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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: #ffffff;
    color: #333333;
    line-height: 1.6;
    min-height: 100vh;
    padding-top: 80px; /* Account for fixed navbar */
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: #ffffff;
    border-bottom: 1px solid #e9ecef;
    z-index: 1000;
    height: 70px;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.nav-logo a {
    font-size: 1.2rem;
    font-weight: 600;
    color: #333333;
    text-decoration: none;
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: #666666;
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    transition: all 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: #3498db;
    background-color: #f8f9fa;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.bar {
    width: 25px;
    height: 3px;
    background-color: #333333;
    border-radius: 2px;
    transition: 0.3s;
}

.hamburger.active .bar:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

.hamburger.active .bar:nth-child(2) {
    opacity: 0;
}

.hamburger.active .bar:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 300;
    margin-bottom: 0.5rem;
    color: #000000;
}

header p {
    color: #666666;
    font-size: 1.1rem;
}

/* Background Notice */
.background-notice {
    background-color: #fff3cd;
    border: 1px solid #ffeaa7;
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 2rem;
    text-align: center;
}

.background-notice p {
    color: #856404;
    margin: 0;
    font-size: 1rem;
}

/* Upload Area */
.upload-area {
    border: 3px dashed #e9ecef;
    border-radius: 12px;
    padding: 3rem 2rem;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    margin-bottom: 2rem;
}

.upload-area:hover {
    border-color: #3498db;
    background-color: #f8f9fa;
}

.upload-area.dragover {
    border-color: #3498db;
    background-color: #e3f2fd;
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.upload-icon {
    width: 64px;
    height: 64px;
    color: #666666;
}

.upload-area p {
    font-size: 1.1rem;
    color: #666666;
    margin: 0;
}

.upload-subtitle {
    font-size: 0.9rem !important;
    color: #999999 !important;
}

.upload-button {
    background-color: #000000;
    color: #ffffff;
    border: none;
    padding: 0.75rem 2rem;
    border-radius: 25px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.upload-button:hover {
    background-color: #3498db;
    transform: translateY(-2px);
}

/* Image Section */
.image-section {
    margin-bottom: 2rem;
}

.image-container {
    text-align: center;
    margin-bottom: 2rem;
    padding: 2rem;
    background-color: #f8f9fa;
    border-radius: 12px;
    border: 1px solid #e9ecef;
}

.image-container img {
    max-width: 100%;
    max-height: 400px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

/* Controls */
.controls {
    background-color: #ffffff;
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid #e9ecef;
}

.size-controls {
    margin-bottom: 2rem;
}

.size-controls label {
    display: block;
    margin-bottom: 1rem;
    font-weight: 500;
    color: #333333;
}

.size-controls input[type="range"] {
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: #e9ecef;
    outline: none;
    -webkit-appearance: none;
    margin-bottom: 0.5rem;
}

.size-controls input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #3498db;
    cursor: pointer;
    border: 2px solid #ffffff;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

.size-controls input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #3498db;
    cursor: pointer;
    border: 2px solid #ffffff;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

#sizeDisplay {
    font-size: 1.1rem;
    font-weight: 600;
    color: #3498db;
}

.constraint-info {
    font-size: 0.9rem;
    color: #666666;
    margin-top: 0.5rem;
    font-style: italic;
}

.sizing-guide-note {
    margin-top: 1.5rem;
    padding: 1rem;
    background-color: #f8f9fa;
    border-radius: 8px;
    border: 1px solid #e9ecef;
    text-align: center;
}

.sizing-guide-link {
    color: #3498db;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.sizing-guide-link:hover {
    color: #2980b9;
    text-decoration: underline;
}

.dimension-display {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
}

.dimension-item {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem;
    background-color: #f8f9fa;
    border-radius: 8px;
    border: 1px solid #e9ecef;
}

.dimension-item .label {
    font-weight: 500;
    color: #666666;
}

.dimension-item span:last-child {
    font-weight: 600;
    color: #333333;
}

/* Cost Section */
.cost-section {
    text-align: center;
}

.cost-display {
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    padding: 3rem 2rem;
    border-radius: 12px;
    border: 1px solid #e9ecef;
    margin-bottom: 2rem;
}

.cost-display h2 {
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 1rem;
    color: #333333;
}

.cost-amount {
    font-size: 3rem;
    font-weight: 600;
    color: #3498db;
    margin-bottom: 1rem;
}

.cost-breakdown {
    font-size: 1.1rem;
    color: #666666;
    padding: 1rem;
    background-color: #f8f9fa;
    border-radius: 8px;
    border: 1px solid #e9ecef;
}

.reset-button {
    background-color: #ffffff;
    color: #333333;
    border: 2px solid #e9ecef;
    padding: 0.75rem 2rem;
    border-radius: 25px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.reset-button:hover {
    border-color: #3498db;
    color: #3498db;
    transform: translateY(-2px);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .upload-area {
        padding: 2rem 1rem;
    }
    
    .cost-amount {
        font-size: 2.5rem;
    }
    
    .dimension-display {
        grid-template-columns: 1fr;
    }
}

/* Animation */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.image-section,
.cost-section {
    animation: fadeIn 0.5s ease-out;
}

/* Focus states for accessibility */
button:focus,
input:focus {
    outline: 2px solid #3498db;
    outline-offset: 2px;
}

/* Loading state */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* Sizing Guide Page */
.sizing-guide-content {
    max-width: 900px;
    margin: 0 auto;
}

.size-category {
    margin-bottom: 3rem;
    background-color: #ffffff;
    border-radius: 12px;
    border: 1px solid #e9ecef;
    padding: 2rem;
}

.size-category h2 {
    font-size: 1.8rem;
    font-weight: 500;
    color: #333333;
    margin-bottom: 1.5rem;
    text-align: center;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #3498db;
}

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

.size-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background-color: #f8f9fa;
    border-radius: 8px;
    border: 1px solid #e9ecef;
    transition: all 0.3s ease;
}

.size-item:hover {
    background-color: #e3f2fd;
    border-color: #3498db;
}

.size-label {
    font-weight: 500;
    color: #333333;
}

.size-measurement {
    font-weight: 600;
    color: #3498db;
    font-size: 1.1rem;
}

.height-constraint-note {
    margin-top: 2rem;
    padding: 1.5rem;
    background-color: #fff3cd;
    border: 1px solid #ffeaa7;
    border-radius: 8px;
    text-align: center;
}

.height-constraint-note p {
    color: #856404;
    margin: 0;
    font-size: 1.1rem;
}

.guide-note {
    margin-top: 3rem;
    padding: 2rem;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-radius: 12px;
    border: 1px solid #e9ecef;
    text-align: center;
}

.guide-note p {
    margin-bottom: 1.5rem;
    color: #666666;
    font-size: 1.1rem;
}

.back-button {
    display: inline-block;
    background-color: #3498db;
    color: #ffffff;
    padding: 0.75rem 2rem;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.back-button:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
}

.add-to-cart-button {
    background-color: #3498db;
    color: #ffffff;
    border: none;
    padding: 0.75rem 2rem;
    border-radius: 25px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    margin-top: 1rem;
}

.add-to-cart-button:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
}

.cart-controls {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-top: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.quantity-section {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.quantity-section label {
    font-weight: 500;
    color: #333333;
}

.quantity-section input {
    width: 70px;
    padding: 0.5rem;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 1rem;
    text-align: center;
    transition: border-color 0.3s ease;
}

.quantity-section input:focus {
    outline: none;
    border-color: #3498db;
}

.cart-count {
    background-color: #3498db;
    color: #ffffff;
    border-radius: 50%;
    padding: 0.2rem 0.5rem;
    font-size: 0.8rem;
    font-weight: 600;
    margin-left: 0.5rem;
    min-width: 1.5rem;
    text-align: center;
    display: inline-block;
}

/* Cart Page Styles */
.cart-content {
    max-width: 900px;
    margin: 0 auto;
}

.empty-cart {
    text-align: center;
    padding: 4rem 2rem;
}

.empty-cart-content {
    max-width: 400px;
    margin: 0 auto;
}

.empty-cart-icon {
    width: 80px;
    height: 80px;
    color: #cccccc;
    margin-bottom: 2rem;
}

.empty-cart h2 {
    color: #666666;
    margin-bottom: 1rem;
    font-weight: 400;
}

.empty-cart p {
    color: #999999;
    margin-bottom: 2rem;
}

.continue-shopping-button {
    display: inline-block;
    background-color: #3498db;
    color: #ffffff;
    padding: 0.75rem 2rem;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.continue-shopping-button:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
}

.cart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid #e9ecef;
}

.cart-header h2 {
    color: #333333;
    font-weight: 500;
}

.clear-cart-button {
    background-color: #ffffff;
    color: #dc3545;
    border: 2px solid #dc3545;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.clear-cart-button:hover {
    background-color: #dc3545;
    color: #ffffff;
}

.cart-item {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1.5rem;
    background-color: #ffffff;
    border: 1px solid #e9ecef;
    border-radius: 12px;
    margin-bottom: 1rem;
    transition: all 0.3s ease;
}

.cart-item:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.cart-item-image {
    width: 80px;
    height: 80px;
    border-radius: 8px;
    object-fit: cover;
    border: 1px solid #e9ecef;
}

.cart-item-details {
    flex: 1;
}

.cart-item-name {
    font-weight: 600;
    color: #333333;
    margin-bottom: 0.5rem;
}

.cart-item-specs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.cart-item-spec {
    font-size: 0.9rem;
    color: #666666;
}

.cart-item-cost {
    font-weight: 600;
    color: #3498db;
    font-size: 1.1rem;
}

.cart-item-pricing {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.unit-cost {
    font-size: 0.9rem;
    color: #666666;
}

.quantity-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.quantity-controls label {
    font-size: 0.9rem;
    font-weight: 500;
    color: #666666;
}

.qty-btn {
    width: 30px;
    height: 30px;
    border: 1px solid #3498db;
    background-color: #ffffff;
    color: #3498db;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    transition: all 0.3s ease;
}

.qty-btn:hover {
    background-color: #3498db;
    color: #ffffff;
}

.qty-input {
    width: 50px;
    padding: 0.25rem;
    border: 1px solid #e9ecef;
    border-radius: 4px;
    text-align: center;
    font-size: 0.9rem;
}

.qty-input:focus {
    outline: none;
    border-color: #3498db;
}

.cart-item-actions {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.remove-item-button {
    background-color: #ffffff;
    color: #dc3545;
    border: 1px solid #dc3545;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.remove-item-button:hover {
    background-color: #dc3545;
    color: #ffffff;
}

.cart-summary {
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid #e9ecef;
    margin: 2rem 0;
}

.summary-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
}

.summary-label {
    font-weight: 500;
    color: #666666;
}

.summary-value {
    font-weight: 600;
    color: #333333;
}

.total-cost-row {
    border-top: 2px solid #e9ecef;
    margin-top: 1rem;
    padding-top: 1rem;
}

.total-cost {
    font-size: 1.5rem;
    color: #3498db !important;
}

.cart-actions {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
    margin-top: 2rem;
}

.email-cart-button {
    background-color: #3498db;
    color: #ffffff;
    border: none;
    padding: 1rem 2rem;
    border-radius: 25px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-width: 250px;
    justify-content: center;
}

.email-cart-button:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
}

.email-cart-button:active {
    transform: translateY(0);
}

.email-icon {
    width: 20px;
    height: 20px;
    stroke-width: 2;
}

.checkout-button {
    background-color: #28a745;
    color: #ffffff;
    border: none;
    padding: 0.75rem 2rem;
    border-radius: 25px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.checkout-button:disabled {
    background-color: #cccccc;
    cursor: not-allowed;
}

.checkout-button:not(:disabled):hover {
    background-color: #218838;
    transform: translateY(-2px);
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: #ffffff;
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding-top: 2rem;
        transition: left 0.3s ease;
        border-top: 1px solid #e9ecef;
    }

    .nav-menu.active {
        left: 0;
    }

    .hamburger {
        display: flex;
    }

    .size-grid {
        grid-template-columns: 1fr;
    }

    .size-category {
        padding: 1.5rem;
    }
    
    .cart-item {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
    
    .cart-item-image {
        width: 120px;
        height: 120px;
    }
    
    .cart-actions {
        flex-direction: column;
    }
    
    .cart-header {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
    
    .cart-controls {
        flex-direction: column;
        gap: 1rem;
    }
    
    .quantity-section {
        justify-content: center;
    }
    
    .quantity-controls {
        justify-content: center;
        margin-bottom: 1rem;
    }
    
    .email-cart-button {
        min-width: 100%;
        padding: 1rem 1.5rem;
        font-size: 0.9rem;
    }
    
    .email-icon {
        width: 18px;
        height: 18px;
    }
}

/* Version Number */
.version-number {
    position: fixed;
    bottom: 10px;
    right: 15px;
    background-color: rgba(52, 152, 219, 0.9);
    color: white;
    padding: 5px 10px;
    border-radius: 15px;
    font-size: 0.75rem;
    font-weight: 500;
    z-index: 999;
    backdrop-filter: blur(5px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: opacity 0.3s ease;
}

.version-number:hover {
    opacity: 0.8;
}

@media (max-width: 768px) {
    .version-number {
        bottom: 5px;
        right: 10px;
        font-size: 0.7rem;
        padding: 4px 8px;
    }
}