/* Subject Page Styles */
.subject-header {
    background-color: var(--surface-color);
    padding: 3rem 0;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.subject-title {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.subject-icon {
    font-size: 2.5rem;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #f1f5f9;
    border-radius: 1rem;
}

.lesson-card {
    background: var(--surface-color);
    border-radius: 0.75rem;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: all 0.2s;
    position: relative;
    /* Ensure stacking context */
}

.lesson-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.lesson-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.lesson-number {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    display: block;
}

.lesson-title {
    font-size: 1.25rem;
    margin: 0;
}

.lesson-actions {
    padding: 1rem;
    background-color: #f8fafc;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.lesson-link {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary-color);
    position: relative;
    z-index: 2;
}

.lesson-link:hover {
    text-decoration: underline;
}

.exercise-link {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
    text-decoration: none;
    transition: color 0.2s;
    position: relative;
    z-index: 2;
    display: inline-block;
    /* Ensure it has dimensions */
    padding: 0.25rem 0.5rem;
    /* Add some hit area */
    border-radius: 4px;
}

.exercise-link:hover {
    color: var(--primary-color);
    background-color: #e0f2fe;
    /* Light blue background on hover */
}

/* Math Specific */
.math-theme .subject-icon {
    color: var(--primary-color);
    background-color: #dbeafe;
}

.math-theme .lesson-card:hover {
    border-color: var(--primary-color);
}

.math-theme .lesson-link {
    color: var(--primary-color);
}

.math-theme .exercise-link:hover {
    color: var(--primary-color);
    background-color: #dbeafe;
}

/* Physics Specific */
.physics-theme .subject-icon {
    color: var(--accent-color);
    background-color: #ffedd5;
}

.physics-theme .lesson-card:hover {
    border-color: var(--accent-color);
}

.physics-theme .lesson-link {
    color: var(--accent-color);
}

/* SVT Specific */
.svt-theme .subject-icon {
    color: var(--secondary-color);
    background-color: #dcfce7;
}

.svt-theme .lesson-card:hover {
    border-color: var(--secondary-color);
}

.svt-theme .lesson-link {
    color: var(--secondary-color);
}

@media print {

    header,
    footer,
    .hero-buttons,
    .lesson-actions,
    .btn,
    .card {
        display: none !important;
    }

    .lesson-content {
        box-shadow: none !important;
        padding: 0 !important;
        margin: 0 !important;
    }

    body {
        background: white !important;
    }

    .container {
        width: 100% !important;
        max-width: none !important;
        padding: 0 !important;
    }
}