/* ============================================
   Online Assessment - Custom Styles
   ============================================ */

:root {
    --primary-color: #4a90e2;
    --secondary-color: #7b68ee;
    --success-color: #50c878;
    --warning-color: #ffc107;
    --danger-color: #ff4757;
    --light-bg: #f5f7fa;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light-bg);
    color: #333;
}

/* ============================================
   Navbar
   ============================================ */
.navbar {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    padding: 1rem 0;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    letter-spacing: 0.5px;
}

/* ============================================
   Cards
   ============================================ */
.card {
    border: none;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    border-radius: 10px;
    transition: all 0.3s ease;
    margin-bottom: 1.5rem;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

.card-header {
    border-bottom: 1px solid #e9ecef;
}

.card-title {
    margin-bottom: 0;
}

/* ============================================
   Forms
   ============================================ */
.form-control,
.form-select,
.input-group > .form-control {
    border-radius: 8px;
    border: 2px solid #e0e0e0;
    padding: 0.75rem 1rem;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.form-control:focus,
.form-select:focus,
.input-group > .form-control:focus {
    border-color: var(--primary-color) !important;
    box-shadow: 0 0 0 0.2rem rgba(74, 144, 226, 0.25) !important;
    background-color: #ffffff;
}

.form-control::placeholder {
    color: #aaa;
    font-style: italic;
}

.form-check-input {
    width: 1.25em;
    height: 1.25em;
    margin-right: 0.5rem;
    cursor: pointer;
    border: 2px solid #ddd;
}

.form-check-input:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.form-check-label {
    cursor: pointer;
    font-size: 1rem;
    margin-bottom: 0;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    border-radius: 8px;
    font-weight: 600;
    padding: 0.75rem 1.5rem;
    transition: all 0.3s ease;
    border: none;
}

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

.btn-primary:hover {
    background-color: #3d7bc8;
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: #6c757d;
    color: white;
}

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

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

.btn-warning {
    background-color: var(--warning-color);
    color: #000;
}

.btn-outline-primary:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn-sm {
    padding: 0.5rem 0.75rem;
    font-size: 0.9rem;
}

/* ============================================
   Tables
   ============================================ */
.table {
    margin-bottom: 0;
}

.table thead th {
    border-bottom: 2px solid #dee2e6;
    font-weight: 600;
    background-color: #f8f9fa;
    padding: 1rem;
}

.table tbody tr {
    transition: background-color 0.2s ease;
}

.table tbody tr:hover {
    background-color: rgba(74, 144, 226, 0.05);
}

.table tbody td {
    padding: 1rem;
    vertical-align: middle;
    border-bottom: 1px solid #dee2e6;
}

/* ============================================
   Badges
   ============================================ */
.badge {
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    font-weight: 500;
    letter-spacing: 0.5px;
}

.badge-lg {
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
}

/* ============================================
   Alerts
   ============================================ */
.alert {
    border-radius: 8px;
    border: none;
    padding: 1rem 1.5rem;
    margin-bottom: 1.5rem;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border-left: 4px solid var(--success-color);
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
    border-left: 4px solid var(--danger-color);
}

.alert-warning {
    background-color: #fff3cd;
    color: #856404;
    border-left: 4px solid var(--warning-color);
}

.alert-info {
    background-color: #d1ecf1;
    color: #0c5460;
    border-left: 4px solid #17a2b8;
}

.alert-dismissible {
    padding-right: 3rem;
}

/* ============================================
   Text & Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    color: #222;
    margin-bottom: 1rem;
}

.text-muted {
    color: #6c757d !important;
}

.text-danger {
    color: var(--danger-color) !important;
}

.text-success {
    color: var(--success-color) !important;
}

.fw-bold {
    font-weight: 700 !important;
    letter-spacing: 0.5px;
}

/* ============================================
   Layout
   ============================================ */
main {
    min-height: calc(100vh - 200px);
}

footer {
    background-color: #f8f9fa;
    border-top: 1px solid #e0e0e0;
    padding: 2rem 0;
    margin-top: 3rem;
    text-align: center;
    color: #666;
}

.container-fluid {
    max-width: 100%;
}

/* ============================================
   Utility Classes
   ============================================ */
.shadow-lg {
    box-shadow: 0 4px 16px rgba(0,0,0,0.15) !important;
}

.rounded-lg {
    border-radius: 10px;
}

.border-left {
    border-left: 4px solid var(--primary-color);
}

.opacity-75 {
    opacity: 0.75;
}

.opacity-50 {
    opacity: 0.5;
}

/* ============================================
   Exam Interface
   ============================================ */
.question-link {
    text-align: left;
    padding: 0.75rem;
    border: none;
    border-left: 3px solid transparent;
    transition: all 0.3s ease;
}

.question-link:hover {
    background-color: rgba(74, 144, 226, 0.1);
    border-left-color: var(--primary-color);
}

.question-link.active {
    background-color: rgba(74, 144, 226, 0.2);
    border-left-color: var(--primary-color);
    color: var(--primary-color);
    font-weight: 600;
}

.question-text {
    font-size: 1.05rem;
    line-height: 1.6;
    color: #222;
}

.options-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-check {
    padding: 1rem;
    background-color: #f8f9fa;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.form-check:hover {
    background-color: #e9ecef;
}

/* ============================================
   Timer
   ============================================ */
#timerBox {
    background-color: var(--success-color) !important;
    color: white !important;
    padding: 1rem !important;
    text-align: center;
    border-radius: 8px;
    min-width: 120px;
}

#timerBox.bg-danger {
    background-color: var(--danger-color) !important;
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.8; }
}

/* ============================================
   Modal Customization
   ============================================ */
.modal-header {
    background-color: var(--primary-color);
    color: white;
}

.modal-title {
    font-weight: 700;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    .card {
        margin-bottom: 1rem;
    }
    
    .table {
        font-size: 0.9rem;
    }
    
    .btn {
        padding: 0.65rem 1rem;
    }
    
    .alert {
        padding: 0.75rem 1rem;
    }
    
    h1 {
        font-size: 1.75rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
}

@media (max-width: 576px) {
    .container-fluid {
        padding: 0.5rem;
    }
    
    main {
        padding: 1rem 0.5rem !important;
    }
    
    .card {
        margin-bottom: 0.75rem;
    }
    
    .table {
        font-size: 0.85rem;
    }
    
    th, td {
        padding: 0.5rem !important;
    }
}

/* ============================================
   Loading Animation
   ============================================ */
.spinner-border {
    color: var(--primary-color);
}

/* ============================================
   Accordion Customization
   ============================================ */
.accordion-button {
    color: #222;
    font-weight: 600;
}

.accordion-button:not(.collapsed) {
    background-color: rgba(74, 144, 226, 0.1);
    color: var(--primary-color);
}

.accordion-item {
    border: 1px solid #dee2e6;
    margin-bottom: 0.5rem;
    border-radius: 6px;
}