/* Graphite Instrument base and site chrome. */
* { box-sizing: border-box; }
html { min-width: 0; -webkit-text-size-adjust: 100%; }
body {
  min-width: 0;
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 var(--sans);
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(circle at 82% 0, color-mix(in srgb, var(--accent) 9%, transparent), transparent 30rem),
    repeating-linear-gradient(90deg, transparent 0 79px, color-mix(in srgb, var(--ink) 2%, transparent) 80px);
}
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent-hot); outline-offset: 2px; border-radius: 2px; }
button, input, select { font: inherit; }
code, .num, td[data-num] { font-family: var(--mono); font-size: 0.95em; font-variant-numeric: tabular-nums; }
pre { max-width: 100%; overflow-x: auto; }
.sr-only {
  position: absolute; width: 1px; height: 1px; margin: -1px;
  padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 20;
  background: var(--surface); color: var(--accent);
  padding: 0.5rem 0.9rem; border: 1px solid var(--line-strong); border-radius: var(--r);
}
.skip-link:focus { left: 0.5rem; top: 0.5rem; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 1.25rem; }
.copy { max-width: var(--copy); }

/* ---------- instrument chrome ---------- */
.sg-top {
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 94%, transparent);
}
.sg-top .wrap {
  min-height: 4.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  position: relative;
}
.sg-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--ink);
  text-decoration: none;
  font: 800 0.86rem/1 var(--mono);
  letter-spacing: 0.11em;
}
.sg-mark {
  width: 2rem;
  height: 2rem;
  display: grid;
  place-items: center;
  position: relative;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-size: 0.62rem;
  letter-spacing: 0;
}
.sg-mark::after {
  content: "";
  position: absolute;
  left: 0.35rem;
  right: 0.35rem;
  top: 50%;
  height: 1px;
  background: var(--accent);
  transform: rotate(-28deg);
}
.sg-brand:hover { color: var(--accent); }
.sg-tag {
  color: var(--muted);
  font: 0.72rem/1 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.sg-calibration {
  flex: 1;
  align-self: stretch;
  min-width: 3rem;
  opacity: 0.55;
  background: repeating-linear-gradient(90deg, transparent 0 15px, var(--line-strong) 16px, transparent 17px) bottom right / min(18rem, 100%) 0.35rem no-repeat;
}

.sg-nav {
  border-bottom: 1px solid var(--line);
  background: var(--surface-inset);
}
.sg-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}
.sg-nav a, .sg-nav .soon {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  min-height: 2.5rem;
  padding: 0.45rem 0.75rem;
  border-right: 1px solid var(--line);
  font: 700 0.68rem/1 var(--mono);
  letter-spacing: 0.07em;
  text-decoration: none;
  text-transform: uppercase;
  white-space: nowrap;
}
.sg-nav b { color: var(--accent); font-size: 0.58rem; }
.sg-nav a { color: var(--ink); border-bottom: 2px solid transparent; }
.sg-nav a:hover { color: var(--accent); }
.sg-nav a[aria-current="page"] { color: var(--accent); border-bottom-color: var(--accent); }
.sg-nav .soon { color: var(--muted); cursor: default; position: relative; }
.sg-nav .soon::after {
  content: "soon";
  margin-left: 0.2rem;
  color: var(--muted);
  border: 1px solid var(--line-strong);
  border-radius: var(--r);
  padding: 0.12rem 0.3rem;
  font-size: 0.52rem;
  letter-spacing: 0.08em;
}

/* ---------- main ---------- */
main { padding: 2.4rem 0 4.5rem; }
h1 { margin: 0 0 0.6rem; font-size: clamp(2.2rem, 5vw, 4.7rem); line-height: 0.98; letter-spacing: -0.055em; }
h2 { margin: 2rem 0 0.5rem; font-size: clamp(1.45rem, 3vw, 2.2rem); line-height: 1.12; letter-spacing: -0.03em; }
h3 { line-height: 1.2; }
.eyebrow {
  margin: 0 0 0.55rem;
  color: var(--accent);
  font: 750 0.66rem/1.3 var(--mono);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}
.dek { max-width: var(--copy); margin: 0 0 1.8rem; color: var(--muted); font-size: 1.02rem; }

.panel {
  min-width: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 1.1rem 1.25rem;
}
.panel + .panel { margin-top: var(--gap); }
.panel > :first-child { margin-top: 0; }
.prose-panel h2 { font-size: 1.25rem; }

/* ---------- long-form guides ---------- */
.guide { max-width: var(--copy); }
.guide-header { margin-bottom: 2rem; padding-bottom: 1.2rem; border-bottom: 1px solid var(--line); }
.guide-header h1 { max-width: 13ch; }
.guide-prose { font-size: 1.02rem; }
.guide-prose > p,
.guide-prose > ol,
.guide-prose > ul { max-width: 72ch; }
.guide-prose h2 { margin-top: 2.6rem; }
.guide-prose li + li { margin-top: 0.55rem; }
.guide-tool-link {
  display: inline-block;
  margin: 0.35rem 0 0.75rem;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--accent);
  border-radius: var(--r);
  background: color-mix(in srgb, var(--accent) 8%, var(--surface));
  font: 750 0.72rem/1.35 var(--mono);
  letter-spacing: 0.04em;
  text-decoration: none;
  text-transform: uppercase;
}
.guide-sources {
  margin-top: 3rem;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line-strong);
  color: var(--muted);
  font-size: 0.84rem;
}
.guide-sources h2 { margin-top: 0; font: 750 0.72rem/1.3 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; }
.guide-hub-intro { margin-bottom: 2rem; }
.guides-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--gap); }
.guides-grid .panel + .panel { margin-top: 0; }
.guide-card > span { color: var(--accent); font: 700 0.62rem/1.3 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; }
.guide-card h2 { margin: 0.8rem 0 0.6rem; font-size: clamp(1.3rem, 2.5vw, 1.8rem); }
.guide-card p { margin-bottom: 0; color: var(--muted); }

/* ---------- data tables (Value Lab) ---------- */
.note { color: var(--muted); font-size: 0.82rem; }
.table-wrap { max-width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }
.results-table {
  width: 100%;
  min-width: 0;
  margin-top: 0.7rem;
  border-collapse: collapse;
}
.results-table th,
.results-table td {
  padding: 0.55rem 0.7rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  text-align: left;
  font-size: 0.88rem;
}
.results-table thead th {
  color: var(--muted);
  font: 750 0.64rem/1.3 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--line-strong);
}
.results-table tbody th { font-weight: 650; }
.results-table td[data-num] { white-space: nowrap; }
.wb-table th, .wb-table td { font-size: 0.84rem; }
.wb-table tbody th a { color: var(--ink); }
.wb-table tbody th a:hover { color: var(--accent); }
.alert {
  margin: 0 0 1.4rem;
  padding: 0.8rem 1rem;
  border: 1px solid var(--line-strong);
  border-left: 3px solid var(--accent);
  border-radius: var(--r);
  background: var(--surface);
  font-size: 0.92rem;
}
details {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line-strong);
  color: var(--muted);
  font-size: 0.86rem;
}
details summary {
  cursor: pointer;
  color: var(--ink);
  font: 750 0.7rem/1.4 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
details ul { padding-left: 1.2rem; }
details li + li { margin-top: 0.4rem; }
details a { overflow-wrap: anywhere; }

/* ---------- footer ---------- */
.sg-foot {
  border-top: 1px solid var(--line);
  color: var(--muted);
  background: var(--surface-inset);
  font-size: 0.78rem;
}
.sg-foot .wrap { padding-top: 1rem; padding-bottom: 1rem; }
.sg-foot nav { display: flex; gap: 1rem; flex-wrap: wrap; }
.sg-foot a { color: var(--muted); }
.sg-foot a:hover { color: var(--accent); }
.sg-foot .quiet { opacity: 0.78; }

@media (max-width: 600px) {
  .wrap { padding-inline: 0.65rem; }
  .sg-top .wrap { min-height: 3.6rem; }
  .sg-tag, .sg-calibration { display: none; }
  .sg-nav .wrap { padding-right: 0; }
  main { padding-top: 1.6rem; padding-bottom: 3.25rem; }
  .guides-grid { grid-template-columns: 1fr; }
}