:root {
  --bg: #eef2f6;
  --card: #ffffff;
  --ink: #0f172a;
  --ink-soft: #334155;
  --muted: #64748b;
  --border: #e6ebf1;
  --green: #16a34a;
  --green-dark: #15803d;
  --green-soft: #dcfce7;
  --yellow: #facc15;
  --red: #ef4444;
  --red-soft: #fee2e2;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06), 0 2px 8px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 8px 30px rgba(15, 23, 42, 0.10);
  --radius: 20px;
  --radius-sm: 14px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ---------- background decoration ---------- */
.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background:
    radial-gradient(1200px 600px at 15% -10%, rgba(22, 163, 74, 0.10), transparent 60%),
    radial-gradient(1000px 500px at 110% 15%, rgba(250, 204, 21, 0.12), transparent 55%),
    var(--bg);
}
.blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.5;
}
.blob-1 {
  width: 420px; height: 420px;
  background: rgba(22, 163, 74, 0.35);
  top: -140px; left: -120px;
}
.blob-2 {
  width: 380px; height: 380px;
  background: rgba(250, 204, 21, 0.40);
  bottom: -160px; right: -100px;
}

/* ---------- layout ---------- */
.app {
  max-width: 1080px;
  margin: 0 auto;
  padding: 28px 20px 56px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

/* ---------- header ---------- */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand { display: flex; align-items: center; gap: 14px; }
.brand-badge {
  font-size: 30px;
  line-height: 1;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 10px 12px;
  box-shadow: var(--shadow-sm);
}
.brand-text h1 {
  margin: 0;
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.02em;
}
.brand-text p {
  margin: 2px 0 0;
  font-size: 13.5px;
  color: var(--muted);
  font-weight: 500;
}

/* ---------- buttons ---------- */
.ghost-btn {
  font: inherit;
  font-weight: 600;
  font-size: 14px;
  color: var(--ink-soft);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 16px;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease, box-shadow 0.15s ease;
  box-shadow: var(--shadow-sm);
}
.ghost-btn:hover { background: #f8fafc; transform: translateY(-1px); }
.ghost-btn:active { transform: translateY(0); }

.primary-btn {
  font: inherit;
  font-weight: 700;
  font-size: 15px;
  color: #fff;
  background: linear-gradient(135deg, var(--green), var(--green-dark));
  border: none;
  border-radius: 14px;
  padding: 14px 26px;
  cursor: pointer;
  transition: transform 0.12s ease, box-shadow 0.15s ease, filter 0.15s ease;
  box-shadow: 0 10px 24px rgba(22, 163, 74, 0.35);
}
.primary-btn:hover { transform: translateY(-2px); filter: brightness(1.03); }
.primary-btn:active { transform: translateY(0); }

/* ---------- stats ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.stat {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.stat-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.stat-value {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.stat-value.bump { animation: bump 0.4s ease; }
@keyframes bump {
  0% { transform: scale(1); }
  40% { transform: scale(1.22); color: var(--green); }
  100% { transform: scale(1); }
}

/* ---------- play area ---------- */
.play { display: flex; flex-direction: column; gap: 18px; }

.prompt-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 22px;
  flex-wrap: wrap;
}
.prompt-eyebrow {
  margin: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.ddd {
  font-size: 64px;
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
  background: linear-gradient(135deg, #0f172a, #334155);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.ddd.pulse { animation: dddpulse 0.5s ease; }
@keyframes dddpulse {
  0% { transform: scale(0.9); opacity: 0.4; }
  100% { transform: scale(1); opacity: 1; }
}

/* ---------- map ---------- */
.map-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.map {
  width: 100%;
  max-width: 560px;
}
.map svg {
  width: 100%;
  height: auto;
  display: block;
}

/* state styling */
.state {
  fill: #e7edf3;
  stroke: #ffffff;
  stroke-width: 1.2;
  cursor: pointer;
  transition: fill 0.15s ease, filter 0.15s ease;
}
.state:hover { fill: #c9d4e0; }
.state.correct { fill: var(--green); }
.state.wrong { fill: var(--red); }
.state.reveal { fill: var(--yellow); }
.state.dim { fill: #eef2f6; opacity: 0.55; }

/* tooltip */
.tooltip {
  position: fixed;
  z-index: 50;
  pointer-events: none;
  background: rgba(15, 23, 42, 0.92);
  color: #fff;
  font-size: 12.5px;
  font-weight: 600;
  padding: 6px 10px;
  border-radius: 8px;
  transform: translate(-50%, -140%);
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.1s ease;
}
.tooltip.show { opacity: 1; }

/* feedback */
.feedback {
  min-height: 46px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border-radius: var(--radius-sm);
  padding: 12px 18px;
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  transition: background 0.2s ease, color 0.2s ease;
  background: #f1f5f9;
  color: var(--ink-soft);
}
.feedback.idle { background: #f1f5f9; color: var(--muted); }
.feedback.success { background: var(--green-soft); color: var(--green-dark); }
.feedback.error { background: var(--red-soft); color: #b91c1c; }
.feedback .fb-icon { font-size: 18px; line-height: 1; }
.feedback strong { font-weight: 800; }

/* ---------- footer ---------- */
.footer p {
  margin: 0;
  text-align: center;
  font-size: 12.5px;
  color: var(--muted);
}

/* ---------- overlay ---------- */
.overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadein 0.25s ease;
}
.overlay[hidden] { display: none; }
@keyframes fadein { from { opacity: 0; } to { opacity: 1; } }
.overlay-card {
  background: var(--card);
  border-radius: 24px;
  padding: 38px 34px;
  width: 100%;
  max-width: 400px;
  text-align: center;
  box-shadow: 0 30px 80px rgba(15, 23, 42, 0.4);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  animation: pop 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}
@keyframes pop { from { transform: scale(0.9); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.overlay-emoji { font-size: 52px; line-height: 1; }
.overlay-card h2 { margin: 0; font-size: 24px; font-weight: 800; letter-spacing: -0.02em; }
.overlay-score { margin: 0; font-size: 16px; color: var(--ink-soft); }
.overlay-score strong { color: var(--green); font-size: 20px; }
.overlay-msg { margin: 0; font-size: 14px; color: var(--muted); min-height: 20px; }
.overlay-card .primary-btn { margin-top: 8px; }

/* ---------- responsive ---------- */
@media (max-width: 640px) {
  .app { padding: 20px 14px 44px; gap: 16px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .ddd { font-size: 52px; }
  .header { flex-direction: column; align-items: flex-start; }
  .brand-text h1 { font-size: 20px; }
}