:root {
  --paper: #eef2f6;
  --well: #e3e9f0;
  --ink: #131a24;
  --ink-2: #4a5566;
  --line: #c9d2dd;
  --grid: #dbe2ea;
  --cell: #d6dde6;
  --thread-a: #2346e8;
  --thread-b: #d93d12;
  --thread-ab: #7a2bb8;
  --danger: #b3261e;
  --ok: #1d7a46;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0e131a;
    --well: #151c26;
    --ink: #e6ebf2;
    --ink-2: #9aa6b6;
    --line: #2a3546;
    --grid: #1a2230;
    --cell: #1f2835;
    --thread-a: #6b86ff;
    --thread-b: #ff6a3d;
    --thread-ab: #b77dff;
    --danger: #ff8a80;
    --ok: #5ed39a;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 15px/1.5 var(--sans);
  -webkit-font-smoothing: antialiased;
}

h1, h2, p { margin: 0; }
h2 { font-size: 0.95rem; font-weight: 700; }
code, pre, output, dd, input { font-family: var(--mono); }
var { font-style: normal; font-family: var(--mono); font-size: 0.92em; }

.top {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 32px;
  align-items: end;
  max-width: 1480px;
  margin: 0 auto;
  padding: 40px 32px 28px;
}
.mark {
  font-size: clamp(2.6rem, 5vw, 4.2rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 0.95;
}
.t1 { color: var(--thread-a); }
.t2 { color: var(--thread-b); }
.lede { max-width: 68ch; color: var(--ink-2); text-wrap: pretty; }
.lede var { color: var(--ink); }

.layout {
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr);
  gap: 32px;
  max-width: 1480px;
  margin: 0 auto;
  padding: 0 32px 32px;
}

/* Controls */
.controls { display: flex; flex-direction: column; gap: 28px; min-width: 0; }
form { display: flex; flex-direction: column; gap: 12px; }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
label { display: flex; flex-direction: column; gap: 4px; font-size: 0.8rem; font-weight: 600; color: var(--ink-2); }
input:not([type]), input[inputmode] {
  width: 100%;
  padding: 9px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--paper);
  color: var(--ink);
  font-size: 0.95rem;
}
input:focus-visible, button:focus-visible, pre:focus-visible, .method input:focus-visible + span {
  outline: 2px solid var(--thread-a);
  outline-offset: 2px;
}
input[aria-invalid="true"] { border-color: var(--danger); box-shadow: 0 0 0 1px var(--danger); }

.method { display: grid; grid-template-columns: 1fr 1fr; border: 0; padding: 0; margin: 4px 0 0; gap: 0; }
.method legend { font-size: 0.8rem; font-weight: 600; color: var(--ink-2); padding: 0 0 4px; }
.method label { flex-direction: row; }
.method input { position: absolute; opacity: 0; pointer-events: none; }
.method span {
  flex: 1;
  text-align: center;
  padding: 8px 0;
  border: 1px solid var(--line);
  font: 600 0.85rem var(--mono);
  color: var(--ink-2);
  cursor: pointer;
}
.method label:first-of-type span { border-radius: 6px 0 0 6px; }
.method label:last-of-type span { border-radius: 0 6px 6px 0; border-left: 0; }
.method input:checked + span { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.hint { font-size: 0.8rem; color: var(--ink-2); min-height: 2.4em; }

button { font: inherit; cursor: pointer; }
.run {
  margin-top: 4px;
  padding: 11px 16px;
  border: 0;
  border-radius: 6px;
  background: var(--ink);
  color: var(--paper);
  font-weight: 700;
  transition: transform 160ms cubic-bezier(0.2, 0.8, 0.2, 1), background 160ms;
}
.run:hover { background: var(--thread-a); }
.run:active { transform: translateY(1px); }
.run.busy { background: var(--thread-b); }
.error { color: var(--danger); font-size: 0.85rem; }

.ghost {
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: transparent;
  color: var(--ink);
  font-size: 0.8rem;
}
.ghost:hover { border-color: var(--ink-2); }

.presets { display: flex; flex-wrap: wrap; gap: 6px; margin-top: -12px; }
.presets button {
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--ink-2);
  font-size: 0.8rem;
}
.presets button:hover { color: var(--ink); border-color: var(--ink-2); }

.exchange, .stats { display: flex; flex-direction: column; gap: 8px; }
.exchange-head { display: flex; justify-content: space-between; align-items: center; }
.wire, .raw {
  margin: 0;
  padding: 12px 14px;
  border-radius: 6px;
  background: var(--well);
  font-size: 0.75rem;
  line-height: 1.55;
  overflow: auto;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.wire { max-height: 260px; }
.wire .dim { color: var(--ink-2); }
.wire .m { color: var(--thread-a); font-weight: 700; }
.stats-body { font-size: 0.85rem; color: var(--ink-2); overflow-wrap: anywhere; }
.stats-body b { color: var(--ink); font-family: var(--mono); font-weight: 600; }
.stats .ghost { align-self: flex-start; }

/* Response */
.view { display: flex; flex-direction: column; gap: 20px; min-width: 0; }
.bar { height: 4px; background: var(--grid); border-radius: 2px; overflow: hidden; }
.fill { height: 100%; width: 0; background: var(--ink); }
.fill.done { background: var(--ok); }
.figures {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  margin: 14px 0 0;
}
.figures dt { font-size: 0.75rem; color: var(--ink-2); }
.figures dd { margin: 2px 0 0; font-size: 1.15rem; font-variant-numeric: tabular-nums; white-space: nowrap; }
.status { margin-top: 10px; font-size: 0.85rem; color: var(--ink-2); min-height: 1.5em; }
.status.ok { color: var(--ok); }
.status.bad { color: var(--danger); }

.map { margin: 0; display: flex; flex-direction: column; gap: 12px; }
.frame {
  position: relative;
  display: grid;
  place-items: center;
  min-height: min(62vh, 640px);
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 16px 16px;
  overflow: hidden;
}
canvas {
  display: block;
  image-rendering: pixelated;
  box-shadow: 0 1px 2px rgb(0 0 0 / 0.08), 0 8px 24px -12px rgb(0 0 0 / 0.25);
  cursor: crosshair;
}
.probe {
  position: absolute;
  pointer-events: none;
  padding: 4px 8px;
  border-radius: 4px;
  background: var(--ink);
  color: var(--paper);
  font-size: 0.75rem;
  white-space: nowrap;
  max-width: 320px;
  overflow: hidden;
  text-overflow: ellipsis;
  transform: translate(12px, 12px);
}

.map-bar { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 12px 24px; }
.legend { display: flex; flex-wrap: wrap; gap: 6px 18px; margin: 0; padding: 0; list-style: none; font-size: 0.85rem; }
.legend li { display: flex; align-items: center; gap: 6px; max-width: 18ch; }
.legend span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.legend b { font-family: var(--mono); font-weight: 600; font-variant-numeric: tabular-nums; }
.sw { width: 12px; height: 12px; border-radius: 2px; flex: none; }
.sw.n { background: var(--cell); box-shadow: inset 0 0 0 1px var(--line); }
.sw.a { background: var(--thread-a); }
.sw.b { background: var(--thread-b); }
.sw.ab { background: var(--thread-ab); }

.width { display: flex; align-items: center; gap: 10px; font-size: 0.85rem; }
.width label { flex-direction: row; font-size: 0.85rem; }
.width input { width: 180px; accent-color: var(--thread-a); }
.width-hint { flex-basis: 100%; min-height: 0; }
.width output { min-width: 11ch; font-size: 0.8rem; color: var(--ink-2); }

.head { display: flex; flex-direction: column; gap: 8px; }
.raw { max-height: 7.5em; }
.raw .a { color: var(--thread-a); }
.raw .b { color: var(--thread-b); }
.raw .ab { color: var(--thread-ab); }

.foot { max-width: 1480px; margin: 0 auto; padding: 8px 32px 40px; font-size: 0.8rem; color: var(--ink-2); }

@media (max-width: 960px) {
  .top, .layout { grid-template-columns: minmax(0, 1fr); gap: 20px; }
  .top { padding: 24px 16px 16px; }
  .layout { padding: 0 16px 24px; }
  .view { order: -1; }
  .figures { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .frame { min-height: 44vh; padding: 12px; }
  .width input { width: 120px; }
  .foot { padding: 8px 16px 32px; }
}

@media (prefers-reduced-motion: reduce) {
  .run { transition: none; }
}