/* roulang page: index */
:root {
      --primary-bg: #0B132B;
      --surface-dark: #0F172A;
      --surface-light: #FFFFFF;
      --bg-alt: #F8FAFC;
      --brand-green: #10B981;
      --brand-cyan: #06B6D4;
      --brand-accent: #F59E0B;
      --text-main: #0F172A;
      --text-muted: #475569;
      --text-light: #94A3B8;
      --text-white: #F8FAFC;
      --border-color: rgba(16, 185, 129, 0.18);
      --border-light: #E2E8F0;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --radius-full: 9999px;
      --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.05);
      --shadow-md: 0 10px 30px -10px rgba(0, 0, 0, 0.08);
      --shadow-glow: 0 0 25px rgba(16, 185, 129, 0.15);
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.7;
      color: var(--text-main);
      background-color: #FFFFFF;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

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

    button, input, select, textarea {
      font-family: inherit;
      font-size: inherit;
    }

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部顶条 */
    .top-bar {
      background-color: #070B18;
      color: var(--text-light);
      font-size: 13px;
      height: 38px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    .top-bar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 100%;
    }

    .top-bar-left span {
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .top-bar-right {
      display: flex;
      gap: 20px;
    }

    .top-bar-right a:hover {
      color: var(--brand-green);
    }

    /* 主导航 */
    .header-main {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(11, 19, 43, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(16, 185, 129, 0.2);
      transition: var(--transition);
    }

    .header-main .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 72px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 20px;
      font-weight: 700;
      color: var(--text-white);
      letter-spacing: -0.5px;
    }

    .logo-icon {
      width: 34px;
      height: 34px;
      background: linear-gradient(135deg, var(--brand-green), var(--brand-cyan));
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #0B132B;
      font-weight: 900;
      font-size: 18px;
      box-shadow: 0 0 12px rgba(16, 185, 129, 0.5);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 28px;
    }

    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: #CBD5E1;
      position: relative;
      padding: 6px 0;
    }

    .nav-link:hover, .nav-link.active {
      color: var(--brand-green);
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: linear-gradient(90deg, var(--brand-green), var(--brand-cyan));
      transition: var(--transition);
    }

    .nav-link:hover::after, .nav-link.active::after {
      width: 100%;
    }

    .nav-cta {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      background: linear-gradient(135deg, var(--brand-green), var(--brand-cyan));
      color: #070B18;
      font-weight: 600;
      font-size: 14px;
      border-radius: var(--radius-full);
      box-shadow: 0 4px 14px rgba(16, 185, 129, 0.35);
      transition: var(--transition);
    }

    .nav-cta:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(16, 185, 129, 0.5);
      color: #070B18;
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--text-white);
      font-size: 24px;
      cursor: pointer;
    }

    /* 通用组件 */
    .section-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 14px;
      background: rgba(16, 185, 129, 0.1);
      border: 1px solid rgba(16, 185, 129, 0.3);
      color: var(--brand-green);
      font-size: 13px;
      font-weight: 600;
      border-radius: var(--radius-full);
      margin-bottom: 16px;
      letter-spacing: 0.5px;
    }

    .badge-dot {
      width: 8px;
      height: 8px;
      background-color: var(--brand-green);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--brand-green);
    }

    .section-title {
      font-size: 34px;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 16px;
      color: var(--text-main);
    }

    .section-title.dark {
      color: var(--text-white);
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
      max-width: 780px;
    }

    .section-desc.dark {
      color: #94A3B8;
    }

    .section-header {
      margin-bottom: 50px;
    }

    .section-header.center {
      text-align: center;
    }

    .section-header.center .section-desc {
      margin: 0 auto;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 13px 28px;
      font-size: 15px;
      font-weight: 600;
      border-radius: var(--radius-md);
      transition: var(--transition);
      cursor: pointer;
      border: none;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--brand-green) 0%, var(--brand-cyan) 100%);
      color: #070B18;
      box-shadow: 0 8px 20px rgba(16, 185, 129, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(16, 185, 129, 0.45);
      color: #070B18;
    }

    .btn-secondary {
      background: rgba(255, 255, 255, 0.08);
      color: var(--text-white);
      border: 1px solid rgba(255, 255, 255, 0.2);
    }

    .btn-secondary:hover {
      background: rgba(255, 255, 255, 0.15);
      border-color: var(--text-white);
      color: var(--text-white);
    }

    .btn-outline-dark {
      background: transparent;
      color: var(--text-main);
      border: 1px solid var(--border-light);
    }

    .btn-outline-dark:hover {
      background: var(--bg-alt);
      border-color: var(--text-muted);
    }

    /* Section 1: Hero 斜切视频官网版式 */
    .hero-section {
      position: relative;
      background: #070C1B;
      color: var(--text-white);
      padding: 110px 0 140px;
      overflow: hidden;
      clip-path: polygon(0 0, 100% 0, 100% calc(100% - 4vw), 0 100%);
    }

    .hero-bg-media {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: 1;
      opacity: 0.22;
      background-image: url('/assets/images/a38fcf69871f3f03.webp');
      background-size: cover;
      background-position: center;
      filter: saturate(1.2);
    }

    .hero-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: 2;
      background: radial-gradient(circle at 70% 30%, rgba(6, 182, 212, 0.15) 0%, rgba(7, 12, 27, 0.85) 60%, #070C1B 100%);
    }

    .hero-content {
      position: relative;
      z-index: 3;
      max-width: 860px;
    }

    .hero-title {
      font-size: 46px;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }

    .hero-title .gradient-text {
      background: linear-gradient(135deg, #10B981, #38BDF8);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-description {
      font-size: 17px;
      color: #94A3B8;
      line-height: 1.8;
      margin-bottom: 36px;
      text-align: justify;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 40px;
    }

    .video-play-btn {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      background: rgba(255, 255, 255, 0.06);
      border: 1px solid rgba(255, 255, 255, 0.15);
      color: var(--text-white);
      padding: 12px 24px;
      border-radius: var(--radius-md);
      font-size: 15px;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
    }

    .video-play-btn:hover {
      background: rgba(255, 255, 255, 0.12);
      border-color: var(--brand-green);
    }

    .play-icon-circle {
      width: 26px;
      height: 26px;
      border-radius: 50%;
      background: var(--brand-green);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #070C1B;
      font-size: 11px;
    }

    .hero-live-badge-group {
      display: flex;
      align-items: center;
      gap: 24px;
      padding-top: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
    }

    .live-metric-item {
      display: flex;
      flex-direction: column;
    }

    .live-metric-num {
      font-size: 22px;
      font-weight: 700;
      color: var(--text-white);
      font-family: monospace;
    }

    .live-metric-label {
      font-size: 12px;
      color: var(--text-light);
    }

    /* Section 2: 产线能力与架构 (About) */
    .section-about {
      padding: 90px 0;
      background: #FFFFFF;
    }

    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .about-image-card {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-light);
    }

    .about-image-card img {
      width: 100%;
      height: 420px;
      object-fit: cover;
    }

    .about-floating-badge {
      position: absolute;
      bottom: 20px;
      left: 20px;
      right: 20px;
      background: rgba(11, 19, 43, 0.9);
      backdrop-filter: blur(8px);
      padding: 16px 20px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(16, 185, 129, 0.3);
      color: var(--text-white);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .about-spec-list {
      list-style: none;
      margin: 24px 0 32px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }

    .about-spec-item {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      font-size: 14px;
      color: var(--text-muted);
    }

    .about-spec-item svg {
      width: 18px;
      height: 18px;
      flex-shrink: 0;
      fill: var(--brand-green);
      margin-top: 3px;
    }

    /* Section 3: 核心优势矩阵区 (Advantages 6卡片) */
    .section-advantages {
      padding: 90px 0;
      background: var(--bg-alt);
    }

    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .advantage-card {
      background: #FFFFFF;
      padding: 32px 28px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .advantage-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
      border-color: var(--brand-green);
    }

    .card-top {
      margin-bottom: 20px;
    }

    .card-icon-box {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-md);
      background: rgba(16, 185, 129, 0.12);
      color: var(--brand-green);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
      font-size: 20px;
      font-weight: 700;
    }

    .advantage-card h3 {
      font-size: 19px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .advantage-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    .card-data-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 10px;
      background: var(--bg-alt);
      border-radius: var(--radius-full);
      font-size: 12px;
      color: #0F766E;
      font-weight: 600;
      margin-top: 18px;
      width: fit-content;
    }

    /* Section 4: 热门产品与分析套件区 (Products 3卡片) */
    .section-products {
      padding: 90px 0;
      background: #FFFFFF;
    }

    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .product-card {
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      background: #FFFFFF;
    }

    .product-card:hover {
      border-color: var(--brand-cyan);
      box-shadow: var(--shadow-md);
    }

    .product-thumb {
      height: 200px;
      overflow: hidden;
      position: relative;
    }

    .product-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }

    .product-card:hover .product-thumb img {
      transform: scale(1.05);
    }

    .product-tag {
      position: absolute;
      top: 14px;
      right: 14px;
      background: rgba(11, 19, 43, 0.85);
      color: var(--brand-cyan);
      padding: 4px 12px;
      border-radius: var(--radius-full);
      font-size: 12px;
      font-weight: 600;
      border: 1px solid rgba(6, 182, 212, 0.3);
    }

    .product-body {
      padding: 28px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }

    .product-title {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .product-summary {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 20px;
    }

    .product-specs {
      list-style: none;
      margin-bottom: 24px;
      padding-top: 16px;
      border-top: 1px dashed var(--border-light);
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .product-specs li {
      font-size: 13px;
      color: var(--text-muted);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .product-specs li::before {
      content: '✓';
      color: var(--brand-green);
      font-weight: 700;
    }

    .product-footer {
      margin-top: auto;
    }

    /* Section 5: 深色案例与算法理念区 (Cases 对比) */
    .section-cases {
      padding: 90px 0;
      background: var(--surface-dark);
      color: var(--text-white);
      position: relative;
    }

    .compare-container {
      background: #0B132B;
      border-radius: var(--radius-lg);
      border: 1px solid rgba(16, 185, 129, 0.2);
      overflow: hidden;
      box-shadow: var(--shadow-glow);
    }

    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
    }

    .compare-col {
      padding: 40px;
    }

    .compare-col.traditional {
      background: rgba(255, 255, 255, 0.02);
      border-right: 1px solid rgba(255, 255, 255, 0.08);
    }

    .compare-col.intelligent {
      background: rgba(16, 185, 129, 0.04);
    }

    .compare-header {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 24px;
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .compare-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 22px;
    }

    .compare-item h4 {
      font-size: 15px;
      margin-bottom: 6px;
      color: var(--text-light);
    }

    .compare-col.intelligent .compare-item h4 {
      color: var(--brand-green);
    }

    .compare-item p {
      font-size: 14px;
      line-height: 1.65;
    }

    .compare-col.traditional p {
      color: #94A3B8;
    }

    .compare-col.intelligent p {
      color: #E2E8F0;
    }

    /* Section 6: 用户实战故事区 (Stories 里程碑) */
    .section-stories {
      padding: 90px 0;
      background: #FFFFFF;
    }

    .timeline-wrapper {
      position: relative;
      margin-top: 40px;
    }

    .timeline-wrapper::before {
      content: '';
      position: absolute;
      top: 24px;
      left: 0;
      right: 0;
      height: 3px;
      background: #E2E8F0;
      z-index: 1;
    }

    .timeline-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
      z-index: 2;
    }

    .timeline-step {
      text-align: left;
    }

    .step-marker {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #FFFFFF;
      border: 3px solid var(--brand-green);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--brand-green);
      margin-bottom: 20px;
      box-shadow: 0 0 0 6px #FFFFFF;
    }

    .timeline-step:hover .step-marker {
      background: var(--brand-green);
      color: #FFFFFF;
    }

    .step-phase {
      font-size: 12px;
      font-weight: 700;
      color: var(--brand-cyan);
      text-transform: uppercase;
      letter-spacing: 0.5px;
      margin-bottom: 6px;
    }

    .step-title {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .step-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Section 7: 关键数据统计条 (Stats) */
    .section-stats {
      padding: 60px 0;
      background: linear-gradient(135deg, #0B132B 0%, #111D42 100%);
      border-top: 1px solid rgba(16, 185, 129, 0.2);
      border-bottom: 1px solid rgba(16, 185, 129, 0.2);
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }

    .stat-item {
      padding: 10px 16px;
    }

    .stat-number {
      font-size: 42px;
      font-weight: 800;
      color: #FFFFFF;
      line-height: 1.1;
      margin-bottom: 8px;
      background: linear-gradient(135deg, #10B981, #38BDF8);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      font-family: monospace;
    }

    .stat-label {
      font-size: 14px;
      color: #94A3B8;
      margin-bottom: 6px;
    }

    .stat-tag {
      display: inline-block;
      font-size: 11px;
      color: var(--brand-accent);
      background: rgba(245, 158, 11, 0.12);
      padding: 2px 8px;
      border-radius: var(--radius-full);
      font-weight: 500;
    }

    /* Section 8: 用户评价与背书区 (Testimonials) */
    .section-testimonials {
      padding: 90px 0;
      background: var(--bg-alt);
    }

    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .testimonial-card {
      background: #FFFFFF;
      padding: 32px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-rating {
      color: var(--brand-accent);
      font-size: 14px;
      margin-bottom: 16px;
      letter-spacing: 2px;
    }

    .testimonial-quote {
      font-size: 14px;
      line-height: 1.75;
      color: #334155;
      margin-bottom: 24px;
      font-style: italic;
    }

    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 14px;
      padding-top: 18px;
      border-top: 1px solid var(--border-light);
    }

    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, #10B981, #06B6D4);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #070B18;
      font-weight: 700;
      font-size: 14px;
    }

    .author-info h4 {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
    }

    .author-info p {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* Section 9: 行业动态与前沿资讯 (News) */
    .section-news {
      padding: 90px 0;
      background: #FFFFFF;
    }

    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .news-card {
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }

    .news-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--brand-green);
    }

    .news-image {
      height: 190px;
      overflow: hidden;
    }

    .news-image img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .news-card:hover .news-image img {
      transform: scale(1.06);
    }

    .news-content {
      padding: 24px;
      display: flex;
      flex-direction: column;
      flex-grow: 1;
    }

    .news-meta {
      font-size: 12px;
      color: var(--brand-cyan);
      margin-bottom: 8px;
      font-weight: 600;
    }

    .news-title {
      font-size: 17px;
      font-weight: 700;
      line-height: 1.4;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .news-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 20px;
      flex-grow: 1;
    }

    .news-link {
      font-size: 13px;
      font-weight: 600;
      color: var(--brand-green);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    /* Section 10: 平台保障与合规认证 (Security) */
    .section-security {
      padding: 90px 0;
      background: var(--bg-alt);
    }

    .security-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .security-card {
      background: #FFFFFF;
      padding: 28px 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      text-align: center;
      transition: var(--transition);
    }

    .security-card:hover {
      border-color: var(--brand-green);
      transform: translateY(-4px);
    }

    .security-icon {
      width: 52px;
      height: 52px;
      margin: 0 auto 18px;
      border-radius: 50%;
      background: rgba(6, 182, 212, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--brand-cyan);
      font-size: 22px;
    }

    .security-card h3 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .security-card p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Section 11: 快速解答 FAQ */
    .section-faq {
      padding: 90px 0;
      background: #FFFFFF;
    }

    .faq-list {
      max-width: 820px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      background: var(--bg-alt);
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-item[open] {
      background: #FFFFFF;
      border-color: var(--brand-green);
      box-shadow: var(--shadow-sm);
    }

    .faq-item summary {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-item summary::-webkit-details-marker {
      display: none;
    }

    .faq-item summary::after {
      content: '+';
      font-size: 20px;
      color: var(--brand-green);
      transition: transform 0.2s ease;
    }

    .faq-item[open] summary::after {
      content: '−';
    }

    .faq-body {
      padding: 0 24px 22px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* Section 12: 底部转化表单 (Contact) */
    .section-contact {
      padding: 90px 0;
      background: #0B132B;
      color: var(--text-white);
      position: relative;
    }

    .contact-card {
      max-width: 840px;
      margin: 0 auto;
      background: #0F172A;
      border: 1px solid rgba(16, 185, 129, 0.3);
      border-radius: var(--radius-lg);
      padding: 48px;
      box-shadow: var(--shadow-glow);
    }

    .contact-form {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-top: 32px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .form-group.full {
      grid-column: span 2;
    }

    .form-group label {
      font-size: 13px;
      font-weight: 600;
      color: #CBD5E1;
    }

    .form-control {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius-sm);
      padding: 12px 16px;
      color: #FFFFFF;
      outline: none;
      transition: var(--transition);
    }

    .form-control:focus {
      border-color: var(--brand-green);
      background: rgba(255, 255, 255, 0.08);
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
    }

    .form-control::placeholder {
      color: #64748B;
    }

    .form-submit-btn {
      grid-column: span 2;
      background: linear-gradient(135deg, var(--brand-green) 0%, var(--brand-cyan) 100%);
      color: #070B18;
      border: none;
      padding: 15px;
      font-size: 16px;
      font-weight: 700;
      border-radius: var(--radius-md);
      cursor: pointer;
      transition: var(--transition);
      margin-top: 10px;
    }

    .form-submit-btn:hover {
      box-shadow: 0 8px 25px rgba(16, 185, 129, 0.45);
      transform: translateY(-2px);
    }

    /* 统一页脚 */
    .site-footer {
      background: #070B18;
      color: #94A3B8;
      font-size: 13px;
      padding: 70px 0 30px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 50px;
    }

    .footer-brand h3 {
      font-size: 18px;
      color: var(--text-white);
      margin-bottom: 14px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .footer-brand p {
      line-height: 1.7;
      margin-bottom: 20px;
      color: #64748B;
      font-size: 13px;
    }

    .footer-col h4 {
      font-size: 15px;
      color: var(--text-white);
      margin-bottom: 16px;
      font-weight: 600;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links a:hover {
      color: var(--brand-green);
    }

    .footer-bottom {
      padding-top: 30px;
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      color: #475569;
    }

    /* 移动端与响应式断点 */
    @media (max-width: 1024px) {
      .advantages-grid, .products-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .security-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .timeline-steps {
        grid-template-columns: repeat(2, 1fr);
        gap: 36px;
      }
      .timeline-wrapper::before {
        display: none;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .top-bar {
        display: none;
      }
      .mobile-toggle {
        display: block;
      }
      .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: #0B132B;
        flex-direction: column;
        padding: 30px;
        gap: 20px;
        border-bottom: 1px solid rgba(16, 185, 129, 0.2);
        display: none;
      }
      .nav-menu.show {
        display: flex;
      }
      .nav-cta {
        display: none;
      }
      .hero-title {
        font-size: 32px;
      }
      .about-grid, .compare-grid {
        grid-template-columns: 1fr;
      }
      .about-image-card img {
        height: 280px;
      }
      .advantages-grid, .products-grid, .news-grid, .testimonials-grid {
        grid-template-columns: 1fr;
      }
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-card {
        padding: 24px;
      }
      .contact-form {
        grid-template-columns: 1fr;
      }
      .form-group.full {
        grid-column: span 1;
      }
      .form-submit-btn {
        grid-column: span 1;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }