:root {
      --ink: #201b2d;
      --muted: #6c6677;
      --paper: #fbfaff;
      --white: #ffffff;
      --purple: #6d32d8;
      --purple-dark: #45208e;
      --violet: #9b63f5;
      --coral: #ff735f;
      --teal: #168f91;
      --yellow: #f6c94b;
      --line: #e7e0f1;
      --shadow: 0 18px 50px rgba(61, 33, 112, .12);
      --radius: 14px;
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      font-family: "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; }
    button, input, select, textarea { font: inherit; }
    .container {
      width: min(1160px, calc(100% - 40px));
      margin: 0 auto;
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(251,250,255,.95);
      border-bottom: 1px solid var(--line);
      backdrop-filter: blur(14px);
    }
    .header-inner {
      min-height: 76px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }
    .brand {
      display: inline-flex;
      align-items: center;
      gap: 11px;
      flex: 0 0 auto;
    }
    .ai-page-logo { width: 44px; }
    .brand strong { font-size: 19px; letter-spacing: 0; }
    .brand small {
      display: block;
      color: var(--muted);
      font-size: 11px;
      line-height: 1.2;
    }
    .nav-links {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 0;
      flex-wrap: wrap;
    }
    .nav-links a {
      padding: 7px 9px;
      color: #554c65;
      font-size: 13px;
      transition: color .2s ease, background .2s ease;
    }
    .nav-links a:hover { color: var(--purple); background: #f0e9ff; }
    .nav-cta {
      margin-left: 10px;
      padding: 10px 16px !important;
      color: #fff !important;
      background: var(--purple);
      border-radius: 8px;
    }
    .menu-toggle {
      display: none;
      border: 0;
      background: transparent;
      color: var(--purple-dark);
      font-size: 24px;
      cursor: pointer;
    }

    .hero {
      position: relative;
      overflow: hidden;
      background: var(--purple-dark);
      color: #fff;
      padding: 82px 0 74px;
    }
    .hero:before, .hero:after {
      content: "";
      position: absolute;
      border: 1px solid rgba(255,255,255,.22);
      transform: rotate(22deg);
      pointer-events: none;
    }
    .hero:before {
      width: 250px;
      height: 250px;
      right: 4%;
      top: 25px;
    }
    .hero:after {
      width: 160px;
      height: 160px;
      left: -35px;
      bottom: -30px;
      border-radius: 50%;
    }
    .hero-grid {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: minmax(0, 1.2fr) minmax(300px, .8fr);
      gap: 60px;
      align-items: center;
    }
    .eyebrow {
      display: inline-flex;
      padding: 5px 11px;
      border: 1px solid rgba(255,255,255,.32);
      border-radius: 30px;
      color: #f8ddff;
      font-size: 13px;
    }
    h1, h2, h3, p { margin-top: 0; }
    h1 {
      max-width: 700px;
      margin: 20px 0 18px;
      font-size: clamp(38px, 6vw, 66px);
      line-height: 1.12;
      letter-spacing: 0;
    }
    .hero-copy {
      max-width: 650px;
      color: #e9dcff;
      font-size: 18px;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 30px;
    }
    .button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 46px;
      padding: 10px 19px;
      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 12px 24px rgba(36,13,75,.18); }
    .button-primary { background: var(--coral); color: #fff; }
    .button-light { background: #fff; color: var(--purple-dark); }
    .button-outline { border-color: #cdb8ff; color: #fff; background: transparent; }
    .signal-panel {
      padding: 24px;
      border-left: 3px solid var(--yellow);
      background: rgba(255,255,255,.08);
    }
    .signal-panel h2 { margin-bottom: 12px; font-size: 22px; }
    .signal-panel p { color: #e8dafd; font-size: 14px; }
    .signal-list { display: grid; gap: 11px; margin: 22px 0 0; padding: 0; list-style: none; }
    .signal-list li { display: flex; justify-content: space-between; gap: 12px; border-bottom: 1px solid rgba(255,255,255,.16); padding-bottom: 8px; font-size: 14px; }
    .signal-list b { color: #fff1a8; font-weight: 600; }

    .section { padding: 82px 0; }
    .section-alt { background: #f3effb; }
    .section-head {
      display: flex;
      justify-content: space-between;
      align-items: end;
      gap: 30px;
      margin-bottom: 34px;
    }
    .section-kicker {
      margin-bottom: 7px;
      color: var(--purple);
      font-size: 13px;
      font-weight: 800;
      letter-spacing: 1px;
      text-transform: uppercase;
    }
    h2 {
      margin-bottom: 12px;
      font-size: clamp(28px, 4vw, 42px);
      line-height: 1.2;
    }
    .section-head p { max-width: 590px; margin-bottom: 0; color: var(--muted); }
    .stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 14px;
      margin-top: -25px;
      position: relative;
      z-index: 2;
    }
    .stat {
      padding: 24px 20px;
      background: var(--white);
      border-top: 4px solid var(--purple);
      box-shadow: var(--shadow);
    }
    .stat:nth-child(2) { border-color: var(--coral); }
    .stat:nth-child(3) { border-color: var(--teal); }
    .stat:nth-child(4) { border-color: var(--yellow); }
    .stat strong { display: block; color: var(--purple-dark); font-size: 30px; line-height: 1.2; }
    .stat span { color: var(--muted); font-size: 14px; }

    .intro-grid, .contact-grid, .comparison-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 42px;
      align-items: start;
    }
    .intro-copy p { color: var(--muted); }
    .check-list {
      display: grid;
      gap: 10px;
      margin: 24px 0 0;
      padding: 0;
      list-style: none;
    }
    .check-list li {
      padding: 13px 16px 13px 42px;
      position: relative;
      background: #fff;
      border-left: 3px solid var(--teal);
    }
    .check-list li:before {
      content: "✓";
      position: absolute;
      left: 16px;
      color: var(--teal);
      font-weight: 800;
    }
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 9px;
      padding: 26px;
      background: #fff;
      border: 1px solid var(--line);
    }
    .tag-cloud span {
      padding: 7px 12px;
      border-radius: 5px;
      background: #eee7ff;
      color: var(--purple-dark);
      font-size: 13px;
    }
    .tag-cloud span:nth-child(3n) { background: #e0f5f1; color: #17686a; }
    .tag-cloud span:nth-child(4n) { background: #fff0d1; color: #876019; }

    .service-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
    }
    .service-card {
      padding: 23px 20px;
      background: #fff;
      border: 1px solid var(--line);
      transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
    }
    .service-card:hover { transform: translateY(-5px); border-color: #b898f2; box-shadow: var(--shadow); }
    .service-card .number { color: var(--coral); font-size: 13px; font-weight: 800; }
    .service-card h3 { margin: 12px 0 8px; font-size: 19px; }
    .service-card p { margin-bottom: 0; color: var(--muted); font-size: 14px; }

    .workflow {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 0;
      border-top: 1px solid var(--line);
      border-bottom: 1px solid var(--line);
    }
    .step {
      position: relative;
      padding: 28px 20px 28px 0;
      margin-right: 20px;
    }
    .step:not(:last-child):after {
      content: "→";
      position: absolute;
      right: 2px;
      top: 43px;
      color: var(--coral);
      font-size: 22px;
    }
    .step b {
      display: inline-grid;
      place-items: center;
      width: 35px;
      height: 35px;
      margin-bottom: 13px;
      background: var(--purple);
      color: #fff;
      border-radius: 50%;
    }
    .step h3 { margin-bottom: 7px; font-size: 17px; }
    .step p { margin: 0; color: var(--muted); font-size: 14px; }

    .solution-list {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 14px;
    }
    .solution-item {
      padding: 18px;
      background: #fff;
      border-left: 4px solid var(--purple);
    }
    .solution-item h3 { margin-bottom: 6px; font-size: 17px; }
    .solution-item p { margin: 0; color: var(--muted); font-size: 14px; }

    .network {
      display: grid;
      grid-template-columns: 1.15fr .85fr;
      gap: 30px;
      align-items: center;
    }
    .model-line {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }
    .model-line span {
      padding: 8px 12px;
      background: #fff;
      border: 1px solid var(--line);
      color: #534768;
      font-size: 13px;
    }
    .network-note {
      padding: 26px;
      background: var(--purple-dark);
      color: #fff;
    }
    .network-note strong { color: #ffdf68; font-size: 30px; }

    .comparison-score {
      padding: 26px;
      background: var(--purple-dark);
      color: #fff;
    }
    .score-line { display: flex; align-items: end; gap: 14px; margin-bottom: 15px; }
    .score-line strong { color: #ffdf68; font-size: 58px; line-height: 1; }
    .stars { color: #ffd35b; font-size: 24px; letter-spacing: 2px; }
    .table-wrap { overflow-x: auto; background: #fff; }
    table { width: 100%; min-width: 650px; border-collapse: collapse; }
    th, td { padding: 15px 16px; border-bottom: 1px solid var(--line); text-align: left; font-size: 14px; }
    th { background: #eee7ff; color: var(--purple-dark); }
    td:first-child { font-weight: 700; }
    .good { color: var(--teal); font-weight: 700; }

    .price-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
    }
    .price-card {
      padding: 26px;
      background: #fff;
      border: 1px solid var(--line);
    }
    .price-card.featured { border: 2px solid var(--purple); }
    .price-card h3 { margin-bottom: 6px; }
    .price-card strong { display: block; margin: 15px 0; color: var(--purple); font-size: 25px; }
    .price-card p { margin: 0; color: var(--muted); font-size: 14px; }

    .case-grid, .review-grid, .article-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 18px;
    }
    .case-card, .review-card, .article-card {
      background: #fff;
      border: 1px solid var(--line);
      overflow: hidden;
    }
    .case-card img, .article-card img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
    .case-body, .review-card, .article-card > div { padding: 21px; }
    .case-body h3, .article-card h3 { margin-bottom: 8px; font-size: 19px; }
    .case-body p, .article-card p { margin-bottom: 0; color: var(--muted); font-size: 14px; }
    .review-card { position: relative; }
    .review-card:before { content: "“"; color: var(--violet); font-size: 45px; line-height: .7; }
    .review-card p { color: #4e4759; font-size: 14px; }
    .review-card strong { display: block; color: var(--purple-dark); font-size: 14px; }

    .faq-list { display: grid; gap: 10px; max-width: 900px; }
    .faq-item { background: #fff; border: 1px solid var(--line); }
    .faq-item summary {
      padding: 18px 21px;
      cursor: pointer;
      list-style: none;
      font-weight: 700;
    }
    .faq-item summary::-webkit-details-marker { display: none; }
    .faq-item summary:after { content: "+"; float: right; color: var(--purple); font-size: 21px; }
    .faq-item[open] summary:after { content: "−"; }
    .faq-item p { margin: 0; padding: 0 21px 18px; color: var(--muted); font-size: 14px; }

    .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: #534768; font-size: 14px; font-weight: 700; }
    input, select, textarea {
      width: 100%;
      padding: 12px 13px;
      border: 1px solid #d9d0e8;
      border-radius: 6px;
      background: #fff;
      color: var(--ink);
      outline: none;
    }
    input:focus, select:focus, textarea:focus { border-color: var(--purple); box-shadow: 0 0 0 3px #eee6ff; }
    textarea { min-height: 125px; resize: vertical; }
    .contact-info { padding-top: 8px; }
    .contact-info > p { color: var(--muted); }
    .contact-detail {
      display: grid;
      gap: 12px;
      margin-top: 24px;
    }
    .contact-detail div { padding: 14px 16px; background: #fff; border-left: 3px solid var(--coral); }
    .qr-box { display: flex; gap: 16px; align-items: center; margin-top: 24px; }
    .qr-box img { width: 118px; border: 6px solid #fff; box-shadow: 0 5px 20px rgba(0,0,0,.12); }

    .footer {
      padding: 46px 0 24px;
      background: #211934;
      color: #e9ddff;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.3fr 1fr 1fr;
      gap: 40px;
      padding-bottom: 32px;
    }
    .footer h3 { color: #fff; font-size: 17px; }
    .footer p, .footer a { color: #c8bddd; font-size: 14px; }
    .footer a:hover { color: #fff; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 9px 17px; }
    .footer-bottom {
      display: flex;
      justify-content: space-between;
      gap: 20px;
      padding-top: 20px;
      border-top: 1px solid rgba(255,255,255,.15);
      color: #b9accd;
      font-size: 13px;
    }
    .float-contact {
      position: fixed;
      right: 22px;
      bottom: 22px;
      z-index: 15;
      display: grid;
      gap: 8px;
    }
    .float-contact a {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-width: 44px;
      min-height: 44px;
      padding: 8px 12px;
      background: var(--coral);
      color: #fff;
      border-radius: 8px;
      box-shadow: 0 8px 25px rgba(89,38,77,.25);
      font-size: 13px;
      font-weight: 700;
    }
    .reveal { opacity: 0; transform: translateY(18px); transition: opacity .65s ease, transform .65s ease; }
    .reveal.visible { opacity: 1; transform: translateY(0); }

    @media (max-width: 960px) {
      .nav-links { display: none; position: absolute; top: 76px; left: 0; right: 0; padding: 12px 20px 18px; background: var(--paper); border-bottom: 1px solid var(--line); }
      .nav-links.open { display: grid; grid-template-columns: repeat(2, 1fr); }
      .nav-links a { padding: 10px; }
      .nav-cta { margin-left: 0; text-align: center; }
      .menu-toggle { display: block; }
      .hero-grid, .intro-grid, .contact-grid, .comparison-grid, .network { grid-template-columns: 1fr; }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .workflow { grid-template-columns: repeat(5, minmax(150px, 1fr)); overflow-x: auto; }
      .stats { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 650px) {
      .container { width: min(100% - 28px, 1160px); }
      .section { padding: 60px 0; }
      .header-inner { min-height: 68px; }
      .nav-links { top: 68px; }
      .hero { padding: 60px 0 58px; }
      h1 { font-size: 40px; }
      .hero-copy { font-size: 16px; }
      .section-head { display: block; }
      .section-head p { margin-top: 15px; }
      .stats, .service-grid, .solution-list, .price-grid, .case-grid, .review-grid, .article-grid { grid-template-columns: 1fr; }
      .form-grid { grid-template-columns: 1fr; }
      .field.full { grid-column: auto; }
      .footer-grid { grid-template-columns: 1fr; gap: 22px; }
      .footer-bottom { display: block; }
      .footer-bottom span { display: block; margin-top: 8px; }
      .float-contact { right: 12px; bottom: 12px; }
    }