:root {
  --bg: #e8f6f3;
  --bg2: #fef6e8;
  --card: #ffffff;
  --text: #1a2f2a;
  --muted: #4a6a62;
  --primary: #2a9d8f;
  --primary-dark: #1f7a70;
  --correct: #22c55e;
  --correct-bg: #dcfce7;
  --wrong: #ef4444;
  --wrong-bg: #fee2e2;
  --ocean: #9fd4f0;
  --land: #f4efe4;
  --land-stroke: #1e3a32;
  --hi-fill: #ff5a00;
  --hi-stroke: #3f1404;
  --shadow: 0 8px 24px rgba(30, 90, 80, 0.12);
  --radius: 20px;
  --tap: 56px;
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  font-family: var(--font);
  color: var(--text);
  background: linear-gradient(165deg, var(--bg) 0%, var(--bg2) 55%, #ffe8f0 100%);
  background-attachment: fixed;
  -webkit-tap-highlight-color: transparent;
}

body {
  min-height: 100dvh;
  display: flex;
  justify-content: center;
}

.app {
  width: 100%;
  max-width: 520px;
  min-height: 100dvh;
  padding: 16px 16px calc(20px + env(safe-area-inset-bottom));
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.screen { display: none; flex-direction: column; gap: 14px; flex: 1; }
#screen-question { gap: 10px; }
.screen.active { display: flex; }
.screen[hidden] { display: none !important; }

.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px 18px;
}

.hero {
  text-align: center;
  padding: 22px 8px 4px;
}
.hero-flags {
  font-size: 2.6rem;
  letter-spacing: 0.15em;
  margin-bottom: 8px;
}
h1 {
  margin: 0 0 8px;
  font-size: clamp(1.75rem, 6vw, 2.1rem);
  line-height: 1.2;
}
.tagline {
  margin: 0;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.45;
}

.how-to h2 {
  margin: 0 0 10px;
  font-size: 1.1rem;
}
.how-to ol {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--muted);
  line-height: 1.55;
}

.picker-label {
  margin: 0 0 10px;
  font-weight: 700;
}
.diff-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.diff-option {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 8px 6px;
  border: 2px solid #c5e4de;
  border-radius: 14px;
  background: #f3faf8;
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1.15;
  text-align: center;
  cursor: pointer;
}
.diff-option input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
  margin: 0;
}
.diff-option.is-selected {
  border-color: var(--primary);
  background: #d8f3ee;
  color: var(--primary-dark);
  box-shadow: 0 3px 0 var(--primary-dark);
}
.diff-option:focus-within {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
}
.hint {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 500;
  line-height: 1.4;
}
.hint.error { color: #b91c1c; font-weight: 700; }
.leaderboard .hint,
.review .hint { margin-top: 0; margin-bottom: 8px; }

.credit {
  margin: 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.4;
  text-align: center;
}

.round-picker { font-weight: 600; }
.round-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.round-picker select,
.save-form input {
  font: inherit;
  font-size: 1rem;
  font-weight: 600;
  padding: 12px 14px;
  min-height: var(--tap);
  border-radius: 14px;
  border: 2px solid #c5e4de;
  background: #f3faf8;
  color: var(--text);
  min-width: 150px;
}
.save-form h2,
.review h2,
.leaderboard h2 {
  margin: 0 0 10px;
  font-size: 1.1rem;
}
.save-form label {
  display: block;
  font-weight: 700;
  margin-bottom: 4px;
}
.save-hint { margin-top: 0; margin-bottom: 8px; }
.save-form input {
  display: block;
  width: 100%;
  min-width: 0;
  margin-bottom: 12px;
}
.save-done {
  margin: 0;
  font-weight: 700;
}

.btn {
  appearance: none;
  border: none;
  border-radius: 16px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  min-height: var(--tap);
  padding: 14px 22px;
  touch-action: manipulation;
  transition: transform 0.12s ease, background 0.15s ease, box-shadow 0.15s ease;
}
.btn:active { transform: scale(0.97); }
.btn:focus-visible {
  outline: 3px solid var(--primary-dark);
  outline-offset: 2px;
}
.btn-lg { font-size: 1.15rem; width: 100%; }
.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 6px 0 var(--primary-dark);
}
.btn-primary:active { box-shadow: 0 2px 0 var(--primary-dark); }
.btn-ghost {
  background: transparent;
  color: var(--muted);
  box-shadow: none;
  width: 100%;
}
.btn[hidden] { display: none !important; }

.game-bar { display: flex; flex-direction: column; gap: 8px; }
.progress-wrap {
  height: 10px;
  background: rgba(255,255,255,0.7);
  border-radius: 999px;
  overflow: hidden;
  box-shadow: inset 0 1px 3px rgba(0,0,0,0.06);
}
.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, #2a9d8f, #e9c46a);
  border-radius: 999px;
  transition: width 0.35s ease;
}
.stats {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  font-weight: 700;
  font-size: 0.95rem;
}
.diff-pill { font-size: 0.85rem; }
.diff-pill.easy { background: #dcfce7; color: #166534; }
.diff-pill.medium { background: #fef3c7; color: #92400e; }
.diff-pill.hard { background: #ffe4e6; color: #9f1239; }
.stat-pill {
  background: rgba(255,255,255,0.85);
  padding: 6px 12px;
  border-radius: 999px;
  box-shadow: var(--shadow);
}

.map-card { padding: 12px 12px 14px; }
.map-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}
.map-caption {
  margin: 0;
  font-weight: 800;
  font-size: 1.05rem;
}
.legend {
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 0;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--muted);
}
.swatch {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  background: var(--hi-fill);
  box-shadow: 0 0 0 2px #fff, 0 0 0 4px var(--hi-stroke);
  flex: none;
}
.map-frame {
  background: var(--ocean);
  border-radius: 16px;
  overflow: hidden;
  height: clamp(168px, 28vh, 300px);
  border: 2px solid #6aafcc;
}
#map {
  width: 100%;
  height: 100%;
  display: block;
  touch-action: manipulation;
}
.ocean { fill: var(--ocean); }
.country {
  fill: var(--land);
  stroke: var(--land-stroke);
  stroke-width: 1.35px;
  stroke-linejoin: round;
  stroke-linecap: round;
  fill-rule: evenodd;
  vector-effect: non-scaling-stroke;
}
.halo {
  fill: none;
  stroke: #ffffff;
  stroke-width: 8px;
  stroke-linejoin: round;
  stroke-linecap: round;
  vector-effect: non-scaling-stroke;
}
.hi {
  fill: var(--hi-fill);
  stroke: var(--hi-stroke);
  stroke-width: 4.5px;
  animation: highlight-pulse 1.35s ease-in-out infinite;
}
@keyframes highlight-pulse {
  0%, 100% { stroke-width: 4.5px; }
  50% { stroke-width: 7px; }
}

.q-prompt {
  margin: 0;
  text-align: center;
  font-size: clamp(1.25rem, 5vw, 1.5rem);
  line-height: 1.3;
}

.choices {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}
.choice {
  min-height: 56px;
  height: auto;
  padding: 12px 16px;
  border-radius: 16px;
  border: 3px solid #c5e4de;
  background: #fff;
  font: inherit;
  font-weight: 700;
  font-size: 1.12rem;
  color: var(--text);
  text-align: left;
  cursor: pointer;
  box-shadow: 0 4px 0 #a8d5cc;
  touch-action: manipulation;
  transition: transform 0.1s ease, border-color 0.15s, background 0.15s;
  display: flex;
  align-items: center;
  white-space: normal;
  line-height: 1.25;
  overflow-wrap: anywhere;
}
.choice:active:not(:disabled) { transform: scale(0.98); box-shadow: 0 2px 0 #a8d5cc; }
.choice:focus-visible {
  outline: 3px solid var(--primary-dark);
  outline-offset: 2px;
}
.choice:disabled { cursor: default; }
.choice.correct {
  border-color: var(--correct);
  background: var(--correct-bg);
  box-shadow: 0 4px 0 #16a34a;
}
.choice.wrong {
  border-color: var(--wrong);
  background: var(--wrong-bg);
  box-shadow: 0 4px 0 #dc2626;
}
.choice.dim { opacity: 0.5; }

.feedback {
  margin: 0;
  min-height: 1.4em;
  text-align: center;
  font-weight: 800;
  font-size: 1.05rem;
}
.feedback.good { color: #166534; }
.feedback.bad { color: #9f1239; }

.end-hero { text-align: center; padding: 28px 18px; margin-top: 8px; }
.end-emoji { font-size: 3.5rem; margin-bottom: 8px; }
.final-score {
  font-size: 1.4rem;
  margin: 16px 0 8px;
}
.best-streak { color: var(--muted); margin: 0; }
.end-meta {
  margin: 12px 0 0;
  font-weight: 700;
}
.end-actions { display: flex; flex-direction: column; gap: 4px; }

.review-list,
.lb-list {
  list-style: decimal;
  margin: 0;
  padding-left: 1.35rem;
}
.review-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.review-item {
  padding: 8px 10px;
  border-radius: 12px;
}
.review-item.ok { background: var(--correct-bg); }
.review-item.bad { background: var(--wrong-bg); }
.review-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
}
.review-q { font-weight: 700; overflow-wrap: anywhere; }
.review-mark { font-weight: 800; font-size: 0.85rem; }
.review-item.ok .review-mark { color: #15803d; }
.review-item.bad .review-mark { color: #b91c1c; }
.review-detail {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.35;
}
.you-picked { color: #9f1239; font-weight: 700; }

.lb-item {
  margin: 0 0 10px;
  overflow-wrap: anywhere;
}
.lb-item.is-new {
  background: #d8f3ee;
  border-radius: 10px;
  padding: 6px 8px;
}
.lb-name { display: block; font-weight: 700; }
.lb-meta {
  display: block;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 600;
  line-height: 1.35;
}
.lb-empty {
  list-style: none;
  margin-left: -1.2rem;
  color: var(--muted);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
  }
}

@media (forced-colors: active) {
  .hi {
    fill: Highlight;
    stroke: HighlightText;
  }
  .choice {
    border-color: ButtonText;
  }
}