/* roulang page: index */
:root {
      --primary: #0E4D6C;
      --primary-hover: #09374F;
      --accent: #14B8A6;
      --accent-hover: #0D9488;
      --dark-surface: #0B1B26;
      --dark-card: #132735;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --shadow-sm: 0 2px 4px rgba(14, 77, 108, 0.04);
      --shadow-md: 0 10px 30px -10px rgba(14, 77, 108, 0.08);
      --shadow-lg: 0 20px 40px -15px rgba(14, 77, 108, 0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }

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

    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-light);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

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

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

    /* 顶部通栏信息 */
    .top-bar {
      background-color: #082837;
      color: #94A3B8;
      font-size: 13px;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
    }
    .top-bar-item {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    /* 导航栏 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      transition: all 0.3s ease;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 22px;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .brand-badge {
      font-size: 11px;
      font-weight: 600;
      background: rgba(20, 184, 166, 0.12);
      color: var(--accent);
      padding: 2px 8px;
      border-radius: 4px;
      border: 1px solid rgba(20, 184, 166, 0.25);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 28px;
    }
    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      transition: color 0.2s ease;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--primary);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 14px;
    }

    /* 通用按钮 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 11px 24px;
      border-radius: var(--radius-sm);
      font-size: 15px;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      border: 1px solid transparent;
      line-height: 1.4;
      text-align: center;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(14, 77, 108, 0.25);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-1px);
    }
    .btn-accent {
      background-color: var(--accent);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(20, 184, 166, 0.3);
    }
    .btn-accent:hover {
      background-color: var(--accent-hover);
      transform: translateY(-1px);
    }
    .btn-outline {
      border-color: var(--border-color);
      color: var(--text-main);
      background-color: #FFFFFF;
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: rgba(14, 77, 108, 0.04);
    }
    .btn-outline-white {
      border-color: rgba(255, 255, 255, 0.3);
      color: #FFFFFF;
      background: transparent;
    }
    .btn-outline-white:hover {
      background: rgba(255, 255, 255, 0.1);
      border-color: #FFFFFF;
    }

    /* 通用 Section 规范 */
    .section-wrap {
      padding: 86px 0;
      position: relative;
    }
    .section-wrap.white { background-color: var(--bg-white); }
    .section-wrap.light { background-color: var(--bg-light); }
    .section-wrap.dark {
      background-color: var(--dark-surface);
      color: #F8FAFC;
    }

    .section-header {
      margin-bottom: 50px;
      max-width: 820px;
    }
    .section-header.center {
      text-align: center;
      margin-left: auto;
      margin-right: auto;
    }
    .section-subtitle {
      font-size: 13px;
      font-weight: 700;
      letter-spacing: 1.5px;
      color: var(--accent);
      text-transform: uppercase;
      margin-bottom: 10px;
      display: inline-block;
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 16px;
      color: inherit;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .dark .section-desc {
      color: #94A3B8;
    }

    /* 1. Hero 区域：路线图预告与版本节点 */
    .hero-banner {
      position: relative;
      background: linear-gradient(135deg, rgba(11, 27, 38, 0.92) 0%, rgba(14, 77, 108, 0.88) 100%),
                  url('/assets/images/93c933267e11d442.webp') center/cover no-repeat;
      color: #FFFFFF;
      padding: 96px 0 80px 0;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.25fr 0.95fr;
      gap: 50px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 44px;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 22px;
      letter-spacing: -0.5px;
    }
    .hero-content p {
      font-size: 16px;
      line-height: 1.8;
      color: #E2E8F0;
      margin-bottom: 32px;
      max-width: 620px;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 40px;
    }

    /* 路线图预告节点条 */
    .roadmap-node-bar {
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius-md);
      padding: 20px 24px;
      backdrop-filter: blur(8px);
    }
    .roadmap-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 14px;
      font-size: 13px;
      color: #94A3B8;
    }
    .roadmap-track {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 14px;
    }
    .node-item {
      position: relative;
      padding-left: 14px;
      border-left: 2px solid rgba(255, 255, 255, 0.2);
    }
    .node-item.active {
      border-left-color: var(--accent);
    }
    .node-ver {
      font-size: 12px;
      font-weight: 700;
      color: var(--accent);
    }
    .node-title {
      font-size: 13px;
      font-weight: 600;
      color: #FFFFFF;
      margin-top: 2px;
    }
    .node-desc {
      font-size: 11px;
      color: #CBD5E1;
      margin-top: 2px;
    }

    .hero-panel {
      background: rgba(19, 39, 53, 0.85);
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-lg);
      backdrop-filter: blur(10px);
    }
    .hero-panel-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 8px;
      color: #FFFFFF;
    }
    .hero-panel-desc {
      font-size: 13px;
      color: #94A3B8;
      margin-bottom: 20px;
    }
    .quick-sub-form {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .form-input {
      width: 100%;
      padding: 13px 16px;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255, 255, 255, 0.2);
      background: rgba(255, 255, 255, 0.05);
      color: #FFFFFF;
      font-size: 14px;
      outline: none;
      transition: border-color 0.2s;
    }
    .form-input:focus {
      border-color: var(--accent);
      background: rgba(255, 255, 255, 0.08);
    }
    .form-input::placeholder {
      color: #64748B;
    }

    /* 2. 品牌故事与工具产品矩阵介绍区 */
    .brand-story-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
    }
    .brand-story-media {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
    }
    .brand-badge-overlay {
      position: absolute;
      bottom: 20px;
      left: 20px;
      background: rgba(14, 77, 108, 0.9);
      color: #FFFFFF;
      padding: 12px 20px;
      border-radius: var(--radius-sm);
      backdrop-filter: blur(6px);
      font-size: 13px;
      line-height: 1.4;
    }
    .spec-badge-group {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 24px;
    }
    .spec-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 8px 14px;
      background: #F1F5F9;
      border-radius: var(--radius-sm);
      font-size: 13px;
      color: var(--primary);
      font-weight: 600;
      border: 1px solid #E2E8F0;
    }

    /* 3. 系列导航 / 核心功能 6 卡片网格 */
    .feature-grid-6 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      position: relative;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      border-color: var(--accent);
      box-shadow: var(--shadow-md);
    }
    .card-icon-wrap {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: rgba(20, 184, 166, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      margin-bottom: 20px;
      font-size: 20px;
      font-weight: bold;
    }
    .feature-card h3 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--primary);
    }
    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 4. 爆款选配网格 (3卡片) */
    .hot-products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .product-plan-card {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      transition: all 0.3s ease;
      box-shadow: var(--shadow-sm);
    }
    .product-plan-card:hover {
      box-shadow: var(--shadow-lg);
      transform: translateY(-5px);
    }
    .product-plan-card.featured {
      border: 2px solid var(--accent);
      position: relative;
    }
    .plan-tag {
      position: absolute;
      top: 14px;
      right: 14px;
      background: var(--accent);
      color: #FFF;
      font-size: 11px;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 20px;
      z-index: 2;
    }
    .plan-cover {
      height: 200px;
      overflow: hidden;
      position: relative;
    }
    .plan-cover img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }
    .product-plan-card:hover .plan-cover img {
      transform: scale(1.05);
    }
    .plan-body {
      padding: 28px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .plan-title {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 10px;
    }
    .plan-desc {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 20px;
      line-height: 1.6;
    }
    .plan-features-list {
      list-style: none;
      margin-bottom: 28px;
      flex-grow: 1;
    }
    .plan-features-list li {
      font-size: 13px;
      color: var(--text-main);
      padding: 8px 0;
      border-bottom: 1px dashed #F1F5F9;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .plan-features-list li::before {
      content: "✓";
      color: var(--accent);
      font-weight: 800;
    }

    /* 5. 深色理念区与数字化底座 */
    .dark-philosophy-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
    }
    .philosophy-text h2 {
      font-size: 34px;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 20px;
      color: #FFFFFF;
    }
    .philosophy-text p {
      font-size: 15px;
      color: #94A3B8;
      line-height: 1.8;
      margin-bottom: 24px;
    }
    .badge-quad-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }
    .quad-badge {
      background: var(--dark-card);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-md);
      padding: 24px;
    }
    .quad-badge-num {
      font-size: 24px;
      font-weight: 800;
      color: var(--accent);
      margin-bottom: 8px;
    }
    .quad-badge-name {
      font-size: 15px;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 6px;
    }
    .quad-badge-info {
      font-size: 12px;
      color: #94A3B8;
      line-height: 1.5;
    }

    /* 6. 会员权益与终端应用场景 */
    .scene-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .scene-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 28px;
      box-shadow: var(--shadow-sm);
    }
    .scene-role {
      font-size: 12px;
      font-weight: 700;
      color: var(--accent);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
    }
    .scene-card h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 12px;
    }
    .scene-diff {
      background: #F8FAFC;
      border-left: 3px solid var(--accent);
      padding: 12px 14px;
      font-size: 13px;
      color: var(--text-main);
      margin-top: 16px;
      line-height: 1.6;
    }

    /* 7. 效能数据条 */
    .metrics-bar-wrap {
      background: linear-gradient(90deg, #09374F 0%, #0E4D6C 100%);
      color: #FFFFFF;
      padding: 48px 0;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .metric-item {
      padding: 0 16px;
      border-right: 1px solid rgba(255, 255, 255, 0.15);
    }
    .metric-item:last-child {
      border-right: none;
    }
    .metric-number {
      font-size: 40px;
      font-weight: 900;
      color: #5EEAD4;
      line-height: 1;
      margin-bottom: 8px;
      font-feature-settings: "tnum";
    }
    .metric-title {
      font-size: 14px;
      font-weight: 600;
      color: #F1F5F9;
      margin-bottom: 4px;
    }
    .metric-sub {
      font-size: 12px;
      color: #94A3B8;
    }

    /* 8. 业界口碑墙 */
    .testimonial-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .testimonial-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      position: relative;
    }
    .testimonial-stars {
      color: #F59E0B;
      font-size: 14px;
      margin-bottom: 14px;
      letter-spacing: 2px;
    }
    .testimonial-quote {
      font-size: 14px;
      color: var(--text-main);
      line-height: 1.7;
      margin-bottom: 22px;
    }
    .testimonial-meta {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .meta-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #E2E8F0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
      font-size: 16px;
    }
    .meta-info h4 {
      font-size: 14px;
      font-weight: 700;
      color: var(--primary);
    }
    .meta-info span {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 9. 数字化内嵌资讯 */
    .news-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .news-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }
    .news-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .news-img {
      height: 170px;
      overflow: hidden;
    }
    .news-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .news-card:hover .news-img img {
      transform: scale(1.04);
    }
    .news-body {
      padding: 22px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .news-date {
      font-size: 12px;
      color: var(--accent);
      font-weight: 600;
      margin-bottom: 8px;
    }
    .news-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.45;
      margin-bottom: 10px;
    }
    .news-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 10. 对比矩阵表 */
    .compare-table-wrapper {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      overflow-x: auto;
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }
    .compare-table th, .compare-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-color);
    }
    .compare-table th {
      background: #F8FAFC;
      font-weight: 700;
      color: var(--text-main);
      font-size: 15px;
    }
    .compare-table th.highlight-col, .compare-table td.highlight-col {
      background: rgba(20, 184, 166, 0.05);
      color: var(--primary);
      font-weight: 600;
    }
    .compare-badge-good {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: #0D9488;
      font-weight: 700;
    }
    .compare-badge-bad {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: #94A3B8;
    }

    /* 11. FAQ 手风琴 */
    .faq-accordion-wrap {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: border-color 0.2s;
    }
    .faq-item:hover {
      border-color: #CBD5E1;
    }
    .faq-question {
      padding: 20px 24px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 700;
      color: var(--primary);
      font-size: 16px;
      user-select: none;
    }
    .faq-question::after {
      content: "+";
      font-size: 20px;
      font-weight: 400;
      color: var(--accent);
      transition: transform 0.25s ease;
    }
    .faq-item.open .faq-question::after {
      transform: rotate(45deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.7;
    }
    .faq-item.open .faq-answer {
      max-height: 300px;
      padding: 0 24px 20px 24px;
    }

    /* 12. 交付保障与信任条 */
    .guarantee-bar-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .guarantee-box {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      gap: 16px;
      align-items: flex-start;
    }
    .guarantee-icon {
      width: 40px;
      height: 40px;
      border-radius: 8px;
      background: rgba(14, 77, 108, 0.08);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      font-weight: 800;
      flex-shrink: 0;
    }
    .guarantee-text h4 {
      font-size: 15px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 4px;
    }
    .guarantee-text p {
      font-size: 12px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 13. 底部收尾转化区 */
    .cta-banner-card {
      background: linear-gradient(135deg, var(--dark-surface) 0%, var(--primary) 100%);
      border-radius: var(--radius-lg);
      padding: 60px 40px;
      color: #FFFFFF;
      text-align: center;
      box-shadow: var(--shadow-lg);
      position: relative;
      overflow: hidden;
    }
    .cta-banner-card h2 {
      font-size: 34px;
      font-weight: 800;
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .cta-banner-card p {
      font-size: 16px;
      color: #CBD5E1;
      max-width: 640px;
      margin: 0 auto 36px auto;
      line-height: 1.7;
    }
    .cta-form-row {
      display: flex;
      justify-content: center;
      gap: 12px;
      max-width: 580px;
      margin: 0 auto;
      flex-wrap: wrap;
    }
    .cta-form-row input {
      flex: 1;
      min-width: 200px;
      padding: 13px 18px;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255, 255, 255, 0.2);
      background: rgba(255, 255, 255, 0.1);
      color: #FFF;
      font-size: 14px;
      outline: none;
    }
    .cta-form-row input::placeholder {
      color: #94A3B8;
    }
    .cta-form-row input:focus {
      border-color: var(--accent);
      background: rgba(255, 255, 255, 0.15);
    }

    /* 全局固定转化浮条 */
    .fixed-action-bar {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(11, 27, 38, 0.94);
      backdrop-filter: blur(12px);
      border-top: 1px solid rgba(255, 255, 255, 0.12);
      padding: 12px 24px;
      z-index: 999;
      display: flex;
      justify-content: space-between;
      align-items: center;
      box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.15);
    }
    .fixed-bar-left {
      display: flex;
      align-items: center;
      gap: 16px;
      color: #FFFFFF;
    }
    .fixed-bar-title {
      font-size: 14px;
      font-weight: 700;
    }
    .fixed-bar-sub {
      font-size: 12px;
      color: #94A3B8;
    }
    .fixed-bar-right {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .back-to-top {
      background: rgba(255, 255, 255, 0.1);
      color: #FFFFFF;
      border: none;
      width: 36px;
      height: 36px;
      border-radius: 6px;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
      transition: background 0.2s;
    }
    .back-to-top:hover {
      background: rgba(255, 255, 255, 0.2);
    }

    /* 页脚 */
    .site-footer {
      background-color: var(--dark-surface);
      color: #94A3B8;
      padding: 64px 0 96px 0;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 13px;
    }
    .footer-main-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 48px;
    }
    .footer-brand h3 {
      font-size: 20px;
      font-weight: 800;
      color: #FFFFFF;
      margin-bottom: 14px;
    }
    .footer-brand p {
      line-height: 1.7;
      margin-bottom: 16px;
      color: #94A3B8;
      max-width: 360px;
    }
    .footer-col h4 {
      font-size: 15px;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 16px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a {
      color: #94A3B8;
      transition: color 0.2s;
    }
    .footer-links a:hover {
      color: var(--accent);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 12px;
      color: #64748B;
    }
    .footer-bottom-links {
      display: flex;
      gap: 18px;
    }

    /* 移动端菜单切换 */
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .mobile-menu-btn span {
      display: block;
      width: 22px;
      height: 2px;
      background-color: var(--text-main);
      margin: 4px 0;
      transition: 0.2s;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-grid, .brand-story-grid, .dark-philosophy-grid {
        grid-template-columns: 1fr;
        gap: 36px;
      }
      .feature-grid-6, .hot-products-grid, .scene-grid-3, .testimonial-grid-3, .news-grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .guarantee-bar-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-main-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .section-wrap { padding: 56px 0; }
      .hero-content h1 { font-size: 30px; }
      .section-title { font-size: 24px; }
      .top-bar { display: none; }
      .nav-menu {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        padding: 20px 24px;
        border-bottom: 1px solid var(--border-color);
        gap: 16px;
        box-shadow: var(--shadow-md);
      }
      .nav-menu.show { display: flex; }
      .mobile-menu-btn { display: block; }
      .header-actions .btn { display: none; }
      .roadmap-track { grid-template-columns: 1fr; gap: 10px; }
      .feature-grid-6, .hot-products-grid, .scene-grid-3, .testimonial-grid-3, .news-grid-3 {
        grid-template-columns: 1fr;
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
      }
      .metric-item {
        border-right: none;
      }
      .guarantee-bar-grid {
        grid-template-columns: 1fr;
      }
      .footer-main-grid {
        grid-template-columns: 1fr;
        gap: 28px;
      }
      .fixed-bar-left .fixed-bar-sub { display: none; }
      .cta-banner-card { padding: 40px 20px; }
      .cta-form-row { flex-direction: column; }
      .cta-form-row input { width: 100%; }
    }