d2;
      --pink: #ff4f9a;
      --yellow: #ffd166;
      --paper: #f7f9ff;
      --line: #dfe5f4;
      --white: #fff;
      --shadow: 0 18px 45px rgba(30, 50, 110, .12);
      --radius: 16px;
    }
    * { 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; }
    .container { width: min(1180px, calc(100% - 40px)); margin: 0 auto; }
    .topbar {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(16, 22, 47, .94);
      border-bottom: 1px solid rgba(255,255,255,.12);
      backdrop-filter: blur(14px);
    }
    .nav {
      min-height: 76px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 22px;
    }
    .brand { display: flex; align-items: center; flex: 0 0 auto; }
    .ai-page-logo { width: 142px; }
    .nav-links {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 0;
      flex-wrap: wrap;
    }
    .nav-links a {
      color: #e8edff;
      font-size: 13px;
      padding: 8px 10px;
      transition: color .2s ease;
    }
    .nav-links a:hover, .nav-links a.active { color: var(--cyan); }
    .nav-cta {
      color: var(--navy) !important;
      background: var(--yellow);
      border-radius: 7px;
      font-weight: 700;
      margin-left: 10px;
    }
    .menu-toggle {
      display: none;
      color: #fff;
      border: 1px solid rgba(255,255,255,.3);
      background: transparent;
      padding: 8px 11px;
      border-radius: 7px;
      font-size: 18px;
    }
    .hero {
      position: relative;
      overflow: hidden;
      color: #fff;
      background:
        linear-gradient(135deg, #10162f 0%, #18255d 48%, #253a8d 100%);
      padding: 86px 0 74px;
    }
    .hero:before, .hero:after {
      content: "";
      position: absolute;
      border: 1px solid rgba(24,216,210,.3);
      transform: rotate(35deg);
      pointer-events: none;
    }
    .hero:before { width: 370px; height: 370px; right: -130px; top: -160px; }
    .hero:after { width: 250px; height: 250px; left: -150px; bottom: -160px; border-color: rgba(255,79,154,.35); }
    .hero-grid {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: minmax(0, 1.2fr) minmax(300px, .8fr);
      align-items: center;
      gap: 54px;
    }
    .eyebrow, .section-kicker {
      color: var(--cyan);
      letter-spacing: .14em;
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
    }
    h1, h2, h3, p { margin-top: 0; }
    h1 {
      max-width: 720px;
      font-size: clamp(36px, 6vw, 70px);
      line-height: 1.12;
      margin-bottom: 22px;
      letter-spacing: 0;
    }
    .hero-copy {
      max-width: 650px;
      color: #d8e1ff;
      font-size: 18px;
      margin-bottom: 30px;
    }
    .actions { display: flex; gap: 12px; flex-wrap: wrap; }
    .button {
      display: inline-flex;
      justify-content: center;
      align-items: center;
      min-height: 46px;
      padding: 11px 20px;
      border: 1px solid transparent;
      border-radius: 8px;
      font-weight: 700;
      cursor: pointer;
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    }
    .button:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(15,25,65,.2); }
    .button-primary { background: var(--yellow); color: var(--navy); }
    .button-outline { border-color: rgba(255,255,255,.45); color: #fff; background: rgba(255,255,255,.06); }
    .hero-panel {
      border-left: 2px solid var(--pink);
      padding: 6px 0 6px 28px;
    }
    .hero-panel strong { display: block; font-size: 47px; line-height: 1.1; color: #fff; }
    .hero-panel p { color: #bfcaff; margin: 8px 0 24px; }
    .signal {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 10px;
    }
    .signal div {
      padding: 13px;
      border: 1px solid rgba(255,255,255,.2);
      background: rgba(255,255,255,.08);
      border-radius: 9px;
    }
    .signal b { display: block; color: var(--cyan); font-size: 19px; }
    .section { padding: 84px 0; }
    .section-alt { background: #eef3ff; }
    .section-head {
      display: flex;
      align-items: end;
      justify-content: space-between;
      gap: 28px;
      margin-bottom: 34px;
    }
    .section-head h2 { font-size: clamp(28px, 4vw, 44px); line-height: 1.2; margin: 7px 0 0; }
    .section-head p { max-width: 510px; color: var(--muted); margin-bottom: 0; }
    .stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 14px;
      margin-top: -28px;
      position: relative;
      z-index: 2;
    }
    .stat {
      background: #fff;
      padding: 22px;
      border-bottom: 3px solid var(--cyan);
      box-shadow: var(--shadow);
    }
    .stat:nth-child(2) { border-color: var(--pink); }
    .stat:nth-child(3) { border-color: var(--yellow); }
    .stat:nth-child(4) { border-color: var(--blue); }
    .stat strong { display: block; font-size: 31px; color: var(--navy); }
    .stat span { color: var(--muted); font-size: 14px; }
    .about-grid, .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 46px;
      align-items: start;
    }
    .lead { font-size: 19px; color: #303b5c; }
    .check-list { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 13px; }
    .check-list li { padding-left: 28px; position: relative; }
    .check-list li:before { content: "✦"; position: absolute; left: 0; color: var(--pink); font-weight: 700; }
    .feature-grid, .solution-grid, .review-grid, .article-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 18px;
    }
    .feature, .solution, .review, .article-card {
      background: #fff;
      border: 1px solid var(--line);
      padding: 24px;
      transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
    }
    .feature:hover, .solution:hover, .review:hover, .article-card:hover {
      transform: translateY(-5px);
      border-color: #a9baff;
      box-shadow: var(--shadow);
    }
    .feature-mark {
      width: 40px; height: 40px; display: grid; place-items: center;
      background: var(--navy); color: var(--cyan); border-radius: 10px;
      font-weight: 700; margin-bottom: 20px;
    }
    .feature h3, .solution h3, .review h3, .article-card h3 { margin-bottom: 8px; font-size: 19px; }
    .feature p, .solution p, .review p, .article-card p { margin-bottom: 0; color: var(--muted); font-size: 14px; }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 10px; }
    .tag {
      padding: 7px 13px;
      border: 1px solid #b9c7f3;
      color: #3e54a6;
      background: #f4f6ff;
      border-radius: 5px;
      font-size: 13px;
    }
    .process {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 0;
      counter-reset: step;
    }
    .process-item { position: relative; padding: 18px 18px 10px 0; }
    .process-item:not(:last-child):after {
      content: "";
      height: 1px;
      background: #b6c2e7;
      position: absolute;
      top: 29px;
      left: 47px;
      right: 0;
    }
    .step-number {
      position: relative;
      z-index: 1;
      width: 38px; height: 38px; display: grid; place-items: center;
      border-radius: 50%; background: var(--pink); color: #fff; font-weight: 700;
      margin-bottom: 18px;
    }
    .process-item:nth-child(even) .step-number { background: var(--blue); }
    .process-item h3 { font-size: 16px; margin-bottom: 7px; }
    .process-item p { color: var(--muted); font-size: 13px; margin: 0; }
    .solution-grid { grid-template-columns: repeat(4, 1fr); }
    .solution { border-top: 3px solid var(--cyan); }
    .solution:nth-child(2n) { border-color: var(--pink); }
    .solution:nth-child(3n) { border-color: var(--yellow); }
    .solution small { color: var(--blue); font-weight: 700; }
    .network {
      background: var(--navy);
      color: #fff;
    }
    .network .section-head p { color: #bfcaff; }
    .network .tag { color: #dce5ff; background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.22); }
    .network-list { display: flex; flex-wrap: wrap; gap: 11px; }
    .network-list span { padding: 9px 13px; border-left: 3px solid var(--cyan); background: rgba(255,255,255,.07); font-size: 14px; }
    .timeline { border-left: 2px solid #b6c2e7; padding-left: 26px; display: grid; gap: 25px; }
    .timeline-item { position: relative; }
    .timeline-item:before { content: ""; position: absolute; left: -35px; top: 8px; width: 14px; height: 14px; background: var(--pink); border: 3px solid var(--paper); border-radius: 50%; }
    .timeline-item h3 { margin-bottom: 5px; font-size: 18px; }
    .timeline-item p { color: var(--muted); margin-bottom: 0; }
    .case-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 20px; }
    .case-card { background: #fff; border: 1px solid var(--line); overflow: hidden; }
    .case-card img { width: 100%; aspect-ratio: 16 / 8; object-fit: cover; }
    .case-body { padding: 22px; }
    .case-body h3 { margin-bottom: 8px; }
    .case-body p { color: var(--muted); margin-bottom: 0; }
    .case-side { display: grid; gap: 20px; }
    .case-side .case-card img { aspect-ratio: 1.3 / 1; }
    .score {
      display: grid;
      grid-template-columns: .85fr 1.15fr;
      gap: 30px;
      align-items: center;
      background: var(--navy);
      color: #fff;
      padding: 32px;
      margin-bottom: 24px;
    }
    .score-number { font-size: 64px; color: var(--yellow); line-height: 1; font-weight: 800; }
    .stars { color: var(--yellow); letter-spacing: 4px; font-size: 24px; }
    .table-wrap { overflow-x: auto; background: #fff; border: 1px solid var(--line); }
    table { width: 100%; border-collapse: collapse; min-width: 720px; }
    th, td { text-align: left; padding: 15px 17px; border-bottom: 1px solid var(--line); }
    th { background: #edf1ff; color: var(--navy); }
    td:first-child { font-weight: 700; }
    .good { color: #0e968f; font-weight: 700; }
    .price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .price {
      background: #fff;
      border: 1px solid var(--line);
      padding: 26px;
      position: relative;
    }
    .price.featured { border: 2px solid var(--pink); transform: translateY(-8px); }
    .price-label { color: var(--blue); font-weight: 700; }
    .price strong { display: block; font-size: 28px; margin: 13px 0; }
    .price p { color: var(--muted); font-size: 14px; }
    .faq-list { display: grid; gap: 10px; max-width: 900px; }
    details { background: #fff; border: 1px solid var(--line); }
    summary { cursor: pointer; list-style: none; padding: 17px 20px; font-weight: 700; position: relative; padding-right: 48px; }
    summary::-webkit-details-marker { display: none; }
    summary:after { content: "+"; position: absolute; right: 20px; color: var(--pink); font-size: 22px; }
    details[open] summary:after { content: "−"; }
    details p { padding: 0 20px 18px; margin: 0; color: var(--muted); font-size: 14px; }
    .review-grid { grid-template-columns: repeat(3, 1fr); }
    .review-top { display: flex; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
    .review-top strong { font-size: 15px; }
    .review-top span { color: var(--pink); font-size: 13px; }
    .article-card a { display: inline-block; color: var(--blue); font-size: 13px; margin-top: 16px; font-weight: 700; }
    .form-panel { background: #fff; border: 1px solid var(--line); padding: 28px; }
    .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
    label { display: grid; gap: 7px; color: #45516f; font-size: 14px; font-weight: 700; }
    input, select, textarea {
      width: 100%; border: 1px solid #cdd6ec; border-radius: 6px; padding: 12px 13px;
      font: inherit; color: var(--ink); background: #fbfcff; outline: none;
    }
    input:focus, select:focus, textarea:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(73,108,255,.12); }
    textarea { min-height: 125px; resize: vertical; }
    .full { grid-column: 1 / -1; }
    .contact-note { padding: 28px; background: var(--navy); color: #fff; }
    .contact-note h3 { font-size: 26px; margin-bottom: 16px; }
    .contact-note p { color: #c6d0f3; }
    .contact-info { display: grid; gap: 13px; margin-top: 24px; }
    .qr { width: 150px; margin-top: 22px; border: 6px solid #fff; }
    .footer {
      background: #0b1025;
      color: #c5cdec;
      padding: 42px 0 25px;
    }
    .footer-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 34px; }
    .footer h3 { color: #fff; font-size: 16px; margin-bottom: 13px; }
    .footer p, .footer a { font-size: 13px; color: #aeb9df; }
    .footer a { display: block; margin: 7px 0; }
    .footer a:hover { color: var(--cyan); }
    .copyright { border-top: 1px solid rgba(255,255,255,.12); margin-top: 30px; padding-top: 18px; font-size: 12px; color: #8994b7; }
    .float-tools { position: fixed; right: 18px; bottom: 20px; z-index: 15; display: grid; gap: 8px; }
    .float-tools a { width: 46px; height: 46px; display: grid; place-items: center; border-radius: 50%; background: var(--pink); color: #fff; font-weight: 700; box-shadow: 0 8px 22px rgba(255,79,154,.3); }
    .float-tools a:last-child { background: var(--blue); }
    .reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s ease; }
    .reveal.visible { opacity: 1; transform: none; }
    @media (max-width: 980px) {
      .nav-links { display: none; position: absolute; top: 76px; left: 0; right: 0; padding: 15px 20px 20px; background: var(--navy); border-top: 1px solid rgba(255,255,255,.1); }
      .nav-links.open { display: grid; }
      .nav-links a { padding: 11px 0; }
      .nav-cta { margin: 8px 0 0; text-align: center; }
      .menu-toggle { display: block; }
      .hero-grid, .about-grid, .contact-grid, .case-grid { grid-template-columns: 1fr; }
      .stats { grid-template-columns: repeat(2, 1fr); }
      .solution-grid { grid-template-columns: repeat(2, 1fr); }
      .process { grid-template-columns: repeat(3, 1fr); gap: 18px; }
      .process-item:after { display: none; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 640px) {
      .container { width: min(100% - 28px, 1180px); }
      .hero { padding: 62px 0 58px; }
      .hero-copy { font-size: 16px; }
      .section { padding: 58px 0; }
      .section-head { display: block; }
      .section-head p { margin-top: 15px; }
      .stats, .feature-grid, .solution-grid, .review-grid, .article-grid, .price-grid { grid-template-columns: 1fr; }
      .score { grid-template-columns: 1fr; padding: 24px; }
      .score-number { font-size: 52px; }
      .process { grid-template-columns: 1fr 1fr; }
      .form-grid { grid-template-columns: 1fr; }
      .full { grid-column: auto; }
      .footer-grid { grid-template-columns: 1fr; }
      .price.featured { transform: none; }
      .hero-panel { padding-left: 18px; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *:before, *:after { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
    }