styles.css

/* styles.css — the only CSS that touches the host page.
 *
 * The extension's own UI (toolbar, menus, preview card) lives inside a Shadow
 * DOM and is styled in content.js, so nothing here can leak into it and nothing
 * on the page can leak in. What remains is the RTL text fix.
 */

/* Persian / Arabic blocks detected by the observer. dir="auto" is set on the
   element itself; these rules only supply typography and alignment. */
.pe-rtl {
    text-align: start;
    font-family: 'Vazirmatn', system-ui, -apple-system, 'Segoe UI', sans-serif;
    line-height: 1.85;
}

/* Fields you type into: keeps the caret, placeholder and text on the right. */
.pe-rtl-input {
    font-family: 'Vazirmatn', system-ui, -apple-system, 'Segoe UI', sans-serif;
    text-align: right;
    line-height: 1.8;
}

/* Never let the fix flip UI chrome that happens to contain Persian labels. */
nav .pe-rtl,
header .pe-rtl,
[role='tablist'] .pe-rtl,
[role='toolbar'] .pe-rtl {
    line-height: inherit;
}

/* The shadow hosts are positioned by script; make sure no page stylesheet
   collapses or repositions them. */
[data-prompt-enhancer] {
    all: initial;
    position: fixed !important;
    inset: 0 auto auto 0 !important;
    width: 0 !important;
    height: 0 !important;
    margin: 0 !important;
    padding: 0 !important;
    border: 0 !important;
    z-index: 2147483646 !important;
    pointer-events: none !important;
}
/* No `contain` here on purpose: `contain: layout` would make this 0x0 host a
   containing block for the fixed-position toolbar inside its shadow root. */