/**
 * TICKET-315: Site-Update Announcement Prompt
 *
 * Non-blocking toast anchored to bottom-right corner.
 * Loaded globally — component is hidden by default (hidden attr on markup).
 * Uses design tokens — no hardcoded hex values.
 *
 * Rules:
 *  - Must not obscure any interactive solver content
 *  - Dismiss is always reachable via keyboard
 *  - Light mode: paper-stack variant (no glow)
 *  - Transition time respects --dur-mid / reduced-motion tokens
 */

/* ─── Base toast ─────────────────────────────────────────────────────────────── */

.cws-announcement {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 500;
  max-width: 22rem;
  width: calc(100vw - 3rem);
  background-color: var(--bg-panel);
  border: 1px solid var(--border-subtle);
  border-left: 3px solid var(--accent);
  border-radius: 4px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.45);
  font-family: var(--font-logic);
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;

  /* Hidden until JS adds --visible */
  opacity: 0;
  transform: translateY(0.75rem);
  pointer-events: none;
  transition:
    opacity    var(--dur-mid) var(--ease-shutter),
    transform  var(--dur-mid) var(--ease-shutter);
}

/* When [hidden] is removed and --visible class is present */
.cws-announcement.cws-announcement--visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* Hiding state — transition back out */
.cws-announcement.cws-announcement--hiding {
  opacity: 0;
  transform: translateY(0.5rem);
  pointer-events: none;
}

/* Light mode */
html.light-mode .cws-announcement {
  background-color: var(--surface-paper);
  border-color: var(--line-soft);
  border-left-color: var(--amber-logic);
  box-shadow: var(--surface-stack-shadow);
  color: var(--ink-slate);
}

/* ─── Body padding ───────────────────────────────────────────────────────────── */

.cws-announcement__body {
  padding: 1rem 1.125rem 1rem 1rem;
}

/* ─── Message text ───────────────────────────────────────────────────────────── */

.cws-announcement__message {
  margin: 0 0 0.875rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.6;
}

html.light-mode .cws-announcement__message {
  color: var(--ink-slate);
}

/* ─── Actions row ────────────────────────────────────────────────────────────── */

.cws-announcement__actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  justify-content: space-between;
}

/* ─── CTA link ───────────────────────────────────────────────────────────────── */

.cws-announcement__cta {
  display: inline-block;
  background-color: var(--accent);
  color: var(--ink-nocturnal);
  padding: 0.4rem 0.875rem;
  border-radius: 3px;
  text-decoration: none;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-family: var(--font-logic);
  transition: background-color var(--dur-fast);
  flex-shrink: 0;
}

.cws-announcement__cta:hover {
  background-color: var(--primary-dark);
  text-decoration: none;
  color: var(--ink-nocturnal);
}

html.light-mode .cws-announcement__cta {
  background-color: var(--amber-logic);
  color: #fff;
}

html.light-mode .cws-announcement__cta:hover {
  background-color: var(--primary-dark);
  color: #fff;
}

/* ─── Dismiss button ─────────────────────────────────────────────────────────── */

.cws-announcement__dismiss {
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  cursor: pointer;
  padding: 0;
  line-height: 1;
  flex-shrink: 0;
  transition:
    background-color var(--dur-fast),
    border-color     var(--dur-fast),
    color            var(--dur-fast);
}

.cws-announcement__dismiss:hover {
  background-color: var(--border-subtle);
  color: var(--text-primary);
}

.cws-announcement__dismiss:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

html.light-mode .cws-announcement__dismiss {
  border-color: var(--line-soft);
  color: var(--ink-slate);
}

html.light-mode .cws-announcement__dismiss:hover {
  background-color: var(--amber-soft);
  border-color: var(--amber-logic);
  color: var(--ink-blueprint);
}

html.light-mode .cws-announcement__dismiss:focus-visible {
  outline-color: var(--amber-logic);
}

/* ─── Mobile ─────────────────────────────────────────────────────────────────── */

@media (max-width: 480px) {
  .cws-announcement {
    bottom: 0;
    right: 0;
    max-width: 100%;
    width: 100%;
    border-radius: 4px 4px 0 0;
    border-left: none;
    border-top: 3px solid var(--accent);
  }

  html.light-mode .cws-announcement {
    border-top-color: var(--amber-logic);
  }
}