/* ===== CONTENT LAYOUT - Listening Page Styles ===== */

/* Main Content Layout */
.content-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 30px;
    margin-top: calc(var(--header-sticky-height) + 20px);
    padding: 20px 0;
}

/* Main Article Section */
.main-article {
    background: var(--content-background);
    border-radius: var(--border-radius);
    padding: 40px;
    box-shadow: var(--box-shadow);
}

/* Lesson Header */
.lesson-header {
    margin-bottom: 30px;
    padding-bottom: 25px;
}

.lesson-meta {
    display: flex;
    gap: 15px;
    align-items: center;
    margin-bottom: 15px;
}

.category {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    padding: 6px 15px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
}

.level-badge {
    background: var(--background-light);
    color: var(--text-light);
    padding: 6px 15px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
}

.lesson-title {
    font-size: 2.2rem;
    color: var(--text-color);
    margin: 15px 0;
    font-weight: 700;
    line-height: 1.3;
}

.lesson-description p {
    color: var(--text-light);
    font-size: 1.05rem;
    line-height: 1.6;
    margin: 0;
}

/* Table of Contents */
.table-of-contents {
    background: var(--background-light);
    border-radius: var(--border-radius);
    margin-bottom: 30px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.toc-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 25px;
    cursor: pointer;
    background: var(--accent-bg);
    transition: var(--transition);
}

.toc-header:hover {
    background: var(--background-light);
}

.toc-header h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 0;
    font-size: 1.1rem;
    color: var(--text-color);
}

.toggle-btn {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    padding: 5px;
    transition: var(--transition);
}

.toggle-btn i {
    font-size: 1.2rem;
    transition: transform 0.3s ease;
}

.toc-header.active .toggle-btn i {
    transform: rotate(180deg);
}

.toc-content {
    padding: 20px 25px;
    display: none;
}

.toc-content.active {
    display: block;
}

.toc-content ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.toc-content li {
    margin: 10px 0;
}

.toc-content a {
    color: var(--text-color);
    text-decoration: none;
    display: block;
    padding: 8px 15px;
    border-left: 3px solid transparent;
    transition: var(--transition);
    border-radius: 4px;
}

.toc-content a:hover {
    color: var(--primary-color);
    background: var(--accent-bg);
    border-left-color: var(--primary-color);
    transform: translateX(5px);
}

/* Content Sections */
.content-section {
    margin-bottom: 30px;
    background: var(--background-light);
    border-radius: var(--border-radius);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 25px;
    cursor: pointer;
    background: var(--accent-bg);
    transition: var(--transition);
}

.section-header:hover {
    background: var(--background-light);
}

.section-header h2 {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 0;
    font-size: 1.3rem;
    color: var(--text-color);
}

.section-content {
    padding: 25px;
    display: none;
}

.section-content.active {
    display: block;
}

/* English and Vietnamese Text */
.english-text,
.vietnamese-text {
    line-height: 1.8;
}

.english-text p,
.vietnamese-text p {
    margin-bottom: 20px;
    color: var(--text-color);
    font-size: 1.05rem;
}

.english-text p:last-child,
.vietnamese-text p:last-child {
    margin-bottom: 0;
}

/* Audio Section */
.audio-section {
    margin-bottom: 30px;
}

.audio-player {
    background: var(--background-light);
    padding: 25px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}

.audio-player h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    color: var(--text-color);
    font-size: 1.2rem;
}

.audio-controls audio {
    width: 100%;
    margin-bottom: 15px;
    border-radius: 25px;
}

.audio-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-light);
    font-size: 0.95rem;
}

.speed-control select {
    padding: 5px 10px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    background: var(--content-background);
    color: var(--text-color);
    cursor: pointer;
}

/* Quiz Section */
.quiz-section {
    margin-bottom: 30px;
}

.quiz-section h2 {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    color: var(--text-color);
    font-size: 1.5rem;
}

.quiz-instruction {
    color: var(--text-light);
    margin-bottom: 25px;
    font-size: 1rem;
}

.quiz-container {
    margin-bottom: 25px;
}

.quiz-question {
    background: var(--background-light);
    padding: 25px;
    margin-bottom: 25px;
    border-radius: var(--border-radius);
    border: 2px solid var(--border-color);
    transition: var(--transition);
}

.quiz-question:hover {
    border-color: var(--primary-color);
    box-shadow: var(--box-shadow);
}

.quiz-question.answered {
    border-color: var(--primary-color);
    background: var(--accent-bg);
}

.question-header {
    margin-bottom: 20px;
}

.question-number {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    padding: 8px 16px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 15px;
}

.question-text {
    margin-left: 0;
}

.question-text .english {
    font-weight: 600;
    margin-bottom: 0;
    color: var(--text-color);
    font-size: 1.1rem;
    line-height: 1.4;
}

.question-options {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.option-label {
    display: flex;
    align-items: center;
    padding: 15px 20px;
    background: var(--content-background);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.option-label:hover {
    border-color: var(--primary-color);
    background: var(--accent-bg);
    transform: translateX(5px);
}

.option-label input[type="radio"] {
    margin-right: 15px;
    cursor: pointer;
    transform: scale(1.2);
}

.option-text {
    cursor: pointer;
    flex: 1;
    color: var(--text-color);
    font-weight: 500;
    font-size: 1rem;
    line-height: 1.3;
}

/* Quiz States */
.option-label.selected {
    border-color: var(--primary-color);
    background: var(--accent-bg);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.1);
}

.option-label.correct {
    border-color: #22c55e;
    background: linear-gradient(135deg, #dcfce7, #bbf7d0);
    color: #166534;
}

.option-label.correct .option-text {
    color: #166534;
    font-weight: 600;
}

.option-label.correct::after {
    content: '✓';
    position: absolute;
    right: 15px;
    color: #22c55e;
    font-weight: bold;
    font-size: 1.2rem;
}

.option-label.incorrect {
    border-color: #ef4444;
    background: linear-gradient(135deg, #fee2e2, #fecaca);
    color: #991b1b;
}

.option-label.incorrect .option-text {
    color: #991b1b;
    font-weight: 600;
}

.option-label.incorrect::after {
    content: '✗';
    position: absolute;
    right: 15px;
    color: #ef4444;
    font-weight: bold;
    font-size: 1.2rem;
}

/* Disabled state after submission */
.quiz-question.submitted .option-label input[type="radio"] {
    pointer-events: none;
}

.quiz-question.submitted .option-label {
    cursor: default;
}

.quiz-question.submitted .option-label:hover {
    transform: none;
}

/* Quiz Controls */
.quiz-controls {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
}

.btn {
    padding: 12px 30px;
    border: none;
    border-radius: 25px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    box-shadow: var(--box-shadow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-lg);
}

.btn-secondary {
    background: var(--background-light);
    color: var(--text-color);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--accent-bg);
    border-color: var(--primary-color);
}

/* Quiz Result */
.quiz-result {
    background: var(--background-light);
    padding: 30px;
    border-radius: var(--border-radius);
    border: 2px solid var(--primary-color);
    text-align: center;
}

.result-score h3 {
    margin-bottom: 15px;
    color: var(--text-color);
    font-size: 1.3rem;
}

.score-display {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.score-display .score {
    color: var(--primary-color);
}

.score-display .total {
    color: var(--text-light);
    font-size: 2rem;
}

.result-feedback {
    color: var(--text-light);
    font-size: 1.1rem;
    line-height: 1.6;
}

/* Related Articles */
.related-articles {
    margin-top: 80px;
    border: 2px solid var(--border-color);
    border-radius: 30px;
    padding: 30px 25px 25px;
    position: relative;
}

.related-articles h2 {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    color: var(--text-color);
    font-size: 1.3rem;
    position: absolute;
    top: -18px;
    left: 20px;
    background: var(--content-background);
    padding: 0 15px;
}

.articles-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.article-item {
    background: var(--background-light);
    padding: 15px 18px;
    border-radius: var(--border-radius);
    border-left: 3px solid transparent;
    transition: var(--transition);
}

.article-item:hover {
    border-left-color: var(--primary-color);
    background: var(--accent-bg);
    transform: translateX(5px);
}

.article-item h3 {
    margin-bottom: 6px;
    font-size: 1rem;
    font-weight: 600;
}

.article-item a {
    color: var(--text-color);
    text-decoration: none;
    transition: var(--transition);
}

.article-item a:hover {
    color: var(--primary-color);
}

.article-item p {
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.5;
    margin: 0;
}

/* Sidebar */
.sidebar {
    position: sticky;
    top: calc(var(--header-sticky-height) + 20px);
    align-self: start;
}

.widget {
    background: var(--content-background);
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 25px;
}

.widget-title {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: var(--text-color);
    font-weight: 600;
}

.test-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.test-item {
    display: block;
    padding: 18px;
    background: var(--background-light);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    text-decoration: none;
    transition: var(--transition);
}

.test-item:hover {
    transform: translateX(5px);
    box-shadow: var(--box-shadow);
    border-color: var(--primary-color);
}

.test-item h4 {
    color: var(--text-color);
    margin-bottom: 8px;
    font-size: 1.05rem;
}

.test-item p {
    color: var(--text-light);
    margin-bottom: 10px;
    font-size: 0.9rem;
}

.difficulty {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 0.85rem;
    font-weight: 600;
}

.difficulty.easy {
    background: #d4edda;
    color: #155724;
}

.difficulty.medium {
    background: #fff3cd;
    color: #856404;
}

.difficulty.hard {
    background: #f8d7da;
    color: #721c24;
}

/* Dark Theme Support */
body.dark-theme .difficulty.easy {
    background: #1e4620;
    color: #d4edda;
}

body.dark-theme .difficulty.medium {
    background: #4a3c1a;
    color: #fff3cd;
}

body.dark-theme .difficulty.hard {
    background: #4a1e21;
    color: #f8d7da;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .content-layout {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        position: static;
    }
}

@media (max-width: 768px) {
    .main-article {
        padding: 25px 20px;
    }
    
    .lesson-title {
        font-size: 1.8rem;
    }
    
    .lesson-meta {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .quiz-controls {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}