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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px 0;
    margin-bottom: 30px;
}

header h1 {
    text-align: center;
    font-size: 28px;
}

header nav {
    text-align: center;
    margin-top: 15px;
}

header nav a {
    color: white;
    text-decoration: none;
    margin: 0 15px;
    padding: 8px 16px;
    border-radius: 20px;
    transition: background 0.3s;
}

header nav a:hover {
    background: rgba(255,255,255,0.2);
}

/* Products Grid */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.product-card {
    background: white;
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

.product-card img {
    width: 150px;
    height: 150px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 15px;
}

.product-card h3 {
    margin-bottom: 10px;
    color: #333;
}

.product-card .price {
    font-size: 24px;
    font-weight: bold;
    color: #667eea;
    margin-bottom: 15px;
}

.product-card .description {
    color: #666;
    font-size: 14px;
    margin-bottom: 15px;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.3s;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-success {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    color: white;
}

.btn-danger {
    background: linear-gradient(135deg, #eb3349 0%, #f45c43 100%);
    color: white;
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Cart */
.cart-section {
    background: white;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.cart-section h2 {
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #eee;
}

.cart-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
    border-bottom: 1px solid #eee;
}

.cart-item:last-child {
    border-bottom: none;
}

.cart-total {
    font-size: 24px;
    font-weight: bold;
    text-align: right;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 2px solid #eee;
}

/* Forms */
.form-section {
    background: white;
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    max-width: 600px;
    margin: 0 auto;
}

.form-section h2 {
    margin-bottom: 25px;
    text-align: center;
    color: #333;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
}

.form-row {
    display: flex;
    gap: 15px;
}

.form-row .form-group {
    flex: 1;
}

/* Steps Indicator */
.steps {
    display: flex;
    justify-content: center;
    margin-bottom: 30px;
}

.step {
    display: flex;
    align-items: center;
    color: #aaa;
}

.step-number {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    background: #e0e0e0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    margin-right: 10px;
}

.step.active .step-number {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.step.active {
    color: #333;
}

.step.completed .step-number {
    background: #38ef7d;
    color: white;
}

.step-divider {
    width: 50px;
    height: 2px;
    background: #e0e0e0;
    margin: 0 15px;
}

/* Status Messages */
.status-box {
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    margin: 20px 0;
}

.status-waiting {
    background: #fff3cd;
    border: 2px solid #ffc107;
}

.status-success {
    background: #d4edda;
    border: 2px solid #28a745;
}

.status-error {
    background: #f8d7da;
    border: 2px solid #dc3545;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid #e0e0e0;
    border-top-color: #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Alert */
.alert {
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.alert-info {
    background: #e3f2fd;
    border: 1px solid #2196f3;
    color: #1565c0;
}

.alert-warning {
    background: #fff3cd;
    border: 1px solid #ffc107;
    color: #856404;
}

.alert-success {
    background: #d4edda;
    border: 1px solid #28a745;
    color: #155724;
}

.alert-error {
    background: #f8d7da;
    border: 1px solid #dc3545;
    color: #721c24;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 50px;
    color: #666;
}

.empty-state svg {
    width: 100px;
    height: 100px;
    margin-bottom: 20px;
    opacity: 0.5;
}

/* Quantity Controls */
.quantity-controls {
    display: flex;
    align-items: center;
    gap: 10px;
}

.quantity-controls button {
    width: 30px;
    height: 30px;
    border: none;
    background: #667eea;
    color: white;
    border-radius: 50%;
    cursor: pointer;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.quantity-controls span {
    font-size: 18px;
    min-width: 30px;
    text-align: center;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    .products-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }

    .form-row {
        flex-direction: column;
        gap: 0;
    }

    .steps {
        flex-wrap: wrap;
        gap: 10px;
    }

    .step-divider {
        display: none;
    }
}