*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; }
body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: system-ui, -apple-system, sans-serif;
  background: #0a0a0a;
  color: #fafafa;
  overflow: hidden;
}

#bg {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
}

#clock-wrap {
  position: relative;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
}

#clock {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.col-group {
  display: flex;
  gap: 0.75rem;
}

.bit-col {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.bit {
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.15);
  background: rgba(255,255,255,0.03);
  transition: background 0.15s, box-shadow 0.15s, border-color 0.15s;
  position: relative;
}

.bit.on {
  border-color: var(--bit-color, #00ffcc);
  background: var(--bit-color, #00ffcc);
  box-shadow: 0 0 10px var(--bit-color, #00ffcc), 0 0 24px var(--bit-color, #00ffcc);
}

.separator {
  width: 3px;
  height: 6rem;
  background: linear-gradient(to bottom, transparent, rgba(255,255,255,0.2), transparent);
  border-radius: 2px;
  align-self: center;
}

#time-text {
  font-size: 1.6rem;
  font-weight: 200;
  letter-spacing: 0.3em;
  color: rgba(255,255,255,0.7);
  font-variant-numeric: tabular-nums;
}

#date-text {
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.3);
}

@media (max-width: 480px) {
  .bit { width: 1rem; height: 1rem; }
  .col-group { gap: 0.5rem; }
  #clock { gap: 0.75rem; }
  #time-text { font-size: 1.1rem; letter-spacing: 0.2em; }
}