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

body {
  background: #1a1a2e;
  color: #eee;
  font-family: 'Courier New', monospace;
  min-height: 100vh;
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  justify-content: center;
  padding: 20px;
  gap: 32px;
}

#main {
  display: flex;
  flex-direction: column;
  align-items: center;
}

#clock {
  font-size: 1.4rem;
  color: #00d4ff;
  letter-spacing: 2px;
  text-shadow: 0 0 8px #00d4ff88;
  text-align: center;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid #00d4ff22;
}

h1 {
  margin-top: 10px;
  font-size: 1.8rem;
  color: #00d4ff;
  letter-spacing: 4px;
  text-shadow: 0 0 10px #00d4ff66;
}

#display {
  font-size: 1.1rem;
  color: #aaa;
  letter-spacing: 1px;
  line-height: 2;
}

#display .label {
  display: inline-block;
  width: 4.5rem;
  text-align: right;
}

#display span { color: #fff; font-size: 1.3rem; }

#right-col {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-self: flex-start;
  position: sticky;
  top: 20px;
  flex-shrink: 0;
  width: 420px;
}

#info-panel {
  background: #0d1b2a;
  border: 1px solid #00d4ff33;
  border-radius: 10px;
  padding: 16px;
}

#info-panel #display {
  margin: 0 0 10px;
  line-height: 2;
}

#bin-display {
  font-size: 0.8rem;
  color: #aaa;
  letter-spacing: 1px;
  text-align: center;
  padding-top: 10px;
  border-top: 1px solid #00d4ff22;
}

.bin-line {
  display: block;
  color: #00d4ff;
  font-size: 0.85rem;
  letter-spacing: 2px;
  margin-top: 4px;
  word-break: break-all;
  line-height: 1.8;
}

#abacus {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 10px;
  margin-top: 16px;
  width: 100%;
  max-width: 640px;
}

.bit-tile {
  background: #0d1b2a;
  border: 1px solid #00d4ff22;
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 10px 6px 8px;
  gap: 6px;
  cursor: pointer;
  transition: border-color 0.2s;
}

.bit-tile:hover { border-color: #00d4ff66; }
.bit-tile.on { border-color: #00d4ff99; background: #0a2a3a; }

.bit-label {
  font-size: 0.7rem;
  color: #555;
  letter-spacing: 0.5px;
}

.bead {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #555, #222);
  border: 2px solid #444;
  transition: background 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.bead.on {
  background: radial-gradient(circle at 35% 35%, #00eeff, #0077aa);
  border-color: #00d4ff;
  box-shadow: 0 0 10px #00d4ffaa;
}

.bit-value {
  font-size: 0.85rem;
  color: #555;
}

.bit-value.on { color: #00d4ff; }

#controls {
  margin-top: 28px;
  display: flex;
  gap: 12px;
}

button {
  padding: 8px 20px;
  background: #0d3b5e;
  color: #00d4ff;
  border: 1px solid #00d4ff55;
  border-radius: 6px;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.9rem;
  transition: background 0.2s;
}

button:hover { background: #1a5a8a; }

button img {
  width: 20px;
  height: 20px;
  vertical-align: middle;
  display: block;
}

#manual-input {
  margin-top: 20px;
  display: flex;
  gap: 10px;
  align-items: center;
}

#bit-config {
  margin-top: 20px;
  display: flex;
  gap: 10px;
  align-items: center;
  color: #aaa;
  font-size: 0.9rem;
}

#bit-config input {
  width: 70px;
  padding: 7px 10px;
  background: #0d1b2a;
  border: 1px solid #00d4ff44;
  border-radius: 6px;
  color: #fff;
  font-family: inherit;
  font-size: 1rem;
  text-align: center;
}

#arithmetic {
  margin-top: 20px;
  display: flex;
  gap: 10px;
  align-items: center;
}

#arithmetic button { padding: 8px; }

#arithmetic input, #manual-input input {
  width: 220px;
  flex-shrink: 0;
  padding: 7px 10px;
  background: #0d1b2a;
  border: 1px solid #00d4ff44;
  border-radius: 6px;
  color: #fff;
  font-family: inherit;
  font-size: 1rem;
  text-align: center;
}

#overflow-flag {
  margin-top: 8px;
  font-size: 0.85rem;
  color: #ff4466;
  letter-spacing: 1px;
  min-height: 1.2em;
  text-shadow: 0 0 6px #ff446688;
}

#calendar {
  background: #0d1b2a;
  border: 1px solid #00d4ff33;
  border-radius: 10px;
  padding: 16px;
}

#cal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

#cal-header span {
  color: #00d4ff;
  font-size: 0.95rem;
  letter-spacing: 1px;
}

#cal-header button {
  padding: 4px 10px;
  font-size: 0.85rem;
}

#cal-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
  text-align: center;
}

.cal-day-name {
  font-size: 0.7rem;
  color: #555;
  padding-bottom: 4px;
}

#cal-date {
  text-align: center;
  font-size: 0.85rem;
  color: #aaa;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid #00d4ff22;
}

#cal-date span {
  color: #fff;
  display: block;
  font-size: 1rem;
  margin-top: 4px;
  letter-spacing: 1px;
}

.cal-day {
  font-size: 0.82rem;
  padding: 5px 2px;
  border-radius: 4px;
  cursor: pointer;
  color: #aaa;
}

.cal-day:hover:not(.empty) { background: #00d4ff11; }

.cal-day.today {
  background: #00d4ff22;
  color: #00d4ff;
  border: 1px solid #00d4ff66;
  font-weight: bold;
  text-shadow: 0 0 6px #00d4ff88;
}

.cal-day.selected {
  background: #00d4ff44;
  color: #fff;
  border: 1px solid #00d4ffaa;
}

.cal-day.empty { visibility: hidden; }