/* ===================================
   Reading Stats Page
   =================================== */

.reading-stats-page {
    padding-bottom: var(--space-8);
}

.reading-stats-header {
    margin-bottom: var(--space-6);
}

.reading-stats-header h1 {
    font-size: var(--heading);
    font-weight: var(--weight-bold);
    letter-spacing: var(--tracking-tight);
    margin-bottom: var(--space-1);
}

.reading-stats-header p {
    color: var(--text-muted);
    font-size: var(--body);
}

/* --- Enhanced stat cards --- */
.stat-card {
    position: relative;
    overflow: hidden;
    border-top: 2px solid var(--stat-accent, var(--accent-primary));
    transition: transform var(--transition), box-shadow var(--transition);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.stat-card::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--stat-accent, var(--accent-primary)) 0%, transparent 70%);
    opacity: 0.04;
    pointer-events: none;
}

.stat-value {
    position: relative;
    z-index: 1;
}

/* Stats overview wrapper — groups both grids with a period divider */
.stats-overview {
    margin-bottom: var(--space-8);
}

.stats-section-divider {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin: var(--space-6) 0 var(--space-4);
}

.stats-section-divider::before,
.stats-section-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}

.stats-period-badge {
    font-size: var(--xs);
    font-weight: var(--weight-semibold);
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    white-space: nowrap;
    padding: 0 var(--space-2);
}

/* Streak glow — signature element: pulse when active */
.streak-active {
    box-shadow: 0 0 0 0 rgba(200, 155, 60, 0.3);
    animation: streak-pulse 2s ease-in-out 0.5s 3;
}

.streak-active:hover {
    box-shadow: 0 0 20px rgba(200, 155, 60, 0.2);
}

@keyframes streak-pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(200, 155, 60, 0.1); }
    50% { box-shadow: 0 0 16px 4px rgba(200, 155, 60, 0.2); }
}

@media (prefers-reduced-motion: reduce) {
    .streak-active {
        animation: none;
        box-shadow: 0 0 8px rgba(200, 155, 60, 0.15);
    }
}

/* Velocity stat cards — smaller variant */
.stats-grid-velocity .stat-card {
    padding: var(--space-3) var(--space-4);
}

.stats-grid-velocity .stat-value {
    font-size: var(--title);
}

.stats-grid-velocity .stat-label {
    font-size: var(--xs);
}

/* --- Heatmap --- */
.heatmap-container {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: var(--space-2);
}

.heatmap-grid {
    display: flex;
    flex-direction: column;
    gap: 3px;
    align-items: flex-start;
}

.heatmap-grid .flex-row {
    flex-shrink: 0;
}

.heatmap-month-labels {
    padding-left: 32px;
    font-size: 0.6rem;
    color: var(--text-dim);
}

.heatmap-month-label {
    font-weight: 500;
    white-space: nowrap;
}

.heatmap-row {
    flex-shrink: 0;
}

.heatmap-day-label {
    width: 28px;
    font-size: 0.55rem;
    color: var(--text-dim);
    text-align: right;
    padding-right: 4px;
    flex-shrink: 0;
    line-height: 12px;
}

.heatmap-cell {
    width: 12px;
    height: 12px;
    border-radius: 2px;
    flex-shrink: 0;
    cursor: pointer;
    background: var(--surface-bg);
    transition: transform var(--transition), opacity var(--transition);
}

.heatmap-cell:hover {
    transform: scale(1.5);
    z-index: 2;
    opacity: 0.9;
}

.heatmap-cell.level-0 { background: var(--surface-bg); }
.heatmap-cell.level-1 { background: rgba(79, 143, 224, 0.12); }
.heatmap-cell.level-2 { background: rgba(79, 143, 224, 0.28); }
.heatmap-cell.level-3 { background: rgba(79, 143, 224, 0.5); }
.heatmap-cell.level-4 { background: var(--accent-primary); }

/* Today highlight — ring around today's cell */
.heatmap-cell.today {
    outline: 2px solid var(--accent-primary);
    outline-offset: 1px;
    animation: today-highlight 2s ease-in-out 0.3s 2;
}

@keyframes today-highlight {
    0%, 100% { outline-color: var(--accent-primary); }
    50% { outline-color: transparent; }
}

@media (prefers-reduced-motion: reduce) {
    .heatmap-cell.today {
        animation: none;
        outline: 2px solid var(--accent-primary);
    }
}

.heatmap-empty-cell {
    width: 12px;
    height: 12px;
    flex-shrink: 0;
}

.heatmap-legend {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 4px;
    margin-top: var(--space-2);
    font-size: 0.65rem;
    color: var(--text-dim);
    justify-content: flex-end;
}

/* --- Chart cards --- */
.chart-card canvas {
    max-height: 220px;
}

.chart-card .chart-wrap {
    background: transparent;
    border: none;
    padding: 0;
    margin: 0;
}

/* --- Period links (pill style) --- */
.period-link {
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--caption);
    font-weight: var(--weight-semibold);
    color: var(--text-muted);
    border: 1px solid var(--border);
    transition: all var(--transition);
    text-decoration: none;
    letter-spacing: 0.02em;
}

.period-link:hover {
    color: var(--text-primary);
    border-color: var(--border-hover);
    background: var(--surface-bg-hover);
}

.period-link.active {
    color: var(--accent-primary);
    border-color: var(--accent-primary);
    background: var(--accent-primary-subtle);
}

/* --- Ranked lists --- */
.rank-list {
    display: flex;
    flex-direction: column;
}

.rank-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    transition: background var(--transition);
    border-bottom: 1px solid var(--border);
}

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

.rank-item:hover {
    background: var(--surface-bg-hover);
}

.rank-number {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    font-size: var(--xs);
    font-weight: var(--weight-bold);
    color: var(--text-muted);
    background: var(--surface-bg);
    flex-shrink: 0;
}

.rank-item:nth-child(1) .rank-number {
    background: var(--accent-gold-subtle);
    color: var(--accent-gold);
}

.rank-item:nth-child(2) .rank-number {
    background: var(--surface-bg);
    color: var(--text-secondary);
}

.rank-item:nth-child(3) .rank-number {
    background: var(--accent-violet-subtle);
    color: var(--accent-violet);
}

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

.rank-item-title {
    font-size: var(--body);
    font-weight: var(--weight-medium);
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.rank-item-sub {
    font-size: var(--caption);
    color: var(--text-dim);
}

.rank-item-value {
    font-size: var(--caption);
    font-weight: var(--weight-semibold);
    color: var(--text-muted);
    white-space: nowrap;
    flex-shrink: 0;
}

/* --- Wrapped teaser --- */
.wrapped-teaser {
    background: linear-gradient(135deg, var(--bg-card) 0%, rgba(79, 143, 224, 0.04) 50%, rgba(124, 92, 191, 0.04) 100%);
    border: 1px solid rgba(79, 143, 224, 0.12);
    position: relative;
    overflow: hidden;
}

.wrapped-teaser::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(79, 143, 224, 0.06) 0%, transparent 70%);
    pointer-events: none;
}

.wrapped-teaser-content {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
    align-items: center;
    position: relative;
    z-index: 1;
}

.wrapped-teaser-text {
    flex: 1;
    min-width: 200px;
}

.wrapped-teaser-text p {
    margin-bottom: var(--space-1);
    font-size: var(--body);
    color: var(--text-secondary);
}

.wrapped-teaser-text strong {
    color: var(--text-primary);
    font-weight: var(--weight-semibold);
}

.btn-wrapped {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-5);
    font-size: var(--body);
    font-weight: var(--weight-semibold);
    color: #fff;
    background: var(--gradient-brand);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn-wrapped:hover {
    box-shadow: var(--glow-brand);
    transform: translateY(-1px);
}

/* --- Reading stats grid spacing --- */
.reading-stats-page .dashboard-bottom-grid {
    margin-top: var(--space-4);
}

/* --- Empty state --- */
.reading-stats-empty {
    text-align: center;
    padding: var(--space-10);
}

.reading-stats-empty p {
    color: var(--text-muted);
    margin-top: var(--space-2);
}

/* --- Library page stat overrides --- */
.library-page .stat-card {
    border-top: none;
}

.library-page .stat-card::before {
    height: 3px;
}

.library-page .stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.library-stats {
    margin-bottom: var(--space-6);
}

.library-stats-header {
    margin-bottom: var(--space-4);
}

.library-stats-header h2 {
    font-size: var(--heading);
    font-weight: var(--weight-bold);
    letter-spacing: var(--tracking-tight);
    margin-bottom: var(--space-1);
}

.library-stats-header p {
    color: var(--text-muted);
    font-size: var(--body);
}

.library-page .stats-grid {
    gap: var(--space-4);
    grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
}

/* --- Responsive --- */
@media (max-width: 600px) {
    .stats-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    }

    .stats-grid-velocity {
        grid-template-columns: repeat(2, 1fr);
    }

    .heatmap-cell {
        width: 10px;
        height: 10px;
    }

    .heatmap-empty-cell {
        width: 10px;
        height: 10px;
    }

    .heatmap-day-label {
        width: 24px;
        font-size: 0.5rem;
    }

    .heatmap-month-labels {
        padding-left: 24px;
        font-size: 0.55rem;
    }

    .chart-card canvas {
        max-height: 180px;
    }

    .stats-section-divider {
        margin: var(--space-4) 0 var(--space-3);
    }

    .library-page .stats-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: var(--space-3);
    }

    .library-stats {
        margin-bottom: var(--space-4);
    }

    .wrapped-teaser-content {
        flex-direction: column;
        text-align: center;
    }
}