* {
    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: #f5f7fa;
}

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

/* Navigation */
.navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: white;
}

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

.nav-links a {
    color: white;
    text-decoration: none;
    transition: opacity 0.3s;
    font-weight: 500;
}

.nav-links a:hover,
.nav-links a.active {
    opacity: 0.8;
}

.nav-links a.lang-switch {
    padding: 0.3rem 0.8rem;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    font-size: 0.9rem;
}

.nav-links a.lang-switch:hover {
    background: rgba(255, 255, 255, 0.3);
    opacity: 1;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 5rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero .subtitle {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    opacity: 0.95;
}

.hero .description {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Features Section */
.features {
    padding: 4rem 0;
    background: white;
}

.features h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
    color: #333;
}

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

.feature-card {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 12px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

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

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: #667eea;
}

.feature-card p {
    color: #666;
}

/* Highlights Section */
.highlights {
    padding: 4rem 0;
    background: #f8f9fa;
}

.highlights h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
    color: #333;
}

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

.highlight-item {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    border-left: 4px solid #667eea;
}

.highlight-item h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: #333;
}

.highlight-item p {
    color: #666;
}

/* Content Page */
.content-page {
    background: white;
    min-height: calc(100vh - 200px);
    padding: 3rem 0;
}

.content-page h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    color: #333;
}

.update-date {
    color: #999;
    margin-bottom: 2rem;
    font-size: 0.9rem;
}

.content-page section {
    margin-bottom: 2.5rem;
}

.content-page h2 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: #667eea;
    border-bottom: 2px solid #667eea;
    padding-bottom: 0.5rem;
}

.content-page h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: #333;
}

.content-page p {
    margin-bottom: 1rem;
    color: #555;
    line-height: 1.8;
}

.content-page ul {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

.content-page li {
    margin-bottom: 0.5rem;
    color: #555;
}

/* FAQ Items */
.faq-item {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.faq-item h3 {
    color: #667eea;
    margin-bottom: 0.5rem;
}

/* Feature Details */
.feature-detail {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    border-left: 4px solid #667eea;
}

.feature-detail h3 {
    color: #333;
    margin-bottom: 0.5rem;
}

/* Troubleshooting */
.troubleshooting {
    background: #fff3cd;
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    border-left: 4px solid #ffc107;
}

.troubleshooting h3 {
    color: #856404;
    margin-bottom: 0.5rem;
}

.troubleshooting ul {
    margin-left: 1.5rem;
}

/* Footer */
.footer {
    background: #2c3e50;
    color: white;
    padding: 2rem 0;
    text-align: center;
}

.footer-links {
    margin-top: 1rem;
    display: flex;
    justify-content: center;
    gap: 2rem;
}

.footer-links a {
    color: white;
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.3s;
}

.footer-links a:hover {
    opacity: 1;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        gap: 1rem;
        font-size: 0.9rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero .subtitle {
        font-size: 1.2rem;
    }

    .feature-grid,
    .highlight-list {
        grid-template-columns: 1fr;
    }

    .content-page h1 {
        font-size: 2rem;
    }

    .content-page h2 {
        font-size: 1.5rem;
    }
}