:root {
  color-scheme: dark;
  --bg-1: #07111f;
  --bg-2: #133258;
  --panel: rgba(11, 21, 40, 0.72);
  --panel-border: rgba(255, 255, 255, 0.12);
  --text-main: #f7fbff;
  --text-dim: #b7c6da;
  --accent: #69d2ff;
  --accent-2: #8effc9;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.35);
}

* {
  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(105, 210, 255, 0.18), transparent 32%),
    linear-gradient(180deg, var(--bg-2), var(--bg-1) 70%);
}

.app-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.panel {
  width: min(100%, 560px);
  padding: 16px;
  border: 1px solid var(--panel-border);
  background: var(--panel);
  backdrop-filter: blur(18px);
  border-radius: 28px;
  box-shadow: var(--shadow);
}

.hud {
  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;
  border-radius: 24px;
  overflow: hidden;
}

canvas {
  width: 100%;
  height: auto;
  display: block;
  background: linear-gradient(180deg, #8ee3ff 0%, #73c7ff 45%, #daf5ff 100%);
}

.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(4, 12, 24, 0.42);
  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;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(6, 14, 26, 0.72);
  backdrop-filter: blur(18px);
  text-align: center;
}

.eyebrow {
  margin: 0 0 8px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-2);
  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: #03111f;
  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;
  }
}