:root {
  --bg: #f6f7f9;
  --fg: #14181f;
  --muted: #6b7280;
  --card: #ffffff;
  --line: #e3e6ea;
  --accent: #2563eb;
  --ok: #16794a;
  --ng: #b42318;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --fg: #e8eaed;
    --muted: #9aa1ac;
    --card: #171a21;
    --line: #272b33;
    --accent: #6ea0ff;
    --ok: #4ade80;
    --ng: #f87171;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 24px 16px 48px;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif;
  line-height: 1.6;
}

.app { max-width: 560px; margin: 0 auto; }

.head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}
.head h1 { font-size: 1.05rem; font-weight: 600; margin: 0; }

.dir {
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--muted);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: .8rem;
  cursor: pointer;
}
.dir:hover { color: var(--fg); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 28px 20px 20px;
  text-align: center;
}

.prompt-label { margin: 0; color: var(--muted); font-size: .82rem; }

.question {
  margin: 10px 0 24px;
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: .01em;
  word-break: break-word;
}

.answer-row { display: flex; gap: 8px; }

#answerInput {
  flex: 1;
  min-width: 0;
  padding: 12px 14px;
  font-size: 1rem;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
}
#answerInput:focus { outline: 2px solid var(--accent); outline-offset: -1px; }

.mic {
  width: 48px;
  flex: none;
  font-size: 1.1rem;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
}
.mic.listening {
  background: var(--accent);
  border-color: var(--accent);
  animation: pulse 1.2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .55; }
}

.btn-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }

button { font-family: inherit; color: var(--fg); }

.primary {
  flex: 1 1 110px;
  padding: 11px;
  font-size: .95rem;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: 10px;
  cursor: pointer;
}

.ghost {
  padding: 11px 14px;
  font-size: .88rem;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
}
.ghost:hover { border-color: var(--accent); }

button:disabled { opacity: .45; cursor: default; }

.choices {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 8px;
  margin-top: 12px;
}

.choice {
  padding: 12px 10px;
  font-size: .95rem;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
}
.choice:hover:not(:disabled) { border-color: var(--accent); }
.choice.is-answer {
  opacity: 1;
  color: var(--ok);
  border-color: var(--ok);
  font-weight: 600;
}

.result {
  min-height: 3.2em;
  margin: 16px 0 0;
  font-size: .95rem;
  white-space: pre-line;
}
.result.ok { color: var(--ok); }
.result.ng { color: var(--ng); }

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  margin-top: 16px;
  color: var(--muted);
  font-size: .82rem;
}
.note { flex-basis: 100%; text-align: center; }

/* ?debug=1 のときだけ出る認識ログ */
.log {
  flex-basis: 100%;
  margin: 4px 0 0;
  padding: 10px 12px;
  max-height: 220px;
  overflow: auto;
  text-align: left;
  font-size: .72rem;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
}