/* MicroAge Dashboard - Dual Theme System */

/* ============================================
   CSS Custom Properties (Theme Variables)
   ============================================ */

:root {
    /* Light Theme (Default) - Red & White */
    --primary: #C8102E;
    --primary-hover: #a00d25;
    --primary-light: #f8d7da;
    --secondary: #6c757d;
    --background: #ffffff;
    --background-alt: #f8f9fa;
    --surface: #ffffff;
    --surface-hover: #f1f3f5;
    --sidebar-bg: #1a1a2e;
    --sidebar-text: #ffffff;
    --sidebar-hover: #2d2d44;
    --sidebar-active: #C8102E;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
    --border: #dee2e6;
    --success: #28a745;
    --warning: #ffc107;
    --danger: #dc3545;
    --info: #17a2b8;
    --card-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    /* Dark Theme - Blue & Black */
    --primary: #0066CC;
    --primary-hover: #0052a3;
    --primary-light: #1a3a5c;
    --secondary: #8b949e;
    --background: #0d1117;
    --background-alt: #161b22;
    --surface: #21262d;
    --surface-hover: #30363d;
    --sidebar-bg: #010409;
    --sidebar-text: #c9d1d9;
    --sidebar-hover: #21262d;
    --sidebar-active: #0066CC;
    --text-primary: #f0f6fc;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --border: #30363d;
    --success: #3fb950;
    --warning: #d29922;
    --danger: #f85149;
    --info: #58a6ff;
    --card-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

/* ============================================
   Base Styles
   ============================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    color: var(--primary-hover);
}

/* ============================================
   Layout
   ============================================ */

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

/* ============================================
   Sidebar
   ============================================ */

.sidebar {
    width: 260px;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    left: 0;
    top: 0;
    z-index: 1000;
    transition: var(--transition);
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.sidebar-logo {
    width: 40px;
    height: 40px;
    background: var(--primary);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.25rem;
}

.sidebar-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 1rem 0;
}

.nav-section {
    margin-bottom: 1.5rem;
}

.nav-section-title {
    padding: 0.5rem 1.5rem;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    font-weight: 600;
}

.nav-item {
    display: flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    color: var(--sidebar-text);
    transition: var(--transition);
    cursor: pointer;
    gap: 0.75rem;
}

.nav-item:hover {
    background: var(--sidebar-hover);
}

.nav-item.active {
    background: var(--sidebar-active);
    border-left: 3px solid var(--primary);
}

.nav-item-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-item-text {
    flex: 1;
}

.nav-item-badge {
    background: var(--danger);
    color: white;
    font-size: 0.7rem;
    padding: 0.15rem 0.5rem;
    border-radius: 10px;
    font-weight: 600;
}

/* Sidebar Footer */
.sidebar-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.theme-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem;
    background: var(--sidebar-hover);
    border-radius: 8px;
    cursor: pointer;
}

.theme-toggle-label {
    font-size: 0.875rem;
}

.theme-toggle-switch {
    width: 48px;
    height: 24px;
    background: var(--secondary);
    border-radius: 12px;
    position: relative;
    transition: var(--transition);
}

.theme-toggle-switch::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    top: 2px;
    left: 2px;
    transition: var(--transition);
}

[data-theme="dark"] .theme-toggle-switch {
    background: var(--primary);
}

[data-theme="dark"] .theme-toggle-switch::after {
    left: 26px;
}

/* ============================================
   Main Content
   ============================================ */

.main-content {
    flex: 1;
    margin-left: 260px;
    padding: 2rem;
    background: var(--background-alt);
    min-height: 100vh;
}

.page-header {
    margin-bottom: 2rem;
}

.page-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.page-subtitle {
    color: var(--text-secondary);
}

/* ============================================
   Cards
   ============================================ */

.card {
    background: var(--surface);
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.card-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.card-body {
    padding: 1.5rem;
}

/* ============================================
   Stats Grid
   ============================================ */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--surface);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.stat-icon {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-icon.primary {
    background: var(--primary-light);
    color: var(--primary);
}

.stat-icon.success {
    background: rgba(40, 167, 69, 0.15);
    color: var(--success);
}

.stat-icon.warning {
    background: rgba(255, 193, 7, 0.15);
    color: var(--warning);
}

.stat-icon.danger {
    background: rgba(220, 53, 69, 0.15);
    color: var(--danger);
}

.stat-content {
    flex: 1;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* ============================================
   Dashboard Grid
   ============================================ */

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

@media (max-width: 1200px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Tables
   ============================================ */

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

.table th,
.table td {
    padding: 0.875rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.table th {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.table tr:hover {
    background: var(--surface-hover);
}

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

/* ============================================
   Status Badges
   ============================================ */

.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    gap: 0.35rem;
}

.badge-success {
    background: rgba(40, 167, 69, 0.15);
    color: var(--success);
}

.badge-warning {
    background: rgba(255, 193, 7, 0.15);
    color: var(--warning);
}

.badge-danger {
    background: rgba(220, 53, 69, 0.15);
    color: var(--danger);
}

.badge-info {
    background: rgba(23, 162, 184, 0.15);
    color: var(--info);
}

.badge::before {
    content: '';
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: currentColor;
}

/* ============================================
   Alert Banner
   ============================================ */

.alert {
    padding: 1rem 1.5rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.alert-warning {
    background: rgba(255, 193, 7, 0.15);
    border: 1px solid var(--warning);
    color: var(--warning);
}

.alert-info {
    background: rgba(23, 162, 184, 0.15);
    border: 1px solid var(--info);
    color: var(--info);
}

.alert-danger {
    background: rgba(220, 53, 69, 0.15);
    border: 1px solid var(--danger);
    color: var(--danger);
}

/* ============================================
   Buttons
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1.25rem;
    border-radius: 8px;
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-secondary {
    background: var(--surface);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--surface-hover);
}

/* ============================================
   Placeholder Content
   ============================================ */

.placeholder-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    text-align: center;
}

.placeholder-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--background-alt);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-muted);
}

.placeholder-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.placeholder-text {
    color: var(--text-secondary);
    max-width: 400px;
}

/* ============================================
   Empty State
   ============================================ */

.empty-state {
    padding: 3rem;
    text-align: center;
    color: var(--text-secondary);
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

/* ============================================
   Loading Spinner
   ============================================ */

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 768px) {
    .sidebar {
        width: 70px;
    }
    
    .sidebar-title,
    .nav-section-title,
    .nav-item-text,
    .theme-toggle-label {
        display: none;
    }
    
    .sidebar-header {
        justify-content: center;
    }
    
    .nav-item {
        justify-content: center;
        padding: 1rem;
    }
    
    .main-content {
        margin-left: 70px;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .main-content {
        padding: 1rem;
    }
}