:root {
  --bg: #0f1622;
  --bg-alt: #18243a;
  --accent: #e4b34c;
  --accent-dark: #b4862d;
  --red: #d33f3f;
  --green: #1aab5e;
  --blue: #5fb5ff;
  --text: #f3efe6;
  --text-dim: #9aa7bd;
  --card: rgba(255, 255, 255, 0.04);
  --card-border: rgba(255, 255, 255, 0.1);
  --font-sans: "Hiragino Sans", "Yu Gothic", "Meiryo", system-ui, sans-serif;
  --font-display: "Yu Mincho", "Hiragino Mincho ProN", "Noto Serif JP", serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: linear-gradient(180deg, #0a0f1a 0%, #1a2740 100%);
  color: var(--text);
  font-family: var(--font-sans);
  -webkit-tap-highlight-color: transparent;
  -webkit-text-size-adjust: 100%;
}

#app {
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  padding: 16px 16px 40px;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* ヘッダー */
.kq-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 6px 2px 14px;
}

.kq-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.5rem;
  letter-spacing: 0.04em;
}

.kq-title .accent {
  color: var(--accent);
}

.kq-stats {
  display: flex;
  gap: 14px;
  font-size: 0.85rem;
  color: var(--text-dim);
}

.kq-stat-value {
  color: var(--text);
  font-weight: 700;
}

/* 残りライフ(ハート) */
#statLives {
  letter-spacing: 2px;
}

.kq-life {
  color: var(--red);
}

.kq-life.lost {
  color: var(--text-dim);
}

/* 難易度バッジ */
.kq-level {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  padding: 2px 12px;
  border-radius: 999px;
  margin-bottom: 12px;
  border: 1px solid var(--card-border);
}

.kq-level.lv1 {
  color: var(--green);
  border-color: rgba(26, 171, 94, 0.5);
  background: rgba(26, 171, 94, 0.12);
}

.kq-level.lv2 {
  color: var(--blue);
  border-color: rgba(95, 181, 255, 0.5);
  background: rgba(95, 181, 255, 0.12);
}

.kq-level.lv3 {
  color: var(--accent);
  border-color: rgba(228, 179, 76, 0.5);
  background: rgba(228, 179, 76, 0.12);
}

/* タイマーバー */
.kq-timer-wrap {
  height: 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
  margin-bottom: 18px;
}

.kq-timer-bar {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--green), var(--accent));
  transition: width 100ms linear, background 200ms ease;
}

.kq-timer-bar.danger {
  background: linear-gradient(90deg, var(--accent), var(--red));
}

/* 進行表示 */
.kq-progress {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 10px;
  letter-spacing: 0.05em;
}

/* 問題 */
.kq-question {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 800;
  line-height: 1.5;
  min-height: 4.2em;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
}

.kq-countdown {
  font-size: 2.4rem;
  font-weight: 900;
  text-align: right;
  color: var(--accent);
  margin-bottom: 6px;
  font-variant-numeric: tabular-nums;
}

.kq-countdown.danger {
  color: var(--red);
}

/* 選択肢 */
.kq-choices {
  display: grid;
  gap: 12px;
  margin-top: 8px;
}

.kq-choice {
  appearance: none;
  width: 100%;
  text-align: left;
  padding: 16px 18px;
  border-radius: 14px;
  border: 1px solid var(--card-border);
  background: var(--card);
  color: var(--text);
  font-size: 1.1rem;
  font-weight: 700;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: transform 80ms ease, border-color 120ms ease, background 120ms ease;
  display: flex;
  align-items: center;
  gap: 12px;
}

.kq-choice:not(:disabled):hover {
  border-color: var(--accent);
  background: rgba(228, 179, 76, 0.1);
}

.kq-choice:not(:disabled):active {
  transform: scale(0.98);
}

.kq-choice .kq-choice-key {
  flex: 0 0 auto;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  display: grid;
  place-items: center;
  font-size: 0.85rem;
  color: var(--accent);
}

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

.kq-choice.correct {
  border-color: var(--green);
  background: rgba(26, 171, 94, 0.22);
}

.kq-choice.wrong {
  border-color: var(--red);
  background: rgba(211, 63, 63, 0.2);
}

.kq-choice.dimmed {
  opacity: 0.45;
}

/* 出題後のフィードバック */
.kq-feedback {
  margin-top: 16px;
  min-height: 1.6em;
  text-align: center;
  font-weight: 800;
  font-size: 1.05rem;
}

.kq-feedback.ok {
  color: var(--green);
}

.kq-feedback.ng {
  color: var(--red);
}

.kq-gain {
  color: var(--accent);
  font-size: 0.9rem;
  margin-left: 8px;
}

/* モーダル(タイトル / 結果) */
.kq-modal {
  background: var(--bg-alt);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 24px 20px 28px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.4);
}

.kq-modal.hidden {
  display: none;
}

.kq-modal h1 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 900;
}

.kq-modal h1 .accent {
  color: var(--accent);
}

.kq-modal h2 {
  font-family: var(--font-display);
}

.kq-modal p {
  color: var(--text-dim);
  line-height: 1.7;
  font-size: 0.95rem;
}

.rules {
  margin: 14px 0;
  padding-left: 20px;
  color: var(--text-dim);
  font-size: 0.88rem;
  line-height: 1.75;
}

.rules strong {
  color: var(--accent);
}

.kq-button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.kq-button {
  appearance: none;
  border: none;
  border-radius: 999px;
  padding: 13px 26px;
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
  text-decoration: none;
  background: linear-gradient(180deg, var(--accent), var(--accent-dark));
  color: #2b2118;
  transition: transform 80ms ease, filter 120ms ease;
}

.kq-button:active {
  transform: scale(0.97);
}

.kq-button.secondary {
  background: transparent;
  border: 1px solid var(--card-border);
  color: var(--text);
}

.kq-button-tiny {
  appearance: none;
  border: 1px solid var(--card-border);
  background: transparent;
  color: var(--text-dim);
  border-radius: 999px;
  padding: 4px 14px;
  font-size: 0.8rem;
  cursor: pointer;
}

/* 結果グリッド */
.kq-result-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 16px;
  margin: 16px 0;
  font-size: 1rem;
}

.kq-result-grid .label {
  color: var(--text-dim);
}

.kq-result-grid .value {
  text-align: right;
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.kq-result-grid .value.score {
  color: var(--accent);
  font-size: 1.3rem;
}

/* 名前入力 */
.kq-name-input {
  display: flex;
  gap: 8px;
  margin: 14px 0 6px;
}

.kq-name-input input {
  flex: 1;
  min-width: 0;
  padding: 11px 14px;
  border-radius: 12px;
  border: 1px solid var(--card-border);
  background: rgba(0, 0, 0, 0.25);
  color: var(--text);
  font-size: 1rem;
}

.kq-name-input input:disabled {
  opacity: 0.6;
}

#submitStatus {
  min-height: 1.3em;
  font-size: 0.88rem;
  margin: 2px 0 0;
}

/* ランキング */
.kq-ranking-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 22px;
}

.kq-ranking-header h2 {
  margin: 0;
  font-size: 1.2rem;
}

.kq-ranking-status {
  font-size: 0.82rem;
  color: var(--text-dim);
  margin: 8px 0;
}

.kq-ranking {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.kq-rank-row {
  display: grid;
  grid-template-columns: 36px 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: 10px;
  background: var(--card);
  border: 1px solid var(--card-border);
  font-size: 0.95rem;
}

.kq-rank-row.me {
  border-color: var(--accent);
  background: rgba(228, 179, 76, 0.12);
}

.kq-rank-pos {
  font-weight: 900;
  color: var(--accent);
  text-align: center;
}

.kq-rank-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.kq-rank-score {
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

@media (max-width: 480px) {
  .kq-question {
    font-size: 1.25rem;
  }
  .kq-stats {
    gap: 10px;
    font-size: 0.78rem;
  }
}