/* roulang page: index */
:root {
      --primary: #1E40AF;
      --primary-hover: #1D4ED8;
      --primary-light: #EFF6FF;
      --secondary: #2563EB;
      --accent: #059669;
      --warning: #D97706;
      --slate-900: #0F172A;
      --slate-800: #1E293B;
      --slate-700: #334155;
      --slate-600: #475569;
      --slate-500: #64748B;
      --slate-400: #94A3B8;
      --slate-200: #E2E8F0;
      --slate-100: #F1F5F9;
      --slate-50: #F8FAFC;
      --white: #FFFFFF;
      --sidebar-width: 256px;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-full: 9999px;
      --shadow-sm: 0 1px 3px 0 rgba(15, 23, 42, 0.08);
      --shadow-card: 0 4px 20px -2px rgba(15, 23, 42, 0.06), 0 2px 6px -1px rgba(15, 23, 42, 0.04);
      --shadow-hover: 0 12px 28px -4px rgba(30, 64, 175, 0.12), 0 4px 10px -2px rgba(15, 23, 42, 0.06);
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }

    *, *::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(--slate-50);
      color: var(--slate-800);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, input, select {
      font-family: inherit;
      outline: none;
    }

    /* 布局容器 */
    .app-layout {
      display: flex;
      min-height: 100vh;
    }

    /* 桌面端左侧固定导航 */
    .sidebar-nav {
      position: fixed;
      top: 0;
      left: 0;
      bottom: 0;
      width: var(--sidebar-width);
      background-color: var(--white);
      border-right: 1px solid var(--slate-200);
      display: flex;
      flex-direction: column;
      z-index: 100;
      transition: var(--transition);
    }

    .nav-brand {
      padding: 24px 20px;
      border-bottom: 1px solid var(--slate-100);
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .brand-icon {
      width: 40px;
      height: 40px;
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--white);
      font-weight: 800;
      font-size: 18px;
      letter-spacing: -0.5px;
      box-shadow: 0 4px 10px rgba(37, 99, 235, 0.25);
    }

    .brand-text {
      display: flex;
      flex-direction: column;
    }

    .brand-title {
      font-size: 15px;
      font-weight: 700;
      color: var(--slate-900);
      line-height: 1.2;
    }

    .brand-tag {
      font-size: 11px;
      color: var(--slate-500);
      margin-top: 2px;
      font-weight: 500;
    }

    .nav-menu {
      flex: 1;
      padding: 24px 14px;
      overflow-y: auto;
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .nav-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 12px 14px;
      border-radius: var(--radius-sm);
      font-size: 14px;
      font-weight: 500;
      color: var(--slate-600);
      transition: var(--transition);
    }

    .nav-item:hover {
      color: var(--primary);
      background-color: var(--primary-light);
    }

    .nav-item.active {
      background-color: var(--primary);
      color: var(--white);
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(30, 64, 175, 0.2);
    }

    .nav-category-badge {
      margin-left: auto;
      font-size: 11px;
      padding: 2px 7px;
      border-radius: var(--radius-full);
      background-color: var(--slate-100);
      color: var(--slate-600);
    }

    .nav-item.active .nav-category-badge {
      background-color: rgba(255, 255, 255, 0.2);
      color: var(--white);
    }

    .nav-footer {
      padding: 18px 20px;
      border-top: 1px solid var(--slate-100);
      background-color: var(--slate-50);
    }

    .system-status {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 12px;
      color: var(--slate-600);
    }

    .status-dot {
      width: 8px;
      height: 8px;
      background-color: var(--accent);
      border-radius: 50%;
      box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.2);
    }

    /* 移动端顶栏与抽屉 */
    .mobile-header {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      height: 64px;
      background-color: var(--white);
      border-bottom: 1px solid var(--slate-200);
      padding: 0 16px;
      align-items: center;
      justify-content: space-between;
      z-index: 150;
    }

    .mobile-menu-btn {
      background: none;
      border: 1px solid var(--slate-200);
      border-radius: var(--radius-sm);
      width: 40px;
      height: 40px;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--slate-700);
    }

    .mobile-drawer {
      display: none;
      position: fixed;
      inset: 64px 0 0 0;
      background-color: rgba(15, 23, 42, 0.4);
      z-index: 140;
    }

    .mobile-drawer-inner {
      background-color: var(--white);
      width: 80%;
      max-width: 300px;
      height: 100%;
      padding: 20px 16px;
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    /* 右侧主内容区域 */
    .main-wrapper {
      margin-left: var(--sidebar-width);
      flex: 1;
      display: flex;
      flex-direction: column;
      min-width: 0;
      background-color: var(--slate-50);
    }

    .content-container {
      max-width: 1200px;
      width: 100%;
      margin: 0 auto;
      padding: 0 32px;
    }

    /* 通用板块样式 */
    .section-spacing {
      padding: 72px 0;
      border-bottom: 1px solid var(--slate-200);
    }

    .section-spacing:last-of-type {
      border-bottom: none;
    }

    .section-head {
      margin-bottom: 36px;
    }

    .section-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 12px;
      border-radius: var(--radius-full);
      background-color: var(--primary-light);
      color: var(--primary);
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 26px;
      font-weight: 700;
      color: var(--slate-900);
      line-height: 1.35;
      letter-spacing: -0.3px;
    }

    .section-intro {
      margin-top: 10px;
      color: var(--slate-600);
      font-size: 15px;
      max-width: 820px;
      line-height: 1.7;
    }

    /* 通用卡片与按钮 */
    .standard-card {
      background-color: var(--white);
      border-radius: var(--radius-lg);
      border: 1px solid var(--slate-200);
      padding: 24px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }

    .standard-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(37, 99, 235, 0.3);
    }

    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background-color: var(--primary);
      color: var(--white);
      padding: 12px 24px;
      border-radius: var(--radius-sm);
      font-size: 14px;
      font-weight: 600;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 12px rgba(30, 64, 175, 0.2);
      transition: var(--transition);
    }

    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(30, 64, 175, 0.3);
    }

    .btn-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      background-color: var(--white);
      color: var(--slate-700);
      padding: 12px 22px;
      border-radius: var(--radius-sm);
      font-size: 14px;
      font-weight: 600;
      border: 1px solid var(--slate-200);
      cursor: pointer;
      transition: var(--transition);
    }

    .btn-secondary:hover {
      background-color: var(--slate-100);
      border-color: var(--slate-400);
      color: var(--slate-900);
    }

    /* 板块 1: 核心看板与态势总览（数据驱动流首屏） */
    .hero-panel {
      padding: 48px 0 64px;
      background: linear-gradient(180deg, #FFFFFF 0%, var(--slate-50) 100%);
      border-bottom: 1px solid var(--slate-200);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }

    .hero-h1 {
      font-size: 32px;
      font-weight: 800;
      color: var(--slate-900);
      line-height: 1.25;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 15px;
      color: var(--slate-600);
      line-height: 1.75;
      margin-bottom: 24px;
    }

    .hero-search-box {
      display: flex;
      gap: 8px;
      background: var(--white);
      padding: 6px;
      border-radius: var(--radius-md);
      border: 1px solid var(--slate-200);
      box-shadow: var(--shadow-card);
      max-width: 520px;
      margin-bottom: 24px;
    }

    .hero-input {
      flex: 1;
      border: none;
      padding: 10px 14px;
      font-size: 14px;
      color: var(--slate-800);
      background: transparent;
    }

    .hero-input::placeholder {
      color: var(--slate-400);
    }

    .hero-badges-row {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .stat-mini-pill {
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 12px;
      color: var(--slate-600);
      background: var(--white);
      border: 1px solid var(--slate-200);
      padding: 6px 12px;
      border-radius: var(--radius-full);
    }

    /* 右侧类新零售营运看板 */
    .hero-board {
      background: #0F172A;
      color: var(--white);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: 0 10px 30px rgba(15, 23, 42, 0.18);
      position: relative;
      overflow: hidden;
    }

    .hero-board-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 20px;
      padding-bottom: 14px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .hero-board-title {
      font-size: 15px;
      font-weight: 700;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .hero-board-live {
      font-size: 11px;
      color: #10B981;
      background: rgba(16, 185, 129, 0.15);
      padding: 3px 8px;
      border-radius: var(--radius-full);
      font-weight: 600;
    }

    .board-metric-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 14px;
    }

    .metric-card-dark {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-md);
      padding: 14px 16px;
    }

    .metric-label-dark {
      font-size: 12px;
      color: var(--slate-400);
      margin-bottom: 6px;
    }

    .metric-val-dark {
      font-size: 22px;
      font-weight: 700;
      color: #38BDF8;
      line-height: 1.2;
    }

    .metric-sub-dark {
      font-size: 11px;
      color: #10B981;
      margin-top: 4px;
      display: flex;
      align-items: center;
      gap: 4px;
    }

    /* 板块 2: 服务矩阵货架 */
    .grid-3col {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .shelf-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      border: 1px solid var(--slate-200);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }

    .shelf-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
    }

    .shelf-header {
      padding: 20px 24px;
      border-bottom: 1px solid var(--slate-100);
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .shelf-title {
      font-size: 17px;
      font-weight: 700;
      color: var(--slate-900);
    }

    .tag-active {
      font-size: 11px;
      padding: 3px 8px;
      border-radius: var(--radius-full);
      background: #ECFDF5;
      color: #059669;
      font-weight: 600;
      border: 1px solid #A7F3D0;
    }

    .tag-speed {
      font-size: 11px;
      padding: 3px 8px;
      border-radius: var(--radius-full);
      background: #EFF6FF;
      color: #2563EB;
      font-weight: 600;
      border: 1px solid #BFDBFE;
    }

    .shelf-body {
      padding: 24px;
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .shelf-spec-item {
      display: flex;
      justify-content: space-between;
      font-size: 13px;
      padding-bottom: 8px;
      border-bottom: 1px dashed var(--slate-200);
    }

    .shelf-spec-k {
      color: var(--slate-500);
    }

    .shelf-spec-v {
      font-weight: 600;
      color: var(--slate-800);
    }

    .shelf-desc {
      font-size: 14px;
      color: var(--slate-600);
      line-height: 1.6;
      margin-top: 4px;
    }

    /* 板块 3: 对比表格看板 */
    .compare-container {
      background: var(--white);
      border-radius: var(--radius-lg);
      border: 1px solid var(--slate-200);
      box-shadow: var(--shadow-card);
      overflow-x: auto;
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--slate-200);
    }

    .compare-table th {
      background: var(--slate-50);
      color: var(--slate-700);
      font-weight: 600;
    }

    .compare-table tr:hover td {
      background: #F8FAFC;
    }

    .badge-check {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      color: #059669;
      font-weight: 600;
    }

    /* 板块 4: 里程碑时间线 */
    .timeline-wrap {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .timeline-item {
      background: var(--white);
      border: 1px solid var(--slate-200);
      border-radius: var(--radius-md);
      padding: 20px;
      box-shadow: var(--shadow-card);
      position: relative;
    }

    .timeline-node-time {
      font-size: 12px;
      font-weight: 700;
      color: var(--primary);
      background: var(--primary-light);
      display: inline-block;
      padding: 2px 8px;
      border-radius: var(--radius-sm);
      margin-bottom: 10px;
    }

    .timeline-node-title {
      font-size: 15px;
      font-weight: 700;
      color: var(--slate-900);
      margin-bottom: 8px;
    }

    .timeline-node-desc {
      font-size: 13px;
      color: var(--slate-600);
      line-height: 1.6;
    }

    /* 板块 5: 资讯列表 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .news-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      border: 1px solid var(--slate-200);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }

    .news-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-hover);
    }

    .news-img-box {
      width: 100%;
      height: 180px;
      background: var(--slate-100);
      overflow: hidden;
    }

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

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

    .news-content {
      padding: 20px;
      display: flex;
      flex-direction: column;
      flex: 1;
    }

    .news-meta {
      display: flex;
      justify-content: space-between;
      font-size: 12px;
      color: var(--slate-400);
      margin-bottom: 8px;
    }

    .news-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--slate-900);
      margin-bottom: 8px;
      line-height: 1.4;
    }

    .news-summary {
      font-size: 13px;
      color: var(--slate-600);
      line-height: 1.6;
      flex: 1;
      margin-bottom: 16px;
    }

    .news-btn {
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 板块 6: 平台保障 */
    .grid-4col {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .guarantee-card {
      background: var(--white);
      border: 1px solid var(--slate-200);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      box-shadow: var(--shadow-card);
      text-align: left;
    }

    .guarantee-icon {
      width: 44px;
      height: 44px;
      background: var(--primary-light);
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 20px;
      margin-bottom: 16px;
    }

    .guarantee-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--slate-900);
      margin-bottom: 8px;
    }

    .guarantee-desc {
      font-size: 13px;
      color: var(--slate-600);
      line-height: 1.6;
    }

    /* 板块 7: 多端快速解答 */
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .step-card {
      background: var(--white);
      border: 1px solid var(--slate-200);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-card);
      position: relative;
    }

    .step-num {
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: var(--primary);
      color: var(--white);
      font-size: 14px;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
    }

    .step-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--slate-900);
      margin-bottom: 8px;
    }

    .step-desc {
      font-size: 13px;
      color: var(--slate-600);
      line-height: 1.6;
    }

    /* 板块 8: 网络时延评测看板 */
    .ping-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
    }

    .ping-card {
      background: var(--white);
      border: 1px solid var(--slate-200);
      border-radius: var(--radius-md);
      padding: 16px;
      box-shadow: var(--shadow-card);
    }

    .ping-head {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 12px;
    }

    .ping-city {
      font-size: 14px;
      font-weight: 700;
      color: var(--slate-900);
    }

    .ping-ms {
      font-size: 20px;
      font-weight: 800;
      color: #059669;
    }

    .ping-bar-bg {
      height: 6px;
      background: var(--slate-100);
      border-radius: var(--radius-full);
      overflow: hidden;
      margin-top: 10px;
    }

    .ping-bar-val {
      height: 100%;
      background: linear-gradient(90deg, #10B981 0%, #3B82F6 100%);
      border-radius: var(--radius-full);
    }

    /* 板块 9: 资源分级与高清码流标准 */
    .bitrate-shelf {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .bitrate-card {
      background: var(--white);
      border: 1px solid var(--slate-200);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-card);
    }

    .bitrate-tag {
      display: inline-block;
      font-size: 12px;
      font-weight: 700;
      color: var(--primary);
      background: var(--primary-light);
      padding: 4px 10px;
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
    }

    .bitrate-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--slate-900);
      margin-bottom: 8px;
    }

    .bitrate-param-list {
      list-style: none;
      margin-top: 14px;
      display: flex;
      flex-direction: column;
      gap: 8px;
      font-size: 13px;
      color: var(--slate-600);
    }

    .bitrate-param-list li {
      display: flex;
      justify-content: space-between;
      border-bottom: 1px dotted var(--slate-200);
      padding-bottom: 4px;
    }

    /* 板块 10: 用户反馈 */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .review-card {
      background: var(--white);
      border: 1px solid var(--slate-200);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .review-rating {
      color: #F59E0B;
      font-size: 14px;
      letter-spacing: 2px;
    }

    .review-text {
      font-size: 14px;
      color: var(--slate-700);
      line-height: 1.65;
      flex: 1;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-top: 8px;
    }

    .review-avatar {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 13px;
    }

    .review-meta-name {
      font-size: 13px;
      font-weight: 600;
      color: var(--slate-900);
    }

    .review-meta-role {
      font-size: 11px;
      color: var(--slate-500);
    }

    /* 板块 11: FAQ 手风琴 */
    .faq-container {
      max-width: 860px;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-card {
      background: var(--white);
      border: 1px solid var(--slate-200);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 18px 22px;
      font-size: 15px;
      font-weight: 700;
      color: var(--slate-900);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: var(--white);
      border: none;
      width: 100%;
      text-align: left;
    }

    .faq-arrow {
      transition: var(--transition);
      font-size: 12px;
      color: var(--slate-400);
    }

    .faq-answer {
      padding: 0 22px 18px;
      font-size: 14px;
      color: var(--slate-600);
      line-height: 1.7;
    }

    /* 板块 12: 专属通道表单 */
    .cta-box {
      background: linear-gradient(135deg, #1E40AF 0%, #1E293B 100%);
      border-radius: var(--radius-lg);
      padding: 40px;
      color: var(--white);
      box-shadow: 0 12px 30px rgba(30, 64, 175, 0.2);
    }

    .cta-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 40px;
      align-items: center;
    }

    .cta-h2 {
      font-size: 26px;
      font-weight: 800;
      line-height: 1.35;
      margin-bottom: 12px;
    }

    .cta-p {
      font-size: 14px;
      color: var(--slate-200);
      line-height: 1.7;
      margin-bottom: 20px;
    }

    .cta-form {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 24px;
      color: var(--slate-800);
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .form-label {
      font-size: 12px;
      font-weight: 600;
      color: var(--slate-700);
    }

    .form-control {
      width: 100%;
      padding: 10px 12px;
      border: 1px solid var(--slate-200);
      border-radius: var(--radius-sm);
      font-size: 13px;
      background: var(--slate-50);
      color: var(--slate-800);
    }

    .form-control:focus {
      background: var(--white);
      border-color: var(--primary);
    }

    /* 页脚设计 */
    .site-footer {
      background-color: var(--white);
      border-top: 1px solid var(--slate-200);
      padding: 48px 0 32px;
      color: var(--slate-600);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-brand-title {
      font-size: 16px;
      font-weight: 800;
      color: var(--slate-900);
      margin-bottom: 12px;
    }

    .footer-desc {
      font-size: 13px;
      line-height: 1.7;
      color: var(--slate-500);
    }

    .footer-col-title {
      font-size: 14px;
      font-weight: 700;
      color: var(--slate-800);
      margin-bottom: 14px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
      font-size: 13px;
    }

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

    .footer-bottom {
      border-top: 1px solid var(--slate-100);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 12px;
      color: var(--slate-400);
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .sidebar-nav {
        display: none;
      }
      .mobile-header {
        display: flex;
      }
      .main-wrapper {
        margin-left: 0;
        padding-top: 64px;
      }
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .grid-3col, .timeline-wrap, .news-grid, .bitrate-shelf, .review-grid {
        grid-template-columns: 1fr 1fr;
      }
      .grid-4col, .ping-grid {
        grid-template-columns: 1fr 1fr;
      }
      .cta-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 640px) {
      .content-container {
        padding: 0 16px;
      }
      .grid-3col, .timeline-wrap, .news-grid, .grid-4col, .ping-grid, .bitrate-shelf, .review-grid, .footer-grid, .steps-grid {
        grid-template-columns: 1fr;
      }
      .hero-h1 {
        font-size: 24px;
      }
      .section-title {
        font-size: 20px;
      }
      .board-metric-grid {
        grid-template-columns: 1fr;
      }
      .cta-box {
        padding: 24px 16px;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 8px;
        text-align: center;
      }
    }

/* roulang page: category1 */
:root {
      --primary: #1E40AF;
      --primary-hover: #1D4ED8;
      --primary-light: #EFF6FF;
      --secondary: #2563EB;
      --accent: #059669;
      --warning: #D97706;
      --slate-900: #0F172A;
      --slate-800: #1E293B;
      --slate-700: #334155;
      --slate-600: #475569;
      --slate-500: #64748B;
      --slate-400: #94A3B8;
      --slate-200: #E2E8F0;
      --slate-100: #F1F5F9;
      --slate-50: #F8FAFC;
      --white: #FFFFFF;
      --sidebar-width: 256px;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-full: 9999px;
      --shadow-sm: 0 1px 3px 0 rgba(15, 23, 42, 0.08);
      --shadow-card: 0 4px 20px -2px rgba(15, 23, 42, 0.06), 0 2px 6px -1px rgba(15, 23, 42, 0.04);
      --shadow-hover: 0 12px 28px -4px rgba(30, 64, 175, 0.12), 0 4px 10px -2px rgba(15, 23, 42, 0.06);
      --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    * {
      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(--slate-50);
      color: var(--slate-800);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }
    button, input, select {
      font-family: inherit;
      outline: none;
    }
    .layout-body {
      display: flex;
      min-height: 100vh;
    }

    /* 桌面端左侧固定导航 */
    .sidebar-nav {
      position: fixed;
      top: 0;
      left: 0;
      bottom: 0;
      width: var(--sidebar-width);
      background-color: var(--white);
      border-right: 1px solid var(--slate-200);
      display: flex;
      flex-direction: column;
      z-index: 100;
      transition: var(--transition);
    }
    .nav-brand {
      padding: 24px 20px;
      border-bottom: 1px solid var(--slate-100);
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-icon {
      width: 40px;
      height: 40px;
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--white);
      font-weight: 800;
      font-size: 18px;
      letter-spacing: -0.5px;
      box-shadow: 0 4px 10px rgba(37, 99, 235, 0.25);
      flex-shrink: 0;
    }
    .brand-text {
      display: flex;
      flex-direction: column;
      overflow: hidden;
    }
    .brand-title {
      font-size: 14px;
      font-weight: 700;
      color: var(--slate-900);
      line-height: 1.3;
      white-space: nowrap;
      text-overflow: ellipsis;
      overflow: hidden;
    }
    .brand-tag {
      font-size: 11px;
      color: var(--slate-500);
      margin-top: 2px;
      font-weight: 500;
    }
    .nav-menu {
      flex: 1;
      padding: 24px 14px;
      overflow-y: auto;
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .nav-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 12px 14px;
      border-radius: var(--radius-sm);
      font-size: 14px;
      font-weight: 500;
      color: var(--slate-600);
      transition: var(--transition);
    }
    .nav-item:hover {
      color: var(--primary);
      background-color: var(--primary-light);
    }
    .nav-item.active {
      background-color: var(--primary);
      color: var(--white);
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(30, 64, 175, 0.2);
    }
    .nav-category-badge {
      margin-left: auto;
      font-size: 11px;
      padding: 2px 7px;
      border-radius: var(--radius-full);
      background-color: var(--slate-100);
      color: var(--slate-600);
    }
    .nav-item.active .nav-category-badge {
      background-color: rgba(255, 255, 255, 0.2);
      color: var(--white);
    }
    .nav-footer {
      padding: 18px 20px;
      border-top: 1px solid var(--slate-100);
      background-color: var(--slate-50);
    }
    .status-indicator {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 12px;
      color: var(--slate-600);
    }
    .status-dot {
      width: 8px;
      height: 8px;
      border-radius: var(--radius-full);
      background-color: var(--accent);
      box-shadow: 0 0 0 2px rgba(5, 150, 105, 0.2);
    }

    /* 移动端顶栏与抽屉 */
    .mobile-header {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      height: 64px;
      background-color: var(--white);
      border-bottom: 1px solid var(--slate-200);
      padding: 0 16px;
      align-items: center;
      justify-content: space-between;
      z-index: 150;
    }
    .mobile-menu-btn {
      background: none;
      border: 1px solid var(--slate-200);
      border-radius: var(--radius-sm);
      width: 40px;
      height: 40px;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--slate-700);
      font-size: 18px;
    }
    .mobile-drawer {
      display: none;
      position: fixed;
      inset: 64px 0 0 0;
      background-color: rgba(15, 23, 42, 0.4);
      z-index: 140;
    }
    .mobile-drawer.open {
      display: block;
    }
    .mobile-drawer-inner {
      background-color: var(--white);
      width: 80%;
      max-width: 300px;
      height: 100%;
      padding: 20px 16px;
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    /* 主内容区 */
    .main-wrapper {
      margin-left: var(--sidebar-width);
      flex: 1;
      display: flex;
      flex-direction: column;
      min-width: 0;
      background-color: var(--slate-50);
    }
    .content-container {
      max-width: 1200px;
      width: 100%;
      margin: 0 auto;
      padding: 0 32px;
    }
    .section-spacing {
      padding: 64px 0;
      border-bottom: 1px solid var(--slate-200);
    }
    .section-spacing:last-of-type {
      border-bottom: none;
    }
    .section-head {
      margin-bottom: 32px;
    }
    .section-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 4px 12px;
      border-radius: var(--radius-full);
      background-color: var(--primary-light);
      color: var(--primary);
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .section-title {
      font-size: 24px;
      font-weight: 700;
      color: var(--slate-900);
      line-height: 1.35;
      letter-spacing: -0.3px;
    }
    .section-intro {
      margin-top: 8px;
      color: var(--slate-600);
      font-size: 14px;
      max-width: 840px;
    }

    /* 板块 1: 分类专属头部 */
    .cat-header-box {
      padding: 40px 0 32px;
      border-bottom: 1px solid var(--slate-200);
      background: linear-gradient(180deg, #FFFFFF 0%, var(--slate-50) 100%);
    }
    .cat-breadcrumb {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 13px;
      color: var(--slate-500);
      margin-bottom: 16px;
    }
    .cat-breadcrumb a:hover {
      color: var(--primary);
    }
    .cat-breadcrumb span.separator {
      color: var(--slate-400);
    }
    .cat-title-row {
      display: flex;
      align-items: flex-start;
      justify-content: space-between;
      gap: 20px;
      flex-wrap: wrap;
    }
    .cat-h1 {
      font-size: 30px;
      font-weight: 800;
      color: var(--slate-900);
      letter-spacing: -0.5px;
      line-height: 1.25;
    }
    .cat-count-pill {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 14px;
      background-color: #ECFDF5;
      border: 1px solid #A7F3D0;
      color: #047857;
      font-size: 13px;
      font-weight: 600;
      border-radius: var(--radius-full);
      white-space: nowrap;
    }
    .cat-lead {
      margin-top: 12px;
      font-size: 15px;
      color: var(--slate-600);
      max-width: 880px;
      line-height: 1.6;
    }

    /* 板块 2: 多维筛选胶囊 */
    .filter-panel {
      background-color: var(--white);
      border: 1px solid var(--slate-200);
      border-radius: var(--radius-xl, 16px);
      padding: 20px 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .filter-row {
      display: flex;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
    }
    .filter-label {
      font-size: 13px;
      font-weight: 600;
      color: var(--slate-700);
      min-width: 72px;
    }
    .filter-pills {
      display: flex;
      align-items: center;
      gap: 8px;
      flex-wrap: wrap;
    }
    .pill-item {
      display: inline-block;
      padding: 6px 14px;
      font-size: 13px;
      font-weight: 500;
      color: var(--slate-600);
      background-color: var(--slate-100);
      border-radius: var(--radius-full);
      border: 1px solid transparent;
      cursor: pointer;
      transition: var(--transition);
    }
    .pill-item:hover {
      background-color: var(--primary-light);
      color: var(--primary);
    }
    .pill-item.active {
      background-color: var(--primary);
      color: var(--white);
      border-color: var(--primary);
    }

    /* 板块 3: 核心网格卡片矩阵 */
    .grid-matrix {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .item-card {
      background-color: var(--white);
      border: 1px solid var(--slate-200);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .item-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-hover);
      border-color: #BFDBFE;
    }
    .card-thumb-wrap {
      position: relative;
      aspect-ratio: 16 / 9;
      background-color: var(--slate-100);
      overflow: hidden;
    }
    .card-thumb {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .item-card:hover .card-thumb {
      transform: scale(1.04);
    }
    .card-badge-overlay {
      position: absolute;
      top: 10px;
      left: 10px;
      padding: 3px 8px;
      background-color: rgba(15, 23, 42, 0.75);
      backdrop-filter: blur(4px);
      color: var(--white);
      font-size: 11px;
      font-weight: 600;
      border-radius: 4px;
    }
    .card-body {
      padding: 16px;
      display: flex;
      flex-direction: column;
      flex: 1;
    }
    .card-meta-line {
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 12px;
      color: var(--slate-500);
      margin-bottom: 8px;
    }
    .card-title {
      font-size: 15px;
      font-weight: 700;
      color: var(--slate-900);
      line-height: 1.4;
      margin-bottom: 8px;
    }
    .card-desc {
      font-size: 13px;
      color: var(--slate-600);
      line-height: 1.55;
      margin-bottom: 14px;
      flex: 1;
    }
    .card-footer-action {
      border-top: 1px solid var(--slate-100);
      padding-top: 12px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .codec-tag {
      font-size: 11px;
      font-weight: 600;
      padding: 2px 6px;
      border-radius: 4px;
      background-color: var(--slate-100);
      color: var(--slate-700);
    }
    .btn-access {
      display: inline-flex;
      align-items: center;
      gap: 4px;
      padding: 5px 12px;
      font-size: 12px;
      font-weight: 600;
      color: var(--primary);
      background-color: var(--primary-light);
      border-radius: var(--radius-sm);
      transition: var(--transition);
    }
    .btn-access:hover {
      background-color: var(--primary);
      color: var(--white);
    }

    /* 板块 4: 分类深度解析双列 */
    .depth-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .depth-card {
      background-color: var(--white);
      border: 1px solid var(--slate-200);
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: var(--shadow-card);
    }
    .depth-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--slate-900);
      margin-bottom: 14px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .depth-dot {
      width: 10px;
      height: 10px;
      border-radius: 2px;
      background-color: var(--secondary);
    }
    .depth-text {
      font-size: 14px;
      color: var(--slate-600);
      line-height: 1.7;
      margin-bottom: 16px;
    }
    .spec-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .spec-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 13px;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      background-color: var(--slate-50);
      border: 1px solid var(--slate-100);
    }
    .spec-name {
      color: var(--slate-600);
    }
    .spec-value {
      font-weight: 600;
      color: var(--slate-800);
    }

    /* 板块 5: 排行榜 */
    .ranking-box {
      background-color: var(--white);
      border: 1px solid var(--slate-200);
      border-radius: var(--radius-lg);
      padding: 24px 28px;
      box-shadow: var(--shadow-card);
    }
    .rank-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .rank-item {
      display: flex;
      align-items: center;
      gap: 16px;
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      background-color: var(--slate-50);
      border: 1px solid var(--slate-100);
      transition: var(--transition);
    }
    .rank-item:hover {
      background-color: #F8FAFC;
      border-color: #CBD5E1;
      transform: translateX(4px);
    }
    .rank-num {
      width: 28px;
      height: 28px;
      border-radius: var(--radius-full);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 13px;
      color: var(--slate-600);
      background-color: var(--slate-200);
      flex-shrink: 0;
    }
    .rank-num.top1 {
      background-color: #FEF3C7;
      color: #B45309;
    }
    .rank-num.top2 {
      background-color: #E0E7FF;
      color: #3730A3;
    }
    .rank-num.top3 {
      background-color: #E2E8F0;
      color: #475569;
    }
    .rank-main {
      flex: 1;
      min-width: 0;
    }
    .rank-name {
      font-size: 14px;
      font-weight: 700;
      color: var(--slate-900);
      white-space: nowrap;
      text-overflow: ellipsis;
      overflow: hidden;
    }
    .rank-zone {
      font-size: 12px;
      color: var(--slate-500);
      margin-top: 2px;
    }
    .rank-trend {
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 12px;
      font-weight: 600;
      color: var(--accent);
      flex-shrink: 0;
    }

    /* 板块 6: 使用注意事项指引卡 */
    .tips-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .tip-card {
      background-color: var(--white);
      border: 1px solid var(--slate-200);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-card);
    }
    .tip-icon-header {
      width: 36px;
      height: 36px;
      border-radius: var(--radius-sm);
      background-color: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 16px;
      margin-bottom: 14px;
    }
    .tip-card-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--slate-900);
      margin-bottom: 8px;
    }
    .tip-card-text {
      font-size: 13px;
      color: var(--slate-600);
      line-height: 1.65;
    }

    /* 板块 7: 延伸导航与查看更多 */
    .explore-box {
      background: linear-gradient(135deg, var(--white) 0%, var(--primary-light) 100%);
      border: 1px solid #BFDBFE;
      border-radius: var(--radius-lg);
      padding: 36px;
      text-align: center;
      box-shadow: var(--shadow-card);
    }
    .explore-title {
      font-size: 20px;
      font-weight: 700;
      color: var(--slate-900);
      margin-bottom: 10px;
    }
    .explore-desc {
      font-size: 14px;
      color: var(--slate-600);
      max-width: 600px;
      margin: 0 auto 20px;
    }
    .btn-more-trigger {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 12px 28px;
      background-color: var(--primary);
      color: var(--white);
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      box-shadow: 0 4px 12px rgba(30, 64, 175, 0.25);
      border: none;
      cursor: pointer;
      transition: var(--transition);
    }
    .btn-more-trigger:hover {
      background-color: var(--primary-hover);
      transform: translateY(-1px);
    }

    /* 页脚 */
    .site-footer {
      background-color: var(--white);
      border-top: 1px solid var(--slate-200);
      padding: 56px 0 32px;
      margin-top: auto;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-brand-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--slate-900);
      margin-bottom: 12px;
    }
    .footer-desc {
      font-size: 13px;
      color: var(--slate-600);
      line-height: 1.65;
    }
    .footer-col-title {
      font-size: 14px;
      font-weight: 700;
      color: var(--slate-800);
      margin-bottom: 14px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
      font-size: 13px;
      color: var(--slate-600);
    }
    .footer-links a:hover {
      color: var(--primary);
    }
    .footer-bottom {
      border-top: 1px solid var(--slate-100);
      padding-top: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 12px;
      color: var(--slate-500);
      flex-wrap: wrap;
      gap: 12px;
    }

    /* 响应式断点 */
    @media (max-width: 1023px) {
      .sidebar-nav {
        display: none;
      }
      .mobile-header {
        display: flex;
      }
      .main-wrapper {
        margin-left: 0;
        margin-top: 64px;
      }
      .content-container {
        padding: 0 20px;
      }
      .grid-matrix {
        grid-template-columns: repeat(2, 1fr);
      }
      .tips-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 640px) {
      .grid-matrix {
        grid-template-columns: 1fr;
      }
      .depth-grid {
        grid-template-columns: 1fr;
      }
      .cat-h1 {
        font-size: 22px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }