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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

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

/* Header Styles */
.header {
    background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
    color: white;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
    flex-wrap: nowrap;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo {
    height: 50px;
    width: auto;
    filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.3)) brightness(1.1) contrast(1.2);
    background: rgba(255,255,255,0.1);
    padding: 4px;
    border-radius: 8px;
    border: 1px solid rgba(255,255,255,0.2);
}

.brand-text h1 {
    font-size: 1.8rem;
    font-weight: bold;
    margin-bottom: 0.2rem;
}

.tagline {
    font-size: 0.9rem;
    opacity: 0.9;
    font-style: italic;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 1.5rem;
    white-space: nowrap;
}

.nav-menu a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    padding: 0.5rem 0.8rem;
    border-radius: 5px;
    white-space: nowrap;
    font-size: 0.95rem;
}

.nav-menu a:hover {
    background-color: rgba(255,255,255,0.1);
    color: #e0f2fe;
}

.nav-menu a.active {
    background-color: rgba(255,255,255,0.2);
    color: #e0f2fe;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
    color: white;
    padding: 120px 0 80px;
    text-align: center;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

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

.hero-title {
    font-size: 3.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 3rem;
    opacity: 0.95;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature {
    background: rgba(255,255,255,0.1);
    padding: 2rem;
    border-radius: 10px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.2);
}

.feature h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #f0f8ff;
}

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

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    color: #2c3e50;
    position: relative;
}

.section-title::after {
    content: '';
    width: 80px;
    height: 4px;
    background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
    display: block;
    margin: 1rem auto;
    border-radius: 2px;
}

/* About Section */
.about {
    background: white;
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    align-items: start;
}

.about-text p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    line-height: 1.8;
    text-align: justify;
}

.company-info {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 10px;
    border-left: 4px solid #3b82f6;
}

.company-info h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.company-info ul {
    list-style: none;
}

.company-info li {
    margin-bottom: 0.8rem;
    padding: 0.5rem 0;
    border-bottom: 1px solid #e9ecef;
}

.company-info strong {
    color: #3b82f6;
    min-width: 100px;
    display: inline-block;
}

/* Services Section */
.services {
    background: #f8f9fa;
}

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

.service-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-top: 4px solid #3b82f6;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.service-card h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.service-card p {
    color: #666;
    line-height: 1.6;
}

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

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

.product-card {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    transition: transform 0.3s ease;
    border: 1px solid #dee2e6;
}

.product-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.1);
}

.product-card h3 {
    color: #3b82f6;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.product-card p {
    color: #555;
    line-height: 1.6;
}

/* Cases Section */
.cases {
    background: #f8f9fa;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.case-card {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.case-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.case-card.featured {
    grid-column: span 2;
}

.case-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

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

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

.case-content {
    padding: 1.5rem;
}

.case-content h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.case-content p {
    color: #666;
    line-height: 1.6;
    margin-bottom: 0.5rem;
}

.case-content strong {
    color: #3b82f6;
}

/* Contact Section */
.contact {
    background: white;
}

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

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

.contact-item {
    text-align: center;
    padding: 1.5rem;
    background: #f8f9fa;
    border-radius: 10px;
    border-top: 4px solid #3b82f6;
}

.contact-item h3 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

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

.company-mission {
    background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
    color: white;
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
}

.company-mission h3 {
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.company-mission p {
    line-height: 1.8;
    font-size: 1.1rem;
}

/* Footer */
.footer {
    background: #2c3e50;
    color: white;
    padding: 2rem 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
    align-items: center;
}

.footer-info h3 {
    margin-bottom: 1rem;
    color: #ecf0f1;
}

.footer-info p {
    margin-bottom: 0.5rem;
    opacity: 0.9;
}

.footer-copyright {
    text-align: right;
    opacity: 0.8;
}

/* Medium screen adjustments */
@media (max-width: 1024px) {
    .navbar {
        padding: 1rem 1rem;
    }
    
    .nav-menu {
        gap: 1rem;
    }
    
    .nav-menu a {
        font-size: 0.9rem;
        padding: 0.5rem 0.6rem;
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        padding: 1rem;
        gap: 1rem;
    }
    
    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.8rem;
        text-align: center;
    }
    
    .nav-menu a {
        font-size: 0.9rem;
        padding: 0.4rem 0.6rem;
    }
}
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-features {
        grid-template-columns: 1fr;
    }
    
    .about-content {
        grid-template-columns: 1fr;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .cases-grid {
        grid-template-columns: 1fr;
    }
    
    .case-card.featured {
        grid-column: span 1;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-copyright {
        text-align: center;
    }
    
    .section-title {
        font-size: 2rem;
    }
}

/* Page Header Styles */
.page-header {
    background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
    color: white;
    padding: 120px 0 60px;
    text-align: center;
}

.page-title {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 1rem;
}

.page-subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* Breadcrumb Styles */
.breadcrumb {
    background: #f8f9fa;
    padding: 1rem 0;
}

.breadcrumb-nav {
    color: #666;
}

.breadcrumb-nav a {
    color: #3b82f6;
    text-decoration: none;
}

.breadcrumb-nav a:hover {
    text-decoration: underline;
}

.breadcrumb-nav .current {
    color: #333;
    font-weight: bold;
}

/* Service Features */
.service-features {
    list-style: none;
    margin-top: 1rem;
}

.service-features li {
    padding: 0.3rem 0;
    color: #555;
}

.service-features li:before {
    content: "✓ ";
    color: #3b82f6;
    font-weight: bold;
}

/* Process Steps */
.process-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.process-step {
    text-align: center;
}

.step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    margin: 0 auto 1rem;
}

.process-step h3 {
    color: #333;
    margin-bottom: 0.5rem;
}

/* Commitment Cards */
.commitment-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.commitment-card {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 10px;
    border-left: 4px solid #3b82f6;
}

/* Product Features */
.product-features {
    margin-top: 1rem;
}

.product-features h4 {
    color: #333;
    margin-bottom: 0.5rem;
}

.product-features ul {
    list-style: none;
    margin: 0;
}

.product-features li {
    padding: 0.2rem 0;
    color: #555;
}

.product-features li:before {
    content: "• ";
    color: #3b82f6;
    font-weight: bold;
}

.product-tech {
    margin-top: 1rem;
    padding: 1rem;
    background: #e3f2fd;
    border-radius: 5px;
    font-size: 0.9rem;
    color: #1976d2;
}

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

.advantage-card {
    text-align: center;
    padding: 2rem;
    background: white;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.advantage-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

/* Tech Stack */
.tech-stack-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.tech-category {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 10px;
    border-top: 4px solid #3b82f6;
}

.tech-category h3 {
    color: #333;
    margin-bottom: 1rem;
}

.tech-category ul {
    list-style: none;
    margin: 0;
}

.tech-category li {
    padding: 0.3rem 0;
    color: #555;
    border-bottom: 1px solid #e9ecef;
}

/* Case Tags */
.case-tags {
    margin-top: 1rem;
}

.tag {
    display: inline-block;
    background: #e3f2fd;
    color: #1976d2;
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
    margin: 0.2rem;
}

/* Filter Buttons */
.categories-filter {
    text-align: center;
    margin-top: 2rem;
}

.filter-btn {
    background: white;
    color: #666;
    border: 1px solid #ddd;
    padding: 0.8rem 1.5rem;
    margin: 0.3rem;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.filter-btn:hover,
.filter-btn.active {
    background: #3b82f6;
    color: white;
    border-color: #3b82f6;
}

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

.stat-card {
    text-align: center;
    background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
    color: white;
    padding: 2rem;
    border-radius: 10px;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.stat-label {
    opacity: 0.9;
}

/* Testimonials */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.testimonial-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: relative;
}

.testimonial-author {
    margin-top: 1rem;
    color: #3b82f6;
    font-weight: bold;
    text-align: right;
}

/* Contact Form */
.contact-form {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: #333;
    font-weight: bold;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.1);
}

.submit-btn {
    background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
    color: white;
    padding: 1rem 2rem;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: bold;
    transition: transform 0.2s ease;
}

.submit-btn:hover {
    transform: translateY(-2px);
}

/* Contact Info Items */
.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: white;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.contact-icon {
    font-size: 1.5rem;
    width: 40px;
    text-align: center;
}

.contact-details h3 {
    color: #333;
    margin-bottom: 0.5rem;
}

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

.promise-card {
    text-align: center;
    padding: 2rem;
    background: white;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.promise-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

/* Process Timeline */
.process-timeline {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.process-timeline .process-step {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.process-timeline .step-number {
    width: 40px;
    height: 40px;
    margin: 0;
    font-size: 1.2rem;
}

.step-content h3 {
    margin-bottom: 0.5rem;
}

/* Mission Values */
.mission-values {
    margin-top: 2rem;
}

.value-item {
    padding: 1rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.2);
}

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

/* Company Values and Departments */
.values-grid,
.departments-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.value-card,
.department-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    border-left: 4px solid #3b82f6;
}

.value-card h3,
.department-card h3 {
    color: #3b82f6;
    margin-bottom: 1rem;
}

/* Button Styles */
.btn-primary,
.btn-secondary {
    display: inline-block;
    padding: 0.8rem 2rem;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.btn-secondary {
    background: #f8f9fa;
    color: #666;
    border: 1px solid #ddd;
}

.btn-secondary:hover {
    background: #e9ecef;
    color: #333;
}

/* Case Detail Styles */
.case-detail {
    padding: 2rem 0;
}

.case-header {
    margin-bottom: 2rem;
}

.case-title {
    font-size: 2rem;
    color: #333;
    margin-bottom: 1rem;
}

.case-meta {
    color: #666;
    font-size: 1.1rem;
}

.case-description,
.case-features,
.case-technologies,
.case-impact {
    margin-bottom: 2rem;
}

.case-features ul {
    list-style: none;
    margin-top: 1rem;
}

.case-features li {
    padding: 0.5rem 0;
    border-bottom: 1px solid #f0f0f0;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

.tech-tag {
    background: linear-gradient(135deg, #1e40af 0%, #3b82f6 100%);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
}

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

.gallery-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 10px;
    cursor: pointer;
    transition: transform 0.3s ease;
}

.gallery-item img:hover {
    transform: scale(1.05);
}

.case-navigation {
    margin-top: 3rem;
    text-align: center;
}

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

.error-message {
    text-align: center;
    padding: 3rem;
    background: #f8f9fa;
    border-radius: 10px;
}

@media (max-width: 480px) {
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    section {
        padding: 60px 0;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .service-card, .product-card {
        padding: 1.5rem;
    }
    
    .case-content {
        padding: 1rem;
    }
}