/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #0d0f14;
  --bg2:       #13161e;
  --surface:   #1c2030;
  --surface2:  #242840;
  --accent:    #e8623a;   /* 朱色 */
  --accent2:   #4db8c8;   /* 藍色 */
  --gold:      #f0c040;
  --green:     #4cce8a;
  --red:       #e84a6a;
  --text:      #eef0f8;
  --text-dim:  #7880a0;
  --radius:    14px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Noto Sans JP', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ===== 背景装飾 ===== */
.bg-deco { position: fixed; inset: 0; pointer-events: none; z-index: 0; overflow: hidden; }

.bg-circle {
  position: absolute;
  border-radius: 50%;
  opacity: 0.06;
}
.c1 {
  width: 600px; height: 600px;
  background: radial-gradient(circle, var(--accent), transparent 70%);
  top: -200px; right: -150px;
  animation: slowDrift 20s ease-in-out infinite alternate;
}
.c2 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, var(--accent2), transparent 70%);
  bottom: -150px; left: -100px;
  animation: slowDrift 25s ease-in-out infinite alternate-reverse;
}
@keyframes slowDrift {
  from { transform: translate(0, 0); }
  to   { transform: translate(30px, 20px); }
}

.bg-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.015) 1px, transparent 1px);
  background-size: 48px 48px;
}

/* ===== APP WRAPPER ===== */
.app-wrapper {
  max-width: 680px;
  margin: 0 auto;
  padding: 20px 16px 40px;
  position: relative;
  z-index: 1;
  min-height: 100vh;
}

/* ===== SCREENS ===== */
.screen { display: none; animation: fadeUp 0.35s ease; }
.screen.active { display: block; }
.hidden { display: none !important; }
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ===== SITE NAV ===== */
.site-nav { margin-bottom: 4px; }
.btn-site-top {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.8rem;
  padding: 6px 14px;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 8px;
  transition: all 0.2s;
}
.btn-site-top:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(232,98,58,0.06);
}

/* ===== TITLE SCREEN ===== */
.title-header {
  text-align: center;
  padding: 28px 0 32px;
}
.title-emblem {
  display: inline-block;
  animation: floatY 3.5s ease-in-out infinite;
}
@keyframes floatY {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-8px); }
}
.title-main {
  font-family: 'Kaisei Decol', serif;
  font-size: clamp(2.2rem, 8vw, 3.6rem);
  background: linear-gradient(135deg, var(--accent), #f0a070, var(--gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 3px;
  margin-top: 10px;
}
.title-sub {
  color: var(--text-dim);
  font-size: 0.88rem;
  letter-spacing: 4px;
  margin-top: 6px;
}

/* ===== SECTION BLOCK ===== */
.section-block { margin-bottom: 24px; }
.section-label {
  font-size: 0.72rem;
  letter-spacing: 3px;
  color: var(--accent2);
  text-transform: uppercase;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: rgba(255,255,255,0.06);
}

/* ===== MODE CARDS ===== */
.mode-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.mode-card {
  background: var(--surface);
  border: 2px solid transparent;
  border-radius: var(--radius);
  padding: 0;
  cursor: pointer;
  transition: all 0.22s;
  text-align: center;
  color: var(--text);
  overflow: hidden;
}
.mode-card-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 24px 16px;
}
.mode-card--region { border-color: rgba(77,184,200,0.2); }
.mode-card--random  { border-color: rgba(232,98,58,0.2); }
.mode-card--region:hover, .mode-card--region.active {
  border-color: var(--accent2);
  background: rgba(77,184,200,0.08);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(77,184,200,0.15);
}
.mode-card--random:hover, .mode-card--random.active {
  border-color: var(--accent);
  background: rgba(232,98,58,0.08);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(232,98,58,0.15);
}
.mode-icon { font-size: 2rem; }
.mode-name { font-weight: 700; font-size: 1rem; }
.mode-desc { font-size: 0.76rem; color: var(--text-dim); }

/* ===== REGION GRID ===== */
.region-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  animation: fadeUp 0.3s ease;
}
.region-btn {
  background: var(--surface);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 10px;
  padding: 12px 8px;
  color: var(--text-dim);
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
}
.region-btn:hover, .region-btn.active {
  background: var(--surface2);
  border-color: var(--accent2);
  color: var(--accent2);
}

/* ===== DIFFICULTY CARDS ===== */
.diff-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.diff-card {
  background: var(--surface);
  border: 2px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: 16px 8px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: var(--text-dim);
  font-family: 'Noto Sans JP', sans-serif;
  transition: all 0.2s;
}
.diff-card.active, .diff-card:hover {
  border-color: var(--accent);
  color: var(--text);
  background: rgba(232,98,58,0.08);
}
.diff-icon { font-size: 1.5rem; }
.diff-name { font-weight: 700; font-size: 0.9rem; }
.diff-desc { font-size: 0.7rem; color: var(--text-dim); text-align: center; line-height: 1.4; }

/* ===== START BUTTON ===== */
.start-row { text-align: center; margin-top: 8px; }
.btn-start {
  background: linear-gradient(135deg, var(--accent), #f07850);
  border: none;
  border-radius: 999px;
  padding: 16px 48px;
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 1.05rem;
  font-weight: 900;
  color: #fff;
  cursor: pointer;
  transition: all 0.25s;
  letter-spacing: 1px;
  box-shadow: 0 4px 20px rgba(232,98,58,0.3);
}
.btn-start:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(232,98,58,0.45);
}
.btn-start:disabled {
  background: var(--surface2);
  color: var(--text-dim);
  cursor: not-allowed;
  box-shadow: none;
}

/* ===== QUIZ SCREEN ===== */
.quiz-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}
.btn-quit {
  background: transparent;
  border: 1px solid rgba(255,255,255,0.12);
  color: var(--text-dim);
  padding: 6px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 0.8rem;
  transition: all 0.2s;
}
.btn-quit:hover { border-color: var(--red); color: var(--red); }

.quiz-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 4px;
}
.q-num { font-size: 0.9rem; color: var(--text-dim); }
.mode-badge {
  font-size: 0.7rem;
  background: rgba(77,184,200,0.15);
  border: 1px solid rgba(77,184,200,0.3);
  color: var(--accent2);
  padding: 2px 10px;
  border-radius: 999px;
}

/* TIMER */
.timer-wrap {
  height: 5px;
  background: rgba(255,255,255,0.07);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 6px;
}
.timer-bar {
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--green), var(--accent2));
  border-radius: 999px;
  transition: width 1s linear, background 0.5s;
}
.timer-bar.warning { background: linear-gradient(90deg, var(--gold), var(--red)); }
.timer-text {
  text-align: right;
  font-size: 0.78rem;
  color: var(--text-dim);
  margin-bottom: 22px;
}
#timer-count { font-weight: 700; color: var(--accent2); }

/* QUESTION */
.quiz-content { position: relative; }
.question-prompt {
  text-align: center;
  font-size: 0.8rem;
  color: var(--accent);
  letter-spacing: 3px;
  text-transform: uppercase;
  margin-bottom: 14px;
  font-weight: 700;
}
.question-city {
  background: var(--surface);
  border: 1px solid rgba(232,98,58,0.2);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  margin-bottom: 20px;
  min-height: 110px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}
.city-name {
  font-family: 'Kaisei Decol', serif;
  font-size: clamp(1.8rem, 6vw, 2.8rem);
  font-weight: 700;
  color: var(--text);
  letter-spacing: 2px;
}
.city-diff-badge {
  font-size: 0.7rem;
  color: var(--text-dim);
  letter-spacing: 2px;
}

/* OPTIONS */
.options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.option-btn {
  background: var(--surface);
  border: 2px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: 16px 12px;
  cursor: pointer;
  color: var(--text);
  font-family: 'Noto Sans JP', sans-serif;
  font-size: clamp(0.88rem, 2.5vw, 1rem);
  font-weight: 700;
  transition: all 0.16s;
  min-height: 64px;
  text-align: center;
}
.option-btn:hover:not(:disabled) {
  background: var(--surface2);
  border-color: var(--accent2);
  transform: scale(1.02);
}
.option-btn.correct {
  background: rgba(76,206,138,0.15);
  border-color: var(--green);
  color: var(--green);
  animation: popGreen 0.35s ease;
}
.option-btn.wrong {
  background: rgba(232,74,106,0.12);
  border-color: var(--red);
  color: var(--red);
}
@keyframes popGreen {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.04); }
  100% { transform: scale(1); }
}

/* FEEDBACK */
.feedback-overlay {
  position: absolute;
  inset: 0;
  background: rgba(13,15,20,0.9);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  backdrop-filter: blur(6px);
  animation: fadeUp 0.18s ease;
  pointer-events: none;
}
.feedback-icon { font-size: 3.5rem; animation: bounceIn 0.35s cubic-bezier(.36,.07,.19,.97); }
@keyframes bounceIn {
  0%   { transform: scale(0); }
  70%  { transform: scale(1.2); }
  100% { transform: scale(1); }
}
.feedback-text { font-size: 1.3rem; font-weight: 900; }
.feedback-text.correct { color: var(--green); }
.feedback-text.wrong   { color: var(--red); }
.feedback-answer { color: var(--text-dim); font-size: 0.88rem; }

/* ===== RESULT SCREEN ===== */
.result-container {
  max-width: 520px;
  margin: 0 auto;
  padding: 24px 0 40px;
}
.result-rank {
  font-size: 4.5rem;
  text-align: center;
  margin-bottom: 6px;
  animation: floatY 3s ease-in-out infinite;
}
.result-title {
  font-family: 'Kaisei Decol', serif;
  font-size: 1.5rem;
  text-align: center;
  color: var(--accent);
  margin-bottom: 20px;
  letter-spacing: 3px;
}
.result-score-block {
  background: var(--surface);
  border: 1px solid rgba(232,98,58,0.2);
  border-radius: 20px;
  padding: 24px;
  text-align: center;
  margin-bottom: 16px;
}
.result-score-row {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 6px;
}
.result-num {
  font-family: 'Kaisei Decol', serif;
  font-size: clamp(3rem, 12vw, 5rem);
}
.correct-num { color: var(--green); }
.result-slash { font-size: 1.8rem; color: var(--text-dim); }
.result-total { font-size: 1.8rem; color: var(--text-dim); }
.result-score-label { font-size: 0.8rem; color: var(--text-dim); letter-spacing: 3px; margin-top: 4px; }

.result-stats {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-bottom: 20px;
}
.stat-item { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.stat-num { font-family: 'Kaisei Decol', serif; font-size: 1.6rem; color: var(--accent2); }
.stat-label { font-size: 0.74rem; color: var(--text-dim); }

/* 間違えた問題リスト */
.wrong-list-wrap {
  background: var(--surface);
  border: 1px solid rgba(232,74,106,0.2);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 20px;
}
.wrong-list-title {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--red);
  margin-bottom: 12px;
  letter-spacing: 1px;
}
.wrong-list { display: flex; flex-direction: column; gap: 8px; }
.wrong-item {
  background: var(--bg2);
  border-radius: 10px;
  padding: 10px 14px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.88rem;
}
.wrong-city {
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
  min-width: 80px;
}
.wrong-arrow { color: var(--text-dim); }
.wrong-correct {
  color: var(--green);
  font-weight: 700;
  white-space: nowrap;
}
.wrong-your {
  color: var(--red);
  font-size: 0.78rem;
  margin-top: 2px;
}
.wrong-detail { display: flex; flex-direction: column; }

/* AdSense 結果画面 */
.ad-result {
  margin: 16px 0;
  min-height: 0;
}
.ad-result ins { display: block; width: 100%; }

/* ===== RESULT BUTTONS ===== */
.result-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 8px;
}
.btn-primary, .btn-secondary {
  padding: 13px 32px;
  border-radius: 999px;
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), #f07850);
  border: none;
  color: #fff;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(232,98,58,0.4);
}
.btn-secondary {
  background: transparent;
  border: 2px solid rgba(255,255,255,0.18);
  color: var(--text);
}
.btn-secondary:hover {
  border-color: var(--text);
  transform: translateY(-2px);
}

/* ===== ADSENSE 下部 ===== */
.ad-bottom-wrap {
  max-width: 680px;
  margin: 0 auto;
  padding: 8px 16px 16px;
  position: relative;
  z-index: 1;
}
.ad-bottom-wrap ins { display: block; width: 100%; }

/* ===== RESPONSIVE ===== */
@media (max-width: 480px) {
  .mode-grid { grid-template-columns: 1fr 1fr; }
  .diff-cards { grid-template-columns: repeat(3, 1fr); }
  .region-grid { grid-template-columns: repeat(2, 1fr); }
  .options-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
  .option-btn { font-size: 0.82rem; padding: 12px 8px; min-height: 56px; }
}
@media (max-width: 360px) {
  .diff-cards { grid-template-columns: 1fr; }
  .options-grid { grid-template-columns: 1fr; }
}