* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg-app); color: var(--text-primary);
  font-family: var(--font-body); font-size: var(--text-md); line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  /* Canvas depth (B1): a soft pool behind the page head + two corner washes — never a flat fill.
     Center pool is direction-neutral (50%), so LTR and RTL read identically. */
  background-image:
    radial-gradient(1100px 520px at 50% -12%, var(--app-glow-hero), transparent 60%),
    radial-gradient(1200px 600px at 85% -10%, var(--app-glow-1), transparent 60%),
    radial-gradient(900px 500px at -5% 110%, var(--app-glow-2), transparent 55%);
  background-attachment: fixed;
}
h1,h2,h3,h4 { font-family: var(--font-display); font-weight: 600; letter-spacing: -.01em; color: var(--text-primary); margin: 0 0 var(--sp-3); }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.muted { color: var(--text-secondary); }
.dim { color: var(--text-tertiary); }
.pre-wrap { white-space: pre-wrap; word-break: break-word; margin: 0; }
.media-preview { max-width: 100%; max-height: 420px; border-radius: var(--r-2); border: 1px solid var(--border-strong); }
.placeholder-bar { display: flex; flex-wrap: wrap; align-items: center; gap: var(--sp-2); margin-top: var(--sp-2); }

/* Scrollbars — themed in both engines. Firefox: thin + scrollbar-color. Chrome/Edge: a transparent track
   (so the default LIGHT track never shows once ::-webkit is styled) and a thumb drawn with a transparent
   border + padding-box clip, so it reads as an inset pill on ANY surface — no bg-coloured halo. */
* { scrollbar-width: thin; scrollbar-color: var(--border-strong) transparent; }
::-webkit-scrollbar { width: 12px; height: 12px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-corner { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: var(--r-pill); border: 3px solid transparent; background-clip: padding-box; }
::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); background-clip: padding-box; }

:focus-visible { outline: none; box-shadow: var(--ring); border-radius: var(--r-1); }

/* Keep document navigation native. Automatic cross-document View Transitions can reject their browser-owned
   promise when a navigation is superseded or otherwise ineligible, surfacing a noisy AbortError in Chromium. */