/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

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

/* Header Styles */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo img {
    height: 50px;
    margin-right: 15px;
}

.company-logo {
    max-height: 50px;
    width: auto;
    object-fit: contain;
    border-radius: 5px;
}

.logo span {
    font-size: 1.5rem;
    font-weight: bold;
    color: #4a90e2;
}

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

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: #4a90e2;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #4a90e2;
    transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 2px 0;
    transition: 0.3s;
    transform-origin: center;
}

/* Mobile menu toggle animation */
.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}

/* Hero Section */
.hero {
    height: 100vh;
    position: relative;
    overflow: hidden;
}

.hero-slider {
    height: 100%;
    position: relative;
}

.hero-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s ease-in-out;
    z-index: 1;
    pointer-events: none;
}

.hero-slide.active {
    opacity: 1;
    z-index: 2;
    pointer-events: auto;
}

.hero-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-content {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    transform: translateY(-50%);
    text-align: center;
    color: white;
    z-index: 10;
}

.hero-content::before {
    content: '';
    position: absolute;
    top: -50px;
    left: 0;
    right: 0;
    bottom: -50px;
    background: rgba(0, 0, 0, 0.4);
    z-index: -1;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-indicators {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 10;
}

.indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: all 0.3s ease;
}

.indicator.active {
    background: white;
}

/* Button Styles */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border: none;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 500;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, #4a90e2, #357abd);
    color: white;
    box-shadow: 0 4px 15px rgba(74, 144, 226, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(74, 144, 226, 0.4);
}

/* Section Styles */
section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #4a90e2;
}

.section-header p {
    font-size: 1.1rem;
    color: #666;
}

/* Company Intro */
.company-intro {
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
}

.intro-content h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
    color: #4a90e2;
}

.intro-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    margin-top: 40px;
}

.feature {
    text-align: center;
    padding: 40px 20px;
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.feature:hover {
    transform: translateY(-10px);
}

.feature i {
    font-size: 3rem;
    color: #4a90e2;
    margin-bottom: 20px;
}

.feature h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: #333;
}

.feature p {
    color: #666;
    line-height: 1.8;
}

/* Products Section */
.products {
    background: white;
    position: relative;
}

/* 产品背景图片网格 */
.products-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
    opacity: 0.1;
    overflow: hidden;
}

.product-bg-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(2, 1fr);
    height: 100%;
    width: 100%;
}

.bg-item {
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    transition: all 0.3s ease;
}

.products .container {
    position: relative;
    z-index: 2;
}

/* 产品背景图片响应式设计 */
@media (max-width: 768px) {
    .product-bg-grid {
        grid-template-columns: repeat(2, 1fr);
        grid-template-rows: repeat(4, 1fr);
    }
    
    .products-background {
        opacity: 0.05;
    }
}

@media (max-width: 480px) {
    .product-bg-grid {
        grid-template-columns: 1fr;
        grid-template-rows: repeat(8, 1fr);
    }
    
    .products-background {
        opacity: 0.03;
    }
}

.category-tabs {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.category-btn {
    padding: 12px 30px;
    border: 2px solid #4a90e2;
    background: white;
    color: #4a90e2;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.category-btn.active,
.category-btn:hover {
    background: #4a90e2;
    color: white;
}

.category-content {
    display: none;
}

.category-content.active {
    display: block;
}

/* Product Overview */
.product-type {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.type-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.type-card:hover {
    transform: translateY(-10px);
}

.type-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.type-info {
    padding: 20px;
    text-align: center;
}

.type-info h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: #333;
}

.type-info p {
    color: #666;
    margin-bottom: 15px;
}

.product-count {
    background: #4a90e2;
    color: white;
    padding: 5px 15px;
    border-radius: 15px;
    font-size: 0.9rem;
    font-weight: 500;
}

/* Material Grid */
.material-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.material-card {
    background: white;
    border-radius: 15px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.material-card:hover {
    transform: translateY(-10px);
}

.material-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #4a90e2, #357abd);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.material-icon i {
    font-size: 2rem;
    color: white;
}

.material-card h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: #333;
}

.material-card p {
    color: #666;
    margin-bottom: 20px;
}

.material-card .product-count {
    display: inline-block;
    background: #f8f9fa;
    color: #4a90e2;
    padding: 8px 16px;
    border-radius: 20px;
    margin-bottom: 20px;
    font-weight: 500;
}

.view-products-btn {
    background: #4a90e2;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.view-products-btn:hover {
    background: #357abd;
    transform: translateY(-2px);
}

/* Length Grid */
.length-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
}

.length-card {
    background: white;
    border-radius: 15px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.length-card:hover {
    transform: translateY(-10px);
}

.length-visual {
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.sock-outline {
    background: #4a90e2;
    border-radius: 10px;
}

.sock-pantyhose {
    width: 20px;
    height: 80px;
}

.sock-long {
    width: 15px;
    height: 60px;
}

.sock-mid {
    width: 15px;
    height: 45px;
}

.sock-short {
    width: 15px;
    height: 30px;
}

.sock-invisible {
    width: 15px;
    height: 15px;
    border-radius: 50%;
}

/* Company Gallery */
.company-gallery {
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.gallery-item {
    position: relative;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.gallery-item:hover {
    transform: translateY(-10px);
}

.gallery-item img {
    width: 100%;
    height: 250px;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.gallery-item:hover img {
    transform: scale(1.1);
}

.gallery-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
    color: white;
    padding: 30px 20px 20px;
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

.gallery-item:hover .gallery-overlay {
    transform: translateY(0);
}

.gallery-overlay h3 {
    font-size: 1.3rem;
    margin-bottom: 5px;
}

/* About Company */
.about-company {
    background: white;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 60px;
    align-items: center;
}

.about-text h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: #4a90e2;
}

.lead {
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 40px;
    line-height: 1.8;
}

.about-features {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.about-feature {
    display: flex;
    align-items: center;
    gap: 20px;
}

.about-feature i {
    font-size: 2rem;
    color: #4a90e2;
    min-width: 50px;
}

.about-feature h4 {
    font-size: 1.2rem;
    margin-bottom: 5px;
    color: #333;
}

.about-feature p {
    color: #666;
    font-size: 0.95rem;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}

.stat-item {
    text-align: center;
    padding: 20px;
    background: linear-gradient(135deg, #4a90e2, #357abd);
    color: white;
    border-radius: 15px;
}

.stat-item h3 {
    font-size: 2.5rem;
    margin-bottom: 5px;
}

.stat-item p {
    font-size: 0.95rem;
    opacity: 0.9;
}

/* Contact */
.contact {
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px;
    background: white;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.contact-item i {
    font-size: 2rem;
    color: #4a90e2;
    margin-bottom: 15px;
}

/* WeChat icon image styles */
.wechat-icon {
    width: 2rem;
    height: 2rem;
    object-fit: contain;
    margin-bottom: 15px;
    filter: none;
}

.wechat-contact .wechat-icon {
    width: 2rem;
    height: 2rem;
    object-fit: contain;
    margin-bottom: 15px;
}

/* WeChat QR Code Styles */
.wechat-contact {
    text-align: center;
}

.wechat-qr {
    margin-top: 10px;
}

.qr-code {
    width: 120px;
    height: 120px;
    object-fit: contain;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    margin-bottom: 10px;
    display: block;
    margin-left: auto;
    margin-right: auto;
    opacity: 0;
    transition: opacity 0.3s ease;
    loading: lazy;
}

.qr-code[style*="opacity: 1"] {
    opacity: 1;
}

.wechat-qr p {
    font-size: 0.9rem;
    color: #666;
    margin: 0;
}

/* Performance optimizations */
* {
    will-change: auto;
}

.hero-slide img,
.gallery-item img,
.product-image img {
    loading: lazy;
    image-rendering: optimizeQuality;
}

/* Preload important images */
.company-logo {
    loading: eager;
}

/* Reduce layout shift */
.hero-slide {
    contain: layout style paint;
}

.modal {
    contain: layout style paint;
}

/* Scroll optimization */
.nav-list,
.hero-indicators,
.category-tabs {
    contain: layout;
}

/* GPU acceleration for animations */
.hero-slide,
.indicator,
.feature,
.type-card,
.material-card,
.length-card {
    transform: translateZ(0);
    backface-visibility: hidden;
    perspective: 1000px;
}

/* All Products Header Styles */
.all-products-header {
    text-align: center;
    margin-bottom: 40px;
    padding: 30px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

.all-products-header h3 {
    font-size: 2rem;
    color: #333;
    margin-bottom: 15px;
    font-weight: 700;
}

.all-products-header p {
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 25px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

.view-all-products-btn {
    background: linear-gradient(135deg, #4a90e2 0%, #357abd 100%);
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(74, 144, 226, 0.3);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.view-all-products-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(74, 144, 226, 0.4);
    background: linear-gradient(135deg, #357abd 0%, #2968a3 100%);
}

.type-icon {
    font-size: 3rem;
    margin-bottom: 15px;
    display: block;
}

.contact-item h4 {
    font-size: 1.1rem;
    margin-bottom: 5px;
    color: #333;
}

.contact-item p {
    color: #666;
    font-size: 0.95rem;
}

.contact-form {
    background: white;
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #4a90e2;
}

/* Footer */
.footer {
    background: #1a1a1a;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 20px;
    color: #4a90e2;
}

.footer-section p {
    color: #ccc;
    line-height: 1.8;
    margin-bottom: 20px;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul li a {
    color: #ccc;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: #4a90e2;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: #4a90e2;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background 0.3s ease;
}

.social-links a:hover {
    background: #357abd;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #333;
    color: #999;
}

.footer-bottom a {
    color: #4a90e2;
    text-decoration: none;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
}

.modal-content {
    background-color: white;
    margin: 5% auto;
    padding: 20px;
    border-radius: 15px;
    width: 90%;
    max-width: 800px;
    position: relative;
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    position: absolute;
    right: 20px;
    top: 15px;
}

.close:hover {
    color: #000;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-list {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .section-header h2 {
        font-size: 2rem;
    }
    
    .intro-features {
        grid-template-columns: 1fr;
    }
    
    .category-tabs {
        justify-content: center;
        gap: 10px;
        flex-wrap: wrap;
    }
    
    .category-btn {
        padding: 10px 20px;
        font-size: 0.9rem;
        min-width: 100px;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .about-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px;
    }
    
    /* Mobile-specific improvements */
    .hero-content {
        padding: 0 20px;
    }
    
    .material-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .length-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
    
    .gallery-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .modal-content {
        width: 95%;
        margin: 10% auto;
        padding: 15px;
        max-height: 80vh;
        overflow-y: auto;
    }
    
    .product-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)) !important;
        gap: 15px !important;
    }
    
    .view-all-products-btn {
        padding: 12px 20px;
        font-size: 1rem;
    }
    
    /* Touch improvements */
    .btn, .category-btn, .view-products-btn {
        min-height: 44px;
        min-width: 44px;
    }
    
    /* Mobile menu improvements */
    .nav-list.mobile-open {
        max-height: calc(100vh - 80px);
        overflow-y: auto;
    }
    
    .nav-list.mobile-open .nav-link {
        padding: 15px 0;
        font-size: 1.1rem;
        border-bottom: 1px solid #f0f0f0;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    section {
        padding: 60px 0;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .material-grid,
    .length-grid {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

/* Animation */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.8s ease-out;
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}