:root {
  --bg: #ffffff;
  --ink: #161616;
  --muted: #6f6f6f;
  --rule: #e0e0e0;
  --faint: #f2f2f2;
  --date: #d02670;

  --measure: 36rem;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --math: KaTeX_Main, "Times New Roman", serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #161616;
    --ink: #f4f4f4;
    --muted: #a8a8a8;
    --rule: #393939;
    --faint: #262626;
    --date: #ff7eb6;
  }
}
:root[data-theme="dark"] {
  --bg: #161616;
  --ink: #f4f4f4;
  --muted: #a8a8a8;
  --rule: #393939;
  --faint: #262626;
  --date: #ff7eb6;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

/* ---------- header ---------- */

.site-header,
main,
.site-footer {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 1rem;
}

.site-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding-top: 2.5rem;
}

.wordmark {
  margin: 0;
  font-family: var(--math);
  font-weight: 400;
  font-size: 2rem;
  line-height: 1;
  letter-spacing: 0.01em;
}
.wordmark a { text-decoration: none; }

.site-header nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9375rem;
}
.site-header nav a:hover { color: var(--ink); }

.lede {
  margin: 0.75rem 0 0;
  color: var(--muted);
}

/* ---------- sphere ---------- */

.sphere {
  margin: 1.5rem 0 0;
  text-align: center;
}
#qlock {
  display: flex;
  justify-content: center;
  touch-action: none;
  cursor: grab;
}
#qlock:active { cursor: grabbing; }
#qlock canvas { display: block; }

.sphere figcaption {
  margin-top: 0.25rem;
  font-size: 0.8125rem;
  color: var(--muted);
}

/* ---------- readout ---------- */

.readout {
  margin: 2.5rem 0 0;
  border-top: 1px solid var(--rule);
}
.readout .row {
  display: grid;
  grid-template-columns: 5.5rem 1fr auto;
  align-items: baseline;
  gap: 0 1rem;
  padding: 0.875rem 0;
  border-bottom: 1px solid var(--rule);
}
.readout dt {
  color: var(--muted);
  font-size: 0.9375rem;
}
.readout dd { margin: 0; }

.swatch {
  display: inline-block;
  width: 0.875rem;
  height: 2px;
  margin-right: 0.5rem;
  background: var(--ink);
  vertical-align: 0.3em;
}
.row.date .swatch { background: var(--date); }

.readout .value {
  font-size: 1.375rem;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}
.readout .angles {
  color: var(--muted);
  font-size: 0.875rem;
  text-align: right;
  white-space: nowrap;
}
.readout .angles .katex { font-size: 1.05em; color: var(--ink); }

/* ---------- state ---------- */

h2 {
  margin: 0;
  font-size: 1rem;
  font-weight: 500;
}

.state { margin-top: 2.5rem; }
.state h2 { font-weight: 400; font-size: 1.125rem; }
.state h2 .katex { font-size: 1.1em; }

.math {
  margin-top: 0.75rem;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.25rem 0;
}
.math .katex { font-size: 1.15rem; }
.math .katex-display { margin: 0; text-align: left; }
.math .katex-display > .katex { text-align: left; }

.date-ket { color: var(--date); }

/* ---------- gates ---------- */

.gates { margin-top: 3rem; }

.tabs {
  display: flex;
  gap: 1.5rem;
  margin-top: 0.75rem;
  border-bottom: 1px solid var(--rule);
}
.tabs button {
  appearance: none;
  background: none;
  border: 0;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  padding: 0.5rem 0;
  font: inherit;
  font-size: 0.9375rem;
  color: var(--muted);
  cursor: pointer;
}
.tabs button:hover { color: var(--ink); }
.tabs button[aria-selected="true"] {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.circuit-wrap {
  margin-top: 1.25rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
#circuit {
  display: block;
  font-family: var(--sans);
}
#circuit .wire { stroke: var(--ink); stroke-width: 1; }
#circuit .wire.date { stroke: var(--date); }
#circuit .gate rect { fill: var(--bg); stroke: var(--ink); stroke-width: 1.25; }
#circuit .gate.date rect { stroke: var(--date); }
#circuit .gate text { fill: var(--ink); font-size: 13px; }
#circuit .ket { fill: var(--ink); font-family: var(--math); font-size: 16px; }
#circuit .label { fill: var(--muted); font-size: 13px; }
#circuit .label.name { fill: var(--ink); }
#circuit .label.name.date { fill: var(--date); }

.circuit-note {
  margin: 0.75rem 0 0;
  font-size: 0.875rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.circuit-note .time { color: var(--ink); }
.circuit-note .date { color: var(--date); }

.caption {
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 0.875rem;
  max-width: 34rem;
}
.caption .katex { color: var(--ink); }

/* ---------- footer ---------- */

.site-footer {
  margin-top: 4rem;
  padding-bottom: 2.5rem;
  color: var(--muted);
  font-size: 0.8125rem;
}
.site-footer p { margin: 0; padding-top: 1rem; border-top: 1px solid var(--rule); }

/* ---------- about page ---------- */

.prose { margin-top: 2rem; }
.prose h2 { margin-top: 2rem; }
.prose p { margin: 0.75rem 0 0; }
.prose .katex { font-size: 1.05em; }

@media (max-width: 480px) {
  .site-header { padding-top: 1.5rem; }
  .readout .row { grid-template-columns: 4.5rem 1fr; }
  .readout .angles { grid-column: 2; text-align: left; margin-top: 0.125rem; }
  .tabs { gap: 1.125rem; }
}