:root {
    --sidebar-width: 250px;
    --header-height: 60px;

    --color-primary: #3498db;
    --color-primary-dark: #2980b9;
    --color-secondary: #2c3e50;
    --color-secondary-light: #34495e;

    --color-success: #28a745;
    --color-success-light: #d4edda;
    --color-success-dark: #155724;

    --color-warning: #ffc107;
    --color-warning-light: #fff3cd;
    --color-warning-dark: #856404;

    --color-danger: #dc3545;
    --color-danger-light: #f8d7da;
    --color-danger-dark: #721c24;

    --color-info: #17a2b8;
    --color-orange: #fd7e14;
    --color-gray: #6c757d;

    --color-bg: #f8f9fa;
    --color-white: #fff;
    --color-text: #333;
    --color-text-muted: #666;
    --color-text-light: #ecf0f1;

    --color-border: rgba(0,0,0,0.1);
    --color-border-light: rgba(255,255,255,0.1);

    --space-xs: 5px;
    --space-sm: 10px;
    --space-md: 15px;
    --space-lg: 20px;
    --space-xl: 30px;
    --space-2xl: 50px;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 10px;
    --radius-xl: 12px;
    --radius-pill: 20px;

    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 8px rgba(0,0,0,0.15);

    --transition-fast: 0.2s;
    --transition-normal: 0.3s;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--color-bg);
    margin: 0;
    padding: 0;
}

.header {
    height: var(--header-height);
    background-color: var(--color-white);
    box-shadow: var(--shadow-sm);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    padding: 0 var(--space-lg);
}

.header h1 {
    font-size: 1.5rem;
    margin: 0;
    color: var(--color-text);
}

.sync-button {
    margin-left: auto;
}

.sidebar {
    width: var(--sidebar-width);
    background-color: var(--color-secondary);
    position: fixed;
    top: var(--header-height);
    left: 0;
    bottom: 0;
    overflow-y: auto;
    z-index: 999;
}

.sidebar-nav {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar-nav li {
    border-bottom: 1px solid var(--color-border-light);
}

.sidebar-nav a {
    display: block;
    padding: var(--space-md) var(--space-lg);
    color: var(--color-text-light);
    text-decoration: none;
    transition: all var(--transition-normal);
}

.sidebar-nav a:hover {
    background-color: var(--color-secondary-light);
    padding-left: 25px;
}

.sidebar-nav a.active {
    background-color: var(--color-primary);
    border-left: 4px solid var(--color-primary-dark);
}

.sidebar-nav i {
    margin-right: var(--space-sm);
    width: 20px;
    text-align: center;
}

.main-content {
    margin-left: var(--sidebar-width);
    margin-top: var(--header-height);
    padding: var(--space-lg);
    min-height: calc(100vh - var(--header-height));
}

.view-container {
    display: none;
}

.view-container.active {
    display: block;
}

.metric-card {
    background: var(--color-white);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--space-lg);
}

.metric-card h3 {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
}

.metric-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--color-text);
}

.perf-swatch {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 2px;
    margin-right: 4px;
    vertical-align: baseline;
}

#perfTable.perf-devices {
    font-size: 0.875rem;
}

#perfTable.perf-devices thead th {
    padding-left: 4px;
    padding-right: 18px;
}

#perfTable.perf-devices thead .perf-swatch {
    width: 8px;
    height: 8px;
    margin-right: 2px;
}

#perfTable.perf-devices tbody td {
    padding-left: 4px;
    padding-right: 4px;
}

.metric-value.perf-segment-values {
    font-size: 1rem;
    font-weight: normal;
    line-height: 1.6;
}

.change-positive {
    color: var(--color-success);
    font-weight: bold;
}

.change-negative {
    color: var(--color-danger);
    font-weight: bold;
}

.table td {
    vertical-align: middle;
}

.chart-container {
    position: relative;
    height: 400px;
    margin-bottom: var(--space-xl);
}

.hidden {
    display: none;
}

.show {
    display: block;
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
    }

    .sidebar.show {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
    }
}