:root {
      --ink: #18212b;
      --muted: #64707b;
      --yellow: #f7c928;
      --yellow-deep: #dca900;
      --paper: #fffdf7;
      --soft: #f6f3e8;
      --line: #e6e0d0;
      --navy: #172938;
      --teal: #168c88;
      --coral: #e86b52;
      --white: #ffffff;
      --shadow: 0 18px 45px rgba(23, 41, 56, .09);
      --container: 1180px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", 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-inline: auto;
    }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(255, 253, 247, .94);
      border-bottom: 1px solid rgba(230, 224, 208, .85);
      backdrop-filter: blur(14px);
    }
    .nav-shell {
      min-height: 76px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }
    .brand {
      display: inline-flex;
      align-items: center;
      min-width: 170px;
      gap: 11px;
      font-weight: 800;
      letter-spacing: 0;
    }
    .ai-page-logo { width: 42px; height: 42px; object-fit: contain; }
    .brand-text { font-size: 18px; }
    .brand-text small {
      display: block;
      color: var(--muted);
      font-size: 10px;
      font-weight: 600;
      line-height: 1.3;
      letter-spacing: 1px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 0;
      flex-wrap: wrap;
    }
    .nav-links a {
      padding: 8px 10px;
      color: #4f5b65;
      font-size: 13px;
      transition: color .2s ease, transform .2s ease;
    }
    .nav-links a:hover { color: var(--ink); transform: translateY(-2px); }
    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: var(--ink);
      color: var(--white) !important;
      border-radius: 4px;
      padding: 10px 16px !important;
      margin-left: 10px;
      font-weight: 700;
    }
    .menu-toggle {
      display: none;
      border: 1px solid var(--line);
      background: var(--white);
      color: var(--ink);
      padding: 8px 11px;
      border-radius: 4px;
      cursor: pointer;
    }
    .hero {
      position: relative;
      overflow: hidden;
      background: var(--yellow);
      min-height: 680px;
      display: flex;
      align-items: center;
    }
    .hero:before, .hero:after {
      content: "";
      position: absolute;
      border: 1px solid rgba(23, 41, 56, .2);
      transform: rotate(18deg);
      pointer-events: none;
    }
    .hero:before {
      width: 330px;
      height: 330px;
      right: -90px;
      top: -105px;
      border-radius: 42%;
    }
    .hero:after {
      width: 220px;
      height: 220px;
      left: -100px;
      bottom: -100px;
      border-radius: 50%;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 1.12fr) minmax(340px, .88fr);
      gap: 70px;
      align-items: center;
      padding: 92px 0 80px;
    }
    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: var(--navy);
      font-size: 13px;
      font-weight: 800;
      letter-spacing: 1px;
      text-transform: uppercase;
    }
    .eyebrow:before {
      content: "";
      width: 28px;
      height: 3px;
      background: var(--navy);
    }
    h1, h2, h3, p { margin-top: 0; }
    h1 {
      max-width: 700px;
      margin: 18px 0 22px;
      font-size: clamp(42px, 6vw, 76px);
      line-height: 1.08;
      letter-spacing: 0;
    }
    .hero-copy {
      max-width: 630px;
      color: #263746;
      font-size: 18px;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 32px;
    }
    .button {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 46px;
      padding: 11px 20px;
      border: 1px solid var(--ink);
      border-radius: 4px;
      font-weight: 800;
      cursor: pointer;
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    }
    .button:hover { transform: translateY(-3px); box-shadow: 0 9px 18px rgba(23, 41, 56, .15); }
    .button-dark { background: var(--ink); color: var(--white); }
    .button-light { background: rgba(255,255,255,.55); color: var(--ink); }
    .hero-note {
      margin-top: 20px;
      color: #4e4a35;
      font-size: 13px;
    }
    .hero-panel {
      position: relative;
      padding: 26px;
      background: var(--navy);
      color: var(--white);
      border-radius: 8px;
      box-shadow: 18px 18px 0 rgba(23, 41, 56, .13);
      animation: rise .8s ease both;
    }
    .hero-panel:after {
      content: "AI";
      position: absolute;
      right: 22px;
      top: 10px;
      color: rgba(255,255,255,.08);
      font-size: 110px;
      line-height: 1;
      font-weight: 900;
    }
    .panel-label {
      position: relative;
      z-index: 1;
      color: var(--yellow);
      font-size: 12px;
      font-weight: 800;
      letter-spacing: 1px;
    }
    .hero-panel h2 {
      position: relative;
      z-index: 1;
      max-width: 330px;
      margin: 16px 0 24px;
      font-size: 28px;
      line-height: 1.3;
    }
    .metric-list {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 1px;
      background: rgba(255,255,255,.16);
      border: 1px solid rgba(255,255,255,.16);
    }
    .metric-list div {
      padding: 16px;
      background: rgba(23,41,56,.82);
    }
    .metric-list strong { display: block; color: var(--yellow); font-size: 26px; line-height: 1.1; }
    .metric-list span { color: #d1d9dd; font-size: 12px; }
    .section { padding: 100px 0; }
    .section-soft { background: var(--soft); }
    .section-dark { background: var(--navy); color: var(--white); }
    .section-heading {
      display: flex;
      align-items: end;
      justify-content: space-between;
      gap: 30px;
      margin-bottom: 42px;
    }
    .section-heading h2 {
      max-width: 680px;
      margin: 10px 0 0;
      font-size: clamp(30px, 4vw, 48px);
      line-height: 1.18;
    }
    .section-heading p {
      max-width: 430px;
      margin: 0;
      color: var(--muted);
    }
    .section-dark .section-heading p { color: #bcc8ce; }
    .about-layout {
      display: grid;
      grid-template-columns: .9fr 1.1fr;
      gap: 60px;
      align-items: start;
    }
    .about-lead {
      padding-left: 22px;
      border-left: 5px solid var(--yellow);
      font-size: 21px;
      font-weight: 650;
      line-height: 1.55;
    }
    .about-text { color: var(--muted); }
    .stats-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 1px;
      margin-top: 46px;
      background: var(--line);
      border: 1px solid var(--line);
    }
    .stat {
      padding: 22px;
      background: var(--paper);
    }
    .stat strong { display: block; font-size: 34px; color: var(--teal); line-height: 1.1; }
    .stat span { display: block; margin-top: 6px; color: var(--muted); font-size: 13px; }
    .service-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
    }
    .service-card {
      position: relative;
      min-height: 240px;
      padding: 24px;
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: 6px;
      transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
    }
    .service-card:hover { transform: translateY(-6px); border-color: var(--yellow-deep); box-shadow: var(--shadow); }
    .service-card:nth-child(3n) { background: #f0f7f4; }
    .service-card:nth-child(4n) { background: #fff6df; }
    .service-index { color: var(--coral); font-size: 12px; font-weight: 900; letter-spacing: 1px; }
    .service-card h3 { margin: 22px 0 10px; font-size: 21px; }
    .service-card p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .service-tag {
      position: absolute;
      right: 18px;
      top: 20px;
      color: var(--teal);
      font-size: 20px;
      font-weight: 900;
    }
    .production-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 70px;
      align-items: center;
    }
    .process-list { display: grid; gap: 18px; }
    .process-item {
      display: grid;
      grid-template-columns: 54px 1fr;
      gap: 18px;
      align-items: start;
      padding-bottom: 18px;
      border-bottom: 1px solid var(--line);
    }
    .process-number {
      display: grid;
      place-items: center;
      width: 44px;
      height: 44px;
      background: var(--yellow);
      border-radius: 50%;
      font-weight: 900;
    }
    .process-item h3 { margin: 0 0 4px; font-size: 18px; }
    .process-item p { margin: 0; color: var(--muted); font-size: 14px; }
    .workflow-board {
      padding: 28px;
      background: #fff8dc;
      border: 1px solid #ecd991;
      border-radius: 8px;
    }
    .workflow-board h3 { margin-bottom: 22px; font-size: 24px; }
    .workflow-flow {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
    }
    .flow-box {
      min-height: 105px;
      padding: 15px;
      background: var(--white);
      border: 1px solid #eadfba;
      border-radius: 4px;
    }
    .flow-box strong { display: block; margin-bottom: 6px; }
    .flow-box span { color: var(--muted); font-size: 12px; }
    .solution-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 18px;
    }
    .solution-card {
      padding: 27px;
      background: var(--white);
      border-top: 4px solid var(--teal);
      box-shadow: 0 7px 20px rgba(23,41,56,.05);
    }
    .solution-card:nth-child(2) { border-color: var(--coral); }
    .solution-card:nth-child(3) { border-color: var(--yellow-deep); }
    .solution-card h3 { margin-bottom: 10px; }
    .solution-card p { margin-bottom: 0; color: var(--muted); font-size: 14px; }
    .network-wrap {
      display: grid;
      grid-template-columns: .85fr 1.15fr;
      gap: 60px;
      align-items: center;
    }
    .network-list {
      display: flex;
      flex-wrap: wrap;
      gap: 9px;
    }
    .network-list span, .tag-cloud span {
      display: inline-flex;
      padding: 8px 12px;
      background: rgba(255,255,255,.09);
      border: 1px solid rgba(255,255,255,.2);
      color: #e5edf0;
      border-radius: 3px;
      font-size: 13px;
    }
    .network-copy { color: #bcc8ce; }
    .timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      border-top: 2px solid var(--yellow);
      gap: 22px;
    }
    .timeline-step { position: relative; padding-top: 28px; }
    .timeline-step:before {
      content: "";
      position: absolute;
      top: -9px;
      left: 0;
      width: 15px;
      height: 15px;
      background: var(--yellow);
      border: 3px solid var(--navy);
      border-radius: 50%;
    }
    .timeline-step strong { display: block; margin-bottom: 8px; color: var(--yellow); }
    .timeline-step p { color: #bcc8ce; margin: 0; font-size: 14px; }
    .case-grid {
      display: grid;
      grid-template-columns: 1.2fr .8fr .8fr;
      gap: 16px;
    }
    .case-card {
      overflow: hidden;
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: 6px;
    }
    .case-card.featured { grid-row: span 2; }
    .media-frame {
      display: flex;
      align-items: center;
      justify-content: center;
      aspect-ratio: 16 / 9;
      overflow: hidden;
      background: #ece8dc;
    }
    .case-card:not(.featured) .media-frame { aspect-ratio: 4 / 3; }
    .media-frame img { width: 100%; height: 100%; object-fit: cover; }
    .case-info { padding: 20px; }
    .case-info h3 { margin-bottom: 7px; font-size: 20px; }
    .case-info p { margin: 0; color: var(--muted); font-size: 14px; }
    .compare-layout {
      display: grid;
      grid-template-columns: .72fr 1.28fr;
      gap: 40px;
      align-items: start;
    }
    .score-box {
      padding: 28px;
      background: var(--yellow);
      border-radius: 7px;
    }
    .score-box .stars { color: var(--navy); font-size: 27px; letter-spacing: 4px; }
    .score-box strong { display: block; margin: 15px 0 5px; font-size: 60px; line-height: 1; }
    .score-box span { color: #5e511f; font-size: 13px; }
    .table-wrap { overflow-x: auto; background: var(--white); border: 1px solid var(--line); }
    table { width: 100%; min-width: 650px; border-collapse: collapse; }
    th, td { padding: 15px 16px; text-align: left; border-bottom: 1px solid var(--line); font-size: 14px; }
    th { background: #f4f0e4; color: var(--muted); font-weight: 700; }
    td:first-child { font-weight: 700; }
    .yes { color: var(--teal); font-weight: 900; }
    .price-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
    }
    .price-card {
      padding: 25px;
      border: 1px solid rgba(255,255,255,.18);
      background: rgba(255,255,255,.06);
      border-radius: 5px;
    }
    .price-card h3 { color: var(--yellow); margin-bottom: 10px; }
    .price-card p { color: #bcc8ce; font-size: 14px; }
    .price-card strong { font-size: 27px; color: var(--white); }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
    .tag-cloud span:nth-child(3n) { color: var(--yellow); }
    .reviews {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
    }
    .review {
      padding: 24px;
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: 5px;
    }
    .review p { color: #46535c; font-size: 15px; }
    .review footer { display: flex; align-items: center; justify-content: space-between; gap: 10px; color: var(--muted); font-size: 12px; }
    .review .stars { color: var(--yellow-deep); letter-spacing: 2px; }
    .faq-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 11px 30px;
    }
    details { border-bottom: 1px solid var(--line); }
    summary {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      padding: 18px 0;
      cursor: pointer;
      list-style: none;
      font-weight: 750;
    }
    summary::-webkit-details-marker { display: none; }
    summary:after { content: "+"; color: var(--teal); font-size: 24px; font-weight: 400; }
    details[open] summary:after { content: "−"; }
    details p { margin: 0 32px 18px 0; color: var(--muted); font-size: 14px; }
    .article-grid {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 12px;
    }
    .article-card {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      min-height: 180px;
      padding: 20px;
      background: var(--white);
      border: 1px solid var(--line);
      transition: transform .2s ease, box-shadow .2s ease;
    }
    .article-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
    .article-card span { color: var(--coral); font-size: 12px; font-weight: 800; }
    .article-card h3 { margin: 20px 0 0; font-size: 17px; line-height: 1.45; }
    .contact-layout {
      display: grid;
      grid-template-columns: .8fr 1.2fr;
      gap: 60px;
      align-items: start;
    }
    .contact-list { display: grid; gap: 14px; margin-top: 26px; }
    .contact-item {
      padding: 15px 0;
      border-bottom: 1px solid var(--line);
    }
    .contact-item strong { display: block; font-size: 13px; color: var(--teal); }
    .contact-item span { color: var(--muted); }
    .form-card {
      padding: 30px;
      background: #fff8dc;
      border: 1px solid #ecd991;
      border-radius: 7px;
    }
    .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }
    .field { display: grid; gap: 7px; }
    .field.full { grid-column: 1 / -1; }
    label { font-size: 13px; font-weight: 750; }
    input, select, textarea {
      width: 100%;
      border: 1px solid #d9cfad;
      border-radius: 4px;
      background: var(--white);
      color: var(--ink);
      padding: 12px 13px;
      outline: none;
    }
    input:focus, select:focus, textarea:focus { border-color: var(--teal); box-shadow: 0 0 0 3px rgba(22,140,136,.12); }
    textarea { min-height: 125px; resize: vertical; }
    .form-submit { margin-top: 18px; }
    .join-band {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 28px;
      padding: 28px 30px;
      background: var(--yellow);
      border-radius: 6px;
    }
    .join-band h2 { margin: 0 0 6px; font-size: 27px; }
    .join-band p { margin: 0; color: #5f521e; }
    .site-footer {
      background: #111d27;
      color: #d6e0e2;
      padding: 52px 0 24px;
    }
    .footer-top {
      display: grid;
      grid-template-columns: 1.1fr .8fr 1fr;
      gap: 45px;
      padding-bottom: 36px;
      border-bottom: 1px solid rgba(255,255,255,.15);
    }
    .footer-brand { color: var(--white); font-size: 20px; font-weight: 800; }
    .footer-top p { color: #a9b9bf; font-size: 13px; }
    .footer-title { margin-bottom: 12px; color: var(--yellow); font-size: 13px; font-weight: 800; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 8px 14px; }
    .footer-links a { color: #c4d0d3; font-size: 13px; }
    .footer-links a:hover { color: var(--yellow); }
    .footer-bottom {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      padding-top: 20px;
      color: #91a3aa;
      font-size: 12px;
    }
    .qr {
      width: 100px;
      margin-top: 10px;
      border: 5px solid var(--white);
    }
    .float-tools {
      position: fixed;
      right: 22px;
      bottom: 22px;
      z-index: 15;
      display: grid;
      gap: 8px;
    }
    .float-tools a, .float-tools button {
      display: grid;
      place-items: center;
      width: 48px;
      height: 48px;
      border: 1px solid var(--line);
      border-radius: 50%;
      background: var(--white);
      color: var(--ink);
      box-shadow: 0 8px 20px rgba(23,41,56,.15);
      cursor: pointer;
      font-size: 13px;
    }
    .float-tools a:first-child { background: var(--yellow); border-color: var(--yellow); }
    .reveal { opacity: 0; transform: translateY(22px); transition: opacity .65s ease, transform .65s ease; }
    .reveal.visible { opacity: 1; transform: translateY(0); }
    @keyframes rise { from { opacity: 0; transform: translateY(22px); } to { opacity: 1; transform: translateY(0); } }
    @media (max-width: 980px) {
      .nav-links a { padding-inline: 6px; font-size: 12px; }
      .hero-grid, .about-layout, .production-layout, .network-wrap, .compare-layout, .contact-layout { grid-template-columns: 1fr; }
      .hero-grid { gap: 38px; }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .case-grid { grid-template-columns: repeat(2, 1fr); }
      .case-card.featured { grid-row: auto; }
      .article-grid { grid-template-columns: repeat(3, 1fr); }
      .footer-top { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 680px) {
      .container { width: min(var(--container), calc(100% - 28px)); }
      .site-header { position: relative; }
      .nav-shell { min-height: 68px; }
      .menu-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 68px;
        left: 14px;
        right: 14px;
        padding: 10px;
        background: var(--paper);
        border: 1px solid var(--line);
        box-shadow: var(--shadow);
      }
      .nav-links.open { display: grid; grid-template-columns: repeat(2, 1fr); }
      .nav-links a { padding: 10px; }
      .nav-cta { margin-left: 0; }
      .hero { min-height: 620px; }
      .hero-grid { padding: 68px 0 58px; }
      h1 { font-size: 44px; }
      .hero-copy { font-size: 16px; }
      .section { padding: 70px 0; }
      .section-heading { display: block; margin-bottom: 30px; }
      .section-heading p { margin-top: 16px; }
      .stats-row, .service-grid, .solution-grid, .reviews, .faq-grid, .price-grid { grid-template-columns: 1fr; }
      .workflow-flow { grid-template-columns: 1fr; }
      .timeline { grid-template-columns: 1fr 1fr; row-gap: 32px; }
      .case-grid { grid-template-columns: 1fr; }
      .article-grid { grid-template-columns: 1fr 1fr; }
      .form-grid { grid-template-columns: 1fr; }
      .field.full { grid-column: auto; }
      .join-band { display: block; }
      .join-band .button { margin-top: 18px; }
      .footer-top { grid-template-columns: 1fr; gap: 25px; }
      .footer-bottom { display: block; }
      .footer-bottom span { display: block; margin-top: 8px; }
      .float-tools { right: 14px; bottom: 14px; }
    }