/* traxr landing — one light "bulletin" sheet, pixel/8-bit flavor.
   The whole page is a single hairline-framed sheet on warm paper, divided
   by rules. Monospace headings + brand (in line with the pixel logo), sans
   body. Light/pastel; the only saturated color lives in the trace figure. */

:root {
  --paper: #f3f1ec;        /* warm paper behind the sheet */
  --sheet: #fcfbf8;        /* the sheet surface */
  --frame: #1f2937;        /* heavy outer border */
  --rule: #e3e0d8;         /* warm hairline dividers */
  --ink: #20262e;
  --ink-strong: #0f172a;
  --muted: #6b7280;
  --accent: #2563eb;

  --blue-50: #eef4ff;
  --amber-50: #fff6e6;
  --rose-50: #fff4f5;
  --amber: #d97706;

  --code-bg: #f1f0ec;
  --code-ink: #334155;

  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas,
    "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, sans-serif;
}

* { box-sizing: border-box; }

html { overflow-x: hidden; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover, a:focus-visible { text-decoration: underline; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---- the sheet ------------------------------------------------------- */

.sheet {
  max-width: 920px;
  margin: 30px auto;
  background: var(--sheet);
  border: 1px solid var(--frame);
  overflow: hidden;           /* nothing escapes the frame to the right */
}

/* top bar: small logo left, links right */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 24px;
  border-bottom: 1px solid var(--frame);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--ink-strong);
  font-family: var(--mono);
  font-weight: 600;
  font-size: 17px;
}
.brand:hover { text-decoration: none; }
.brand img { display: block; }
.topbar-links { display: flex; gap: 22px; font-family: var(--mono); font-size: 14px; }
.topbar-links a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--muted);
}
.topbar-links a:hover { color: var(--ink-strong); text-decoration: none; }
.topbar-links a:hover span { text-decoration: underline; }
.ico { width: 15px; height: 15px; flex: none; }

/* ---- hero ------------------------------------------------------------ */

.hero { padding: 36px 28px 32px; border-bottom: 1px solid var(--rule); }

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 12px;
}

.hero h1 {
  font-family: var(--mono);
  font-weight: 600;
  font-size: clamp(28px, 4.2vw, 40px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--ink-strong);
  margin: 0 0 18px;
}

.lede {
  font-size: 18px;
  color: var(--ink);
  margin: 0;            /* full content width — no narrow cap */
}
.lede em { font-style: normal; color: var(--ink-strong); font-weight: 600; }

/* the divergence figure — centered under the headline */
.strip { margin: 8px auto 26px; max-width: 600px; }
.strip svg { width: 100%; height: auto; display: block; }
.strip .strip-labels text { font-family: var(--mono); }
.strip figcaption {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 11.5px;
  line-height: 1.5;
  color: var(--muted);
  text-align: center;
}

/* staggered reveal; `both` keeps the final state so dots persist */
.cells rect {
  opacity: 0;
  animation: trace-event 360ms ease-out both;
  animation-delay: calc(var(--i) * 80ms + 250ms);
}
@keyframes trace-event {
  from { opacity: 0; transform: translateY(-3px); }
  to   { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  .cells rect { animation: none; opacity: 1; }
}

.install {
  display: flex;
  align-items: stretch;
  max-width: 100%;
  background: var(--sheet);
  border: 1px solid var(--ink-strong);
  box-shadow: 3px 3px 0 var(--blue-50);   /* the one pixel-shadow */
}
.install code {
  flex: 1;
  min-width: 0;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink-strong);
  background: none;
  padding: 13px 15px;
  overflow-x: auto;
  white-space: pre;
}
.copy-btn {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  padding: 0;
  border: none;
  border-left: 1px solid var(--rule);
  background: none;
  color: var(--muted);
  cursor: pointer;
}
.copy-btn:hover { color: var(--ink-strong); background: var(--blue-50); }
.copy-btn svg { width: 16px; height: 16px; }
.copy-btn .ico-check { display: none; }
.copy-btn.copied { color: #15803d; }
.copy-btn.copied .ico-copy { display: none; }
.copy-btn.copied .ico-check { display: block; }

/* ---- section index --------------------------------------------------- */

.jump {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 20px;
  padding: 11px 24px;
  border-bottom: 1px solid var(--frame);
  font-family: var(--mono);
  font-size: 13px;
}
.jump-label {
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 11px;
  color: var(--muted);
}
.jump a { color: var(--ink); }
.jump a:hover { color: var(--accent); }

/* ---- content sections ------------------------------------------------ */

main > section,
.cols-2 > section { padding: 28px; min-width: 0; }
main > section { border-bottom: 1px solid var(--rule); }

main > section .eyebrow { color: var(--accent); }

h2 {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 23px;
  letter-spacing: -0.01em;
  color: var(--ink-strong);
  margin: 0 0 14px;
}

p { margin: 0 0 14px; }
section p:last-child { margin-bottom: 0; }
.aside { color: var(--muted); font-size: 14.5px; }

/* section title + action button on one row (title left, button right) */
.head-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px 20px;
  margin: 0 0 14px;
}
.head-row h2 { margin: 0; }

/* "Try in Colab" — a flat pixel button that presses on hover (8-bit feel);
   Colab orange ties into the amber t* already in the palette */
.colab-btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  flex: none;
  padding: 9px 15px;
  font-family: var(--mono);
  font-size: 13.5px;
  font-weight: 600;
  color: var(--ink-strong);
  background: var(--sheet);
  border: 1px solid var(--ink-strong);
  box-shadow: 3px 3px 0 var(--amber-50);
  transition: transform 0.08s ease, box-shadow 0.08s ease, background 0.08s ease;
}
.colab-btn:hover {
  text-decoration: none;
  background: var(--amber-50);
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0 var(--amber-50);
}
.colab-btn:active {
  transform: translate(3px, 3px);
  box-shadow: 0 0 0 var(--amber-50);
}
.ico-colab { width: 18px; height: 18px; flex: none; }

code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--blue-50);
  color: var(--accent);
  padding: 1px 5px;
}

/* light, flat code blocks */
pre {
  background: var(--code-bg);
  color: var(--code-ink);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
  padding: 18px 20px;
  overflow-x: auto;
  margin: 18px 0;
  max-width: 100%;
  border: 1px solid var(--rule);
}
pre code { background: none; padding: 0; font-size: inherit; color: inherit; }
pre .c { color: #94a3b8; }
pre .k { color: #2563eb; }
pre .s { color: #15803d; }
pre .f { color: #9333ea; }

/* how it works — three rule-separated columns */
.steps {
  list-style: none;
  counter-reset: step;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--rule);
}
.steps li {
  counter-increment: step;
  min-width: 0;
  padding: 20px 20px 2px;
  border-left: 1px solid var(--rule);
}
.steps li:first-child { border-left: none; padding-left: 2px; }
.steps li:last-child { padding-right: 2px; }
.steps h3 {
  font-family: var(--mono);
  font-size: 15px;
  margin: 0 0 8px;
  color: var(--ink-strong);
}
.steps h3::before {
  content: counter(step);
  font-family: var(--mono);
  font-size: 11px;
  color: #fff;
  background: var(--ink-strong);
  display: inline-block;
  width: 21px;
  height: 21px;
  line-height: 21px;
  text-align: center;
  margin-right: 9px;
  vertical-align: 2px;
}
.steps p { font-size: 14px; color: var(--muted); margin: 0; }

/* metrics — hairline-divided rows */
.metrics { margin: 20px 0 0; }
.metrics div {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 18px;
  align-items: baseline;
  padding: 14px 0;
  border-top: 1px solid var(--rule);
}
.metrics div:first-child { border-top: none; }
.metrics dt {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 14px;
  color: var(--accent);
}
.metrics dd { margin: 0; color: var(--ink); font-size: 14.5px; }

/* operators table */
.table-wrap { overflow-x: auto; margin-top: 16px; }
table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
th {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-align: left;
  color: var(--muted);
  font-weight: 600;
  padding: 8px 14px 8px 0;
  border-bottom: 2px solid var(--frame);
}
td {
  padding: 11px 14px 11px 0;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}
tr:last-child td { border-bottom: none; }
td:nth-child(2) { font-family: var(--mono); font-size: 12px; color: var(--muted); }
td:first-child, td:last-child { white-space: nowrap; }

/* the two notices — side by side, subtle pastel washes */
.cols-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-bottom: 1px solid var(--rule);
}
/* flat notices — no fill (colored links/code read badly on a wash);
   the column rule plus the eyebrow color distinguishes them */
.callout.security { border-left: 1px solid var(--rule); }
.callout.security .eyebrow { color: #be123c; }
.callout.security .eyebrow::before { background: #e11d48; }

/* footer / colophon */
footer { padding: 22px 28px 26px; }
.cite { font-size: 14px; color: var(--muted); margin: 0 0 8px; }
.colophon {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  color: var(--muted);
  margin: 0;
}
.colophon a { color: var(--muted); }
.colophon a:hover { color: var(--ink-strong); }

/* ---- responsive ------------------------------------------------------ */

@media (max-width: 720px) {
  .sheet { margin: 14px; }
  .cols-2 { grid-template-columns: 1fr; }
  .callout.security { border-left: none; border-top: 1px solid var(--rule); }
}

@media (max-width: 540px) {
  body { font-size: 16px; }
  .hero, main > section, .cols-2 > section { padding: 22px 18px; }
  .steps { grid-template-columns: 1fr; border-top: none; }
  .steps li, .steps li:first-child {
    border-left: none;
    border-top: 1px solid var(--rule);
    padding: 16px 0 2px;
  }
  .steps li:first-child { border-top: none; }
  .metrics div { grid-template-columns: 1fr; gap: 3px; }
  td:first-child, td:last-child { white-space: normal; }
}