:root {
  --bg: #0b0e14;
  --panel: #111722;
  --line: #1e2735;
  --text: #d7dde8;
  --muted: #78859b;
  --bid: #26c281;
  --bid-dim: rgba(38, 194, 129, 0.14);
  --ask: #ef5350;
  --ask-dim: rgba(239, 83, 80, 0.14);
  --accent: #5b8def;
  font-family: "SF Mono", "JetBrains Mono", ui-monospace, "Cascadia Code",
    Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: radial-gradient(1200px 600px at 70% -10%, #16203010, transparent),
    var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

.app {
  max-width: 1080px;
  margin: 0 auto;
  padding: 32px 24px 48px;
}

.masthead {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  flex-wrap: wrap;
}

h1 {
  font-size: 22px;
  font-weight: 600;
  margin: 0 0 6px;
  letter-spacing: -0.01em;
}

h1 .accent {
  color: var(--muted);
  font-weight: 400;
}

.sub {
  margin: 0;
  max-width: 620px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

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

.controls {
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 16px;
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.btn:hover {
  border-color: var(--accent);
}

.segmented {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}

.seg {
  background: var(--panel);
  color: var(--muted);
  border: 0;
  padding: 8px 14px;
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.seg + .seg {
  border-left: 1px solid var(--line);
}

.seg.active {
  background: var(--accent);
  color: #fff;
}

.seg:disabled {
  opacity: 0.6;
  cursor: wait;
}

.speed {
  font-size: 12px;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 8px;
}

.speed input {
  accent-color: var(--accent);
}

.explainer {
  margin: 22px 0 4px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 18px;
}

.explainer p {
  margin: 0 0 12px;
  color: var(--text);
  font-size: 13px;
  line-height: 1.55;
  max-width: 780px;
}

.legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.legend li {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

.legend .tag {
  display: inline-block;
  margin-right: 6px;
  padding: 1px 7px;
  border-radius: 5px;
  background: var(--line);
  color: var(--text);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.legend em {
  color: var(--text);
  font-style: normal;
}

.stats {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 10px;
  margin: 24px 0;
}

.stat {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat .label {
  font-size: 11px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.stat .val {
  font-size: 18px;
  font-variant-numeric: tabular-nums;
}

.val.bid {
  color: var(--bid);
}
.val.ask {
  color: var(--ask);
}

.book {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 16px;
}

.ladder,
.tape {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
}

.colhead {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  font-size: 11px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 4px 8px 8px;
}

.tape .colhead {
  grid-template-columns: 1.4fr 1fr 0.8fr;
}

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

.row {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  padding: 3px 8px;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  border-radius: 4px;
}

.row .depthbar {
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;
  border-radius: 4px;
  z-index: 0;
}

.row span {
  position: relative;
  z-index: 1;
}

.asks .row .price {
  color: var(--ask);
}
.asks .row .depthbar {
  background: var(--ask-dim);
}
.bids .row .price {
  color: var(--bid);
}
.bids .row .depthbar {
  background: var(--bid-dim);
}

.row .size,
.row .depthcol {
  text-align: left;
  color: var(--text);
}

.mid {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 8px;
  margin: 6px 0;
  border-top: 1px dashed var(--line);
  border-bottom: 1px dashed var(--line);
  font-variant-numeric: tabular-nums;
}

#mid-price {
  font-size: 20px;
  font-weight: 600;
}

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

.tape .row {
  grid-template-columns: 1.4fr 1fr 0.8fr;
}

.tape .row.buy .price {
  color: var(--bid);
}
.tape .row.sell .price {
  color: var(--ask);
}
.tape .row .t {
  color: var(--muted);
}

.foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 24px;
  font-size: 12px;
  color: var(--muted);
}

.foot .src {
  color: var(--accent);
  text-decoration: none;
}

.foot .src:hover {
  text-decoration: underline;
}

@media (max-width: 860px) {
  .stats {
    grid-template-columns: repeat(3, 1fr);
  }
  .legend {
    grid-template-columns: 1fr;
  }
  .book {
    grid-template-columns: 1fr;
  }
}