/* roulang page: index */
:root {
            --sys-bg: #f8fafc;
            --sys-surface: #ffffff;
            --sys-border: #e2e8f0;
            --sys-border-hover: #cbd5e1;
            --sys-text: #0f172a;
            --sys-muted: #64748b;
            --sys-primary: #2563eb;
            --sys-primary-hover: #1d4ed8;
            --sys-success: #059669;
            --sys-warning: #d97706;
            --sys-purple: #7c3aed;
            --sys-card-radius: 8px;
            --sys-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.05);
            --sys-shadow-hover: 0 8px 16px -4px rgba(15, 23, 42, 0.08);
            --sys-font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        }

        body {
            font-family: var(--sys-font);
            background-color: var(--sys-bg);
            color: var(--sys-text);
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: var(--sys-primary);
            text-decoration: none;
            transition: color 0.15s ease;
        }
        a:hover {
            color: var(--sys-primary-hover);
        }

        /* 顶部导航 Header */
        .site-header {
            background: #ffffff;
            border-bottom: 1px solid var(--sys-border);
            position: sticky;
            top: 0;
            z-index: 1020;
        }
        .navbar-brand-text {
            font-weight: 700;
            font-size: 1.15rem;
            color: var(--sys-text);
            letter-spacing: -0.02em;
        }
        .brand-badge {
            font-size: 0.75rem;
            background-color: #eff6ff;
            color: var(--sys-primary);
            border: 1px solid #bfdbfe;
            border-radius: 4px;
            padding: 2px 6px;
            font-weight: 600;
        }
        .header-search {
            background-color: #f1f5f9;
            border: 1px solid var(--sys-border);
            border-radius: 6px;
            padding: 0.375rem 0.75rem;
            font-size: 0.875rem;
            width: 240px;
            transition: all 0.2s ease;
        }
        .header-search:focus {
            outline: none;
            background-color: #ffffff;
            border-color: var(--sys-primary);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
        }
        .kbd-badge {
            background: #ffffff;
            border: 1px solid #cbd5e1;
            box-shadow: 0 1px 0 rgba(0,0,0,0.08);
            border-radius: 3px;
            padding: 1px 5px;
            font-size: 0.7rem;
            color: var(--sys-muted);
        }
        .nav-link-custom {
            font-size: 0.925rem;
            font-weight: 500;
            color: var(--sys-muted);
            padding: 0.5rem 0.85rem !important;
            border-radius: 6px;
        }
        .nav-link-custom:hover, .nav-link-custom.active {
            color: var(--sys-primary);
            background-color: #f8fafc;
        }

        /* 数据驱动面板容器通用样式 */
        .section-wrap {
            padding: 4.5rem 0;
            border-bottom: 1px solid var(--sys-border);
        }
        .section-header {
            margin-bottom: 2.75rem;
        }
        .section-subtitle {
            font-size: 0.825rem;
            font-weight: 700;
            letter-spacing: 0.08em;
            color: var(--sys-primary);
            text-transform: uppercase;
            margin-bottom: 0.5rem;
        }
        .section-title {
            font-weight: 700;
            font-size: 1.85rem;
            color: var(--sys-text);
            line-height: 1.3;
        }
        .section-desc {
            font-size: 1rem;
            color: var(--sys-muted);
            margin-top: 0.75rem;
            line-height: 1.75;
            max-width: 860px;
        }

        /* 卡片基础架构 */
        .sys-card {
            background: var(--sys-surface);
            border: 1px solid var(--sys-border);
            border-radius: var(--sys-card-radius);
            box-shadow: var(--sys-shadow);
            padding: 1.5rem;
            height: 100%;
            transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
        }
        .sys-card:hover {
            transform: translateY(-2px);
            box-shadow: var(--sys-shadow-hover);
            border-color: var(--sys-border-hover);
        }

        /* 首屏指标看板 (Hero) */
        .hero-banner {
            background-color: #ffffff;
            border-bottom: 1px solid var(--sys-border);
            padding: 4rem 0 3.5rem;
        }
        .metric-card {
            background-color: #f8fafc;
            border: 1px solid var(--sys-border);
            border-radius: var(--sys-card-radius);
            padding: 1.25rem 1.5rem;
            position: relative;
        }
        .metric-value {
            font-size: 2.1rem;
            font-weight: 700;
            color: var(--sys-text);
            font-feature-settings: "tnum";
            font-variant-numeric: tabular-nums;
            line-height: 1.15;
        }
        .metric-trend {
            font-size: 0.8rem;
            color: var(--sys-success);
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .live-dot {
            width: 8px;
            height: 8px;
            background-color: var(--sys-success);
            border-radius: 50%;
            display: inline-block;
            box-shadow: 0 0 0 2px rgba(5, 150, 105, 0.2);
            animation: pulse-dot 2s infinite;
        }
        @keyframes pulse-dot {
            0% { transform: scale(0.95); opacity: 0.8; }
            50% { transform: scale(1.15); opacity: 1; }
            100% { transform: scale(0.95); opacity: 0.8; }
        }

        /* 按钮重构 */
        .btn-sys-primary {
            background-color: var(--sys-primary);
            border-color: var(--sys-primary);
            color: #ffffff;
            font-weight: 600;
            font-size: 0.95rem;
            padding: 0.625rem 1.35rem;
            border-radius: 6px;
            box-shadow: 0 1px 2px rgba(0,0,0,0.05);
        }
        .btn-sys-primary:hover {
            background-color: var(--sys-primary-hover);
            border-color: var(--sys-primary-hover);
            color: #ffffff;
        }
        .btn-sys-secondary {
            background-color: #ffffff;
            border: 1px solid var(--sys-border);
            color: var(--sys-text);
            font-weight: 600;
            font-size: 0.95rem;
            padding: 0.625rem 1.35rem;
            border-radius: 6px;
        }
        .btn-sys-secondary:hover {
            background-color: #f1f5f9;
            color: var(--sys-text);
            border-color: #cbd5e1;
        }

        /* 参数表格 */
        .table-custom {
            border: 1px solid var(--sys-border);
            border-radius: var(--sys-card-radius);
            overflow: hidden;
            background: #ffffff;
        }
        .table-custom table {
            margin-bottom: 0;
        }
        .table-custom th {
            background-color: #f8fafc;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--sys-muted);
            border-bottom: 1px solid var(--sys-border);
            padding: 1rem 1.25rem;
        }
        .table-custom td {
            font-size: 0.9rem;
            color: var(--sys-text);
            border-bottom: 1px solid var(--sys-border);
            padding: 1rem 1.25rem;
            vertical-align: middle;
        }
        .table-custom tr:last-child td {
            border-bottom: none;
        }

        /* 时间线里程碑 */
        .timeline-box {
            position: relative;
            padding-left: 2rem;
            border-left: 2px solid #e2e8f0;
        }
        .timeline-node {
            position: relative;
            margin-bottom: 2.25rem;
        }
        .timeline-node::before {
            content: '';
            position: absolute;
            left: calc(-2rem - 6px);
            top: 6px;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background-color: var(--sys-primary);
            border: 2px solid #ffffff;
            box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.25);
        }

        /* 故障排查步骤徽章 */
        .step-badge {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 32px;
            height: 32px;
            border-radius: 6px;
            background-color: #eff6ff;
            color: var(--sys-primary);
            font-weight: 700;
            font-size: 0.95rem;
            margin-bottom: 1rem;
        }

        /* 手风琴 FAQ 深度定制 */
        .accordion-custom .accordion-item {
            border: 1px solid var(--sys-border);
            border-radius: var(--sys-card-radius) !important;
            margin-bottom: 0.875rem;
            background-color: #ffffff;
            overflow: hidden;
        }
        .accordion-custom .accordion-button {
            font-size: 1rem;
            font-weight: 600;
            color: var(--sys-text);
            background-color: #ffffff;
            padding: 1.15rem 1.35rem;
            box-shadow: none;
        }
        .accordion-custom .accordion-button:not(.collapsed) {
            color: var(--sys-primary);
            background-color: #f8fafc;
            border-bottom: 1px solid var(--sys-border);
        }
        .accordion-custom .accordion-body {
            padding: 1.25rem 1.35rem;
            font-size: 0.925rem;
            color: #334155;
            line-height: 1.75;
        }

        /* 页脚规范 */
        .site-footer {
            background-color: #ffffff;
            border-top: 1px solid var(--sys-border);
            padding: 4rem 0 2.5rem;
            color: var(--sys-muted);
            font-size: 0.875rem;
        }
        .footer-title {
            font-size: 0.925rem;
            font-weight: 700;
            color: var(--sys-text);
            margin-bottom: 1.25rem;
        }
        .footer-link-list {
            list-style: none;
            padding-left: 0;
            margin-bottom: 0;
        }
        .footer-link-list li {
            margin-bottom: 0.65rem;
        }
        .footer-link-list a {
            color: var(--sys-muted);
        }
        .footer-link-list a:hover {
            color: var(--sys-primary);
        }

        /* 响应式断点控制 */
        @media (max-width: 991.98px) {
            .header-search {
                width: 100%;
                margin-top: 0.75rem;
            }
            .metric-value {
                font-size: 1.75rem;
            }
        }
        @media (max-width: 767.98px) {
            .section-wrap {
                padding: 3rem 0;
            }
            .section-title {
                font-size: 1.5rem;
            }
        }

/* roulang page: category1 */
:root {
      --sys-bg: #f8fafc;
      --sys-surface: #ffffff;
      --sys-border: #e2e8f0;
      --sys-border-hover: #cbd5e1;
      --sys-text: #0f172a;
      --sys-muted: #64748b;
      --sys-primary: #2563eb;
      --sys-primary-hover: #1d4ed8;
      --sys-success: #059669;
      --sys-warning: #d97706;
      --sys-purple: #7c3aed;
      --sys-card-radius: 8px;
      --sys-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.05);
      --sys-shadow-hover: 0 8px 16px -4px rgba(15, 23, 42, 0.08);
      --sys-font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    body {
      font-family: var(--sys-font);
      background-color: var(--sys-bg);
      color: var(--sys-text);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: var(--sys-primary);
      text-decoration: none;
      transition: color 0.15s ease;
    }
    a:hover {
      color: var(--sys-primary-hover);
    }
    .site-header {
      background: #ffffff;
      border-bottom: 1px solid var(--sys-border);
      position: sticky;
      top: 0;
      z-index: 1020;
    }
    .navbar-brand-text {
      font-weight: 700;
      font-size: 1.15rem;
      color: var(--sys-text);
      letter-spacing: -0.02em;
    }
    .brand-badge {
      font-size: 0.75rem;
      background-color: #eff6ff;
      color: var(--sys-primary);
      border: 1px solid #bfdbfe;
      border-radius: 4px;
      padding: 2px 6px;
      font-weight: 600;
    }
    .header-search {
      background-color: #f1f5f9;
      border: 1px solid var(--sys-border);
      border-radius: 6px;
      padding: 0.375rem 0.75rem;
      font-size: 0.875rem;
      width: 240px;
      transition: all 0.2s ease;
    }
    .header-search:focus {
      outline: none;
      background-color: #ffffff;
      border-color: var(--sys-primary);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
    }
    .kbd-badge {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      box-shadow: 0 1px 0 rgba(0,0,0,0.08);
      border-radius: 3px;
      padding: 1px 5px;
      font-size: 0.7rem;
      color: var(--sys-muted);
    }
    .nav-link-custom {
      font-size: 0.925rem;
      font-weight: 500;
      color: var(--sys-muted);
      padding: 0.5rem 0.85rem !important;
      border-radius: 6px;
    }
    .nav-link-custom:hover, .nav-link-custom.active {
      color: var(--sys-primary);
      background-color: #f8fafc;
    }
    .section-wrap {
      padding: 3.5rem 0;
      border-bottom: 1px solid var(--sys-border);
    }
    .section-header {
      margin-bottom: 2rem;
    }
    .section-subtitle {
      font-size: 0.8rem;
      font-weight: 700;
      letter-spacing: 0.08em;
      color: var(--sys-primary);
      text-transform: uppercase;
      margin-bottom: 0.35rem;
    }
    .section-title {
      font-weight: 700;
      font-size: 1.65rem;
      color: var(--sys-text);
      line-height: 1.3;
    }
    .section-desc {
      font-size: 0.95rem;
      color: var(--sys-muted);
      margin-top: 0.5rem;
      line-height: 1.7;
    }
    .sys-card {
      background: var(--sys-surface);
      border: 1px solid var(--sys-border);
      border-radius: var(--sys-card-radius);
      box-shadow: var(--sys-shadow);
      padding: 1.5rem;
      height: 100%;
      transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .sys-card:hover {
      transform: translateY(-2px);
      box-shadow: var(--sys-shadow-hover);
      border-color: var(--sys-border-hover);
    }
    .btn-sys-primary {
      background-color: var(--sys-primary);
      border: 1px solid var(--sys-primary);
      color: #ffffff;
      font-weight: 600;
      font-size: 0.9rem;
      padding: 0.55rem 1.25rem;
      border-radius: 6px;
    }
    .btn-sys-primary:hover {
      background-color: var(--sys-primary-hover);
      border-color: var(--sys-primary-hover);
      color: #ffffff;
    }
    .btn-sys-secondary {
      background-color: #ffffff;
      border: 1px solid var(--sys-border);
      color: var(--sys-text);
      font-weight: 600;
      font-size: 0.9rem;
      padding: 0.55rem 1.25rem;
      border-radius: 6px;
    }
    .btn-sys-secondary:hover {
      background-color: #f1f5f9;
      color: var(--sys-text);
      border-color: var(--sys-border-hover);
    }
    .filter-group-title {
      font-size: 0.8rem;
      font-weight: 700;
      color: var(--sys-muted);
      text-transform: uppercase;
      letter-spacing: 0.05em;
      margin-bottom: 0.5rem;
    }
    .filter-chip {
      display: inline-block;
      font-size: 0.8rem;
      padding: 0.25rem 0.75rem;
      border: 1px solid var(--sys-border);
      background: #ffffff;
      border-radius: 4px;
      color: var(--sys-text);
      cursor: pointer;
      margin-right: 0.4rem;
      margin-bottom: 0.4rem;
      user-select: none;
      transition: all 0.15s ease;
    }
    .filter-chip.active {
      background: #eff6ff;
      border-color: var(--sys-primary);
      color: var(--sys-primary);
      font-weight: 600;
    }
    .filter-chip:hover:not(.active) {
      background: #f1f5f9;
    }
    .tier-badge {
      font-size: 0.7rem;
      font-weight: 700;
      padding: 0.15rem 0.5rem;
      border-radius: 4px;
      letter-spacing: 0.03em;
    }
    .tier-4k {
      background: #fef2f2;
      color: #dc2626;
      border: 1px solid #fecaca;
    }
    .tier-2k {
      background: #faf5ff;
      color: #7c3aed;
      border: 1px solid #e9d5ff;
    }
    .tier-1080p {
      background: #ecfdf5;
      color: #059669;
      border: 1px solid #a7f3d0;
    }
    .video-item-card {
      background: #ffffff;
      border: 1px solid var(--sys-border);
      border-radius: var(--sys-card-radius);
      box-shadow: var(--sys-shadow);
      transition: all 0.2s ease;
      display: flex;
      flex-direction: column;
      height: 100%;
      overflow: hidden;
    }
    .video-item-card:hover {
      transform: translateY(-2px);
      box-shadow: var(--sys-shadow-hover);
      border-color: var(--sys-border-hover);
    }
    .video-thumb-ph {
      height: 160px;
      background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #94a3b8;
      position: relative;
    }
    .video-thumb-ph .overlay-info {
      position: absolute;
      bottom: 8px;
      right: 8px;
      background: rgba(0, 0, 0, 0.75);
      color: #ffffff;
      font-size: 0.72rem;
      padding: 2px 6px;
      border-radius: 3px;
      font-family: monospace;
    }
    .video-thumb-ph .stream-protocol {
      position: absolute;
      top: 8px;
      left: 8px;
      background: rgba(37, 99, 235, 0.85);
      color: #ffffff;
      font-size: 0.7rem;
      padding: 1px 5px;
      border-radius: 3px;
      font-weight: 600;
    }
    .param-spec-table th, .param-spec-table td {
      padding: 0.65rem 0.85rem;
      font-size: 0.85rem;
      border-color: var(--sys-border);
    }
    .guide-card-icon {
      width: 40px;
      height: 40px;
      border-radius: 8px;
      background: #eff6ff;
      color: var(--sys-primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      margin-bottom: 1rem;
    }
    .ping-indicator {
      display: inline-block;
      width: 8px;
      height: 8px;
      border-radius: 50%;
      margin-right: 6px;
    }
    .ping-good { background-color: var(--sys-success); }
    .ping-fair { background-color: var(--sys-warning); }
    .live-dot {
      width: 8px;
      height: 8px;
      background-color: var(--sys-success);
      border-radius: 50%;
      display: inline-block;
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(5, 150, 105, 0.5); }
      70% { box-shadow: 0 0 0 6px rgba(5, 150, 105, 0); }
      100% { box-shadow: 0 0 0 0 rgba(5, 150, 105, 0); }
    }
    .footer-wrap {
      background: #ffffff;
      border-top: 1px solid var(--sys-border);
      padding: 3.5rem 0 2rem;
    }
    .footer-brand {
      font-weight: 700;
      font-size: 1.15rem;
      color: var(--sys-text);
    }
    .footer-link {
      color: var(--sys-muted);
      transition: color 0.15s ease;
    }
    .footer-link:hover {
      color: var(--sys-primary);
    }
    .sidebar-doc-nav {
      position: sticky;
      top: 5rem;
      background: #ffffff;
      border: 1px solid var(--sys-border);
      border-radius: var(--sys-card-radius);
      padding: 1.25rem;
    }
    .sidebar-link {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0.45rem 0.65rem;
      font-size: 0.85rem;
      color: var(--sys-muted);
      border-radius: 4px;
      margin-bottom: 2px;
      transition: all 0.15s;
    }
    .sidebar-link:hover, .sidebar-link.active {
      color: var(--sys-primary);
      background-color: #f1f5f9;
      font-weight: 600;
    }
    @media (max-width: 991.98px) {
      .section-wrap { padding: 2.5rem 0; }
      .section-title { font-size: 1.45rem; }
      .header-search { width: 180px; }
    }

/* roulang: framework shim */
/* 覆盖 Bootstrap 等对 a/btn 的全局默认，避免导航出现下划线/蓝链 */
.site-header a,.site-header a:hover,.navbar a,.navbar a:hover,.nav-links a,.nav-links a:hover,header nav a,header nav a:hover{text-decoration:none}
.site-header .btn,.navbar .btn,.nav-cta{text-decoration:none}