/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; color-scheme: light; }
body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  font-family: var(--font);
  font-size: var(--fs-md);
  line-height: 1.45;
  color: rgb(var(--c-ink));
  background: rgb(var(--c-bg));
  -webkit-font-smoothing: antialiased;
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}
::selection { background: rgb(var(--c-accent) / 0.28); color: rgb(var(--c-primary-deep)); }
[hidden] { display: none !important; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: rgb(var(--c-primary)); }
a, button { -webkit-tap-highlight-color: rgb(var(--c-accent) / 0.15); }
button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible,
textarea:focus-visible, summary:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid rgb(var(--c-accent));
  outline-offset: 2px;
}
@media (max-width: 640px) {
  input, select, textarea { font-size: 16px !important; }  /* no iOS zoom-on-focus */
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* ---------- utilities (legacy + §2.3) ---------- */
.stack { display: flex; flex-direction: column; gap: var(--sp-3); }
.stack-sm { display: flex; flex-direction: column; gap: var(--sp-2); }
.row { display: flex; align-items: center; gap: var(--sp-2); flex-wrap: wrap; }
.row-nowrap { display: flex; align-items: center; gap: var(--sp-2); flex-wrap: nowrap; }
.grow { flex: 1 1 0; min-width: 0; }
.muted, .text-mute { color: rgb(var(--c-mute)); }
.text-danger { color: rgb(var(--c-danger-text)); }
.small { font-size: var(--fs-xs); }
.mono { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-variant-numeric: tabular-nums; }
.mt-0 { margin-top: 0; }
.mt-12 { margin-top: var(--sp-3); }
.mb-0 { margin-bottom: 0; }
.mb-12 { margin-bottom: var(--sp-3); }
.ta-center { text-align: center; }
.w-full { width: 100%; }
.fw-600 { font-weight: 600; }
.nowrap { white-space: nowrap; }
.pre-wrap { white-space: pre-wrap; }