:root {
  --bg: #0f172a;
  --panel: #111827;
  --accent: #22c55e;
  --danger: #ef4444;
  --text: #e5e7eb;
  --muted: #94a3b8;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  background: linear-gradient(180deg, #0b1022, #0f172a 30%, #0f172a 100%);
  color: var(--text);
}

.container {
  max-width: 980px;
  margin: 1.25rem auto;
  padding: 0 1rem;
}

h1 {
  margin: 1rem 0 0.25rem;
  font-size: clamp(1.1rem, 2.5vw, 1.6rem);
}

.sub {
  margin: 0 0 1rem;
  color: var(--muted);
}

.controls {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: center;
  margin-bottom: 1rem;
}

.dpad {
  display: grid;
  grid-template-rows: auto auto auto;
  gap: 0.5rem;
  place-items: center;
}

.dpad button {
  width: 64px;
  height: 48px;
  font-size: 1.25rem;
  border: 0;
  border-radius: 12px;
  background: #1f2937;
  color: var(--text);
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease;
}
.dpad button:hover { transform: translateY(-2px); background: #273449; }

.middle-row {
  display: grid;
  grid-template-columns: repeat(2, 64px);
  gap: 0.5rem;
}

.actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: flex-start;
}

.actions button {
  padding: 0.6rem 0.9rem;
  border: 0;
  border-radius: 10px;
  background: #1f2937;
  color: var(--text);
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease;
}
.actions button:hover { transform: translateY(-2px); background: #273449; }
.actions .danger { background: #2a1b1d; }
.actions .danger:hover { background: #3a2225; color: #ffd9d9; }

.stage-wrap {
  background: #0b1220;
  border-radius: 14px;
  padding: 1rem;
  box-shadow: 0 0 0 1px #1f2937 inset, 0 6px 24px rgba(0,0,0,0.45);
}

#stage {
  position: relative;
  height: 420px;
  background: #0b1220;
  border-radius: 12px;
  outline: 1px solid #1f2937;
  overflow: hidden; /* keep boxes inside */
}

/* Movable square */
#player {
  position: absolute;
  top: 170px;  /* centered-ish to start */
  left: 210px;
  width: 80px;
  height: 80px;
  background: var(--accent);
  border-radius: 14px;
  box-shadow: 0 10px 24px rgba(34, 197, 94, 0.35);
}

/* Chaining demo box */
#chainBox {
  position: absolute;
  right: 20px;
  bottom: 20px;
  width: 100px;
  height: 50px;
  line-height: 50px;
  text-align: center;
  background: #334155;
  color: #e5e7eb;
  border-radius: 10px;
  user-select: none;
}

.status {
  margin-top: 0.75rem;
  font-size: 0.95rem;
  color: var(--muted);
}