/* LangLearn Web - Dark Theme */

:root {
    /* Colors - matching iOS Theme.swift */
    --bg-primary: #000000;
    --bg-secondary: #1c1c1e;
    --bg-tertiary: #2c2c2e;
    --bg-card: #1c1c1e;

    --text-primary: #ffffff;
    --text-secondary: #8e8e93;
    --text-tertiary: #636366;

    --accent: #22C55E;
    --accent-light: rgba(34, 197, 94, 0.15);

    /* Level colors */
    --level-a1: #22C55E;
    --level-a2: #14B8A6;
    --level-b1: #3B82F6;
    --level-b2: #6366F1;
    --level-c1: #A855F7;
    --level-c2: #EC4899;

    /* Rating colors */
    --rating-again: #EF4444;
    --rating-hard: #F59E0B;
    --rating-good: #22C55E;
    --rating-easy: #3B82F6;

    /* Spacing */
    --space-xs: 8px;
    --space-sm: 12px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;

    /* Border radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;

    /* Fonts */
    --font-sans: -apple-system, BlinkMacSystemFont, 'SF Pro Rounded', 'Segoe UI', Roboto, sans-serif;
}

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

html, body {
    height: 100%;
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
}

#app {
    height: 100%;
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
}

/* Views */
.view {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: var(--space-md);
}

.view.hidden {
    display: none;
}

/* Generic hidden class for any element */
.hidden {
    display: none !important;
}

/* Loading */
#loading {
    justify-content: center;
    align-items: center;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--bg-tertiary);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Top Bar */
.top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm) 0;
    margin-bottom: var(--space-md);
}

.stats-summary {
    display: flex;
    gap: var(--space-md);
}

.stat-item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-sm);
    background: var(--bg-card);
    border-radius: var(--radius-sm);
    font-weight: 600;
}

.stat-item.small {
    font-size: 14px;
}

.stat-item.accent {
    background: var(--accent-light);
    color: var(--accent);
}

.stat-icon {
    font-size: 14px;
}

.icon-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.icon-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

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

/* Level Selection */
.level-grid {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.level-grid h1 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: var(--space-lg);
}

#levels {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.level-card {
    display: flex;
    align-items: center;
    padding: var(--space-md);
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.2s;
    border: 2px solid transparent;
}

.level-card:hover:not(.locked) {
    background: var(--bg-tertiary);
}

.level-card:active:not(.locked) {
    transform: scale(0.98);
}

.level-card.locked {
    opacity: 0.5;
    cursor: not-allowed;
}

.level-badge {
    font-size: 18px;
    font-weight: 700;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    min-width: 48px;
    text-align: center;
}

.level-badge.A1 { background: var(--level-a1); color: white; }
.level-badge.A2 { background: var(--level-a2); color: white; }
.level-badge.B1 { background: var(--level-b1); color: white; }
.level-badge.B2 { background: var(--level-b2); color: white; }
.level-badge.C1 { background: var(--level-c1); color: white; }
.level-badge.C2 { background: var(--level-c2); color: white; }

.level-info {
    flex: 1;
    margin-left: var(--space-md);
}

.level-info .count {
    font-size: 16px;
    font-weight: 600;
}

.level-info .progress {
    font-size: 14px;
    color: var(--text-secondary);
}

.level-progress-bar {
    width: 60px;
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: 2px;
    overflow: hidden;
}

.level-progress-bar .fill {
    height: 100%;
    background: var(--accent);
    transition: width 0.3s;
}

/* Practice View */
.practice-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm) 0;
}

.session-info {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.session-stats {
    display: flex;
    gap: var(--space-sm);
}

.card-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg) 0;
}

.card {
    width: 100%;
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card-content {
    padding: var(--space-xl);
    text-align: center;
}

.question {
    font-size: 26px;
    font-weight: 500;
    line-height: 1.4;
}

.divider {
    height: 1px;
    background: var(--bg-tertiary);
    margin: var(--space-lg) var(--space-xl);
}

.answer {
    font-size: 30px;
    font-weight: 700;
    color: var(--accent);
    line-height: 1.4;
    margin-bottom: var(--space-md);
}

.audio-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: var(--accent-light);
    border: none;
    border-radius: 50%;
    color: var(--accent);
    cursor: pointer;
    transition: all 0.2s;
}

.audio-btn:hover {
    background: var(--accent);
    color: white;
}

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

.alternatives {
    margin-top: var(--space-lg);
    padding-top: var(--space-sm);
}

.alternatives p {
    font-size: 14px;
    color: var(--text-tertiary);
    margin-bottom: var(--space-xs);
}

.alternatives span {
    font-size: 16px;
    color: var(--text-secondary);
}

/* Card Actions */
.card-actions {
    padding: var(--space-lg) 0;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md) var(--space-lg);
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 17px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn.primary {
    background: linear-gradient(135deg, var(--accent), #16A34A);
    color: white;
}

.btn.primary:hover {
    filter: brightness(1.1);
}

.btn.primary:active {
    transform: scale(0.98);
}

.btn.large {
    width: 100%;
    padding: var(--space-md);
}

.rating-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-sm);
}

.rating-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-md);
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s;
}

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

.rating-label {
    font-size: 14px;
    font-weight: 600;
}

.rating-btn.again {
    background: rgba(239, 68, 68, 0.15);
    color: var(--rating-again);
}

.rating-btn.hard {
    background: rgba(245, 158, 11, 0.15);
    color: var(--rating-hard);
}

.rating-btn.good {
    background: rgba(34, 197, 94, 0.15);
    color: var(--rating-good);
}

.rating-btn.easy {
    background: rgba(59, 130, 246, 0.15);
    color: var(--rating-easy);
}

.rating-btn.again:hover { background: rgba(239, 68, 68, 0.25); }
.rating-btn.hard:hover { background: rgba(245, 158, 11, 0.25); }
.rating-btn.good:hover { background: rgba(34, 197, 94, 0.25); }
.rating-btn.easy:hover { background: rgba(59, 130, 246, 0.25); }

/* Stats View */
.stats-content {
    flex: 1;
    overflow-y: auto;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
}

.stat-card {
    background: var(--bg-card);
    padding: var(--space-md);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

.stat-big {
    font-size: 24px;
    font-weight: 700;
}

.heatmap-section h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.heatmap {
    display: grid;
    grid-template-columns: repeat(13, 1fr);
    gap: 3px;
}

.heatmap-cell {
    aspect-ratio: 1;
    border-radius: 3px;
    background: var(--bg-tertiary);
}

.heatmap-cell.level-1 { background: rgba(34, 197, 94, 0.25); }
.heatmap-cell.level-2 { background: rgba(34, 197, 94, 0.50); }
.heatmap-cell.level-3 { background: rgba(34, 197, 94, 0.75); }
.heatmap-cell.level-4 { background: var(--accent); }

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
    z-index: 100;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--bg-secondary);
    padding: var(--space-xl);
    border-radius: var(--radius-xl);
    text-align: center;
    max-width: 400px;
    width: 100%;
}

.modal-content h2 {
    font-size: 24px;
    margin-bottom: var(--space-lg);
}

.summary-stats {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.summary-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--bg-tertiary);
}

.summary-label {
    color: var(--text-secondary);
}

.summary-value {
    font-size: 20px;
    font-weight: 600;
}

.summary-value.accent {
    color: var(--accent);
}

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

.card {
    animation: fadeIn 0.3s ease-out;
}

/* Responsive */
@media (max-width: 400px) {
    .question { font-size: 22px; }
    .answer { font-size: 26px; }
    .rating-label { font-size: 12px; }
    .stats-grid { grid-template-columns: 1fr; }
}

/* Instruction text */
.instruction {
    font-size: 15px;
    color: var(--text-tertiary);
    margin-top: var(--space-md);
}

/* Answer row */
.answer-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
}

/* Record Button */
.record-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100px;
    height: 100px;
    border: none;
    border-radius: 50%;
    background: var(--accent);
    color: white;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 4px 20px rgba(34, 197, 94, 0.4);
    margin: var(--space-md) auto;
}

.record-btn:hover {
    transform: scale(1.05);
}

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

.record-btn.recording {
    background: #EF4444;
    box-shadow: 0 4px 20px rgba(239, 68, 68, 0.4);
    animation: pulse-recording 1s ease-in-out infinite;
}

@keyframes pulse-recording {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

.record-icon {
    font-size: 32px;
}

.record-text {
    font-size: 14px;
    font-weight: 600;
    margin-top: 4px;
}

.record-duration {
    font-size: 12px;
    opacity: 0.8;
    font-variant-numeric: tabular-nums;
}

/* Attempt Indicator */
.attempt-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    margin-bottom: var(--space-md);
}

.attempt-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--bg-tertiary);
}

.attempt-dot.used {
    background: #F59E0B;
}

.attempt-text {
    font-size: 12px;
    color: var(--text-tertiary);
    margin-left: var(--space-xs);
}

/* Assessing Spinner */
.assessing-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-lg);
}

.assessing-spinner .spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--bg-tertiary);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.assessing-spinner span {
    font-size: 14px;
    color: var(--text-secondary);
}

/* Feedback Section */
.feedback-section {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--space-md);
    margin-top: var(--space-md);
}

.feedback-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
}

.feedback-score {
    font-size: 20px;
    font-weight: 700;
}

.feedback-score.pass {
    color: var(--accent);
}

.feedback-score.fail {
    color: #F59E0B;
}

.feedback-label {
    font-size: 14px;
    color: var(--text-secondary);
}

.phoneme-comparison {
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    padding: var(--space-sm);
}

.phoneme-row {
    display: flex;
    gap: var(--space-sm);
    padding: 4px 0;
}

.phoneme-label {
    font-size: 12px;
    color: var(--text-tertiary);
    min-width: 70px;
}

.phoneme-text {
    font-family: monospace;
    font-size: 14px;
}

.phoneme-text.expected {
    color: var(--accent);
}

.phoneme-text.actual {
    color: #F59E0B;
}

/* Success Overlay */
.success-overlay {
    position: absolute;
    inset: 0;
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl);
    animation: fadeIn 0.3s ease-out;
}

.success-content {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
}

.success-icon {
    width: 32px;
    height: 32px;
    background: var(--accent);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: bold;
}

.success-score {
    font-size: 24px;
    font-weight: 700;
    color: var(--accent);
}

.success-points {
    font-size: 18px;
    font-weight: 600;
    color: var(--accent);
}

.success-answer-row {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

/* Error Message */
.error-message {
    color: #EF4444;
    font-size: 14px;
    text-align: center;
    padding: var(--space-sm);
}

/* Secondary Button */
.btn.secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    width: 100%;
    margin-top: var(--space-sm);
}

.btn.secondary:hover {
    background: var(--bg-tertiary);
}

.btn.secondary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Next Button (link style) */
.btn-link {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 0.9rem;
    cursor: pointer;
    padding: var(--space-sm) var(--space-md);
    margin-top: var(--space-xs);
}

.btn-link:hover {
    color: var(--text-primary);
}

/* Card content relative for overlay */
.card-content {
    position: relative;
}

/* Safe area for mobile */
@supports (padding-top: env(safe-area-inset-top)) {
    .view {
        padding-top: calc(var(--space-md) + env(safe-area-inset-top));
        padding-bottom: calc(var(--space-md) + env(safe-area-inset-bottom));
    }
}