:root {
  --bg: #0b0f14;
  --panel: #121826;
  --text: #e8eef6;
  --muted: #9fb0c3;
  --accent: #4ade80;
  --danger: #fb7185;
  --btn: #1e293b;
  --btn2: #2563eb;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: radial-gradient(1200px 700px at 50% -10%, #182033 0%, var(--bg) 55%);
  color: var(--text);
}

.topbar {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 12px;
  align-items: center;
  padding: 14px 16px;
  background: rgba(18,24,38,0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  position: sticky;
  top: 0;
  z-index: 10;
}

.title { font-weight: 800; letter-spacing: 0.2px; }
.stats { color: var(--muted); display: flex; gap: 12px; }
.actions { display: flex; gap: 8px; }

.btn {
  border: 1px solid rgba(255,255,255,0.12);
  background: var(--btn);
  color: var(--text);
  padding: 8px 10px;
  border-radius: 10px;
  cursor: pointer;
}
.btn-primary { background: var(--btn2); border-color: rgba(255,255,255,0.18); }

.wrap {
  display: grid;
  place-items: center;
  padding: 16px;
  gap: 14px;
}

canvas {
  width: min(92vw, 420px);
  height: min(92vw, 420px);
  max-width: 420px;
  max-height: 420px;
  background: rgba(10,14,20,0.9);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 18px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.35);
  touch-action: none; /* allow swipe handling */
}

.help {
  color: var(--muted);
  text-align: center;
  font-size: 14px;
}

.pad {
  display: grid;
  grid-template-areas:
    ". up ."
    "left down right";
  gap: 10px;
  width: min(92vw, 360px);
  user-select: none;
}

.pad-btn {
  font-size: 18px;
  padding: 14px 16px;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(30,41,59,0.9);
  color: var(--text);
}
.pad-btn:active { transform: translateY(1px); }
.up { grid-area: up; }
.left { grid-area: left; }
.down { grid-area: down; }
.right { grid-area: right; }

@media (min-width: 700px) {
  .pad { display: none; } /* desktop doesn't need on-screen pad */
}

.overlay {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(0,0,0,0.55);
  padding: 16px;
}
.hidden { display: none; }

.card {
  width: min(92vw, 420px);
  background: var(--panel);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 18px;
  padding: 16px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.45);
}
.card h2 { margin: 0 0 8px; }
.card p { margin: 0 0 12px; color: var(--muted); }
.overlay-actions { display: flex; gap: 10px; justify-content: flex-end; }