/* Shared styles for the SEO satellite pages (/offline-document-editor,
   /no-signup-document-editor, /open/*, /convert/*, and their /zh-CN/
   mirrors). Utilitarian document layout, but on the same design system as the
   homepage: every value comes from the ranui token layer (/ran-tokens.css,
   loaded before this file), the chrome is real ranui components registered by
   the /ranui-iife/<name>.iife.js bundles (<r-button>, <r-card>), and the
   visual language mirrors
   home.css — hairline rules, mono type for machine facts, blue spent only on
   the primary action. Dark mode comes from the token layer for free. */

* {
  box-sizing: border-box;
}
:root {
  --ink: var(--ran-color-text);
  --ink-2: var(--ran-color-text-secondary);
  --muted: var(--ran-gray-800);
  --rule: var(--ran-color-border);
  --accent: var(--ran-color-primary);
  --signal: var(--ran-color-success);
  --sans: var(--ran-font-family);
  --mono: var(--ran-font-mono);
}
body {
  margin: 0;
  background: var(--ran-color-bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a {
  color: var(--accent);
}
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---------- top bar (mirrors the homepage bar) ---------- */
header.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--ran-space-4);
  padding: var(--ran-space-4) clamp(20px, 5vw, 56px);
  border-bottom: 1px solid var(--rule);
}
header.bar .brand {
  display: inline-flex;
  align-items: center;
  gap: var(--ran-space-2);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
}
header.bar .logo {
  width: 24px;
  height: 24px;
  border-radius: var(--ran-radius-sm);
  /* monochrome mark (Geist): ink on page bg, inverts with the theme */
  background: var(--ink);
  display: inline-grid;
  place-items: center;
  color: var(--ran-color-bg);
  font-size: 13px;
  font-weight: 700;
}
header.bar nav {
  display: flex;
  align-items: center;
  gap: var(--ran-space-1);
}
header.bar nav a {
  display: inline-flex;
  align-items: center;
  gap: var(--ran-space-2);
  padding: var(--ran-space-2) var(--ran-space-3);
  border-radius: var(--ran-radius-sm);
  font-size: 14px;
  color: var(--ink-2);
  text-decoration: none;
  transition: 0.15s ease;
}
header.bar nav a:hover {
  color: var(--ink);
  background: var(--ran-color-bg-hover);
}
.ghmark {
  width: 15px;
  height: 15px;
  fill: currentColor;
  flex: none;
}
/* language switch: same ranui <r-select> as the homepages, wired by the shared
   /lang-switch.js (targets declared as data-href on the options) */
.lang-wrap {
  display: inline-flex;
  align-items: center;
  gap: var(--ran-space-1);
  padding-left: var(--ran-space-1);
}
.langmark {
  width: 15px;
  height: 15px;
  color: var(--muted);
  flex: none;
}
r-select.lang-select {
  display: inline-block;
  min-width: 84px;
  font-size: 14px;
}
/* hide the raw option list pre-upgrade; the reserved width avoids layout shift */
r-select.lang-select:not(:defined) {
  visibility: hidden;
}

/* ---------- article column ---------- */
.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: var(--ran-space-6) clamp(20px, 5vw, 56px) var(--ran-space-10);
}
.eyebrow {
  margin: var(--ran-space-8) 0 0;
  font: 600 12px/1 var(--mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  /* gray mono label — blue is reserved for links */
  color: var(--muted);
}
h1 {
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin: var(--ran-space-3) 0 var(--ran-space-3);
  text-wrap: balance;
}
h2 {
  font-size: 21px;
  letter-spacing: -0.02em;
  margin: var(--ran-space-10) 0 var(--ran-space-4);
  padding-bottom: var(--ran-space-3);
  border-bottom: 1px solid var(--rule);
}
p {
  margin: var(--ran-space-3) 0;
}
.lead {
  font-size: 18px;
  color: var(--ink-2);
  margin: 0 0 var(--ran-space-4);
}

/* CTA: a real <r-button> wrapped in a link (static pages navigate, not script) */
.cta {
  display: inline-block;
  margin: var(--ran-space-4) 0 var(--ran-space-5, 20px);
  text-decoration: none;
}
/* r-button exports parts "button" (container) and "content" (padding/border/
   typography). The :not(:defined) fallback below must stay pixel-identical to
   these values or the custom-element upgrade flashes on load. */
.cta r-button::part(button) {
  border-radius: var(--ran-radius-full);
}
.cta r-button::part(content) {
  border-radius: var(--ran-radius-full);
  padding: var(--ran-space-3) var(--ran-space-6);
  font-size: 15.5px;
  font-weight: 600;
}
/* pre-upgrade fallback so the CTA is a styled, clickable button even before
   (or without) the /ranui-iife/*.iife.js bundles — same progressive-enhancement
   idea as the static-page fallbacks on the homepage. Mirrors type="contrast". */
.cta r-button:not(:defined) {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--ran-space-3) var(--ran-space-6);
  border-radius: var(--ran-radius-full);
  border: 1px solid var(--ran-color-contrast-bg, var(--ran-gray-1000));
  background: var(--ran-color-contrast-bg, var(--ran-gray-1000));
  color: var(--ran-color-contrast-text, var(--ran-background-100));
  font-weight: 600;
  font-size: 15.5px;
  line-height: 22px; /* matches .ran-btn-content's default line-height */
}

ul {
  padding-left: 20px;
  margin: var(--ran-space-4) 0;
}
li {
  margin: var(--ran-space-2) 0;
}
li::marker {
  color: var(--ran-color-border-hover);
}

/* open-source note: a real <r-card>, with a pre-upgrade border fallback */
r-card.oss {
  display: block;
  margin: var(--ran-space-8) 0;
}
/* pre-upgrade fallback: mirrors the upgraded .ran-card chrome exactly
   (border, radius-md, page background, its built-in 16px padding) */
r-card.oss:not(:defined) {
  border: 1px solid var(--rule);
  border-radius: var(--ran-radius-md);
  background: var(--ran-color-bg);
  padding: var(--ran-space-4);
}
r-card.oss .card-body {
  padding: var(--ran-space-4) var(--ran-space-6);
  font-size: 15px;
}
r-card.oss a {
  font-weight: 600;
}

/* ---------- faq: hairline per question (mirrors homepage FAQ) ---------- */
.faq h3 {
  font-size: 16.5px;
  letter-spacing: -0.01em;
  margin: 0;
  padding: var(--ran-space-4) 0 0;
  border-top: 1px solid var(--rule);
}
.faq h3:first-child {
  border-top: none;
  padding-top: 0;
}
.faq p {
  margin: var(--ran-space-1) 0 var(--ran-space-4);
  color: var(--ink-2);
  font-size: 15px;
}
h2.faq {
  border-bottom: 1px solid var(--rule);
}

/* ---------- footer ---------- */
footer {
  margin-top: var(--ran-space-16);
  padding-top: var(--ran-space-4);
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 13.5px;
}
footer a {
  color: var(--ink-2);
  text-decoration: none;
  margin-right: var(--ran-space-4);
}
footer a:hover {
  color: var(--ink);
}

/* ---------- theme switch (footer) ----------
   Real ranui <r-theme-switch>. The pre-upgrade fallback reserves the pill's
   exact footprint (3×28px buttons + gaps + padding + border) — no shift. */
r-theme-switch.theme-switch {
  vertical-align: middle;
}
r-theme-switch.theme-switch:not(:defined) {
  display: inline-block;
  width: 94px;
  height: 34px;
  border: 1px solid var(--rule);
  border-radius: var(--ran-radius-full);
}
/* footer rows on the satellites are plain text; give the pill its own line spacing */
footer .theme-switch {
  margin-top: var(--ran-space-4);
}