:root {
      --ink: #172033;
      --muted: #5f6b7d;
      --line: #dfe5ef;
      --paper: #f7f9fc;
      --white: #ffffff;
      --blue: #2447e8;
      --cyan: #00a9c7;
      --orange: #ff7146;
      --pink: #f13f86;
      --yellow: #ffd449;
      --green: #159b79;
      --dark: #152044;
      --shadow: 0 18px 45px rgba(35, 53, 105, .12);
      --radius: 18px;
      --container: 1180px;
    }
    * { 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(var(--container), calc(100% - 40px));
      margin: 0 auto;
    }
    .topbar {
      background: var(--dark);
      color: #eef3ff;
      font-size: 13px;
    }
    .topbar-inner {
      min-height: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
    }
    .topbar strong { color: var(--yellow); }
    header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(255,255,255,.96);
      border-bottom: 1px solid var(--line);
      backdrop-filter: blur(12px);
    }
    .nav {
      min-height: 76px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 26px;
    }
    .brand {
      display: inline-flex;
      align-items: center;
      gap: 11px;
      min-width: 190px;
      font-weight: 800;
      color: var(--dark);
      white-space: nowrap;
    }
    .ai-page-logo { width: 42px; }
    .brand-text { font-size: 19px; letter-spacing: 0; }
    .nav-links {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 0;
      flex-wrap: wrap;
      color: #39445a;
      font-size: 14px;
    }
    .nav-links a {
      padding: 8px 9px;
      border-radius: 7px;
      transition: .25s ease;
    }
    .nav-links a:hover { color: var(--blue); background: #eef2ff; }
    .nav-cta, .button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border: 0;
      cursor: pointer;
      border-radius: 9px;
      padding: 12px 18px;
      font-weight: 700;
      transition: transform .25s ease, box-shadow .25s ease, background .25s ease;
    }
    .nav-cta, .button-primary { color: #fff; background: var(--blue); box-shadow: 0 8px 20px rgba(36,71,232,.22); }
    .button-secondary { color: var(--dark); background: var(--yellow); }
    .button-light { color: var(--blue); background: #fff; }
    .button:hover, .nav-cta:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(36,71,232,.25); }
    .menu-toggle { display: none; border: 0; background: transparent; color: var(--dark); font-size: 24px; }
    .hero {
      position: relative;
      overflow: hidden;
      background: var(--blue);
      color: #fff;
      padding: 84px 0 72px;
    }
    .hero:before, .hero:after {
      content: "";
      position: absolute;
      width: 190px;
      height: 190px;
      transform: rotate(18deg);
      opacity: .9;
    }
    .hero:before { right: 7%; top: 35px; background: var(--pink); }
    .hero:after { right: -50px; bottom: -55px; background: var(--yellow); }
    .hero-inner {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: minmax(0, 1.15fr) minmax(300px, .85fr);
      gap: 60px;
      align-items: center;
    }
    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: var(--yellow);
      font-size: 14px;
      font-weight: 800;
      letter-spacing: 1px;
    }
    .eyebrow:before { content: ""; width: 25px; height: 4px; background: var(--yellow); }
    h1, h2, h3, p { margin-top: 0; }
    h1 {
      max-width: 680px;
      margin-bottom: 20px;
      font-size: clamp(38px, 6vw, 72px);
      line-height: 1.12;
      letter-spacing: 0;
    }
    .hero-copy {
      max-width: 650px;
      color: #e8edff;
      font-size: 18px;
    }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 13px; margin-top: 30px; }
    .hero-note { margin: 18px 0 0; color: #d9e2ff; font-size: 13px; }
    .hero-panel {
      padding: 24px;
      background: var(--white);
      color: var(--ink);
      border: 7px solid var(--yellow);
      box-shadow: 16px 16px 0 var(--pink);
      transform: rotate(2deg);
    }
    .hero-panel h2 { margin-bottom: 18px; font-size: 22px; }
    .signal-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      padding: 13px 0;
      border-bottom: 1px solid var(--line);
    }
    .signal-row:last-child { border-bottom: 0; }
    .signal-value { color: var(--blue); font-weight: 800; }
    .section { padding: 82px 0; }
    .section-alt { background: #fff; }
    .section-dark { color: #fff; background: var(--dark); }
    .section-head { max-width: 760px; margin-bottom: 36px; }
    .section-head.center { margin-right: auto; margin-left: auto; text-align: center; }
    .section-kicker { color: var(--pink); font-size: 13px; font-weight: 800; letter-spacing: 1.5px; }
    .section-dark .section-kicker { color: var(--yellow); }
    h2 { margin-bottom: 12px; font-size: clamp(28px, 4vw, 45px); line-height: 1.2; }
    h3 { margin-bottom: 8px; font-size: 20px; line-height: 1.35; }
    .lead { color: var(--muted); font-size: 17px; }
    .section-dark .lead { color: #d9e0f2; }
    .metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 14px;
      margin-top: -34px;
      position: relative;
      z-index: 2;
    }
    .metric {
      padding: 24px 20px;
      background: #fff;
      border-top: 5px solid var(--orange);
      box-shadow: var(--shadow);
    }
    .metric:nth-child(2) { border-color: var(--cyan); }
    .metric:nth-child(3) { border-color: var(--pink); }
    .metric:nth-child(4) { border-color: var(--yellow); }
    .metric strong { display: block; color: var(--blue); font-size: 32px; line-height: 1.1; }
    .metric span { color: var(--muted); font-size: 14px; }
    .about-grid, .contact-grid, .network-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 46px;
      align-items: start;
    }
    .feature-list { display: grid; grid-template-columns: 1fr 1fr; gap: 13px; padding: 0; list-style: none; }
    .feature-list li {
      padding: 16px;
      background: #fff;
      border-left: 4px solid var(--cyan);
      box-shadow: 0 8px 20px rgba(23,32,51,.06);
    }
    .feature-list b { display: block; margin-bottom: 4px; }
    .feature-list span { color: var(--muted); font-size: 14px; }
    .service-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
    .service-card {
      padding: 22px;
      background: #fff;
      border: 1px solid var(--line);
      border-radius: var(--radius);
      transition: .25s ease;
    }
    .service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); border-color: var(--cyan); }
    .service-card .num { color: var(--pink); font-weight: 900; font-size: 13px; }
    .service-card p, .case-card p, .review p, .faq-answer { color: var(--muted); font-size: 14px; }
    .service-card a { color: var(--blue); font-size: 14px; font-weight: 700; }
    .workflow {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 0;
      counter-reset: step;
    }
    .workflow-item {
      position: relative;
      padding: 22px 18px 20px;
      border-top: 4px solid var(--yellow);
      background: #fff;
      color: var(--ink);
      min-height: 175px;
    }
    .workflow-item:not(:last-child):after {
      content: "→";
      position: absolute;
      right: -12px;
      top: 53px;
      z-index: 2;
      color: var(--pink);
      font-size: 24px;
      font-weight: 800;
    }
    .workflow-item b { display: block; color: var(--blue); margin-bottom: 8px; }
    .workflow-item p { color: var(--muted); font-size: 14px; }
    .solution-grid, .case-grid, .review-grid, .article-grid { display: grid; gap: 16px; }
    .solution-grid { grid-template-columns: repeat(3, 1fr); }
    .solution-card {
      padding: 25px;
      min-height: 190px;
      color: #fff;
      background: var(--pink);
    }
    .solution-card:nth-child(2) { background: var(--orange); }
    .solution-card:nth-child(3) { background: var(--cyan); }
    .solution-card:nth-child(4) { background: var(--green); }
    .solution-card p { color: #fff; opacity: .92; font-size: 14px; }
    .network-grid { align-items: center; }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 9px; }
    .tag-cloud span {
      display: inline-block;
      padding: 7px 12px;
      color: var(--dark);
      background: var(--yellow);
      border-radius: 6px;
      font-size: 13px;
      font-weight: 700;
    }
    .tag-cloud span:nth-child(3n) { background: #b9f3ee; }
    .tag-cloud span:nth-child(3n+1) { background: #ffd2e3; }
    .network-box { padding: 30px; background: #eef3ff; border-left: 7px solid var(--blue); }
    .network-box strong { color: var(--blue); font-size: 32px; }
    .table-wrap { overflow-x: auto; background: #fff; border: 1px solid var(--line); }
    table { width: 100%; min-width: 760px; border-collapse: collapse; }
    th, td { padding: 16px 18px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
    th { color: #fff; background: var(--dark); }
    td:first-child { font-weight: 700; }
    .check { color: var(--green); font-weight: 800; }
    .score-panel {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 25px;
      margin-bottom: 25px;
      padding: 26px;
      color: #fff;
      background: var(--blue);
    }
    .score-number { font-size: 50px; font-weight: 900; line-height: 1; color: var(--yellow); }
    .stars { color: var(--yellow); letter-spacing: 4px; font-size: 22px; }
    .case-grid { grid-template-columns: repeat(3, 1fr); }
    .case-card { overflow: hidden; background: #fff; border: 1px solid var(--line); }
    .case-media { aspect-ratio: 16 / 9; overflow: hidden; background: #edf2fa; }
    .case-media img { width: 100%; height: 100%; object-fit: cover; }
    .case-body { padding: 21px; }
    .case-label { color: var(--pink); font-size: 13px; font-weight: 800; }
    .review-grid { grid-template-columns: repeat(3, 1fr); }
    .review { padding: 24px; background: #fff; border-top: 4px solid var(--cyan); }
    .review:nth-child(2n) { border-color: var(--pink); }
    .review:nth-child(3n) { border-color: var(--yellow); }
    .review cite { color: var(--dark); font-style: normal; font-weight: 800; font-size: 14px; }
    .review small { display: block; color: var(--muted); margin-top: 4px; }
    .price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .price-card { padding: 27px; background: #fff; border: 1px solid var(--line); }
    .price-card.featured { color: #fff; background: var(--dark); border-color: var(--dark); transform: translateY(-8px); }
    .price-card strong { display: block; color: var(--blue); font-size: 28px; margin: 10px 0; }
    .price-card.featured strong { color: var(--yellow); }
    .price-card p { color: var(--muted); font-size: 14px; }
    .price-card.featured p { color: #dbe3f7; }
    .faq-list { display: grid; gap: 10px; max-width: 900px; margin: 0 auto; }
    .faq-item { background: #fff; border: 1px solid var(--line); }
    .faq-question {
      width: 100%;
      display: flex;
      justify-content: space-between;
      gap: 18px;
      padding: 18px 20px;
      border: 0;
      color: var(--ink);
      background: transparent;
      text-align: left;
      cursor: pointer;
      font-weight: 800;
    }
    .faq-question span { color: var(--blue); font-size: 21px; line-height: 1; }
    .faq-answer { display: none; padding: 0 20px 18px; }
    .faq-item.open .faq-answer { display: block; }
    .faq-item.open .faq-question span { transform: rotate(45deg); }
    .article-grid { grid-template-columns: repeat(5, 1fr); }
    .article-card { padding: 18px; background: #fff; border-bottom: 4px solid var(--pink); }
    .article-card h3 { font-size: 16px; }
    .article-card a { color: var(--blue); font-size: 13px; font-weight: 700; }
    .contact-form {
      padding: 30px;
      background: #fff;
      border: 1px solid var(--line);
      box-shadow: var(--shadow);
    }
    .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(--dark); font-size: 14px; font-weight: 700; }
    input, select, textarea {
      width: 100%;
      padding: 12px 13px;
      color: var(--ink);
      background: #fbfcff;
      border: 1px solid #ccd5e4;
      border-radius: 7px;
      outline: 0;
    }
    input:focus, select:focus, textarea:focus { border-color: var(--blue); box-shadow: 0 0 0 3px #dfe5ff; }
    textarea { min-height: 125px; resize: vertical; }
    .contact-info { padding: 30px; color: #fff; background: var(--dark); }
    .contact-info a { color: var(--yellow); }
    .contact-list { padding: 0; list-style: none; }
    .contact-list li { padding: 13px 0; border-bottom: 1px solid rgba(255,255,255,.14); }
    .contact-qr { width: 150px; margin-top: 16px; }
    .join-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 30px;
      padding: 35px;
      color: #fff;
      background: var(--orange);
    }
    .join-banner p { max-width: 650px; color: #fff; opacity: .95; }
    .footer {
      padding: 48px 0 24px;
      color: #dce4f7;
      background: var(--dark);
    }
    .footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1.2fr; gap: 40px; }
    .footer h3 { color: #fff; font-size: 18px; }
    .footer p, .footer li { color: #b9c5dc; font-size: 14px; }
    .footer ul { margin: 0; padding: 0; list-style: none; }
    .footer li { margin: 7px 0; }
    .footer a:hover { color: var(--yellow); }
    .friend-links { display: flex; flex-wrap: wrap; gap: 8px 15px; }
    .copyright { margin-top: 35px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.15); color: #aab6ce; font-size: 13px; }
    .float-actions { position: fixed; right: 20px; bottom: 22px; z-index: 15; display: grid; gap: 9px; }
    .float-actions a {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 48px;
      height: 48px;
      color: #fff;
      background: var(--pink);
      border-radius: 50%;
      box-shadow: 0 8px 20px rgba(241,63,134,.3);
      font-size: 12px;
      font-weight: 800;
    }
    .float-actions 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: 1050px) {
      .nav { gap: 12px; }
      .brand { min-width: auto; }
      .nav-links a { padding: 7px 5px; font-size: 13px; }
      .service-grid { grid-template-columns: repeat(3, 1fr); }
      .article-grid { grid-template-columns: repeat(3, 1fr); }
    }
    @media (max-width: 800px) {
      .container { width: min(var(--container), calc(100% - 28px)); }
      .topbar-inner { padding: 7px 0; align-items: flex-start; }
      .topbar-inner span:last-child { display: none; }
      .nav { min-height: 66px; }
      .menu-toggle { display: block; }
      .nav-cta { display: none; }
      .nav-links {
        display: none;
        position: absolute;
        top: 66px;
        left: 0;
        right: 0;
        padding: 12px 14px 18px;
        background: #fff;
        border-bottom: 1px solid var(--line);
        box-shadow: 0 12px 24px rgba(23,32,51,.1);
      }
      .nav-links.open { display: grid; grid-template-columns: repeat(2, 1fr); }
      .nav-links a { padding: 10px 8px; }
      .hero { padding: 58px 0 64px; }
      .hero-inner, .about-grid, .contact-grid, .network-grid { grid-template-columns: 1fr; gap: 35px; }
      .hero-panel { max-width: 450px; transform: none; }
      .metrics { grid-template-columns: repeat(2, 1fr); margin-top: -20px; }
      .service-grid, .solution-grid, .case-grid, .review-grid, .price-grid { grid-template-columns: repeat(2, 1fr); }
      .workflow { grid-template-columns: 1fr; gap: 12px; }
      .workflow-item { min-height: auto; }
      .workflow-item:not(:last-child):after { content: "↓"; top: auto; right: 20px; bottom: -22px; }
      .article-grid { grid-template-columns: repeat(2, 1fr); }
      .join-banner { align-items: flex-start; flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 520px) {
      h1 { font-size: 40px; }
      .section { padding: 58px 0; }
      .feature-list, .service-grid, .solution-grid, .case-grid, .review-grid, .price-grid, .article-grid, .form-grid { grid-template-columns: 1fr; }
      .field.full { grid-column: auto; }
      .metrics { gap: 9px; }
      .metric { padding: 17px 13px; }
      .metric strong { font-size: 25px; }
      .score-panel { align-items: flex-start; flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr; gap: 25px; }
      .contact-form, .contact-info { padding: 22px; }
    }