/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

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

/* 头部样式 */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 2rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="40" fill="none" stroke="white" stroke-width="0.5" opacity="0.1"/></svg>') repeat;
    opacity: 0.3;
}

.logo {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    position: relative;
    z-index: 1;
}

.tagline {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 2rem;
    position: relative;
    z-index: 1;
}

/* 导航按钮 */
.nav-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    background: white;
    color: #667eea;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    background: #f8f9fa;
}

.btn-primary {
    background: #4f46e5;
    color: white;
}

.btn-primary:hover {
    background: #4338ca;
}

/* 主要内容区域 */
main {
    padding: 3rem 0;
}

.section {
    margin-bottom: 3rem;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    color: #4f46e5;
    margin-bottom: 2rem;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: #4f46e5;
    margin: 0.5rem auto;
    border-radius: 2px;
}

/* 特性网格 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    text-align: center;
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 2.5rem;
    color: #4f46e5;
    margin-bottom: 1rem;
}

.feature-title {
    font-size: 1.3rem;
    color: #333;
    margin-bottom: 1rem;
}

.feature-desc {
    color: #666;
    font-size: 0.95rem;
}

/* 页脚 */
footer {
    background: #1f2937;
    color: white;
    padding: 2rem 0;
    text-align: center;
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin: 1.5rem 0;
    flex-wrap: wrap;
}

.footer-links a {
    color: #9ca3af;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: white;
}

.copyright {
    color: #9ca3af;
    font-size: 0.9rem;
    margin-top: 1rem;
}

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: #4f46e5;
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: #4338ca;
    transform: translateY(-3px);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .logo {
        font-size: 2rem;
    }
    
    .tagline {
        font-size: 1rem;
    }
    
    .nav-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
        text-align: center;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
}

/* 下载页面特定样式 */
.download-section {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    margin-bottom: 2rem;
}

.download-platforms {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.platform-card {
    background: #f8f9fa;
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
    transition: all 0.3s ease;
}

.platform-card:hover {
    background: #e9ecef;
    transform: translateY(-3px);
}

.platform-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: #4f46e5;
}

.download-btn {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    background: #4f46e5;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 600;
    transition: all 0.3s ease;
    margin-top: 1rem;
}

.download-btn:hover {
    background: #4338ca;
    transform: translateY(-2px);
}

/* 404页面样式 */
.error-container {
    min-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
}

.error-code {
    font-size: 6rem;
    font-weight: 700;
    color: #4f46e5;
    margin-bottom: 1rem;
}

.error-message {
    font-size: 1.5rem;
    color: #666;
    margin-bottom: 2rem;
}

/* 教程部分 */
.tutorials {
    background: #f8f9fa;
    padding: 3rem 0;
    border-radius: 10px;
    margin: 3rem 0;
}

.tutorial-steps {
    max-width: 800px;
    margin: 2rem auto;
}

.step {
    display: flex;
    align-items: flex-start;
    margin-bottom: 2rem;
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
}

.step-number {
    background: #4f46e5;
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    margin-right: 1rem;
    flex-shrink: 0;
}

.step-content h3 {
    color: #333;
    margin-bottom: 0.5rem;
}

.step-content p {
    color: #666;
    font-size: 0.95rem;
}