/**
 * CO-READIT Analytics Dashboard Styles
 * Phase 7: Analytics & Insights
 */

/* Analytics Dashboard Container */
.analytics-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 24px;
}

.analytics-header {
    margin-bottom: 32px;
}

.analytics-title {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 8px 0;
}

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

/* Date Range Picker */
.date-range-picker {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

.date-range-label {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.date-range-preset {
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    background: var(--bg-primary);
    color: var(--text-secondary);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s;
}

.date-range-preset:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.date-range-preset.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.date-range-custom {
    display: flex;
    gap: 8px;
    align-items: center;
}

.date-range-input {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 14px;
    color: var(--text-primary);
    background: var(--bg-primary);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.stat-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.stat-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 12px;
}

.stat-card-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.stat-card-icon {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.stat-card-icon.blue {
    background: #e3f2fd;
    color: #1976d2;
}

.stat-card-icon.green {
    background: #e8f5e9;
    color: #388e3c;
}

.stat-card-icon.orange {
    background: #fff3e0;
    color: #f57c00;
}

.stat-card-icon.purple {
    background: #f3e5f5;
    color: #7b1fa2;
}

.stat-card-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.stat-card-change {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 13px;
}

.stat-card-change.positive {
    color: #4caf50;
}

.stat-card-change.negative {
    color: #f44336;
}

.stat-card-change-icon {
    font-size: 16px;
}

/* Chart Container */
.chart-container {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 24px;
    margin-bottom: 24px;
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.chart-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.chart-controls {
    display: flex;
    gap: 8px;
}

.chart-control-btn {
    padding: 6px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-primary);
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
}

.chart-control-btn:hover {
    background: var(--bg-hover);
}

.chart-control-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.chart-canvas {
    width: 100%;
    height: 300px;
    background: var(--bg-secondary);
    border-radius: 4px;
    padding: 20px;
}

/* Simple Bar Chart */
.simple-chart {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    height: 200px;
    gap: 8px;
    padding: 0 10px;
}

.simple-chart-bar {
    flex: 1;
    background: linear-gradient(180deg, var(--primary-color), #1976d2);
    border-radius: 4px 4px 0 0;
    position: relative;
    min-height: 4px;
    transition: all 0.3s;
    cursor: pointer;
}

.simple-chart-bar:hover {
    opacity: 0.8;
}

.simple-chart-bar-label {
    position: absolute;
    bottom: -25px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 11px;
    color: var(--text-secondary);
    white-space: nowrap;
}

.simple-chart-bar-value {
    position: absolute;
    top: -25px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 12px;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
}

/* Top Items List */
.top-items-list {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 24px;
    margin-bottom: 24px;
}

.top-items-header {
    margin-bottom: 20px;
}

.top-items-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.top-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px;
    border-radius: 6px;
    margin-bottom: 8px;
    transition: background 0.2s;
    cursor: pointer;
}

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

.top-item-rank {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-secondary);
    min-width: 30px;
    text-align: center;
}

.top-item-rank.gold {
    color: #ffa000;
}

.top-item-rank.silver {
    color: #757575;
}

.top-item-rank.bronze {
    color: #d84315;
}

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

.top-item-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.top-item-meta {
    font-size: 12px;
    color: var(--text-secondary);
}

.top-item-value {
    font-size: 16px;
    font-weight: 600;
    color: var(--primary-color);
}

/* Activity Heatmap */
.activity-heatmap {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 24px;
    margin-bottom: 24px;
    overflow-x: auto;
}

.heatmap-header {
    margin-bottom: 20px;
}

.heatmap-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.heatmap-grid {
    display: grid;
    grid-template-columns: repeat(53, 1fr);
    gap: 3px;
    min-width: 800px;
}

.heatmap-cell {
    aspect-ratio: 1;
    background: var(--bg-secondary);
    border-radius: 2px;
    cursor: pointer;
    transition: all 0.2s;
}

.heatmap-cell:hover {
    transform: scale(1.2);
    z-index: 10;
}

.heatmap-cell.level-0 {
    background: #ebedf0;
}

.heatmap-cell.level-1 {
    background: #9be9a8;
}

.heatmap-cell.level-2 {
    background: #40c463;
}

.heatmap-cell.level-3 {
    background: #30a14e;
}

.heatmap-cell.level-4 {
    background: #216e39;
}

.heatmap-legend {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 16px;
    font-size: 12px;
    color: var(--text-secondary);
}

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

/* Analytics Tabs */
.analytics-tabs {
    display: flex;
    gap: 4px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 24px;
    overflow-x: auto;
}

.analytics-tab {
    padding: 12px 20px;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

.analytics-tab:hover {
    color: var(--text-primary);
}

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

/* Growth Indicator */
.growth-indicator {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.growth-indicator.positive {
    background: #e8f5e9;
    color: #388e3c;
}

.growth-indicator.negative {
    background: #ffebee;
    color: #d32f2f;
}

.growth-indicator.neutral {
    background: var(--bg-secondary);
    color: var(--text-secondary);
}

/* Export Button */
.export-btn {
    padding: 10px 20px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.export-btn:hover {
    background: #1976d2;
    transform: translateY(-1px);
}

.export-btn svg {
    width: 16px;
    height: 16px;
}

/* Empty State */
.analytics-empty {
    text-align: center;
    padding: 60px 20px;
}

.analytics-empty-icon {
    font-size: 64px;
    opacity: 0.3;
    margin-bottom: 16px;
}

.analytics-empty-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .analytics-container {
        padding: 16px;
    }

    .analytics-title {
        font-size: 22px;
    }

    .stats-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .stat-card {
        padding: 16px;
    }

    .stat-card-value {
        font-size: 28px;
    }

    .chart-container,
    .top-items-list,
    .activity-heatmap {
        padding: 16px;
    }

    .chart-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .chart-canvas {
        height: 250px;
    }

    .date-range-picker {
        flex-direction: column;
        align-items: stretch;
    }

    .date-range-custom {
        flex-direction: column;
    }

    .analytics-tabs {
        gap: 0;
    }

    .analytics-tab {
        padding: 10px 16px;
        font-size: 13px;
    }
}