:root {
    --border-color: #ddd;
    --primary-bg: #f9f9f9;
    --hover-bg: #f0f0f0;
    --event-dot: #ff4500;
    --tooltip-bg: #333;
    --tooltip-text: #fff;
}

body {
    font-family: 'Meiryo', 'Hiragino Kaku Gothic ProN', 'MS PGothic', sans-serif;
    background-color: #f4f4f4;
    color: #333;
    margin: 0;
    padding: 20px;
}

.cal-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: #fff;
    /*box-shadow: 0 0 10px rgba(0,0,0,0.1);*/
    /*position: relative;*/
}

h3 {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 30px;
}

#calendar-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.month-container {
    border: 1px solid var(--border-color);
    background-color: var(--primary-bg);
    padding: 15px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.month-header {
    font-size: 1.5em;
    font-weight: bold;
    text-align: center;
    color: #34495e;
    margin-bottom: 15px;
}

.days-of-week, .date-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    text-align: center;
}

.days-of-week div {
    font-weight: bold;
    padding: 5px 0;
    color: #7f8c8d;
}

.date-cell {
    padding: 8px 0;
    border-top: 1px solid var(--border-color);
    position: relative;
    transition: background-color 0.3s;
}

.date-cell:hover {
    background-color: var(--hover-bg);
}

.date-cell.other-month {
    color: #ccc;
}

.date-cell .day-number {
    font-size: 0.9em;
}

.has-event .day-number::after {
    content: '●';
    color: var(--event-dot);
    font-size: 0.8em;
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
}

.tooltip {
    position: absolute;
    display: none;
    background-color: var(--tooltip-bg);
    color: var(--tooltip-text);
    padding: 5px;
    border-radius: 1px;
    font-size: 0.8em;
    white-space: pre-wrap;
    z-index: 1000;
    pointer-events: none; /* So it doesn't interfere with mouseout events */
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
    max-height: 800px;
    overflow-y: auto; 
}

#filter-container {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
    padding: 10px;
    margin-bottom: 20px;
    background-color: #f9f9f9;
    border-radius: 6px;
}
#filter-container label {
    display: flex;
    align-items: center;
    cursor: pointer;
}
#filter-container input {
    margin-right: 5px;
    position: inherit;
}