/* roulang page: index */
:root {
      --bg-dark: #0F141C;
      --bg-dark-card: #161D28;
      --bg-dark-border: rgba(255, 255, 255, 0.08);
      --bg-light: #F8FAFC;
      --bg-light-alt: #F1F5F9;
      --brand-green: #00D285;
      --brand-green-hover: #00B371;
      --brand-orange: #FF5E1E;
      --brand-orange-hover: #E44E13;
      --text-dark: #0F172A;
      --text-gray: #475569;
      --text-light: #F1F5F9;
      --text-muted: #94A3B8;
      --border-light: #E2E8F0;
      --radius: 6px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -1px rgba(0,0,0,0.04);
      --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
      --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    }

    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      text-size-adjust: 100%;
    }

    body {
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.65;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    .container {
      width: 100%;
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 顶部与导航 */
    .top-bar {
      background: #090D13;
      color: #8E9BAE;
      font-size: 13px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
      padding: 7px 0;
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .top-bar-left, .top-bar-right {
      display: flex;
      gap: 20px;
      align-items: center;
    }
    .top-bar span {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .top-bar .tag-code {
      font-family: var(--font-mono);
      color: var(--brand-green);
    }

    header.main-header {
      position: sticky;
      top: 0;
      z-index: 999;
      background: rgba(15, 20, 28, 0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--bg-dark-border);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 700;
      color: #FFFFFF;
      letter-spacing: 0.5px;
    }
    .brand-logo-icon {
      width: 34px;
      height: 34px;
      background: linear-gradient(135deg, var(--brand-green), #0891B2);
      border-radius: 4px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #0F141C;
      font-weight: 900;
      font-size: 16px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-links a {
      color: #CBD5E1;
      font-size: 15px;
      font-weight: 500;
      position: relative;
      padding: 6px 0;
    }
    .nav-links a:hover {
      color: #FFFFFF;
    }
    .nav-links a.active::after,
    .nav-links a:hover::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--brand-green);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .btn-nav-cta {
      background: var(--brand-orange);
      color: #FFFFFF;
      padding: 9px 20px;
      border-radius: var(--radius);
      font-size: 14px;
      font-weight: 600;
      border: 1px solid rgba(255,255,255,0.1);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .btn-nav-cta:hover {
      background: var(--brand-orange-hover);
      transform: translateY(-2px);
    }

    /* 移动端菜单按钮 */
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: #FFFFFF;
      margin: 5px 0;
      transition: all 0.3s;
    }

    /* 按钮基础 */
    .btn-primary {
      background: var(--brand-orange);
      color: #FFFFFF;
      padding: 13px 28px;
      border-radius: var(--radius);
      font-size: 15px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(255, 94, 30, 0.35);
    }
    .btn-primary:hover {
      background: var(--brand-orange-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(255, 94, 30, 0.45);
    }
    .btn-secondary {
      background: rgba(255, 255, 255, 0.1);
      color: #FFFFFF;
      padding: 13px 26px;
      border-radius: var(--radius);
      font-size: 15px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: 1px solid rgba(255, 255, 255, 0.2);
    }
    .btn-secondary:hover {
      background: rgba(255, 255, 255, 0.18);
      border-color: rgba(255, 255, 255, 0.4);
      transform: translateY(-2px);
    }

    /* 板块通用 */
    section {
      padding: 84px 0;
      position: relative;
    }
    .section-dark {
      background: var(--bg-dark);
      color: var(--text-light);
    }
    .section-light {
      background: var(--bg-light);
      color: var(--text-dark);
    }
    .section-light-alt {
      background: var(--bg-light-alt);
      color: var(--text-dark);
    }
    .section-header {
      margin-bottom: 48px;
    }
    .section-header.text-center {
      text-align: center;
      max-width: 820px;
      margin-left: auto;
      margin-right: auto;
    }
    .badge-sub {
      display: inline-block;
      font-family: var(--font-mono);
      font-size: 12px;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      padding: 4px 10px;
      border-radius: 4px;
      margin-bottom: 12px;
      font-weight: 700;
    }
    .section-dark .badge-sub {
      background: rgba(0, 210, 133, 0.12);
      color: var(--brand-green);
      border: 1px solid rgba(0, 210, 133, 0.25);
    }
    .section-light .badge-sub,
    .section-light-alt .badge-sub {
      background: rgba(15, 20, 28, 0.06);
      color: #0F766E;
      border: 1px solid rgba(15, 20, 28, 0.12);
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      line-height: 1.25;
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }
    .section-desc {
      font-size: 15px;
      line-height: 1.7;
      color: var(--text-muted);
    }
    .section-light .section-desc,
    .section-light-alt .section-desc {
      color: var(--text-gray);
    }

    /* 1. Hero 板块 */
    #hero {
      position: relative;
      padding: 100px 0 110px 0;
      background: linear-gradient(rgba(15, 20, 28, 0.88), rgba(15, 20, 28, 0.94)), url('/assets/images/60283ec149eba416.jpg') center/cover no-repeat;
      color: #FFFFFF;
      overflow: hidden;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }
    .hero-h1 {
      font-size: 44px;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-h1 span {
      color: var(--brand-green);
    }
    .hero-p {
      font-size: 16px;
      line-height: 1.75;
      color: #CBD5E1;
      margin-bottom: 32px;
      text-align: justify;
    }
    .hero-ctas {
      display: flex;
      gap: 16px;
      margin-bottom: 36px;
    }
    .hero-spec-strip {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 12px;
      padding-top: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.12);
    }
    .hero-spec-item strong {
      display: block;
      font-family: var(--font-mono);
      font-size: 20px;
      color: var(--brand-green);
      font-weight: 700;
    }
    .hero-spec-item span {
      font-size: 12px;
      color: #94A3B8;
    }
    .hero-stage {
      position: relative;
      border-radius: var(--radius);
      border: 1px solid var(--bg-dark-border);
      background: var(--bg-dark-card);
      overflow: hidden;
      box-shadow: 0 20px 35px -10px rgba(0, 0, 0, 0.6);
    }
    .hero-stage img {
      width: 100%;
      height: 380px;
      object-fit: cover;
      filter: contrast(1.05);
    }
    .stage-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      padding: 16px 20px;
      background: linear-gradient(transparent, rgba(15, 20, 28, 0.95));
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .stage-tag {
      font-size: 13px;
      font-family: var(--font-mono);
      color: #FFFFFF;
      background: rgba(0, 210, 133, 0.2);
      border: 1px solid var(--brand-green);
      padding: 3px 8px;
      border-radius: 3px;
    }

    /* 2. 数据看板看板 */
    #metrics-dashboard {
      padding: 60px 0;
      background: #0B0E14;
      border-bottom: 1px solid var(--bg-dark-border);
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .metric-card {
      background: var(--bg-dark-card);
      border: 1px solid var(--bg-dark-border);
      border-radius: var(--radius);
      padding: 24px 22px;
      position: relative;
      overflow: hidden;
      transition: all 0.2s ease;
    }
    .metric-card:hover {
      border-color: rgba(0, 210, 133, 0.35);
      transform: translateY(-2px);
    }
    .metric-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 4px;
      height: 100%;
      background: var(--brand-green);
    }
    .metric-num {
      font-family: var(--font-mono);
      font-size: 34px;
      font-weight: 800;
      color: #FFFFFF;
      line-height: 1.1;
      margin-bottom: 6px;
    }
    .metric-num span {
      font-size: 16px;
      font-weight: 500;
      color: var(--brand-green);
      margin-left: 4px;
    }
    .metric-label {
      font-size: 14px;
      font-weight: 600;
      color: #CBD5E1;
      margin-bottom: 4px;
    }
    .metric-desc {
      font-size: 12px;
      color: #64748B;
      line-height: 1.4;
    }

    /* 3. 研发体系 */
    #about-intro {
      background: #FFFFFF;
    }
    .about-wrap {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
    }
    .about-media {
      position: relative;
    }
    .about-media img {
      border-radius: var(--radius);
      box-shadow: var(--shadow-lg);
      width: 100%;
      height: 420px;
      object-fit: cover;
    }
    .about-floating-card {
      position: absolute;
      bottom: -20px;
      right: -20px;
      background: var(--bg-dark);
      color: #FFFFFF;
      padding: 20px 24px;
      border-radius: var(--radius);
      border: 1px solid var(--bg-dark-border);
      box-shadow: var(--shadow-lg);
      max-width: 280px;
    }
    .about-floating-card h4 {
      font-size: 14px;
      color: var(--brand-green);
      margin-bottom: 6px;
    }
    .about-floating-card p {
      font-size: 12px;
      color: #94A3B8;
      line-height: 1.5;
    }
    .about-content h2 {
      font-size: 30px;
      font-weight: 700;
      margin-bottom: 18px;
      color: var(--text-dark);
    }
    .about-content p {
      font-size: 15px;
      color: var(--text-gray);
      margin-bottom: 16px;
      line-height: 1.7;
    }
    .about-checkpoints {
      list-style: none;
      margin-top: 24px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 14px;
    }
    .about-checkpoints li {
      font-size: 14px;
      font-weight: 600;
      color: #1E293B;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .check-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--brand-green);
      display: inline-block;
    }

    /* 4. 核心优势六宫格 */
    #core-matrix {
      background: var(--bg-light-alt);
    }
    .matrix-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .matrix-card {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      padding: 30px 26px;
      position: relative;
      transition: all 0.2s ease;
      box-shadow: var(--shadow-sm);
    }
    .matrix-card:hover {
      border-color: #CBD5E1;
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
    }
    .matrix-index {
      font-family: var(--font-mono);
      font-size: 14px;
      font-weight: 700;
      color: #94A3B8;
      margin-bottom: 14px;
      display: inline-block;
      padding: 2px 8px;
      background: var(--bg-light-alt);
      border-radius: 4px;
    }
    .matrix-card h3 {
      font-size: 18px;
      font-weight: 700;
      color: #0F172A;
      margin-bottom: 10px;
    }
    .matrix-card p {
      font-size: 14px;
      color: var(--text-gray);
      line-height: 1.65;
    }

    /* 5. 热门产品矩阵 */
    #hot-products {
      background: #FFFFFF;
    }
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .product-card {
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      background: #FFFFFF;
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: all 0.2s ease;
    }
    .product-card:hover {
      border-color: #94A3B8;
      box-shadow: var(--shadow-lg);
      transform: translateY(-3px);
    }
    .product-img {
      position: relative;
      height: 230px;
      overflow: hidden;
      background: #0F141C;
    }
    .product-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .product-card:hover .product-img img {
      transform: scale(1.04);
    }
    .product-badge {
      position: absolute;
      top: 14px;
      right: 14px;
      background: rgba(15, 20, 28, 0.8);
      color: var(--brand-green);
      font-family: var(--font-mono);
      font-size: 12px;
      font-weight: 600;
      padding: 3px 8px;
      border-radius: 3px;
      border: 1px solid rgba(0, 210, 133, 0.4);
    }
    .product-body {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .product-body h3 {
      font-size: 19px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 8px;
    }
    .product-body p {
      font-size: 13.5px;
      color: var(--text-gray);
      margin-bottom: 20px;
      line-height: 1.6;
    }
    .product-specs {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 20px;
      margin-top: auto;
    }
    .spec-pill {
      background: var(--bg-light-alt);
      border: 1px solid var(--border-light);
      border-radius: 4px;
      padding: 4px 10px;
      font-size: 12px;
      font-family: var(--font-mono);
      color: #334155;
    }
    .btn-product {
      width: 100%;
      text-align: center;
      background: #0F172A;
      color: #FFFFFF;
      padding: 10px 0;
      border-radius: var(--radius);
      font-size: 14px;
      font-weight: 600;
      border: none;
    }
    .btn-product:hover {
      background: var(--brand-orange);
    }

    /* 6. 场景深度服务 */
    #scene-service {
      background: var(--bg-light-alt);
    }
    .scene-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .scene-card {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .scene-cover {
      height: 200px;
      overflow: hidden;
    }
    .scene-cover img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .scene-details {
      padding: 24px;
    }
    .scene-details h3 {
      font-size: 19px;
      font-weight: 700;
      color: #0F172A;
      margin-bottom: 10px;
    }
    .scene-details p {
      font-size: 14px;
      color: var(--text-gray);
      line-height: 1.65;
      margin-bottom: 16px;
    }
    .scene-features {
      border-top: 1px solid var(--border-light);
      padding-top: 14px;
    }
    .scene-features li {
      list-style: none;
      font-size: 13px;
      color: #475569;
      margin-bottom: 6px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .scene-features li::before {
      content: '■';
      color: var(--brand-green);
      font-size: 8px;
    }

    /* 7. 深色实测对比 */
    #contrast-dark {
      background: #0A0E14;
      border-top: 1px solid var(--bg-dark-border);
      border-bottom: 1px solid var(--bg-dark-border);
    }
    .table-container {
      overflow-x: auto;
      background: var(--bg-dark-card);
      border: 1px solid var(--bg-dark-border);
      border-radius: var(--radius);
    }
    .contrast-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }
    .contrast-table th, .contrast-table td {
      padding: 18px 22px;
      border-bottom: 1px solid var(--bg-dark-border);
    }
    .contrast-table th {
      background: rgba(255, 255, 255, 0.03);
      font-weight: 600;
      color: #CBD5E1;
    }
    .contrast-table th.highlight, .contrast-table td.highlight {
      background: rgba(0, 210, 133, 0.05);
      color: #FFFFFF;
      font-weight: 600;
    }
    .contrast-table td.highlight strong {
      color: var(--brand-green);
      font-family: var(--font-mono);
    }
    .contrast-table td {
      color: #94A3B8;
    }

    /* 8. 技术里程碑时间线 */
    #milestone {
      background: #FFFFFF;
    }
    .timeline {
      position: relative;
      max-width: 900px;
      margin: 0 auto;
      padding-left: 30px;
    }
    .timeline::before {
      content: '';
      position: absolute;
      top: 10px;
      bottom: 10px;
      left: 7px;
      width: 2px;
      background: #CBD5E1;
    }
    .timeline-item {
      position: relative;
      margin-bottom: 36px;
    }
    .timeline-item:last-child {
      margin-bottom: 0;
    }
    .timeline-item::before {
      content: '';
      position: absolute;
      left: -29px;
      top: 6px;
      width: 12px;
      height: 12px;
      border-radius: 50%;
      background: var(--brand-green);
      border: 3px solid #FFFFFF;
      box-shadow: 0 0 0 2px var(--brand-green);
    }
    .timeline-year {
      font-family: var(--font-mono);
      font-weight: 800;
      font-size: 16px;
      color: #0F172A;
      margin-bottom: 4px;
    }
    .timeline-content h4 {
      font-size: 16px;
      font-weight: 700;
      color: #1E293B;
      margin-bottom: 6px;
    }
    .timeline-content p {
      font-size: 14px;
      color: var(--text-gray);
      line-height: 1.6;
    }

    /* 9. 案例研究深色区 */
    #case-studies {
      background: var(--bg-dark);
    }
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    .case-card {
      background: var(--bg-dark-card);
      border: 1px solid var(--bg-dark-border);
      border-radius: var(--radius);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .case-media {
      height: 240px;
      overflow: hidden;
    }
    .case-media img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-body {
      padding: 26px;
      flex-grow: 1;
    }
    .case-body h3 {
      font-size: 19px;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 10px;
    }
    .case-body p {
      font-size: 14px;
      color: #94A3B8;
      line-height: 1.65;
      margin-bottom: 18px;
    }
    .case-metrics-badge {
      display: flex;
      gap: 16px;
      padding-top: 14px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }
    .case-metrics-badge div strong {
      display: block;
      font-family: var(--font-mono);
      font-size: 18px;
      color: var(--brand-green);
    }
    .case-metrics-badge div span {
      font-size: 12px;
      color: #64748B;
    }

    /* 10. 用户故事与一线口碑 */
    #user-stories {
      background: var(--bg-light-alt);
    }
    .stories-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 26px;
    }
    .story-card {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      padding: 28px;
      box-shadow: var(--shadow-sm);
    }
    .story-quote {
      font-size: 14px;
      color: #334155;
      line-height: 1.7;
      margin-bottom: 20px;
      position: relative;
    }
    .story-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-light);
      padding-top: 16px;
    }
    .story-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #E2E8F0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #475569;
      font-size: 14px;
    }
    .story-info strong {
      display: block;
      font-size: 14px;
      color: #0F172A;
    }
    .story-info span {
      font-size: 12px;
      color: #64748B;
    }

    /* 11. 行业动态 */
    #news-insights {
      background: #FFFFFF;
    }
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 26px;
    }
    .news-card {
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      padding: 24px;
      background: #FFFFFF;
      transition: all 0.2s ease;
    }
    .news-card:hover {
      border-color: #CBD5E1;
      box-shadow: var(--shadow-md);
    }
    .news-date {
      font-family: var(--font-mono);
      font-size: 12px;
      color: #64748B;
      margin-bottom: 8px;
    }
    .news-card h3 {
      font-size: 17px;
      font-weight: 700;
      color: #0F172A;
      margin-bottom: 10px;
      line-height: 1.45;
    }
    .news-card p {
      font-size: 13.5px;
      color: var(--text-gray);
      line-height: 1.6;
      margin-bottom: 14px;
    }
    .news-link {
      font-size: 13px;
      font-weight: 600;
      color: var(--brand-orange);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 12. 平台保障 */
    #assurance {
      background: #090D14;
      border-top: 1px solid var(--bg-dark-border);
      border-bottom: 1px solid var(--bg-dark-border);
    }
    .assurance-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 22px;
    }
    .assurance-item {
      background: var(--bg-dark-card);
      border: 1px solid var(--bg-dark-border);
      border-radius: var(--radius);
      padding: 24px;
      text-align: center;
    }
    .assurance-icon {
      font-family: var(--font-mono);
      font-size: 24px;
      color: var(--brand-green);
      margin-bottom: 14px;
      display: inline-block;
    }
    .assurance-item h4 {
      font-size: 16px;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 8px;
    }
    .assurance-item p {
      font-size: 13px;
      color: #94A3B8;
      line-height: 1.55;
    }

    /* 13. FAQ 手风琴 */
    #faq-accordion {
      background: var(--bg-light-alt);
    }
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    details.faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius);
      padding: 18px 24px;
      cursor: pointer;
      transition: all 0.2s ease;
    }
    details.faq-item[open] {
      border-color: #CBD5E1;
      box-shadow: var(--shadow-sm);
    }
    summary.faq-question {
      font-size: 16px;
      font-weight: 700;
      color: #0F172A;
      list-style: none;
      position: relative;
      padding-right: 30px;
    }
    summary.faq-question::-webkit-details-marker {
      display: none;
    }
    summary.faq-question::after {
      content: '+';
      position: absolute;
      right: 0;
      top: 50%;
      transform: translateY(-50%);
      font-size: 20px;
      font-weight: 400;
      color: #64748B;
      transition: transform 0.2s ease;
    }
    details[open] summary.faq-question::after {
      content: '−';
      color: var(--brand-orange);
    }
    .faq-answer {
      margin-top: 12px;
      padding-top: 12px;
      border-top: 1px solid var(--border-light);
      font-size: 14px;
      color: var(--text-gray);
      line-height: 1.65;
    }

    /* 14. 试算表单 */
    #lead-form {
      background: #FFFFFF;
    }
    .lead-box {
      max-width: 920px;
      margin: 0 auto;
      background: var(--bg-dark);
      border: 1px solid var(--bg-dark-border);
      border-radius: var(--radius);
      padding: 44px;
      color: #FFFFFF;
      box-shadow: var(--shadow-lg);
    }
    .lead-box-header {
      margin-bottom: 28px;
      text-align: center;
    }
    .lead-box-header h3 {
      font-size: 26px;
      font-weight: 700;
      margin-bottom: 10px;
    }
    .lead-box-header p {
      font-size: 14px;
      color: #94A3B8;
    }
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .form-group.full {
      grid-column: span 2;
    }
    .form-group label {
      font-size: 13px;
      font-weight: 600;
      color: #CBD5E1;
    }
    .form-control {
      background: #161D28;
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius);
      padding: 12px 14px;
      color: #FFFFFF;
      font-size: 14px;
      font-family: inherit;
    }
    .form-control:focus {
      outline: none;
      border-color: var(--brand-green);
      box-shadow: 0 0 0 2px rgba(0, 210, 133, 0.2);
    }
    select.form-control option {
      background: #161D28;
      color: #FFFFFF;
    }

    /* 页脚 */
    footer.site-footer {
      background: #090D13;
      color: #8E9BAE;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding: 64px 0 28px 0;
      font-size: 14px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1fr;
      gap: 48px;
      margin-bottom: 48px;
    }
    .footer-brand h4 {
      font-size: 20px;
      color: #FFFFFF;
      font-weight: 700;
      margin-bottom: 14px;
    }
    .footer-brand p {
      font-size: 13.5px;
      line-height: 1.65;
      color: #8E9BAE;
      margin-bottom: 16px;
    }
    .footer-col h5 {
      font-size: 15px;
      color: #FFFFFF;
      font-weight: 600;
      margin-bottom: 16px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      padding-bottom: 8px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a {
      color: #8E9BAE;
    }
    .footer-links a:hover {
      color: var(--brand-green);
    }
    .footer-contact li {
      list-style: none;
      margin-bottom: 8px;
      line-height: 1.5;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 12px;
      color: #64748B;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 36px;
      }
      .about-wrap {
        grid-template-columns: 1fr;
      }
      .about-floating-card {
        right: 0;
      }
      .matrix-grid, .products-grid, .scene-grid, .stories-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-grid, .assurance-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .top-bar {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #0F141C;
        flex-direction: column;
        padding: 20px 24px;
        gap: 16px;
        border-bottom: 1px solid var(--bg-dark-border);
      }
      .nav-links.show {
        display: flex;
      }
      .header-actions {
        display: none;
      }
      .hero-h1 {
        font-size: 32px;
      }
      .hero-spec-strip {
        grid-template-columns: repeat(2, 1fr);
      }
      .matrix-grid, .products-grid, .scene-grid, .stories-grid, .news-grid, .cases-grid {
        grid-template-columns: 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full {
        grid-column: span 1;
      }
      .lead-box {
        padding: 24px 18px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
    }

    @media (max-width: 520px) {
      .metrics-grid, .assurance-grid {
        grid-template-columns: 1fr;
      }
      .hero-ctas {
        flex-direction: column;
      }
      .btn-primary, .btn-secondary {
        width: 100%;
      }
    }