:root {
  --bg: #0f1115;
  --panel: #1e2430;
  --panel-border: #2f394a;
  --accent: #ffcc00;
  --accent-alt: #ff8b00;
  --text: #f0f4f8;
  --danger: #ff4d61;
  --radius: 12px;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

body {
  margin: 0;
  background: radial-gradient(circle at 50% 30%, #18202b, var(--bg));
  color: var(--text);
  display: flex;
  justify-content: center;
  min-height: 100dvh;
  padding: 8px;
}

.game-shell {
  width: min(100%, 440px);
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: stretch;
}

header, footer {
  text-align: center;
}

h1 {
  margin: 4px 0 2px;
  font-size: 1.4rem;
  letter-spacing: 0.05em;
}

canvas {
  width: 100%;
  height: auto;
  background: linear-gradient(#5ec9ff, #48a3f5 60%, #3e8ad6 90%);
  border: 3px solid var(--panel-border);
  border-radius: var(--radius);
  display: block;
  touch-action: none;
  user-select: none;
  image-rendering: pixelated;
}

.scoreboard {
  display: flex;
  gap: 16px;
  justify-content: center;
  font-size: 0.95rem;
  opacity: 0.9;
}

footer p {
  font-size: 0.7rem;
  opacity: 0.6;
  margin: 0;
}

.overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  backdrop-filter: blur(4px);
}

.hidden {
  display: none !important;
}

.panel {
  background: var(--panel);
  border: 2px solid var(--panel-border);
  padding: 24px 28px 32px;
  border-radius: var(--radius);
  max-width: 320px;
  width: 92%;
  text-align: center;
  box-shadow: 0 8px 32px -8px rgba(0,0,0,0.55), 0 2px 6px -2px rgba(0,0,0,0.4);
}

.panel h2 {
  margin-top: 0;
  margin-bottom: 0.4em;
  font-size: 1.4rem;
}

.panel p {
  margin-top: 0;
  margin-bottom: 1.2em;
  font-size: 0.9rem;
  line-height: 1.3;
  opacity: 0.85;
}

button {
  font: inherit;
  cursor: pointer;
  padding: 10px 20px;
  background: var(--panel-border);
  color: var(--text);
  border: 2px solid var(--panel-border);
  border-radius: 999px;
  font-weight: 600;
  letter-spacing: 0.5px;
  margin: 4px 6px;
  min-width: 120px;
  transition: background 0.25s, transform 0.15s;
}

button.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-alt));
  color: #222;
  border: none;
  box-shadow: 0 4px 12px -4px rgba(0,0,0,0.6);
}

button.secondary {
  background: #2d3846;
}

button:hover, button:focus-visible {
  outline: none;
  background: var(--accent-alt);
  color: #222;
}

button.secondary:hover, button.secondary:focus-visible {
  background: #39485a;
  color: #fff;
}

button:active {
  transform: translateY(2px);
}

@media (max-height: 700px) {
  .panel {
    padding: 18px 22px 24px;
  }
  canvas {
    max-height: 60vh;
  }
}