:root {
      --ink: #152332;
      --muted: #607080;
      --paper: #f7fbfa;
      --surface: #ffffff;
      --line: #d9e7e4;
      --cyan: #00b8c8;
      --cyan-dark: #087d8b;
      --lime: #c7ef4b;
      --pink: #ff5e9c;
      --violet: #7766e8;
      --yellow: #ffd35c;
      --shadow: 0 14px 40px rgba(18, 56, 68, .09);
      --radius: 16px;
      --container: 1180px;
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      background: var(--paper);
      color: var(--ink);
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", Arial, sans-serif;
      line-height: 1.7;
    }
    a { color: inherit; text-decoration: none; }
    img { display: block; max-width: 100%; height: auto; }
    button, input, select, textarea { font: inherit; }
    .container {
      width: min(var(--container), calc(100% - 40px));
      margin: 0 auto;
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(247, 251, 250, .94);
      border-bottom: 1px solid rgba(217, 231, 228, .9);
      backdrop-filter: blur(14px);
    }
    .nav-wrap {
      min-height: 74px;
      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;
      max-height: 48px;
      object-fit: contain;
    }
    .nav-links {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 0;
      flex-wrap: wrap;
    }
    .nav-links a {
      padding: 8px 10px;
      color: #405261;
      font-size: 13px;
      transition: color .2s ease, background .2s ease;
      border-radius: 8px;
    }
    .nav-links a:hover { color: var(--cyan-dark); background: #e5f8f5; }
    .nav-cta, .menu-toggle { display: none; }
    .hero {
      position: relative;
      overflow: hidden;
      padding: 90px 0 76px;
      background: #f7fbfa;
      border-bottom: 1px solid var(--line);
    }
    .hero:before, .hero:after {
      content: "";
      position: absolute;
      pointer-events: none;
      border: 1px solid rgba(0, 184, 200, .24);
      transform: rotate(24deg);
    }
    .hero:before {
      width: 280px;
      height: 280px;
      right: -80px;
      top: 56px;
      box-shadow: -36px 36px 0 rgba(199, 239, 75, .26), -72px 72px 0 rgba(255, 94, 156, .17);
    }
    .hero:after {
      width: 130px;
      height: 130px;
      left: -54px;
      bottom: 34px;
      border-color: rgba(119, 102, 232, .28);
    }
    .hero-grid {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: minmax(0, 1.1fr) minmax(320px, .9fr);
      gap: 64px;
      align-items: center;
    }
    .eyebrow, .section-kicker {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: var(--cyan-dark);
      font-size: 13px;
      font-weight: 800;
      letter-spacing: .08em;
      text-transform: uppercase;
    }
    .eyebrow:before, .section-kicker:before {
      content: "";
      width: 26px;
      height: 3px;
      background: var(--pink);
      border-radius: 3px;
    }
    h1, h2, h3, p { margin-top: 0; }
    h1 {
      max-width: 700px;
      margin: 18px 0;
      font-size: clamp(38px, 6vw, 70px);
      line-height: 1.12;
      letter-spacing: 0;
    }
    .hero-copy {
      max-width: 680px;
      color: var(--muted);
      font-size: 18px;
    }
    .hero-actions {
      display: flex;
      gap: 12px;
      flex-wrap: wrap;
      margin-top: 30px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 46px;
      padding: 0 20px;
      border: 1px solid transparent;
      border-radius: 9px;
      font-weight: 800;
      cursor: pointer;
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    }
    .btn:hover { transform: translateY(-2px); box-shadow: 0 9px 20px rgba(18, 56, 68, .13); }
    .btn-primary { background: var(--cyan); color: #082a31; }
    .btn-secondary { background: var(--surface); color: var(--ink); border-color: var(--line); }
    .btn-lime { background: var(--lime); color: #26330c; }
    .hero-panel {
      position: relative;
      padding: 24px;
      background: var(--ink);
      color: #f5ffff;
      border-radius: 20px;
      box-shadow: 18px 18px 0 var(--lime);
      border: 1px solid #263c4d;
    }
    .hero-panel h2 { margin-bottom: 10px; font-size: 25px; }
    .hero-panel p { color: #c5d4dc; margin-bottom: 20px; }
    .signal-list { display: grid; gap: 12px; }
    .signal {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 13px 0;
      border-top: 1px solid rgba(255,255,255,.14);
      font-size: 14px;
    }
    .signal i {
      width: 11px;
      height: 11px;
      flex: 0 0 auto;
      background: var(--pink);
      border-radius: 50%;
      box-shadow: 0 0 0 5px rgba(255,94,156,.14);
    }
    .signal:nth-child(2) i { background: var(--cyan); }
    .signal:nth-child(3) i { background: var(--lime); }
    .section {
      padding: 88px 0;
      position: relative;
    }
    .section.alt { background: #eef8f5; border-top: 1px solid #e0efeb; border-bottom: 1px solid #e0efeb; }
    .section-head {
      display: flex;
      align-items: end;
      justify-content: space-between;
      gap: 24px;
      margin-bottom: 32px;
    }
    .section-head h2 { margin: 10px 0 0; font-size: clamp(29px, 4vw, 46px); line-height: 1.18; }
    .section-head p { max-width: 520px; color: var(--muted); margin-bottom: 0; }
    .intro-layout {
      display: grid;
      grid-template-columns: 1.3fr .7fr;
      gap: 28px;
      align-items: start;
    }
    .intro-text {
      padding: 28px 30px;
      background: var(--surface);
      border-left: 5px solid var(--cyan);
      box-shadow: var(--shadow);
    }
    .intro-text p:last-child { margin-bottom: 0; }
    .highlight-stack { display: grid; gap: 12px; }
    .metric {
      padding: 20px;
      background: var(--surface);
      border: 1px solid var(--line);
      border-top: 4px solid var(--pink);
      border-radius: 12px;
    }
    .metric:nth-child(2) { border-top-color: var(--lime); }
    .metric:nth-child(3) { border-top-color: var(--violet); }
    .metric strong { display: block; font-size: 29px; line-height: 1.1; }
    .metric span { color: var(--muted); font-size: 13px; }
    .card-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
    }
    .service-card, .solution-card, .review-card, .case-card, .article-card {
      background: var(--surface);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      box-shadow: 0 5px 18px rgba(18, 56, 68, .04);
      transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
    }
    .service-card:hover, .solution-card:hover, .review-card:hover, .case-card:hover, .article-card:hover {
      transform: translateY(-5px);
      border-color: var(--cyan);
      box-shadow: var(--shadow);
    }
    .service-card { padding: 22px; min-height: 210px; }
    .service-card .num {
      color: var(--pink);
      font-weight: 900;
      font-size: 14px;
    }
    .service-card h3 { margin: 12px 0 8px; font-size: 19px; }
    .service-card p, .solution-card p, .case-card p, .article-card p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .tag-row, .model-cloud { display: flex; flex-wrap: wrap; gap: 9px; }
    .tag {
      display: inline-flex;
      padding: 6px 10px;
      border-radius: 999px;
      background: #e5f8f5;
      color: #12636b;
      font-size: 13px;
    }
    .tag:nth-child(3n) { background: #fff0f6; color: #a3275e; }
    .tag:nth-child(4n) { background: #f1f2ff; color: #4d48a0; }
    .flow {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 0;
      border-top: 2px solid var(--cyan);
    }
    .flow-step {
      position: relative;
      padding: 28px 18px 8px;
      border-right: 1px dashed #b9d7d4;
    }
    .flow-step:last-child { border-right: 0; }
    .flow-step b {
      position: absolute;
      top: -15px;
      left: 18px;
      width: 28px;
      height: 28px;
      display: grid;
      place-items: center;
      background: var(--lime);
      color: #27340d;
      border-radius: 50%;
      font-size: 13px;
    }
    .flow-step h3 { font-size: 17px; margin-bottom: 8px; }
    .flow-step p { font-size: 13px; color: var(--muted); margin: 0; }
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 18px;
    }
    .solution-card { padding: 22px; }
    .solution-card h3 { margin: 0 0 8px; font-size: 19px; }
    .solution-card .solution-label { color: var(--cyan-dark); font-size: 12px; font-weight: 800; }
    .table-wrap {
      overflow-x: auto;
      background: var(--surface);
      border: 1px solid var(--line);
      box-shadow: var(--shadow);
      border-radius: 15px;
    }
    table { width: 100%; min-width: 760px; border-collapse: collapse; }
    th, td { padding: 17px 18px; text-align: left; border-bottom: 1px solid var(--line); }
    th { background: #e5f8f5; color: #185a61; font-size: 14px; }
    td { color: var(--muted); font-size: 14px; }
    td:first-child { color: var(--ink); font-weight: 800; }
    tr:last-child td { border-bottom: 0; }
    .score-panel {
      display: grid;
      grid-template-columns: .8fr 1.2fr;
      gap: 24px;
      align-items: stretch;
      margin-bottom: 24px;
    }
    .score-box {
      padding: 27px;
      background: var(--ink);
      color: white;
      border-radius: 16px;
      border-left: 7px solid var(--lime);
    }
    .score-box strong { display: block; color: var(--lime); font-size: 58px; line-height: 1; }
    .score-box span { color: #c8d7dd; }
    .score-box .stars { color: var(--yellow); font-size: 23px; letter-spacing: 3px; margin: 13px 0; }
    .benefit-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 12px;
    }
    .benefit {
      padding: 16px;
      background: var(--surface);
      border: 1px solid var(--line);
      border-radius: 10px;
    }
    .benefit b { display: block; margin-bottom: 4px; }
    .benefit span { color: var(--muted); font-size: 13px; }
    .case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .case-card { overflow: hidden; }
    .case-card figure { margin: 0; background: #dff1ed; aspect-ratio: 16 / 8; overflow: hidden; }
    .case-card figure img { width: 100%; height: 100%; object-fit: cover; }
    .case-card-body { padding: 19px; }
    .case-card h3 { margin: 0 0 7px; font-size: 19px; }
    .article-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 13px; }
    .article-card { padding: 18px; min-height: 155px; }
    .article-card h3 { font-size: 16px; line-height: 1.45; margin: 0 0 9px; }
    .article-card .read { display: inline-block; margin-top: 13px; color: var(--cyan-dark); font-weight: 800; font-size: 13px; }
    .review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
    .review-card { padding: 22px; }
    .review-card .quote { color: var(--ink); font-size: 15px; margin-bottom: 18px; }
    .review-card .person { color: var(--muted); font-size: 13px; border-top: 1px solid var(--line); padding-top: 13px; }
    .review-card .stars { color: #e2a900; font-size: 16px; }
    .faq-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 11px 20px; }
    details {
      background: var(--surface);
      border: 1px solid var(--line);
      border-radius: 10px;
      padding: 0 18px;
    }
    details[open] { border-color: var(--cyan); }
    summary {
      cursor: pointer;
      list-style: none;
      padding: 16px 26px 16px 0;
      font-weight: 800;
      position: relative;
    }
    summary::-webkit-details-marker { display: none; }
    summary:after {
      content: "+";
      position: absolute;
      right: 0;
      color: var(--cyan-dark);
      font-size: 22px;
      top: 12px;
    }
    details[open] summary:after { content: "−"; }
    details p { color: var(--muted); font-size: 14px; padding: 0 0 16px; margin: 0; }
    .form-layout {
      display: grid;
      grid-template-columns: .75fr 1.25fr;
      gap: 32px;
      align-items: start;
    }
    .contact-aside {
      padding: 28px;
      background: var(--ink);
      color: white;
      border-radius: 16px;
      border-right: 7px solid var(--pink);
    }
    .contact-aside h2 { font-size: 30px; margin-bottom: 12px; }
    .contact-aside p { color: #c8d7dd; }
    .contact-list { display: grid; gap: 10px; margin-top: 22px; }
    .contact-list div { padding: 11px 0; border-top: 1px solid rgba(255,255,255,.15); color: #e4f0f1; font-size: 14px; }
    .contact-form {
      padding: 28px;
      background: var(--surface);
      border: 1px solid var(--line);
      border-radius: 16px;
      box-shadow: var(--shadow);
    }
    .field-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .field { display: grid; gap: 7px; margin-bottom: 16px; }
    .field.full { grid-column: 1 / -1; }
    label { color: var(--ink); font-size: 14px; font-weight: 800; }
    input, select, textarea {
      width: 100%;
      border: 1px solid #cbdedb;
      border-radius: 8px;
      background: #fbfefd;
      color: var(--ink);
      padding: 12px 13px;
      outline: none;
    }
    input:focus, select:focus, textarea:focus { border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(0,184,200,.12); }
    textarea { min-height: 128px; resize: vertical; }
    .resource-strip {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      margin-top: 28px;
    }
    .resource-strip figure { margin: 0; border-radius: 12px; overflow: hidden; background: #d9eee9; }
    .resource-strip figure img { width: 100%; aspect-ratio: 16 / 8; object-fit: cover; }
    .qr-box {
      display: flex;
      align-items: center;
      gap: 18px;
      padding: 20px;
      background: #fff6fa;
      border: 1px solid #ffd3e4;
      border-radius: 13px;
      margin-top: 22px;
    }
    .qr-box img { width: 104px; border-radius: 8px; }
    .qr-box p { margin: 0; color: #6b4055; font-size: 13px; }
    .footer {
      padding: 48px 0 24px;
      background: #152332;
      color: #eff8f7;
    }
    .footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 35px; }
    .footer h2, .footer h3 { margin: 0 0 14px; }
    .footer p, .footer a { color: #b9ccd1; font-size: 14px; }
    .footer a:hover { color: var(--lime); }
    .footer-links { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px 14px; }
    .copyright { margin-top: 34px; padding-top: 18px; border-top: 1px solid rgba(255,255,255,.15); color: #9bb0b7; font-size: 12px; }
    .float-actions {
      position: fixed;
      right: 18px;
      bottom: 18px;
      z-index: 15;
      display: grid;
      gap: 9px;
    }
    .float-actions a {
      display: grid;
      place-items: center;
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: var(--ink);
      color: var(--lime);
      border: 2px solid var(--lime);
      font-size: 12px;
      font-weight: 900;
      box-shadow: 0 8px 20px rgba(18,56,68,.2);
    }
    .reveal { opacity: 0; transform: translateY(16px); transition: opacity .6s ease, transform .6s ease; }
    .reveal.visible { opacity: 1; transform: none; }
    @media (max-width: 1040px) {
      .nav-links a { padding: 7px 6px; font-size: 12px; }
      .hero-grid, .intro-layout, .form-layout { grid-template-columns: 1fr; }
      .hero-panel { max-width: 620px; }
      .card-grid { grid-template-columns: repeat(2, 1fr); }
      .article-grid { grid-template-columns: repeat(3, 1fr); }
    }
    @media (max-width: 760px) {
      .container { width: min(var(--container), calc(100% - 28px)); }
      .site-header { position: relative; }
      .nav-wrap { min-height: 66px; }
      .menu-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 42px;
        height: 38px;
        background: var(--ink);
        color: white;
        border: 0;
        border-radius: 7px;
        cursor: pointer;
      }
      .nav-links {
        display: none;
        position: absolute;
        left: 14px;
        right: 14px;
        top: 66px;
        padding: 10px;
        background: var(--surface);
        border: 1px solid var(--line);
        box-shadow: var(--shadow);
        border-radius: 12px;
        flex-direction: column;
        align-items: stretch;
      }
      .nav-links.open { display: flex; }
      .nav-links a { padding: 10px 12px; font-size: 14px; }
      .hero { padding: 65px 0 62px; }
      h1 { font-size: 42px; }
      .hero-copy { font-size: 16px; }
      .section { padding: 62px 0; }
      .section-head { display: block; }
      .section-head p { margin-top: 15px; }
      .card-grid, .solution-grid, .case-grid, .review-grid, .faq-grid, .benefit-list, .resource-strip, .footer-grid { grid-template-columns: 1fr; }
      .flow { display: grid; grid-template-columns: 1fr; border-top: 0; border-left: 2px solid var(--cyan); margin-left: 10px; }
      .flow-step { padding: 16px 12px 22px 28px; border-right: 0; border-bottom: 1px dashed #b9d7d4; }
      .flow-step b { left: -15px; top: 18px; }
      .score-panel { grid-template-columns: 1fr; }
      .article-grid { grid-template-columns: repeat(2, 1fr); }
      .field-grid { grid-template-columns: 1fr; gap: 0; }
      .field.full { grid-column: auto; }
      .contact-form, .contact-aside { padding: 22px; }
      .footer-links { grid-template-columns: 1fr 1fr; }
    }
    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      *, *:before, *:after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
    }