/* Niels Taatgen — shared site chrome (header, research sub-navigation, footer).
   Used by every page, including the stand-alone interactive explainers.
   All selectors are prefixed "sx-" so they cannot clash with page styles. */

:root {
  --rug-red: #dc002d;
  --rug-red-dark: #a8001f;
  --rug-red-soft: #fdecef;
  --sx-ink: #1d1b1a;
  --sx-muted: #625b57;
  --sx-line: #e6dfdb;
  --sx-warm: #faf6f3;
  --sx-serif: "Iowan Old Style", "Charter", "Georgia", "Cambria", serif;
  --sx-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
}

html { scroll-padding-top: 130px; }

.sx-skip {
  position: absolute; left: -999px; top: 0; background: var(--rug-red); color: #fff;
  padding: 8px 14px; z-index: 200; font: 600 14px var(--sx-sans);
}
.sx-skip:focus { left: 8px; top: 8px; }

/* ---------- Header ---------- */
.sx-header {
  position: sticky; top: 0; z-index: 100; background: #fff;
  border-bottom: 3px solid var(--rug-red);
  font-family: var(--sx-sans);
}
.sx-header-inner {
  max-width: 1120px; margin: 0 auto; padding: 10px 20px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px 24px; flex-wrap: wrap;
}
.sx-brand { display: flex; align-items: center; gap: 16px; text-decoration: none; color: var(--sx-ink); }
.sx-brand img { height: 40px; width: auto; display: block; }
.sx-brand span {
  font: 600 1.1rem/1.2 var(--sx-serif); letter-spacing: .01em;
  border-left: 1px solid var(--sx-line); padding-left: 16px;
}
.sx-nav { display: flex; flex-wrap: wrap; gap: 4px 4px; }
.sx-nav a {
  font: 500 .95rem/1 var(--sx-sans); color: var(--sx-ink); text-decoration: none;
  padding: 9px 12px; border-radius: 4px; border-bottom: 2px solid transparent;
}
.sx-nav a:hover { color: var(--rug-red); }
.sx-nav a[aria-current="page"] { color: var(--rug-red); border-bottom-color: var(--rug-red); font-weight: 600; }
.sx-nav a:focus-visible, .sx-sub a:focus-visible, .sx-brand:focus-visible {
  outline: 2px solid var(--rug-red); outline-offset: 2px;
}

/* ---------- Research sub-navigation ---------- */
.sx-sub { background: var(--sx-warm); border-bottom: 1px solid var(--sx-line); font-family: var(--sx-sans); }
.sx-sub-inner {
  max-width: 1120px; margin: 0 auto; padding: 0 20px;
  display: flex; flex-wrap: wrap; gap: 0 4px; align-items: center;
}
.sx-sub .sx-sub-label {
  font: 600 .72rem/1 var(--sx-sans); letter-spacing: .09em; text-transform: uppercase;
  color: var(--sx-muted); margin-right: 10px; padding: 12px 0;
}
.sx-sub a {
  font: 500 .88rem/1 var(--sx-sans); color: var(--sx-ink); text-decoration: none;
  padding: 12px 10px; border-bottom: 2px solid transparent;
}
.sx-sub a:hover { color: var(--rug-red); }
.sx-sub a[aria-current="page"] { color: var(--rug-red); border-bottom-color: var(--rug-red); font-weight: 600; }

/* ---------- Footer ---------- */
.sx-footer {
  margin-top: 64px; border-top: 3px solid var(--rug-red); background: var(--sx-warm);
  font: .88rem/1.6 var(--sx-sans); color: var(--sx-muted);
}
.sx-footer-inner {
  max-width: 1120px; margin: 0 auto; padding: 22px 20px;
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px;
}
.sx-footer a { color: var(--rug-red-dark); }
.sx-footer p { margin: 0; }

@media (max-width: 640px) {
  .sx-brand span { font-size: 1rem; padding-left: 12px; }
  .sx-brand img { height: 34px; }
  html { scroll-padding-top: 150px; }
}