:root {
  --tiifa: #5CC1C6;
  --tiifa-dark: #3DA8AD;
  --tiifa-light: #E8F7F8;
  --navy: #1A3A5C;
  --red: #EF4444;
  --green: #10B981;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-500: #6B7280;
  --gray-700: #374151;
  --shadow-card: 0 8px 24px rgba(26, 58, 92, 0.10);
  --shadow-card-strong: 0 18px 38px rgba(26, 58, 92, 0.14), 0 4px 10px rgba(26, 58, 92, 0.06);
  --font: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; }
body {
  font-family: var(--font);
  background: linear-gradient(135deg, #E8F7F8 0%, #D1F0F2 40%, #B8E8EB 100%);
  min-height: 100vh;
  color: var(--navy);
  -webkit-tap-highlight-color: transparent;
  -webkit-font-smoothing: antialiased;
}

.app {
  max-width: 480px;
  margin: 0 auto;
  min-height: 100vh;
  padding: 16px 16px 40px;
}

/* ========== ふりがな(ruby)表示 — CSS制御方式（相良案踏襲） ========== */
ruby { ruby-position: over; }
ruby rt {
  font-size: .55em;
  font-weight: 600;
  letter-spacing: 0;
  color: var(--tiifa-dark);
}
body.no-ruby rt { display: none; }

/* ========== ヘッダー ========== */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 4px 16px;
}
.app-logo {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--navy);
}
.app-logo span { color: var(--tiifa-dark); }
.app-version {
  font-size: 11px;
  color: var(--gray-500);
  font-weight: 600;
}
.back-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.9);
  border: 2px solid var(--tiifa);
  cursor: pointer;
  margin-right: 8px;
}
.back-btn svg { width: 18px; height: 18px; stroke: var(--tiifa-dark); }

/* ========== スタート画面 ========== */
.hero-card {
  background: white;
  border-radius: 24px;
  padding: 24px 24px;
  margin-bottom: 14px;
  box-shadow: var(--shadow-card);
  text-align: center;
}
.hero-title {
  font-size: 28px;
  font-weight: 900;
  letter-spacing: 0.02em;
  margin-bottom: 4px;
  color: var(--navy);
}
.hero-title span { color: var(--tiifa); }
.hero-subtitle {
  font-size: 12px;
  color: var(--gray-500);
  font-weight: 600;
}
.hero-bubble {
  background: var(--tiifa-light);
  border: 2px solid rgba(92,193,198,0.35);
  border-radius: 16px;
  padding: 14px 16px;
  margin-top: 14px;
  font-size: 13px;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.6;
}
.hero-bubble strong { color: var(--tiifa-dark); }

.section-card {
  background: white;
  border-radius: 18px;
  padding: 16px 18px;
  margin-bottom: 12px;
  box-shadow: var(--shadow-card);
}
.section-label {
  font-size: 13px;
  font-weight: 800;
  color: var(--gray-500);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.section-label::before {
  content: '';
  display: inline-block;
  width: 4px;
  height: 14px;
  background: var(--tiifa);
  border-radius: 2px;
}

/* 単元選択 — チェックボックス（縦リスト） */
.era-grid {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.era-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 14px;
  background: white;
  border: 1.5px solid rgba(92, 193, 198, 0.35);
  border-radius: 12px;
  cursor: pointer;
  user-select: none;
  transition: all 0.15s ease;
  font-size: 14px;
  font-weight: 700;
  color: var(--navy);
}
.era-item:active { transform: scale(0.99); }
.era-item.selected {
  background: var(--tiifa-light);
  border-color: var(--tiifa);
}
.era-checkbox {
  width: 22px;
  height: 22px;
  border: 2px solid rgba(92, 193, 198, 0.55);
  border-radius: 6px;
  background: white;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.15s ease;
}
.era-item.selected .era-checkbox {
  background: var(--tiifa);
  border-color: var(--tiifa);
}
.era-checkbox svg { display: none; }
.era-item.selected .era-checkbox svg {
  display: block;
  width: 14px;
  height: 14px;
  stroke: white;
  stroke-width: 3;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.era-name { flex: 1; }
.era-count {
  font-size: 12px;
  font-weight: 700;
  opacity: 0.7;
  color: var(--gray-700);
}

/* モード選択（セグメント） */
.mode-segment {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  background: var(--gray-100);
  border-radius: 12px;
  padding: 4px;
}
.mode-option {
  padding: 12px 14px;
  text-align: center;
  font-size: 14px;
  font-weight: 700;
  border-radius: 9px;
  cursor: pointer;
  user-select: none;
  color: var(--gray-700);
  transition: all 0.15s ease;
}
.mode-option.active {
  background: white;
  color: var(--tiifa-dark);
  box-shadow: 0 2px 6px rgba(26, 58, 92, 0.08);
}
.mode-desc {
  font-size: 11px;
  color: var(--gray-500);
  margin-top: 8px;
  font-weight: 500;
  text-align: center;
}

/* ふりがな / タイマー トグル */
.ruby-toggle-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.ruby-toggle-label {
  font-size: 14px;
  font-weight: 700;
  color: var(--navy);
}
.ruby-toggle-sub {
  font-size: 11px;
  color: var(--gray-500);
  margin-top: 2px;
  font-weight: 600;
}
.ruby-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--gray-100);
  border: 1.5px solid rgba(92, 193, 198, 0.35);
  font-size: 12px;
  font-weight: 800;
  color: var(--navy);
  cursor: pointer;
  user-select: none;
}
.ruby-toggle input {
  accent-color: var(--tiifa);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

/* スタートボタン */
.start-button {
  width: 100%;
  padding: 18px;
  background: linear-gradient(135deg, var(--tiifa) 0%, var(--tiifa-dark) 100%);
  color: white;
  border: none;
  border-radius: 16px;
  font-size: 17px;
  font-weight: 900;
  letter-spacing: 0.06em;
  cursor: pointer;
  margin-top: 8px;
  box-shadow: 0 6px 16px rgba(92, 193, 198, 0.4);
  font-family: var(--font);
  transition: all 0.15s ease;
}
.start-button:active {
  transform: translateY(1px);
  box-shadow: 0 3px 10px rgba(92, 193, 198, 0.4);
}
.start-button:disabled {
  background: var(--gray-300);
  box-shadow: none;
  cursor: not-allowed;
  color: var(--gray-500);
}

.start-warning {
  text-align: center;
  font-size: 12px;
  color: var(--red);
  margin-bottom: 8px;
  font-weight: 700;
  display: none;
}
.start-warning.show { display: block; }

/* ========== カウントダウン画面 ========== */
.countdown-display {
  height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 200px;
  font-weight: 900;
  color: var(--tiifa-dark);
  font-family: var(--font);
  animation: countdown-pulse 0.9s ease-out;
}
.countdown-display.go-text {
  font-size: 64px;
  letter-spacing: 0.12em;
  color: var(--tiifa);
  animation: go-text-pop 0.5s ease-out;
}
@keyframes countdown-pulse {
  0% { transform: scale(0.5); opacity: 0; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(1); opacity: 1; }
}
@keyframes go-text-pop {
  0% { transform: scale(0.7); opacity: 0; }
  60% { transform: scale(1.1); opacity: 1; }
  100% { transform: scale(1); opacity: 1; }
}

/* ========== クイズ共通ヘッダー ========== */
.quiz-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: white;
  border-radius: 14px;
  padding: 10px 16px;
  margin-bottom: 14px;
  box-shadow: var(--shadow-card);
}
.quiz-progress { font-size: 13px; font-weight: 700; color: var(--navy); }
.quiz-progress strong { font-size: 18px; color: var(--tiifa-dark); }
.quiz-timer {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 15px;
  font-weight: 800;
  color: var(--navy);
  transition: color 0.2s ease;
}
.quiz-timer svg { width: 16px; height: 16px; stroke: var(--tiifa-dark); fill: none; stroke-width: 2.5; }
.quiz-timer.timer-warn {
  color: var(--red);
  animation: timer-pulse 0.7s ease-in-out infinite;
}
.quiz-timer.timer-warn svg { stroke: var(--red); }
@keyframes timer-pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.08); }
}
.quiz-timer.timer-over {
  color: #F97316;
  background: rgba(249, 115, 22, 0.08);
  padding: 4px 10px;
  border-radius: 999px;
  margin: -4px -6px -4px 0;
}
.quiz-timer.timer-over svg { stroke: #F97316; }

/* ========== 問題文 fieldset 風枠 ========== */
.q-frame {
  position: relative;
  margin: 14px 0 4px;
  padding: 20px 18px 18px;
  border: 2px solid var(--tiifa);
  border-radius: 14px;
  background: rgba(232, 247, 248, 0.45);
}
.q-frame-legend {
  position: absolute;
  top: -11px;
  left: 14px;
  display: inline-block;
  background: var(--tiifa);
  color: white;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.12em;
  padding: 3px 12px;
  border-radius: 999px;
  box-shadow: 0 2px 6px rgba(61, 168, 173, 0.25);
}
.question-text {
  font-size: 17px;
  line-height: 1.75;
  font-weight: 700;
  color: var(--navy);
}

.era-badge {
  display: inline-block;
  background: white;
  color: var(--tiifa-dark);
  font-size: 11px;
  font-weight: 800;
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 8px;
  border: 1px solid rgba(92, 193, 198, 0.35);
}

/* ========== 四択モード ========== */
.choices-mc {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 16px;
}
.choice-mc {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: white;
  border: 2px solid var(--gray-200);
  border-radius: 14px;
  cursor: pointer;
  user-select: none;
  transition: all 0.15s ease;
  text-align: left;
  font-family: var(--font);
  position: relative;
}
.choice-mc:active { transform: scale(0.98); }
.choice-mc:hover {
  background: var(--tiifa-light);
  border-color: var(--tiifa);
}
.choice-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--tiifa-light);
  color: var(--tiifa-dark);
  font-size: 14px;
  font-weight: 900;
  flex-shrink: 0;
}
.choice-text {
  flex: 1;
  font-size: 15px;
  font-weight: 700;
  color: var(--navy);
}
.choice-mc.correct {
  background: rgba(16, 163, 74, 0.10);
  border-color: var(--green);
}
.choice-mc.correct .choice-num {
  background: var(--green);
  color: white;
}
.choice-mc.wrong {
  background: rgba(239, 68, 68, 0.08);
  border-color: var(--red);
}
.choice-mc.wrong .choice-num {
  background: var(--red);
  color: white;
}
.choice-mc.disabled { pointer-events: none; opacity: 0.8; }
.choice-mc.picked::before {
  content: 'あなたの回答';
  position: absolute;
  top: -10px;
  right: 12px;
  background: var(--navy);
  color: white;
  font-size: 9.5px;
  font-weight: 900;
  letter-spacing: 0.06em;
  padding: 2px 10px;
  border-radius: 999px;
  white-space: nowrap;
  box-shadow: 0 2px 5px rgba(26, 58, 92, 0.2);
}
.choice-mc.picked.correct::before { background: var(--green); }
.choice-mc.picked.wrong::before { background: var(--red); }
.choice-mc.disabled:not(.correct):not(.picked):not(.wrong) {
  opacity: 0.4;
  filter: saturate(0.5);
}

/* ========== 〇×モード — カードスタック＋スワイプ ========== */
.card-stack {
  position: relative;
  margin: 6px 0 18px;
}
.card-stack-back, .card-stack-mid {
  position: absolute;
  inset: 0;
  background: white;
  border-radius: 22px;
  border: 1px solid rgba(92, 193, 198, 0.22);
  pointer-events: none;
  box-shadow: 0 12px 24px rgba(26, 58, 92, 0.07);
}
.card-stack-back {
  transform: translateY(18px) scale(0.93);
  opacity: 0.5;
  z-index: 0;
}
.card-stack-mid {
  transform: translateY(9px) scale(0.965);
  opacity: 0.8;
  z-index: 1;
}

.ox-card {
  position: relative;
  z-index: 2;
  cursor: grab;
  user-select: none;
  -webkit-user-select: none;
  touch-action: pan-y;
  transition: transform 0.25s ease;
  will-change: transform;
  background: white;
  border-radius: 22px;
  border: 1.5px solid rgba(92, 193, 198, 0.32);
  box-shadow: var(--shadow-card-strong);
  min-height: 280px;
  display: flex;
  flex-direction: column;
  padding: 18px 18px 22px;
}
.ox-card.swiping {
  transition: none;
  cursor: grabbing;
}
.ox-card.no-transition {
  transition: none !important;
}
.ox-card.fade-in {
  animation: ox-card-fade-in 0.3s ease-out;
}
@keyframes ox-card-fade-in {
  0% { opacity: 0; transform: translateY(20px) scale(0.95); }
  100% { opacity: 1; transform: translateY(0) scale(1); }
}
.ox-card.fly-right {
  transform: translateX(135%) rotate(20deg) !important;
  opacity: 0;
  transition: transform 0.35s ease, opacity 0.35s ease;
}
.ox-card.fly-left {
  transform: translateX(-135%) rotate(-20deg) !important;
  opacity: 0;
  transition: transform 0.35s ease, opacity 0.35s ease;
}
.ox-card .q-frame {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  margin-top: 16px;
}
.ox-card .question-text {
  font-size: 17px;
  line-height: 1.75;
  text-align: left;
  font-weight: 700;
}
.ox-card .ox-answer {
  display: inline-block;
  margin-top: 4px;
  font-size: 16px;
  color: var(--navy);
  font-weight: 700;
}
.ox-card .ox-answer strong {
  color: var(--tiifa-dark);
  font-weight: 900;
}

.ox-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.12s;
}
.ox-card[data-hint="maru"]::after {
  opacity: 1;
  background: rgba(16, 185, 129, 0.1);
  border: 3px solid var(--green);
  border-radius: 22px;
}
.ox-card[data-hint="batsu"]::after {
  opacity: 1;
  background: rgba(239, 68, 68, 0.1);
  border: 3px solid var(--red);
  border-radius: 22px;
}

.swipe-hint {
  position: absolute;
  top: 50%;
  padding: 6px 18px;
  border: 5px solid;
  border-radius: 14px;
  font-size: 48px;
  font-weight: 900;
  line-height: 1;
  background: rgba(255, 255, 255, 0.92);
  opacity: 0;
  transition: opacity 0.12s, transform 0.12s;
  pointer-events: none;
  z-index: 5;
}
.swipe-hint.maru {
  left: 18px;
  color: var(--green);
  border-color: var(--green);
  transform: translateY(-50%) rotate(-15deg) scale(0.85);
}
.swipe-hint.batsu {
  right: 18px;
  color: var(--red);
  border-color: var(--red);
  transform: translateY(-50%) rotate(15deg) scale(0.85);
}
.ox-card[data-hint="maru"] .swipe-hint.maru {
  opacity: 1;
  transform: translateY(-50%) rotate(-15deg) scale(1);
}
.ox-card[data-hint="batsu"] .swipe-hint.batsu {
  opacity: 1;
  transform: translateY(-50%) rotate(15deg) scale(1);
}

/* 〇×ボタン */
.ox-choices {
  display: flex;
  flex-direction: row;
  gap: 14px;
  padding: 2px 0;
  margin-top: 4px;
}
.ox-btn {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 22px 0;
  border-radius: 20px;
  border: 2.5px solid;
  background: white;
  cursor: pointer;
  font-family: var(--font);
  transition: transform 0.1s ease, box-shadow 0.1s ease, opacity 0.2s ease;
}
.ox-btn:active { transform: scale(0.95); }
.ox-btn:disabled { pointer-events: none; }
.ox-btn.disabled-unselected {
  opacity: 0.18;
  filter: saturate(0.3);
}
.ox-mark {
  font-size: 52px;
  font-weight: 900;
  line-height: 1;
}
.ox-maru {
  border-color: var(--green);
  color: var(--green);
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.18);
}
.ox-batsu {
  border-color: var(--red);
  color: var(--red);
  box-shadow: 0 4px 14px rgba(239, 68, 68, 0.18);
}
.ox-btn.picked::after {
  content: 'あなたの回答';
  position: absolute;
  top: -11px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--navy);
  color: white;
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.08em;
  padding: 3px 12px;
  border-radius: 999px;
  white-space: nowrap;
  box-shadow: 0 2px 6px rgba(26, 58, 92, 0.25);
}
.ox-btn.picked.correct {
  background: rgba(16, 185, 129, 0.18);
  border-color: var(--green);
  color: var(--green);
  box-shadow: 0 6px 18px rgba(16, 185, 129, 0.35);
  border-width: 3px;
}
.ox-btn.picked.correct .ox-mark {
  color: var(--green);
}
.ox-btn.picked.correct::after {
  background: var(--green);
}
.ox-btn.picked.wrong {
  background: rgba(239, 68, 68, 0.18);
  border-color: var(--red);
  color: var(--red);
  box-shadow: 0 6px 18px rgba(239, 68, 68, 0.35);
  border-width: 3px;
}
.ox-btn.picked.wrong .ox-mark {
  color: var(--red);
}
.ox-btn.picked.wrong::after {
  background: var(--red);
}
.ox-btn.is-correct-answer {
  background: var(--gray-100);
  border-color: var(--gray-300);
  color: var(--gray-300);
  box-shadow: none;
}
.ox-btn.is-correct-answer .ox-mark {
  color: var(--gray-300);
}
.ox-btn.is-correct-answer::after {
  content: '正解はこちら';
  position: absolute;
  top: -11px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--green);
  color: white;
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.08em;
  padding: 3px 12px;
  border-radius: 999px;
  white-space: nowrap;
  box-shadow: 0 2px 6px rgba(16, 185, 129, 0.35);
}

/* ========== フィードバック ========== */
.feedback {
  background: white;
  border-radius: 16px;
  padding: 16px 18px;
  margin: 14px 0;
  display: none;
  box-shadow: var(--shadow-card);
  border-left: 5px solid var(--tiifa);
  transition: background 0.2s ease;
}
.feedback.show { display: block; }
.feedback.correct {
  background: #DCFCE7;
  border-left-color: var(--green);
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-left: 5px solid var(--green);
}
.feedback.wrong {
  background: #FEE2E2;
  border-left-color: var(--red);
  border: 1px solid rgba(239, 68, 68, 0.25);
  border-left: 5px solid var(--red);
}
.feedback-result {
  font-size: 16px;
  font-weight: 900;
  margin-bottom: 6px;
}
.feedback.correct .feedback-result { color: var(--green); }
.feedback.wrong .feedback-result { color: var(--red); }
.feedback-answer {
  font-size: 14px;
  color: var(--gray-700);
  font-weight: 500;
  line-height: 1.6;
}
.feedback-answer strong { color: var(--tiifa-dark); font-weight: 900; }
.correctness-true {
  color: var(--green);
  font-weight: 900;
  letter-spacing: 0.04em;
}
.correctness-false {
  color: var(--red);
  font-weight: 900;
  letter-spacing: 0.04em;
}
.correctness-mark {
  display: inline-block;
  font-size: 0.95em;
  margin-left: 2px;
  vertical-align: -1px;
}

.next-button {
  position: relative;
  overflow: hidden;
  width: 100%;
  padding: 16px;
  background: var(--tiifa-dark);
  color: white;
  border: none;
  border-radius: 14px;
  font-size: 15px;
  font-weight: 900;
  letter-spacing: 0.06em;
  cursor: pointer;
  font-family: var(--font);
  display: none;
}
.next-button.show { display: block; }
.next-button:active { transform: translateY(1px); }

.next-button::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.20);
  transform-origin: left center;
  transform: scaleX(0);
  pointer-events: none;
  z-index: 0;
}
.next-button.auto-progress::before {
  animation: next-btn-auto-progress 5s linear forwards;
}
@keyframes next-btn-auto-progress {
  from { transform: scaleX(1); }
  to   { transform: scaleX(0); }
}
.next-button .next-button-label {
  position: relative;
  z-index: 1;
}

/* ========== 結果画面 ========== */
.result-hero {
  background: white;
  border-radius: 24px;
  padding: 30px 24px;
  text-align: center;
  margin-bottom: 14px;
  box-shadow: var(--shadow-card);
}
.result-icon {
  font-size: 60px;
  margin-bottom: 8px;
}
.result-title {
  font-size: 22px;
  font-weight: 900;
  color: var(--navy);
  margin-bottom: 4px;
}
.result-score-label {
  font-size: 12px;
  color: var(--gray-500);
  font-weight: 800;
  margin-top: 12px;
  margin-bottom: 6px;
}
.result-score-value {
  font-size: 56px;
  font-weight: 900;
  color: var(--tiifa-dark);
  line-height: 1;
}
.result-score-value span { font-size: 32px; color: var(--gray-500); }
.result-time {
  margin-top: 10px;
  font-size: 13px;
  color: var(--navy);
  font-weight: 700;
}

.result-list {
  background: white;
  border-radius: 18px;
  padding: 16px;
  margin-bottom: 14px;
  box-shadow: var(--shadow-card);
}
.result-list-title {
  font-size: 13px;
  font-weight: 800;
  color: var(--gray-500);
  margin-bottom: 10px;
}
.result-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 0;
  border-top: 1px solid var(--gray-100);
  font-size: 13px;
  line-height: 1.55;
}
.result-item:first-child { border-top: none; }
.result-mark {
  font-size: 20px;
  font-weight: 900;
  flex-shrink: 0;
  width: 24px;
  text-align: center;
  margin-top: -1px;
}
.result-mark.o { color: var(--green); }
.result-mark.x { color: var(--red); }
.result-q {
  flex: 1;
  color: var(--navy);
  font-weight: 500;
}
.result-q .answer-line {
  margin-top: 4px;
  font-size: 12px;
  color: var(--gray-700);
}
.result-q .answer-line strong { color: var(--tiifa-dark); }

.button-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.button-row button {
  padding: 14px;
  border-radius: 14px;
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
  border: 2px solid var(--tiifa);
  font-family: var(--font);
}
.button-primary { background: var(--tiifa); color: white; }
.button-secondary { background: white; color: var(--tiifa-dark); }

@media (max-width: 360px) {
  .question-text { font-size: 15px; }
  .choice-text { font-size: 13px; }
  .ox-mark { font-size: 44px; }
}

/* ========== カウントダウンオーバーレイ (start.html内) ========== */
.countdown-overlay {
  position: fixed;
  inset: 0;
  background: linear-gradient(135deg, #E8F7F8 0%, #D1F0F2 40%, #B8E8EB 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.countdown-overlay[hidden] { display: none; }
.countdown-overlay .countdown-display {
  height: auto;
}

/* ========== 結果画面のタイム表示ヘルパー ========== */
.result-time-over {
  color: #F97316;
  font-size: 0.85em;
}
.result-time-badge {
  color: var(--gray-700);
  font-weight: 800;
}
.result-time-badge-over {
  color: #F97316;
  font-weight: 800;
}