/* ─────────────────────────────────────────────────────────────
   Tokens
   ───────────────────────────────────────────────────────────── */
:root{
  /* Off-white sheet — main reading surface */
  --paper:        oklch(0.972 0.008 82);
  --paper-2:      oklch(0.955 0.010 82);
  --paper-3:      oklch(0.925 0.012 82);
  --rule:         oklch(0.86  0.012 82);
  --rule-soft:    oklch(0.91  0.010 82);
  --ink:          oklch(0.18  0.012 60);
  --ink-2:        oklch(0.34  0.012 60);
  --ink-3:        oklch(0.52  0.010 70);
  --ink-4:        oklch(0.66  0.010 70);
  --accent:       oklch(0.58  0.205 28);
  --accent-soft:  oklch(0.58  0.205 28 / 0.10);
  --accent-ring:  oklch(0.58  0.205 28 / 0.32);

  /* Warm aged-newsprint surface — masthead + tab strip only */
  --paper-warm:    #efe4cb;
  --paper-warm-2:  #e6d9b9;
  --paper-warm-3:  #d6c69e;
  --ink-warm:      #2a1f12;
  --rule-warm:     #b69d75;

  --serif:  "Instrument Serif", "Times New Roman", serif;
  --sans:   "Geist", ui-sans-serif, system-ui, sans-serif;
  --mono:   "Geist Mono", ui-monospace, monospace;

  --ease:   cubic-bezier(.2,.65,.2,1);
  --t-fast: 160ms;
  --t-med:  240ms;
  --t-slow: 420ms;

  --maxw: 1320px;
  --gutter: clamp(20px, 4vw, 56px);
}

* { box-sizing: border-box; }
html, body { margin:0; padding:0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
body{
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.5;
  letter-spacing: -0.005em;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* Body grain stripped — main reading surface stays clean off-white. */

::selection { background: var(--accent); color: var(--paper); }

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

/* ─────────────────────────────────────────────────────────────
   Typography utilities
   ───────────────────────────────────────────────────────────── */
.serif    { font-family: var(--serif); font-weight: 400; letter-spacing: -0.01em; }
.italic   { font-style: italic; }
.mono     { font-family: var(--mono); font-weight: 400; letter-spacing: 0; }
.eyebrow  {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--ink-3);
}
.kbd-rule { display:flex; align-items:center; gap:12px; }
.kbd-rule::before, .kbd-rule::after { content:""; flex:1; height:1px; background: var(--rule); }
.dot { display:inline-block; width:6px; height:6px; border-radius:50%; background: var(--accent); }

/* ─────────────────────────────────────────────────────────────
   Top bar
   ───────────────────────────────────────────────────────────── */
.topbar{
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--paper) 88%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--rule-soft);
}
.topbar-inner{
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px var(--gutter);
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 24px;
  align-items: center;
}
.brand{
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--serif);
  font-size: 22px;
  letter-spacing: -0.015em;
  color: var(--ink);
}
.brand-mark{
  width: 14px; height: 14px;
  background: var(--accent);
  display: inline-block;
  transform: translateY(1px);
}
.brand em { font-style: italic; color: var(--ink-2); font-size: 0.78em; margin-left: 2px; }

.tabs{
  display: flex;
  justify-content: center;
  gap: 2px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.tab{
  position: relative;
  padding: 10px 16px;
  color: var(--ink-3);
  border: 0;
  background: transparent;
  border-radius: 999px;
  transition: color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);
}
.tab:hover { color: var(--ink); background: color-mix(in oklab, var(--ink) 4%, transparent); }
.tab:focus-visible { outline: 2px solid var(--accent-ring); outline-offset: 2px; }
.tab[aria-selected="true"]{
  color: var(--ink);
}
.tab[aria-selected="true"]::after{
  content: "";
  position: absolute;
  left: 18px; right: 18px; bottom: 4px;
  height: 2px; background: var(--accent);
  border-radius: 2px;
  animation: underline-in var(--t-med) var(--ease);
}
@keyframes underline-in{ from { transform: scaleX(0); transform-origin: left; } to { transform: scaleX(1); } }

.topbar-meta{
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.04em;
}
.live-dot{
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 var(--accent-ring);
  animation: pulse 2.4s var(--ease) infinite;
}
@keyframes pulse{
  0%   { box-shadow: 0 0 0 0 var(--accent-ring); }
  60%  { box-shadow: 0 0 0 8px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}

/* ─────────────────────────────────────────────────────────────
   Layout shell
   ───────────────────────────────────────────────────────────── */
main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.panel { display: none; }
.panel.is-active { display: block; animation: panel-in var(--t-slow) var(--ease) both; }
@keyframes panel-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Stagger helper */
.stagger > * { opacity: 0; transform: translateY(10px); animation: rise var(--t-slow) var(--ease) forwards; }
.stagger > *:nth-child(1) { animation-delay: 60ms; }
.stagger > *:nth-child(2) { animation-delay: 130ms; }
.stagger > *:nth-child(3) { animation-delay: 200ms; }
.stagger > *:nth-child(4) { animation-delay: 270ms; }
.stagger > *:nth-child(5) { animation-delay: 340ms; }
.stagger > *:nth-child(6) { animation-delay: 410ms; }
@keyframes rise { to { opacity: 1; transform: translateY(0); } }

/* ─────────────────────────────────────────────────────────────
   Footer
   ───────────────────────────────────────────────────────────── */
footer{
  position: relative;
  z-index: 2;
  border-top: 1px solid var(--rule);
  padding: 60px var(--gutter) 28px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 24px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-3);
  /* mirror of the masthead — corners aged, soft transition into the off-white page above */
  background:
    radial-gradient(ellipse 360px 180px at 0% 100%,   rgba(120, 78, 30, 0.12), transparent 65%),
    radial-gradient(ellipse 360px 180px at 100% 100%, rgba(120, 78, 30, 0.10), transparent 65%),
    radial-gradient(ellipse 220px 110px at 6% 92%,    rgba(80, 40, 10, 0.05),  transparent 70%),
    radial-gradient(ellipse 220px 110px at 94% 92%,   rgba(80, 40, 10, 0.04),  transparent 70%),
    linear-gradient(to top,
      color-mix(in oklab, var(--paper-warm) 60%, var(--paper)) 0%,
      color-mix(in oklab, var(--paper-warm) 35%, var(--paper)) 45%,
      var(--paper) 100%);
  isolation: isolate;
  max-width: none;
}
footer::before{
  content: "";
  position: absolute; inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(rgba(58, 38, 18, 0.18) 0.55px, transparent 1.1px),
    radial-gradient(rgba(58, 38, 18, 0.10) 0.4px, transparent 1px);
  background-size: 3px 3px, 7px 7px;
  background-position: 0 0, 1px 2px;
  mix-blend-mode: multiply;
  /* grain fades upward so the join with the page is invisible */
  -webkit-mask-image: linear-gradient(to top, black 0%, black 25%, transparent 95%);
          mask-image: linear-gradient(to top, black 0%, black 25%, transparent 95%);
  opacity: 0.5;
  z-index: 0;
}
footer::after{
  content: "";
  position: absolute; inset: 0;
  pointer-events: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' seed='9'/><feColorMatrix values='0 0 0 0 0.16  0 0 0 0 0.10  0 0 0 0 0.04  0 0 0 0.55 0'/></filter><rect width='100%' height='100%' filter='url(%23n)' opacity='0.45'/></svg>");
  mix-blend-mode: multiply;
  -webkit-mask-image: linear-gradient(to top, black 0%, black 30%, transparent 100%);
          mask-image: linear-gradient(to top, black 0%, black 30%, transparent 100%);
  opacity: 0.28;
  z-index: 0;
}
footer > * { position: relative; z-index: 1; }
footer .colophon{ font-family: var(--serif); font-style: italic; font-size: 18px; color: var(--ink-2); letter-spacing: -0.01em; }

/* ─────────────────────────────────────────────────────────────
   Responsive
   ───────────────────────────────────────────────────────────── */
@media (max-width: 980px){
  .kpi-strip{ grid-template-columns: repeat(2, 1fr); }
  .kpi:nth-child(odd){ border-right: 1px solid var(--rule-soft); }
  .kpi:nth-child(even){ border-right: 0; }
  .kpi { border-bottom: 1px solid var(--rule-soft); }
  .kpi:nth-last-child(-n+2){ border-bottom: 0; }
  .kpi:nth-child(5){ grid-column: 1 / -1; border-right: 0; }

  .nav-grid{ grid-template-columns: 1fr; }
  .nav-card{ border-right: 0; border-bottom: 1px solid var(--rule-soft); min-height: auto; }
  .nav-card:last-child{ border-bottom: 0; }

  .section-head{ grid-template-columns: 1fr; gap: 18px; }
  .about{ grid-template-columns: 1fr; gap: 28px; }
  .about-body{ grid-template-columns: 1fr; gap: 18px; }

  .tab-head{ grid-template-columns: 1fr; gap: 18px; }

  .map-layout{ grid-template-columns: 1fr; }
  .controls{ position: relative; top: auto; }

  .charts{ grid-template-columns: 1fr; }

  .insight{ grid-template-columns: 1fr; gap: 28px; }
  .insight:nth-child(even) .insight-text{ order: 0; }
  .insight:nth-child(even) .insight-viz { order: 1; }
}
@media (max-width: 640px){
  .topbar-inner{ grid-template-columns: 1fr; gap: 12px; }
  .tabs{ justify-content: flex-start; overflow-x: auto; }
  .topbar-meta{ display: none; }
  .kpi-strip{ grid-template-columns: 1fr; }
  .kpi { border-right: 0 !important; padding: 20px 0; }
  .kpi:nth-child(5){ grid-column: auto; }
  footer{ grid-template-columns: 1fr; }
}