body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: #f5f6fa;
}

header {
    background: #2c3e50;
    color: white;
    text-align: center;
    padding: 20px;
}

nav {
    display: flex;
    justify-content: center;
    background: #34495e;
}

.tab {
    flex: 1;
    padding: 15px;
    border: none;
    background: #34495e;
    color: white;
    cursor: pointer;
}

.tab.active {
    background: #1abc9c;
}

main {
    padding: 20px;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Calendar */

.calendar-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 6px;
}

.cell {
    padding: 10px;
    text-align: center;
    border-radius: 6px;
    font-size: 14px;
}

.available { background: #2ecc71; color: white; }
.booked { background: #e74c3c; color: white; }
.unavailable { background: #bdc3c7; }

/* Mobile */

@media (max-width: 600px) {
    .calendar-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}