/* School Management System - Custom Styles */

/* Root Variables */
:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --dark-color: #343a40;
    --light-color: #f8f9fa;
    --sidebar-width: 250px;
    --header-height: 60px;
    --transition-speed: 0.3s;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f7fb;
    overflow-x: hidden;
}

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

a {
    text-decoration: none;
    transition: all 0.3s ease;
}

a:hover {
    text-decoration: none;
}

/* Buttons */
.btn {
    border-radius: 8px;
    padding: 8px 20px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-success:hover,
.btn-danger:hover,
.btn-warning:hover,
.btn-info:hover {
    transform: translateY(-2px);
}

/* Cards */
.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
    margin-bottom: 20px;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.card-header {
    background: transparent;
    border-bottom: 2px solid #f0f0f0;
    padding: 15px 20px;
    font-weight: 600;
}

.card-header h5 {
    margin-bottom: 0;
}

/* Sidebar */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    width: var(--sidebar-width);
    background: linear-gradient(135deg, #1a1a2e, #16213e);
    color: white;
    transition: all var(--transition-speed) ease;
    z-index: 1000;
    overflow-y: auto;
}

.sidebar .nav-link {
    color: rgba(255, 255, 255, 0.8);
    padding: 12px 20px;
    margin: 5px 0;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.sidebar .nav-link:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    transform: translateX(5px);
}

.sidebar .nav-link.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.sidebar .nav-link i {
    margin-right: 10px;
    width: 20px;
}

/* Main Content */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    transition: all var(--transition-speed) ease;
}

/* Tables */
.table {
    border-radius: 10px;
    overflow: hidden;
}

.table thead {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.table thead th {
    border: none;
    padding: 12px;
    font-weight: 500;
}

.table tbody tr {
    transition: all 0.3s ease;
}

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

.table tbody td {
    padding: 12px;
    vertical-align: middle;
}

/* Forms */
.form-control,
.form-select {
    border-radius: 8px;
    border: 1px solid #e0e0e0;
    padding: 10px 15px;
    transition: all 0.3s ease;
}

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

.form-label {
    font-weight: 500;
    margin-bottom: 8px;
    color: #495057;
}

/* Progress Bars */
.progress {
    height: 8px;
    border-radius: 10px;
    background-color: #f0f0f0;
}

.progress-bar {
    border-radius: 10px;
    transition: width 0.6s ease;
}

/* Alerts */
.alert {
    border: none;
    border-radius: 10px;
    padding: 15px 20px;
    margin-bottom: 20px;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
}

.alert-warning {
    background-color: #fff3cd;
    color: #856404;
}

.alert-info {
    background-color: #d1ecf1;
    color: #0c5460;
}

/* Badges */
.badge {
    padding: 5px 10px;
    border-radius: 20px;
    font-weight: 500;
}

/* Pagination */
.pagination .page-link {
    border-radius: 8px;
    margin: 0 3px;
    color: var(--primary-color);
    border: none;
    padding: 8px 12px;
}

.pagination .page-item.active .page-link {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

/* Modal */
.modal-content {
    border-radius: 12px;
    border: none;
}

.modal-header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border-radius: 12px 12px 0 0;
}

.modal-header .btn-close {
    filter: brightness(0) invert(1);
}

/* Dashboard Cards */
.stat-card {
    background: white;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.stat-card .stat-icon {
    font-size: 2.5rem;
    opacity: 0.8;
}

.stat-card .stat-value {
    font-size: 2rem;
    font-weight: bold;
    margin: 10px 0;
}

.stat-card .stat-label {
    color: #6c757d;
    font-size: 0.9rem;
}

/* Attendance Calendar */
.calendar {
    background: white;
    border-radius: 12px;
    overflow: hidden;
}

.calendar .day {
    padding: 10px;
    text-align: center;
    border: 1px solid #e0e0e0;
    transition: all 0.3s ease;
}

.calendar .day:hover {
    background-color: #f5f5f5;
}

.calendar .day.present {
    background-color: #d4edda;
    color: #155724;
}

.calendar .day.absent {
    background-color: #f8d7da;
    color: #721c24;
}

.calendar .day.late {
    background-color: #fff3cd;
    color: #856404;
}

/* QR Code Container */
.qr-container {
    background: white;
    padding: 20px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

/* Responsive Design */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .stat-card .stat-value {
        font-size: 1.5rem;
    }
    
    .btn {
        padding: 6px 15px;
        font-size: 0.9rem;
    }
    
    .table-responsive {
        font-size: 0.85rem;
    }
}

/* Print Styles */
@media print {
    .sidebar,
    .btn,
    .navbar,
    .no-print {
        display: none !important;
    }
    
    .main-content {
        margin-left: 0;
        padding: 0;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    body {
        background: white;
    }
}

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

.fade-in {
    animation: fadeIn 0.5s ease;
}

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

.slide-in {
    animation: slideIn 0.3s ease;
}

/* Loading Spinner */
.spinner {
    border: 3px solid #f3f3f3;
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}

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

/* Tooltips */
.tooltip-inner {
    background-color: var(--dark-color);
    border-radius: 8px;
    padding: 5px 10px;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: #555;
}