/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

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

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

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: all 0.3s ease;
    background: transparent;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    padding: 15px 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
    transition: color 0.3s ease;
}

.navbar.scrolled .logo {
    color: #1e3a5f;
}

.logo-icon {
    font-size: 2rem;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 40px;
}

.nav-links a {
    text-decoration: none;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
    font-size: 1rem;
    transition: color 0.3s ease;
    position: relative;
}

.navbar.scrolled .nav-links a {
    color: #1e3a5f;
}

.nav-links a:hover {
    color: #60a5fa;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #60a5fa;
    transition: width 0.3s ease;
}

.nav-links a:hover::after {
    width: 100%;
}

/* Hero 区域 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #2563eb 100%);
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(59, 130, 246, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(147, 197, 253, 0.2) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(37, 99, 235, 0.2) 0%, transparent 40%);
    animation: float 15s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(1deg); }
}

.hero-content {
    text-align: center;
    z-index: 1;
    padding: 0 20px;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    color: #fff;
    margin-bottom: 24px;
    letter-spacing: 0.05em;
    text-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 40px;
    font-weight: 300;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.btn-primary {
    display: inline-block;
    padding: 16px 48px;
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    color: #fff;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    border-radius: 50px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 20px rgba(37, 99, 235, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(37, 99, 235, 0.5);
}

/* 通用标题样式 */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 60px;
    color: #1e3a5f;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, #3b82f6, #60a5fa);
    margin: 20px auto 0;
    border-radius: 2px;
}

/* 关于我们 */
.about {
    padding: 120px 0;
    background: #f8fafc;
}

.about-content {
    max-width: 800px;
    margin: 0 auto 60px;
    text-align: center;
}

.about-content p {
    font-size: 1.125rem;
    color: #64748b;
    margin-bottom: 20px;
    line-height: 1.8;
}

.stats {
    display: flex;
    justify-content: center;
    gap: 80px;
    flex-wrap: wrap;
}

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

.stat-number {
    display: block;
    font-size: 3rem;
    font-weight: 700;
    color: #2563eb;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 1rem;
    color: #64748b;
}

/* 核心服务 */
.services {
    padding: 120px 0;
    background: #fff;
}

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

.service-card {
    background: #fff;
    padding: 50px 40px;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: 1px solid #e2e8f0;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 50px rgba(37, 99, 235, 0.15);
    border-color: #93c5fd;
}

.service-icon {
    font-size: 3.5rem;
    margin-bottom: 24px;
}

.service-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #1e3a5f;
    margin-bottom: 16px;
}

.service-card p {
    font-size: 1rem;
    color: #64748b;
    line-height: 1.7;
}

/* 联系我们 */
.contact {
    padding: 120px 0;
    background: linear-gradient(135deg, #0f172a 0%, #1e3a5f 100%);
}

.contact .section-title {
    color: #fff;
}

.contact .section-title::after {
    background: linear-gradient(90deg, #60a5fa, #93c5fd);
}

.contact-content {
    max-width: 800px;
    margin: 0 auto;
}

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

.contact-item {
    display: flex;
    align-items: center;
    gap: 24px;
    background: rgba(255, 255, 255, 0.1);
    padding: 30px 40px;
    border-radius: 12px;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.contact-item:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateX(10px);
}

.contact-icon {
    font-size: 2rem;
}

.contact-item h4 {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.7);
    font-weight: 400;
    margin-bottom: 8px;
}

.contact-item p {
    font-size: 1.25rem;
    color: #fff;
    font-weight: 500;
}

/* 页脚 */
.footer {
    background: #0a0f1a;
    padding: 40px 0;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 600;
    color: #fff;
}

.copyright {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.875rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .stats {
        gap: 40px;
    }
    
    .stat-number {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .contact-item {
        flex-direction: column;
        text-align: center;
        gap: 16px;
        padding: 24px;
    }
    
    .contact-item:hover {
        transform: translateY(-5px);
    }
}