:root {
  --sakura: #ea7c8a;
  --sakura-dark: #c95567;
  --bg: #fff8fa;
  --card: #ffffff;
  --text: #2b2b2b;
  --muted: #888;
  --ok: #2e7d32;
  --ng: #c62828;
  --border: #f0d6dc;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", "Hiragino Sans", "Yu Gothic UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

header {
  background: linear-gradient(135deg, var(--sakura), var(--sakura-dark));
  color: #fff;
  padding: 1.5rem 1rem 1rem;
  text-align: center;
}

header h1 { margin: 0; font-size: 1.6rem; letter-spacing: 0.05em; }
header .sub { font-size: 0.9rem; font-weight: normal; opacity: 0.9; }

.progress {
  margin-top: 0.6rem;
  font-size: 0.9rem;
  opacity: 0.95;
}

main {
  max-width: 40rem;
  margin: 1.2rem auto;
  padding: 0 1rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.4rem;
  box-shadow: 0 2px 6px rgba(0,0,0,0.04);
}

.q {
  font-size: 1.1rem;
  margin: 0 0 1rem;
  font-weight: 600;
}

.choices {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.choice {
  text-align: left;
  padding: 0.8rem 1rem;
  font-size: 1rem;
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.choice:hover:not(:disabled) {
  border-color: var(--sakura);
  background: #fff5f7;
}

.choice:disabled { cursor: not-allowed; opacity: 0.85; }

.choice.correct { border-color: var(--ok); background: #e8f5e9; }
.choice.wrong   { border-color: var(--ng); background: #ffebee; }

.feedback {
  margin-top: 1rem;
  padding: 0.8rem 1rem;
  border-radius: 8px;
  font-size: 0.95rem;
}

.feedback.ok { background: #e8f5e9; color: var(--ok); }
.feedback.ng { background: #ffebee; color: var(--ng); }

.actions {
  margin-top: 1rem;
  display: flex;
  justify-content: flex-end;
}

button.primary {
  background: var(--sakura);
  color: #fff;
  border: none;
  padding: 0.7rem 1.4rem;
  font-size: 1rem;
  border-radius: 8px;
  cursor: pointer;
}

button.primary:hover { background: var(--sakura-dark); }

.score {
  text-align: center;
  padding: 1rem 0;
}

.score .big {
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--sakura-dark);
}

footer {
  text-align: center;
  padding: 1rem;
  color: var(--muted);
}