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

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

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    z-index: 1000;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-icon {
    font-size: 28px;
}

.logo-text {
    font-size: 22px;
    font-weight: bold;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-link {
    text-decoration: none;
    color: #555;
    font-size: 15px;
    transition: color 0.3s;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: #667eea;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

/* Hero */
.hero {
    padding: 160px 0 100px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    text-align: center;
}

.hero h1 {
    font-size: 48px;
    font-weight: bold;
    margin-bottom: 20px;
}

.hero .subtitle {
    font-size: 20px;
    opacity: 0.95;
    margin-bottom: 40px;
}

.hero-features {
    display: flex;
    justify-content: center;
    gap: 50px;
    flex-wrap: wrap;
}

.hero-feature {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 18px;
    background: rgba(255, 255, 255, 0.2);
    padding: 12px 24px;
    border-radius: 30px;
    backdrop-filter: blur(5px);
}

.hero-icon {
    font-size: 22px;
}

/* Section */
.section-title {
    text-align: center;
    font-size: 32px;
    font-weight: bold;
    margin-bottom: 15px;
    color: #333;
}

.section-desc {
    text-align: center;
    color: #777;
    margin-bottom: 50px;
    font-size: 16px;
}

/* Features */
.features {
    padding: 80px 0;
    background: #f9fafb;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    background: #fff;
    padding: 40px 30px;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    transition: transform 0.3s, box-shadow 0.3s;
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: #333;
}

.feature-card p {
    color: #666;
    font-size: 14px;
    line-height: 1.7;
}

/* About */
.about {
    padding: 80px 0;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text p {
    margin-bottom: 16px;
    color: #555;
    line-height: 1.8;
    font-size: 15px;
}

.about-stats {
    display: flex;
    justify-content: space-around;
}

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

.stat-number {
    font-size: 36px;
    font-weight: bold;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.stat-label {
    color: #888;
    font-size: 14px;
}

/* Contact */
.contact {
    padding: 80px 0;
    background: #f9fafb;
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
}

.contact-item {
    display: flex;
    gap: 16px;
    padding: 30px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.contact-icon {
    font-size: 32px;
    flex-shrink: 0;
}

.contact-item h4 {
    font-size: 16px;
    margin-bottom: 6px;
    color: #333;
}

.contact-item p {
    color: #666;
    font-size: 14px;
}

/* Footer */
.footer {
    background: #2c3e50;
    color: #bbb;
    padding: 40px 0 20px;
}

.footer-links {
    text-align: center;
    margin-bottom: 20px;
}

.footer-links a {
    color: #ccc;
    text-decoration: none;
    margin: 0 8px;
    transition: color 0.3s;
}

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

.footer-links span {
    color: #555;
}

.footer-text {
    text-align: center;
    font-size: 13px;
    line-height: 1.8;
}

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

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

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 32px;
    }

    .hero .subtitle {
        font-size: 16px;
    }

    .hero-features {
        gap: 15px;
    }

    .hero-feature {
        font-size: 14px;
        padding: 8px 16px;
    }

    .nav {
        gap: 15px;
    }

    .nav-link {
        font-size: 14px;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .section-title {
        font-size: 26px;
    }
}