/* CSS Variables for themes */
:root {
    --bg-color: #f8f9fa;
    --text-color: #333;
    --sidebar-bg: #fff;
    --header-bg: #fff;
    --card-bg: #fff;
    --border-color: #e9ecef;
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --accent-color: #28a745;
    --shadow: rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --sidebar-bg: #1e1e1e;
    --header-bg: #1e1e1e;
    --card-bg: #2a2a2a;
    --border-color: #404040;
    --primary-color: #4dabf7;
    --secondary-color: #adb5bd;
    --accent-color: #51cf66;
    --shadow: rgba(0, 0, 0, 0.3);
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: var(--transition);
}

.container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 250px;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    transition: var(--transition);
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 1000;
    transform: translateX(0);
}

.sidebar.collapsed {
    transform: translateX(-100%);
}

.sidebar-header {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

.sidebar-toggle {
    background: none;
    border: none;
    font-size: 1.2rem;
    color: var(--text-color);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    transition: var(--transition);
}

.sidebar-toggle:hover {
    background-color: var(--border-color);
}

.sidebar-nav ul {
    list-style: none;
    padding: 1rem 0;
}

.sidebar-nav li {
    margin-bottom: 0.5rem;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    color: var(--text-color);
    text-decoration: none;
    transition: var(--transition);
    border-radius: 0 25px 25px 0;
    margin-right: 1rem;
}

.nav-link:hover,
.nav-link.active {
    background-color: var(--primary-color);
    color: #fff;
}

.nav-link i {
    margin-right: 0.75rem;
    width: 20px;
}

/* Main content */
.main-content {
    flex: 1;
    margin-left: 250px;
    transition: var(--transition);
}

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

/* Header */
.header {
    background-color: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 4px var(--shadow);
}

.header-left {
    display: flex;
    align-items: center;
}

.menu-toggle {
    background: none;
    border: none;
    font-size: 1.2rem;
    color: var(--text-color);
    cursor: pointer;
    padding: 0.5rem;
    margin-right: 1rem;
    border-radius: 4px;
    transition: var(--transition);
    display: none;
}

.menu-toggle:hover {
    background-color: var(--border-color);
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 600;
}

.header-right {
    display: flex;
    align-items: center;
}

.theme-toggle {
    background: none;
    border: none;
    font-size: 1.2rem;
    color: var(--text-color);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 4px;
    transition: var(--transition);
}

.theme-toggle:hover {
    background-color: var(--border-color);
}

/* Content */
.content {
    padding: 1.5rem;
}

/* Filters */
.filters {
    display: inline-flex;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 25px;
    padding: 0.25rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    box-shadow: 0 2px 4px var(--shadow);
}

.filter-btn {
    padding: 0.5rem 1rem;
    background-color: transparent;
    border: none;
    border-radius: 20px;
    color: var(--text-color);
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.9rem;
    flex: 1;
    min-width: 100px;
}

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

.filter-btn.active {
    background-color: var(--primary-color);
    color: #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* KPIs */
.kpis {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.kpi-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    display: flex;
    align-items: center;
    box-shadow: 0 2px 8px var(--shadow);
    transition: var(--transition);
    height: 100px;
}

.kpi-card:hover {
    box-shadow: 0 4px 16px var(--shadow);
}

.kpi-icon {
    font-size: 2rem;
    color: var(--primary-color);
    margin-right: 1rem;
    width: 50px;
    text-align: center;
}

.kpi-content h4 {
    font-size: 0.9rem;
    color: var(--secondary-color);
    margin-bottom: 0.25rem;
}

.kpi-content p {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
    margin: 0;
}

/* Charts grid */
.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.chart-card {
    background-color: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 12px var(--shadow);
    transition: var(--transition);
    position: relative;
    height: 450px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.chart-card:hover {
    box-shadow: 0 6px 20px var(--shadow);
    transform: translateY(-2px);
}

.chart-card h3 {
    margin-bottom: 1.5rem;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-color);
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
    flex-shrink: 0;
}

.chart-card canvas {
    max-width: 100%;
    height: 300px;
    display: block;
    margin: 0 auto;
    flex: 1;
}

/* Responsive design */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.collapsed {
        transform: translateX(-100%);
    }

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

    .menu-toggle {
        display: block;
    }

    .header h1 {
        font-size: 1.2rem;
    }

    .filters {
        justify-content: center;
        flex-wrap: wrap;
    }

    .kpis {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }

    .charts-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .content {
        padding: 1rem;
    }

    .filters {
        flex-direction: column;
        align-items: stretch;
    }

    .filter-btn {
        min-width: unset;
        margin-bottom: 0.25rem;
    }

    .kpis {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

    .kpi-card {
        height: auto;
        padding: 0.75rem;
    }

    .chart-card {
        padding: 1.5rem;
        border-radius: 8px;
        height: 400px;
    }

    .chart-card h3 {
        font-size: 1.1rem;
    }

    .chart-card canvas {
        height: 250px;
    }

    .filter-btn {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
    }
}

/* Focus styles */
.nav-link:focus,
.filter-btn:focus,
.theme-toggle:focus,
.sidebar-toggle:focus,
.menu-toggle:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High contrast mode */
@media (prefers-contrast: high) {
    :root {
        --text-color: #000;
        --bg-color: #fff;
    }

    [data-theme="dark"] {
        --text-color: #fff;
        --bg-color: #000;
    }
}

/* Footer */
.footer {
    background-color: var(--header-bg);
    border-top: 1px solid var(--border-color);
    padding: 1rem;
    text-align: center;
    color: var(--secondary-color);
    font-size: 0.9rem;
    margin-top: auto;
}