:root {
  --bg: #faf8f5;
  --fg: #17171c;
  --muted: #5e5e6b;
  --faint: #9d9daa;
  --accent: #c2410c;
  --accent-fg: #fffaf6;
  --track: #e7e2da;
  --ghost: #ece7df;
  --ghost-fg: #3d3d47;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111116;
    --fg: #f3f1ed;
    --muted: #a3a3b0;
    --faint: #63636f;
    --accent: #f97316;
    --accent-fg: #1a0f07;
    --track: #26262f;
    --ghost: #22222b;
    --ghost-fg: #d6d4d0;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior-y: contain;
}

.app {
  height: 100dvh;
  max-width: 34rem;
  margin: 0 auto;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 0.5rem;
  padding: max(0.75rem, env(safe-area-inset-top)) 1rem max(1rem, env(safe-area-inset-bottom));
}

.topbar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.pips {
  display: flex;
  flex: 1;
  gap: 3px;
  height: 3px;
}

.panel-toggle {
  appearance: none;
  border: 0;
  background: none;
  color: var(--faint);
  font: inherit;
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  line-height: 1;
  padding: 0.4rem 0.2rem 0.4rem 0.5rem;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.panel-toggle:hover {
  color: var(--muted);
}

.pip {
  flex: 1;
  border-radius: 2px;
  background: var(--track);
  transition: background 180ms ease;
}

.pip.done {
  background: var(--accent);
}

.card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 1rem;
  text-align: center;
  cursor: pointer;
  user-select: none;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.prompt {
  font-size: clamp(2.75rem, 13vw, 4.5rem);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.02em;
  transition: font-size 160ms ease, color 160ms ease;
}

.prompt.small {
  font-size: clamp(1.1rem, 4.5vw, 1.5rem);
  font-weight: 500;
  color: var(--muted);
}

.answer {
  font-size: clamp(2rem, 9vw, 3.25rem);
  font-weight: 500;
  line-height: 1.1;
}

.rank {
  font-size: 0.8125rem;
  color: var(--faint);
  font-variant-numeric: tabular-nums;
}

.controls {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  min-height: 4rem;
}

.grade {
  flex: 1;
  appearance: none;
  border: 0;
  border-radius: 14px;
  padding: 1.05rem 1rem;
  font-family: inherit;
  font-size: 1.0625rem;
  font-weight: 600;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: transform 80ms ease;
}

.grade:active {
  transform: scale(0.975);
}

/* "Again" is deliberately neutral, never red: missing a word is a routing
   decision, not a failure. */
.again {
  background: var(--ghost);
  color: var(--ghost-fg);
}

.got-it {
  background: var(--accent);
  color: var(--accent-fg);
}

.hint {
  margin: 0 auto;
  color: var(--faint);
  font-size: 0.875rem;
}

.done-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  text-align: center;
}

.done-title {
  margin: 0;
  font-size: clamp(1.75rem, 7vw, 2.5rem);
  font-weight: 600;
}

.done-stats {
  margin: 0;
  color: var(--muted);
}

.deck-progress {
  width: 100%;
  margin: 1.5rem 0;
}

.bar {
  height: 8px;
  border-radius: 4px;
  background: var(--track);
  overflow: hidden;
}

.fill {
  height: 100%;
  border-radius: 4px;
  background: var(--accent);
  transition: width 400ms ease;
}

.deck-count {
  margin: 0.6rem 0 0;
  color: var(--faint);
  font-size: 0.875rem;
}

.backdrop {
  position: fixed;
  inset: 0;
  z-index: 1;
  background: rgba(0, 0, 0, 0.35);
}

.panel {
  position: fixed;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: 2;
  max-width: 34rem;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1rem 1rem calc(1rem + env(safe-area-inset-bottom));
  border-radius: 18px 18px 0 0;
  background: var(--bg);
  box-shadow: 0 -8px 40px rgba(0, 0, 0, 0.22);
}

.panel-item {
  appearance: none;
  border: 0;
  border-radius: 12px;
  background: var(--ghost);
  color: var(--ghost-fg);
  font: inherit;
  font-size: 1rem;
  text-align: left;
  padding: 0.95rem 1rem;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

.panel-note {
  margin: 0.25rem 0 0;
  color: var(--faint);
  font-size: 0.8125rem;
  text-align: center;
}

.notice {
  position: fixed;
  left: 50%;
  top: calc(3.25rem + env(safe-area-inset-top));
  transform: translateX(-50%);
  z-index: 3;
  pointer-events: none;
  max-width: 90vw;
  padding: 0.7rem 1.1rem;
  border-radius: 999px;
  background: var(--fg);
  color: var(--bg);
  font-size: 0.875rem;
  text-align: center;
}