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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Helvetica, Arial, sans-serif;
    background: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

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

/* 头部 */
.header {
    background: linear-gradient(135deg, #2d8cf0 0%, #1a6bbf 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
}

.header h1 {
    font-size: 48px;
    margin-bottom: 16px;
}

.subtitle {
    font-size: 20px;
    opacity: 0.9;
    margin-bottom: 32px;
}

.btn-group {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: bold;
    transition: all 0.3s;
}

.btn-primary {
    background: white;
    color: #2d8cf0;
}

.btn-primary:hover {
    background: #f0f0f0;
    transform: translateY(-2px);
}

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

.btn-outline:hover {
    background: rgba(255,255,255,0.1);
    transform: translateY(-2px);
}

/* 版本标签 */
.version-badge {
    background: #e8f4fe;
    padding: 12px 20px;
    border-radius: 8px;
    text-align: center;
    margin: 40px 0;
    color: #2d8cf0;
    font-weight: 500;
}

/* 功能区域 */
.features {
    margin: 60px 0;
}

.features h2 {
    text-align: center;
    margin-bottom: 40px;
    font-size: 32px;
}

.feature-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
}

.feature-card {
    flex: 1;
    min-width: 280px;
    background: white;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.08);
    transition: transform 0.2s;
}

.feature-card:hover {
    transform: translateY(-4px);
}

.feature-card h3 {
    color: #2d8cf0;
    margin-bottom: 12px;
}

/* 下载区域 */
.download {
    margin: 60px 0;
}

.download h2 {
    text-align: center;
    margin-bottom: 40px;
    font-size: 32px;
}

.download-box {
    background: white;
    padding: 40px;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 2px 12px rgba(0,0,0,0.08);
}

.version-name {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 12px;
}

.md5 {
    font-size: 12px;
    color: #999;
    margin-top: 16px;
}

/* 文档区域 */
.docs {
    margin: 60px 0;
}

.docs h2 {
    text-align: center;
    margin-bottom: 40px;
    font-size: 32px;
}

.doc-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
}

.doc-card {
    flex: 1;
    min-width: 250px;
    background: white;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.doc-card h3 {
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid #2d8cf0;
}

.doc-card ul {
    list-style: none;
}

.doc-card li {
    margin: 10px 0;
}

.doc-card a {
    color: #2d8cf0;
    text-decoration: none;
}

.doc-card a:hover {
    text-decoration: underline;
}

/* 底部 */
.footer {
    background: #333;
    color: #999;
    text-align: center;
    padding: 40px 0;
    margin-top: 60px;
}

.footer a {
    color: #2d8cf0;
    text-decoration: none;
}

/* 响应式 */
@media (max-width: 768px) {
    .header h1 {
        font-size: 32px;
    }
    .subtitle {
        font-size: 16px;
    }
    .btn-group {
        flex-direction: column;
        align-items: center;
    }
    .btn {
        width: 200px;
    }
}