/* css/style.css */
:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1a1a;
  --accent: #1d4645;
  --accent-fg: #ffffff;
  --card-bg: #f4f4f2;
  --border: #cfcfcf;
  --correct: #1a7a3c;
  --incorrect: #b3261e;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14181a;
    --fg: #f0f0f0;
    --accent: #4fb3a9;
    --accent-fg: #0b1211;
    --card-bg: #1f2528;
    --border: #3a4144;
    --correct: #6fcf8f;
    --incorrect: #f2938c;
  }
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, sans-serif;
  max-width: 40rem;
  margin: 0 auto;
  padding: 1.5rem;
}

button {
  font-size: 1rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--card-bg);
  color: var(--fg);
  cursor: pointer;
}

button:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.card-front {
  width: 100%;
  min-height: 4rem;
  font-size: 1.5rem;
  text-align: center;
  margin: 0 0 1rem;
}

#answer-form {
  display: flex;
  gap: 0.5rem;
  align-items: flex-end;
}

#answer-form[hidden] {
  display: none;
}

#answer-form label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

#answer-input {
  flex: 1 1 auto;
  font-size: 1rem;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--bg);
  color: var(--fg);
}

#answer-input:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

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

#answer-feedback.feedback-incorrect {
  color: var(--incorrect);
}

#card-explanation {
  font-style: italic;
  opacity: 0.85;
}

#rating-buttons {
  display: flex;
  gap: 0.5rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

#rating-buttons[hidden] {
  display: none;
}

#rating-buttons button {
  flex: 1 1 20%;
}

#rating-buttons button[data-rating="good"],
#rating-buttons button[data-rating="easy"] {
  background: var(--accent);
  color: var(--accent-fg);
}