/* ==========================================================================
   Welcome Screen Styles
   .welcome-content, .language-selector, .new-user-setup,
   .returning-user-welcome, .user-stats, .how-it-works, .unlock-tiers,
   .session-settings, .mode-option, assessment cards on welcome
   ========================================================================== */

/* Welcome Screen */
.welcome-content {
    background: var(--color-surface);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.welcome-content h2 {
    margin-top: 0;
    font-size: 1.5rem;
}

/* Language Selector */
.language-selector-container {
    display: flex;
    justify-content: flex-end;
    margin-bottom: var(--spacing-md);
}

.language-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
}

.language-icon {
    font-size: 1.25rem;
}

.language-select {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.9rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    color: var(--color-text);
    cursor: pointer;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.language-select:hover {
    border-color: var(--color-primary);
}

.language-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(88, 86, 214, 0.2);
}

/* Dark mode adjustments for language selector */
[data-theme="dark"] .language-select {
    background: var(--color-surface);
    border-color: var(--color-border);
}

.intro-guidance {
    background: var(--color-surface);
    border-left: 4px solid var(--color-primary);
    padding: var(--spacing-md) var(--spacing-lg);
    margin: var(--spacing-lg) 0;
    text-align: left;
}

.intro-guidance p {
    margin: 0 0 var(--spacing-sm);
}

.intro-guidance p:last-child {
    margin-bottom: 0;
}

.disclaimer {
    background: #f8f9fa;
    border: 1px solid var(--color-border);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin: var(--spacing-lg) 0;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* New User Setup */
.new-user-setup {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.welcome-intro {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xl);
}

.username-setup {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    max-width: 400px;
    margin: 0 auto;
}

.username-setup label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.username-setup input {
    width: 100%;
    padding: var(--spacing-md);
    font-size: 1.1rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    text-align: center;
    transition: border-color 0.2s;
}

.username-setup input:focus {
    outline: none;
    border-color: var(--color-primary);
}

.username-hint {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin: var(--spacing-sm) 0 0;
}

/* Returning User Welcome */
.returning-user-welcome {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.returning-user-welcome h2 {
    color: var(--color-primary);
}

.user-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-lg);
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-item .stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
}

.stat-item .stat-label {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* Import Data Section */
.import-data-section {
    margin-bottom: var(--spacing-xl);
}

.import-notice {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
    background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%);
    border: 2px solid var(--color-success);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.import-icon {
    font-size: 2.5rem;
    line-height: 1;
}

.import-content {
    flex: 1;
}

.import-content h4 {
    margin: 0 0 var(--spacing-xs);
    color: var(--color-text);
}

.import-content p {
    margin: 0 0 var(--spacing-md);
    color: var(--color-text-muted);
}

.import-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* How It Works */
.how-it-works {
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-lg);
    background: #f8fafc;
    border-radius: var(--radius-lg);
}

.how-it-works h3 {
    margin: 0 0 var(--spacing-md);
    font-size: 1.1rem;
}

.how-it-works > p {
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-muted);
}

.instructions-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.instruction-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
    text-align: left;
}

.instruction-icon {
    font-size: 1.5rem;
    line-height: 1;
}

.instruction-item strong {
    display: block;
    margin-bottom: var(--spacing-xs);
}

.instruction-item p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

/* Theory Section */
.theory-section {
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border-radius: var(--radius-lg);
}

.theory-section h3 {
    margin: 0 0 var(--spacing-md);
    font-size: 1.1rem;
}

.theory-section > p {
    margin-bottom: var(--spacing-lg);
}

.theory-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.theory-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.7);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--color-text);
    transition: background 0.2s;
}

.theory-link:hover {
    background: rgba(255, 255, 255, 0.9);
}

.link-icon {
    font-size: 1.2rem;
}

.youtube-embed {
    display: block;
    text-decoration: none;
    color: var(--color-text);
    background: rgba(255, 255, 255, 0.7);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: background 0.2s, box-shadow 0.2s;
}

.youtube-embed:hover {
    background: rgba(255, 255, 255, 0.9);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.youtube-thumbnail {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: #000;
}

.youtube-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.youtube-play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0.8;
    transition: opacity 0.2s, transform 0.2s;
}

.youtube-embed:hover .youtube-play-btn {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.1);
}

.youtube-label {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    font-weight: 500;
}

/* Unlock Preview */
.unlocks-preview {
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, #ddd6fe 0%, #c4b5fd 100%);
    border-radius: var(--radius-lg);
}

.unlocks-preview h3 {
    margin: 0 0 var(--spacing-sm);
    font-size: 1.1rem;
}

.unlocks-preview > p {
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-muted);
}

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

.unlock-tier {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(255, 255, 255, 0.7);
    border-radius: var(--radius-md);
}

.unlock-count {
    font-weight: 700;
    color: var(--color-primary);
    min-width: 40px;
}

.unlock-label {
    font-size: 0.9rem;
    color: var(--color-text);
}

.unlock-status {
    font-size: 0.9rem;
    opacity: 0.6;
}

/* Unlocked state */
.unlock-tier.unlocked {
    background: rgba(34, 197, 94, 0.15);
    border-left: 3px solid var(--color-success);
}

.unlock-tier.unlocked .unlock-status {
    opacity: 1;
}

.unlock-tier.unlocked .unlock-count {
    color: var(--color-success);
}

.unlock-tier.unlocked .unlock-label {
    color: var(--color-text);
}

/* Locked state - slightly muted */
.unlock-tier:not(.unlocked) {
    opacity: 0.7;
}

.unlock-tier:not(.unlocked) .unlock-label {
    color: var(--color-text-muted);
}

/* Unlock Tier Special Highlight */
.unlock-tier-special {
    background: linear-gradient(135deg, rgba(88, 86, 214, 0.1), rgba(124, 122, 255, 0.1));
    border-left: 3px solid var(--color-primary);
    padding-left: var(--spacing-sm);
    border-radius: var(--radius-sm);
}

/* Session Settings */
.session-settings {
    margin: var(--spacing-xl) 0;
    text-align: center;
}

.stem-count-label {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.stem-count-label select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    background: var(--color-surface);
}

/* Welcome Actions */
.welcome-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    margin: var(--spacing-xl) 0;
}

.welcome-actions .btn-large {
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: 1.1rem;
}

/* Welcome Assessment Cards */
.welcome-assessments-grid {
    margin: var(--spacing-xl) 0;
}

.welcome-assessments-grid h3 {
    margin: 0 0 var(--spacing-md) 0;
    font-size: 1.1rem;
    color: var(--color-text);
}

.welcome-assessment-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.welcome-assessment-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    cursor: pointer;
    transition: all 0.2s ease;
}

.welcome-assessment-card:hover:not(.locked) {
    border-color: var(--color-primary);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.welcome-assessment-card.locked {
    opacity: 0.55;
    cursor: default;
}

.wa-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
    gap: var(--spacing-sm);
}

.wa-card-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-text);
}

.wa-card-badge {
    font-size: 0.65rem;
    padding: 2px var(--spacing-xs);
    background: var(--color-primary);
    color: white;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
    white-space: nowrap;
    flex-shrink: 0;
}

.wa-card-desc {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    margin: 0 0 var(--spacing-sm) 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.wa-card-meta {
    display: flex;
    gap: var(--spacing-md);
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.wa-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.wa-card-lock-info {
    font-size: 0.75rem;
    color: var(--color-warning);
}

.wa-card-stats {
    font-size: 0.75rem;
    color: var(--color-success);
}

.wa-card-footer .btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.8rem;
}

/* Leaderboard Settings */
.leaderboard-settings {
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-lg);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.leaderboard-settings h4 {
    margin: 0 0 var(--spacing-md);
    font-size: 1rem;
    color: var(--color-text);
}

.leaderboard-setting-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) 0;
}

.leaderboard-setting-item + .leaderboard-setting-item {
    border-top: 1px solid var(--color-border);
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-md);
}

.setting-info {
    flex: 1;
}

.setting-label {
    display: block;
    font-weight: 500;
    color: var(--color-text);
}

.setting-description {
    display: block;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: 2px;
}

/* Privacy Notice */
.privacy-notice {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: #f8fafc;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
}

.privacy-notice h4 {
    margin: 0 0 var(--spacing-sm);
    font-size: 0.95rem;
    color: var(--color-text);
}

.privacy-notice p {
    margin: 0 0 var(--spacing-sm);
    color: var(--color-text-muted);
    line-height: 1.5;
}

.privacy-notice ul {
    margin: 0 0 var(--spacing-sm);
    padding-left: var(--spacing-lg);
    color: var(--color-text-muted);
}

.privacy-notice li {
    margin-bottom: var(--spacing-xs);
    line-height: 1.5;
}

.privacy-notice strong {
    color: var(--color-text);
}

.privacy-warning {
    color: var(--color-warning) !important;
    font-weight: 500;
    margin-top: var(--spacing-md) !important;
    margin-bottom: 0 !important;
}

.privacy-actions {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.instructions {
    background: #f0f9ff;
    border: 1px solid #bae6fd;
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    text-align: left;
}

.instructions p {
    margin-bottom: var(--spacing-sm);
}

.instructions ul {
    margin: 0;
    padding-left: var(--spacing-lg);
}

.instructions li {
    margin-bottom: var(--spacing-xs);
}

.session-options {
    margin-top: var(--spacing-xl);
}

.session-options h3 {
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

.saved-sessions {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.saved-sessions h4 {
    margin: 0 0 var(--spacing-md);
    font-size: 0.95rem;
    color: var(--color-text-muted);
}

.saved-sessions ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.saved-sessions li {
    display: flex;
    flex-direction: column;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
}

.saved-sessions li:hover {
    background: var(--color-surface);
}

.session-main {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.session-info {
    flex: 1;
}

.session-date {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.session-progress {
    font-size: 0.8rem;
    color: var(--color-secondary);
}

.session-actions {
    display: flex;
    gap: var(--spacing-sm);
}

/* Session preview toggle button */
.btn-preview-toggle {
    background: none;
    border: none;
    color: var(--color-primary);
    font-size: 0.75rem;
    cursor: pointer;
    padding: 2px 0;
    margin-top: 4px;
}

.btn-preview-toggle:hover {
    text-decoration: underline;
}

/* Session preview panel */
.session-preview {
    width: 100%;
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-border);
}

.session-preview-header {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.session-preview-item {
    background: var(--color-surface);
    border-radius: var(--radius-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    border-left: 3px solid var(--color-primary);
}

.session-preview-stem {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    font-style: italic;
    margin-bottom: 2px;
}

.session-preview-response {
    font-size: 0.8rem;
    color: var(--color-text);
    line-height: 1.3;
    max-height: 3.9em;
    overflow: hidden;
    text-overflow: ellipsis;
}

.session-preview-more {
    font-size: 0.7rem;
    color: var(--color-text-muted);
    font-style: italic;
    margin-top: var(--spacing-xs);
}

.settings-section {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.settings-section h4 {
    margin: 0 0 var(--spacing-md);
    font-size: 0.95rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    margin-bottom: var(--spacing-sm);
}

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

.stem-count-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.stem-count-label select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
}

/* Mode Selection */
.mode-selection {
    margin-bottom: var(--spacing-xl);
}

.mode-selection h4 {
    margin: 0 0 var(--spacing-md);
    font-size: 0.95rem;
    color: var(--color-text-muted);
}

.mode-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.mode-card {
    background: var(--color-bg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: center;
    position: relative;
}

.mode-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.mode-card.selected {
    border-color: var(--color-primary);
    background: linear-gradient(135deg, #f0f4ff 0%, #e8f0fe 100%);
}

.mode-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.mode-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.mode-desc {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    line-height: 1.4;
}

.mode-badge {
    position: absolute;
    top: -8px;
    right: -8px;
    background: var(--color-primary);
    color: white;
    font-size: 0.65rem;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 10px;
    text-transform: uppercase;
}

/* Honor Mode */
.honor-mode-section {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.honor-mode-toggle {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    cursor: pointer;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    background: var(--color-bg);
    transition: background 0.2s;
}

.honor-mode-toggle:hover {
    background: #e5e7eb;
}

.honor-mode-toggle input[type="checkbox"] {
    width: 20px;
    height: 20px;
    margin-top: 2px;
    accent-color: var(--color-primary);
}

.honor-toggle-label {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.honor-toggle-label strong {
    font-size: 1rem;
    color: var(--color-text);
}

.honor-desc {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.4;
}

.honor-name-entry {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: #f0f9ff;
    border: 1px solid #bae6fd;
    border-radius: var(--radius-md);
}

.honor-name-entry label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.honor-name-entry input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
}

.honor-name-entry input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(88, 86, 214, 0.1);
}

/* Important Notes Section (Welcome Screen) */
.important-notes {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.important-notes h4 {
    margin: 0 0 var(--spacing-md);
    color: var(--color-text);
}

.notes-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.note-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.note-item.warning {
    background: #fef3c7;
    border: 1px solid #f59e0b;
}

.note-icon {
    font-size: 1.1rem;
    flex-shrink: 0;
}

.note-item p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--color-text);
}

.note-item.warning p {
    color: #92400e;
}

/* Dark mode for welcome-specific elements */
[data-theme="dark"] .disclaimer {
    background: #1e2230;
}

[data-theme="dark"] .how-it-works {
    background: #1e2230;
}

[data-theme="dark"] .theory-section {
    background: linear-gradient(135deg, #2d2416 0%, #3d3120 100%);
}

[data-theme="dark"] .theory-link {
    background: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .theory-link:hover {
    background: rgba(255, 255, 255, 0.12);
}

[data-theme="dark"] .youtube-embed {
    background: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .youtube-embed:hover {
    background: rgba(255, 255, 255, 0.12);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

[data-theme="dark"] .unlocks-preview {
    background: linear-gradient(135deg, #1e1a3d 0%, #2a2555 100%);
}

[data-theme="dark"] .unlock-tier {
    background: rgba(255, 255, 255, 0.08);
}

[data-theme="dark"] .username-setup {
    background: linear-gradient(135deg, #0d1a2b 0%, #162a3f 100%);
    border-color: var(--color-primary);
}

[data-theme="dark"] .import-notice {
    background: linear-gradient(135deg, #0d2218 0%, #15342a 100%);
    border-color: var(--color-success);
}

[data-theme="dark"] .mode-card {
    background: var(--color-surface);
    border-color: var(--color-border);
}

[data-theme="dark"] .mode-card.selected {
    border-color: var(--color-primary);
    background: rgba(124, 122, 255, 0.08);
}

[data-theme="dark"] .important-notes {
    background: #1e2230;
}

[data-theme="dark"] .note-item {
    background: var(--color-surface);
}

[data-theme="dark"] .privacy-notice {
    background: #1e2230;
}

[data-theme="dark"] .instructions {
    background: rgba(124, 122, 255, 0.08);
    border-color: var(--color-border);
}

/* System dark mode preference fallback for welcome elements */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .disclaimer {
        background: #1e2230;
    }

    :root:not([data-theme="light"]) .how-it-works {
        background: #1e2230;
    }

    :root:not([data-theme="light"]) .theory-section {
        background: linear-gradient(135deg, #2d2416 0%, #3d3120 100%);
    }

    :root:not([data-theme="light"]) .theory-link {
        background: rgba(255, 255, 255, 0.08);
    }

    :root:not([data-theme="light"]) .theory-link:hover {
        background: rgba(255, 255, 255, 0.12);
    }

    :root:not([data-theme="light"]) .youtube-embed {
        background: rgba(255, 255, 255, 0.08);
    }

    :root:not([data-theme="light"]) .youtube-embed:hover {
        background: rgba(255, 255, 255, 0.12);
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
    }

    :root:not([data-theme="light"]) .unlocks-preview {
        background: linear-gradient(135deg, #1e1a3d 0%, #2a2555 100%);
    }

    :root:not([data-theme="light"]) .unlock-tier {
        background: rgba(255, 255, 255, 0.08);
    }

    :root:not([data-theme="light"]) .username-setup {
        background: linear-gradient(135deg, #0d1a2b 0%, #162a3f 100%);
        border-color: var(--color-primary);
    }

    :root:not([data-theme="light"]) .import-notice {
        background: linear-gradient(135deg, #0d2218 0%, #15342a 100%);
        border-color: var(--color-success);
    }

    :root:not([data-theme="light"]) .mode-card {
        background: var(--color-surface);
        border-color: var(--color-border);
    }

    :root:not([data-theme="light"]) .mode-card.selected {
        border-color: var(--color-primary);
        background: rgba(124, 122, 255, 0.08);
    }

    :root:not([data-theme="light"]) .important-notes {
        background: #1e2230;
    }

    :root:not([data-theme="light"]) .note-item {
        background: var(--color-surface);
    }

    :root:not([data-theme="light"]) .privacy-notice {
        background: #1e2230;
    }

    :root:not([data-theme="light"]) .instructions {
        background: rgba(124, 122, 255, 0.08);
        border-color: var(--color-border);
    }
}