body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #f4f4f9;
    color: #333;
    margin: 0;
    padding: 1em; /* Reduced padding for mobile */
}

#calendar-year {
    text-align: center;
    font-size: 2.5em; /* Slightly smaller for mobile */
    color: #1a1a1a;
    margin-bottom: 0.5em;
}

#calendar-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); /* Slightly narrower min-width */
    gap: 1.5em;
    justify-content: center; /* Center the grid items */
    max-width: 1200px;
    margin: 0 auto; /* Center the container itself */
}

.month-wrapper {
    width: 100%;
    max-width: 400px;
    margin: 0 auto; /* Center each month within its grid cell */
}

.month-header {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    margin-bottom: 0.5em;
}

.month-wrapper h2 {
    margin: 0;
    color: #333;
    font-size: 1.5em;
}

.month-reset-btn {
    position: absolute;
    right: 0;
    background: none;
    border: none;
    color: #bbb;
    font-size: 1.2em;
    cursor: pointer;
    padding: 5px;
    line-height: 1;
    transition: color 0.2s, transform 0.2s;
}

.month-reset-btn:hover {
    color: #ff69b4;
}

.month-reset-btn:active {
    transform: rotate(-90deg);
}

.calendar {
    width: 100%;
    border-collapse: collapse;
    background-color: #fff;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    border-radius: 8px;
    overflow: hidden; /* Ensures the border-radius is respected by children */
}

.calendar th, .calendar td {
    text-align: center;
    padding: 0.5em 0.25em; /* Reduced padding slightly to accommodate fixed height */
    width: 14.28%; /* 100% / 7 days */
    height: 3.5em; /* Fixed height to prevent resizing */
    box-sizing: border-box;
    vertical-align: middle;
}

.calendar th {
    background-color: #e9e9f2;
    font-weight: 600;
    color: #555;
}

.calendar td {
    border-top: 1px solid #eee;
    color: #444;
    cursor: pointer; /* Indicates dates are clickable */
    transition: background-color 0.2s;
}

.calendar .weekend {
    background-color: #fafafa;
    color: #888;
}

.calendar .holiday {
    color: #e74c3c; /* Red for holidays */
    font-weight: bold;
}

/* New style for the selected date (vacation) */
.calendar td.selected {
    background-color: #e0f2f1; /* 연한 민트색 (빨간색과 대비가 좋음) */
    color: #00796b; /* 진한 민트색 글자 */
    font-weight: 900;
    font-size: 0.85em; /* Slightly larger for readability */
    line-height: 1.1; /* Adjusted for multi-line */
    font-family: "Courier New", Courier, monospace;
    border-radius: 0;
}

/* Style for sick leave (병가) */
.calendar td.sick {
    background-color: #fff3e0; /* 연한 오렌지색 */
    color: #ef6c00; /* 진한 오렌지색 글자 */
    font-weight: 900;
    font-size: 0.85em;
    line-height: 1.1;
    font-family: "Courier New", Courier, monospace;
    border-radius: 0;
}

/* Ensure weekend style is overridden when selected or sick */
.calendar td.selected.weekend, .calendar td.sick.weekend {
    background-color: inherit; /* Maintain their specific background */
    color: inherit;
}

.calendar td.selected.weekend { background-color: #e0f2f1; color: #00796b; }
.calendar td.sick.weekend { background-color: #fff3e0; color: #ef6c00; }