* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --twitter-blue: #1d9bf0;
    --twitter-blue-hover: #1a8cd8;
    --border-color: #eff3f4;
    --text-primary: #0f1419;
    --text-secondary: #536471;
    --bg-primary: #ffffff;
    --bg-secondary: #f7f9f9;
    --hover-bg: #f7f9f9;
    --success-color: #00ba7c;
    --error-color: #f4212e;
    --accent-purple: #8b5cf6;
    --accent-pink: #ec4899;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: linear-gradient(to bottom, #f0f9ff 0%, #ffffff 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.app-container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--bg-primary);
    min-height: 100vh;
    box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.05);
}

/* Header */
.app-header {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
    padding: 16px 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.header-content h1 {
    font-size: 22px;
    font-weight: 800;
    color: white;
    letter-spacing: -0.5px;
}

.header-content h1 a {
    color: white;
    text-decoration: none;
    transition: opacity 0.2s;
}

.header-content h1 a:hover {
    opacity: 0.8;
}

/* Main Content */
.main-content {
    padding: 0;
}

.content-section {
    padding: 0;
    border-bottom: 1px solid var(--border-color);
}

.section-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(to bottom, #fafafa, #ffffff);
}

.section-header h2 {
    font-size: 22px;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.3px;
}

/* Input Cards */
.input-cards {
    padding: 20px;
    display: flex;
    gap: 16px;
    background: #fafafa;
    flex-wrap: wrap;
}

.input-card {
    flex: 1;
    min-width: 150px;
}

/* Buttons */
.primary-btn,
.secondary-btn,
.success-btn {
    padding: 0 20px;
    height: 40px;
    border-radius: 20px;
    font-size: 15px;
    font-weight: 700;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.primary-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.primary-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.secondary-btn {
    background: white;
    color: var(--text-primary);
    border: 1.5px solid var(--border-color);
}

.secondary-btn:hover {
    background: var(--hover-bg);
    border-color: #d1d5db;
}

.success-btn {
    background: var(--success-color);
    color: white;
    font-size: 13px;
    height: 32px;
    padding: 0 14px;
}

.success-btn:hover {
    background: #00a06b;
    transform: translateY(-1px);
}

.show-answer-btn {
    margin-top: 20px;
    padding: 10px 20px;
    background: linear-gradient(135deg, #8b5cf6 0%, #ec4899 100%);
    color: white;
    border: none;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 2px 8px rgba(139, 92, 246, 0.3);
}

.show-answer-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.4);
}

.btn-group {
    display: flex;
    gap: 12px;
    padding: 20px;
    flex-wrap: wrap;
    background: #fafafa;
}

/* Textarea */
.textarea-wrapper {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    background: white;
}

#quiz-text {
    width: 100%;
    min-height: 220px;
    padding: 16px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    resize: vertical;
    background: #fafafa;
    color: var(--text-primary);
    transition: all 0.2s;
}

#quiz-text:focus {
    outline: none;
    border-color: var(--twitter-blue);
    background: white;
    box-shadow: 0 0 0 3px rgba(29, 155, 240, 0.1);
}

/* URL Input */
.url-wrapper {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    background: white;
}

.url-input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 15px;
    background: #fafafa;
    color: var(--text-primary);
    transition: all 0.2s;
}

.url-input:focus {
    outline: none;
    border-color: var(--twitter-blue);
    background: white;
    box-shadow: 0 0 0 3px rgba(29, 155, 240, 0.1);
}

/* Saved Quizzes Section */
.saved-quizzes-section {
    border-top: 1px solid var(--border-color);
    padding: 20px;
    background: linear-gradient(to bottom, #fafafa, #ffffff);
}

.saved-quizzes-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
    letter-spacing: -0.3px;
}

.saved-quizzes-warning {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.4;
}

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

.saved-quiz-item {
    padding: 16px;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.saved-quiz-item:hover {
    border-color: var(--accent-purple);
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.15);
    transform: translateY(-2px);
}

.saved-quiz-item.empty {
    padding: 20px;
    text-align: center;
    color: var(--text-secondary);
    cursor: default;
    border-style: dashed;
    background: #fafafa;
}

.saved-quiz-item.empty:hover {
    border-color: var(--border-color);
    box-shadow: none;
    transform: none;
}

/* Quiz Action Buttons */
.quiz-action-buttons {
    border-top: 1px solid var(--border-color);
    padding: 20px;
    background: white;
}

/* Settings Section */
.settings-section {
    border-top: 1px solid var(--border-color);
    background: white;
}

.saved-quiz-info {
    flex: 1;
}

.saved-quiz-name {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.saved-quiz-meta {
    font-size: 13px;
    color: var(--text-secondary);
    display: flex;
    gap: 12px;
    align-items: center;
}

.saved-quiz-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

.delete-saved-quiz-btn {
    background: transparent;
    border: none;
    color: var(--error-color);
    font-size: 18px;
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
    opacity: 0.5;
    transition: all 0.2s;
}

.delete-saved-quiz-btn:hover {
    opacity: 1;
    background: rgba(244, 33, 46, 0.1);
    transform: scale(1.1);
}

/* Preview Card */
.preview-card {
    border-top: 1px solid var(--border-color);
    padding: 20px;
    background: white;
}

.preview-header h3 {
    font-size: 20px;
    font-weight: 800;
    margin-bottom: 16px;
    color: var(--text-primary);
    letter-spacing: -0.3px;
}

.preview-content {
    margin-bottom: 20px;
}

.preview-question {
    padding: 16px;
    margin-bottom: 12px;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-radius: 12px;
    border-left: 4px solid var(--accent-purple);
    font-size: 15px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    position: relative;
    transition: all 0.2s;
}

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

.preview-question-content {
    flex: 1;
}

.delete-question-btn {
    position: absolute;
    top: 12px;
    right: 12px;
    background: transparent;
    border: none;
    font-size: 18px;
    cursor: pointer;
    opacity: 0.5;
    transition: opacity 0.2s, background 0.2s, transform 0.2s;
    padding: 4px 8px;
    border-radius: 6px;
}

.delete-question-btn:hover {
    opacity: 1;
    background: rgba(244, 33, 46, 0.1);
    transform: scale(1.1);
}

.preview-question strong {
    color: var(--text-primary);
    font-weight: 700;
}

.preview-question p {
    color: var(--text-secondary);
    margin-top: 6px;
}

/* Settings Card */
.settings-card {
    padding: 20px;
    background: linear-gradient(135deg, #f0f4ff 0%, #faf5ff 100%);
    border-radius: 16px;
    margin-bottom: 20px;
    border: 1px solid #e9d5ff;
    box-shadow: 0 2px 8px rgba(139, 92, 246, 0.1);
}

.settings-card h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.radio-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.radio-option {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s;
    background: white;
    border: 1px solid transparent;
}

.radio-option:hover {
    background: rgba(255, 255, 255, 0.8);
    border-color: #e9d5ff;
    transform: translateX(2px);
}

.radio-option input[type="radio"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--accent-purple);
}

.radio-option span {
    font-size: 15px;
    color: var(--text-primary);
    font-weight: 500;
}

/* Toggle Option */
.toggle-option {
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid #e9d5ff;
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    padding: 12px;
    border-radius: 10px;
    transition: all 0.2s;
    background: white;
    border: 1px solid transparent;
}

.toggle-label:hover {
    background: rgba(255, 255, 255, 0.8);
    border-color: #e9d5ff;
    transform: translateX(2px);
}

.toggle-label input[type="checkbox"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: relative;
    width: 44px;
    height: 24px;
    background: #d1d5db;
    border-radius: 12px;
    transition: all 0.3s;
    flex-shrink: 0;
}

.toggle-slider::before {
    content: '';
    position: absolute;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: white;
    top: 3px;
    left: 3px;
    transition: all 0.3s;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.toggle-label input[type="checkbox"]:checked + .toggle-slider {
    background: var(--accent-purple);
}

.toggle-label input[type="checkbox"]:checked + .toggle-slider::before {
    transform: translateX(20px);
}

.toggle-text {
    font-size: 15px;
    color: var(--text-primary);
    font-weight: 500;
    flex: 1;
}

/* Error Message */
.error-message {
    margin: 20px;
    padding: 16px;
    background: linear-gradient(135deg, #fee 0%, #fdd 100%);
    color: var(--error-color);
    border-radius: 12px;
    font-size: 14px;
    white-space: pre-line;
    border: 2px solid #fcc;
    box-shadow: 0 2px 8px rgba(244, 33, 46, 0.1);
}

/* Quiz Section */
.quiz-top-bar {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(to bottom, #fafafa, #ffffff);
}

.progress-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    overflow: hidden;
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.05);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
    transition: width 0.3s ease;
    box-shadow: 0 1px 3px rgba(102, 126, 234, 0.3);
}

.question-count {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.quiz-content-card {
    padding: 24px;
    min-height: 300px;
    background: white;
}

.question-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 24px;
    line-height: 1.5;
    letter-spacing: -0.2px;
}

.question-title img {
    max-width: 100%;
    height: auto;
    border-radius: 16px;
    margin: 16px 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

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

.option-item {
    padding: 18px;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 14px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 14px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.option-item:hover {
    background: linear-gradient(135deg, #f8f9ff 0%, #faf5ff 100%);
    border-color: var(--accent-purple);
    transform: translateX(4px);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.15);
}

.option-item input[type="radio"],
.option-item input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--accent-purple);
}

.option-item.selected {
    border-color: var(--accent-purple);
    background: linear-gradient(135deg, #f0f4ff 0%, #faf5ff 100%);
    box-shadow: 0 2px 8px rgba(139, 92, 246, 0.2);
}

.option-item.correct {
    border-color: var(--success-color);
    background: linear-gradient(135deg, #d4edda 0%, #c3e6cb 100%);
    box-shadow: 0 2px 8px rgba(0, 186, 124, 0.2);
}

.option-item.incorrect {
    border-color: var(--error-color);
    background: linear-gradient(135deg, #fee 0%, #fdd 100%);
    box-shadow: 0 2px 8px rgba(244, 33, 46, 0.2);
}

/* Fill Blank - Inline */
.fill-blank-container {
    margin: 0;
    padding: 0;
}

.fill-blank-text-wrapper {
    font-size: 20px;
    line-height: 1.8;
    color: var(--text-primary);
    display: block;
}

.fill-blank-text-wrapper span {
    display: inline;
}

.fill-blank-input {
    display: inline-block;
    padding: 4px 10px;
    border: 2px solid var(--accent-purple);
    border-radius: 6px;
    font-size: 18px;
    margin: 0 4px;
    min-width: 120px;
    max-width: 200px;
    background: linear-gradient(135deg, #f8f9ff 0%, #faf5ff 100%);
    color: var(--text-primary);
    font-weight: 500;
    vertical-align: baseline;
    transition: all 0.2s;
    text-align: center;
}

.fill-blank-input:focus {
    outline: none;
    border-color: var(--twitter-blue);
    background: white;
    box-shadow: 0 0 0 3px rgba(29, 155, 240, 0.1);
    transform: scale(1.02);
}

.fill-blank-input.correct-blank {
    border-color: var(--success-color);
    background: linear-gradient(135deg, #d4edda 0%, #c3e6cb 100%);
    color: #155724;
}

.fill-blank-input.incorrect-blank {
    border-color: var(--error-color);
    background: linear-gradient(135deg, #fee 0%, #fdd 100%);
    color: #721c24;
}

.match-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 20px;
}

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

/* Right column (definitions) - darker background */
#definitions-column .match-item {
    background: linear-gradient(135deg, #f0f0f0 0%, #e8e8e8 100%);
}

#definitions-column .match-item:hover {
    background: linear-gradient(135deg, #e8e8e8 0%, #e0e0e0 100%);
}

#definitions-column .match-item.selected {
    background: linear-gradient(135deg, #e0e0e8 0%, #d8d8e0 100%);
}

#definitions-column .match-item.matched {
    background: linear-gradient(135deg, #e0e0e8 0%, #d8d8e0 100%);
}

#definitions-column .match-item.matched-correct {
    background: linear-gradient(135deg, #c4d9c8 0%, #b8d4bd 100%);
}

#definitions-column .match-item.matched-incorrect {
    background: linear-gradient(135deg, #f5d0d0 0%, #f0c5c5 100%);
}

.match-item {
    padding: 16px;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 14px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 15px;
    font-weight: 500;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    display: flex;
    align-items: center;
    gap: 12px;
}

.match-number {
    display: inline-block;
    min-width: 32px;
    font-weight: 700;
    color: var(--text-secondary);
    font-size: 14px;
}

.match-text {
    flex: 1;
    text-align: left;
}

.matched-number-display {
    font-size: 14px;
    font-weight: 700;
}

.match-number.number-correct {
    color: var(--success-color);
    font-weight: 800;
}

.match-number.number-incorrect {
    color: var(--error-color);
    font-weight: 800;
}

.match-item:hover {
    background: linear-gradient(135deg, #f8f9ff 0%, #faf5ff 100%);
    border-color: var(--accent-purple);
    transform: scale(1.02);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.15);
}

.match-item.selected {
    border-color: var(--accent-purple);
    background: linear-gradient(135deg, #f0f4ff 0%, #faf5ff 100%);
    box-shadow: 0 2px 8px rgba(139, 92, 246, 0.2);
}

.match-item.matched {
    border-color: var(--accent-purple);
    background: linear-gradient(135deg, #f0f4ff 0%, #faf5ff 100%);
    box-shadow: 0 2px 8px rgba(139, 92, 246, 0.2);
}

.match-item.matched-correct {
    border-color: var(--success-color);
    background: linear-gradient(135deg, #d4edda 0%, #c3e6cb 100%);
    box-shadow: 0 2px 8px rgba(0, 186, 124, 0.2);
}

.match-item.matched-incorrect {
    border-color: var(--error-color);
    background: linear-gradient(135deg, #fee 0%, #fdd 100%);
    box-shadow: 0 2px 8px rgba(244, 33, 46, 0.2);
}

.match-item.incorrect-match {
    border-color: var(--error-color);
    background: linear-gradient(135deg, #fee 0%, #fdd 100%);
    box-shadow: 0 2px 8px rgba(244, 33, 46, 0.2);
}

.quiz-actions-bar {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    background: #fafafa;
}

.actions-right {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
}

/* Results */
.results-container {
    padding: 20px;
    background: white;
}

.results-summary {
    text-align: center;
    padding: 40px 20px;
    margin-bottom: 24px;
    background: linear-gradient(135deg, #f0f4ff 0%, #faf5ff 100%);
    border-radius: 20px;
    border: 1px solid #e9d5ff;
}

.score-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    font-weight: 800;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.3);
}

.results-summary h3 {
    font-size: 22px;
    font-weight: 800;
    color: var(--text-primary);
    letter-spacing: -0.3px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    padding: 20px;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-radius: 16px;
    text-align: center;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.stat-card h4 {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-card .stat-value {
    font-size: 28px;
    font-weight: 800;
    color: var(--text-primary);
}

.question-review {
    padding: 20px;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-radius: 16px;
    border-left: 4px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.question-review.correct {
    border-left-color: var(--success-color);
}

.question-review.incorrect {
    border-left-color: var(--error-color);
}

.question-review h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.answer-review {
    margin-top: 10px;
    padding: 14px;
    background: white;
    border-radius: 12px;
    font-size: 14px;
    border: 1px solid var(--border-color);
}

.answer-review ul {
    margin: 8px 0 0 0;
    padding-left: 24px;
    list-style-position: inside;
}

.answer-review li {
    margin: 6px 0;
    padding-left: 0;
}

.answer-review.correct-answer {
    background: linear-gradient(135deg, #d4edda 0%, #c3e6cb 100%);
    color: #155724;
    border-color: var(--success-color);
}

.answer-review.user-answer {
    background: linear-gradient(135deg, #fff4e6 0%, #ffe4cc 100%);
    color: #8b5a00;
    border-color: #ffc107;
}

.answer-review.incorrect-answer {
    background: linear-gradient(135deg, #fee 0%, #fdd 100%);
    color: #721c24;
    border-color: var(--error-color);
}

/* Tutorial */
.tutorial-content {
    padding: 20px;
    background: white;
}

.tutorial-item {
    margin-bottom: 28px;
}

.tutorial-item h3 {
    font-size: 20px;
    font-weight: 800;
    margin-bottom: 12px;
    color: var(--text-primary);
    letter-spacing: -0.3px;
}

.tutorial-item p {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.6;
}

.format-example {
    margin-bottom: 20px;
    padding: 16px;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.format-example strong {
    display: block;
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.format-example pre {
    background: #1e1e1e;
    color: #d4d4d4;
    padding: 14px;
    border-radius: 8px;
    overflow-x: auto;
    font-size: 13px;
    font-family: 'Courier New', monospace;
    margin: 0;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .app-container {
        max-width: 100%;
    }
    
    .input-cards {
        flex-direction: column;
    }
    
    .match-container {
        grid-template-columns: 1fr;
    }
    
    .quiz-actions-bar {
        flex-direction: column;
    }
    
    .actions-right {
        width: 100%;
        flex-direction: column;
    }
    
    .actions-right .primary-btn,
    .actions-right .success-btn {
        width: 100%;
    }
    
    .btn-group {
        flex-direction: column;
    }
    
    .btn-group .primary-btn,
    .btn-group .secondary-btn {
        width: 100%;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .fill-blank-input {
        display: block;
        width: 100%;
        margin: 8px 0;
    }
}

@media (max-width: 480px) {
    .app-header {
        padding: 14px 16px;
    }
    
    .header-content h1 {
        font-size: 20px;
    }
    
    .section-header {
        padding: 16px;
    }
    
    .section-header h2 {
        font-size: 20px;
    }
    
    .input-cards,
    .textarea-wrapper,
    .preview-card,
    .quiz-top-bar,
    .quiz-content-card,
    .quiz-actions-bar {
        padding: 16px;
    }
}

/* Custom Modal */
.custom-modal {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    right: 0 !important;
    bottom: 0 !important;
    width: 100vw !important;
    height: 100vh !important;
    z-index: 10000 !important;
    display: none !important;
    align-items: center !important;
    justify-content: center !important;
    margin: 0 !important;
    padding: 0 !important;
    box-sizing: border-box !important;
}

.custom-modal[style*="display: flex"],
.custom-modal[style*="display:block"] {
    display: flex !important;
}

.modal-overlay {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    right: 0 !important;
    bottom: 0 !important;
    width: 100vw !important;
    height: 100vh !important;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 9999;
}

.modal-content {
    position: fixed !important;
    top: 50% !important;
    left: 50% !important;
    transform: translate(-50%, -50%) !important;
    background: var(--bg-primary);
    border-radius: 16px;
    padding: 24px;
    max-width: 300px;
    width: 60%;
    min-width: 250px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    z-index: 10001 !important;
    animation: modalSlideIn 0.2s ease-out;
    margin: 0 !important;
    box-sizing: border-box !important;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: translate(-50%, -60%) scale(0.95) !important;
    }
    to {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1) !important;
    }
}

.modal-content h3 {
    font-size: 20px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.modal-content p {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.5;
}

.modal-input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 15px;
    background: #fafafa;
    color: var(--text-primary);
    transition: all 0.2s;
    margin-bottom: 20px;
    box-sizing: border-box;
}

.modal-input:focus {
    outline: none;
    border-color: var(--twitter-blue);
    background: white;
    box-shadow: 0 0 0 3px rgba(29, 155, 240, 0.1);
}

.modal-buttons {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

.modal-buttons .primary-btn,
.modal-buttons .secondary-btn {
    min-width: 100px;
}

@media (max-width: 600px) {
    .modal-content {
        padding: 20px;
        max-width: 85%;
        width: 85%;
        min-width: 180px;
    }
    
    .modal-buttons {
        flex-direction: column-reverse;
    }
    
    .modal-buttons .primary-btn,
    .modal-buttons .secondary-btn {
        width: 100%;
    }
}

/* Footer */
.footer {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 30px 20px;
    margin-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-container {
    max-width: 900px;
    margin: 0 auto;
}

.footer .row {
    display: flex;
    justify-content: center;
    align-items: center;
}

.footer .col {
    width: 100%;
}

.footer .text-center {
    text-align: center;
}

.footer p {
    margin: 8px 0;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.9);
}

.footer a {
    color: white;
    text-decoration: none;
    transition: opacity 0.2s;
}

.footer a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

@media (max-width: 600px) {
    .footer {
        padding: 20px 16px;
    }
    
    .footer p {
        font-size: 13px;
        margin: 6px 0;
    }
}