:root {
  --bg: #0b0e14;
  --fg: #c9d1d9;
  --accent: #58a6ff;
  --warn: #f0883e;
  --ok: #56d364;
  --err: #f85149;
  --muted: #5a6472;
  --panel: #11151f;
  --border: #1c2230;
  --keypad: #161b27;
  --keypad-hover: #1f2738;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font:
    14px/1.5 ui-monospace,
    SFMono-Regular,
    Menlo,
    monospace;
}

header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}

h1 {
  margin: 0 0 4px;
  font-size: 18px;
  color: var(--accent);
}

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

.wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  padding: 16px 20px;
  align-items: flex-start;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
}

.panel h2 {
  margin: 0 0 8px;
  font-size: 13px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

label {
  display: block;
  margin: 8px 0 2px;
  color: var(--muted);
}

input[type='number'],
input[type='text'],
select {
  background: #0b0e14;
  color: var(--fg);
  border: 1px solid #2a3140;
  border-radius: 5px;
  padding: 5px 7px;
  font: inherit;
  box-sizing: border-box;
}

input[type='number'] {
  width: 90px;
}

input[type='text'] {
  width: 120px;
}

button {
  background: var(--accent);
  color: #04121f;
  border: 0;
  border-radius: 5px;
  padding: 6px 11px;
  cursor: pointer;
  font: inherit;
  font-weight: 600;
  margin-top: 8px;
}

button.ghost {
  background: transparent;
  color: var(--accent);
  border: 1px solid #2a3140;
  font-weight: 400;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ---- calculator display ---- */
.display {
  background: #060810;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 14px 16px;
  margin-bottom: 14px;
}

.display .disp-label {
  color: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.display .disp-value {
  font-size: 22px;
  color: var(--ok);
  word-break: break-all;
  min-height: 28px;
  margin-top: 2px;
}

.display .disp-sub {
  color: var(--muted);
  font-size: 12px;
  margin-top: 4px;
  min-height: 16px;
}

/* ---- keypad ---- */
.keypad {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  margin-top: 10px;
}

.keypad button {
  margin-top: 0;
  background: var(--keypad);
  color: var(--fg);
  border: 1px solid var(--border);
  font-weight: 500;
  padding: 12px 0;
  font-size: 16px;
}

.keypad button:hover {
  background: var(--keypad-hover);
}

.keypad button.op {
  color: var(--accent);
}

.keypad button.wide {
  grid-column: span 2;
}

.keypad button.act {
  background: var(--accent);
  color: #04121f;
  font-weight: 600;
}

.keypad button.danger {
  color: var(--err);
}

.row {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  align-items: flex-end;
}

.col {
  display: flex;
  flex-direction: column;
}

.controls {
  flex: 1 1 360px;
  min-width: 320px;
}

.side {
  flex: 1 1 320px;
  min-width: 300px;
}

#vars {
  white-space: pre-wrap;
  max-height: 260px;
  overflow: auto;
  font-size: 13px;
}

.reg-item {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  padding: 4px 6px;
  border-radius: 5px;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
}

.reg-item:hover {
  background: var(--keypad-hover);
}

.reg-item .reg-val {
  color: var(--fg);
  opacity: 0.8;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 60%;
}

.reg-item .reg-drop {
  color: var(--err);
  opacity: 0;
  font-weight: 700;
  padding: 0 4px;
}

.reg-item:hover .reg-drop {
  opacity: 0.8;
}

#out {
  white-space: pre-wrap;
  max-height: 360px;
  overflow: auto;
  font-size: 13px;
}

.log-line {
  border-bottom: 1px solid var(--border);
  padding: 4px 0;
}

.log-cmd {
  color: var(--accent);
}

.log-err {
  color: var(--err);
}

.log-pending {
  color: var(--warn);
}

.reg {
  color: var(--ok);
}

.store {
  width: 90px;
}

fieldset {
  border: 1px solid var(--border);
  border-radius: 6px;
  margin: 0 0 10px;
  padding: 8px 10px;
}

legend {
  color: var(--muted);
  padding: 0 4px;
  font-size: 12px;
}

.console-row {
  display: flex;
  gap: 6px;
  margin-top: 10px;
}

#console {
  flex: 1;
}

code {
  color: var(--accent);
}

.pill {
  display: inline-block;
  background: #0b0e14;
  border: 1px solid #2a3140;
  border-radius: 12px;
  padding: 1px 9px;
  color: var(--accent);
}

/* clickable target hint */
.target-active {
  outline: 2px solid var(--accent);
}

.hint {
  color: var(--muted);
  font-size: 11px;
  margin: 2px 0 0;
}