/* css/statistics-manager.css */

/* Statistics Page Styles */
.statistics-page {
    background: rgba(255, 255, 255, 0.9);
    padding: 30px;
    border-radius: var(--border-radius); /* Using CSS variable */
    box-shadow: var(--shadow-card);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-sizing: border-box;
}

.statistics-header { /* General header for review and statistics pages */
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color-light); /* Using CSS variable */
}

.statistics-header h2 {
    font-size: 1.8rem;
    color: var(--text-primary);
    margin: 0;
}

.statistics-actions { /* Action buttons container for statistics */
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.time-range-select {
    padding: 10px;
    border-radius: var(--border-radius-sm); /* Using CSS variable */
    border: 1px solid var(--border-color-light); /* Using CSS variable */
    font-size: 0.9rem;
    background: white;
    box-sizing: border-box;
}

/* Overview Statistics Section */
.overview-section {
    margin-bottom: 30px;
}

.stats-overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); /* Adjusted minwidth for more columns */
    gap: 15px; /* Adjusted gap */
    margin-bottom: 20px;
}

.stat-card {
    background: white;
    border-radius: var(--border-radius-md); /* Using CSS variable */
    padding: 16px; /* Adjusted padding */
    box-shadow: 0 4px 15px rgba(0,0,0,0.07);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 8px; /* Adjusted gap */
    border: 1px solid var(--border-color-light); /* Using CSS variable */
    min-width: 0;
    overflow: hidden;
    min-height: 110px; /* Adjusted min-height */
    box-sizing: border-box;
    transition: var(--transition); /* Add transition for trend indicators */
}

/* Trend indicators (for overall accuracy) */
.stat-card.trend-up { border-bottom: 4px solid var(--success-color); }
.stat-card.trend-down { border-bottom: 4px solid var(--error-color); }
.stat-card.trend-neutral { border-bottom: 4px solid var(--primary-color); }


.stat-icon {
    font-size: 1.8rem; /* Adjusted font size */
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(102, 126, 234, 0.1);
    color: var(--primary-color);
    flex-shrink: 0;
    margin-bottom: 5px;
}

.stat-content {
    flex: 1;
    min-width: 0;
    overflow: visible;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

.stat-content .stat-value {
    font-size: 1.4rem; /* Adjusted font size */
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.2;
    word-break: break-word;
    white-space: normal;
    overflow: visible;
    text-overflow: clip;
    margin-bottom: 2px;
}

.stat-content .stat-label {
    font-size: 0.85rem; /* Adjusted font size */
    color: var(--text-muted);
    line-height: 1.2;
    white-space: normal;
    overflow: visible;
    text-overflow: clip;
    word-break: break-word;
}
.stat-explanation { /* Specific for accuracy card explanation */
    font-size: 0.7em;
    color: var(--text-muted);
    margin-top: 3px;
}


/* Charts Section */
.charts-section {
    margin-bottom: 30px;
}

.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); /* Adjusted minwidth */
    gap: 20px;
}

.chart-container {
    background: white;
    border-radius: var(--border-radius-md); /* Using CSS variable */
    padding: 15px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.07);
    border: 1px solid var(--border-color-light); /* Using CSS variable */
    overflow: hidden;
    position: relative;
    height: 300px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: stretch;
    box-sizing: border-box;
}

.chart-container canvas {
    flex-grow: 1; /* Allow canvas to take available space */
}

.chart-container.wide {
    grid-column: 1 / -1; /* Span full width */
}

/* Custom chart title for non-Chart.js (e.g., calendar heatmap) */
.chart-title-custom {
    font-size: 1.1em;
    font-weight: 500;
    color: var(--text-primary);
    text-align: center;
    padding: 5px 0 10px 0;
    margin: 0;
    flex-shrink: 0;
}

/* Calendar Heatmap specific styles (from original styles.css) */
.calendar-heatmap-wrapper { /* Now direct target for #calendarChart */
    width: 100%;
    height: 100%; /* Fill parent container */
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.calendar-grid{
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(14px, 1fr));
    grid-auto-rows: 14px;
    gap: 3px;
    padding: 5px;
    flex-grow: 1;
    overflow-y: auto;
    align-content: flex-start;
}
.calendar-day{
    border-radius: 3px;
    background-color: rgba(0, 0, 0, 0.06);
    transition: background-color 0.3s;
    cursor: pointer;
    aspect-ratio: 1 / 1;
}

.calendar-day:hover {
    outline: 1px solid var(--primary-color);
}

/* Chart.js general styling (if needed outside of Chart.js options) */
.chart-container .no-data {
    text-align: center;
    padding: 20px;
    color: var(--text-muted);
    font-style: italic;
    margin: auto; /* Center in flex container */
    width: 100%;
}
.chart-message { /* Added from QuizEngine's _showChartMessage */
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 15px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9em;
    z-index: 10;
}
.chart-message.chart-message-error {
    color: var(--error-color);
}


/* Achievements Section */
.achievements-section {
    margin-top: 30px;
}

.achievements-list-container { /* New achievements list container (two-column) */
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); /* Use auto-fit for responsiveness */
    gap: 15px;
    margin-top: 20px;
}

.achievement-item {
    display: flex;
    background: var(--bg-card);
    border: 1px solid var(--border-color-light); /* Using CSS variable */
    border-radius: var(--border-radius-sm);
    padding: 12px 15px;
    transition: var(--transition);
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
    box-sizing: border-box;
}

.achievement-item.locked {
    background-color: #f9fafb;
    opacity: 0.85;
}

.achievement-item.unlocked {
    background-color: rgba(var(--success-rgb), 0.1);
    border-color: rgba(var(--success-rgb), 0.4);
}

.achievement-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.07);
}

.achievement-item-icon {
    font-size: 1.8rem;
    margin-right: 15px;
    flex-shrink: 0;
    width: 35px;
    text-align: center;
    align-self: flex-start;
    padding-top: 2px;
}

.achievement-item-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.achievement-item-name {
    font-size: 1em;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}
.achievement-item.locked .achievement-item-name {
    color: var(--text-secondary);
}

.achievement-item-description {
    font-size: 0.8em;
    color: var(--text-muted);
    margin: 0;
    line-height: 1.4;
    flex-grow: 1;
}

/* Progress Bar for individual achievements */
.achievement-item-progress-bar {
    width: 100%;
    height: 6px;
    background-color: #e0e7ff;
    border-radius: 3px;
    overflow: hidden;
    margin-top: 4px;
}

.achievement-item-progress-fill {
    height: 100%;
    background-color: var(--primary-color);
    border-radius: 3px;
    transition: width 0.3s ease-out;
}

.achievement-item-progress-text {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 2px;
}
.achievement-item-progress-text.done {
    color: var(--success-color);
    font-weight: 500;
    font-size: 0.75em;
}

/* Overall achievements header */
.achievements-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color-light); /* Using CSS variable */
}

.achievements-header h3 {
    margin: 0;
    font-size: 1.4em;
    color: var(--text-primary);
}

.achievements-progress {
    display: flex;
    align-items: center;
    gap: 10px;
}

.achievements-progress .progress-bar {
    width: 150px;
    height: 10px;
    background-color: #e9ecef;
    border-radius: 5px;
    overflow: hidden;
}

.achievements-progress .progress-fill {
    height: 100%;
    background-color: var(--primary-color);
    border-radius: 5px;
    transition: width 0.5s ease;
}

.achievements-progress .progress-text {
    font-size: 0.9em;
    font-weight: 500;
    color: var(--text-secondary);
}

/* Responsive adjustments for statistics manager */
@media (max-width: 1200px) {
    .stats-overview {
        grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
        gap: 12px;
    }
    .stat-card {
        padding: 14px;
        gap: 6px;
        min-height: 100px;
    }
    .stat-icon {
        width: 45px; height: 45px; font-size: 1.6rem;
    }
    .stat-content .stat-value { font-size: 1.3rem; }
    .stat-content .stat-label { font-size: 0.8rem; }

    .charts-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 15px;
    }
    .chart-container {
        height: 280px;
    }
    .achievements-list-container {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 12px;
    }
}

@media (max-width: 768px) {
    .statistics-page { padding: 20px; }
    .statistics-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
    }
    .statistics-header h2 { font-size: 1.5rem; }
    .statistics-actions { width: 100%; justify-content: space-between; }
    .time-range-select { flex-grow: 1; }
    .action-btn { flex-grow: 1; justify-content: center; padding: 8px 15px; font-size: 0.85rem; }

    .stats-overview {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
    .stat-card {
        padding: 12px;
        gap: 5px;
        min-height: 90px;
    }
    .stat-icon {
        width: 40px; height: 40px; font-size: 1.4rem;
    }
    .stat-content .stat-value { font-size: 1.2rem; }
    .stat-content .stat-label { font-size: 0.75rem; }

    .charts-grid {
        grid-template-columns: 1fr; /* Single column on mobile */
        gap: 15px;
    }
    .chart-container {
        height: 250px;
        padding: 10px;
    }
    .calendar-grid {
        grid-template-columns: repeat(auto-fit, minmax(12px, 1fr));
        grid-auto-rows: 12px;
        gap: 2px;
    }
    .achievements-list-container {
        grid-template-columns: 1fr; /* Single column on mobile */
        gap: 12px;
    }
    .achievement-item {
        padding: 10px 12px;
    }
    .achievement-item-icon {
        font-size: 1.6rem;
        margin-right: 12px;
        width: 30px;
    }
    .achievement-item-name { font-size: 0.95em; }
    .achievement-item-description { font-size: 0.75em; }
    .achievement-item-progress-bar { max-width: 150px; }
    .achievements-header h3 { font-size: 1.3em; }
    .achievements-progress .progress-bar { width: 120px; }
    .achievements-progress .progress-text { font-size: 0.8em; }
}

@media (max-width: 480px) {
    .statistics-page { padding: 15px; }
    .statistics-header h2 { font-size: 1.3rem; }
    .stats-overview {
        grid-template-columns: 1fr; /* Single column on very small screens */
        gap: 8px;
    }
    .stat-card {
        padding: 10px;
        gap: 4px;
        min-height: 80px;
    }
    .stat-icon {
        width: 35px; height: 35px; font-size: 1.2rem;
    }
    .stat-content .stat-value { font-size: 1.1rem; }
    .stat-content .stat-label { font-size: 0.7rem; }

    .charts-grid { gap: 10px; }
    .chart-container { height: 200px; padding: 8px; }

    .achievements-list-container { gap: 10px; }
    .achievement-item { padding: 8px 10px; }
    .achievement-item-icon { font-size: 1.4rem; margin-right: 10px; width: 25px; }
    .achievement-item-name { font-size: 0.9em; }
    .achievement-item-description { font-size: 0.7em; }
    .achievement-item-progress-bar { height: 5px; }
    .achievement-item-progress-text { font-size: 0.65rem; }
    .achievements-header h3 { font-size: 1.2em; }
    .achievements-progress .progress-bar { width: 100px; height: 8px; }
    .achievements-progress .progress-text { font-size: 0.7em; }
}