:root{--color-primary: #5c6bc0;--color-primary-dark: #3f51b5;--color-bg-primary: #ffffff;--color-bg-secondary: #f5f5f5;--color-text-primary: #111111;--color-text-secondary: #3a3a3a;--color-border: #e0e0e0;--sidebar-hover-bg: #eaeaea;--font-serif: Georgia, "Times New Roman", serif;--font-sans: system-ui, -apple-system, sans-serif;--font-mono: "Fira Code", monospace;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--reader-font-size: 1rem;--reader-line-height: 1.6;--reader-font-family: var(--font-serif)}[data-theme=dark]{--color-bg-primary: #1a1a1a;--color-bg-secondary: #242424;--color-text-primary: #f5f5f5;--color-text-secondary: #c8c8c8;--color-border: #3a3a3a;--sidebar-hover-bg: #333333}[data-theme=sepia]{--color-bg-primary: #fdf8f0;--color-bg-secondary: #f5efe5;--color-text-primary: #1a1408;--color-text-secondary: #4a3d20;--color-border: #e0d4c0;--sidebar-hover-bg: #ebe0d0}[data-font-size=small]{--reader-font-size: 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var(--color-border);background-color:var(--color-bg-secondary)}.note-editor__format-buttons{display:flex;gap:.25rem}.note-editor__btn{padding:.375rem .625rem;border:1px solid var(--color-border);border-radius:4px;background-color:var(--color-bg-primary);color:var(--color-text-primary);cursor:pointer;font-size:.875rem;transition:all 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