/* 防闪白CSS - 必须在页面最前面加载 */
html { 
    background-color: #1a1a1a !important; 
}

body { 
    background-color: #1a1a1a !important; 
    color: #ffffff !important;
    margin: 0 !important;
    padding: 0 !important;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif !important;
    opacity: 1 !important; 
}

/* 关键布局元素立即显示 */
.navbar, .hero, .footer {
    opacity: 1 !important;
    visibility: visible !important;
}

/* 防止内容跳动 */
* {
    box-sizing: border-box !important;
}

/* 快速显示主要容器 */
.hero {
    min-height: 100vh !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
}