/* ---------- base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

/* Honor the `hidden` attribute over our class-level `display` rules.
   Without !important, our own `.chat-error { display: flex }` etc. would
   beat the UA `[hidden] { display: none }` on equal specificity. */
[hidden] {
  display: none !important;
}
body {
  background: var(--bg);
  color: var(--text);
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu,
    Cantarell, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100vh; /* fallback for browsers without dvh */
  min-height: 100dvh; /* dynamic vh: shrinks when the mobile keyboard opens
                         so the composer doesn't end up hidden under it */
  position: relative;
  isolation: isolate;
  /* Smooth color transitions when the user toggles theme - tokens cross-
     fade instead of snapping. Limited list (no `all`) so we don't slow
     down hover transitions on individual elements. */
  transition:
    background-color 0.4s ease,
    color 0.4s ease;
}
/* Soft brand-tinted aurora layered behind the page. A fixed pseudo-element
   keeps it pinned to the viewport (no scroll jitter) and a slow alternating
   transform animation gives the page a subtle "alive" feel without
   competing with content. */
body::before {
  content: "";
  position: fixed;
  inset: -10%;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(
      1200px 600px at 10% -10%,
      var(--brand-soft),
      transparent 60%
    ),
    radial-gradient(
      900px 500px at 100% 110%,
      var(--brand-soft),
      transparent 60%
    );
  animation: aurora-drift 28s ease-in-out infinite alternate;
  will-change: transform;
}
@keyframes aurora-drift {
  from {
    transform: translate3d(0, 0, 0) scale(1);
  }
  to {
    transform: translate3d(2%, -1.5%, 0) scale(1.06);
  }
}
img,
svg {
  max-width: 100%;
  height: auto;
}
button {
  font: inherit;
}

a {
  color: var(--link);
  text-decoration: none;
}
a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

:focus-visible {
  outline: 3px solid var(--brand);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--brand);
  color: var(--on-brand);
  padding: 0.5rem 1rem;
  z-index: 100;
}
.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

.muted {
  color: var(--text-muted);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}