/* ========================================
   Analytics Section
   ======================================== */

#section-analytics {
    display: none;
    padding: 2rem;
    overflow-y: auto;
    background: var(--bg-primary);
}

#section-analytics.active-section {
    display: flex;
    flex-direction: column;
    flex: 1;
}

.analytics-header {
    text-align: center;
    margin-bottom: 2rem;
}

.analytics-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

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

.analytics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.analytics-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    transition: all var(--transition);
}

.analytics-card:hover {
    border-color: var(--text-muted);
}

.analytics-card h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.card-description {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.complexity-card {
    grid-column: span 1;
}

.complexity-chart {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
    height: 250px;
    position: relative;
}

.complexity-chart canvas {
    width: 100% !important;
    height: 100% !important;
}

.complexity-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    font-size: 0.75rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--text-secondary);
}

.legend-color {
    width: 12px;
    height: 12px;
    border-radius: 2px;
}

.benchmark-chart-card {
    grid-column: span 1;
}

.benchmark-chart {
    height: 200px;
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 0.5rem;
}

.benchmark-chart canvas {
    width: 100% !important;
    height: 100% !important;
}

.chart-note {
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.info-card {
    grid-column: span 1;
}

.algo-selector {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.algo-selector label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.algo-info-content {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 1.25rem;
}

.algo-info-content .info-row {
    display: flex;
    justify-content: space-between;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.algo-info-content .info-row:last-child {
    border-bottom: none;
}

.algo-info-content .info-label {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.algo-info-content .info-value {
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.85rem;
    font-family: 'SF Mono', 'Consolas', monospace;
}

.algo-info-content .algo-description {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.stats-card {
    grid-column: span 1;
}

.session-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-item {
    background: var(--bg-tertiary);
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
}

.stat-label {
    display: block;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
}

.stat-value {
    display: block;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    font-family: 'SF Mono', 'Consolas', monospace;
}

.export-card {
    grid-column: span 1;
}

.export-options {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.export-options .btn {
    flex: 1;
}

.export-note {
    text-align: center;
    color: var(--text-muted);
}

.export-note small {
    font-size: 0.75rem;
}

.complexity-chart,
.benchmark-chart {
    width: 100%;
    min-height: 200px;
    aspect-ratio: 16 / 9;
}

/* ─── Usage Pie Chart ─── */
.usage-chart-card {
    grid-column: span 1;
}

.usage-chart {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 1rem;
    height: 200px;
    position: relative;
}

.usage-chart canvas {
    width: 100% !important;
    height: 100% !important;
}

/* ─── Performance Trend Chart ─── */
.trend-chart-card {
    grid-column: span 1;
}

.trend-chart {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 1rem;
    height: 200px;
    position: relative;
}

.trend-chart canvas {
    width: 100% !important;
    height: 100% !important;
}

/* ─── Sort History Timeline ─── */
.analytics-timeline-wrap {
    max-height: 320px;
    overflow-y: auto;
    padding-right: 0.5rem;
}

.analytics-timeline-wrap::-webkit-scrollbar {
    width: 4px;
}

.analytics-timeline-wrap::-webkit-scrollbar-track {
    background: transparent;
}

.analytics-timeline-wrap::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 2px;
}

.timeline-entry {
    display: flex;
    gap: 0.75rem;
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--border-color);
    transition: background 0.15s ease;
}

.timeline-entry:last-child {
    border-bottom: none;
}

.timeline-entry:hover {
    background: var(--bg-tertiary);
    border-radius: 6px;
    padding-left: 0.5rem;
    margin-left: -0.5rem;
}

.timeline-dot {
    width: 8px;
    height: 8px;
    min-width: 8px;
    background: var(--primary-color, #4a90d9);
    border-radius: 50%;
    margin-top: 0.4rem;
}

.timeline-content {
    flex: 1;
    min-width: 0;
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.25rem;
}

.timeline-algo {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--text-primary);
}

.timeline-time {
    font-size: 0.7rem;
    color: var(--text-muted);
    flex-shrink: 0;
}

.timeline-stats {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.timeline-stats span {
    font-size: 0.73rem;
    color: var(--text-secondary);
    font-family: 'SF Mono', 'Consolas', monospace;
}

.timeline-empty {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ─── Personal Bests ─── */
.bests-card {
    grid-column: span 1;
}

.bests-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.best-card {
    background: var(--bg-tertiary);
    padding: 0.75rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: border-color 0.2s ease;
}

.best-card:hover {
    border-color: var(--primary-color, #4a90d9);
}

.best-algo {
    font-weight: 600;
    font-size: 0.8rem;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.best-metric {
    font-size: 1.1rem;
    font-weight: 700;
    color: #2ecc71;
    font-family: 'SF Mono', 'Consolas', monospace;
}

.best-details {
    font-size: 0.7rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.best-when {
    font-size: 0.65rem;
    color: var(--text-muted);
    margin-top: 0.15rem;
}

.bests-empty {
    text-align: center;
    padding: 1.5rem;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ─── Recommendation Card ─── */
.recommendation-card {
    grid-column: span 1;
}

.rec-card {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 1.25rem;
    border: 1px solid var(--border-color);
}

.rec-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.rec-badge {
    background: rgba(46, 204, 113, 0.15);
    color: #2ecc71;
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border: 1px solid rgba(46, 204, 113, 0.3);
}

.rec-algo {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--text-primary);
}

.rec-reason {
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 0.75rem;
}

.rec-alts-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.rec-alts {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.rec-alt {
    display: flex;
    gap: 0.5rem;
    align-items: baseline;
    font-size: 0.78rem;
}

.rec-alt-name {
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
}

.rec-alt-reason {
    color: var(--text-muted);
}

.rec-empty {
    text-align: center;
    padding: 1.5rem;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ─── Toast Action Buttons ─── */
.toast-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.toast-action-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: inherit;
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: background 0.15s ease;
}

.toast-action-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.toast-action-primary {
    background: var(--primary-color, #4a90d9);
    border-color: transparent;
    color: #fff;
}

.toast-action-primary:hover {
    filter: brightness(1.15);
}

.toast-count {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.15);
    color: inherit;
    font-size: 0.65rem;
    font-weight: 700;
    padding: 0.1rem 0.4rem;
    border-radius: 10px;
    margin-left: 0.25rem;
}

.toast-pin {
    position: absolute;
    top: 0.35rem;
    left: 0.35rem;
    font-size: 0.6rem;
    opacity: 0.5;
}