:root {
    --blue-header: #3a668e;
    --blue-bg: #4a7fb0;
    --green-avail: #008000;
    --red-res: #ff0000;
    --orange-pass: #ffa500;
}

.calendar-container {
    width: 100%;
    max-width: 450px;
    font-family: 'Open Sans', sans-serif;
    background-color: var(--blue-bg);
    border-radius: 4px;
    overflow: hidden;
    margin: 20px auto;
}

.calendar-header {
    background-color: var(--blue-header);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px;
}

#monthSelector {
    padding: 5px;
    border-radius: 3px;
    width: 70%;
    font-weight: bold;
}

.nav-btn {
    background: #bdc3c7;
    border: none;
    color: white;
    padding: 5px 15px;
    border-radius: 3px;
    cursor: pointer;
}

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 2px;
    padding: 10px;
}

.day-label {
    text-align: center;
    color: white;
    font-weight: bold;
    padding-bottom: 5px;
}

.day {
    aspect-ratio: 1/1;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 14px;
    background: rgba(255,255,255,0.1);
}

.day.available { background-color: var(--green-avail); }
.day.reserved { background-color: var(--red-res); }
.day.passage { background-color: var(--orange-pass); }

.calendar-legend {
    background: white;
    padding: 15px;
    display: flex;
    justify-content: space-around;
    font-size: 13px;
    color: #666;
}

.legend-item { display: flex; align-items: center; gap: 5px; }
.box { width: 15px; height: 15px; display: inline-block; }
.box.available { background-color: var(--green-avail); }
.box.reserved { background-color: var(--red-res); }
.box.passage { background-color: var(--orange-pass); }