:root {
    --primary-color: #007aff;
    --background-color: #f0f2f5;
    --card-background: #ffffff;
    --text-color: #1d1d1f;
    --secondary-text-color: #6a6a6a;
    --border-color: #e5e5ea;
    --input-background: #f7f7f9;
    --shadow-light: 0 4px 12px rgba(0, 0, 0, 0.05);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 800px;
    width: 100%;
    background-color: var(--card-background);
    border-radius: 24px;
    box-shadow: var(--shadow-light);
    padding: 40px;
    display: grid;
    gap: 30px;
}

h1 {
    font-size: 2.2rem;
    font-weight: 600;
    color: var(--text-color);
    text-align: center;
}

p.subtitle {
    text-align: center;
    color: var(--secondary-text-color);
    margin-top: 8px;
    margin-bottom: 30px;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 25px;
}

@media (min-width: 768px) {
    .form-grid {
        grid-template-columns: 1fr 1fr;
    }
}

.calendar-section {
    grid-column: 1 / -1;
}

.booking-section {
    grid-column: 1 / -1;
}

.input-group {
    margin-bottom: 20px;
}

label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--secondary-text-color);
}

input[type="date"],
input[type="text"],
input[type="email"],
input[type="tel"],
select {
    width: 100%;
    padding: 14px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    font-size: 1rem;
    color: var(--text-color);
    background-color: var(--input-background);
    transition: all 0.2s ease;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
}

input[type="date"]:focus,
input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.15);
}

input::placeholder {
    color: var(--secondary-text-color);
    opacity: 0.6;
}

.time-slots {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 10px;
}

.time-slot-label {
    position: relative;
    cursor: pointer;
    text-align: center;
}

.time-slot-label input[type="radio"] {
    position: absolute;
    opacity: 0;
}

.slot-text {
    display: block;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    background-color: var(--card-background);
    transition: all 0.2s ease;
    font-weight: 500;
}

.time-slot-label input[type="radio"]:checked + .slot-text {
    background-color: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
}

.time-slot-label.occupied {
    cursor: not-allowed;
    opacity: 0.5;
}

.time-slot-label.occupied .slot-text {
    background-color: #f0f0f5;
    color: var(--secondary-text-color);
    border-color: #e0e0e5;
}

.submit-button {
    width: 100%;
    padding: 16px;
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.submit-button:hover {
    background-color: #006ee6;
}

.alert-message, .error-message {
    padding: 20px;
    background-color: #fdf2f2;
    color: #d90000;
    border-radius: 12px;
    text-align: center;
    font-weight: 500;
}

.success-message {
    text-align: center;
    padding: 40px;
    border-radius: 12px;
    background-color: #f0fdf4;
    color: #22c55e;
}
.success-message h1 { color: #22c55e; margin-bottom: 10px; }
.success-message p { color: #16a34a; }
.success-message a { color: #007aff; text-decoration: none; font-weight: 500; }
.success-message a:hover { text-decoration: underline; }