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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

/* 导航栏样式 */
.navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.logo h1 {
    color: white;
    font-size: 1.5rem;
}

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

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

.nav-links a:hover {
    color: #ffecd2;
}

/* 主内容区 */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Hero 区域 */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 2rem;
    border-radius: 10px;
    text-align: center;
    margin-bottom: 3rem;
}

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

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

.cta-button {
    background: white;
    color: #667eea;
    border: none;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: bold;
    border-radius: 5px;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}

/* 分区样式 */
.section {
    background: white;
    padding: 3rem 2rem;
    border-radius: 10px;
    margin-bottom: 3rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.section h2 {
    text-align: center;
    color: #667eea;
    margin-bottom: 2rem;
    font-size: 2rem;
}

/* 教程卡片网格 */
.tutorial-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.tutorial-card {
    background: #f9f9f9;
    padding: 2rem;
    border-radius: 8px;
    border-left: 4px solid #667eea;
    transition: transform 0.3s, box-shadow 0.3s;
}

.tutorial-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

.tutorial-card h3 {
    color: #667eea;
    margin-bottom: 1rem;
}

.tutorial-card p {
    color: #666;
    margin-bottom: 1.5rem;
}

.card-link {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
    display: inline-block;
    transition: color 0.3s;
}

.card-link:hover {
    color: #764ba2;
}

/* 示例卡片网格 */
.example-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.example-card {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
    padding: 2rem;
    border-radius: 8px;
    transition: transform 0.3s;
}

.example-card:hover {
    transform: scale(1.05);
}

.example-card h3 {
    margin-bottom: 0.5rem;
}

.example-card p {
    margin-bottom: 1.5rem;
    opacity: 0.9;
}

.example-card .card-link {
    color: white;
}

/* 页脚 */
footer {
    background: #333;
    color: white;
    text-align: center;
    padding: 2rem;
    margin-top: 3rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        gap: 1rem;
    }

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

    .tutorial-grid,
    .example-grid {
        grid-template-columns: 1fr;
    }
}