/* Nord Color Palette */
:root {
  /* Polar Night */
  --nord0: #2e3440;
  --nord1: #3b4252;
  --nord2: #434c5e;
  --nord3: #4c566a;

  /* Snow Storm */
  --nord4: #d8dee9;
  --nord5: #e5e9f0;
  --nord6: #eceff4;

  /* Frost */
  --nord7:  #8fbcbb;
  --nord8:  #88c0d0;
  --nord9:  #81a1c1;
  --nord10: #5e81ac;

  /* Aurora */
  --nord11: #bf616a; /* red    */
  --nord12: #d08770; /* orange */
  --nord13: #ebcb8b; /* yellow */
  --nord14: #a3be8c; /* green  */
  --nord15: #b48ead; /* purple */
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  width: 100%;
  height: 100%;
  background-color: var(--nord0);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  color: var(--nord4);
  overflow: hidden;
}

/* ── Canvas wrapper ─────────────────────────────────────────── */
#game {
  cursor: none;
  position: absolute;
  top: 0;
  left: 0;
  image-rendering: optimizeSpeed;
  image-rendering: -moz-crisp-edges;
  image-rendering: -o-crisp-edges;
  image-rendering: -webkit-optimize-contrast;
  image-rendering: optimize-contrast;
  -ms-interpolation-mode: nearest-neighbor;
  image-rendering: pixelated;
}

/* ── Title overlay (top-left) ───────────────────────────────── */
#title-overlay {
  position: absolute;
  top: 28px;
  left: 36px;
  z-index: 10;
  pointer-events: none;
  user-select: none;
}

#title-overlay h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--nord6);
  text-shadow:
    0 1px 6px rgba(46, 52, 64, 0.7),
    0 0  20px rgba(136, 192, 208, 0.25);
  line-height: 1.1;
}

#title-overlay .subtitle {
  margin-top: 4px;
  font-size: 0.78rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--nord8);
  text-shadow: 0 1px 4px rgba(46, 52, 64, 0.6);
}

/* ── Digit counter badge (top-right) ───────────────────────── */
#pi-badge {
  position: absolute;
  top: 28px;
  right: 36px;
  z-index: 10;
  pointer-events: none;
  user-select: none;
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(46, 52, 64, 0.55);
  border: 1px solid var(--nord3);
  border-radius: 8px;
  padding: 6px 14px;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

#pi-badge .pi-symbol {
  font-size: 1.15rem;
  color: var(--nord13);
  font-weight: 700;
  line-height: 1;
}

#pi-badge .pi-label {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--nord4);
  line-height: 1;
}

/* ── Footer bar ─────────────────────────────────────────────── */
#footer-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  z-index: 10;
  pointer-events: none;
  user-select: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 36px;
  background: linear-gradient(
    to top,
    rgba(46, 52, 64, 0.72) 0%,
    transparent 100%
  );
}

#footer-bar .footer-left {
  display: flex;
  align-items: center;
  gap: 18px;
}

#footer-bar .legend-dot {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--nord4);
  opacity: 0.8;
}

#footer-bar .legend-dot::before {
  content: '';
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

#footer-bar .dot-density::before  { background: var(--nord9);  }
#footer-bar .dot-velocity::before { background: var(--nord14); }
#footer-bar .dot-layer::before    { background: var(--nord15); }

#footer-bar .footer-right {
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--nord3);
}

/* ── Decorative top accent line ─────────────────────────────── */
#top-accent {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  z-index: 20;
  background: linear-gradient(
    to right,
    var(--nord10),
    var(--nord9),
    var(--nord8),
    var(--nord7),
    var(--nord10)
  );
  pointer-events: none;
}