/* Gateway Arch viewer chrome. Set in the Fossett Laboratory system: Libre
   Baskerville for display, Source Sans 3 for the interface, warm neutrals, one
   green accent, flat surfaces. The scene leads; the chrome recedes. */

@font-face{font-family:"Libre Baskerville";font-style:normal;font-weight:400;font-display:swap;src:url(fonts/libre-baskerville-latin-400-normal.woff2) format("woff2")}
@font-face{font-family:"Libre Baskerville";font-style:italic;font-weight:400;font-display:swap;src:url(fonts/libre-baskerville-latin-400-italic.woff2) format("woff2")}
@font-face{font-family:"Libre Baskerville";font-style:normal;font-weight:700;font-display:swap;src:url(fonts/libre-baskerville-latin-700-normal.woff2) format("woff2")}
@font-face{font-family:"Source Sans 3";font-style:normal;font-weight:400;font-display:swap;src:url(fonts/source-sans-3-latin-400-normal.woff2) format("woff2")}
@font-face{font-family:"Source Sans 3";font-style:normal;font-weight:600;font-display:swap;src:url(fonts/source-sans-3-latin-600-normal.woff2) format("woff2")}

:root{
  color-scheme:light;
  --paper:#faf8f5;
  --stone:#e8e4de;
  --green:#4a6741;
  --green-deep:#3c5535;
  --brown:#7c6649;
  --ink:#2c2418;
  --surface:#faf8f5f2;
  --serif:"Libre Baskerville",Georgia,"Times New Roman",serif;
  --sans:"Source Sans 3",system-ui,-apple-system,"Segoe UI",sans-serif;
  --radius:8px;
  --edge:40px;
  font-family:var(--sans);
  font-size:16px;
  line-height:1.5;
  color:var(--ink);
  background:var(--paper);
}
*{box-sizing:border-box}
body{margin:0;overflow:hidden}
::selection{background:#4a674133;color:var(--ink)}
:focus-visible{outline:2px solid var(--green);outline-offset:3px;border-radius:var(--radius)}

#viewer{position:fixed;inset:0}
canvas{display:block;touch-action:none}

/* A paper wash behind the wordmark and title so they read over the sky.
   Lifted almost entirely in the immersive viewpoints. */
body::before{content:"";position:fixed;inset:0;z-index:1;pointer-events:none;
  background:linear-gradient(90deg,#faf8f5b8 0%,#faf8f570 16%,#faf8f500 34%);
  transition:opacity .4s ease}
body[data-view="ground"]::before,body[data-view="river"]::before{opacity:.25}

header,.intro,.controls,.walk-controls,.bottom{z-index:2}

header{position:absolute;top:28px;left:var(--edge);right:var(--edge);pointer-events:none}
.brand{display:inline-block;pointer-events:auto;font-size:.875rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--ink);text-decoration:none}
.brand:hover{color:var(--green)}

.intro{position:absolute;top:18%;left:var(--edge);pointer-events:none;transition:opacity .4s ease}
body[data-view="ground"] .intro,body[data-view="river"] .intro{opacity:0}
body[data-view="busch"] .intro,body[data-view="enterprise"] .intro,body[data-view="dome"] .intro{opacity:0}
.intro h1{font-family:var(--serif);font-weight:400;font-size:clamp(52px,6.4vw,96px);line-height:.95;letter-spacing:-.03em;margin:0;text-wrap:balance}
.intro h1 em{font-style:italic;font-weight:400}
.facts{display:flex;gap:40px;margin-top:28px}
.facts span{display:flex;flex-direction:column;gap:4px;font-size:.75rem;letter-spacing:.06em;text-transform:uppercase;color:var(--brown)}
.facts strong{font-family:var(--serif);font-weight:400;font-size:1.5rem;letter-spacing:0;text-transform:none;color:var(--ink)}

/* One flat panel: viewpoint, lighting, and the immersive entry stay together. */
.controls{position:absolute;bottom:72px;left:50%;transform:translateX(-50%);
  display:flex;align-items:center;gap:0;padding:4px;
  background:var(--surface);border:1px solid var(--stone);border-radius:var(--radius);white-space:nowrap}
.views{display:flex;gap:2px}
button{font:inherit;font-family:var(--sans);font-size:1rem;font-weight:600;line-height:1;
  cursor:pointer;border:0;background:transparent;color:var(--ink);
  min-height:44px;padding:0 18px;border-radius:var(--radius)}
button:hover{background:var(--stone)}
button[aria-pressed="true"]{background:var(--green);color:var(--paper)}
button[aria-pressed="true"]:hover{background:var(--green-deep)}
.divider{align-self:stretch;width:1px;background:var(--stone);margin:0 8px}

/* Walking: a D-pad, thumbs-first. Shown only beneath the Arch. */
.walk-controls{display:none;position:absolute;bottom:136px;left:50%;transform:translateX(-50%);
  grid-template-columns:repeat(3,48px);grid-template-rows:repeat(2,48px);gap:4px;padding:4px;
  background:var(--surface);border:1px solid var(--stone);border-radius:var(--radius)}
body[data-view="ground"] .walk-controls{display:grid}
.walk-controls button{width:48px;height:48px;min-height:0;padding:0;font-size:1.375rem;font-weight:400;touch-action:manipulation}
.walk-controls [data-step="KeyW"]{grid-column:2;grid-row:1}
.walk-controls [data-step="KeyA"]{grid-column:1;grid-row:2}
.walk-controls [data-step="KeyS"]{grid-column:2;grid-row:2}
.walk-controls [data-step="KeyD"]{grid-column:3;grid-row:2}

.bottom{position:absolute;bottom:20px;left:var(--edge);right:var(--edge);
  display:flex;align-items:flex-end;justify-content:space-between;gap:16px;font-size:.875rem;color:var(--ink)}
.bottom p{margin:0;padding:8px 12px;background:var(--surface);border:1px solid var(--stone);border-radius:var(--radius)}
.bottom button{min-height:0;padding:8px 12px;font-size:.875rem;font-weight:400;color:var(--ink);
  background:var(--surface);border:1px solid var(--stone);border-radius:var(--radius)}
.bottom button:hover{color:var(--green);background:var(--paper)}

dialog{max-width:560px;width:calc(100% - 32px);border:1px solid var(--stone);border-radius:var(--radius);padding:32px 36px;background:var(--paper);color:var(--ink)}
dialog::backdrop{background:#2c241866}
dialog h2{font-family:var(--serif);font-weight:700;font-size:clamp(1.5rem,3vw,1.875rem);line-height:1.375;margin:0 0 16px}
dialog p{font-size:1rem;line-height:1.625;margin:0 0 14px}
dialog p:last-child{margin-bottom:0}
dialog a{color:var(--green);text-underline-offset:3px}
#close{float:right;min-height:0;width:40px;height:40px;padding:0;margin:-12px -16px 0 0;font-size:24px;font-weight:400;line-height:1}
#runtime-stats{color:var(--brown);font-size:.875rem}

/* Three.js injects viewport-relative styles; the named control-bar mount wins. */
.xr-entry{display:flex;align-items:center}
#VRButton{position:static!important;inset:auto!important;margin:0!important;width:auto!important;min-height:44px!important;
  font-family:var(--sans)!important;font-size:.875rem!important;font-weight:600!important;
  color:var(--ink)!important;background:var(--surface)!important;border:1px solid var(--stone)!important;
  border-radius:var(--radius)!important;padding:0 18px!important;opacity:1!important;z-index:auto!important}
#VRButton:hover{background:var(--stone)!important}
#VRButton:focus-visible{outline:2px solid var(--green)!important;outline-offset:3px!important}
body.xr header,body.xr .intro,body.xr .controls,body.xr .walk-controls,body.xr .bottom,body.xr::before{display:none}

@media (max-width:1050px){
  :root{--edge:16px}
  header{top:16px}
  .intro{top:11%}
  .intro h1{font-size:52px}
  .facts{gap:24px;margin-top:18px}
  .facts strong{font-size:22px}
  .controls{left:var(--edge);right:var(--edge);transform:none;flex-wrap:wrap;bottom:88px;white-space:normal}
  .views{flex:1 1 100%;display:grid;grid-template-columns:repeat(3,1fr)}
  .views button{padding:0 6px;font-size:.875rem;line-height:1.15;white-space:normal}
  .divider{display:none}
  #light,.xr-entry{flex:1 1 calc(50% - 2px);margin-top:4px}
  #light{border-top:1px solid var(--stone);border-radius:0 0 0 var(--radius);padding-top:2px}
  #VRButton{width:100%!important;border-radius:0 0 var(--radius) 0!important}
  .walk-controls{bottom:200px}
  .bottom{flex-direction:column;align-items:flex-start;gap:8px;bottom:16px}
  .bottom p{line-height:1.4}
  dialog{padding:24px 20px}
  dialog h2{font-size:24px}
}

@media (prefers-reduced-motion:reduce){
  body::before,.intro{transition:none}
}