/* 现代简约风格 - 白色+绿色主题 */

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

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

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

/* 导航栏 */
.navbar {
    background: #ffffff;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

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

.logo {
    font-size: 1.5rem;
}

.brand-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: #10b981;
}

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

.nav-menu a {
    text-decoration: none;
    color: #666;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: #10b981;
}

/* 按钮样式 */
.btn-primary {
    background: #10b981;
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    background: #059669;
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: #10b981;
    border: 2px solid #10b981;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
}

.btn-secondary:hover {
    background: #10b981;
    color: white;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    padding: 120px 0 80px;
    margin-top: 60px;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: #6b7280;
    margin-bottom: 2rem;
}

.hero-stats {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: #10b981;
}

.stat-label {
    font-size: 0.9rem;
    color: #6b7280;
}

.hero-actions {
    display: flex;
    gap: 1rem;
}

/* 网络图形 */
.network-graphic {
    position: relative;
    height: 300px;
    background: #f8fafc;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.node {
    width: 20px;
    height: 20px;
    background: #10b981;
    border-radius: 50%;
    position: absolute;
    animation: float 3s ease-in-out infinite;
}

.node:nth-child(1) { top: 30%; left: 20%; animation-delay: 0s; }
.node:nth-child(2) { top: 60%; left: 70%; animation-delay: 1s; }
.node:nth-child(3) { top: 20%; left: 80%; animation-delay: 2s; }

.connection {
    position: absolute;
    height: 2px;
    background: #10b981;
    width: 60%;
    opacity: 0.3;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

/* 功能特色 */
.features {
    padding: 80px 0;
    background: white;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 3rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(16, 185, 129, 0.15);
}

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

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 1rem;
}

.feature-card p {
    color: #6b7280;
    line-height: 1.6;
}

/* 页脚 */
.footer {
    background: #1f2937;
    color: white;
    padding: 60px 0 20px;
}

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

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
    color: #10b981;
}

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

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

.footer-section a {
    color: #d1d5db;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: #10b981;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #374151;
    color: #9ca3af;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .nav-menu {
        display: none;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
}