/* CSS Custom Properties for Design System */
:root {
    /* Colors - 2025 Modern Design System */
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    --success-500: #10b981;
    --success-100: #d1fae5;
    --error-500: #ef4444;
    --error-100: #fee2e2;
    --warning-500: #f59e0b;
    --warning-100: #fef3c7;
    
    /* Spacing Scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-12: 3rem;
    --space-16: 4rem;
    
    /* Typography */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    
    /* Layout */
    --sidebar-width: 280px;
    --sidebar-width-collapsed: 72px;
    --header-height: 80px;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--gray-50);
    color: var(--gray-900);
    overflow-x: hidden;
}

/* Dashboard Layout */
.dashboard-container {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    min-height: 100vh;
    transition: grid-template-columns var(--transition-base);
}

.dashboard-container.sidebar-collapsed {
    grid-template-columns: var(--sidebar-width-collapsed) 1fr;
}

/* Sidebar Styles */
.sidebar {
    background: linear-gradient(135deg, var(--gray-900) 0%, var(--gray-800) 100%);
    color: white;
    display: flex;
    flex-direction: column;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-xl);
    z-index: 1000;
}

.sidebar-header {
    padding: var(--space-6);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--font-size-xl);
    font-weight: 700;
    transition: opacity var(--transition-base);
}

.logo i {
    color: var(--primary-500);
    font-size: var(--font-size-2xl);
}

.sidebar-toggle {
    background: none;
    border: none;
    color: white;
    font-size: var(--font-size-lg);
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.sidebar-toggle:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.sidebar-nav {
    flex: 1;
    padding: var(--space-4) 0;
}

.sidebar-nav ul {
    list-style: none;
}

.nav-item {
    margin: var(--space-1) var(--space-4);
}

.nav-item a {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.nav-item a::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, var(--primary-500), var(--primary-600));
    opacity: 0;
    transition: opacity var(--transition-fast);
    z-index: -1;
}

.nav-item a:hover,
.nav-item.active a {
    color: white;
    transform: translateX(4px);
}

.nav-item a:hover::before,
.nav-item.active a::before {
    opacity: 1;
}

.nav-item i {
    font-size: var(--font-size-lg);
    width: 20px;
    text-align: center;
}

/* Main Content */
.main-content {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background-color: var(--gray-50);
}

/* Header */
.header {
    background: white;
    padding: 0 var(--space-8);
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: var(--shadow-sm);
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-left h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-1);
}

.header-left p {
    color: var(--gray-500);
    font-size: var(--font-size-sm);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--space-6);
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
}

.search-box i {
    position: absolute;
    left: var(--space-3);
    color: var(--gray-400);
    z-index: 1;
}

.search-box input {
    padding: var(--space-3) var(--space-3) var(--space-3) var(--space-8);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-lg);
    background: var(--gray-50);
    transition: all var(--transition-fast);
    width: 300px;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-500);
    background: white;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    cursor: pointer;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-lg);
    transition: background-color var(--transition-fast);
}

.user-profile:hover {
    background-color: var(--gray-100);
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--primary-500);
}

.username {
    font-weight: 500;
    color: var(--gray-700);
}

/* Dashboard Content */
.dashboard-content {
    flex: 1;
    padding: var(--space-8);
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* KPI Section */
.kpi-section {
    margin-bottom: var(--space-8);
}

.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-6);
}

.kpi-card {
    background: white;
    padding: var(--space-6);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    gap: var(--space-4);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.kpi-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-500), var(--primary-600));
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.kpi-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.kpi-card:hover::before {
    transform: scaleX(1);
}

.kpi-icon {
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    color: white;
    width: 60px;
    height: 60px;
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    box-shadow: var(--shadow-lg);
}

.kpi-content {
    flex: 1;
}

.kpi-title {
    font-size: var(--font-size-sm);
    color: var(--gray-500);
    margin-bottom: var(--space-2);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.kpi-value {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--space-2);
}

.kpi-change {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.kpi-change.positive {
    color: var(--success-500);
}

.kpi-change.negative {
    color: var(--error-500);
}

/* Charts Section */
.charts-section {
    margin-bottom: var(--space-8);
}

.charts-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    grid-template-rows: auto auto;
    gap: var(--space-6);
}

.chart-container {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
    overflow: hidden;
    transition: all var(--transition-base);
}

.chart-container:hover {
    box-shadow: var(--shadow-lg);
}

.chart-container.large {
    grid-row: span 2;
}

.chart-header {
    padding: var(--space-6);
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: linear-gradient(135deg, var(--gray-50), white);
}

.chart-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--gray-900);
}

.chart-filter {
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    background: white;
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.chart-filter:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.chart-body {
    padding: var(--space-6);
    height: 300px;
}

.chart-container.large .chart-body {
    height: 400px;
}

/* Table Section */
.table-section {
    margin-bottom: var(--space-8);
}

.table-container {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-200);
    overflow: hidden;
}

.table-header {
    padding: var(--space-6);
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: linear-gradient(135deg, var(--gray-50), white);
}

.table-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--gray-900);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    color: white;
    border: none;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.table-body {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: var(--space-4);
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.data-table th {
    background-color: var(--gray-50);
    font-weight: 600;
    color: var(--gray-700);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.data-table tr {
    transition: background-color var(--transition-fast);
}

.data-table tr:hover {
    background-color: var(--gray-50);
}

.status-badge {
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-md);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.status-badge.completed {
    background-color: var(--success-100);
    color: var(--success-500);
}

.status-badge.pending {
    background-color: var(--warning-100);
    color: var(--warning-500);
}

.status-badge.cancelled {
    background-color: var(--error-100);
    color: var(--error-500);
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: all var(--transition-base);
}

.loading-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-spinner {
    text-align: center;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--gray-200);
    border-top-color: var(--primary-500);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--space-4);
}

.loading-spinner p {
    color: var(--gray-600);
    font-weight: 500;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .dashboard-container {
        grid-template-columns: var(--sidebar-width-collapsed) 1fr;
    }
    
    .sidebar .logo span,
    .sidebar .nav-item span {
        display: none;
    }
    
    .charts-grid {
        grid-template-columns: 1fr;
    }
    
    .dashboard-content {
        padding: var(--space-4);
    }
}

/* Mobile Overlay */
.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.sidebar-overlay.active {
    opacity: 1;
    visibility: visible;
}

@media (max-width: 768px) {
    .dashboard-container {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        position: fixed;
        left: -100%;
        width: var(--sidebar-width);
        height: 100vh;
        z-index: 1000;
        transition: left var(--transition-base);
        box-shadow: var(--shadow-xl);
    }
    
    .sidebar.open {
        left: 0;
    }
    
    .header {
        padding: 0 var(--space-4);
    }
    
    .search-box input {
        width: 200px;
    }
    
    .kpi-grid {
        grid-template-columns: 1fr;
    }
    
    .user-profile .username {
        display: none;
    }
    
    /* Hide text labels on collapsed sidebar */
    .sidebar-collapsed .sidebar .logo span,
    .sidebar-collapsed .sidebar .nav-item span {
        display: none;
    }
}

@media (max-width: 480px) {
    .header {
        flex-direction: column;
        height: auto;
        padding: var(--space-4);
        gap: var(--space-4);
    }
    
    .header-right {
        width: 100%;
        justify-content: space-between;
    }
    
    .search-box input {
        width: 100%;
        max-width: 200px;
    }
}

/* Toggle Switch Styles */
.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--gray-300);
    transition: all var(--transition-fast);
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: all var(--transition-fast);
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
}

input:checked + .slider {
    background-color: var(--primary-500);
}

input:checked + .slider:before {
    transform: translateX(26px);
}

.slider:hover {
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Action buttons */
.btn-secondary {
    background: var(--gray-500);
    color: white;
    border: none;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}