/* roulang page: index */
:root {
      --bb-primary: #ff3b30;
      --bb-primary-dark: #d32f2f;
      --bb-secondary: #ff9500;
      --bb-dark: #0f141c;
      --bb-dark-card: #18202c;
      --bb-dark-border: #263345;
      --bb-light-bg: #f8fafc;
      --bb-card-bg: #ffffff;
      --bb-text-main: #1e293b;
      --bb-text-muted: #64748b;
      --bb-accent: #007aff;
      --bb-radius: 16px;
      --bb-shadow-sm: 0 2px 8px rgba(15, 20, 28, 0.06);
      --bb-shadow-md: 0 12px 32px rgba(15, 20, 28, 0.08);
      --bb-shadow-lg: 0 20px 48px rgba(15, 20, 28, 0.12);
      --bb-transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--bb-text-main);
      background-color: #ffffff;
      line-height: 1.7;
      overflow-x: hidden;
    }

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

    /* 顶部导航 */
    .bb-navbar {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid #e2e8f0;
      padding: 16px 0;
      transition: var(--bb-transition);
    }
    .bb-brand-logo {
      font-size: 24px;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--bb-dark);
      display: inline-flex;
      align-items: center;
      gap: 10px;
    }
    .bb-logo-icon {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--bb-primary), var(--bb-secondary));
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 18px;
      box-shadow: 0 4px 12px rgba(255, 59, 48, 0.3);
    }
    .bb-nav-link {
      font-weight: 600;
      font-size: 15px;
      color: var(--bb-text-main);
      padding: 8px 18px;
      border-radius: 8px;
    }
    .bb-nav-link:hover, .bb-nav-link.active {
      color: var(--bb-primary);
      background-color: #fff1f0;
    }

    /* 按钮规范 */
    .btn-bb-primary {
      background: linear-gradient(135deg, var(--bb-primary), #e0281b);
      color: #ffffff;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: 12px;
      border: none;
      box-shadow: 0 6px 18px rgba(255, 59, 48, 0.35);
      transition: var(--bb-transition);
    }
    .btn-bb-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 24px rgba(255, 59, 48, 0.45);
      color: #ffffff;
    }
    .btn-bb-outline {
      background: #ffffff;
      color: var(--bb-dark);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: 12px;
      border: 1px solid #cbd5e1;
      transition: var(--bb-transition);
    }
    .btn-bb-outline:hover {
      border-color: var(--bb-primary);
      color: var(--bb-primary);
      background-color: #fff5f5;
    }

    /* 页面各 Section 统一样式 */
    .bb-section {
      padding: 90px 0;
      position: relative;
    }
    .bb-section-alt {
      background-color: var(--bb-light-bg);
    }
    .bb-section-dark {
      background-color: var(--bb-dark);
      color: #ffffff;
    }
    .bb-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 14px;
      background: rgba(255, 59, 48, 0.1);
      color: var(--bb-primary);
      border-radius: 50px;
      font-size: 13px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .bb-badge-dark {
      background: rgba(255, 255, 255, 0.12);
      color: #38bdf8;
    }
    .bb-section-title {
      font-size: 32px;
      font-weight: 800;
      letter-spacing: -0.5px;
      margin-bottom: 14px;
      line-height: 1.35;
    }
    .bb-section-desc {
      font-size: 16px;
      color: var(--bb-text-muted);
      max-width: 680px;
      margin: 0 auto;
    }
    .bb-section-dark .bb-section-desc {
      color: #94a3b8;
    }

    /* 卡片体系 */
    .bb-card {
      background: var(--bb-card-bg);
      border-radius: var(--bb-radius);
      border: 1px solid #edf2f7;
      box-shadow: var(--bb-shadow-sm);
      padding: 32px;
      height: 100%;
      transition: var(--bb-transition);
    }
    .bb-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--bb-shadow-md);
      border-color: #ffd8d6;
    }
    .bb-dark-box {
      background: var(--bb-dark-card);
      border: 1px solid var(--bb-dark-border);
      border-radius: var(--bb-radius);
      padding: 30px;
      height: 100%;
      transition: var(--bb-transition);
    }
    .bb-dark-box:hover {
      border-color: rgba(255, 59, 48, 0.5);
      transform: translateY(-4px);
    }

    /* 1. Hero 蓝图：竖屏流媒体与终端感 */
    .hero-container {
      background: radial-gradient(circle at 85% 20%, #2a111a 0%, var(--bb-dark) 70%);
      color: #ffffff;
      padding: 80px 0 100px;
      position: relative;
      overflow: hidden;
    }
    .hero-phone-mockup {
      width: 100%;
      max-width: 320px;
      margin: 0 auto;
      background: #090c10;
      border: 8px solid #232d3b;
      border-radius: 40px;
      padding: 16px;
      box-shadow: 0 25px 60px rgba(0,0,0,0.6);
      position: relative;
    }
    .mockup-inner {
      background: linear-gradient(180deg, #1f2735 0%, #0d1117 100%);
      border-radius: 28px;
      padding: 20px 16px;
      height: 480px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      position: relative;
      overflow: hidden;
    }
    .mockup-live-tag {
      position: absolute;
      top: 16px;
      left: 16px;
      background: var(--bb-primary);
      color: #fff;
      font-size: 11px;
      font-weight: 700;
      padding: 3px 8px;
      border-radius: 6px;
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .mockup-interaction {
      display: flex;
      flex-direction: column;
      gap: 12px;
      align-items: flex-end;
      margin-top: auto;
      margin-bottom: 20px;
    }
    .mockup-btn-icon {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: rgba(255,255,255,0.15);
      backdrop-filter: blur(8px);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #ffffff;
      font-size: 16px;
    }

    /* 检查项卡片与合规徽章 */
    .check-item {
      display: flex;
      gap: 16px;
      margin-bottom: 20px;
    }
    .check-icon {
      width: 32px;
      height: 32px;
      background: #e6f7eb;
      color: #10b981;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
      font-size: 16px;
      margin-top: 2px;
    }
    .compliance-badge-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 14px;
      padding: 24px;
      text-align: center;
      transition: var(--bb-transition);
    }
    .compliance-badge-card:hover {
      box-shadow: var(--bb-shadow-md);
      border-color: var(--bb-primary);
    }

    /* 资讯与新闻列表 */
    .news-card-link {
      display: block;
      border-bottom: 1px solid #e2e8f0;
      padding: 20px 0;
      transition: var(--bb-transition);
    }
    .news-card-link:hover {
      padding-left: 8px;
    }
    .news-card-link:last-child {
      border-bottom: none;
    }
    .news-date {
      font-size: 13px;
      color: #94a3b8;
      font-weight: 600;
    }

    /* FAQ 手风琴定制 */
    .bb-accordion .accordion-item {
      border: 1px solid #e2e8f0;
      border-radius: 14px !important;
      margin-bottom: 14px;
      overflow: hidden;
    }
    .bb-accordion .accordion-button {
      font-weight: 700;
      color: var(--bb-dark);
      padding: 20px 24px;
      background: #ffffff;
      box-shadow: none;
    }
    .bb-accordion .accordion-button:not(.collapsed) {
      color: var(--bb-primary);
      background-color: #fff9f9;
    }
    .bb-accordion .accordion-body {
      padding: 0 24px 24px;
      color: var(--bb-text-muted);
      line-height: 1.8;
    }

    /* 页脚 */
    .bb-footer {
      background: #090c10;
      color: #94a3b8;
      padding: 70px 0 30px;
      border-top: 1px solid #1e293b;
    }
    .bb-footer-title {
      color: #f8fafc;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .bb-footer-link {
      color: #94a3b8;
      display: block;
      margin-bottom: 10px;
      font-size: 14px;
    }
    .bb-footer-link:hover {
      color: #ffffff;
    }

/* roulang page: category1 */
:root {
      --bb-primary: #ff3b30;
      --bb-primary-dark: #d32f2f;
      --bb-secondary: #ff9500;
      --bb-dark: #0f141c;
      --bb-dark-card: #18202c;
      --bb-dark-border: #263345;
      --bb-light-bg: #f8fafc;
      --bb-card-bg: #ffffff;
      --bb-text-main: #1e293b;
      --bb-text-muted: #64748b;
      --bb-accent: #007aff;
      --bb-radius: 16px;
      --bb-shadow-sm: 0 2px 8px rgba(15, 20, 28, 0.06);
      --bb-shadow-md: 0 12px 32px rgba(15, 20, 28, 0.08);
      --bb-shadow-lg: 0 20px 48px rgba(15, 20, 28, 0.12);
      --bb-transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--bb-text-main);
      background-color: #ffffff;
      line-height: 1.7;
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--bb-transition);
    }
    /* 顶部导航 */
    .bb-navbar {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid #e2e8f0;
      padding: 16px 0;
      transition: var(--bb-transition);
    }
    .bb-brand-logo {
      font-size: 24px;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--bb-dark);
      display: inline-flex;
      align-items: center;
      gap: 10px;
    }
    .bb-logo-icon {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--bb-primary), var(--bb-secondary));
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 18px;
      box-shadow: 0 4px 12px rgba(255, 59, 48, 0.3);
    }
    .bb-nav-link {
      font-weight: 600;
      font-size: 15px;
      color: var(--bb-text-main);
      padding: 8px 18px;
      border-radius: 8px;
    }
    .bb-nav-link:hover, .bb-nav-link.active {
      color: var(--bb-primary);
      background-color: #fff1f0;
    }
    /* 按钮规范 */
    .btn-bb-primary {
      background: linear-gradient(135deg, var(--bb-primary), #e0281b);
      color: #ffffff;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: 12px;
      border: none;
      box-shadow: 0 6px 18px rgba(255, 59, 48, 0.35);
      transition: var(--bb-transition);
    }
    .btn-bb-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 24px rgba(255, 59, 48, 0.45);
      color: #ffffff;
    }
    .btn-bb-outline {
      background: #ffffff;
      color: var(--bb-dark);
      font-weight: 600;
      padding: 12px 28px;
      border-radius: 12px;
      border: 1px solid #cbd5e1;
      transition: var(--bb-transition);
    }
    .btn-bb-outline:hover {
      border-color: var(--bb-primary);
      color: var(--bb-primary);
      background-color: #fff5f5;
    }
    /* Section 基础 */
    .bb-section {
      padding: 80px 0;
      position: relative;
    }
    .bb-section-alt {
      background-color: var(--bb-light-bg);
    }
    .bb-section-dark {
      background-color: var(--bb-dark);
      color: #ffffff;
    }
    .bb-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 14px;
      background: rgba(255, 59, 48, 0.1);
      color: var(--bb-primary);
      border-radius: 50px;
      font-size: 13px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .bb-badge-dark {
      background: rgba(255, 255, 255, 0.12);
      color: #38bdf8;
    }
    .bb-section-title {
      font-size: 30px;
      font-weight: 800;
      letter-spacing: -0.5px;
      margin-bottom: 14px;
      line-height: 1.35;
    }
    .bb-section-desc {
      font-size: 16px;
      color: var(--bb-text-muted);
      max-width: 720px;
      margin: 0 auto;
    }
    .bb-section-dark .bb-section-desc {
      color: #94a3b8;
    }
    .bb-card {
      background: var(--bb-card-bg);
      border-radius: var(--bb-radius);
      border: 1px solid #edf2f7;
      box-shadow: var(--bb-shadow-sm);
      padding: 32px;
      height: 100%;
      transition: var(--bb-transition);
    }
    .bb-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--bb-shadow-md);
      border-color: #ffd8d6;
    }
    /* 内页专用 Hero：文档帮助中心风格 */
    .doc-hero-section {
      background: linear-gradient(180deg, #0d121a 0%, #151d2a 100%);
      color: #ffffff;
      padding: 70px 0 60px;
      border-bottom: 1px solid var(--bb-dark-border);
    }
    .doc-search-box {
      max-width: 620px;
      margin: 28px auto 0;
      position: relative;
    }
    .doc-search-input {
      width: 100%;
      height: 56px;
      border-radius: 28px;
      background: rgba(255, 255, 255, 0.08);
      border: 1px solid rgba(255, 255, 255, 0.18);
      color: #ffffff;
      padding: 0 54px 0 24px;
      font-size: 15px;
      outline: none;
      transition: var(--bb-transition);
    }
    .doc-search-input:focus {
      background: rgba(255, 255, 255, 0.15);
      border-color: var(--bb-primary);
      box-shadow: 0 0 20px rgba(255, 59, 48, 0.25);
    }
    .doc-search-btn {
      position: absolute;
      right: 8px;
      top: 8px;
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--bb-primary);
      border: none;
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
    }
    .hot-chips {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 18px;
    }
    .chip-item {
      display: inline-block;
      font-size: 13px;
      color: #94a3b8;
      background: rgba(255, 255, 255, 0.05);
      padding: 5px 14px;
      border-radius: 20px;
      border: 1px solid rgba(255, 255, 255, 0.08);
      transition: var(--bb-transition);
    }
    .chip-item:hover {
      color: #ffffff;
      background: rgba(255, 59, 48, 0.2);
      border-color: rgba(255, 59, 48, 0.4);
    }
    /* 架构图层卡片 */
    .arch-layer-card {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: var(--bb-radius);
      padding: 28px;
      position: relative;
      transition: var(--bb-transition);
    }
    .arch-layer-card:hover {
      border-color: var(--bb-primary);
      box-shadow: var(--bb-shadow-md);
    }
    .layer-number {
      width: 36px;
      height: 36px;
      border-radius: 10px;
      background: #fff1f0;
      color: var(--bb-primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 15px;
      margin-bottom: 16px;
    }
    /* 指标看板条 */
    .metric-panel {
      background: #ffffff;
      border: 1px solid #e2e8f0;
      border-radius: 16px;
      padding: 24px;
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .metric-icon-box {
      width: 52px;
      height: 52px;
      border-radius: 14px;
      background: linear-gradient(135deg, rgba(255,59,48,0.1), rgba(255,149,0,0.1));
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--bb-primary);
      font-size: 24px;
      flex-shrink: 0;
    }
    /* 页脚 */
    .bb-footer {
      background-color: var(--bb-dark);
      color: #94a3b8;
      padding: 70px 0 30px;
      border-top: 1px solid var(--bb-dark-border);
    }
    .bb-footer-title {
      color: #ffffff;
      font-weight: 700;
      font-size: 16px;
      margin-bottom: 20px;
    }
    .bb-footer-link {
      display: block;
      color: #94a3b8;
      margin-bottom: 12px;
      font-size: 14px;
      transition: var(--bb-transition);
    }
    .bb-footer-link:hover {
      color: #ffffff;
      padding-left: 4px;
    }