/* static/css/lessons.css */

/* Lessons Index Page */
.lesson-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
    margin-bottom: 30px;
}

.lesson-card {
    background-color: var(--card-bg-color, #ffffff);
    border: 1px solid var(--border-color, #e0e0e0);
    border-radius: var(--border-radius-large, 12px); /* Slightly larger radius */
    padding: 20px;
    box-shadow: var(--shadow-light, 0 2px 4px rgba(0,0,0,0.1));
    transition: box-shadow 0.3s ease, transform 0.3s ease;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.lesson-card:hover {
    box-shadow: var(--shadow-medium, 0 5px 15px rgba(0,0,0,0.2)); /* Enhanced hover shadow */
    transform: translateY(-5px); /* Enhanced hover transform */
}

.lesson-card .lesson-header {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
    gap: 10px; /* Gap between badge and title */
}

.level-badge {
    padding: 5px 12px;
    border-radius: var(--border-radius-pill, 20px); /* Pill shape */
    font-size: 0.75rem;
    font-weight: 700; /* Bolder */
    color: #fff;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    flex-shrink: 0; /* Prevent badge from shrinking */
}

.level-badge.beginner {
    background-color: var(--success-color, #28a745);
}

.level-badge.intermediate {
    background-color: var(--warning-color, #ffc107);
    color: var(--dark-gray, #212529); /* Ensure contrast */
}

.level-badge.advanced {
    background-color: var(--danger-color, #dc3545);
}

.lesson-card .lesson-title { /* Updated selector */
    font-size: 1.4rem; /* Adjusted size */
    font-weight: 600; /* Semibold */
    color: var(--heading-color, var(--primary-dark, #0056b3)); /* Use heading color or primary dark */
    margin: 0;
    line-height: 1.3;
    flex-grow: 1;
}

.lesson-card .lesson-description {
    font-size: 0.95rem;
    color: var(--text-color-secondary, #555);
    margin-bottom: 15px;
    flex-grow: 1;
    line-height: 1.6;
}

.lesson-card .lesson-meta {
    font-size: 0.85rem;
    color: var(--text-color-muted, #777);
    margin-bottom: 15px;
}

.lesson-card .lesson-actions {
    margin-top: auto;
}

.lesson-card .lesson-actions .btn {
    width: 100%;
    text-align: center;
    padding: 10px 15px; /* Consistent button padding */
}

.lesson-card .lesson-actions .btn i {
    margin-right: 8px;
}

/* Lesson Detail Page */
.lesson-detail-page-container {
     /* Add any specific padding or margins for the lesson detail page */
}

.lesson-article-container { /* Updated selector, was .lesson-container */
    background-color: var(--card-bg-color, #ffffff);
    padding: 30px 35px; /* Increased padding */
    border-radius: var(--border-radius-large, 12px); /* Consistent with cards */
    box-shadow: var(--shadow-diffuse, 0 3px 10px rgba(0,0,0,0.0.16)); /* Slightly more diffuse shadow */
    margin-bottom: 30px;
}

.lesson-article-header h1 { /* Updated selector, was .lesson-header h1 */
    color: var(--primary-dark, #0056b3);
    font-size: 2.2rem; /* Slightly larger */
    margin-top: 0; /* Ensure no extra top margin */
    margin-bottom: 25px;
    border-bottom: 2px solid var(--primary-light, #cfe2ff);
    padding-bottom: 15px;
}

.lesson-content {
    line-height: 1.75; /* Increased line height for readability */
    color: var(--text-color, #333);
    font-size: 1.05rem; /* Base font size for content */
}

.lesson-content h2 {
    font-size: 1.9rem; /* Adjusted heading sizes */
    color: var(--secondary-color, #545b62); /* Slightly muted secondary */
    margin-top: 35px;
    margin-bottom: 15px;
    border-bottom: 1px solid var(--border-color-light, #eee);
    padding-bottom: 8px;
}

.lesson-content h3 {
    font-size: 1.6rem; /* Adjusted heading sizes */
    color: var(--secondary-dark, #495057); /* Slightly muted secondary */
    margin-top: 30px;
    margin-bottom: 12px;
}

.lesson-content p {
    margin-bottom: 1.2em; /* Relative margin */
}

.lesson-content ul,
.lesson-content ol {
    margin-bottom: 1.2em;
    padding-left: 30px; /* Increased padding */
}

.lesson-content li {
    margin-bottom: 0.6em;
}

.lesson-content pre {
    background-color: var(--code-bg-color, #f8f9fa); /* Use a variable */
    border: 1px solid var(--border-color, #e0e0e0);
    border-radius: var(--border-radius-medium, 8px); /* Consistent radius */
    padding: 20px; /* Increased padding */
    overflow-x: auto;
    font-family: var(--font-mono, monospace);
    font-size: 0.95rem; /* Slightly larger code font */
    line-height: 1.6;
}

.lesson-content code:not(pre code) { /* Inline code */
    background-color: var(--inline-code-bg-color, rgba(27,31,35,.05)); /* Subtle background */
    padding: .2em .4em;
    margin: 0;
    font-size: 85%;
    border-radius: var(--border-radius-small, 4px);
    font-family: var(--font-mono, monospace);
}

.lesson-content blockquote {
    border-left: 5px solid var(--primary-color, #007bff); /* Thicker border */
    padding: 15px 20px; /* More padding */
    margin: 25px 0;
    font-style: italic;
    color: var(--text-color-secondary, #555);
    background-color: var(--blockquote-bg-color, #f9f9f9); /* Subtle background */
    border-radius: 0 var(--border-radius-medium, 8px) var(--border-radius-medium, 8px) 0;
}

.lesson-navigation {
    margin-top: 40px;
    padding-top: 25px;
    border-top: 1px solid var(--border-color, #e0e0e0);
    display: flex;
    justify-content: flex-start; /* Align button to the left */
    align-items: center;
}

.lesson-navigation .btn {
    min-width: 150px; /* Ensure enough width */
    padding: 10px 20px; /* Consistent button padding */
}

.lesson-navigation .btn i {
    margin-right: 8px;
}

/* Lessons Index Page Specific Container (if needed beyond .medium-container) */
.lessons-page-container {
    /* Add any specific padding or margins for the lessons index page */
}

/* Filters Section */
.filters {
    margin-bottom: 30px;
    padding: 20px;
    background-color: var(--surface-color, #f9f9f9);
    border-radius: var(--border-radius-medium, 8px);
    box-shadow: var(--shadow-light, 0 2px 4px rgba(0,0,0,0.1));
}

.filters h3 {
    margin-top: 0;
    margin-bottom: 15px;
    font-size: 1.25rem;
    color: var(--text-color-secondary, #555);
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.filter-btn {
    padding: 8px 18px;
    border: 1px solid var(--border-color, #ddd);
    background-color: var(--button-bg-color, #fff);
    color: var(--button-text-color, #333);
    border-radius: var(--border-radius-medium, 6px); /* Consistent with other buttons */
    cursor: pointer;
    transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
    font-size: 0.9rem;
    font-weight: 500;
}

.filter-btn:hover {
    background-color: var(--primary-light-hover, #e9ecef); /* Lighter primary or accent */
    border-color: var(--primary-color-darker, #0056b3); /* Darker primary on hover */
    box-shadow: var(--shadow-small, 0 1px 3px rgba(0,0,0,0.15));
}

.filter-btn.active {
    background-color: var(--primary-color, #007bff);
    color: var(--button-text-color-primary, #fff);
    border-color: var(--primary-color, #007bff);
    font-weight: 600;
    box-shadow: var(--shadow-medium, 0 4px 8px rgba(0,0,0,0.1));
}

/* Lessons Grid and Cards */
.lessons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px; /* Increased gap slightly */
    margin-top: 20px;
    margin-bottom: 30px;
}