:root {
            --bg-color: #f5f5f7;
            --card-solid: #ffffff;
            --text-main: #1d1d1f;
            --text-secondary: #86868b;
            --accent: #0071e3;
            --accent-glow: rgba(0, 113, 227, 0.2);
            --success: #34c759;
            --danger: #ff3b30;
            --warning: #ff9500;
            --border-color: rgba(0, 0, 0, 0.08);
            --shadow: 0 20px 40px rgba(0, 0, 0, 0.04), 0 1px 3px rgba(0, 0, 0, 0.02);
            --radius-lg: 20px;
            --radius-md: 14px;
            --radius-sm: 8px;
            --transition: all 0.3s cubic-bezier(0.25, 1, 0.5, 1);
        }

        @media (prefers-color-scheme: dark) {
            :root {
                --bg-color: #000000;
                --card-solid: #1c1c1e;
                --text-main: #f5f5f7;
                --text-secondary: #98989d;
                --accent: #0a84ff;
                --accent-glow: rgba(10, 132, 255, 0.25);
                --success: #30d158;
                --danger: #ff453a;
                --warning: #ffd60a;
                --border-color: rgba(255, 255, 255, 0.12);
                --shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
            }
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
            -webkit-font-smoothing: antialiased;
        }

        body {
            background-color: var(--bg-color);
            color: var(--text-main);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 24px;
        }

        /* SwiftUI Style Outer App Frame */
        .analytics-browser-app {
            width: 100%;
            /* max-width: 920px; */
            background: var(--card-solid);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow);
            border: 1px solid var(--border-color);
            overflow: hidden;
            display: flex;
            flex-direction: column;
            backdrop-filter: blur(25px);
            -webkit-backdrop-filter: blur(25px);
            transition: var(--transition);
        }

        /* Minimized Widget Mode */
        .analytics-browser-app.minimized .app-body,
        .analytics-browser-app.minimized .app-footer {
            display: none;
        }

        .analytics-browser-app.minimized .app-header {
            border-bottom: none;
            padding-bottom: 24px;
        }

        /* Header Control Bar */
        .app-header {
            padding: 24px 28px 18px 28px;
            border-bottom: 1px solid var(--border-color);
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .header-title-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .app-title-group {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .app-title {
            font-size: 20px;
            font-weight: 700;
            letter-spacing: -0.5px;
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .minimize-btn {
            background: var(--bg-color);
            border: 1px solid var(--border-color);
            color: var(--text-main);
            width: 28px;
            height: 28px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            font-size: 14px;
            font-weight: 600;
            transition: var(--transition);
        }

        .minimize-btn:hover {
            background: var(--border-color);
        }

        .status-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 5px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            background: rgba(52, 199, 89, 0.12);
            color: var(--success);
            transition: var(--transition);
        }

        .status-badge.offline-mode {
            background: rgba(255, 59, 48, 0.12);
            color: var(--danger);
        }

        .status-dot {
            width: 7px;
            height: 7px;
            border-radius: 50%;
            background: currentColor;
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0% { transform: scale(0.95); opacity: 0.8; }
            50% { transform: scale(1.2); opacity: 1; }
            100% { transform: scale(0.95); opacity: 0.8; }
        }

        .endpoint-control {
            display: flex;
            gap: 10px;
        }

        .endpoint-input-wrapper {
            flex: 1;
            display: flex;
            align-items: center;
            background: var(--bg-color);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            padding: 8px 14px;
            transition: var(--transition);
        }

        .endpoint-input-wrapper:focus-within {
            border-color: var(--accent);
            box-shadow: 0 0 0 3px var(--accent-glow);
        }

        .endpoint-input-wrapper span {
            font-size: 12px;
            color: var(--text-secondary);
            margin-right: 6px;
            font-weight: 500;
            white-space: nowrap;
        }

        .endpoint-input-wrapper input {
            border: none;
            background: transparent;
            outline: none;
            width: 100%;
            font-size: 13px;
            color: var(--text-main);
            font-weight: 500;
        }

        .fetch-btn {
            background: var(--accent);
            color: white;
            border: none;
            padding: 0 20px;
            border-radius: var(--radius-sm);
            font-size: 13px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
        }

        .fetch-btn:hover {
            opacity: 0.9;
            transform: translateY(-1px);
        }

        .fetch-btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none;
        }

        /* Scrollable Core Body Layout */
        .app-body {
            padding: 24px 28px;
            overflow-y: auto;
            max-height: 72vh;
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        /* SwiftUI Style Overview Grid Cards */
        .metrics-overview {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 14px;
        }

        @media(max-width: 768px) {
            .metrics-overview {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        .metric-card {
            background: var(--bg-color);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 16px;
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .metric-title {
            font-size: 11px;
            font-weight: 600;
            color: var(--text-secondary);
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .metric-value {
            font-size: 21px;
            font-weight: 700;
            letter-spacing: -0.5px;
        }

        .metric-sub {
            font-size: 11px;
            color: var(--text-secondary);
        }

        /* Section Container Cards */
        .section-card {
            background: var(--bg-color);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 20px;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .section-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .section-title {
            font-size: 14px;
            font-weight: 600;
            letter-spacing: -0.2px;
            color: var(--text-main);
        }

        .chart-container {
            position: relative;
            width: 100%;
            height: 250px;
        }

        /* In-Depth Analytics & Frequency Grid */
        .insights-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 14px;
        }

        @media(max-width: 768px) {
            .insights-grid {
                grid-template-columns: 1fr;
            }
        }

        .insight-row {
            display: flex;
            justify-content: space-between;
            padding: 8px 0;
            border-bottom: 1px solid var(--border-color);
            font-size: 13px;
        }

        .insight-row:last-child {
            border-bottom: none;
        }

        .insight-label {
            color: var(--text-secondary);
        }

        .insight-val {
            font-weight: 600;
        }

        /* History Stream Browser Log Table */
        .history-table-wrapper {
            max-height: 200px;
            overflow-y: auto;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            background: var(--card-solid);
        }

        table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            font-size: 12px;
        }

        th {
            background: var(--bg-color);
            position: sticky;
            top: 0;
            padding: 9px 12px;
            font-weight: 600;
            color: var(--text-secondary);
            border-bottom: 1px solid var(--border-color);
            z-index: 2;
        }

        td {
            padding: 9px 12px;
            border-bottom: 1px solid var(--border-color);
        }

        tr:last-child td {
            border-bottom: none;
        }

        .badge-pill {
            padding: 3px 8px;
            border-radius: 4px;
            font-size: 10px;
            font-weight: 600;
        }

        .badge-online { background: rgba(52, 199, 89, 0.15); color: var(--success); }
        .badge-offline { background: rgba(255, 59, 48, 0.15); color: var(--danger); }

        .app-footer {
            padding: 12px 28px;
            background: var(--bg-color);
            border-top: 1px solid var(--border-color);
            font-size: 11px;
            color: var(--text-secondary);
            text-align: center;
        }