/* LMS Main Stylesheet */

/* Global Styles */
:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --success-color: #56ab2f;
    --warning-color: #f093fb;
    --danger-color: #ff6b6b;
    --info-color: #4facfe;
    --light-color: #f8f9fa;
    --dark-color: #2c3e50;
    --border-radius: 10px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    margin-bottom: 1rem;
}

p {
    margin-bottom: 1rem;
}

/* Links */
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

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

/* Buttons */
.btn {
    border-radius: 25px;
    padding: 10px 20px;
    font-weight: 500;
    border: none;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-size: 0.9rem;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
}

.btn-success {
    background: linear-gradient(135deg, #56ab2f 0%, #a8e6cf 100%);
    color: white;
}

.btn-warning {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
}

.btn-info {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    color: white;
}

.btn-danger {
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a6f 100%);
    color: white;
}

/* Cards */
.card {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    overflow: hidden;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.card-header {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-bottom: 1px solid #dee2e6;
    padding: 1.25rem;
}

.card-body {
    padding: 1.5rem;
}

/* Forms */
.form-control {
    border: 2px solid #e9ecef;
    border-radius: var(--border-radius);
    padding: 12px 15px;
    font-size: 1rem;
    transition: var(--transition);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.25);
}

.form-label {
    font-weight: 600;
    color: #495057;
    margin-bottom: 0.5rem;
}

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

.table th {
    border: none;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
    padding: 1rem;
}

.table td {
    border: none;
    padding: 1rem;
    vertical-align: middle;
}

.table-hover tbody tr:hover {
    background-color: rgba(102, 126, 234, 0.05);
}

/* Progress Bars */
.progress {
    height: 10px;
    border-radius: 5px;
    background-color: #e9ecef;
    overflow: hidden;
}

.progress-bar {
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 5px;
    transition: width 0.6s ease;
}

/* Badges */
.badge {
    padding: 0.5rem 0.75rem;
    border-radius: 15px;
    font-weight: 500;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.alert-success {
    background: linear-gradient(135deg, #d4edda 0%, #c3e6cb 100%);
    color: #155724;
    border-left: 4px solid #28a745;
}

.alert-danger {
    background: linear-gradient(135deg, #f8d7da 0%, #f5c6cb 100%);
    color: #721c24;
    border-left: 4px solid #dc3545;
}

.alert-warning {
    background: linear-gradient(135deg, #fff3cd 0%, #ffeaa7 100%);
    color: #856404;
    border-left: 4px solid #ffc107;
}

.alert-info {
    background: linear-gradient(135deg, #d1ecf1 0%, #bee5eb 100%);
    color: #0c5460;
    border-left: 4px solid #17a2b8;
}

/* Navigation */
.navbar {
    background: white !important;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    padding: 1rem 0;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary-color) !important;
}

.nav-link {
    font-weight: 500;
    color: #495057 !important;
    transition: var(--transition);
    padding: 0.75rem 1rem !important;
    border-radius: 20px;
    margin: 0 0.25rem;
}

.nav-link:hover {
    color: var(--primary-color) !important;
    background-color: rgba(102, 126, 234, 0.1);
}

.nav-link.active {
    color: white !important;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

/* Dropdown */
.dropdown-menu {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    padding: 0.5rem 0;
}

.dropdown-item {
    padding: 0.75rem 1.25rem;
    font-weight: 500;
    transition: var(--transition);
}

.dropdown-item:hover {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
}

/* Modal */
.modal-content {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
}

.modal-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    border-bottom: none;
    border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.modal-footer {
    border-top: 1px solid #dee2e6;
    padding: 1rem 1.5rem;
}

/* Utilities */
.text-gradient {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bg-gradient-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

.bg-gradient-success {
    background: linear-gradient(135deg, #56ab2f 0%, #a8e6cf 100%);
}

.bg-gradient-warning {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.bg-gradient-info {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.bg-gradient-danger {
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a6f 100%);
}

.shadow-lg {
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1) !important;
}

.border-radius {
    border-radius: var(--border-radius);
}

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

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.animate-fade-in {
    animation: fadeIn 0.6s ease-out;
}

.animate-slide-in-left {
    animation: slideInLeft 0.6s ease-out;
}

/* Loading Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 2s linear infinite;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .btn {
        font-size: 0.85rem;
        padding: 8px 16px;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .table-responsive {
        font-size: 0.9rem;
    }
    
    .h1, h1 { font-size: 1.75rem; }
    .h2, h2 { font-size: 1.5rem; }
    .h3, h3 { font-size: 1.25rem; }
}

@media (max-width: 576px) {
    .btn {
        font-size: 0.8rem;
        padding: 6px 12px;
    }
    
    .card {
        margin-bottom: 1rem;
    }
    
    .form-control {
        font-size: 0.9rem;
        padding: 10px 12px;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1a1a1a;
        --text-color: #f0f0f0;
        --card-bg: #2d2d2d;
    }
    
    body {
        background-color: var(--bg-color);
        color: var(--text-color);
    }
    
    .card {
        background-color: var(--card-bg);
        color: var(--text-color);
    }
    
    .navbar {
        background-color: var(--card-bg) !important;
    }
}

/* Print Styles */
@media print {
    .sidebar,
    .navbar,
    .btn,
    .dropdown {
        display: none !important;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ccc;
    }
    
    body {
        background: white;
        color: black;
    }
}