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

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

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

nav {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.logo {
    font-size: 1.3rem;
    font-weight: bold;
    color: #1a5490;
    text-decoration: none;
    white-space: nowrap;
}

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

.nav-menu li {
    position: relative;
}

.nav-menu a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
    padding: 0.5rem 1rem;
    display: block;
}

.nav-menu a:hover {
    color: #1a5490;
}

/* Dropdown Menu */
.dropdown {
    position: relative;
}

.dropdown > a {
    display: block;
}

.dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    min-width: 220px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.1);
    border-radius: 8px;
    overflow: hidden;
    margin-top: 0;
    padding-top: 0.5rem;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.dropdown:hover .dropdown-content,
.dropdown-content:hover {
    display: block;
}

.dropdown-content::before {
    content: '';
    position: absolute;
    top: -0.5rem;
    left: 0;
    right: 0;
    height: 0.5rem;
    background: transparent;
}

.dropdown-content a {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid #f0f0f0;
    display: block;
    width: 100%;
}

.dropdown-content a:last-child {
    border-bottom: none;
}

.dropdown-content a:hover {
    background: #f8f9fa;
}

/* Hero Section */
.hero {
    margin-top: 80px;
    height: 90vh;
    position: relative;
    overflow: hidden;
}

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

.hero-slide {
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s ease-in-out;
}

.hero-slide.active {
    opacity: 1;
}

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

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(26, 84, 144, 0.8), rgba(0, 0, 0, 0.5));
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    color: white;
    text-align: center;
    padding: 2rem;
}

.hero-overlay h1 {
    font-size: 4rem;
    margin-bottom: 1rem;
    animation: fadeInUp 1s ease;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-overlay p {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    opacity: 0.95;
    animation: fadeInUp 1.2s ease;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: #ff6b35;
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: bold;
    transition: all 0.3s ease;
    animation: fadeInUp 1.4s ease;
}

.cta-button:hover {
    background: #e55a2b;
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(255, 107, 53, 0.3);
}

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

/* Section Styles */
section {
    padding: 5rem 2rem;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #1a5490;
    position: relative;
    padding-bottom: 1rem;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: #ff6b35;
}

.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 3rem;
}

/* About Section */
.about {
    background: #f8f9fa;
}

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

.about-text h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: #1a5490;
}

.about-text p {
    margin-bottom: 1rem;
    line-height: 1.8;
    color: #555;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 2rem;
}

.stat-item {
    text-align: center;
    padding: 1.5rem;
    background: white;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: #ff6b35;
}

.stat-label {
    color: #666;
    margin-top: 0.5rem;
}

/* Services Section */
.services-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

.service-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    cursor: pointer;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.2);
}

.service-icon {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #1a5490, #2d6ba8);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    color: white;
}

.service-content {
    padding: 1.5rem;
}

.service-content h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #1a5490;
}

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

.service-link {
    display: inline-block;
    color: #ff6b35;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s ease;
}

.service-link:hover {
    color: #e55a2b;
}

/* Projects Section */
.projects {
    background: #f8f9fa;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

.project-card {
    position: relative;
    overflow: hidden;
    border-radius: 15px;
    height: 300px;
    cursor: pointer;
}

.project-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.project-card:hover img {
    transform: scale(1.1);
}

.project-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
    color: white;
    padding: 2rem;
    transform: translateY(100%);
    transition: transform 0.3s ease;
}

.project-card:hover .project-overlay {
    transform: translateY(0);
}

.project-overlay h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
}

.project-overlay p {
    font-size: 0.9rem;
}

/* News Section */
.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-top: 3rem;
}

.news-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

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

.news-date {
    background: #1a5490;
    color: white;
    padding: 1rem;
    text-align: center;
}

.news-content {
    padding: 1.5rem;
}

.news-content h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: #333;
}

.news-content p {
    color: #666;
    font-size: 0.95rem;
}

/* Contact Section */
.contact {
    background: linear-gradient(135deg, #1a5490, #2d6ba8);
    color: white;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3rem;
    margin-top: 3rem;
}

.contact-item {
    text-align: center;
    padding: 2rem;
    background: rgba(255,255,255,0.1);
    border-radius: 15px;
    backdrop-filter: blur(10px);
}

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

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

.contact-item p {
    font-size: 1.1rem;
}

/* Footer */
footer {
    background: #1a1a1a;
    color: white;
    padding: 3rem 2rem 1rem;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    margin-bottom: 1rem;
    color: #ff6b35;
}

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

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

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

.footer-section a:hover {
    color: #ff6b35;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #333;
    color: #888;
}

/* Responsive */
@media (max-width: 768px) {
    .logo {
        font-size: 1rem;
    }
    
    .nav-menu {
        flex-direction: column;
        gap: 1rem;
    }
    
    .hero-overlay h1 {
        font-size: 2.5rem;
    }
    
    .hero-overlay p {
        font-size: 1.2rem;
    }
    
    .about-content,
    .services-grid,
    .projects-grid,
    .news-grid,
    .contact-grid,
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 1200px) and (min-width: 769px) {
    .services-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}