/* CSS Variables for consistent design system */
:root {
    /* Bootstrap color overrides */
    --bs-primary: #0d6efd;
    --bs-secondary: #6c757d;
    --bs-success: #198754;
    --bs-info: #0dcaf0;
    --bs-warning: #ffc107;
    --bs-danger: #dc3545;
    /* Colors */
    --primary-color: #2c5282;
    --secondary-color: #667eea;
    --success-color: #065f46;
    --warning-color: #92400e;
    --danger-color: #dc2626;
    --info-color: #0369a1;
    
    /* Background colors */
    --bg-white: #ffffff;
    --bg-gray-50: #f8fafc;
    --bg-gray-100: #f1f5f9;
    --bg-gray-200: #e2e8f0;
    --bg-success-light: #d1fae5;
    --bg-warning-light: #fef3c7;
    --bg-danger-light: #fee2e2;
    
    /* Text colors */
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border radius */
    --radius-sm: 8px;
    --radius-md: 10px;
    --radius-lg: 15px;
    --radius-full: 50%;
    
    /* Shadows */
    --shadow-sm: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.15);
    --shadow-lg: 0 4px 12px rgba(102, 126, 234, 0.4);
    
    /* Transitions */
    --transition-fast: all 0.2s ease;
    --transition-normal: all 0.3s ease;
}

/* Base Styling */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: #f8f9fa;
}

/* Navigation Styling */
.navbar-nav .nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 0.375rem;
    transition: background-color 0.3s ease;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--bs-primary) 0%, #495057 100%);
    color: white;
    padding: 4rem 0;
    margin-bottom: 2rem;
}

.hero-section h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero-section p {
    font-size: 1.25rem;
    opacity: 0.9;
}

/* Utility Classes */
.card {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-fast);
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card-header {
    color: var(--primary-color);
    border-bottom: 2px solid var(--bg-gray-200);
    padding-bottom: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.section {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
}

.grid-auto {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.grid-auto-lg {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

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

.flex-center {
    display: flex;
    justify-content: center;
    align-items: center;
}

.flex-end {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: var(--spacing-md);
}

/* Status badges */
.badge {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
}

.badge-success {
    background: var(--bg-success-light);
    color: var(--success-color);
}

.badge-warning {
    background: var(--bg-warning-light);
    color: var(--warning-color);
}

.badge-danger {
    background: var(--bg-danger-light);
    color: var(--danger-color);
}

/* Form styles */
.form-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    padding-top: var(--spacing-xl);
    border-top: 2px solid var(--bg-gray-200);
    margin-top: var(--spacing-xl);
}

.help-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

.required-field {
    color: var(--danger-color);
}

/* Meta information display */
.meta-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.meta-item {
    display: flex;
    flex-direction: column;
}

.meta-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.meta-value {
    font-weight: 600;
    color: var(--text-primary);
}

/* Image placeholders */
.image-placeholder {
    background: var(--bg-gray-200);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
}

/* Common gradients */
.gradient-primary {
    background: linear-gradient(135deg, var(--secondary-color) 0%, #764ba2 100%);
    color: white;
}

.gradient-danger {
    background: linear-gradient(135deg, #f56565 0%, #e53e3e 100%);
    color: white;
}

/* Button enhancements */
.btn-gradient {
    background: linear-gradient(135deg, var(--secondary-color) 0%, #764ba2 100%);
    border: none;
    color: white;
    transition: var(--transition-normal);
}

.btn-gradient:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white;
}

/* Empty states */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-xl);
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}