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

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
}

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

.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.logo {
    font-size: 24px;
    font-weight: bold;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

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

.nav-menu a:hover {
    opacity: 0.8;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

.mobile-menu-btn span {
    width: 25px;
    height: 3px;
    background: white;
    border-radius: 2px;
}

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

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

.hero p {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.btn {
    padding: 15px 40px;
    border: none;
    border-radius: 30px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background: #ff6b6b;
    color: white;
}

.btn-primary:hover {
    background: #ee5a5a;
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(238, 90, 90, 0.4);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.btn-secondary:hover {
    background: white;
    color: #667eea;
}

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

.section-title h2 {
    font-size: 36px;
    color: #333;
    margin-bottom: 15px;
}

.section-title p {
    color: #666;
    font-size: 18px;
}

.about {
    padding: 80px 0;
    background: #f8f9fa;
}

.about-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.about-item {
    text-align: center;
    padding: 40px 20px;
    background: white;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    transition: transform 0.3s;
}

.about-item:hover {
    transform: translateY(-10px);
}

.about-item .icon {
    font-size: 60px;
    margin-bottom: 20px;
}

.about-item h3 {
    font-size: 24px;
    margin-bottom: 15px;
    color: #333;
}

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

.courses {
    padding: 80px 0;
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.course-card {
    background: white;
    border-radius: 15px;
    padding: 40px 30px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    position: relative;
    transition: transform 0.3s, box-shadow 0.3s;
}

.course-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.15);
}

.course-card.featured {
    border: 3px solid #667eea;
    transform: scale(1.05);
}

.course-card.featured:hover {
    transform: scale(1.05) translateY(-10px);
}

.course-badge {
    position: absolute;
    top: -15px;
    right: 30px;
    background: #ff6b6b;
    color: white;
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
}

.course-card h3 {
    font-size: 26px;
    margin-bottom: 20px;
    color: #333;
}

.course-price {
    font-size: 36px;
    font-weight: bold;
    color: #667eea;
    margin-bottom: 30px;
}

.course-features {
    list-style: none;
    margin-bottom: 30px;
}

.course-features li {
    padding: 10px 0;
    color: #666;
    border-bottom: 1px solid #eee;
}

.course-features li:last-child {
    border-bottom: none;
}

.benefits {
    padding: 80px 0;
    background: #f8f9fa;
}

.benefits-list {
    max-width: 900px;
    margin: 0 auto;
}

.benefit-item {
    display: flex;
    gap: 30px;
    margin-bottom: 40px;
    align-items: flex-start;
}

.benefit-item .number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: bold;
    flex-shrink: 0;
}

.benefit-content h3 {
    font-size: 24px;
    margin-bottom: 10px;
    color: #333;
}

.benefit-content p {
    color: #666;
    font-size: 16px;
}

.contact {
    padding: 80px 0;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.contact-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.contact-item .icon {
    font-size: 40px;
    flex-shrink: 0;
}

.contact-item h4 {
    font-size: 18px;
    margin-bottom: 5px;
    color: #333;
}

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

.contact-form {
    background: #f8f9fa;
    padding: 40px;
    border-radius: 15px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #667eea;
}

.footer {
    background: #333;
    color: white;
    padding: 40px 0;
    text-align: center;
}

.footer-logo {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 15px;
}

.footer p {
    opacity: 0.8;
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .hero h1 {
        font-size: 32px;
    }
    
    .hero p {
        font-size: 16px;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .section-title h2 {
        font-size: 28px;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .course-card.featured {
        transform: scale(1);
    }
}