:root{--sidebar-width:300px;--header-height:80px;--color-text-main:#000;--color-text-secondary:#666;--color-text-tertiary:#999;--color-text-link:#1a1a1a;--color-bg-white:#fff;--color-bg-light:#fafafa;--color-bg-lighter:#f8f9fa;--color-bg-tag:#f5f5f5;--color-border:#e0e0e0;--color-border-light:#f0f0f0;--color-primary:#000;--color-primary-hover:#333;--color-level-bg:#e6f7ff;--color-level-text:#1890ff;--sidebar-card-padding:.75rem 1rem;--sidebar-card-gap:.75rem}body{background:#fff;color:#1a1a1a;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Helvetica Neue,Arial,sans-serif;line-height:1.6}*,body{margin:0;padding:0}*{box-sizing:border-box}