:root {
  --bg: #0f1317;
  --panel: #161c23;
  --panel-edge: #232c36;
  --text: #cdd7e1;
  --muted: #8b97a4;
  --green: #4caf7d;
  --green-dim: #2c4f3d;
  --red: #e05555;
  --red-dim: #55302f;
  --you: #e8b34b;
  --you-dim: #4a3a17;
  --fair: #7f9bd1;
  --episode: rgba(224, 85, 85, 0.10);
  --bar-alpha: 0.28;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color-scheme: dark;
  font-size: 15px;
}

/* A light theme for people reading on a phone in daylight, or who just
   find dark screens hard on the eyes. Same accents, deepened for paper. */
:root[data-theme="light"] {
  --bg: #f3f5f7;
  --panel: #ffffff;
  --panel-edge: #d9e0e7;
  --text: #1d2530;
  --muted: #5b6874;
  --green: #1e7a4f;
  --green-dim: #bfe3cf;
  --red: #b23a3a;
  --red-dim: #f0cfcf;
  --you: #9c6a1a;
  --you-dim: #f6e6c4;
  --fair: #3b64b3;
  --episode: rgba(178, 58, 58, 0.10);
  --bar-alpha: 0.7;
  color-scheme: light;
}

/* Blue for bids, orange for asks: the usual fix for red/green colorblindness,
   which is common enough that real trading platforms ship this toggle. */
:root[data-palette="cb"] {
  --green: #5b9be0;
  --green-dim: #2b4a6b;
  --red: #e6923d;
  --red-dim: #5a3d22;
  --episode: rgba(230, 146, 61, 0.12);
}
:root[data-theme="light"][data-palette="cb"] {
  --green: #2b6cb0;
  --green-dim: #c9dcf2;
  --red: #a8500e;
  --red-dim: #f3d9c2;
}

* { box-sizing: border-box; }

body {
  margin: 0 auto;
  padding: 18px 20px 36px;
  max-width: 1280px;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.5;
}

/* Numbers and the tape stay monospace; everything meant to be read as
   prose is a normal sans. */
#ladder, #tape, #desks, .user-stats, #quote-line, #perf, #bot-code,
table.desks, input[type="number"], .badge, .mono {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}

header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

h1 {
  margin: 0;
  font-family: var(--mono);
  font-size: 1.9rem;
  letter-spacing: 0.04em;
}

.tagline { margin: 4px 0 0; color: var(--muted); max-width: 44rem; }

.controls {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.controls label, .bot-controls label, .entry label { color: var(--muted); }
.controls .source { color: var(--fair); text-decoration: none; padding: 5px 6px; }
.controls .source:hover { text-decoration: underline; }

input, select, button, textarea {
  font: inherit;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: 6px;
  padding: 5px 10px;
}

input[type="number"] { width: 6em; }

button { cursor: pointer; transition: border-color 0.12s, background 0.12s; }
button:hover { border-color: var(--muted); }
button.buy { color: var(--green); border-color: var(--green-dim); }
button.sell { color: var(--red); border-color: var(--red-dim); }
button.buy:hover { background: var(--green-dim); }
button.sell:hover { background: var(--red-dim); }
button.primary { color: var(--you); border-color: var(--you); }
button.primary:hover { background: var(--you-dim); }
button:disabled { opacity: 0.45; cursor: default; }
button:disabled:hover { border-color: var(--panel-edge); background: var(--panel); }
#flatten { color: var(--you); }

/* The little question marks on every panel. */
button.help {
  width: 20px;
  height: 20px;
  padding: 0;
  border-radius: 50%;
  font-family: var(--mono);
  font-size: 0.8rem;
  line-height: 1;
  color: var(--muted);
  text-transform: none;
  letter-spacing: 0;
  vertical-align: middle;
}
button.help:hover { color: var(--you); border-color: var(--you); }

/* Keyboard users get a ring they can actually see. */
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--you);
  outline-offset: 2px;
}

/* Fingers are wider than mouse pointers. */
@media (pointer: coarse) {
  #ladder .cell { min-height: 2em; padding-top: 4px; }
  button { padding: 9px 13px; }
}

@media (prefers-reduced-motion: reduce) {
  .toast, #tip { transition: none; }
}

main {
  display: grid;
  grid-template-columns: 244px minmax(0, 1fr) 300px;
  gap: 12px;
  align-items: start;
}

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

.panel h2 {
  margin: 0 0 10px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.panel h2 > span:first-child { display: inline-flex; align-items: center; gap: 8px; flex-wrap: wrap; }

.hint { font-weight: 400; text-transform: none; letter-spacing: 0; font-size: 0.85rem; }

.center-panel, .side-panel {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

/* settings */

.settings { margin-bottom: 14px; }
.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 10px 22px;
}
.setting {
  display: grid;
  grid-template-columns: 7.5em auto;
  gap: 2px 10px;
  align-items: center;
}
.setting label, .setting .label { color: var(--text); font-weight: 500; }
.setting select, .setting button { justify-self: start; }
.setting p { grid-column: 1 / -1; margin: 0 0 4px; color: var(--muted); font-size: 0.9rem; }

/* ladder */

#ladder { display: grid; grid-template-columns: 1fr auto 1fr; }

#ladder .cell {
  padding: 1px 6px;
  position: relative;
  text-align: right;
  min-height: 1.45em;
  border-radius: 3px;
}

#ladder .price { color: var(--muted); text-align: center; min-width: 4.5em; }
#ladder .price.touch { color: var(--text); font-weight: 600; }

#ladder .bid, #ladder .ask { cursor: pointer; }
#ladder .bid:hover { outline: 1px solid var(--green); }
#ladder .ask:hover { outline: 1px solid var(--red); }
#ladder .bid { color: var(--green); }
#ladder .ask { color: var(--red); text-align: left; }

#ladder .bar {
  position: absolute;
  top: 1px; bottom: 1px;
  z-index: 0;
  opacity: var(--bar-alpha);
}
#ladder .bid .bar { right: 0; background: var(--green-dim); }
#ladder .ask .bar { left: 0; background: var(--red-dim); }
#ladder .cell span { position: relative; z-index: 1; }

#ladder .mine {
  color: var(--you);
  font-size: 0.85em;
  margin-right: 4px;
}
#ladder .ask .mine { margin: 0 0 0 4px; }

#depth {
  width: 100%;
  height: 84px;
  display: block;
  margin-top: 10px;
}

/* chart */

.chart-panel canvas {
  width: 100%;
  height: 260px;
  display: block;
}
.chart-panel canvas[hidden] { display: none; }

h2 button.mini {
  font-size: 0.78rem;
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  padding: 1px 8px;
}

.legend { font-weight: 400; text-transform: none; letter-spacing: 0; display: flex; gap: 10px; align-items: center; font-size: 0.85rem; }
.swatch { display: inline-block; width: 14px; height: 3px; margin-right: 4px; vertical-align: middle; }
.swatch.mid { background: var(--text); }
.swatch.fair { background: var(--fair); }
.swatch.episode { background: var(--episode); height: 10px; border: 1px solid var(--red-dim); }

/* desks */

#desks { width: 100%; border-collapse: collapse; }
#desks th, #desks td { padding: 4px 8px; text-align: right; }
#desks th:first-child, #desks td:first-child { text-align: left; }
#desks th { color: var(--muted); font-weight: 400; border-bottom: 1px solid var(--panel-edge); font-family: var(--sans); }
#desks td:first-child { cursor: help; text-decoration: underline dotted var(--panel-edge); text-underline-offset: 3px; }
#desks .pos { color: var(--muted); }
#desks .up { color: var(--green); }
#desks .down { color: var(--red); }
#desks .you-row td:first-child { color: var(--you); }
#desks .bot-row td:first-child { color: var(--fair); }

.badge {
  font-size: 0.75rem;
  padding: 0 7px;
  border-radius: 8px;
  border: 1px solid var(--panel-edge);
  color: var(--muted);
}
.badge.hot { color: var(--red); border-color: var(--red-dim); }

#quote-line {
  color: var(--muted);
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  font-size: 0.85rem;
}

#desks td.spark { padding: 4px 4px 0; }
#desks th.spark { text-align: center; }
#desks .spark canvas {
  display: block;
  margin-left: auto;
  width: 56px;
  height: 16px;
}

@media (max-width: 480px) {
  #desks .spark { display: none; }
}

/* user panel */

.user-stats { display: flex; gap: 16px; margin-bottom: 10px; flex-wrap: wrap; }
.user-stats div { display: flex; flex-direction: column; }
.user-stats .k { color: var(--muted); font-size: 0.75rem; font-family: var(--sans); }
.user-stats .up { color: var(--green); }
.user-stats .down { color: var(--red); }

.entry { display: flex; gap: 6px; align-items: center; margin-bottom: 8px; flex-wrap: wrap; }

.orders { display: flex; flex-direction: column; gap: 3px; font-family: var(--mono); }
.orders .empty { color: var(--muted); font-family: var(--sans); font-size: 0.85rem; }
.order-row { display: flex; justify-content: space-between; gap: 6px; align-items: center; }
.order-row button {
  padding: 0 6px;
  border: none;
  background: none;
  color: var(--muted);
}
.order-row button:hover { color: var(--red); }

/* tape */

#tape {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 300px;
  overflow: hidden;
}
#tape li { display: flex; justify-content: space-between; }
.you-tag { color: var(--you); }
#tape .bot-tag { color: var(--fair); }

/* tooltips and toasts */

#tip {
  position: fixed;
  z-index: 30;
  max-width: 300px;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--panel-edge);
  border-left: 3px solid var(--you);
  border-radius: 6px;
  padding: 8px 11px;
  font-size: 0.88rem;
  line-height: 1.45;
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.45);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.1s;
}
#tip.show { opacity: 1; }

.notice { margin: 20px 0; color: var(--muted); }

#toasts {
  position: fixed;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  z-index: 10;
  pointer-events: none;
  max-width: min(92vw, 34rem);
}

.toast {
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-left: 3px solid var(--you);
  border-radius: 6px;
  padding: 7px 13px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.45);
  opacity: 0;
  transition: opacity 0.25s;
}
.toast.show { opacity: 1; }

/* tour */

#tour-overlay .spot {
  position: fixed;
  z-index: 40;
  border: 2px solid var(--you);
  border-radius: 10px;
  box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.55);
  pointer-events: none;
  transition: left 0.25s, top 0.25s, width 0.25s, height 0.25s;
}
#tour-overlay .card {
  position: fixed;
  z-index: 41;
  width: min(360px, 92vw);
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: 10px;
  padding: 14px 16px;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.5);
}
#tour-overlay .step { color: var(--muted); font-size: 0.78rem; font-family: var(--mono); }
#tour h3 { margin: 2px 0 6px; font-size: 1.05rem; }
#tour p { margin: 0 0 12px; }
#tour-overlay .row { display: flex; gap: 8px; align-items: center; }
#tour-overlay .next { color: var(--you); border-color: var(--you); }
#tour-overlay .skip { margin-left: auto; border: none; background: none; color: var(--muted); }
@media (prefers-reduced-motion: reduce) { #tour-overlay .spot { transition: none; } }

/* bot lab */

.bot-lab { margin-top: 14px; }
.lead { margin: 0 0 10px; color: var(--muted); max-width: 60rem; }
.bot-controls {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 10px;
}
#bot-status.err { color: var(--red); }
#bot-status.ok { color: var(--green); }
#bot-code {
  width: 100%;
  background: var(--bg);
  font-family: var(--mono);
  font-size: 0.9rem;
  padding: 10px 12px;
  line-height: 1.5;
  resize: vertical;
  tab-size: 2;
}

.season { margin-top: 10px; }
.season .err { color: var(--red); }
.season .up { color: var(--green); }
.season table.desks th, .season table.desks td { padding: 3px 10px 3px 0; text-align: right; }
.season table.desks th:first-child, .season table.desks td:first-child { text-align: left; }
.season table.desks th { color: var(--muted); font-weight: 400; font-family: var(--sans); }
.season table.desks .down { color: var(--red); }
.season-curve {
  width: 100%;
  height: 120px;
  display: block;
  margin-top: 8px;
}

.about { margin-top: 14px; color: var(--text); }
.about summary { cursor: pointer; color: var(--muted); font-weight: 500; }
.about p { max-width: 62rem; }
.about a { color: var(--fair); }
.fine { color: var(--muted); font-size: 0.9rem; }

footer { margin-top: 12px; color: var(--muted); font-size: 0.8rem; }

@media (max-width: 1000px) {
  main { grid-template-columns: 1fr 1fr; }
  .center-panel { grid-column: 1 / -1; order: -1; }
}

@media (max-width: 640px) {
  main { grid-template-columns: 1fr; }
  header { align-items: flex-start; }
}