/* ---- tokens ---- */
:root {
  --bg: #10141c;
  --panel: #1b212c;
  --panel-2: #222939;
  --line: #2a3140;
  --text: #e7eaee;
  --muted: #8791a3;
  --signal: #e8a33d;
  --signal-dim: #a97a3f;
  --hot: #e5484d;

  --font-display: "Space Grotesk", sans-serif;
  --font-body: "Source Serif 4", serif;
  --font-mono: "IBM Plex Mono", monospace;

  --col-max: 780px;
  --col-wide: 1040px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.65;
}

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

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--text);
}

/* ---- shell layout: left rail + content ---- */
.shell {
  display: grid;
  grid-template-columns: 240px 1fr;
  min-height: 100vh;
}

.rail {
  border-right: 1px solid var(--line);
  padding: 2rem 1.5rem;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.rail__brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
  display: block;
  margin-bottom: 0.15rem;
}

.rail__tagline {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  display: block;
  margin-bottom: 2rem;
}

.rail__label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 1.5rem 0 0.5rem;
}

.rail__nav a, .rail__series a {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text);
  padding: 0.3rem 0;
  border-left: 2px solid transparent;
  padding-left: 0.6rem;
  margin-left: -0.6rem;
}

.rail__nav a:hover, .rail__series a:hover {
  border-left-color: var(--signal);
  text-decoration: none;
  color: var(--signal);
}

.rail__series .count {
  color: var(--muted);
  font-size: 0.75rem;
}

main {
  padding: 3rem 2rem 6rem;
  max-width: var(--col-wide);
}

.prose {
  max-width: var(--col-max);
}

/* ---- encoding strip: the signature element ---- */
.encoding {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--signal-dim);
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

/* ---- post list ---- */
.post-list-item {
  border-bottom: 1px solid var(--line);
  padding: 1.4rem 0;
  max-width: var(--col-max);
}

.post-list-item__top {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.4rem;
}

.post-list-item h2 {
  font-size: 1.3rem;
  margin: 0;
}

.post-list-item__meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.post-list-item p { color: var(--muted); margin: 0; }

/* ---- post header ---- */
.post-header {
  max-width: var(--col-max);
  margin-bottom: 2.5rem;
}

.post-header__top {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.6rem;
}

.post-header h1 { font-size: 2.1rem; margin: 0 0 0.6rem; }

.post-header__meta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--muted);
}

.post-header__meta a { color: var(--muted); }
.post-header__meta a:hover { color: var(--signal); }

/* ---- prose content ---- */
.prose p, .prose ul, .prose ol { margin: 1.1rem 0; }
.prose h2 { font-size: 1.5rem; margin-top: 2.4rem; }
.prose h3 { font-size: 1.2rem; margin-top: 1.8rem; }

.prose blockquote {
  border-left: 2px solid var(--signal);
  margin: 1.5rem 0;
  padding: 0.2rem 1.2rem;
  color: var(--muted);
  font-style: italic;
}

/* code: fenced blocks are allowed to break out wider than prose column */
.prose pre, .prose .highlight {
  max-width: var(--col-wide);
  margin-left: calc((var(--col-max) - var(--col-wide)) / 2);
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel) !important;
}

.prose pre code, .prose code {
  font-family: var(--font-mono);
  font-size: 0.86rem;
}

.prose :not(pre) > code {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
}

/* data tables (perf/PMU output) also break out wide */
.prose table {
  max-width: var(--col-wide);
  margin-left: calc((var(--col-max) - var(--col-wide)) / 2);
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  width: calc(100% + (var(--col-wide) - var(--col-max)));
}

.prose th, .prose td {
  border: 1px solid var(--line);
  padding: 0.5rem 0.75rem;
  text-align: left;
}

.prose th {
  background: var(--panel-2);
  color: var(--muted);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.72rem;
  letter-spacing: 0.05em;
}

.prose tr:nth-child(even) td { background: rgba(255,255,255,0.015); }

/* flag a data cell as a hot/tail-latency outlier: {.hot} in md via raw html span */
.hot { color: var(--hot); font-weight: 600; }

/* diagrams (mermaid) and charts get a panel treatment, always centered, breakout */
.diagram, .chart {
  max-width: var(--col-wide);
  margin: 2rem auto;
  padding: 1.5rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 6px;
}

.diagram svg, .chart img, .chart svg { max-width: 100%; height: auto; }
.chart figcaption {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
  margin-top: 0.75rem;
  text-align: center;
}

/* series index page */
.series-card {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 6px;
  padding: 1.5rem;
  margin-bottom: 1rem;
  max-width: var(--col-max);
}

.series-card h2 { margin: 0 0 0.3rem; font-size: 1.15rem; }
.series-card .count { font-family: var(--font-mono); color: var(--muted); font-size: 0.8rem; }

footer.site-footer {
  max-width: var(--col-max);
  border-top: 1px solid var(--line);
  margin-top: 4rem;
  padding-top: 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
}

/* ---- mobile ---- */
@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; }
  .rail {
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--line);
    padding: 1.25rem 1.5rem;
  }
  main { padding: 2rem 1.25rem 4rem; }
  .prose pre, .prose .highlight, .prose table, .diagram, .chart {
    max-width: 100%;
    margin-left: 0;
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}