:root {
  --bg: #0b0b12;
  --card: #141421;
  --ink: #f2f2f7;
  --muted: #8a8a9c;
  --accent: #7c4dff;
  --good: #2ee08b;
  --bad: #ff5470;
  font-size: 16px;
}

* { box-sizing: border-box; margin: 0; }

body {
  background: radial-gradient(circle at 50% -10%, #1b1b2c 0%, var(--bg) 60%);
  color: var(--ink);
  font-family: "Segoe UI", system-ui, sans-serif;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.stage { width: min(480px, 100%); }

.hud { display: flex; justify-content: center; gap: 0.5rem; margin-bottom: 1rem; flex-wrap: wrap; }
.hud-pill { background: var(--card); border: 1px solid #26263a; border-radius: 999px; padding: 0.4rem 0.9rem; font-size: 0.9rem; }
.hud-pill .label { color: var(--muted); margin-right: 0.35rem; }
.hud-pill .value { font-weight: 700; }
.hearts { color: var(--bad); letter-spacing: 0.1em; }

.card { background: var(--card); border: 1px solid #26263a; border-radius: 1.25rem; padding: 1.75rem 1.5rem 2rem; text-align: center; }

.progress { height: 10px; background: #222234; border-radius: 999px; overflow: hidden; margin-bottom: 1.75rem; }
.progress-fill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--accent), #b39aff); transition: width 0.25s ease; }

.question { display: inline-block; font-size: clamp(2rem, 9vw, 3rem); font-weight: 800; margin-bottom: 1.25rem; }

.options { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.6rem; }
.options button {
  background: #1a1a2b;
  border: 2px solid #2b2b45;
  border-radius: 0.75rem;
  color: var(--ink);
  cursor: pointer;
  font-size: 1.6rem;
  font-weight: 700;
  padding: 0.9rem 0.5rem;
  transition: border-color 0.12s, transform 0.1s, background 0.12s;
}
.options button:hover { border-color: var(--accent); }
.options button:active { transform: scale(0.96); }
.options button.correct { background: var(--good); border-color: var(--good); color: #04230f; }
.options button.wrong { background: var(--bad); border-color: var(--bad); color: white; }

.feedback { min-height: 1.4em; font-weight: 600; margin-top: 1rem; }
.feedback.good { color: var(--good); }
.feedback.bad { color: var(--bad); }

.overlay .big { font-size: 2rem; margin-bottom: 0.75rem; }
.overlay .stats { font-size: 1.1rem; margin-bottom: 0.35rem; }
.overlay .best { color: var(--muted); }
.overlay button {
  background: var(--accent); border: none; border-radius: 0.75rem; color: white;
  cursor: pointer; font-size: 1.05rem; font-weight: 700; margin-top: 1rem; padding: 0.75rem 1.4rem;
}
.overlay button:hover { background: #8b62ff; }

.fatal { color: var(--bad); font-family: monospace; font-size: 0.8rem; margin-top: 1rem; word-break: break-word; }
.hidden { display: none; }