:root {
  --ink: #16131a;
  --mute: #5c564f;
  --paper: #0f172a;
  --cobalt: #60a5fa;
  --line: #334155;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: #e2e8f0;
  background: radial-gradient(ellipse at top, #1e293b, var(--paper));
  min-height: 100vh;
}

.sample-banner {
  margin: 0;
  padding: 0.55rem 1rem;
  text-align: center;
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: #020617;
  color: #cbd5e1;
}

main { max-width: 760px; margin: 0 auto; padding: 1.5rem 1rem 3rem; }

header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}
.eyebrow {
  margin: 0 0 0.4rem;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cobalt);
}
h1 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2rem;
  letter-spacing: -0.02em;
  color: #fff;
}
.lede { margin: 0.5rem 0 0; color: #94a3b8; max-width: 28rem; line-height: 1.5; font-size: 0.95rem; }
.hud {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  font-size: 0.95rem;
}
.hud p { margin: 0; color: #94a3b8; }
.hud strong { color: #fff; font-size: 1.25rem; display: block; }

#game {
  width: 100%;
  max-width: 720px;
  height: auto;
  display: block;
  border-radius: 1rem;
  border: 1px solid var(--line);
  background: #020617;
  touch-action: none;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-top: 1rem;
}
button {
  border: 0;
  background: #2563eb;
  color: #fff;
  font: inherit;
  font-weight: 700;
  padding: 0.7rem 1.1rem;
  border-radius: 999px;
  cursor: pointer;
}
.hint { margin: 0; color: #64748b; font-size: 0.85rem; }

.explain {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}
.explain h2 {
  margin: 0 0 0.75rem;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.2rem;
  color: #fff;
}
.explain ul { margin: 0; padding-left: 1.2rem; color: #94a3b8; line-height: 1.6; }

footer {
  text-align: center;
  padding: 0 1rem 2.5rem;
  font-size: 0.8rem;
  color: #64748b;
}
footer a { color: var(--cobalt); }