/* 全局样式 */
:root {
    --primary-color: #000000;
    --secondary-color: #333333;
    --accent-color: #666666;
    --text-color: #333333;
    --light-text: #666666;
    --white: #ffffff;
    --black: #000000;
    --gray: #666666;
    --light-gray: #dddddd;
    --light-bg: #f5f5f5;
    --dark-bg: #222222;
    --shadow: 0 5px 15px rgba(0,0,0,0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* 导航栏样式 */
.navbar {
    background-color: var(--black);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.logo h1 {
    color: var(--white);
    font-size: 1.8rem;
    font-weight: 700;
}

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

.nav-links li {
    margin-left: 2rem;
}

.nav-links a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--light-gray);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--white);
    transition: var(--transition);
}

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

.mobile-menu {
    display: none;
    color: var(--white);
    font-size: 1.5rem;
    cursor: pointer;
}

/* 英雄区域样式 */
.hero {
    height: 100vh;
    background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)),
                url('https://images.unsplash.com/photo-1451187580459-43490279c0fa?ixlib=rb-1.2.1&auto=format&fit=crop&w=1950&q=80') center/cover;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--white);
    padding: 0 1rem;
}

.hero-content {
    max-width: 800px;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
    line-height: 1.2;
}

.hero p {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* 按钮样式 */
.cta-button {
    display: inline-block;
    background-color: var(--white);
    color: var(--black);
    padding: 1rem 2rem;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border: 2px solid var(--white);
}

.cta-button:hover {
    background-color: transparent;
    color: var(--white);
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

.secondary-button {
    display: inline-block;
    background-color: transparent;
    color: var(--white);
    padding: 1rem 2rem;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border: 2px solid var(--white);
}

.secondary-button:hover {
    background-color: var(--white);
    color: var(--black);
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

/* 统计部分样式 */
.stats-section {
    padding: 5rem 0;
    background-color: var(--white);
}

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

.stat-item h2 {
    font-size: 3rem;
    color: var(--black);
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.stat-item p {
    font-size: 1.2rem;
    color: var(--gray);
}

.stats-cta {
    text-align: center;
    margin-top: 3rem;
}

/* 解决方案部分样式 */
.solutions-section {
    padding: 5rem 0;
    background-color: var(--light-bg);
}

.solutions-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--black);
}

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

.solution-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
    border: 1px solid var(--light-gray);
}

.solution-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.15);
}

.solution-icon {
    font-size: 3rem;
    color: var(--black);
    margin-bottom: 1.5rem;
}

.solution-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--black);
}

.solution-card p {
    color: var(--gray);
    margin-bottom: 1.5rem;
}

.learn-more {
    color: var(--black);
    text-decoration: none;
    font-weight: 600;
    display: inline-block;
    transition: var(--transition);
}

.learn-more:hover {
    color: var(--gray);
    transform: translateX(5px);
}

/* 网络部分样式 */
.network-section {
    padding: 5rem 0;
    background-color: var(--white);
    text-align: center;
}

.network-section h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: var(--black);
}

.network-section p {
    max-width: 800px;
    margin: 0 auto 2rem;
    color: var(--gray);
}

.network-cta {
    margin-top: 2rem;
}

/* 特性部分样式 */
.features-section {
    padding: 5rem 0;
    background-color: var(--light-bg);
}

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

.feature-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    text-align: center;
    border: 1px solid var(--light-gray);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.15);
}

.feature-card i {
    font-size: 2.5rem;
    color: var(--black);
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--black);
}

.feature-card p {
    color: var(--gray);
}

/* CTA部分样式 */
.cta-section {
    padding: 5rem 0;
    background-color: var(--white);
    text-align: center;
}

.cta-section h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: var(--black);
}

/* 页脚样式 */
footer {
    background-color: var(--dark-bg);
    color: var(--white);
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-bottom: 2rem;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
    padding: 0 1rem;
}

.footer-section h3 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    position: relative;
    padding-bottom: 0.5rem;
}

.footer-section h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background-color: var(--white);
}

.footer-section p {
    margin-bottom: 0.4rem;
    opacity: 0.8;
    font-size: 0.9rem;
}

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

.footer-section ul li {
    margin-bottom: 0.4rem;
}

.footer-section ul li a {
    color: var(--white);
    text-decoration: none;
    opacity: 0.8;
    transition: var(--transition);
    font-size: 0.9rem;
}

.footer-section ul li a:hover {
    opacity: 1;
    padding-left: 5px;
}

.social-links {
    display: flex;
    gap: 0.8rem;
}

.social-links a {
    color: var(--white);
    font-size: 1.2rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
}

.social-links a:hover {
    background-color: var(--white);
    color: var(--black);
    transform: translateY(-3px);
}

.footer-bottom {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 1rem;
    padding-right: 1rem;
}

.footer-bottom p {
    opacity: 0.7;
    font-size: 0.85rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu {
        display: block;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero p {
        font-size: 1.2rem;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .solutions-grid, .features-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero p {
        font-size: 1rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-section h3::after {
        left: 50%;
        transform: translateX(-50%);
    }
    
    .social-links {
        justify-content: center;
    }
}