/* ─── Reset + foundations ───────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* Quiet clinical palette — pearl on cold gray, like Auscult */
  --bg: oklch(0.97 0.005 230);
  --bg-card: oklch(1 0 0);
  --border: oklch(0.92 0.008 230);
  --text: oklch(0.25 0.015 250);
  --text-soft: oklch(0.50 0.020 250);
  --text-muted: oklch(0.65 0.015 250);
  --accent: oklch(0.55 0.110 245);
  --accent-soft: oklch(0.92 0.040 245);
  --accent-bg: oklch(0.97 0.020 245);
  --regen: oklch(0.62 0.130 165);
  --regen-soft: oklch(0.94 0.040 165);
  --shadow: 0 1px 3px oklch(0 0 0 / 0.04), 0 4px 24px oklch(0 0 0 / 0.04);

  /* Typography */
  --font-ui: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-read: ui-serif, "Iowan Old Style", "Charter", Georgia, serif;
}

html, body {
  height: 100%;
  font-family: var(--font-ui);
  background: var(--bg);
  color: var(--text);
  font-feature-settings: "cv11", "ss01";
  -webkit-font-smoothing: antialiased;
}

/* ─── Stage layout ─────────────────────────────────────────────────── */
.stage {
  max-width: 820px;
  margin: 0 auto;
  padding: 48px 32px 32px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* ─── Metadata header ──────────────────────────────────────────────── */
.meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.meta-tags { display: flex; gap: 10px; flex-wrap: wrap; }
.meta-right { display: flex; gap: 14px; align-items: center; color: var(--text-muted); font-size: 14px; font-variant-numeric: tabular-nums; }

.tag {
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.01em;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-soft);
}
.tag.specialty {
  background: var(--accent-bg);
  border-color: var(--accent-soft);
  color: var(--accent);
}

.duration::before { content: "⏱ "; opacity: 0.6; }

/* ─── Scenario card ────────────────────────────────────────────────── */
.scenario {
  flex: 1;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 48px 56px;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 480px;
}

.scenario-text {
  font-family: var(--font-read);
  font-size: 22px;
  line-height: 1.65;
  color: var(--text);
  text-align: left;
  max-width: 65ch;
  /* Optical adjustments for read-aloud */
  text-wrap: pretty;
  hyphens: auto;
  font-feature-settings: "kern", "liga";
}

/* Smooth crossfade when switching scenarios */
.scenario-text.fade-out { opacity: 0; transition: opacity 120ms ease-out; }
.scenario-text.fade-in  { opacity: 1; transition: opacity 200ms ease-in; }

/* ─── Controls ─────────────────────────────────────────────────────── */
.controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.kbd-hint {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
  font-size: 13px;
}
.kbd-hint .dot { opacity: 0.4; margin: 0 4px; }

kbd {
  display: inline-block;
  padding: 2px 6px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 4px;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 11px;
  color: var(--text-soft);
  font-weight: 500;
}

.actions { display: flex; gap: 10px; align-items: center; }

button {
  font-family: var(--font-ui);
  font-size: 14px;
  font-weight: 500;
  padding: 10px 18px;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 80ms ease, background 120ms ease, border 120ms ease;
  user-select: none;
}
button:active { transform: translateY(1px); }

.btn-primary {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}
.btn-primary:hover { background: oklch(0.50 0.110 245); }

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-soft);
  border-color: var(--border);
}
.btn-secondary:hover { color: var(--text); border-color: var(--text-muted); }

.btn-regenerate {
  background: var(--regen-soft);
  color: oklch(0.40 0.110 165);
  border-color: oklch(0.85 0.060 165);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-regenerate:hover { background: oklch(0.91 0.050 165); }
.btn-regenerate:disabled { opacity: 0.6; cursor: progress; }

.regen-spinner {
  width: 12px;
  height: 12px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 700ms linear infinite;
}
.hidden { display: none !important; }

@keyframes spin { to { transform: rotate(360deg); } }

/* ─── Toast ────────────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--text);
  color: var(--bg-card);
  padding: 12px 22px;
  border-radius: 10px;
  font-size: 14px;
  box-shadow: 0 8px 32px oklch(0 0 0 / 0.18);
  opacity: 0;
  transition: opacity 200ms ease, transform 200ms ease;
}
.toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}
.toast.error { background: oklch(0.45 0.150 25); }

/* ─── Mobile ───────────────────────────────────────────────────────── */
@media (max-width: 720px) {
  .stage { padding: 24px 16px; }
  .scenario { padding: 28px 24px; min-height: 360px; }
  .scenario-text { font-size: 18px; }
  .controls { flex-direction: column; align-items: stretch; }
  .kbd-hint { display: none; }
  .actions { justify-content: space-between; }
  .actions button { flex: 1; }
}