/**
 * Modern CSS Styles for PHP Routing System
 * 
 * A clean, modern stylesheet that enhances the Bootstrap theme
 * with custom styling for better user experience.
 * 
 * @author Your Name
 * @version 1.0
 */

/* CSS Variables for easy customization */
:root {
    --primary-color: #3b82f6;
    --primary-dark: #2563eb;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --light-bg: #f8fafc;
    --dark-bg: #1e293b;
    --border-color: #e2e8f0;
    --text-color: #334155;
    --text-muted: #64748b;
    --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);
    --border-radius: 0.5rem;
    --transition: all 0.3s ease;
}

/* Global Styles */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-bg);
}

/* Enhanced Navigation */
.navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%) !important;
    backdrop-filter: blur(10px);
    border: none !important;
    box-shadow: var(--shadow-md);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1030;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: white !important;
    text-decoration: none;
}

.navbar-nav .nav-link {
    color: rgba(255, 255, 255, 0.9) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    border-radius: var(--border-radius);
    transition: var(--transition);
    margin: 0 0.25rem;
}

.navbar-nav .nav-link:hover {
    color: white !important;
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-1px);
}

.navbar-toggler {
    border: none;
    padding: 0.25rem 0.5rem;
}

.navbar-toggler:focus {
    box-shadow: none;
}

/* Main Content Area */
.main-content {
    min-height: calc(100vh - 200px);
    padding: 2rem 0;
    padding-top: 100px; /* Increased padding to accommodate navbar */
}

/* Cards and Containers */
.card {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    background: white;
}

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

.card-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border-radius: var(--border-radius) var(--border-radius) 0 0 !important;
    border: none;
    padding: 1.25rem;
}

.card-body {
    padding: 1.5rem;
}

/* Buttons */
.btn {
    border-radius: var(--border-radius);
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    transition: var(--transition);
    border: none;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), #1d4ed8);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    color: white;
}

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

.btn-secondary:hover {
    background-color: #475569;
    transform: translateY(-1px);
    color: white;
}

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

.btn-success:hover {
    background-color: #059669;
    transform: translateY(-1px);
    color: white;
}

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

.btn-danger:hover {
    background-color: #dc2626;
    transform: translateY(-1px);
    color: white;
}

/* Forms */
.form-control {
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 0.75rem 1rem;
    transition: var(--transition);
    background-color: white;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(59, 130, 246, 0.25);
}

.form-label {
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

/* Alerts */
.alert {
    border: none;
    border-radius: var(--border-radius);
    padding: 1rem 1.25rem;
    margin-bottom: 1.5rem;
}

.alert-success {
    background-color: #d1fae5;
    color: #065f46;
    border-left: 4px solid var(--success-color);
}

.alert-danger {
    background-color: #fee2e2;
    color: #991b1b;
    border-left: 4px solid var(--danger-color);
}

.alert-warning {
    background-color: #fef3c7;
    color: #92400e;
    border-left: 4px solid var(--warning-color);
}

.alert-info {
    background-color: #dbeafe;
    color: #1e40af;
    border-left: 4px solid var(--primary-color);
}

/* Tables */
.table {
    background: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.table thead th {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    font-weight: 600;
    padding: 1rem;
}

.table tbody td {
    padding: 1rem;
    border-color: var(--border-color);
    vertical-align: middle;
}

.table tbody tr:hover {
    background-color: var(--light-bg);
}

/* Footer */
.footer {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 2rem 0;
    margin-top: 3rem;
}

.footer a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
}

.footer a:hover {
    color: white;
}

/* Utility Classes */
.text-gradient {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

.bg-gradient {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
}

.shadow-custom {
    box-shadow: var(--shadow-lg);
}

.border-custom {
    border: 2px solid var(--border-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .navbar-nav {
        padding-top: 1rem;
    }
    
    .navbar-nav .nav-link {
        margin: 0.25rem 0;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.slide-in {
    animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
    from {
        transform: translateX(-100%);
    }
    to {
        transform: translateX(0);
    }
}

/* Loading Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Code Blocks */
.code-block {
    background-color: #1e293b;
    color: #e2e8f0;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    overflow-x: auto;
    margin: 1rem 0;
}

.code-block .keyword {
    color: #60a5fa;
}

.code-block .string {
    color: #34d399;
}

.code-block .comment {
    color: #9ca3af;
    font-style: italic;
}

/* Feature Cards */
.feature-card {
    text-align: center;
    padding: 2rem;
    border-radius: var(--border-radius);
    background: rgb(66, 66, 66);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    height: 100%;
}

.feature-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    color: white;
    font-size: 1.5rem;
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --light-bg: #0f172a;
        --text-color: #e2e8f0;
        --text-muted: #94a3b8;
        --border-color: #334155;
    }
    
    body {
        background-color: var(--dark-bg);
        color: var(--text-color);
    }
    
    .card {
        background-color: #1e293b;
        color: var(--text-color);
    }
    
    .form-control {
        background-color: #1e293b;
        border-color: var(--border-color);
        color: var(--text-color);
    }
    
    .table {
        background-color: #1e293b;
        color: var(--text-color);
    }
}