:root {
  --bg-a: #1a1a2e;
  --bg-b: #16213e;
  --bg-c: #0f3460;
  --accent: #4ecca3;
  --accent-2: #36a2eb;
  --warn: #e94560;
  --text: #eeeeee;
  --muted: #9aa4b2;
  --pmpc-green: #7ac143;
  --pmpc-blue: #1b6ec2;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
}

body {
  background: linear-gradient(160deg, var(--bg-a) 0%, var(--bg-b) 55%, var(--bg-c) 100%);
  background-attachment: fixed;
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  touch-action: manipulation;
  -webkit-text-size-adjust: 100%;
}

.topbar {
  flex: 0 0 auto;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.topbar h1 {
  margin: 0;
  font-size: 17px;
  letter-spacing: 0.5px;
  color: var(--pmpc-green);
}

.topbar .tagline {
  font-size: 12px;
  color: var(--muted);
}

.topbar .spacer { flex: 1 1 auto; }

.topbar a {
  color: var(--accent);
  text-decoration: none;
  font-size: 13px;
  border: 1px solid rgba(78, 204, 163, 0.35);
  border-radius: 6px;
  padding: 4px 10px;
  white-space: nowrap;
}

.topbar a:hover {
  background: rgba(78, 204, 163, 0.12);
}

/*
 * The canvas is taken out of flow so its own size can never feed back into
 * the size of the box it is being measured against.
 */
.stage {
  position: relative;
  flex: 1 1 auto;
  min-height: 0;
}

/*
 * No pixel snapping here, unlike the pixel-art game next door. The board is
 * drawn as vectors at device resolution, so smoothing is what keeps it sharp.
 */
.stage canvas {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  display: block;
  border-radius: 10px;
  box-shadow: 0 10px 34px rgba(0, 0, 0, 0.5);
  cursor: pointer;
  touch-action: none;
}

.hud {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 10px 16px calc(10px + env(safe-area-inset-bottom, 0px));
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(0, 0, 0, 0.18);
}

.legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 14px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 11px;
  letter-spacing: 0.6px;
  color: var(--muted);
}

.legend li {
  display: flex;
  align-items: center;
  gap: 5px;
  cursor: help;
}

.legend i {
  width: 9px;
  height: 9px;
  border-radius: 50% 50% 2px 2px;
  display: inline-block;
}

.legend .hint {
  color: var(--pmpc-green);
  cursor: default;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
}

.controls label {
  font-size: 12px;
  color: var(--muted);
}

.controls input {
  width: 190px;
  padding: 7px 10px;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
}

.controls input:focus {
  outline: none;
  border-color: var(--accent);
}

.controls button {
  padding: 7px 14px;
  border-radius: 6px;
  border: 1px solid rgba(78, 204, 163, 0.45);
  background: rgba(78, 204, 163, 0.14);
  color: var(--accent);
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
}

.controls button:hover {
  background: rgba(78, 204, 163, 0.24);
}

.status {
  flex: 1 1 240px;
  font-size: 12px;
  color: var(--muted);
  min-height: 16px;
}

.status.good { color: var(--accent); }
.status.bad { color: var(--warn); }

@media (max-width: 620px) {
  .topbar .tagline { display: none; }
  .legend .hint { display: none; }
  .controls input { width: 140px; }
  .status { flex-basis: 100%; }
}