/* CSS Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Japanese-inspired color palette (Default Theme) */
    --primary: #8B4513;
    --primary-light: #A0522D;
    --primary-dark: #654321;
    --secondary: #2F4F4F;
    --accent: #CD853F;
    --success: #2E8B57;
    --error: #B22222;
    --warning: #DAA520;
    
    /* Neutrals */
    --bg-primary: #FDF5E6;
    --bg-secondary: #FAF0E6;
    --bg-card: #FFFAF0;
    --text-primary: #2C1810;
    --text-secondary: #5C4033;
    --text-muted: #8B7355;
    --border: #D2B48C;
    --shadow: rgba(139, 69, 19, 0.15);
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Typography */
    --font-sans: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-serif: 'Noto Serif JP', Georgia, serif;
    --font-mono: 'SF Mono', Monaco, monospace;
    
    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Dark Monokai Theme */
[data-theme="dark-monokai"] {
    --primary: #F92672;
    --primary-light: #FD5F90;
    --primary-dark: #AE2757;
    --secondary: #66D9EF;
    --accent: #A6E22E;
    --success: #A6E22E;
    --error: #F92672;
    --warning: #FD971F;
    
    --bg-primary: #272822;
    --bg-secondary: #3E3D32;
    --bg-card: #3E3D32;
    --text-primary: #F8F8F2;
    --text-secondary: #A59F85;
    --text-muted: #75715E;
    --border: #49483E;
    --shadow: rgba(0, 0, 0, 0.3);
}

/* Light Catpuccin Theme */
[data-theme="light-catpuccin"] {
    --primary: #D20F39;
    --primary-light: #E5484D;
    --primary-dark: #B32630;
    --secondary: #1A66B8;
    --accent: #DF8E1D;
    --success: #40A02B;
    --error: #D20F39;
    --warning: #DF8E1D;
    
    --bg-primary: #EFF1F5;
    --bg-secondary: #E6E9EF;
    --bg-card: #DCE0E8;
    --text-primary: #4C4F69;
    --text-secondary: #6C6F85;
    --text-muted: #9CA0B0;
    --border: #CCD0DA;
    --shadow: rgba(0, 0, 0, 0.1);
}

/* Light Gruvbox Theme */
[data-theme="light-gruvbox"] {
    --primary: #CC241D;
    --primary-light: #FB4934;
    --primary-dark: #9D1C15;
    --secondary: #458588;
    --accent: #B8BB26;
    --success: #98971A;
    --error: #CC241D;
    --warning: #D79921;
    
    --bg-primary: #FBF1C7;
    --bg-secondary: #EBDBB2;
    --bg-card: #F5EEBF;
    --text-primary: #3C3836;
    --text-secondary: #5C5854;
    --text-muted: #7C7060;
    --border: #D5C4A1;
    --shadow: rgba(60, 56, 54, 0.15);
}

body {
    font-family: var(--font-sans);
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

/* App Container */
#app {
    max-width: 900px;
    margin: 0 auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.app-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: var(--spacing-lg) var(--spacing-xl);
    box-shadow: 0 2px 10px var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-icon {
    font-size: 2rem;
}

.logo h1 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.main-nav {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.nav-btn {
    background: rgba(255, 255, 255, 0.15);
    border: none;
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.25);
}

.nav-btn.active {
    background: white;
    color: var(--primary);
    font-weight: 500;
}

/* Header Controls */
.header-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.header-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Theme Switcher */
.theme-switcher {
    position: relative;
}

.theme-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 1.2rem;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.theme-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: var(--spacing-xs);
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 12px var(--shadow);
    display: none;
    z-index: 200;
    min-width: 180px;
}

.theme-dropdown.show {
    display: block;
}

.theme-option {
    display: block;
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: none;
    border: none;
    color: var(--text-primary);
    text-align: left;
    cursor: pointer;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    transition: background var(--transition-fast);
}

.theme-option:hover {
    background: var(--bg-secondary);
}

.theme-option:first-child {
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.theme-option:last-child {
    border-radius: 0 0 var(--radius-md) var(--radius-md);
}

/* Main Content */
.main-content {
    flex: 1;
    padding: var(--spacing-xl);
}

/* View Management */
.view {
    display: none;
    animation: fadeIn 0.3s ease;
}

.view.active {
    display: block;
}

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

/* Quiz View */
.quiz-container {
    max-width: 700px;
    margin: 0 auto;
}

.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--bg-card);
    border-radius: var(--radius-md);
    box-shadow: 0 2px 8px var(--shadow);
}

.progress-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.question-counter {
    font-weight: 500;
    color: var(--text-secondary);
}

.streak-indicator {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: linear-gradient(135deg, #FF6B35 0%, #F7931E 100%);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-xl);
    font-weight: 600;
}

.session-stats {
    display: flex;
    gap: var(--spacing-md);
}

.correct-count {
    color: var(--success);
    font-weight: 600;
}

.wrong-count {
    color: var(--error);
    font-weight: 600;
}

/* Question Card */
.question-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: 0 4px 20px var(--shadow);
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.question-type-badge {
    display: inline-block;
    background: var(--secondary);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-md);
}

.question-text {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.context-box {
    background: var(--bg-secondary);
    border-left: 4px solid var(--accent);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.context-box p {
    color: var(--text-secondary);
    font-style: italic;
}

/* Options */
.options-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.option-btn {
    background: white;
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    cursor: pointer;
    text-align: left;
    font-family: var(--font-sans);
    font-size: 1.1rem;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    line-height: 1.8;
}

/* Furigana display in option buttons */
.option-btn ruby {
    ruby-align: center;
}

.option-btn rt.furigana {
    font-size: 0.5em;
    color: var(--primary);
}

.option-btn:hover:not(:disabled) {
    border-color: var(--primary);
    background: var(--bg-secondary);
    transform: translateX(5px);
}

.option-btn:disabled {
    cursor: default;
}

.option-btn.correct {
    background: #E8F5E9;
    border-color: var(--success);
    color: var(--success);
}

.option-btn.incorrect {
    background: #FFEBEE;
    border-color: var(--error);
    color: var(--error);
}

.option-letter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--bg-secondary);
    border-radius: 50%;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.option-btn.correct .option-letter {
    background: var(--success);
    color: white;
}

.option-btn.incorrect .option-letter {
    background: var(--error);
    color: white;
}

/* Answer Feedback */
.answer-feedback {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 2px solid var(--border);
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.feedback-content {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.feedback-icon {
    font-size: 3rem;
    flex-shrink: 0;
}

.feedback-text h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-sm);
}

.feedback-text p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.grammar-note {
    background: #FFF8E1;
    border-left: 4px solid var(--warning);
    padding: var(--spacing-md);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-size: 0.95rem;
}

.next-btn {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: white;
    border: none;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    width: 100%;
}

.next-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

/* Quiz Controls */
.quiz-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.control-btn {
    background: white;
    border: 2px solid var(--border);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-family: var(--font-sans);
    transition: all var(--transition-fast);
}

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

.difficulty-selector {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.difficulty-selector label {
    font-weight: 500;
    color: var(--text-secondary);
}

.difficulty-selector select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    background: white;
    font-family: var(--font-sans);
    cursor: pointer;
}

/* Toggle Control */
.toggle-control {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 26px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border);
    transition: var(--transition-fast);
    border-radius: 26px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: var(--transition-fast);
    border-radius: 50%;
}

.toggle-switch input:checked + .toggle-slider {
    background-color: var(--primary);
}

.toggle-switch input:checked + .toggle-slider:before {
    transform: translateX(22px);
}

.toggle-label {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Review View */
.review-container h2,
.stats-container h2,
.settings-container h2 {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    margin-bottom: var(--spacing-xl);
    color: var(--text-primary);
}

.review-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: var(--bg-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: 0 2px 8px var(--shadow);
    text-align: center;
    transition: transform var(--transition-fast);
}

.stat-card:hover {
    transform: translateY(-3px);
}

.stat-card.large {
    padding: var(--spacing-xl);
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: var(--spacing-xs);
}

.stat-card.large .stat-number {
    font-size: 3rem;
}

.stat-label {
    display: block;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.review-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.primary-btn {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: white;
    border: none;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

.secondary-btn {
    background: white;
    border: 2px solid var(--border);
    color: var(--text-primary);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.danger-btn {
    background: var(--error);
    color: white;
    border: none;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.danger-btn:hover {
    background: #8B0000;
}

/* Grammar List */
.grammar-list-container {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: 0 2px 8px var(--shadow);
}

.grammar-list-container h3 {
    font-family: var(--font-serif);
    margin-bottom: var(--spacing-lg);
}

.filter-bar {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.filter-bar input,
.filter-bar select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    flex: 1;
    min-width: 200px;
}

.grammar-list {
    max-height: 400px;
    overflow-y: auto;
}

.grammar-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border);
    transition: background var(--transition-fast);
}

.grammar-item:hover {
    background: var(--bg-secondary);
}

.grammar-item:last-child {
    border-bottom: none;
}

.grammar-info h4 {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
}

.grammar-info p {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.grammar-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.status-badge {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
}

.status-badge.mastered {
    background: #E8F5E9;
    color: var(--success);
}

.status-badge.learning {
    background: #FFF3E0;
    color: var(--warning);
}

.status-badge.new {
    background: #E3F2FD;
    color: #1976D2;
}

.sr-due {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Statistics View */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.chart-container {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: 0 2px 8px var(--shadow);
    margin-bottom: var(--spacing-xl);
}

.chart-container h3 {
    font-family: var(--font-serif);
    margin-bottom: var(--spacing-lg);
}

.activity-chart {
    display: flex;
    align-items: flex-end;
    justify-content: space-around;
    height: 200px;
    gap: var(--spacing-md);
}

.chart-bar {
    flex: 1;
    background: linear-gradient(180deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    min-width: 40px;
    position: relative;
    transition: all var(--transition-fast);
}

.chart-bar:hover {
    opacity: 0.8;
}

.chart-bar .bar-label {
    position: absolute;
    bottom: -25px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.8rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

.chart-bar .bar-value {
    position: absolute;
    top: -25px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary);
}

.weak-areas {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: 0 2px 8px var(--shadow);
}

.weak-areas h3 {
    font-family: var(--font-serif);
    margin-bottom: var(--spacing-lg);
}

.weak-area-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border);
}

.weak-area-item:last-child {
    border-bottom: none;
}

.weak-area-name {
    font-weight: 500;
}

.weak-area-accuracy {
    color: var(--error);
    font-weight: 600;
}

/* Settings View */
.settings-container {
    max-width: 700px;
}

.settings-section {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    box-shadow: 0 2px 8px var(--shadow);
}

.settings-section h3 {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    margin-bottom: var(--spacing-lg);
    color: var(--primary);
    border-bottom: 2px solid var(--border);
    padding-bottom: var(--spacing-sm);
}

.setting-item {
    margin-bottom: var(--spacing-lg);
}

.setting-item:last-child {
    margin-bottom: 0;
}

.setting-item label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

.setting-item input[type="number"] {
    width: 100px;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 1rem;
}

.setting-item.checkbox {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.setting-item.checkbox label {
    margin-bottom: 0;
}

.setting-item input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.setting-hint {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

.checkbox-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-sm);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast);
}

.checkbox-label:hover {
    background: var(--bg-secondary);
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
}

.settings-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

/* Footer */
.app-footer {
    background: var(--secondary);
    color: white;
    text-align: center;
    padding: var(--spacing-lg);
    margin-top: auto;
}

.app-footer p {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--secondary);
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    z-index: 1000;
    animation: toastIn 0.3s ease;
}

@keyframes toastIn {
    from { opacity: 0; transform: translateX(-50%) translateY(20px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1001;
}

.modal-content {
    background: var(--bg-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    max-width: 400px;
    width: 90%;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    animation: modalIn 0.3s ease;
}

@keyframes modalIn {
    from { opacity: 0; transform: scale(0.9); }
    to { opacity: 1; transform: scale(1); }
}

.modal-content h3 {
    font-family: var(--font-serif);
    margin-bottom: var(--spacing-md);
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
}

/* Dictionary Popup */
.dictionary-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1001;
}

.dictionary-content {
    background: var(--bg-card);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    max-width: 400px;
    width: 90%;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    animation: modalIn 0.3s ease;
    position: relative;
}

.dictionary-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-muted);
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.dictionary-close:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.dictionary-word {
    margin-bottom: var(--spacing-lg);
}

.dictionary-japanese {
    display: block;
    font-family: var(--font-serif);
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.dictionary-reading {
    display: block;
    font-size: 1rem;
    color: var(--text-secondary);
}

.dictionary-meaning {
    font-size: 1.1rem;
    color: var(--text-primary);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.dictionary-examples {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Furigana styling */
.furigana {
    font-size: 0.6em;
    vertical-align: super;
    color: var(--primary);
    cursor: pointer;
    font-weight: 500;
}

.word-clickable {
    cursor: pointer;
    border-bottom: 1px dashed var(--primary);
    transition: all var(--transition-fast);
}

.word-clickable:hover {
    background: rgba(139, 69, 19, 0.1);
    border-bottom-style: solid;
}

/* Responsive Design */
@media (max-width: 768px) {
    .main-content {
        padding: var(--spacing-md);
    }
    
    .app-header {
        padding: var(--spacing-md);
    }
    
    .logo h1 {
        font-size: 1.2rem;
    }
    
    .main-nav {
        justify-content: center;
    }
    
    .nav-btn {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.8rem;
    }
    
    .question-text {
        font-size: 1.2rem;
    }
    
    .quiz-header {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .quiz-controls {
        flex-direction: column;
        align-items: stretch;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .review-stats {
        grid-template-columns: 1fr;
    }
    
    .review-actions {
        flex-direction: column;
    }
    
    .settings-actions {
        flex-direction: column;
    }
    
    .header-top {
        flex-direction: row;
        align-items: center;
    }
    
    .header-controls {
        margin-left: auto;
    }
    
    .theme-btn {
        width: 36px;
        height: 36px;
    }
    
    .theme-dropdown {
        right: 0;
        min-width: 160px;
    }
    
    .toggle-control {
        justify-content: center;
    }
    
    .difficulty-selector {
        justify-content: center;
    }
    
    .question-card {
        padding: var(--spacing-lg);
    }
    
    .option-btn {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 1rem;
    }
    
    .feedback-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    
    .feedback-icon {
        font-size: 2rem;
    }
    
    .dictionary-content {
        padding: var(--spacing-lg);
    }
    
    .dictionary-japanese {
        font-size: 1.5rem;
    }
    
    .grammar-list-container {
        margin-top: var(--spacing-lg);
    }
    
    .filter-bar {
        flex-direction: column;
    }
    
    .filter-bar input,
    .filter-bar select {
        width: 100%;
    }
}

/* Extra small devices */
@media (max-width: 480px) {
    .logo-icon {
        font-size: 1.5rem;
    }
    
    .logo h1 {
        font-size: 1rem;
    }
    
    .nav-btn {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 0.75rem;
    }
    
    .question-text {
        font-size: 1.1rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .stat-card.large .stat-number {
        font-size: 2.5rem;
    }
    
    .quiz-header {
        padding: var(--spacing-sm);
    }
    
    .session-stats {
        gap: var(--spacing-sm);
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-light);
}

/* Selection Color */
::selection {
    background: var(--accent);
    color: white;
}