*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  margin: 0;
  font-family: var(--font-body);
  line-height: 1.5;
  background: var(--paper-bg);
  color: var(--paper-ink);
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 500;
  margin: 0 0 0.5em;
  line-height: 1.1;
}
h1 { font-size: clamp(2.5rem, 6vw, 4rem); }
h2 { font-size: clamp(1.9rem, 4vw, 2.75rem); }
h3 { font-size: clamp(1.3rem, 2.5vw, 1.6rem); }

a { text-decoration-thickness: 1px; text-underline-offset: 0.15em; }

.skip-link {
  position: absolute; left: -999px; top: 0;
  background: var(--paper-surface); color: var(--paper-ink); padding: 0.75em 1em; z-index: 100;
}
.skip-link:focus { left: 1em; top: 1em; }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

main { display: block; position: relative; }

/* --- Sheet grammar: every scene is a plotted survey sheet --- */

.scene {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 5rem 1.5rem;
}

.scene--blueprint {
  background-color: var(--blueprint-bg);
  background-image:
    repeating-linear-gradient(0deg, rgb(255 255 255 / 0.035) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(90deg, rgb(255 255 255 / 0.035) 0 1px, transparent 1px 48px);
  color: var(--blueprint-ink);
}
.scene--paper {
  background-color: var(--paper-bg);
  background-image: repeating-linear-gradient(0deg, rgb(14 47 82 / 0.04) 0 1px, transparent 1px 40px);
  color: var(--paper-ink);
}

.scene__sheet {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  width: 100%;
}

/* Sheet corner ticks — the plotted-drawing frame every scene shares */
.scene__sheet::before,
.scene__sheet::after {
  content: "";
  position: absolute;
  width: 1.25rem;
  height: 1.25rem;
  border-color: currentcolor;
  opacity: 0.35;
  pointer-events: none;
}
.scene__sheet::before {
  top: -1.5rem; left: -0.5rem;
  border-top: 1px solid; border-left: 1px solid;
}
.scene__sheet::after {
  bottom: -1.5rem; right: -0.5rem;
  border-bottom: 1px solid; border-right: 1px solid;
}

/* The eyebrow is a title-block label stamped at the sheet's top-left
   corner tick, not a kicker line floating above the heading — the
   heading is the column's true first element. */
.scene__eyebrow {
  position: absolute;
  top: -1.5rem;
  left: 1.1rem;
  display: flex;
  align-items: center;
  gap: 0.5em;
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0;
  white-space: nowrap;
}
.scene--blueprint .scene__eyebrow { color: var(--blueprint-accent); }
.scene--paper .scene__eyebrow { color: var(--paper-accent); }

.scene__sheet h1,
.scene__sheet h2 {
  margin-top: 1.5rem;
}

.scene__index {
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  opacity: 0.6;
}

.field-note {
  font-family: var(--font-data);
  font-size: 0.92rem;
  line-height: 1.6;
}

.data-figure {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
}

.scene--notfound {
  min-height: 100vh;
  text-align: center;
  align-items: center;
}

.site-footer {
  padding: 2rem 1.5rem;
  text-align: center;
  font-size: 0.82rem;
  font-family: var(--font-data);
  background: var(--blueprint-bg-deep);
  color: var(--blueprint-muted);
}
.site-footer a { color: var(--blueprint-accent); }

/* --- Persistent compass-rose chrome --- */

.survey-mark {
  position: fixed;
  top: 1.25rem;
  right: 1.25rem;
  z-index: 20;
  width: 3rem;
  height: 3rem;
  pointer-events: none;
  opacity: 0.85;
  transition: opacity 0.4s ease, transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
  transform-origin: top right;
}
.survey-mark svg { width: 100%; height: 100%; display: block; }
.survey-mark__needle {
  transform-origin: 50% 50%;
  transition: transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}
.survey-mark__ring,
.survey-mark__ticks {
  opacity: 0;
  transition: opacity 0.5s ease 0.15s;
}
.survey-mark--expanded {
  transform: scale(3);
}
.survey-mark--expanded .survey-mark__ring,
.survey-mark--expanded .survey-mark__ticks {
  opacity: 1;
}
@media (max-width: 640px) {
  .survey-mark { width: 2.25rem; height: 2.25rem; top: 0.85rem; right: 0.85rem; }
  .survey-mark--expanded { transform: scale(1.9); }
}
@media (prefers-reduced-motion: reduce) {
  .survey-mark { transition: none; }
}