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

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

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

/* Navigation */
.navbar {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #2563eb;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: #2563eb;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 500;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background-color: #2563eb;
    color: white;
}

.btn-primary:hover {
    background-color: #1d4ed8;
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: #6b7280;
    color: white;
}

.btn-secondary:hover {
    background-color: #4b5563;
    transform: translateY(-2px);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    width: 100%;
}

/* Features Section */
.features {
    padding: 4rem 0;
    background-color: #fff;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    text-align: center;
    padding: 2rem;
    border-radius: 10px;
    background-color: #f9fafb;
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    margin-bottom: 0.5rem;
    color: #2563eb;
}

/* Products Section */
.page-header {
    background-color: #fff;
    padding: 3rem 0;
    text-align: center;
    border-bottom: 1px solid #e5e7eb;
}

.page-header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    color: #1f2937;
}

.page-header p {
    color: #6b7280;
    font-size: 1.1rem;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 2rem;
    padding: 3rem 0;
}

.product-card {
    background-color: #fff;
    border-radius: 10px;
    padding: 1.5rem;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.product-image {
    font-size: 5rem;
    margin-bottom: 1rem;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #f9fafb;
    border-radius: 8px;
}

.product-image-large {
    font-size: 8rem;
    height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #f9fafb;
    border-radius: 10px;
}

.product-card h3 {
    margin-bottom: 0.5rem;
    color: #1f2937;
}

.price {
    font-size: 1.5rem;
    font-weight: bold;
    color: #2563eb;
    margin-bottom: 1rem;
}

/* Product Detail */
.product-detail-section {
    padding: 3rem 0;
}

.product-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    background-color: #fff;
    padding: 3rem;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.product-detail-info h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #1f2937;
}

.product-price {
    font-size: 2rem;
    font-weight: bold;
    color: #2563eb;
    margin-bottom: 1.5rem;
}

.product-description {
    margin-bottom: 1.5rem;
    color: #6b7280;
    line-height: 1.8;
}

.product-features {
    list-style: none;
    margin-bottom: 2rem;
}

.product-features li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.product-features li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #10b981;
    font-weight: bold;
}

.product-actions {
    display: flex;
    gap: 1rem;
}

/* Checkout Form */
.checkout-section {
    padding: 3rem 0;
}

.checkout-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
}

.checkout-form-container {
    background-color: #fff;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.checkout-form h2 {
    margin-bottom: 1.5rem;
    color: #1f2937;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #e5e7eb;
}

.checkout-form h2:not(:first-of-type) {
    margin-top: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: #374151;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: #2563eb;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: normal;
}

.checkbox-group input[type="checkbox"] {
    width: auto;
}

/* Order Summary */
.order-summary {
    background-color: #fff;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    height: fit-content;
    position: sticky;
    top: 100px;
}

.order-summary h2 {
    margin-bottom: 1.5rem;
    color: #1f2937;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #e5e7eb;
}

.order-item {
    display: flex;
    justify-content: space-between;
    padding: 1rem 0;
    border-bottom: 1px solid #e5e7eb;
}

.order-item-info h4 {
    margin-bottom: 0.25rem;
    color: #1f2937;
}

.order-item-info p {
    font-size: 0.9rem;
    color: #6b7280;
}

.order-item-price {
    font-weight: bold;
    color: #1f2937;
}

.order-total {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 2px solid #e5e7eb;
}

.order-total-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    color: #6b7280;
}

.order-total-row.total {
    font-size: 1.25rem;
    font-weight: bold;
    color: #1f2937;
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid #e5e7eb;
}

/* About Section */
.about-section {
    padding: 3rem 0;
}

.about-content {
    background-color: #fff;
    padding: 3rem;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.about-text h2 {
    margin-bottom: 1rem;
    color: #1f2937;
    margin-top: 2rem;
}

.about-text h2:first-child {
    margin-top: 0;
}

.about-text p {
    margin-bottom: 1rem;
    color: #6b7280;
    line-height: 1.8;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.value-card {
    padding: 1.5rem;
    background-color: #f9fafb;
    border-radius: 8px;
    border-left: 4px solid #2563eb;
}

.value-card h3 {
    margin-bottom: 0.5rem;
    color: #2563eb;
}

.value-card p {
    color: #6b7280;
    margin: 0;
}

/* Success Page */
.success-section {
    padding: 4rem 0;
    min-height: 60vh;
}

.success-container {
    max-width: 800px;
    margin: 0 auto;
    background-color: #fff;
    padding: 3rem;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    text-align: center;
}

.success-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background-color: #10b981;
    color: white;
    font-size: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 2rem;
    font-weight: bold;
}

.success-container h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #1f2937;
}

.success-message {
    font-size: 1.2rem;
    color: #6b7280;
    margin-bottom: 3rem;
}

.order-details {
    text-align: left;
    margin-bottom: 2rem;
    padding: 2rem;
    background-color: #f9fafb;
    border-radius: 8px;
}

.order-details h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: #1f2937;
    text-align: center;
}

.order-info {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid #e5e7eb;
}

.info-row:last-child {
    border-bottom: none;
}

.info-label {
    font-weight: 500;
    color: #6b7280;
}

.info-value {
    font-weight: 600;
    color: #1f2937;
}

.order-items-summary {
    text-align: left;
    margin-bottom: 2rem;
    padding: 2rem;
    background-color: #f9fafb;
    border-radius: 8px;
}

.order-items-summary h3 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: #1f2937;
    text-align: center;
}

.summary-item {
    display: flex;
    justify-content: space-between;
    padding: 1rem 0;
    border-bottom: 1px solid #e5e7eb;
}

.summary-item-info h4 {
    margin-bottom: 0.25rem;
    color: #1f2937;
}

.summary-item-info p {
    font-size: 0.9rem;
    color: #6b7280;
}

.summary-item-price {
    font-weight: bold;
    color: #1f2937;
}

.summary-total {
    display: flex;
    justify-content: space-between;
    padding: 1rem 0;
    margin-top: 1rem;
    font-size: 1.25rem;
    font-weight: bold;
    color: #1f2937;
    border-top: 2px solid #e5e7eb;
    padding-top: 1rem;
}

.success-actions {
    margin-top: 2rem;
}

.confirmation-text {
    color: #6b7280;
    margin-bottom: 2rem;
    font-size: 1rem;
}

.action-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Footer */
footer {
    background-color: #1f2937;
    color: #fff;
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        gap: 1rem;
        font-size: 0.9rem;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .product-detail {
        grid-template-columns: 1fr;
    }
    
    .checkout-container {
        grid-template-columns: 1fr;
    }
    
    .order-summary {
        position: static;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .product-actions {
        flex-direction: column;
    }
    
    .product-actions .btn {
        width: 100%;
    }
    
    .success-container {
        padding: 2rem 1.5rem;
    }
    
    .success-icon {
        width: 60px;
        height: 60px;
        font-size: 2rem;
    }
    
    .success-container h1 {
        font-size: 2rem;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .action-buttons .btn {
        width: 100%;
    }
}