/* --- Activity Calendar --- */
#activity-calendar-container {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

#activity-calendar-container h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-color);
    text-align: center;
    font-weight: 600;
}

.calendar-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm) 0;
}

.calendar-controls button {
    padding: var(--spacing-xs) var(--spacing-sm);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    background-color: var(--button-secondary-bg);
    color: var(--button-secondary-text);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    box-shadow: var(--shadow-sm);
    transition: all 0.2s ease;
}

.calendar-controls button:hover {
    background-color: var(--button-secondary-hover-bg);
    color: var(--button-secondary-hover-text);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.calendar-controls #current-month-display {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-color);
    min-width: 140px;
    text-align: center;
}

#activity-calendar {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 3px;
    padding: var(--spacing-md);
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    max-width: 100%;
    max-height: none;
}

#activity-calendar .day-cell {
    aspect-ratio: 1 / 1;
    min-width: 32px;
    min-height: 32px;
    background-color: var(--calendar-inactive-bg, #eef0f2);
    border-radius: 4px;
    cursor: default;
    transition: transform 0.2s ease-out;
    font-size: 12px;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-color);
}

#activity-calendar .day-cell:hover:not(.is-placeholder):not(.level-0) {
    transform: scale(1.3);
    z-index: 10;
    box-shadow: var(--shadow-md);
}

/* Niveles de actividad del calendario basados en tipo de entrenamiento */
#activity-calendar .day-cell.level-0 {
    background-color: var(--calendar-inactive-bg, #eef0f2);
    color: var(--text-muted-color, #718096);
}

#activity-calendar .day-cell.level-1 {
    background-color: var(--calendar-level-1, #dbeafe);
    color: var(--text-color);
    border: 2px solid var(--primary-color, #667eea);
}

#activity-calendar .day-cell.level-2 {
    background-color: var(--calendar-level-2, #fed7d7);
    color: var(--text-color);
    border: 2px solid var(--accent-color, #f56565);
}

#activity-calendar .day-cell.level-3 {
    background-color: var(--calendar-level-3, #c6f6d5);
    color: var(--text-color);
    border: 2px solid var(--success-color, #48bb78);
}

#activity-calendar .day-cell.is-placeholder {
    background-color: transparent !important;
    border: none !important;
    cursor: default;
}

#activity-calendar .day-cell.is-today {
    outline: 2px solid var(--accent-color);
    outline-offset: 1px;
}

/* Leyenda del calendario */
.calendar-legend {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
}

.calendar-legend h4 {
    margin: 0 0 var(--spacing-sm) 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-color);
    text-align: center;
}

.legend-items {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--spacing-sm);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.85rem;
    color: var(--text-color);
}

.legend-color {
    width: 16px;
    height: 16px;
    border-radius: 3px;
    flex-shrink: 0;
    border: 1px solid var(--border-color);
}

.legend-color.level-0 {
    background-color: var(--calendar-inactive-bg);
}

.legend-color.level-1 {
    background-color: var(--calendar-level-1);
    border-color: var(--primary-color);
}

.legend-color.level-2 {
    background-color: var(--calendar-level-2);
    border-color: var(--accent-color);
}

.legend-color.level-3 {
    background-color: var(--calendar-level-3);
    border-color: var(--success-color);
}

/* Responsive para la leyenda */
@media (max-width: 480px) {
    .legend-items {
        grid-template-columns: 1fr;
    }
    
    .legend-item {
        font-size: 0.8rem;
    }
}

/* Encabezados de días de la semana */
#activity-calendar .day-header {
    aspect-ratio: 1 / 1;
    min-width: 32px;
    min-height: 32px;
    background-color: var(--primary-color);
    color: var(--button-text);
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 2px;
}