:root {
  color-scheme: dark;
  --bg-1: #050816;
  --bg-2: #0e1537;
  --panel: rgba(10, 16, 35, 0.72);
  --panel-border: rgba(255, 255, 255, 0.12);
  --text-main: #f6f8ff;
  --text-dim: #a8b5d6;
  --accent: #61f3ff;
  --accent-2: #a96dff;
  --danger: #ff4d8d;
  --shadow: 0 30px 90px rgba(0, 0, 0, 0.42);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text-main);
  background:
    radial-gradient(circle at top, rgba(97, 243, 255, 0.16), transparent 28%),
    radial-gradient(circle at bottom, rgba(169, 109, 255, 0.16), transparent 30%),
    linear-gradient(180deg, var(--bg-2), var(--bg-1) 72%);
}
.app-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}
.panel {
  width: min(100%, 560px);
  padding: 16px;
  border-radius: 28px;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}
.topbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
  padding: 0 8px;
}
.label { margin: 0 0 4px; color: var(--text-dim); font-size: 13px; }
.value { margin: 0; font-size: 28px; font-weight: 800; }
.game-wrap {
  position: relative;
  overflow: hidden;
  border-radius: 24px;
}
canvas {
  display: block;
  width: 100%;
  height: auto;
  background: linear-gradient(180deg, #071125 0%, #0a2044 52%, #050814 100%);
}
.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(4, 8, 22, 0.46);
  transition: opacity 180ms ease;
}
.overlay.hidden { opacity: 0; pointer-events: none; }
.overlay.visible { opacity: 1; }
.card {
  width: min(100%, 340px);
  padding: 24px;
  border-radius: 24px;
  background: rgba(9, 16, 34, 0.8);
  border: 1px solid rgba(255,255,255,0.14);
  backdrop-filter: blur(18px);
  text-align: center;
}
.eyebrow {
  margin: 0 0 8px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
}
h1, h2 { margin: 0 0 10px; }
.description, .hint { margin: 0; color: var(--text-dim); line-height: 1.6; }
.hint { margin-top: 14px; font-size: 13px; }
.actions { margin-top: 18px; }
.primary-btn {
  width: 100%;
  border: 0;
  border-radius: 999px;
  padding: 14px 18px;
  font-size: 16px;
  font-weight: 800;
  color: #04111e;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  cursor: pointer;
}
.primary-btn:hover { filter: brightness(1.03); }
@media (max-width: 640px) {
  .app-shell { padding: 12px; }
  .panel { padding: 12px; border-radius: 20px; }
  .value { font-size: 24px; }
  .card { padding: 20px; }
}