:root {
    /* Color Palette - Dark Purple (default) */
    --bg-primary: #0f0f1e;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #252541;
    --accent-primary: #6c5ce7;
    --accent-secondary: #a29bfe;
    --accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --text-primary: #ffffff;
    --text-secondary: #b8b8d4;
    --text-muted: #6e6e8f;
    --success: #00d4aa;
    --danger: #ff6b9d;
    --warning: #feca57;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 20px rgba(108, 92, 231, 0.3);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Light Theme */
[data-theme="light"] {
    --bg-primary: #f5f5f7;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e8e8ed;
    --accent-primary: #5e4db2;
    --accent-secondary: #8b7fc7;
    --accent-gradient: linear-gradient(135deg, #5e4db2 0%, #7b68c4 100%);
    --text-primary: #1d1d1f;
    --text-secondary: #424245;
    --text-muted: #86868b;
    --success: #00a884;
    --danger: #e63946;
    --warning: #f59e0b;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 20px rgba(94, 77, 178, 0.2);
}

/* Ocean Theme */
[data-theme="ocean"] {
    --bg-primary: #0a1929;
    --bg-secondary: #132f4c;
    --bg-tertiary: #1e4976;
    --accent-primary: #00b4d8;
    --accent-secondary: #48cae4;
    --accent-gradient: linear-gradient(135deg, #0077b6 0%, #00b4d8 100%);
    --text-primary: #e8f4f8;
    --text-secondary: #b0d4e3;
    --text-muted: #6b9ab8;
    --success: #06ffa5;
    --danger: #ff006e;
    --warning: #ffbe0b;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px rgba(0, 180, 216, 0.3);
}

/* Forest Theme */
[data-theme="forest"] {
    --bg-primary: #0d1b0d;
    --bg-secondary: #1a2f1a;
    --bg-tertiary: #2d4a2d;
    --accent-primary: #52b788;
    --accent-secondary: #74c69d;
    --accent-gradient: linear-gradient(135deg, #40916c 0%, #52b788 100%);
    --text-primary: #f1faee;
    --text-secondary: #d8f3dc;
    --text-muted: #95d5b2;
    --success: #a7c957;
    --danger: #e63946;
    --warning: #f4a261;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px rgba(82, 183, 136, 0.3);
}

/* Sunset Theme */
[data-theme="sunset"] {
    --bg-primary: #1a0f14;
    --bg-secondary: #2d1b24;
    --bg-tertiary: #4a2c3a;
    --accent-primary: #ff6b9d;
    --accent-secondary: #ffa6c1;
    --accent-gradient: linear-gradient(135deg, #ff6b9d 0%, #ff8fab 100%);
    --text-primary: #fff5f7;
    --text-secondary: #ffd6e0;
    --text-muted: #ffb3c6;
    --success: #06ffa5;
    --danger: #ff4d6d;
    --warning: #ffbe0b;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px rgba(255, 107, 157, 0.3);
}

/* Midnight Theme */
[data-theme="midnight"] {
    --bg-primary: #000000;
    --bg-secondary: #0d0d0d;
    --bg-tertiary: #1a1a1a;
    --accent-primary: #ffffff;
    --accent-secondary: #e0e0e0;
    --accent-gradient: linear-gradient(135deg, #ffffff 0%, #cccccc 100%);
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --text-muted: #666666;
    --success: #00ff88;
    --danger: #ff4444;
    --warning: #ffaa00;
    --shadow-sm: 0 2px 8px rgba(255, 255, 255, 0.05);
    --shadow-md: 0 4px 16px rgba(255, 255, 255, 0.08);
    --shadow-lg: 0 8px 32px rgba(255, 255, 255, 0.12);
    --shadow-glow: 0 0 20px rgba(255, 255, 255, 0.15);
}


/* Utility Classes */
.hidden {
    display: none !important;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

#app {
    min-height: 100vh;
    position: relative;
}

/* View Management */
.view {
    min-height: 100vh;
    opacity: 1;
    transition: opacity var(--transition-normal);
}

.view.hidden {
    display: none;
    opacity: 0;
}

/* Header */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-md);
    background: var(--bg-secondary);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.app-header h1 {
    font-size: 1.25rem;
    font-weight: 600;
    flex: 1;
    text-align: center;
}

/* Buttons */
.btn {
    border: none;
    background: none;
    color: var(--text-primary);
    cursor: pointer;
    font-family: inherit;
    font-size: 1rem;
    transition: all var(--transition-fast);
    outline: none;
    -webkit-tap-highlight-color: transparent;
}

.btn:active {
    transform: scale(0.95);
}

.btn-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    background: rgba(255, 255, 255, 0.05);
}

.btn-icon:hover {
    background: rgba(255, 255, 255, 0.1);
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 500;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

.btn-small {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    border-radius: var(--radius-sm);
    background: var(--accent-primary);
    color: white;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-full-width {
    width: 100%;
}

.btn-control {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-control:hover {
    background: rgba(255, 255, 255, 0.1);
}

.btn-play {
    width: 80px;
    height: 80px;
    background: var(--accent-gradient);
    box-shadow: var(--shadow-glow);
    font-size: 2rem;
}

/* Welcome Screen */
.welcome-container {
    max-width: 600px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
    text-align: center;
}

.welcome-icon {
    font-size: 5rem;
    margin-bottom: var(--spacing-md);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

.welcome-container h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.welcome-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.welcome-steps {
    display: grid;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.step {
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.step-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.step h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
}

.step p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

/* Welcome Config */
.welcome-config {
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    margin-bottom: var(--spacing-xl);
    text-align: left;
}

.welcome-config h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
    text-align: center;
}


/* Playlists Grid */
.playlists-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-md);
    padding: var(--spacing-md);
}

.playlist-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    border: 1px solid rgba(255, 255, 255, 0.05);
    position: relative;
    overflow: hidden;
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.playlist-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--accent-gradient);
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.playlist-card:hover::before {
    transform: scaleX(1);
}

.playlist-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(108, 92, 231, 0.3);
}

.playlist-card.dragging {
    opacity: 0.4;
    transform: scale(0.97);
    cursor: grabbing;
    box-shadow: var(--shadow-lg);
}

.playlist-card.drag-over {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px var(--accent-primary);
    transform: translateY(-2px);
}

.playlist-drag-handle {
    color: var(--text-muted);
    font-size: 1.1rem;
    cursor: grab;
    user-select: none;
    padding: 0.25rem 0.25rem 0.25rem 0;
    align-self: center;
    flex-shrink: 0;
    opacity: 0.5;
    transition: opacity var(--transition-fast);
}

.playlist-card:hover .playlist-drag-handle {
    opacity: 1;
}


.playlist-icon {
    font-size: 3rem;
    line-height: 1;
    flex-shrink: 0;
}

.playlist-info {
    flex: 1;
    min-width: 0;
}

.playlist-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
}

.playlist-description {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-xs);
    line-height: 1.4;
}

.playlist-meta {
    color: var(--text-muted);
    font-size: 0.875rem;
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.language-badge {
    background: rgba(108, 92, 231, 0.2);
    color: var(--accent);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 500;
}

.sentence-count {
    padding: 0.25rem 0;
}

/* Player Container */
.player-container {
    padding: var(--spacing-xl) var(--spacing-md);
    background: var(--bg-secondary);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.current-sentence-display {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    min-height: 120px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.target-text {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.native-text {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

.playback-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.progress-info {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Sentences List */
.sentences-list {
    padding: var(--spacing-md);
}

.list-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.list-header h3 {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

.sentence-item {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    cursor: grab;
    transition: all var(--transition-fast);
    border: 2px solid transparent;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.sentence-item:active {
    cursor: grabbing;
}

.sentence-item.dragging {
    opacity: 0.5;
    cursor: grabbing;
}

.drag-handle {
    color: var(--text-muted);
    font-size: 1.2rem;
    cursor: grab;
    user-select: none;
    padding: 0 0.25rem;
}

.sentence-content {
    flex: 1;
    min-width: 0;
    cursor: pointer;
}

.sentence-item:hover {
    background: var(--bg-tertiary);
}

.sentence-item.active {
    border-color: var(--accent-primary);
    background: rgba(108, 92, 231, 0.1);
}

.sentence-item.disabled {
    opacity: 0.5;
}

.sentence-item.disabled .sentence-target,
.sentence-item.disabled .sentence-native {
    text-decoration: line-through;
}

.sentence-item.playing {
    border-color: var(--accent-primary);
    background: rgba(108, 92, 231, 0.15);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

    0%,
    100% {
        box-shadow: 0 0 0 0 rgba(108, 92, 231, 0.4);
    }

    50% {
        box-shadow: 0 0 0 8px rgba(108, 92, 231, 0);
    }
}

.sentence-target {
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.sentence-native {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.sentence-memo {
    color: var(--text-muted);
    font-size: 0.8rem;
    font-style: italic;
    margin-top: 0.25rem;
    opacity: 0.8;
}

.sentence-actions {
    display: flex;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
}

.sentence-actions .btn {
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.05);
}

.sentence-actions .btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.sentence-actions .btn.danger:hover {
    background: var(--danger);
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--spacing-md);
    animation: fadeIn var(--transition-normal);
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: slideUp var(--transition-normal);
}

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

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.modal-header h2 {
    font-size: 1.5rem;
}

/* Forms */
form {
    padding: var(--spacing-md);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.875rem;
}

/* Checkbox label alignment */
.form-group label input[type="checkbox"] {
    width: auto;
    margin-right: 0.5rem;
    vertical-align: middle;
    cursor: pointer;
}

.form-group label span {
    vertical-align: middle;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    background: var(--bg-tertiary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
    padding: 0.75rem;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

.form-group small {
    display: block;
    margin-top: var(--spacing-xs);
    color: var(--text-muted);
    font-size: 0.8125rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.form-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
    margin-top: var(--spacing-lg);
}

/* Recording Controls */
.recording-controls {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    align-items: center;
}

.recording-status {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.recording-status.recording {
    color: var(--danger);
    animation: blink 1s infinite;
}

@keyframes blink {

    0%,
    50% {
        opacity: 1;
    }

    51%,
    100% {
        opacity: 0.3;
    }
}

/* Menu Modal */
.modal-menu {
    max-width: 300px;
}

.menu-item {
    width: 100%;
    text-align: left;
    padding: var(--spacing-md);
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1rem;
    cursor: pointer;
    transition: background var(--transition-fast);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.menu-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

.menu-item.danger {
    color: var(--danger);
}

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

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-muted);
}

.empty-state.hidden {
    display: none;
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state h2,
.empty-state h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

.empty-state p {
    margin-bottom: var(--spacing-md);
}

/* Responsive Design */
@media (max-width: 768px) {
    .welcome-container h1 {
        font-size: 2rem;
    }

    .playlists-grid {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .target-text {
        font-size: 1.25rem;
    }

    .native-text {
        font-size: 1rem;
    }

    .sentence-item {
        flex-wrap: wrap;
    }

    .sentence-actions {
        width: 100%;
        justify-content: flex-end;
        padding-left: 2rem;
    }
}

/* Test View */
.test-container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
}

.test-progress {
    text-align: center;
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
    color: var(--text-secondary);
}

.test-prompt {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.test-prompt-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
}

.test-prompt-text {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
}

.test-input-area {
    margin-bottom: var(--spacing-xl);
}

.test-input-area textarea {
    width: 100%;
    background: var(--bg-tertiary);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1.125rem;
    resize: vertical;
    min-height: 100px;
    margin-bottom: var(--spacing-md);
}

.test-input-area textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.1);
}

.recognized-text {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-size: 1.125rem;
}

.test-feedback {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
}

.feedback-message {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.feedback-message.correct {
    color: var(--success);
}

.feedback-message.incorrect {
    color: var(--danger);
}

.feedback-comparison {
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    text-align: left;
}

.feedback-comparison div {
    margin-bottom: var(--spacing-xs);
}

.feedback-comparison strong {
    color: var(--text-secondary);
}

.test-complete {
    text-align: center;
    padding: var(--spacing-xl);
}

.test-complete-icon {
    font-size: 5rem;
    margin-bottom: var(--spacing-md);
    animation: bounce 1s ease;
}

@keyframes bounce {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-20px);
    }
}

/* Icon Picker */
.icon-picker {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(50px, 1fr));
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    max-width: 100%;
}

/* Responsive icon grid */
@media (max-width: 768px) {
    .icon-picker {
        grid-template-columns: repeat(auto-fit, minmax(45px, 1fr));
    }
}

@media (max-width: 480px) {
    .icon-picker {
        grid-template-columns: repeat(auto-fit, minmax(40px, 1fr));
    }
}

.icon-option,
.icon-option-create {
    width: 100%;
    aspect-ratio: 1;
    font-size: 2rem;
    background: var(--bg-secondary);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-option:hover,
.icon-option-create:hover {
    background: rgba(108, 92, 231, 0.2);
    border-color: var(--accent);
    transform: scale(1.1);
}

.icon-option.selected,
.icon-option-create.selected {
    background: rgba(108, 92, 231, 0.5);
    border-color: var(--accent);
    border-width: 3px;
    box-shadow: 0 0 0 3px var(--accent), 0 0 20px rgba(108, 92, 231, 0.6);
    transform: scale(1.05);
}

.test-final-score {
    font-size: 2rem;
    font-weight: 600;
    margin: var(--spacing-lg) 0;
    color: var(--accent-primary);
}

.test-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-xl);
}

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

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Toast Notifications */
#toast-container {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    pointer-events: none;
}

.toast {
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    border-left: 4px solid var(--accent-primary);
    min-width: 250px;
    max-width: 400px;
    pointer-events: auto;
    animation: slideIn 0.3s ease-out;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.toast.success {
    border-left-color: #10b981;
}

.toast.error {
    border-left-color: #ef4444;
}

.toast.warning {
    border-left-color: #f59e0b;
}

.toast-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

.toast-message {
    flex: 1;
}

.toast.hiding {
    animation: slideOut 0.3s ease-in forwards;
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }

    to {
        transform: translateX(400px);
        opacity: 0;
    }
}

/* Test Answer Diff Styles */
.diff-container {
    margin: var(--spacing-md) 0;
}

.diff-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
}

.diff-text {
    font-size: 1.5rem;
    line-height: 1.8;
}

.char-correct {
    color: var(--text-primary);
}

.char-wrong {
    color: #ef4444;
}

.char-missing {
    color: #10b981;
}

/* Theme Selector */
.theme-option {
    cursor: pointer;
    transition: transform var(--transition-fast);
}

.theme-option:hover {
    transform: scale(1.05);
}

.theme-option.active .theme-preview {
    box-shadow: 0 0 0 3px var(--accent-primary) !important;
}

.theme-preview {
    height: 120px;
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: 0.5rem;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
}

.theme-name {
    text-align: center;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

/* Cloud Sync Tabs */
.cloud-tabs {
    display: flex;
    border-bottom: 2px solid rgba(255, 255, 255, 0.05);
    margin-bottom: 1rem;
}

.cloud-tab {
    flex: 1;
    padding: 0.75rem 1rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px; /* overlap border-bottom */
}

.cloud-tab:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.cloud-tab.active {
    color: var(--accent-primary);
    border-bottom-color: var(--accent-primary);
}

.cloud-panel {
    display: none;
    min-height: 280px;
}

.cloud-panel.active {
    display: block;
    animation: fadeIn var(--transition-fast);
}