/* roulang page: index */
:root {
      --bg-main: #0F111A;
      --bg-card: #181B26;
      --bg-card-hover: #1F2433;
      --color-primary: #6366F1;
      --color-primary-dark: #4F46E5;
      --color-accent: #8B5CF6;
      --color-success: #10B981;
      --color-warning: #F59E0B;
      --text-main: #F9FAFB;
      --text-muted: #9CA3AF;
      --border-light: rgba(255, 255, 255, 0.08);
      --border-focus: rgba(99, 102, 241, 0.4);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --shadow-card: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
      --shadow-glow: 0 12px 30px -8px rgba(99, 102, 241, 0.35);
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      --max-width: 1240px;
    }

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

    html {
      scroll-behavior: smooth;
      background-color: var(--bg-main);
      color: var(--text-main);
      font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      min-width: 320px;
    }

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

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

    ul, ol {
      list-style: none;
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(15, 17, 26, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
    }

    .utility-bar {
      background: rgba(8, 10, 15, 0.85);
      font-size: 12px;
      color: var(--text-muted);
      border-bottom: 1px solid rgba(255, 255, 255, 0.04);
      padding: 6px 0;
    }

    .utility-flex {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .utility-tags {
      display: flex;
      gap: 16px;
    }

    .utility-tags span {
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    .utility-tags span::before {
      content: "";
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--color-success);
    }

    .main-nav {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 16px 0;
    }

    .nav-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 20px;
      font-weight: 700;
      letter-spacing: 0.5px;
      color: var(--text-main);
    }

    .nav-logo-badge {
      background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
      padding: 4px 8px;
      border-radius: var(--radius-sm);
      font-size: 11px;
      font-weight: 600;
      color: #fff;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }

    .nav-links a {
      font-size: 15px;
      color: var(--text-muted);
      font-weight: 500;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: #fff;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 14px;
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      gap: 8px;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
      color: #fff;
      box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
    }

    .btn-primary:hover {
      box-shadow: var(--shadow-glow);
      transform: translateY(-2px);
    }

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

    .btn-outline:hover {
      background: rgba(255, 255, 255, 0.05);
      border-color: rgba(255, 255, 255, 0.2);
    }

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

    /* 板块通用 */
    section {
      padding: 90px 0;
      position: relative;
    }

    .section-darker {
      background-color: #0B0D14;
    }

    .section-tint {
      background: linear-gradient(180deg, #0F111A 0%, #151824 100%);
    }

    .section-header {
      margin-bottom: 48px;
      text-align: center;
    }

    .section-tag {
      display: inline-block;
      font-size: 12px;
      font-weight: 600;
      color: var(--color-primary);
      text-transform: uppercase;
      letter-spacing: 1.5px;
      margin-bottom: 12px;
      background: rgba(99, 102, 241, 0.1);
      padding: 4px 12px;
      border-radius: 20px;
      border: 1px solid rgba(99, 102, 241, 0.2);
    }

    .section-title {
      font-size: 32px;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 16px;
      color: var(--text-main);
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      max-width: 760px;
      margin: 0 auto;
      line-height: 1.7;
    }

    /* 1. Hero 旗舰首屏 */
    .hero-section {
      padding: 100px 0 80px;
      background: radial-gradient(circle at 80% 20%, rgba(99, 102, 241, 0.15) 0%, transparent 60%),
                  radial-gradient(circle at 20% 80%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
                  url('/assets/images/9b50daf8c09a8813.webp') center/cover no-repeat;
      position: relative;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(15, 17, 26, 0.88) 0%, rgba(15, 17, 26, 0.98) 100%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
    }

    .hero-main-box {
      max-width: 880px;
      margin: 0 auto 50px;
      text-align: center;
    }

    .hero-h1 {
      font-size: 42px;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }

    .hero-h1 span {
      background: linear-gradient(135deg, #fff 30%, #A5B4FC 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-summary {
      font-size: 16px;
      color: #D1D5DB;
      line-height: 1.8;
      margin-bottom: 36px;
    }

    .hero-cta-group {
      display: flex;
      justify-content: center;
      gap: 18px;
      margin-bottom: 40px;
    }

    .hero-strip-nav {
      background: rgba(24, 27, 38, 0.85);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 20px;
      backdrop-filter: blur(10px);
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
    }

    .hero-strip-item {
      display: flex;
      align-items: center;
      gap: 14px;
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      background: rgba(255, 255, 255, 0.02);
      transition: var(--transition);
      border: 1px solid transparent;
    }

    .hero-strip-item:hover {
      background: rgba(99, 102, 241, 0.08);
      border-color: rgba(99, 102, 241, 0.3);
      transform: translateY(-2px);
    }

    .hero-strip-num {
      font-size: 18px;
      font-weight: 700;
      color: var(--color-primary);
      font-variant-numeric: tabular-nums;
    }

    .hero-strip-text h4 {
      font-size: 14px;
      color: #fff;
      margin-bottom: 2px;
    }

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

    /* 2. 指标看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .metric-card {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      text-align: center;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      position: relative;
      overflow: hidden;
    }

    .metric-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 3px;
      background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
      opacity: 0;
      transition: var(--transition);
    }

    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-glow);
      border-color: var(--border-focus);
    }

    .metric-card:hover::before {
      opacity: 1;
    }

    .metric-val {
      font-size: 40px;
      font-weight: 800;
      color: #fff;
      font-variant-numeric: tabular-nums;
      margin-bottom: 8px;
      letter-spacing: -1px;
    }

    .metric-val span {
      font-size: 24px;
      color: var(--color-success);
    }

    .metric-name {
      font-size: 15px;
      color: var(--text-muted);
      margin-bottom: 6px;
    }

    .metric-sub {
      font-size: 12px;
      color: rgba(255, 255, 255, 0.4);
    }

    /* 3. 平台底座图文 */
    .overview-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 50px;
      align-items: center;
    }

    .overview-info h3 {
      font-size: 26px;
      margin-bottom: 20px;
      line-height: 1.4;
    }

    .overview-p {
      color: var(--text-muted);
      margin-bottom: 24px;
      font-size: 15px;
      line-height: 1.8;
    }

    .tech-badges {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 24px;
    }

    .tech-pill {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      padding: 8px 14px;
      font-size: 13px;
      color: #E5E7EB;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .tech-pill-dot {
      width: 6px;
      height: 6px;
      background: var(--color-primary);
      border-radius: 50%;
    }

    .overview-visual {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 16px;
      box-shadow: var(--shadow-card);
    }

    .overview-visual img {
      border-radius: var(--radius-md);
      width: 100%;
      height: 380px;
      object-fit: cover;
    }

    /* 4. 竞争优势 */
    .adv-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .adv-card {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 30px;
      transition: var(--transition);
    }

    .adv-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-glow);
      border-color: rgba(99, 102, 241, 0.3);
    }

    .adv-icon {
      width: 48px;
      height: 48px;
      background: rgba(99, 102, 241, 0.12);
      border: 1px solid rgba(99, 102, 241, 0.25);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      font-size: 20px;
      color: var(--color-primary);
    }

    .adv-card h3 {
      font-size: 18px;
      margin-bottom: 12px;
      color: #fff;
    }

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

    /* 5. 广告矩阵 Bento Grid */
    .bento-grid {
      display: grid;
      grid-template-columns: repeat(12, 1fr);
      grid-auto-rows: minmax(180px, auto);
      gap: 24px;
    }

    .bento-card {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 32px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .bento-card:hover {
      border-color: var(--border-focus);
      transform: translateY(-3px);
    }

    .bento-card-7 {
      grid-column: span 7;
    }

    .bento-card-5 {
      grid-column: span 5;
    }

    .bento-card-6 {
      grid-column: span 6;
    }

    .bento-head {
      margin-bottom: 16px;
    }

    .bento-head h3 {
      font-size: 20px;
      margin-bottom: 8px;
    }

    .bento-head p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .bento-meta {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-top: 24px;
      padding-top: 16px;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
    }

    .bento-badge {
      font-size: 12px;
      background: rgba(255, 255, 255, 0.05);
      padding: 4px 10px;
      border-radius: 4px;
      color: #D1D5DB;
    }

    .bento-rate {
      font-size: 14px;
      font-weight: 700;
      color: var(--color-success);
    }

    /* 6. 变现产品 */
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .product-box {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 36px 28px;
      display: flex;
      flex-direction: column;
      position: relative;
      transition: var(--transition);
    }

    .product-box.featured {
      border-color: var(--color-primary);
      background: linear-gradient(180deg, rgba(99, 102, 241, 0.08) 0%, rgba(24, 27, 38, 1) 100%);
    }

    .product-box:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-card);
    }

    .product-featured-badge {
      position: absolute;
      top: -12px;
      right: 24px;
      background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
      color: #fff;
      font-size: 11px;
      font-weight: 700;
      padding: 3px 12px;
      border-radius: 20px;
      text-transform: uppercase;
    }

    .product-header h3 {
      font-size: 20px;
      margin-bottom: 12px;
    }

    .product-header p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 24px;
    }

    .product-specs {
      margin: 20px 0;
      padding: 16px 0;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }

    .spec-item {
      display: flex;
      justify-content: space-between;
      font-size: 13px;
      margin-bottom: 8px;
    }

    .spec-item span:first-child {
      color: var(--text-muted);
    }

    .spec-item span:last-child {
      font-weight: 600;
      color: #fff;
    }

    .product-features {
      margin-bottom: 30px;
      flex-grow: 1;
    }

    .product-features li {
      font-size: 13px;
      color: #D1D5DB;
      margin-bottom: 10px;
      position: relative;
      padding-left: 18px;
    }

    .product-features li::before {
      content: "✓";
      position: absolute;
      left: 0;
      color: var(--color-primary);
      font-weight: bold;
    }

    /* 7. 归因结果对比 */
    .compare-container {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 40px;
      overflow-x: auto;
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }

    .compare-table th, 
    .compare-table td {
      padding: 18px 20px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }

    .compare-table th {
      font-size: 15px;
      color: var(--text-muted);
      font-weight: 600;
      background: rgba(255, 255, 255, 0.02);
    }

    .compare-table th.highlight-col {
      color: var(--color-primary);
      font-size: 16px;
      background: rgba(99, 102, 241, 0.06);
      border-top: 2px solid var(--color-primary);
    }

    .compare-table td {
      font-size: 14px;
    }

    .compare-table td.highlight-col {
      background: rgba(99, 102, 241, 0.03);
      font-weight: 600;
      color: #fff;
    }

    .compare-tag-good {
      display: inline-block;
      padding: 2px 8px;
      background: rgba(16, 185, 129, 0.15);
      color: var(--color-success);
      border-radius: 4px;
      font-size: 12px;
    }

    /* 8. 里程碑时间线 */
    .timeline-wrap {
      position: relative;
      max-width: 960px;
      margin: 0 auto;
    }

    .timeline-wrap::before {
      content: "";
      position: absolute;
      top: 0;
      bottom: 0;
      left: 50%;
      width: 2px;
      background: rgba(255, 255, 255, 0.1);
      transform: translateX(-50%);
    }

    .timeline-row {
      display: flex;
      justify-content: flex-end;
      padding-bottom: 40px;
      position: relative;
      width: 50%;
    }

    .timeline-row.right {
      margin-left: 50%;
      justify-content: flex-start;
    }

    .timeline-dot {
      position: absolute;
      top: 10px;
      right: -8px;
      width: 14px;
      height: 14px;
      border-radius: 50%;
      background: var(--color-primary);
      border: 3px solid var(--bg-main);
      z-index: 2;
    }

    .timeline-row.right .timeline-dot {
      left: -8px;
      right: auto;
    }

    .timeline-content {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 24px;
      width: 90%;
      box-shadow: var(--shadow-card);
    }

    .timeline-year {
      font-size: 13px;
      font-weight: 700;
      color: var(--color-primary);
      margin-bottom: 6px;
    }

    .timeline-content h4 {
      font-size: 16px;
      margin-bottom: 8px;
    }

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

    /* 9. 真实开发者故事 */
    .stories-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }

    .story-card {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 32px;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .story-header {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
    }

    .story-title h3 {
      font-size: 18px;
      margin-bottom: 4px;
    }

    .story-title span {
      font-size: 13px;
      color: var(--text-muted);
    }

    .story-stat-badge {
      background: rgba(16, 185, 129, 0.1);
      border: 1px solid rgba(16, 185, 129, 0.3);
      padding: 6px 12px;
      border-radius: var(--radius-sm);
      text-align: right;
    }

    .story-stat-badge strong {      display: block;
      color: var(--color-success);
      font-size: 16px;
      font-weight: 700;
    }

    .story-stat-badge small {
      font-size: 11px;
      color: var(--text-muted);
    }

    .story-card p {
      font-size: 14px;
      color: #D1D5DB;
      line-height: 1.7;
    }

    .story-author {
      display: flex;
      align-items: center;
      gap: 12px;
      padding-top: 16px;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
    }

    .story-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #252A3C;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--color-primary);
    }

    .story-meta h5 {
      font-size: 14px;
      color: #fff;
    }

    .story-meta span {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 10. 合作伙伴评价 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .review-card {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-rating {
      color: var(--color-warning);
      font-size: 14px;
      margin-bottom: 14px;
      letter-spacing: 2px;
    }

    .review-card blockquote {
      font-size: 14px;
      color: #E5E7EB;
      line-height: 1.7;
      margin-bottom: 20px;
    }

    .review-user h4 {
      font-size: 14px;
      color: #fff;
    }

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

    /* 11. 行业资讯摘要 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .news-card {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }

    .news-card:hover {
      transform: translateY(-4px);
      border-color: var(--border-focus);
    }

    .news-thumb {
      height: 180px;
      width: 100%;
      overflow: hidden;
    }

    .news-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }

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

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

    .news-tag {
      font-size: 11px;
      font-weight: 600;
      color: var(--color-primary);
      text-transform: uppercase;
      margin-bottom: 8px;
    }

    .news-body h3 {
      font-size: 17px;
      line-height: 1.4;
      margin-bottom: 12px;
      color: #fff;
    }

    .news-body p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .news-date {
      font-size: 12px;
      color: rgba(255, 255, 255, 0.4);
    }

    /* 12. 平台保障 */
    .guarantee-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .guarantee-box {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 28px 20px;
      text-align: center;
    }

    .guarantee-icon {
      font-size: 26px;
      color: var(--color-primary);
      margin-bottom: 14px;
    }

    .guarantee-box h3 {
      font-size: 16px;
      margin-bottom: 8px;
      color: #fff;
    }

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

    /* 13. FAQ 手风琴 */
    .faq-container {
      max-width: 840px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      margin-bottom: 14px;
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-item.active {
      border-color: var(--border-focus);
    }

    .faq-toggle {
      width: 100%;
      padding: 20px 24px;
      text-align: left;
      background: none;
      border: none;
      color: #fff;
      font-size: 16px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: var(--transition);
    }

    .faq-icon {
      font-size: 18px;
      transition: transform 0.25s ease;
      color: var(--color-primary);
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    .faq-panel {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: rgba(0, 0, 0, 0.15);
    }

    .faq-panel-inner {
      padding: 0 24px 20px;
      font-size: 14px;
      color: #D1D5DB;
      line-height: 1.7;
    }

    /* 转化表单 */
    .contact-wrapper {
      background: linear-gradient(135deg, rgba(99, 102, 241, 0.12) 0%, rgba(139, 92, 246, 0.05) 100%);
      border: 1px solid rgba(99, 102, 241, 0.25);
      border-radius: var(--radius-lg);
      padding: 50px 40px;
      max-width: 860px;
      margin: 0 auto;
      box-shadow: var(--shadow-card);
    }

    .contact-form {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-top: 32px;
    }

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

    .form-label {
      display: block;
      font-size: 13px;
      font-weight: 500;
      margin-bottom: 8px;
      color: #E5E7EB;
    }

    .form-control {
      width: 100%;
      background: rgba(15, 17, 26, 0.85);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      padding: 12px 16px;
      color: #fff;
      font-size: 14px;
      outline: none;
      transition: var(--transition);
    }

    .form-control:focus {
      border-color: var(--color-primary);
      box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
    }

    select.form-control {
      appearance: none;
      background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%239CA3AF' viewBox='0 0 16 16'%3E%3Cpath d='M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E");
      background-repeat: no-repeat;
      background-position: calc(100% - 16px) center;
    }

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

    .form-checkbox input {
      accent-color: var(--color-primary);
    }

    /* 页脚 */
    .site-footer {
      background: #080A0F;
      border-top: 1px solid var(--border-light);
      padding: 60px 0 30px;
      color: var(--text-muted);
      font-size: 14px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-brand h4 {
      font-size: 18px;
      color: #fff;
      margin-bottom: 12px;
      font-weight: 700;
    }

    .footer-brand p {
      font-size: 13px;
      line-height: 1.7;
      color: var(--text-muted);
      margin-bottom: 16px;
      max-width: 320px;
    }

    .footer-col h5 {
      color: #fff;
      font-size: 14px;
      margin-bottom: 16px;
      font-weight: 600;
    }

    .footer-col ul li {
      margin-bottom: 10px;
    }

    .footer-col ul li a {
      color: var(--text-muted);
      font-size: 13px;
    }

    .footer-col ul li a:hover {
      color: #fff;
    }

    .footer-contact-info p {
      font-size: 13px;
      margin-bottom: 8px;
      color: var(--text-muted);
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 12px;
    }

    .footer-copy {
      color: rgba(255, 255, 255, 0.4);
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-strip-nav {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-grid,
      .adv-grid,
      .products-grid,
      .reviews-grid,
      .news-grid,
      .guarantee-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .bento-card-7, .bento-card-5, .bento-card-6 {
        grid-column: span 12;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .overview-grid {
        grid-template-columns: 1fr;
      }
      .overview-visual img {
        height: 280px;
      }
    }

    @media (max-width: 768px) {
      .mobile-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-card);
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-light);
        gap: 16px;
      }
      .nav-links.show {
        display: flex;
      }
      .utility-flex {
        flex-direction: column;
        gap: 4px;
        text-align: center;
      }
      .utility-tags {
        display: none;
      }
      .hero-h1 {
        font-size: 28px;
      }
      .hero-strip-nav {
        grid-template-columns: 1fr;
      }
      .metrics-grid,
      .adv-grid,
      .products-grid,
      .stories-grid,
      .reviews-grid,
      .news-grid,
      .guarantee-grid {
        grid-template-columns: 1fr;
      }
      .timeline-wrap::before {
        left: 10px;
      }
      .timeline-row,
      .timeline-row.right {
        width: 100%;
        margin-left: 0;
        padding-left: 32px;
        justify-content: flex-start;
      }
      .timeline-dot,
      .timeline-row.right .timeline-dot {
        left: 3px;
        right: auto;
      }
      .timeline-content {
        width: 100%;
      }
      .contact-form {
        grid-template-columns: 1fr;
      }
      .form-group-full {
        grid-column: span 1;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
      .btn {
        width: 100%;
      }
      .hero-cta-group {
        flex-direction: column;
      }
    }