/* css/quiz-engine.css */

/* Quiz Container (Modal) */
.quiz-container.embedded {
    display: none;
    position: fixed;
    top: 0;
    left: 0; /* Default position */
    right: 0;
    bottom: 0;
    background: var(--bg-body);
    z-index: 1000;
    padding: 0;
    overflow: hidden;
    /* NEW: Add transition for smooth shifting */
    transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1),
                right 0.3s cubic-bezier(0.4, 0, 0.2, 1),
                width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* MODIFIED: When HTML has sidebar-active class, shift the quiz container */
html.sidebar-active .quiz-container.embedded {
    /* right: var(--sidebar-width-desktop);  <-- 这个变量现在由JS动态更新 */
    /* width: calc(100% - var(--sidebar-width-desktop)); <-- 这个变量现在由JS动态更新 */
    /* JS 将直接修改 quizContainer.style.right 和 quizContainer.style.width */
}

.quiz-wrapper {
    display: flex;
    flex-direction: column;
    width: 100%;
    height: 100vh;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(15px);
    position: relative;
    box-sizing: border-box;
}

/* Quiz Header */
.quiz-header {
    text-align: center;
    padding: 15px 20px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.05) 100%);
    border-bottom: 1px solid var(--border-color-light);
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
    max-height: 20vh;
    min-height: 80px;
    box-sizing: border-box;
}

.quiz-header h1 {
    color: var(--text-primary);
    font-size: clamp(1.4em, 3.5vw, 1.8em);
    font-weight: 700;
    margin-bottom: 6px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    max-height: 2.6em;
}

.quiz-header p {
    color: var(--text-secondary);
    font-size: clamp(0.8em, 2vw, 0.95em);
    font-weight: 400;
    margin: 0;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    max-height: 2.8em;
}

/* Progress Bar */
.progress-bar-container {
    width: calc(100% - 40px);
    margin: 12px auto;
    background: #f7fafc;
    border-radius: 50px;
    height: 18px;
    overflow: hidden;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
    position: relative;
    flex-shrink: 0;
}

.progress-bar {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    text-align: center;
    line-height: 18px;
    color: white;
    transition: width 0.6s cubic-bezier(0.25, 0.8, 0.25, 1);
    font-size: 0.75em;
    font-weight: 600;
    position: relative;
    box-shadow: 0 1px 8px rgba(102, 126, 234, 0.25);
}

/* Quiz Close Button */
.quiz-close-btn {
    position: absolute;
    top: 10px;
    right: 15px;
    background: rgba(255, 255, 255, 0.2);
    color: var(--text-primary);
    border: none;
    border-radius: 50%;
    width: 35px;
    height: 35px;
    cursor: pointer;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    z-index: 1;
}

.quiz-close-btn:hover {
    background: rgba(255, 255, 255, 0.4);
}

/* Quiz Content Area */
.quiz-content-area {
    flex-grow: 1;
    overflow-y: auto;
    padding: 0 20px 20px 20px;
    scrollbar-width: thin;
    scrollbar-color: var(--primary-color) #f7fafc;
    min-height: 60vh;
    box-sizing: border-box;
}

/* Styles for individual question blocks */
.question-block {
    background: var(--bg-card);
    padding: 20px 25px;
    border-radius: var(--border-radius-md);
    margin: 20px auto;
    max-width: 800px;
    box-shadow: var(--shadow-card);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    animation: fadeInQuestion 0.5s cubic-bezier(0.25, 0.8, 0.25, 1) forwards;
    opacity: 0;
    box-sizing: border-box;
}

@keyframes fadeInQuestion {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

.question-block::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background: linear-gradient(180deg, var(--primary-color) 0%, var(--accent-color) 100%);
    border-top-left-radius: var(--border-radius-md);
    border-bottom-left-radius: var(--border-radius-md);
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 18px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color-light);
}

.section-title-display {
    font-size: 0.85em;
    color: var(--text-muted);
    font-weight: 500;
    background: #f7fafc;
    padding: 5px 12px;
    border-radius: 20px;
    border: 1px solid var(--border-color-light);
}

.question-number-display {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 0.9em;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(240, 147, 251, 0.1));
    padding: 6px 15px;
    border-radius: 20px;
    border: 1px solid rgba(102, 126, 234, 0.3);
}

.question-text {
    font-weight: 500;
    margin-bottom: 20px;
    font-size: 1.2em;
    color: var(--text-primary);
    line-height: 1.6;
}

.options {
    display: grid;
    gap: 12px;
}

/* Hide default radio/checkbox */
.options input[type="radio"],
.options input[type="checkbox"] {
    opacity: 0;
    position: absolute;
    width: 1px;
    height: 1px;
}

.options label {
    display: flex;
    align-items: center;
    padding: 14px 18px;
    border-radius: 6px;
    background: #f7fafc;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    color: var(--text-secondary);
    font-weight: 500;
    position: relative;
    overflow: hidden;
    box-sizing: border-box;
}

/* Custom Radio Styles */
.options label .custom-radio {
    width: 18px;
    height: 18px;
    border: 2px solid var(--border-color-light);
    border-radius: 50%;
    margin-right: 12px;
    display: inline-block;
    transition: var(--transition);
    flex-shrink: 0;
    position: relative;
}

.options label .custom-radio::after {
    content: '';
    width: 10px;
    height: 10px;
    background: var(--primary-color);
    border-radius: 50%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    transition: var(--transition);
}

.options input[type="radio"]:checked + .custom-radio {
    border-color: var(--primary-color);
}

.options input[type="radio"]:checked + .custom-radio::after {
    transform: translate(-50%, -50%) scale(1);
}

/* Custom Checkbox Styles */
.options label .custom-checkbox {
    width: 18px;
    height: 18px;
    border: 2px solid var(--border-color-light);
    border-radius: 3px;
    margin-right: 12px;
    display: inline-block;
    transition: var(--transition);
    flex-shrink: 0;
    position: relative;
    background-color: white;
}

.options label .custom-checkbox::after {
    content: '';
    width: 5px;
    height: 10px;
    border: solid var(--primary-color);
    border-width: 0 3px 3px 0;
    position: absolute;
    top: 45%;
    left: 50%;
    transform: translate(-50%, -50%) rotate(45deg) scale(0);
    transition: transform 0.2s ease-in-out;
}

.options input[type="checkbox"]:checked + .custom-checkbox {
    border-color: var(--primary-color);
    background-color: var(--primary-color);
}
.options input[type="checkbox"]:checked + .custom-checkbox::after {
    transform: translate(-50%, -50%) rotate(45deg) scale(1);
    border-color: white;
}

.options label:hover:not(.answered-option):not(.disabled-option) {
    background: rgba(102, 126, 234, 0.08);
    border-color: var(--primary-color);
    color: var(--text-primary);
    transform: translateX(3px);
    box-shadow: var(--shadow-card);
}

.options label.selected-option {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.15), rgba(240, 147, 251, 0.1));
    border-color: var(--primary-color);
    color: var(--text-primary);
    font-weight: 600;
}

.options label.answered-option {
    cursor: default;
    opacity: 0.9;
}

.options label.correct-answer-highlight {
    background: rgba(72, 187, 120, 0.1) !important;
    border-color: var(--success-color) !important;
    color: var(--text-primary) !important;
    font-weight: 600;
}

.options label.incorrect-user-choice {
    background: rgba(245, 101, 101, 0.1) !important;
    border-color: var(--error-color) !important;
    color: var(--text-primary) !important;
}

.options label.missed-correct-highlight {
    background: var(--missed-correct-bg) !important;
    border-color: var(--missed-correct-color) !important;
    color: var(--text-primary) !important;
}
.options label.missed-correct-highlight .custom-checkbox::before,
.options label.missed-correct-highlight .custom-radio::before {
    content: "❓";
    position: absolute;
    right: -20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--missed-correct-color);
    font-size: 1.2em;
    padding-right: 5px;
}

.explanation {
    margin-top: 20px;
    padding: 18px 22px;
    border-radius: 6px;
    font-size: 0.95em;
    line-height: 1.7;
    animation: fadeInExplanation 0.4s ease-out 0.2s forwards;
    opacity: 0;
    box-sizing: border-box;
}

@keyframes fadeInExplanation {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.explanation.correct {
    background: rgba(72, 187, 120, 0.1);
    border-left: 4px solid var(--success-color);
    color: var(--text-primary);
}

.explanation.incorrect {
    background: rgba(245, 101, 101, 0.1);
    border-left: 4px solid var(--error-color);
    color: var(--text-primary);
}

/* Navigation Controls */
.navigation-controls {
    padding: 18px 30px;
    border-top: 1px solid var(--border-color-light);
    background: linear-gradient(135deg, rgba(255,255,255,0.7), rgba(250,250,252,0.8));
    backdrop-filter: blur(10px);
    flex-shrink: 0;
    box-sizing: border-box;
}

.navigation-buttons {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
}

.nav-btn, .submit-btn-single {
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font-size: 0.9em;
    font-weight: 600;
    transition: var(--transition);
    min-width: 110px;
    text-align: center;
    box-shadow: var(--shadow-card);
    position: relative;
    overflow: hidden;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-family: inherit;
}

#submit-btn, #next-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
}

#prev-btn {
    background: #f7fafc;
    color: var(--text-secondary);
    border: 1px solid var(--border-color-light);
}

.nav-btn:hover:not([disabled]) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.nav-btn:disabled {
    background: #b8c2d4;
    color: #e2e8f0;
    cursor: not-allowed;
    box-shadow: none;
    transform: none;
}

/* Final Score Container */
.final-score-container {
    flex-grow: 1;
    display: none;
    flex-direction: column;
    align-items: center;
    /* MODIFIED: Changed from center to flex-start to fix top cutoff */
    justify-content: flex-start; 
    padding: 30px;
    text-align: center;
    overflow-y: auto;
    box-sizing: border-box;
}

.final-score-summary {
    font-size: 1.05em;
    color: var(--text-primary);
    margin-bottom: 25px; /* Retain margin-bottom for spacing */
    margin-top: 20px; /* Add some margin-top for better look when aligned to top */
    line-height: 1.7;
    background: var(--bg-card);
    padding: 25px 30px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-hover);
    border: 1px solid var(--border-color-light);
    max-width: 700px; /* Increased max-width for AI Duel */
    width: 100%;
    box-sizing: border-box;
}

/* AI Duel Specific Result Styles */
.final-score-summary.ai-duel-result {
    padding: 30px;
}
.final-score-summary.ai-duel-result .ai-duel-loading {
    padding: 30px;
}
.final-score-summary.ai-duel-result .ai-duel-loading h3 {
    margin-bottom: 15px;
}

.final-score-summary.ai-duel-result .ai-duel-header h3 {
    margin-bottom: 12px;
    color: var(--primary-color);
    font-size: 1.8em; /* More prominent */
    font-weight: 700;
}

.final-score-summary.ai-duel-result .duel-outcome-message {
    font-size: 1.3em; /* Larger outcome message */
    font-weight: 600;
    margin-bottom: 20px;
    padding: 10px 15px;
    border-radius: 8px;
}
.final-score-summary.ai-duel-result .duel-outcome-message.win { background-color: rgba(var(--success-rgb), 0.15); color: var(--success-color); border: 1px solid var(--success-color); }
.final-score-summary.ai-duel-result .duel-outcome-message.loss { background-color: rgba(229, 62, 62, 0.15); color: var(--error-color); border: 1px solid var(--error-color); }
.final-score-summary.ai-duel-result .duel-outcome-message.tie { background-color: rgba(0,0,0, 0.08); color: var(--text-primary); border: 1px solid #ccc; }

.final-score-summary.ai-duel-result .duel-scores-container {
    display: flex;
    justify-content: space-around;
    align-items: center;
    margin-bottom: 20px;
    gap: 15px;
    padding: 15px 0;
    border-top: 1px solid var(--border-color-light);
    border-bottom: 1px solid var(--border-color-light);
}

.final-score-summary.ai-duel-result .duel-score-card {
    padding: 15px 20px;
    border-radius: 10px;
    background-color: #f8fafc;
    flex: 1;
    min-width: 180px;
}
.final-score-summary.ai-duel-result .duel-score-card.player-score { border-left: 4px solid var(--primary-color); }
.final-score-summary.ai-duel-result .duel-score-card.ai-score { border-left: 4px solid var(--accent-color); }

.final-score-summary.ai-duel-result .duel-score-card h4 {
    font-size: 1.1em;
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
}
.final-score-summary.ai-duel-result .duel-score-card .duel-player-icon { font-size: 1.3em; }


.final-score-summary.ai-duel-result .duel-score-card .score-value {
    font-size: 2em;
    font-weight: 700;
    color: var(--text-primary);
    display: block;
    margin-bottom: 4px;
}
.final-score-summary.ai-duel-result .duel-score-card .accuracy-value {
    font-size: 0.9em;
    color: var(--text-muted);
}

.final-score-summary.ai-duel-result .duel-vs-separator {
    font-size: 1.8em;
    font-weight: bold;
    color: var(--text-muted);
    padding: 0 10px;
}

.final-score-summary.ai-duel-result .duel-meta-info {
    font-size: 0.95em;
    color: var(--text-secondary);
    margin-bottom: 25px;
}

/* Duel Comparison List */
.final-score-summary.ai-duel-result .duel-comparison-container {
    text-align: left;
    max-height: 300px; /* Adjusted max-height */
    overflow-y: auto;
    border: 1px solid var(--border-color-light);
    padding: 20px;
    margin-top: 25px;
    border-radius: 10px;
    background-color: #f9fafb;
    box-sizing: border-box;
}

.final-score-summary.ai-duel-result .duel-comparison-container h4 {
    margin-bottom: 15px;
    font-size: 1.2em;
    color: var(--text-primary);
    border-bottom: 1px solid #ddd;
    padding-bottom: 10px;
}

.final-score-summary.ai-duel-result .duel-comparison-item {
    font-size: 0.9em;
    margin-bottom: 18px;
    padding: 12px;
    border-radius: 8px;
    background-color: white;
    border: 1px solid #e8e8e8;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}
.final-score-summary.ai-duel-result .duel-comparison-item:last-child {
    margin-bottom: 0;
}

.final-score-summary.ai-duel-result .comparison-question-header {
    margin-bottom: 10px;
    font-weight: 600;
}
.final-score-summary.ai-duel-result .comparison-question-header strong {
    color: var(--text-primary);
    margin-right: 5px;
}
.final-score-summary.ai-duel-result .comparison-question-text {
    color: var(--text-secondary);
    font-weight: normal;
}

.final-score-summary.ai-duel-result .comparison-answers .answer-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 0;
    border-bottom: 1px dashed #eee;
    line-height: 1.5;
}
.final-score-summary.ai-duel-result .comparison-answers .answer-row:last-child {
    border-bottom: none;
}

.final-score-summary.ai-duel-result .answer-row .answer-label {
    font-weight: 500;
    color: var(--text-muted);
    flex-shrink: 0;
    margin-right: 10px;
    min-width: 70px;
}
.final-score-summary.ai-duel-result .answer-row .answer-text {
    flex-grow: 1;
    color: var(--text-primary);
    word-break: break-word;
}
.final-score-summary.ai-duel-result .answer-row .answer-result-icon {
    font-size: 1.1em;
    margin-left: 10px;
    flex-shrink: 0;
}

.final-score-summary.ai-duel-result .answer-row.correct .answer-text { color: var(--success-color); }
.final-score-summary.ai-duel-result .answer-row.incorrect .answer-text { color: var(--error-color); }
.final-score-summary.ai-duel-result .answer-row.correct-answer-info .answer-text { color: var(--primary-color); font-weight: 500; }


.final-score-actions {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 25px; /* Add margin-top to separate from summary */
}

/* Styles for "Edit Question" button */
.edit-question-btn-container {
    margin-top: 20px;
    text-align: right;
    padding-top: 15px;
    border-top: 1px dashed #eee;
}

.edit-question-trigger-btn {
    font-size: 0.85em !important;
    padding: 8px 16px !important;
    background-color: #f0f0f0 !important;
    color: var(--text-secondary) !important;
    border: 1px solid #ddd !important;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition);
}
.edit-question-trigger-btn:hover {
    background-color: #e0e0e0 !important;
}

.question-edit-controls {
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px dashed #eee;
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

.edit-field {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-family: inherit;
    font-size: 0.95em;
    resize: vertical;
    box-sizing: border-box;
    color: var(--text-primary);
    background-color: var(--bg-card);
}

.edit-question-text,
.edit-explanation-text {
    min-height: 80px;
}

.edit-option-item {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    padding: 5px;
    border: 1px solid transparent;
    border-radius: 6px;
    transition: var(--transition);
    box-sizing: border-box;
}
.edit-option-item:hover {
    background-color: #f9f9f9;
    border-color: #eee;
}


.edit-option-text {
    flex-grow: 1;
    margin-bottom: 0;
}

.edit-correct-answer-input {
    margin-right: 5px;
    width: auto;
    flex-shrink: 0;
    transform: scale(1.1);
}

.question-block .options label.answered-option .custom-radio,
.question-block .options label.answered-option .custom-checkbox {
    background-color: #f0f0f0;
}

.question-block .edit-field {
    display: block !important;
}
.question-block .edit-option-item {
    display: flex !important;
}

/* Custom checkbox/radio for editing */
.custom-checkbox-edit, .custom-radio-edit {
    display: inline-block;
    width: 20px; height: 20px;
    border: 2px solid var(--primary-color);
    background-color: white;
    cursor: pointer;
    flex-shrink: 0;
    position: relative;
    transition: background-color 0.2s, border-color 0.2s;
    margin-right: 5px;
}
.custom-checkbox-edit { border-radius: 4px; }
.custom-radio-edit { border-radius: 50%; }

.edit-correct-answer-input:checked + .custom-checkbox-edit {
    background-color: var(--primary-color);
}
.edit-correct-answer-input:checked + .custom-checkbox-edit::after {
    content: '';
    position: absolute;
    top: 3px; left: 6px;
    width: 6px; height: 12px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.edit-correct-answer-input:checked + .custom-radio-edit {
    background-color: var(--primary-color);
}
.edit-correct-answer-input:checked + .custom-radio-edit::after {
    content: '';
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 10px; height: 10px;
    background-color: white;
    border-radius: 50%;
}

.remove-option-btn {
    background: none;
    border: none;
    color: var(--error-color);
    font-size: 1.2rem;
    cursor: pointer;
    transition: color 0.2s;
    padding: 0 5px;
    flex-shrink: 0;
}
.remove-option-btn:hover {
    color: var(--error-color);
}

/* NEW: AI action button container for quiz/review interface */
.ai-action-btn-container {
    margin-top: 15px;
    text-align: right;
    display: flex;
    justify-content: flex-end;
}

.ai-quiz-action-btn { /* Specific styles for AI buttons in quiz/review */
    font-size: 0.85em !important;
    padding: 8px 16px !important;
    border-radius: 8px !important;
    gap: 6px !important;
}

/* AI Duel Info (displayed in quiz engine) */
.ai-duel-info {
    text-align: center;
    padding: 8px 15px;
    font-size: 0.9em;
    font-weight: 500;
    color: var(--text-muted);
    background-color: rgba(102, 126, 234, 0.06);
    border-bottom: 1px solid rgba(102, 126, 234, 0.15);
    margin-bottom: 15px;
    border-top-left-radius: 6px;
    border-top-right-radius: 6px;
}


/* Responsive Design for Quiz Engine */
@media (max-width: 768px) {
    /* On mobile, sidebar is an overlay, so quiz-container remains full screen */
    html.sidebar-active .quiz-container.embedded {
        left: 0; /* Reset to full screen */
        right: 0; /* Reset to full screen */
        width: 100%; /* Reset to full width */
    }

    .quiz-header {
        padding: 12px 15px;
        max-height: 18vh;
        min-height: 70px;
    }
    .quiz-header h1 {
        font-size: clamp(1.2em, 4vw, 1.5em);
        -webkit-line-clamp: 1;
        max-height: 1.3em;
    }
    .quiz-header p {
        font-size: clamp(0.75em, 2.5vw, 0.85em);
        -webkit-line-clamp: 1;
        max-height: 1.4em;
    }
    .progress-bar-container {
        margin: 8px auto;
        height: 16px;
    }
    .progress-bar {
        line-height: 16px;
        font-size: 0.7em;
    }
    .quiz-content-area {
        padding: 0 15px 15px 15px;
        min-height: 65vh;
    }
    .quiz-close-btn {
        top: 8px;
        right: 10px;
        width: 32px;
        height: 32px;
        font-size: 1rem;
    }

    .question-block {
        padding: 15px 20px;
        margin: 15px auto;
    }
    .question-text {
        font-size: 1.1em;
    }
    .options label {
        padding: 12px 15px;
    }
    .explanation {
        padding: 15px 18px;
    }
    .navigation-controls {
        padding: 15px 20px;
    }
    .navigation-buttons {
        flex-direction: column;
        gap: 10px;
    }
    .nav-btn, .submit-btn-single {
        width: 100%;
        min-width: unset;
        padding: 10px 15px;
        font-size: 0.85em;
    }
    .final-score-summary {
        padding: 20px 25px;
    }
    .final-score-summary.ai-duel-result .duel-comparison-container {
        padding: 15px;
        font-size: 0.85em;
    }
    .final-score-summary.ai-duel-result .duel-scores-container {
        flex-direction: column;
    }
    .final-score-summary.ai-duel-result .duel-vs-separator {
        transform: rotate(90deg);
        margin: 5px 0;
    }
}

@media (max-width: 480px) {
    .quiz-header {
        padding: 10px 12px;
        max-height: 15vh;
        min-height: 60px;
    }
    .quiz-header h1 { margin-bottom: 4px; }
    .progress-bar-container {
        margin: 6px auto;
        width: calc(100% - 24px);
    }
    .quiz-content-area {
        min-height: 70vh;
    }
    .question-block {
        padding: 12px 15px;
    }
    .question-text {
        font-size: 1em;
    }
    .options label {
        padding: 10px 12px;
        font-size: 0.9em;
    }
    .explanation {
        padding: 12px 15px;
        font-size: 0.9em;
    }
    .navigation-controls {
        padding: 12px 15px;
    }
    .nav-btn, .submit-btn-single {
        padding: 8px 12px;
        font-size: 0.8em;
    }
    .final-score-summary.ai-duel-result .duel-score-card {
        min-width: 150px;
        padding: 10px 15px;
    }
    .final-score-summary.ai-duel-result .duel-score-card .score-value {
        font-size: 1.8em;
    }
    .final-score-summary.ai-duel-result .duel-comparison-container {
        padding: 10px;
        max-height: 250px; /* Further adjust for very small screens */
    }
     .final-score-summary.ai-duel-result .comparison-answers .answer-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 3px;
    }
    .final-score-summary.ai-duel-result .answer-row .answer-result-icon {
        align-self: flex-end;
    }
}