root {
    --primary-color: #007bff;
    --secondary-color: #f8f9fa;
    --border-color: #dee2e6;
    --text-color: #333;
    --today-bg: #fff3cd;
    --selected-bg: #d1e7fd;
    --booked-marker: #dc3545;
    --success-color: #198754;
    --error-color: #dc3545;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--secondary-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 500px;
    margin: 1rem auto;
    padding: 1rem;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

header {
    text-align: center;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

h1 {
    color: var(--primary-color);
}

.calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.calendar-header button {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    cursor: pointer;
    font-size: 1.2rem;
    transition: background-color 0.2s;
}

.calendar-header button:hover {
    background-color: #e9ecef;
}

.calendar-weekdays, .calendar-grid {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    text-align: center;
    gap: 5px;
}

.calendar-weekdays div {
    font-weight: bold;
    padding: 0.5rem 0;
}

.day-cell {
    padding: 0.5rem 0;
    border-radius: 50%;
    cursor: pointer;
    position: relative;
    transition: background-color 0.2s;
    aspect-ratio: 1 / 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.day-cell.not-current-month {
    color: #aaa;
}

.day-cell.today {
    background-color: var(--today-bg);
    font-weight: bold;
}

.day-cell.selected {
    background-color: var(--selected-bg);
    border: 2px solid var(--primary-color);
}

.day-cell.disabled {
    color: #ccc;
    cursor: not-allowed;
    text-decoration: line-through;
}


.day-cell.has-booking::after {
    content: '';
    position: absolute;
    bottom: 5px;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    background-color: #ff0000;
    border-radius: 50%;
}

#details-container {
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

#details-container.hidden {
    display: none;
}

#bookings-list .booking-item {
    padding: 0.8rem;
    margin-bottom: 0.5rem;
    border-left: 5px solid;
    background-color: var(--secondary-color);
    border-radius: 4px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#bookings-list .booking-item-info {
    font-size: 0.9rem;
}

#bookings-list .booking-time {
    font-weight: bold;
}

.btn-cancel {
    padding: 0.3rem 0.6rem;
    border: 1px solid var(--error-color);
    background-color: #fff;
    color: var(--error-color);
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8rem;
}
.btn-cancel:hover {
    background-color: var(--error-color);
    color: #fff;
}


form {
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.3rem;
    font-weight: bold;
}
.form-group-inline {
    display: flex;
    gap: 1rem;
    width: 100%;
}
.form-group-inline .form-group {
    flex: 1;
}

input[type="text"], input[type="password"], select {
    width: 100%;
    padding: 0.7rem;
    border: 1px solid;
    border-radius: 4px;
    font-size: 1rem;
}

.color-selector {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.color-option {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    cursor: pointer;
    border: 3px solid transparent;
}

.color-option.selected {
    border-color: var(--primary-color);
}

.btn-submit {
    padding: 0.8rem;
    background-color: #0056b3;
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-submit:hover {
    background-color: #0056b3;
}

.message {
    text-align: center;
    font-weight: bold;
    padding: 0.5rem;
    border-radius: 4px;
}
.message.success {
    color: var(--success-color);
    background-color: #d1e7dd;
}
.message.error {
    color: var(--error-color);
    background-color: #f8d7da;
}