/* roulang page: index */
:root {
      --primary: #0F4C81;
      --primary-dark: #0a3357;
      --primary-light: #1E40AF;
      --accent: #06B6D4;
      --accent-green: #10B981;
      --bg-main: #F8FAFC;
      --bg-white: #FFFFFF;
      --bg-dark: #0B192C;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --text-light: #94A3B8;
      --border-color: #E2E8F0;
      --shadow-sm: 0 2px 8px rgba(15, 76, 129, 0.04);
      --shadow-md: 0 8px 24px -4px rgba(15, 76, 129, 0.08);
      --shadow-lg: 0 16px 36px -6px rgba(15, 76, 129, 0.12);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --container-max: 1240px;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }

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

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

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

    /* 顶部信息条 */
    .top-bar {
      background-color: #082138;
      color: #CBD5E1;
      font-size: 13px;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .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: 8px;
    }
    .top-bar-link {
      color: var(--accent);
    }
    .top-bar-link:hover {
      text-decoration: underline;
    }

    /* 主导航栏 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 999;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      box-shadow: 0 2px 12px rgba(0, 0, 0, 0.05);
      border-bottom: 1px solid var(--border-color);
    }
    .nav-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 74px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .brand-logo-mark {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 800;
      font-size: 18px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 28px;
    }
    .nav-item a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      padding: 6px 0;
      position: relative;
    }
    .nav-item a:hover {
      color: var(--primary);
    }
    .nav-item a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }
    .nav-item a:hover::after {
      width: 100%;
    }
    .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: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
      border: 1px solid transparent;
      gap: 8px;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(15, 76, 129, 0.25);
    }
    .btn-primary:hover {
      background-color: var(--primary-dark);
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(15, 76, 129, 0.35);
    }
    .btn-outline {
      border-color: var(--border-color);
      color: var(--text-main);
      background-color: #fff;
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: #F8FAFC;
    }
    .btn-accent {
      background-color: var(--accent);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(6, 182, 212, 0.3);
    }
    .btn-accent:hover {
      background-color: #0891b2;
      transform: translateY(-1px);
    }

    /* 板块通用标准 */
    .section-block {
      padding: 92px 0;
      position: relative;
    }
    .section-white {
      background-color: var(--bg-white);
    }
    .section-muted {
      background-color: var(--bg-main);
    }
    .section-dark {
      background-color: var(--bg-dark);
      color: #ffffff;
    }
    .section-header {
      margin-bottom: 52px;
    }
    .section-header.text-center {
      text-align: center;
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
    }
    .badge-sub {
      display: inline-block;
      padding: 5px 14px;
      background: rgba(15, 76, 129, 0.08);
      color: var(--primary);
      font-size: 13px;
      font-weight: 600;
      border-radius: 999px;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .section-dark .badge-sub {
      background: rgba(6, 182, 212, 0.16);
      color: var(--accent);
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      line-height: 1.35;
      color: var(--text-main);
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }
    .section-dark .section-title {
      color: #ffffff;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .section-dark .section-desc {
      color: #94A3B8;
    }

    /* 1. Hero 区域：合规安全主张 + 勾选检查条 + 信任行动 */
    .hero-section {
      background: linear-gradient(180deg, #EDF4FA 0%, #F8FAFC 100%);
      padding: 70px 0 80px 0;
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid var(--border-color);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 56px;
      align-items: center;
    }
    .hero-h1 {
      font-size: 40px;
      font-weight: 800;
      line-height: 1.28;
      color: #0A2846;
      margin-bottom: 20px;
      letter-spacing: -0.8px;
    }
    .hero-intro {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 28px;
    }
    .compliance-checklist {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 14px;
      margin-bottom: 32px;
      background: #FFFFFF;
      padding: 20px;
      border-radius: var(--radius-md);
      border: 1px solid #E2E8F0;
      box-shadow: var(--shadow-sm);
    }
    .check-item {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
    }
    .check-icon {
      width: 20px;
      height: 20px;
      background-color: #ECFDF5;
      color: var(--accent-green);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 12px;
      flex-shrink: 0;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      align-items: center;
      flex-wrap: wrap;
    }
    .hero-visual-card {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-lg);
      border: 1px solid rgba(255, 255, 255, 0.8);
      background: #000;
    }
    .hero-visual-card img {
      width: 100%;
      height: 440px;
      object-fit: cover;
      opacity: 0.9;
    }
    .hero-floating-stat {
      position: absolute;
      bottom: 24px;
      left: 24px;
      right: 24px;
      background: rgba(11, 25, 44, 0.88);
      backdrop-filter: blur(12px);
      padding: 18px 22px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(255, 255, 255, 0.15);
      color: #fff;
      display: flex;
      justify-content: space-around;
      text-align: center;
    }
    .floating-stat-num {
      font-size: 24px;
      font-weight: 700;
      color: var(--accent);
    }
    .floating-stat-label {
      font-size: 12px;
      color: #94A3B8;
      margin-top: 2px;
    }

    /* 2. 内容日历区 */
    .calendar-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .calendar-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .calendar-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #CBD5E1;
    }
    .calendar-date-tag {
      display: inline-block;
      font-size: 12px;
      font-weight: 700;
      color: var(--primary);
      background: #EFF6FF;
      padding: 4px 10px;
      border-radius: 4px;
      width: fit-content;
      margin-bottom: 14px;
    }
    .calendar-title {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }
    .calendar-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .calendar-meta {
      font-size: 13px;
      color: #94A3B8;
      border-top: 1px dashed var(--border-color);
      padding-top: 12px;
      display: flex;
      justify-content: space-between;
    }

    /* 3. 热门专题区 */
    .topic-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .topic-card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }
    .topic-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .topic-card-thumb {
      height: 200px;
      width: 100%;
      overflow: hidden;
      background-color: #E2E8F0;
    }
    .topic-card-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }
    .topic-card:hover .topic-card-thumb img {
      transform: scale(1.05);
    }
    .topic-card-body {
      padding: 24px;
    }
    .topic-card-tag {
      font-size: 12px;
      color: var(--primary);
      font-weight: 600;
      margin-bottom: 8px;
    }
    .topic-card-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .topic-card-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 4. 观点解读区 */
    .insight-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .insight-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px;
      position: relative;
      border-left: 4px solid var(--primary);
    }
    .insight-quote-icon {
      font-size: 32px;
      color: #CBD5E1;
      line-height: 1;
      margin-bottom: 12px;
    }
    .insight-title {
      font-size: 19px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .insight-text {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 18px;
    }
    .insight-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #F1F5F9;
      padding-top: 16px;
    }
    .insight-author-title {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
    }
    .insight-author-sub {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 5. 场馆物联与数字化资讯列表 */
    .news-list-wrapper {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .news-item-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .news-item-date {
      font-size: 13px;
      color: #94A3B8;
      margin-bottom: 8px;
    }
    .news-item-heading {
      font-size: 17px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .news-item-p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .news-item-action {
      font-size: 14px;
      font-weight: 600;
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 6. 媒体精选与标杆案例 */
    .media-case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .media-case-item {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .media-case-img {
      height: 220px;
      width: 100%;
      overflow: hidden;
    }
    .media-case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .media-case-info {
      padding: 22px;
    }
    .media-case-badge {
      display: inline-block;
      font-size: 12px;
      background: #EEF2FF;
      color: #4F46E5;
      padding: 3px 8px;
      border-radius: 4px;
      margin-bottom: 10px;
      font-weight: 600;
    }
    .media-case-title {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 10px;
    }
    .media-case-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 7. 深色大屏可视化展示（数字孪生重音） */
    .dark-concept-block {
      background: radial-gradient(circle at 50% 30%, #152E4D 0%, #081524 100%);
      padding: 96px 0;
      color: #fff;
    }
    .dark-concept-box {
      border: 1px solid rgba(255, 255, 255, 0.12);
      border-radius: var(--radius-lg);
      background: rgba(11, 25, 44, 0.6);
      backdrop-filter: blur(16px);
      padding: 40px;
      box-shadow: 0 24px 60px rgba(0, 0, 0, 0.4);
    }
    .dark-concept-inner {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .dark-feature-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-top: 24px;
    }
    .dark-feature-item {
      display: flex;
      gap: 12px;
      font-size: 15px;
      color: #CBD5E1;
      line-height: 1.5;
    }
    .dark-feature-dot {
      width: 8px;
      height: 8px;
      background: var(--accent);
      border-radius: 50%;
      margin-top: 8px;
      flex-shrink: 0;
    }

    /* 8. 数据分析条 */
    .metrics-bar-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .metric-card {
      background: #FFFFFF;
      padding: 32px 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      text-align: center;
      box-shadow: var(--shadow-sm);
    }
    .metric-val {
      font-size: 44px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 8px;
    }
    .metric-unit {
      font-size: 20px;
      font-weight: 600;
      color: var(--accent);
    }
    .metric-title {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 6px;
    }
    .metric-desc {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 9. 智能架构交付流程 */
    .flow-steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }
    .flow-step-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px 20px;
      position: relative;
    }
    .step-badge {
      width: 36px;
      height: 36px;
      background: var(--primary);
      color: #fff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 15px;
      margin-bottom: 16px;
    }
    .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;
    }

    /* 10. 平台核心保障体系 */
    .guarantee-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .guarantee-card {
      background: #FFFFFF;
      padding: 30px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .guarantee-icon {
      width: 48px;
      height: 48px;
      background: #EFF6FF;
      color: var(--primary);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      font-weight: 800;
      margin-bottom: 18px;
    }
    .guarantee-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 10px;
    }
    .guarantee-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 11. 常见运营异议与解答（手风琴） */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 14px;
      overflow: hidden;
      transition: border-color 0.25s ease;
    }
    .faq-item:hover {
      border-color: #CBD5E1;
    }
    .faq-question {
      padding: 20px 24px;
      font-size: 17px;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-toggle-icon {
      font-size: 18px;
      transition: transform 0.3s ease;
      color: var(--primary);
    }
    .faq-answer {
      padding: 0 24px 20px 24px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-toggle-icon {
      transform: rotate(45deg);
    }

    /* 12. 订阅与专属对接通道 */
    .subscribe-box {
      background: linear-gradient(135deg, #0F4C81 0%, #064E3B 100%);
      border-radius: var(--radius-lg);
      padding: 56px 40px;
      color: #fff;
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 36px;
      align-items: center;
      box-shadow: var(--shadow-lg);
    }
    .subscribe-title {
      font-size: 28px;
      font-weight: 800;
      margin-bottom: 12px;
      color: #fff;
    }
    .subscribe-desc {
      font-size: 15px;
      color: #E2E8F0;
      line-height: 1.7;
    }
    .subscribe-form {
      display: flex;
      gap: 12px;
      background: rgba(255, 255, 255, 0.1);
      padding: 8px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(255, 255, 255, 0.2);
    }
    .subscribe-input {
      flex: 1;
      padding: 12px 16px;
      border: none;
      background: #FFFFFF;
      border-radius: var(--radius-sm);
      font-size: 14px;
      color: var(--text-main);
      outline: none;
    }
    .subscribe-btn {
      white-space: nowrap;
    }

    /* 页脚 */
    .site-footer {
      background: #071728;
      color: #94A3B8;
      padding: 70px 0 30px 0;
      font-size: 14px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 50px;
    }
    .footer-brand {
      color: #fff;
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .footer-brief {
      line-height: 1.7;
      margin-bottom: 18px;
      font-size: 13px;
    }
    .footer-heading {
      color: #fff;
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 18px;
      letter-spacing: 0.5px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a:hover {
      color: #fff;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 28px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
      flex-wrap: wrap;
      gap: 16px;
    }

    /* 移动端菜单按钮与响应式 */
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--text-main);
    }

    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero-visual-card img {
        height: 360px;
      }
      .calendar-grid, .metrics-bar-grid, .flow-steps-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .topic-grid, .news-list-wrapper, .media-case-grid, .guarantee-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .dark-concept-inner {
        grid-template-columns: 1fr;
      }
      .subscribe-box {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .top-bar {
        display: none;
      }
      .mobile-toggle {
        display: block;
      }
      .nav-menu {
        display: none;
        position: absolute;
        top: 74px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 20px 24px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border-color);
        gap: 16px;
        align-items: flex-start;
      }
      .nav-menu.active {
        display: flex;
      }
      .nav-cta {
        display: none;
      }
      .section-block {
        padding: 60px 0;
      }
      .section-title {
        font-size: 26px;
      }
      .hero-h1 {
        font-size: 28px;
      }
      .calendar-grid, .topic-grid, .insight-row, .news-list-wrapper, 
      .media-case-grid, .metrics-bar-grid, .flow-steps-grid, .guarantee-grid {
        grid-template-columns: 1fr;
      }
      .compliance-checklist {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .subscribe-form {
        flex-direction: column;
      }
    }