:root {
  --bg: #f4f6fb;
  --bg-alt: #ffffff;
  --text: #1a2233;
  --text-dim: #5b6478;
  --border: #e1e5ee;
  --accent: #3355ff;
  --accent-dim: #e8ecff;
  --accent-glow: rgba(51, 85, 255, 0.16);
  --accent-glow2: rgba(224, 57, 122, 0.12);
  --good: #1a9e5c;
  --good-bg: #e3f7ec;
  --bad: #e0473d;
  --bad-bg: #fdecea;
  --shadow: 0 2px 10px rgba(20, 30, 60, 0.06);
  --radius: 14px;
  --tint1-bg: #e8ecff; --tint1-fg: #3355ff;
  --tint2-bg: #ffe8f3; --tint2-fg: #e0397a;
  --tint3-bg: #e5faf1; --tint3-fg: #12a37a;
  --tint4-bg: #fff4e0; --tint4-fg: #c47a12;
  --tint5-bg: #f1e8ff; --tint5-fg: #7a3ce0;
  --tint6-bg: #e0f7ff; --tint6-fg: #1090c4;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f131c;
    --bg-alt: #171d2b;
    --text: #eef1f8;
    --text-dim: #9aa3b8;
    --border: #262e42;
    --accent: #6c85ff;
    --accent-dim: #1c2545;
    --accent-glow: rgba(108, 133, 255, 0.18);
    --accent-glow2: rgba(255, 110, 180, 0.1);
    --good: #35c281;
    --good-bg: #113325;
    --bad: #ff6b61;
    --bad-bg: #3a1717;
    --shadow: 0 2px 14px rgba(0, 0, 0, 0.35);
    --tint1-bg: #1c2545; --tint1-fg: #93a6ff;
    --tint2-bg: #3a1c2c; --tint2-fg: #ff8fc0;
    --tint3-bg: #123326; --tint3-fg: #5fe0b0;
    --tint4-bg: #3a2c10; --tint4-fg: #f0c060;
    --tint5-bg: #241a3d; --tint5-fg: #b494ff;
    --tint6-bg: #10303f; --tint6-fg: #6fd3ff;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", Inter, Roboto, Helvetica, Arial, sans-serif;
  min-height: 100%;
}

body {
  background-image:
    radial-gradient(circle at 12% 0%, var(--accent-glow) 0%, transparent 40%),
    radial-gradient(circle at 88% 12%, var(--accent-glow2) 0%, transparent 38%);
  background-repeat: no-repeat;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

button, input, select {
  font-family: inherit;
  color: inherit;
}

a { color: var(--accent); }

/* Topbar */
.topbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px 18px;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: saturate(1.4) blur(6px);
}
.topbar::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--tint2-fg), var(--tint6-fg));
  opacity: 0.6;
}

.brand {
  display: flex;
  align-items: center;
  gap: 8px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  padding: 6px 4px;
  border-radius: 8px;
  transition: opacity 0.15s ease;
}
.brand:hover { opacity: 0.8; }
.brand-emoji { font-size: 1.3rem; transition: transform 0.2s ease; }
.brand:hover .brand-emoji { transform: rotate(-8deg) scale(1.08); }

.tabs { display: flex; gap: 4px; }
.tab {
  border: none;
  background: transparent;
  color: var(--text-dim);
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.92rem;
}
.tab { transition: background 0.15s ease, color 0.15s ease; }
.tab:hover { background: var(--accent-dim); color: var(--text); }
.tab.active { background: var(--accent); color: #fff; box-shadow: 0 2px 10px rgba(51, 85, 255, 0.35); }

.topbar-score {
  margin-left: auto;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--accent);
}

/* Layout */
.app {
  flex: 1;
  width: 100%;
  max-width: 980px;
  margin: 0 auto;
  padding: 24px 18px 48px;
}

.footer {
  text-align: center;
  padding: 14px;
  font-size: 0.78rem;
  color: var(--text-dim);
}
.footer a { color: var(--text-dim); }

/* Home */
.hero {
  text-align: center;
  margin: 8px 0 28px;
}
.hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.3rem);
  margin: 0 0 8px;
  letter-spacing: -0.01em;
  background: linear-gradient(90deg, var(--text) 30%, var(--accent) 85%, var(--tint2-fg) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p {
  color: var(--text-dim);
  margin: 0;
  font-size: 1.02rem;
}

.section-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1rem;
  font-weight: 700;
  margin: 28px 0 12px;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.section-title::before {
  content: "";
  width: 4px;
  height: 14px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--accent), var(--tint2-fg));
}

.mode-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 14px;
}

.mode-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  text-align: left;
  cursor: pointer;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
  animation: fadeInUp 0.35s ease both;
}
.mode-card:hover { transform: translateY(-3px); border-color: var(--accent); box-shadow: 0 10px 24px rgba(20, 30, 60, 0.14); }
.mode-card:active { transform: translateY(-1px); }
.mode-card .emoji {
  font-size: 1.5rem;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-dim);
  border-radius: 12px;
  margin-bottom: 4px;
  transition: transform 0.2s ease;
}
.mode-card:hover .emoji { transform: scale(1.08) rotate(-4deg); }
.mode-card h3 { margin: 0; font-size: 1.05rem; }
.mode-card p { margin: 0; color: var(--text-dim); font-size: 0.87rem; line-height: 1.35; }
.mode-card .best {
  margin-top: 6px;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent);
}
.mode-card.review {
  border-color: var(--accent);
  background: linear-gradient(135deg, var(--accent-dim) 0%, var(--bg-alt) 70%);
}
.mode-card.review .emoji { background: var(--accent); }

#mode-grid .mode-card:nth-child(6n+1) .emoji { background: var(--tint1-bg); color: var(--tint1-fg); }
#mode-grid .mode-card:nth-child(6n+2) .emoji { background: var(--tint2-bg); color: var(--tint2-fg); }
#mode-grid .mode-card:nth-child(6n+3) .emoji { background: var(--tint3-bg); color: var(--tint3-fg); }
#mode-grid .mode-card:nth-child(6n+4) .emoji { background: var(--tint4-bg); color: var(--tint4-fg); }
#mode-grid .mode-card:nth-child(6n+5) .emoji { background: var(--tint5-bg); color: var(--tint5-fg); }
#mode-grid .mode-card:nth-child(6n+6) .emoji { background: var(--tint6-bg); color: var(--tint6-fg); }
.mode-grid .mode-card:nth-child(1) { animation-delay: 0.02s; }
.mode-grid .mode-card:nth-child(2) { animation-delay: 0.06s; }
.mode-grid .mode-card:nth-child(3) { animation-delay: 0.1s; }
.mode-grid .mode-card:nth-child(4) { animation-delay: 0.14s; }
.mode-grid .mode-card:nth-child(5) { animation-delay: 0.18s; }
.mode-grid .mode-card:nth-child(6) { animation-delay: 0.22s; }

.filters-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 6px;
}

.pill-group { display: flex; flex-wrap: wrap; gap: 6px; }
.pill {
  border: 1px solid var(--border);
  background: var(--bg-alt);
  color: var(--text-dim);
  padding: 6px 13px;
  border-radius: 999px;
  font-size: 0.83rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.1s ease, background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
.pill:hover:not(.active) { border-color: var(--accent); color: var(--text); }
.pill.active { background: var(--accent); border-color: var(--accent); color: #fff; box-shadow: 0 2px 8px rgba(51, 85, 255, 0.3); }
.pill:active { transform: scale(0.96); }

/* Quiz screen */
.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
  gap: 10px;
  flex-wrap: wrap;
}
.progress-bar {
  flex: 1;
  height: 7px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
  min-width: 120px;
}
.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--tint2-fg));
  transition: width 0.25s ease;
}
.quiz-stat { font-size: 0.85rem; color: var(--text-dim); font-weight: 600; white-space: nowrap; }

.chrono-timer {
  font-size: 1rem;
  font-weight: 800;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 4px 12px;
  border-radius: 999px;
  white-space: nowrap;
}
.chrono-timer.low {
  color: #fff;
  background: var(--bad);
  animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.08); }
}

.question-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 20px;
  text-align: center;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
  animation: fadeInUp 0.3s ease both;
}
.question-label {
  color: var(--text-dim);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 14px;
}
.question-flag {
  width: min(260px, 80vw);
  border-radius: 8px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.question-text {
  font-size: clamp(1.4rem, 5vw, 2rem);
  font-weight: 800;
}
.question-sub { color: var(--text-dim); margin-top: 6px; }

.options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  counter-reset: opt;
}

.option-btn {
  background: var(--bg-alt);
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  gap: 12px;
  transition: transform 0.12s ease, border-color 0.12s ease, box-shadow 0.12s ease, background 0.2s ease, color 0.2s ease;
  animation: fadeInUp 0.3s ease both;
}
.options-grid .option-btn:nth-child(1) { animation-delay: 0.02s; }
.options-grid .option-btn:nth-child(2) { animation-delay: 0.06s; }
.options-grid .option-btn:nth-child(3) { animation-delay: 0.1s; }
.options-grid .option-btn:nth-child(4) { animation-delay: 0.14s; }
.option-btn::before {
  counter-increment: opt;
  content: counter(opt, upper-alpha);
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--accent-dim);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease, color 0.2s ease;
}
.option-btn:hover:not(:disabled) { border-color: var(--accent); transform: translateY(-2px); box-shadow: 0 6px 16px rgba(20, 30, 60, 0.1); }
.option-btn:disabled { cursor: default; }
.option-btn.correct { background: var(--good-bg); border-color: var(--good); color: var(--good); transform: none; animation: pop 0.25s ease; }
.option-btn.correct::before { background: var(--good); color: #fff; }
.option-btn.wrong { background: var(--bad-bg); border-color: var(--bad); color: var(--bad); transform: none; }
.option-btn.wrong::before { background: var(--bad); color: #fff; }
.option-btn.dim { opacity: 0.5; transform: none; }

@keyframes pop {
  0% { transform: scale(1); }
  50% { transform: scale(1.03); }
  100% { transform: scale(1); }
}

.feedback-banner {
  text-align: center;
  font-weight: 700;
  margin-top: 14px;
  min-height: 1.4em;
}
.feedback-banner.good { color: var(--good); }
.feedback-banner.bad { color: var(--bad); }

.mistake-fact {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  font-weight: 500;
  margin-top: 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 14px;
}

.actions-row {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.btn {
  border: none;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  padding: 11px 22px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 0.95rem;
  transition: transform 0.1s ease, filter 0.15s ease, box-shadow 0.15s ease;
  box-shadow: 0 2px 10px rgba(51, 85, 255, 0.25);
}
.btn:hover { filter: brightness(1.08); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn.secondary {
  background: var(--bg-alt);
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: none;
}
.btn.secondary:hover { border-color: var(--accent); }
.btn:disabled { opacity: 0.5; cursor: default; transform: none; }

/* Map */
#map-canvas {
  width: 100%;
  height: 460px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: #cfe3f5;
  box-shadow: var(--shadow);
}
@media (prefers-color-scheme: dark) {
  #map-canvas { background: #10243d; }
}
.leaflet-container { border-radius: var(--radius); font-family: inherit; }

.silhouette-canvas {
  width: 100%;
  height: 220px;
  margin: 6px auto 0;
}
.silhouette-canvas.leaflet-container { background: transparent; }

/* Result screen */
.result-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 24px;
  text-align: center;
  box-shadow: var(--shadow);
  animation: fadeInUp 0.35s ease both;
}
.result-emoji {
  font-size: 3rem;
  width: 88px;
  height: 88px;
  line-height: 88px;
  margin: 0 auto 6px;
  background: var(--accent-dim);
  border-radius: 50%;
  animation: float 2.4s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}
.result-score {
  font-size: 2.6rem;
  font-weight: 800;
  margin: 6px 0;
  background: linear-gradient(90deg, var(--text) 30%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.result-sub { color: var(--text-dim); margin-bottom: 18px; }
.result-newbest {
  display: inline-block;
  background: var(--good-bg);
  color: var(--good);
  font-weight: 700;
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 14px;
  font-size: 0.85rem;
  animation: bounceIn 0.5s ease both;
}
@keyframes bounceIn {
  0% { transform: scale(0.7); opacity: 0; }
  60% { transform: scale(1.08); opacity: 1; }
  100% { transform: scale(1); }
}

/* Explore */
.explore-toolbar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 16px;
  align-items: center;
}
.search-input {
  flex: 1;
  min-width: 180px;
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-alt);
  color: var(--text);
  font-size: 0.95rem;
}
.search-input { transition: border-color 0.15s ease, box-shadow 0.15s ease; }
.search-input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }

.country-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px;
}
.country-card {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px;
  cursor: pointer;
  text-align: left;
  transition: transform 0.12s ease, border-color 0.12s ease, box-shadow 0.12s ease;
}
.country-card:hover { border-color: var(--accent); transform: translateY(-2px); box-shadow: 0 6px 16px rgba(20, 30, 60, 0.1); }
.country-card img { width: 34px; height: 24px; object-fit: cover; border-radius: 3px; flex-shrink: 0; box-shadow: 0 1px 3px rgba(0,0,0,0.2); }
.country-card .cname { font-weight: 700; font-size: 0.92rem; }
.country-card .ccap { color: var(--text-dim); font-size: 0.78rem; }

.detail-back {
  background: none;
  border: none;
  color: var(--accent);
  font-weight: 700;
  cursor: pointer;
  padding: 6px 0;
  margin-bottom: 10px;
  font-size: 0.9rem;
}

.detail-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}
.detail-header img { width: 96px; border-radius: 8px; border: 1px solid var(--border); box-shadow: var(--shadow); }
.detail-header h2 { margin: 0 0 4px; }
.detail-header .official { color: var(--text-dim); font-size: 0.9rem; }

.detail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}
.detail-item {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
}
.detail-item .label { color: var(--text-dim); font-size: 0.75rem; text-transform: uppercase; font-weight: 700; letter-spacing: 0.03em; margin-bottom: 4px; }
.detail-item .value { font-weight: 600; }
.detail-item .value a { font-weight: 600; text-decoration: none; }

#detail-map { width: 100%; height: 300px; border-radius: var(--radius); border: 1px solid var(--border); margin-bottom: 10px; }

.empty-state { text-align: center; color: var(--text-dim); padding: 40px 10px; }

.map-hint { text-align: center; color: var(--text-dim); font-size: 0.85rem; margin-top: 10px; }

@media (max-width: 560px) {
  .topbar { padding: 8px 10px; }
  .brand-name { display: none; }
  #map-canvas { height: 360px; }
}