/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

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

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

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

/* 头部导航 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: #fff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

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

.logo img {
    height: 30px;
    width: auto;
}

.logo span {
    font-size: 26px;
    font-weight: 500;
    color: #3a7dd1;
}

.nav ul {
    display: flex;
    gap: 30px;
}

.nav a {
    font-size: 15px;
    color: #666;
    transition: color 0.3s;
    padding: 8px 0;
}

.nav a:hover,
.nav a.active {
    color: #3a7dd1;
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.mobile-menu-btn span {
    width: 25px;
    height: 2px;
    background: #333;
    transition: all 0.3s;
}

/* Hero 区域 */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1a3a5c 0%, #2d5a87 50%, #e8a84c 100%);
    background-size: cover;
    background-position: center;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        /* 多层动态光晕 */
        radial-gradient(circle at 20% 30%, rgba(58, 125, 209, 0.4) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(232, 168, 76, 0.3) 0%, transparent 45%),
        radial-gradient(circle at 40% 70%, rgba(100, 200, 255, 0.25) 0%, transparent 55%),
        radial-gradient(circle at 60% 80%, rgba(58, 125, 209, 0.25) 0%, transparent 50%),
        radial-gradient(circle at 10% 60%, rgba(90, 157, 225, 0.2) 0%, transparent 40%),
        radial-gradient(circle at 90% 90%, rgba(45, 90, 135, 0.3) 0%, transparent 45%);
    background-size: 100% 100%, 100% 100%, 100% 100%, 100% 100%, 100% 100%, 100% 100%;
    opacity: 0.6;
    animation: hero-glow 15s ease-in-out infinite;
}

@keyframes hero-glow {
    0%, 100% {
        opacity: 0.6;
        transform: scale(1);
    }
    50% {
        opacity: 0.85;
        transform: scale(1.05);
    }
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: #fff;
    padding: 0 20px;
    max-width: 900px;
}

.hero-subtitle {
    font-size: 20px;
    margin-bottom: 20px;
    opacity: 0.9;
}

.hero-title {
    font-size: 52px;
    font-weight: 700;
    margin-bottom: 50px;
    line-height: 1.3;
}

.hero-title .highlight {
    color: #3a7dd1;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin-top: 40px;
}

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

.stat-circle {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
    border: 2px solid rgba(255, 255, 255, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 15px;
    backdrop-filter: blur(5px);
}

.stat-number {
    font-size: 36px;
    font-weight: 700;
}

.stat-label {
    font-size: 16px;
    opacity: 0.9;
}

/* 核心优势区域 */
.features {
    padding: 80px 0;
    background: #fff;
}

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

.section-header h2 {
    font-size: 32px;
    color: #333;
    margin-bottom: 15px;
    font-weight: 500;
}

.section-header p {
    font-size: 16px;
    color: #666;
    max-width: 700px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.feature-card {
    text-align: center;
    padding: 40px 25px;
    border-radius: 8px;
    transition: all 0.3s;
    background: #f8fafc;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(58, 125, 209, 0.15);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 25px;
    color: #3a7dd1;
}

.feature-icon svg {
    width: 100%;
    height: 100%;
}

.feature-card h3 {
    font-size: 18px;
    color: #333;
    margin-bottom: 15px;
    font-weight: 500;
}

.feature-card p {
    font-size: 14px;
    color: #666;
    line-height: 1.8;
}

/* CTA区域 */
.cta-section {
    padding: 60px 0;
    background: linear-gradient(135deg, #e8f2f7 0%, #d5e8f3 100%);
}

.cta-section p {
    text-align: center;
    font-size: 18px;
    color: #555;
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.8;
}

/* 页脚 */
.footer {
    background: #3c3f47;
    color: #fff;
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-column h4 {
    font-size: 18px;
    margin-bottom: 25px;
    font-weight: 500;
    position: relative;
    padding-bottom: 10px;
}

.footer-column h4::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 40px;
    height: 2px;
    background: #3a7dd1;
}

.footer-column ul li {
    margin-bottom: 12px;
}

.footer-column ul a {
    color: #aaa;
    font-size: 14px;
    transition: color 0.3s;
}

.footer-column ul a:hover {
    color: #fff;
}

.contact-info li {
    display: flex;
    font-size: 14px;
    color: #aaa;
}

.contact-label {
    color: #ccc;
    white-space: nowrap;
}

.footer-bottom {
    border-top: 1px solid #555;
    padding-top: 25px;
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: #888;
    margin-bottom: 8px;
}

.footer-bottom a {
    color: #3a7dd1;
    transition: color 0.3s;
}

.footer-bottom a:hover {
    color: #5a9de1;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero-stats {
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #fff;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
        padding: 20px;
    }
    
    .nav.active {
        display: block;
    }
    
    .nav ul {
        flex-direction: column;
        gap: 0;
    }
    
    .nav li {
        border-bottom: 1px solid #eee;
    }
    
    .nav a {
        display: block;
        padding: 15px 0;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero-title {
        font-size: 28px;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 30px;
    }
    
    .stat-circle {
        width: 80px;
        height: 80px;
    }
    
    .stat-number {
        font-size: 22px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .section-header h2 {
        font-size: 24px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 480px) {
    .logo span {
        font-size: 16px;
    }
    
    .hero-title {
        font-size: 24px;
    }
    
    .hero-subtitle {
        font-size: 14px;
    }
    
    .feature-card {
        padding: 30px 20px;
    }
    
    .cta-section p {
        font-size: 16px;
    }
}