:root {
    --primary-color: #2563eb;
    --secondary-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;
    --dark-color: #1f2937;
    --light-color: #f3f4f6;
    --border-radius: 8px;
    --box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

* {
    font-family: 'Cairo', 'Tajawal', sans-serif;
}

body {
    background-color: #f8f9fa;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navbar */
.navbar {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
}

/* Auth Container */
.auth-container {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.auth-container .card {
    border-radius: var(--border-radius);
    overflow: hidden;
}

/* Cards */
.card {
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Statistics Cards */
.stat-card {
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
}

.stat-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Gradient Background */
.bg-gradient-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, #1e40af 100%);
}

/* Lesson Cards */
.lesson-card {
    transition: var(--transition);
    border-radius: var(--border-radius);
}

.lesson-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.lesson-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Stage Cards */
.stage-card {
    transition: var(--transition);
    cursor: pointer;
}

.stage-card:hover {
    transform: scale(1.02);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.stage-icon i {
    transition: var(--transition);
}

.stage-card:hover .stage-icon i {
    transform: scale(1.1);
}

/* Subject Cards */
.subject-card {
    transition: var(--transition);
}

.subject-card:hover {
    background-color: var(--light-color);
}

.subject-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Grade Cards */
.grade-card {
    transition: var(--transition);
}

.grade-card:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Quiz Cards */
.question-card {
    background-color: #fff;
    transition: var(--transition);
}

.question-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

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

/* Comment Section */
.comment-item {
    transition: var(--transition);
}

.comment-item:hover {
    background-color: var(--light-color);
}

.comment-avatar {
    font-weight: bold;
    font-size: 18px;
}

/* Progress Bars */
.progress {
    border-radius: 10px;
    overflow: hidden;
}

.progress-bar {
    transition: width 0.5s ease;
}

/* Buttons */
.btn {
    border-radius: var(--border-radius);
    font-weight: 600;
    transition: var(--transition);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

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

.btn-primary:hover {
    background-color: #1d4ed8;
    border-color: #1d4ed8;
}

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

.btn-danger:hover {
    background-color: #dc2626;
}

/* Badges */
.badge {
    padding: 0.5em 0.75em;
    font-weight: 600;
    border-radius: 6px;
}

/* Alerts */
.alert {
    border-radius: var(--border-radius);
    border: none;
}

/* Lists */
.list-group-item {
    border: none;
    transition: var(--transition);
}

.list-group-item:hover {
    background-color: var(--light-color);
}

/* Forms */
.form-control,
.form-select {
    border-radius: var(--border-radius);
    border: 1px solid #d1d5db;
    padding: 0.75rem 1rem;
    transition: var(--transition);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(37, 99, 235, 0.25);
}

/* Modal */
.modal-content {
    border-radius: var(--border-radius);
    border: none;
}

.modal-header {
    border-bottom: 1px solid #e5e7eb;
}

/* Footer */
footer {
    margin-top: auto;
}

footer a:hover {
    color: var(--primary-color) !important;
    text-decoration: underline !important;
}

/* Breadcrumb */
.breadcrumb {
    background-color: white;
    padding: 1rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.breadcrumb-item.active {
    color: var(--primary-color);
}

/* Hover Shadow Utility */
.hover-shadow {
    transition: var(--transition);
}

.hover-shadow:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Responsive */
@media (max-width: 768px) {
    .navbar-brand {
        font-size: 1.25rem;
    }

    .stat-card {
        margin-bottom: 1rem;
    }

    .stage-card,
    .subject-card {
        margin-bottom: 1rem;
    }
}

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

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

/* Loading Spinner */
.spinner-border {
    width: 3rem;
    height: 3rem;
}

/* PDF Viewer */
#pdfViewer iframe {
    border-radius: var(--border-radius);
}

/* Timer Display */
.timer-display {
    font-size: 1.25rem;
}

/* Result Display */
.score-circle {
    animation: fadeIn 1s ease-in-out;
}

/* Answer Review */
.answer-review {
    transition: var(--transition);
}

.answer-review:hover {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* Profile Avatar */
.profile-avatar img {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Achievement Items */
.achievement-item {
    padding: 0.5rem;
    border-left: 3px solid var(--primary-color);
    margin-bottom: 0.5rem;
    background-color: var(--light-color);
    border-radius: 4px;
}