/* BORDERS & ELEVATION — hairlines carry structure. There are no shadows in this system:
   no drop shadow, no inner shadow, no gradient, no 3D. Depth comes from surface tone. */
:root{
  --border-hairline:1px solid var(--line-hairline);
  --border-medium:1px solid var(--line-medium);
  --border-strong:1px solid var(--line-strong);
  --border-rule-heavy:2px solid var(--ink-900);
  --border-inverse:1px solid var(--line-inverse);

  --radius-none:0px;
  --radius-hint:2px; /* inputs and small controls only */
  --radius-max:0px;  /* there are no pills */

  --shadow-none:none;
  --elevation-1:none;
  --elevation-2:none;
}