:root {
      --ink: #172126;
      --muted: #5f6d70;
      --paper: #f3f7f4;
      --white: #ffffff;
      --red: #ee3f43;
      --cyan: #00a7a5;
      --yellow: #f4c641;
      --blue: #305fd4;
      --line: #d9e5df;
      --dark: #172126;
      --shadow: 0 18px 44px rgba(23,33,38,.10);
      --container: 1180px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      background: var(--paper);
      color: var(--ink);
      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(var(--container), calc(100% - 40px));
      margin: 0 auto;
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(243,247,244,.96);
      border-bottom: 1px solid var(--line);
      backdrop-filter: blur(12px);
    }
    .nav-shell {
      min-height: 76px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }
    .brand {
      display: inline-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 {
      padding: 8px 10px;
      color: #314044;
      font-size: 13px;
      transition: color .2s ease, transform .2s ease;
    }
    .nav-links a:hover { color: var(--red); transform: translateY(-2px); }
    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 42px;
      padding: 0 18px;
      background: var(--red);
      color: #fff;
      font-size: 14px;
      font-weight: 700;
      border: 2px solid var(--red);
      transition: transform .2s ease, box-shadow .2s ease;
    }
    .nav-cta:hover { transform: translateY(-2px); box-shadow: 0 9px 18px rgba(238,63,67,.22); }
    .menu-toggle {
      display: none;
      border: 1px solid var(--ink);
      background: transparent;
      color: var(--ink);
      width: 42px;
      height: 38px;
      font-size: 20px;
    }
    .hero {
      position: relative;
      overflow: hidden;
      padding: 90px 0 80px;
      background: #f3f7f4;
      border-bottom: 1px solid var(--line);
    }
    .hero:before, .hero:after {
      content: "";
      position: absolute;
      pointer-events: none;
    }
    .hero:before {
      width: 230px;
      height: 230px;
      right: 4%;
      top: 34px;
      background: var(--yellow);
      transform: rotate(14deg);
    }
    .hero:after {
      width: 150px;
      height: 150px;
      right: 13%;
      bottom: -66px;
      background: var(--cyan);
      border-radius: 50%;
    }
    .hero-grid {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: minmax(0, 1.12fr) minmax(320px, .88fr);
      gap: 64px;
      align-items: center;
    }
    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 9px;
      margin: 0 0 18px;
      color: var(--red);
      font-size: 13px;
      font-weight: 800;
      letter-spacing: .08em;
    }
    .eyebrow:before {
      content: "";
      width: 28px;
      height: 5px;
      background: var(--red);
    }
    h1, h2, h3, p { margin-top: 0; }
    h1 {
      max-width: 680px;
      margin-bottom: 22px;
      font-size: clamp(38px, 6vw, 76px);
      line-height: 1.08;
      letter-spacing: 0;
    }
    .hero-copy {
      max-width: 650px;
      color: var(--muted);
      font-size: 18px;
    }
    .hero-actions {
      display: flex;
      gap: 12px;
      flex-wrap: wrap;
      margin: 30px 0 34px;
    }
    .button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 48px;
      padding: 0 22px;
      border: 2px solid var(--ink);
      font-weight: 800;
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    }
    .button:hover { transform: translateY(-3px); box-shadow: 0 10px 20px rgba(23,33,38,.14); }
    .button-primary { background: var(--red); border-color: var(--red); color: #fff; }
    .button-secondary { background: #fff; color: var(--ink); }
    .hero-notes {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      color: #3d5053;
      font-size: 13px;
    }
    .hero-notes span {
      padding: 6px 10px;
      background: #fff;
      border-left: 4px solid var(--cyan);
    }
    .hero-panel {
      position: relative;
      padding: 24px;
      background: var(--dark);
      color: #fff;
      box-shadow: var(--shadow);
      transform: rotate(1.5deg);
    }
    .hero-panel h2 { margin-bottom: 20px; font-size: 23px; }
    .panel-line {
      display: flex;
      justify-content: space-between;
      gap: 18px;
      padding: 14px 0;
      border-top: 1px solid rgba(255,255,255,.18);
      color: #dbe8e6;
      font-size: 14px;
    }
    .panel-line strong { color: var(--yellow); font-size: 19px; }
    .panel-stamp {
      position: absolute;
      right: -18px;
      bottom: -22px;
      width: 92px;
      height: 92px;
      display: grid;
      place-items: center;
      background: var(--red);
      color: #fff;
      border-radius: 50%;
      font-size: 13px;
      font-weight: 800;
      text-align: center;
      transform: rotate(-13deg);
    }
    .section {
      padding: 86px 0;
    }
    .section-alt { background: #e9f3ef; }
    .section-dark { background: var(--dark); color: #fff; }
    .section-heading {
      display: flex;
      justify-content: space-between;
      align-items: end;
      gap: 28px;
      margin-bottom: 38px;
    }
    .section-heading h2 {
      max-width: 650px;
      margin-bottom: 0;
      font-size: clamp(28px, 4vw, 48px);
      line-height: 1.15;
    }
    .section-heading p {
      max-width: 470px;
      margin-bottom: 0;
      color: var(--muted);
    }
    .section-dark .section-heading p { color: #b7c9c7; }
    .accent-line {
      width: 62px;
      height: 7px;
      margin-bottom: 15px;
      background: var(--yellow);
    }
    .metric-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 14px;
    }
    .metric {
      padding: 24px;
      background: #fff;
      border-top: 5px solid var(--cyan);
      box-shadow: 0 8px 20px rgba(23,33,38,.06);
    }
    .metric:nth-child(2) { border-color: var(--red); }
    .metric:nth-child(3) { border-color: var(--yellow); }
    .metric:nth-child(4) { border-color: var(--blue); }
    .metric strong { display: block; margin-bottom: 5px; font-size: 34px; line-height: 1; }
    .metric span { color: var(--muted); font-size: 14px; }
    .about-layout {
      display: grid;
      grid-template-columns: .85fr 1.15fr;
      gap: 52px;
      align-items: start;
    }
    .about-lead {
      padding: 28px;
      background: var(--red);
      color: #fff;
      box-shadow: var(--shadow);
    }
    .about-lead h3 { font-size: 28px; line-height: 1.25; }
    .about-lead p { color: #fff5f2; }
    .feature-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 18px 28px;
    }
    .feature-item {
      padding-top: 16px;
      border-top: 2px solid var(--ink);
    }
    .feature-item h3 { margin-bottom: 7px; font-size: 19px; }
    .feature-item p { margin-bottom: 0; color: var(--muted); font-size: 14px; }
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 18px;
    }
    .service-card {
      padding: 24px;
      background: #fff;
      border: 1px solid var(--line);
      transition: transform .25s ease, box-shadow .25s ease;
    }
    .service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
    .service-card:nth-child(3n+1) { border-top: 5px solid var(--red); }
    .service-card:nth-child(3n+2) { border-top: 5px solid var(--cyan); }
    .service-card:nth-child(3n) { border-top: 5px solid var(--yellow); }
    .service-index { color: var(--red); font-size: 13px; font-weight: 800; }
    .service-card h3 { margin: 9px 0 9px; font-size: 20px; }
    .service-card p { margin-bottom: 0; color: var(--muted); font-size: 14px; }
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 28px;
    }
    .tag-cloud span {
      padding: 8px 13px;
      background: #fff;
      border: 1px solid var(--line);
      color: #304246;
      font-size: 13px;
    }
    .workflow {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 0;
      border-top: 2px solid var(--yellow);
    }
    .step {
      position: relative;
      padding: 25px 18px 18px 0;
      margin-right: 20px;
      border-bottom: 1px solid rgba(255,255,255,.2);
    }
    .step:last-child { margin-right: 0; }
    .step-number {
      display: inline-grid;
      place-items: center;
      width: 38px;
      height: 38px;
      margin-bottom: 17px;
      background: var(--yellow);
      color: var(--dark);
      font-weight: 900;
    }
    .step h3 { margin-bottom: 8px; font-size: 18px; }
    .step p { margin-bottom: 0; color: #bbccca; font-size: 14px; }
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 18px;
    }
    .solution {
      padding: 24px;
      background: #fff;
      border-left: 8px solid var(--blue);
    }
    .solution:nth-child(2) { border-color: var(--red); }
    .solution:nth-child(3) { border-color: var(--cyan); }
    .solution h3 { margin-bottom: 9px; }
    .solution p { color: var(--muted); margin-bottom: 0; font-size: 14px; }
    .network-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 22px;
    }
    .network-box {
      padding: 30px;
      background: #fff;
      border: 1px solid var(--line);
    }
    .network-box h3 { margin-bottom: 15px; }
    .network-items {
      display: flex;
      flex-wrap: wrap;
      gap: 9px;
    }
    .network-items span {
      padding: 8px 12px;
      background: #edf5f2;
      color: #31474a;
      font-size: 13px;
    }
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .case-card {
      overflow: hidden;
      background: #fff;
      border: 1px solid var(--line);
    }
    .case-image { aspect-ratio: 16 / 9; overflow: hidden; background: #dce9e5; }
    .case-image img { width: 100%; height: 100%; object-fit: cover; }
    .case-body { padding: 20px; }
    .case-body h3 { margin-bottom: 8px; }
    .case-body p { margin-bottom: 0; color: var(--muted); font-size: 14px; }
    .compare-wrap { overflow-x: auto; background: #fff; border: 1px solid var(--line); }
    .compare-table {
      width: 100%;
      min-width: 760px;
      border-collapse: collapse;
      text-align: left;
    }
    .compare-table th, .compare-table td {
      padding: 16px 18px;
      border-bottom: 1px solid var(--line);
      vertical-align: top;
    }
    .compare-table th { background: var(--dark); color: #fff; font-size: 14px; }
    .compare-table th:last-child { background: var(--red); }
    .compare-table td { color: var(--muted); font-size: 14px; }
    .compare-table td:first-child { color: var(--ink); font-weight: 800; }
    .rating-box {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 20px;
      margin-bottom: 26px;
      padding: 22px 25px;
      background: var(--yellow);
    }
    .rating-score { font-size: 44px; font-weight: 900; line-height: 1; }
    .stars { color: var(--red); font-size: 25px; letter-spacing: 0; }
    .rating-box p { margin: 0; font-size: 14px; }
    .price-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px;
    }
    .price-card {
      padding: 26px;
      background: #fff;
      border: 1px solid var(--line);
    }
    .price-card h3 { margin-bottom: 9px; }
    .price-card strong { display: block; margin: 12px 0; color: var(--red); font-size: 30px; }
    .price-card p { margin-bottom: 0; color: var(--muted); font-size: 14px; }
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 18px;
    }
    .review {
      padding: 23px;
      background: #fff;
      border-top: 4px solid var(--cyan);
    }
    .review:nth-child(2n) { border-color: var(--red); }
    .review p { color: #334447; font-size: 15px; }
    .review cite { color: var(--muted); font-size: 13px; font-style: normal; font-weight: 800; }
    .faq-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 12px 18px;
    }
    details {
      background: #fff;
      border: 1px solid var(--line);
    }
    summary {
      cursor: pointer;
      padding: 17px 20px;
      font-weight: 800;
      list-style: none;
    }
    summary::-webkit-details-marker { display: none; }
    summary:after { content: "+"; float: right; color: var(--red); font-size: 21px; line-height: 1; }
    details[open] summary:after { content: "−"; }
    details p { margin: 0; padding: 0 20px 18px; color: var(--muted); font-size: 14px; }
    .article-grid {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 12px;
    }
    .article-link {
      display: block;
      padding: 17px;
      min-height: 112px;
      background: #fff;
      border-bottom: 4px solid var(--blue);
      transition: transform .2s ease;
    }
    .article-link:hover { transform: translateY(-4px); }
    .article-link strong { display: block; margin-bottom: 8px; font-size: 14px; }
    .article-link span { color: var(--muted); font-size: 12px; }
    .contact-layout {
      display: grid;
      grid-template-columns: .8fr 1.2fr;
      gap: 32px;
      align-items: start;
    }
    .contact-copy {
      padding: 30px;
      background: var(--dark);
      color: #fff;
    }
    .contact-copy p { color: #c3d2d0; }
    .contact-list { margin: 24px 0 0; padding: 0; list-style: none; }
    .contact-list li { padding: 10px 0; border-top: 1px solid rgba(255,255,255,.18); color: #d9e7e4; }
    .contact-form {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      padding: 30px;
      background: #fff;
      border: 1px solid var(--line);
    }
    .field { display: flex; flex-direction: column; gap: 7px; }
    .field-full { grid-column: 1 / -1; }
    label { color: var(--ink); font-size: 13px; font-weight: 800; }
    input, select, textarea {
      width: 100%;
      border: 1px solid #c9d9d4;
      background: #fbfdfc;
      color: var(--ink);
      padding: 12px 13px;
      font: inherit;
      outline: none;
    }
    input:focus, select:focus, textarea:focus { border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(0,167,165,.12); }
    textarea { min-height: 130px; resize: vertical; }
    .form-note { grid-column: 1 / -1; margin: -4px 0 0; color: var(--muted); font-size: 12px; }
    .join-banner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 25px;
      padding: 30px;
      background: var(--red);
      color: #fff;
    }
    .join-banner h2 { margin-bottom: 7px; font-size: 30px; }
    .join-banner p { margin-bottom: 0; color: #fff4f1; }
    .join-banner .button { background: #fff; border-color: #fff; color: var(--red); }
    .footer {
      padding: 42px 0 24px;
      background: #102024;
      color: #dce9e6;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.1fr .9fr 1.2fr;
      gap: 28px;
      padding-bottom: 30px;
    }
    .footer h3 { color: #fff; font-size: 18px; }
    .footer p { color: #b9ccca; font-size: 14px; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 8px 14px; }
    .footer-links a { color: #dce9e6; font-size: 13px; }
    .footer-links a:hover { color: var(--yellow); }
    .copyright {
      padding-top: 18px;
      border-top: 1px solid rgba(255,255,255,.16);
      color: #98aeab;
      font-size: 12px;
    }
    .float-tools {
      position: fixed;
      right: 18px;
      bottom: 20px;
      z-index: 15;
      display: grid;
      gap: 8px;
    }
    .float-tools a {
      display: grid;
      place-items: center;
      width: 48px;
      height: 48px;
      background: var(--red);
      color: #fff;
      box-shadow: 0 8px 20px rgba(23,33,38,.18);
      font-size: 12px;
      font-weight: 800;
    }
    .qr-pop {
      position: absolute;
      right: 0;
      bottom: 58px;
      display: none;
      width: 160px;
      padding: 10px;
      background: #fff;
      border: 1px solid var(--line);
      box-shadow: var(--shadow);
    }
    .qr-pop img { width: 140px; }
    .float-tools .service-float:hover + .qr-pop, .qr-pop:hover { display: block; }
    .reveal { opacity: 0; transform: translateY(20px); transition: opacity .65s ease, transform .65s ease; }
    .reveal.visible { opacity: 1; transform: translateY(0); }
    @media (max-width: 1050px) {
      .nav-links a { padding-left: 6px; padding-right: 6px; font-size: 12px; }
      .hero-grid { gap: 35px; }
      .article-grid { grid-template-columns: repeat(3, 1fr); }
    }
    @media (max-width: 820px) {
      .nav-shell { min-height: 68px; }
      .menu-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        left: 20px;
        right: 20px;
        top: 68px;
        padding: 12px;
        background: #fff;
        border: 1px solid var(--line);
        box-shadow: var(--shadow);
      }
      .nav-links.open { display: grid; grid-template-columns: repeat(2, 1fr); }
      .nav-links a { padding: 11px 10px; border-bottom: 1px solid #edf1ef; }
      .nav-cta { margin: 8px; }
      .hero { padding: 66px 0 62px; }
      .hero-grid, .about-layout, .contact-layout, .network-layout { grid-template-columns: 1fr; }
      .hero-panel { max-width: 560px; }
      .metric-grid { grid-template-columns: repeat(2, 1fr); }
      .service-grid, .solution-grid, .case-grid { grid-template-columns: repeat(2, 1fr); }
      .workflow { grid-template-columns: repeat(2, 1fr); gap: 20px; border-top: 0; }
      .step { margin-right: 0; border-top: 2px solid var(--yellow); }
      .review-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 560px) {
      .container { width: min(var(--container), calc(100% - 28px)); }
      .hero { padding-top: 52px; }
      h1 { font-size: 42px; }
      .hero-copy { font-size: 16px; }
      .hero:before { width: 130px; height: 130px; right: -24px; top: 20px; }
      .hero-panel { transform: none; }
      .section { padding: 62px 0; }
      .section-heading { display: block; }
      .section-heading p { margin-top: 16px; }
      .metric-grid, .service-grid, .solution-grid, .case-grid, .review-grid, .faq-grid, .price-grid, .feature-list { grid-template-columns: 1fr; }
      .workflow { grid-template-columns: 1fr; }
      .article-grid { grid-template-columns: 1fr 1fr; }
      .contact-form { grid-template-columns: 1fr; padding: 20px; }
      .field-full, .form-note { grid-column: auto; }
      .join-banner { display: block; padding: 24px; }
      .join-banner .button { margin-top: 18px; }
      .footer-grid { grid-template-columns: 1fr; }
      .float-tools { right: 12px; bottom: 12px; }
    }
    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      *, *:before, *:after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
    }