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

html {
    scroll-behavior: smooth;
}

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

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 2rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 1rem;
    color: #666;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    min-width: 120px;
}

.btn-primary {
    background: linear-gradient(135deg, #0066ff, #0052cc);
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #0052cc, #003d99);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 102, 255, 0.3);
}

.btn-outline {
    background: transparent;
    color: #0066ff;
    border: 2px solid #0066ff;
}

.btn-outline:hover {
    background: #0066ff;
    color: white;
    transform: translateY(-2px);
}

.btn-secondary {
    background: #f8f9fa;
    color: #333;
    border: 1px solid #dee2e6;
}

.btn-secondary:hover {
    background: #e9ecef;
    transform: translateY(-2px);
}

/* Header */
.header {
    background: white;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
}

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

.logo img {
    height: 40px;
    width: auto;
}

.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-item.active .nav-link {
    color: #0066ff;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #0066ff;
    transition: width 0.3s ease;
}

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

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Language Selector */
.language-selector {
    position: relative;
    cursor: pointer;
}

.lang-current {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    border-radius: 6px;
    transition: background-color 0.3s ease;
}

.lang-current:hover {
    background-color: #f8f9fa;
}

.lang-current img {
    width: 20px;
    height: 15px;
    border-radius: 2px;
}

.lang-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    border: 1px solid #dee2e6;
    border-radius: 6px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    min-width: 150px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1001;
}

.language-selector:hover .lang-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.lang-option:hover {
    background-color: #f8f9fa;
}

.lang-option img {
    width: 20px;
    height: 15px;
    border-radius: 2px;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: #333;
    transition: all 0.3s ease;
}

/* Hero Section */
.hero {
    margin-top: 80px;
    position: relative;
    height: 600px;
    overflow: hidden;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.hero-slide {
    position: relative;
    height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-slide img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
    opacity: 0.3;
    mix-blend-mode: overlay;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
    max-width: 800px;
    padding: 0 2rem;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: white;
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    color: rgba(255, 255, 255, 0.95);
    text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.2);
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Product Categories */
.product-categories {
    padding: 4rem 0;
    background: linear-gradient(to bottom, #ffffff, #f0f4ff);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.category-card {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    cursor: pointer;
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

.category-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1rem;
    background: linear-gradient(135deg, #0066ff, #0052cc);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
}

.category-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 0.5rem;
}

/* Featured Products */
.featured-products {
    padding: 4rem 0;
}

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

.section-title {
    font-size: 2.5rem;
    color: #333;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.125rem;
    color: #666;
    max-width: 600px;
    margin: 0 auto;
}

.products-slider {
    position: relative;
    padding: 2rem 0;
}

.product-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    cursor: pointer;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

.product-image {
    position: relative;
    height: 250px;
    overflow: hidden;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: #f8f9fa;
    transition: transform 0.3s ease;
}

.product-card:hover .product-image img {
    transform: scale(1.05);
}

.product-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 102, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.product-card:hover .product-overlay {
    opacity: 1;
}

.product-overlay-content {
    text-align: center;
    color: white;
    padding: 1rem;
}

.product-overlay-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.product-overlay-description {
    font-size: 0.9rem;
    opacity: 0.9;
}

.product-info {
    padding: 1.5rem;
}

.product-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 0.5rem;
}

.product-category {
    color: #0066ff;
    font-size: 0.9rem;
    font-weight: 500;
}

.section-footer {
    text-align: center;
    margin-top: 3rem;
}

/* Swiper Navigation */
.swiper-button-next,
.swiper-button-prev {
    color: #0066ff;
    background: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.swiper-button-next:hover,
.swiper-button-prev:hover {
    background: #0066ff;
    color: white;
    transform: scale(1.1);
}

.swiper-button-next::after,
.swiper-button-prev::after {
    font-size: 20px;
}

/* Statistics */
.statistics {
    padding: 4rem 0;
    background: linear-gradient(135deg, #0066ff, #0052cc);
    color: white;
}

.stats-content {
    text-align: center;
}

.stats-title {
    font-size: 2.5rem;
    margin-bottom: 3rem;
    opacity: 0.9;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stat-number span {
    font-size: 2rem;
    opacity: 0.8;
}

.stat-label {
    font-size: 1.125rem;
    opacity: 0.9;
}

/* Projects */
.projects {
    padding: 4rem 0;
    background: #f8f9fa;
}

.project-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
}

.tab-btn {
    padding: 0.75rem 2rem;
    border: 2px solid #0066ff;
    background: transparent;
    color: #0066ff;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
}

.tab-btn.active,
.tab-btn:hover {
    background: #0066ff;
    color: white;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.project-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    cursor: pointer;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

.project-image {
    height: 200px;
    overflow: hidden;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.project-card:hover .project-image img {
    transform: scale(1.05);
}

.project-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: #0066ff;
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
    z-index: 2;
}

.project-type-overseas {
    background: #28a745;
}

.project-type-domestic {
    background: #ffc107;
    color: #333;
}

.project-info {
    padding: 1.5rem;
}

.project-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 0.5rem;
}

.project-client {
    color: #666;
    font-size: 0.9rem;
}

/* Contact */
.contact {
    padding: 4rem 0;
    background: #f8f9fa;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.contact-info h2 {
    font-size: 2rem;
    color: #333;
    margin-bottom: 1rem;
}

.contact-info p {
    font-size: 1.125rem;
    margin-bottom: 2rem;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.contact-item i {
    color: #0066ff;
    font-size: 1.25rem;
    width: 20px;
}

.contact-form {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid #e9ecef;
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #0066ff;
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* Footer */
.footer {
    background: #1a1a1a;
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    color: white;
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.footer-logo img {
    height: 40px;
    margin-bottom: 1rem;
}

.footer-contact p {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    color: #ccc;
}

.footer-contact i {
    color: #0066ff;
    width: 16px;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: #333;
    color: white;
    border-radius: 50%;
    text-decoration: none;
    transition: all 0.3s ease;
}

.social-link:hover {
    background: #0066ff;
    transform: translateY(-2px);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

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

.footer-links a:hover {
    color: #0066ff;
}

.footer-bottom {
    border-top: 1px solid #333;
    padding-top: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-copyright {
    color: #ccc;
}

.footer-legal {
    display: flex;
    gap: 2rem;
}

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

.footer-legal a:hover {
    color: #0066ff;
}

/* Back to Top */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: #0066ff;
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(0, 102, 255, 0.3);
    transition: all 0.3s ease;
    opacity: 0;
    visibility: hidden;
    z-index: 1000;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: #0052cc;
    transform: translateY(-2px);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .nav {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .categories-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .project-tabs {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .stat-number {
        font-size: 2.5rem;
    }
}

/* Loading and Error States */
.loading, .no-data, .error {
    text-align: center;
    padding: 2rem;
    font-size: 1.1rem;
    color: #838282;
    background: #f8f9fa;
    border-radius: 8px;
    margin: 1rem 0;
}

.loading {
    color: #007bff;
}

.loading::after {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid #007bff;
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 1s linear infinite;
    margin-left: 10px;
    vertical-align: middle;
}

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

.error {
    color: #dc3545;
    background: #f8d7da;
    border: 1px solid #f5c6cb;
}

.no-data {
    color: #6c757d;
    background: #e9ecef;
    border: 1px solid #dee2e6;
}

/* Quality Section */
.quality {
    padding: 6rem 0;
    background: linear-gradient(to bottom, #ffffff, #f8faff);
}

.quality-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-top: 4rem;
}

.quality-item {
    text-align: center;
    padding: 2rem;
    background: white;
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.quality-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

.quality-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #0066ff, #0052cc);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

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

.quality-item h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 1rem;
}

.quality-item p {
    color: #666;
    line-height: 1.6;
}

/* Service Section */
.service {
    padding: 6rem 0;
    background: white;
}

.service-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 3rem;
    margin-top: 4rem;
}

.service-item {
    padding: 2.5rem;
    background: linear-gradient(135deg, #ffffff, #f0f4ff);
    border-radius: 12px;
    border: 1px solid #e0e8ff;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.service-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 102, 255, 0.15);
    background: linear-gradient(135deg, #ffffff, #f8faff);
}

.service-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, #28a745, #20c997);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.service-icon i {
    font-size: 1.8rem;
    color: white;
}

.service-item h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 1rem;
}

.service-item p {
    color: #666;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.service-features {
    list-style: none;
    padding: 0;
}

.service-features li {
    padding: 0.5rem 0;
    color: #666;
    position: relative;
    padding-left: 1.5rem;
}

.service-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #28a745;
    font-weight: bold;
}

/* About Section */
.about {
    padding: 6rem 0;
    background: linear-gradient(to bottom, #f8faff, #ffffff);
}

.about-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    margin-top: 4rem;
}

.about-text h3 {
    font-size: 1.8rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 1rem;
    margin-top: 2rem;
}

.about-text h3:first-child {
    margin-top: 0;
}

.about-text p {
    color: #666;
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.about-features {
    list-style: none;
    padding: 0;
    margin: 1.5rem 0;
}

.about-features li {
    padding: 0.75rem 0;
    color: #666;
    display: flex;
    align-items: center;
}

.about-features li i {
    color: #28a745;
    margin-right: 0.75rem;
    font-size: 0.9rem;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.about-stats .stat-item {
    text-align: center;
    padding: 2rem;
    background: white;
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.about-stats .stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: #0066ff;
    margin-bottom: 0.5rem;
}

.about-stats .stat-label {
    color: #666;
    font-size: 0.9rem;
    font-weight: 500;
}

.news-section {
    margin-top: 4rem;
    padding-top: 3rem;
    border-top: 1px solid #e9ecef;
}

.news-section h3 {
    font-size: 1.8rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 2rem;
    text-align: center;
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.news-item {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.news-item:hover {
    transform: translateY(-3px);
}

.news-date {
    color: #0066ff;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.news-item h4 {
    font-size: 1.2rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 1rem;
}

.news-item p {
    color: #666;
    line-height: 1.6;
}

/* Responsive Design for New Sections */
@media (max-width: 768px) {
    .quality-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .service-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .about-stats {
        grid-template-columns: 1fr 1fr;
        gap: 1rem;
    }
    
    .news-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .about-stats {
        grid-template-columns: 1fr;
    }
    
    .quality-item,
    .service-item,
    .news-item {
        padding: 1.5rem;
    }
}