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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f5f5f5;
}

header {
    background: #fff;
    padding: 2rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.step {
    display: none;
    background: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.step.active {
    display: block;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.product-card {
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 1.5rem;
    cursor: pointer;
    transition: all 0.3s;
}

.product-card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    transform: translateY(-2px);
}

.product-card.selected {
    border-color: #007bff;
    background: #f0f8ff;
}

.product-price {
    font-size: 1.5rem;
    font-weight: bold;
    color: #007bff;
}

.product-duration {
    color: #666;
    font-size: 0.9rem;
}

#calendar-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin: 2rem 0;
}

#date-picker {
    min-height: 300px;
}

#time-slots {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: 0.5rem;
    align-content: start;
}

.time-slot {
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}

.time-slot:hover:not(.unavailable) {
    background: #f0f8ff;
}

.time-slot.selected {
    background: #007bff;
    color: white;
}

.time-slot.unavailable {
    background: #f5f5f5;
    color: #999;
    cursor: not-allowed;
}

.btn-primary, .btn-secondary {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s;
}

.btn-primary {
    background: #007bff;
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: #0056b3;
}

.btn-primary:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.btn-secondary {
    background: #6c757d;
    color: white;
    margin-right: 1rem;
}

.loader {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #007bff;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 2rem auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}