:root {
  color-scheme: dark;
  --bg: #12141a;
  --panel: #1b1e27;
  --text: #f2f3f5;
  --muted: #9aa0ac;
  --border: #2a2e3a;
  --accent: #5b8cff;
  --good: #3ecf8e;
  --bad: #e5534b;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f5f6f8;
  --panel: #ffffff;
  --text: #14161c;
  --muted: #5b6270;
  --border: #dde1e8;
  --accent: #2f6fed;
  --good: #1f9d63;
  --bad: #c9362d;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
  align-items: center;
}

header {
  width: 100%;
  max-width: 480px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 1rem 0.5rem;
}

h1 {
  font-size: 1.4rem;
  margin: 0;
}

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

select {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.3rem 0.5rem;
}

.streak {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.streak .best {
  color: var(--muted);
  font-weight: 400;
  margin-left: 0.5rem;
  font-size: 0.85em;
}

#settings-btn {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  width: 2rem;
  height: 2rem;
  font-size: 1rem;
  cursor: pointer;
  line-height: 1;
}

#settings-btn:hover {
  border-color: var(--accent);
}

.settings-panel {
  width: 100%;
  max-width: 480px;
  padding: 0 1rem;
  display: flex;
  gap: 1.5rem;
  margin-bottom: 0.5rem;
}

.settings-panel.hidden {
  display: none;
}

.settings-panel fieldset {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem 0.8rem 0.7rem;
  margin: 0;
  flex: 1;
}

.settings-panel legend {
  color: var(--muted);
  font-size: 0.8rem;
  padding: 0 0.3rem;
}

.settings-panel label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  padding: 0.15rem 0;
  cursor: pointer;
}

main {
  width: 100%;
  max-width: 480px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
}

.chart-wrap {
  width: 260px;
  height: 260px;
}

.choices {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
}

.choice-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  padding: 0.6rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  font: inherit;
  cursor: pointer;
}

.choice-card img {
  width: 100%;
  max-width: 140px;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: 4px;
  border: 1px solid var(--border);
}

.choice-card span {
  font-size: 0.85rem;
  text-align: center;
}

.choice-card:hover:not(:disabled) {
  border-color: var(--accent);
}

.choice-card:disabled {
  cursor: default;
}

.choice-card.correct {
  border-color: var(--good);
  background: color-mix(in srgb, var(--good) 20%, var(--panel));
}

.choice-card.wrong {
  border-color: var(--bad);
  background: color-mix(in srgb, var(--bad) 20%, var(--panel));
}

.text-guess {
  width: 100%;
  display: flex;
  gap: 0.6rem;
}

.text-guess input {
  flex: 1;
  padding: 0.8rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  font-size: 1rem;
}

.text-guess input:focus {
  outline: none;
  border-color: var(--accent);
}

.text-guess input.correct {
  border-color: var(--good);
}

.text-guess input.wrong {
  border-color: var(--bad);
}

.text-guess button {
  padding: 0.8rem 1.2rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  font-size: 1rem;
  cursor: pointer;
}

.text-guess button:hover:not(:disabled) {
  border-color: var(--accent);
}

.feedback {
  min-height: 1.2em;
  font-weight: 600;
}

.feedback.correct {
  color: var(--good);
}

.feedback.wrong {
  color: var(--bad);
}

.reveal {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
}

.reveal.hidden {
  display: none;
}

.reveal-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  padding: 0.6rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel);
}

.reveal-card img {
  width: 100%;
  max-width: 140px;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: 4px;
  border: 1px solid var(--border);
}

.reveal-card span {
  font-size: 0.85rem;
  text-align: center;
}

.reveal-card.correct {
  border-color: var(--good);
  background: color-mix(in srgb, var(--good) 20%, var(--panel));
}

.reveal-card.wrong {
  border-color: var(--bad);
  background: color-mix(in srgb, var(--bad) 20%, var(--panel));
}

.next-btn {
  padding: 0.8rem 1.4rem;
  border-radius: 8px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}

.next-btn:hover {
  opacity: 0.9;
}

.next-btn.hidden {
  display: none;
}