:root{--nb-fg:#333;--nb-fg-muted:#666;--nb-fg-subtle:#999;--nb-surface:#fff;--nb-surface-raised:#f5f5f5;--nb-surface-sunken:#fafafa;--nb-border:#e5e7eb;--nb-border-soft:#eee;--nb-border-strong:#ccc;--nb-hover:#f5f5f5;--nb-header-bg:#fffffff2;--nb-footer-bg:#222;--nb-footer-fg:#fff;--nb-page-gradient:linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 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