/* ========================================
   MAIN CSS - Core Styles for School Management System
   ======================================== */

/* ========================================
   GLOBAL STYLES
   ======================================== */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
}

/* ========================================
   BOOTSTRAP OVERRIDES
   ======================================== */
.navbar-brand {
    font-weight: bold;
}

.table-responsive {
    margin-top: 20px;
}

.btn-group-sm > .btn, .btn-sm {
    font-size: 0.875rem;
}

.form-control:focus {
    border-color: #0d6efd;
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

.card {
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    border: 1px solid rgba(0, 0, 0, 0.125);
    border-radius: 0.5rem;
}

.card:hover {
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    transition: box-shadow 0.3s ease;
}

.alert {
    border-radius: 0.375rem;
    border: none;
}

/* ========================================
   LAYOUT COMPONENTS
   ======================================== */
.content-card {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

.page-header {
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid #e9ecef;
}

/* ========================================
   NAVIGATION
   ======================================== */
.navbar {
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.navbar-nav .nav-link {
    font-weight: 500;
    transition: color 0.3s ease;
}

.navbar-nav .nav-link:hover {
    color: #0d6efd !important;
}

/* ========================================
   BUTTONS
   ======================================== */
.btn {
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
}

.btn i {
    margin-right: 5px;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.btn:active {
    transform: translateY(0);
}

/* Button variants */
.btn-action {
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
}

.btn-view {
    background-color: #17a2b8;
    color: white;
}

.btn-view:hover {
    background-color: #138496;
    color: white;
}

.btn-edit {
    background-color: #ffc107;
    color: #212529;
}

.btn-edit:hover {
    background-color: #e0a800;
    color: #212529;
}

.btn-delete {
    background-color: #dc3545;
    color: white;
}

.btn-delete:hover {
    background-color: #c82333;
    color: white;
}

.btn-add {
    background-color: #28a745;
    color: white;
}

.btn-add:hover {
    background-color: #218838;
    color: white;
}

/* ========================================
   FORMS
   ======================================== */
.form-control {
    border-radius: 0.375rem;
    border: 1px solid #ced4da;
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-control:focus {
    border-color: #0d6efd;
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

.form-label {
    font-weight: 500;
    color: #495057;
    margin-bottom: 0.5rem;
}

.form-check-input:checked {
    background-color: #0d6efd;
    border-color: #0d6efd;
}

/* ========================================
   TABLES
   ======================================== */
.table {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 0;
}

.table thead th {
    background: #f8f9fa;
    border-bottom: 2px solid #dee2e6;
    font-weight: 600;
    color: #495057;
    padding: 12px 8px;
}

.table tbody td {
    border-color: rgba(0,0,0,0.1);
    padding: 12px 8px;
    vertical-align: middle;
}

.table-hover tbody tr:hover {
    background-color: rgba(0,0,0,0.02) !important;
}

/* ========================================
   ALERTS
   ======================================== */
.alert {
    border: none;
    border-radius: 0.5rem;
    padding: 1rem 1.25rem;
}

.alert-success {
    background-color: #d1e7dd;
    color: #0f5132;
}

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

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

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

/* ========================================
   BADGES
   ======================================== */
.badge {
    font-weight: 500;
    padding: 0.5em 0.75em;
}

/* ========================================
   UTILITIES
   ======================================== */
.text-muted {
    color: #6c757d !important;
}

.shadow-sm {
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075) !important;
}

.shadow {
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15) !important;
}

/* ========================================
   RESPONSIVE UTILITIES
   ======================================== */
@media (max-width: 768px) {
    .btn-group {
        flex-direction: column;
    }
    
    .btn-group .btn {
        margin-bottom: 0.25rem;
    }
    
    .table-responsive {
        font-size: 0.875rem;
    }
}

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

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

/* ========================================
   PRINT STYLES
   ======================================== */
@media print {
    .btn, .navbar, .debug-panel {
        display: none !important;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #000;
    }
    
    .table {
        box-shadow: none;
        border: 1px solid #000;
    }
}