:root {
  --ink: #e8e3d3;
  --accent: #ffb454;
  --bg: #000000;
  --top-rail-h: 48px;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, "DejaVu Sans Mono", monospace;
  font-size: 15px;
  line-height: 1.65;
}

a {
  color: var(--ink);
}

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 20;
  background: var(--bg);
  padding: 0.5em 1em;
  border: 1px solid var(--ink);
}

.skip-link:focus {
  left: 0.5em;
  top: 0.5em;
}

header.site {
  max-width: 68ch;
  margin: 0 auto;
  padding: 4rem 1.25rem 2rem;
  position: relative;
  z-index: 2;
}

header.site h1 {
  font-size: 1.1rem;
  letter-spacing: 0.12em;
  margin: 0 0 0.75rem;
  font-weight: 700;
}

.social-links {
  position: fixed;
  top: max(2px, env(safe-area-inset-top));
  right: max(8px, env(safe-area-inset-right));
  z-index: 12;
  display: flex;
  align-items: center;
  gap: 2px;
  height: 44px;
  /* Opaque so the horizontally-scrolling shelf chips are cleanly masked
     where they pass under this fixed rail (no glyph bleed at 390px). */
  background: #000000;
}

.social-link {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border: 1px solid transparent;
  border-radius: 2px;
}

.social-link:hover {
  border-color: rgba(255, 255, 255, 0.35);
}

.social-link:focus-visible {
  outline: 2px solid #ffffff;
  outline-offset: -4px;
}

.social-link svg {
  display: block;
  width: auto;
}

.social-link--github svg {
  height: 22px;
}

.social-link--linkedin svg {
  height: 21px;
}

main {
  position: relative;
  z-index: 1;
}

.prose {
  max-width: 68ch;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2.5rem;
  position: relative;
  z-index: 2;
}

.prose h2 {
  font-size: 0.95rem;
  letter-spacing: 0.14em;
  text-transform: lowercase;
  opacity: 0.85;
  margin: 0 0 1rem;
}

/* Dim the ink via color alpha, not element opacity: in ocean mode the
   summary's black scrim comes from the `.prose > *` backing, and element
   opacity would fade that scrim too — letting bright glyphs bleed
   through the subtitle. Alpha on the text alone keeps the scrim solid. */
.scene-summary {
  color: rgba(232, 227, 211, 0.62);
  font-size: 0.9em;
}

.scene-sign {
  letter-spacing: 0.08em;
  opacity: 0.85;
}

/* Shelf: static nav list by default (no-JS), fixed strip when enhanced. */
#shelf ul,
#shelf ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75em;
  margin: 0;
  padding: 0.5rem 1.25rem;
  max-width: 68ch;
  margin-inline: auto;
}

#shelf a {
  font-size: 0.85em;
  opacity: 0.8;
}

.shelf-slot {
  background: transparent;
  color: var(--ink);
  border: 1px solid rgba(232, 227, 211, 0.18);
  font-family: inherit;
  padding: 2px;
  cursor: pointer;
  position: relative;
  display: block;
}

.shelf-item {
  max-width: 52px;
  opacity: 1;
  transform: translateX(0);
  visibility: visible;
  transition:
    max-width 320ms cubic-bezier(0.22, 0.75, 0.18, 1),
    opacity 220ms ease-out,
    transform 320ms cubic-bezier(0.22, 0.75, 0.18, 1);
}

.shelf-slot:focus-visible {
  outline: 1px solid var(--ink);
}

.shelf-glyph {
  margin: 0;
  font-size: 6px;
  line-height: 1.05;
  letter-spacing: 0;
  opacity: 0.25;
  white-space: pre;
}

.shelf-glyph.is-docked {
  opacity: 0.95;
}

.shelf-chip {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  z-index: 11;
  background: var(--bg);
  border: 1px solid rgba(232, 227, 211, 0.45);
  padding: 0.3em 0.7em;
  font-size: 11px;
  white-space: nowrap;
  max-width: 60vw;
  overflow: hidden;
  text-overflow: ellipsis;
}

.shelf-slot:hover .shelf-chip,
.shelf-slot:focus-visible .shelf-chip {
  display: block;
}

body.ocean #shelf {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  align-items: stretch;
  gap: 0.5em;
  padding: 4px 8px;
  min-height: var(--top-rail-h);
  background: rgba(0, 0, 0, 0.88);
  border-bottom: 1px solid rgba(232, 227, 211, 0.2);
  overflow-x: auto;
  scrollbar-width: none;
}

body.ocean #shelf::-webkit-scrollbar {
  display: none;
}

body.ocean #shelf ol {
  padding: 0 calc(98px + env(safe-area-inset-right)) 0 0;
  margin: 0;
  gap: 0.4em;
  flex-wrap: nowrap;
}

body.ocean #shelf > ul {
  display: none;
}

body.ocean #shelf:not(.shelf-expanded) .shelf-item:not([data-slot="0"]) {
  max-width: 0;
  opacity: 0;
  transform: translateX(-6px);
  visibility: hidden;
  pointer-events: none;
}

body.ocean #shelf.shelf-expanded .shelf-item {
  transition-delay: calc(var(--reveal-index) * 65ms);
}

body:not(.ocean) #shelf .shelf-slots,
body:not(.ocean) .dock-traveler {
  display: none !important;
}

body.ocean header.site {
  height: 0;
  margin: 0;
  padding: 0;
  overflow: hidden;
}

/* Ocean mode: the field behind everything, sticky scene stages. */
#ocean-field {
  display: none;
}

body.ocean #ocean-field {
  display: block;
  position: fixed;
  inset: 0;
  z-index: 0;
}

.scene-stage {
  display: none;
}

body.ocean section[data-scene] {
  min-height: var(--section-h, auto);
}

body.ocean .scene-stage {
  display: flex;
  position: sticky;
  top: 0;
  height: 100vh;
  align-items: center;
  justify-content: center;
  z-index: 1;
}

body.ocean .prose {
  margin-top: -62vh;
  padding-bottom: 24vh;
}

/* The gate chapter starts below the curtain wall's sill band, so the
   airliner and the glass grid stay clear while it reads. */
body.ocean section[data-scene="airport-gate"] .prose {
  margin-top: -26vh;
}

/* The stage chapter starts below the stage-floor line of the
   proscenium (~72vh when the canvas is centered) — the heading rises
   over the seat rows, never over the ghost light or the figure. */
body.ocean section[data-scene="stage"] .prose {
  margin-top: -26vh;
}

/* The tower chapter starts below the arcade's street line so the
   Humana shaft, crown, and the sweeping EKG pulse stay clear. */
body.ocean section[data-scene="corridor"] .prose {
  margin-top: -43vh;
}

/* The learning hall's floor is the open zone: the prose enters below
   the shelf wall's floor line, where only the Sphero's trail glides. */
body.ocean section[data-scene="classroom"] .prose {
  margin-top: -38vh;
}

/* The microphone chapter starts below the pedestal's mid-steps; the
   dome, voice arcs, and yoke stay clear while it reads. */
body.ocean section[data-scene="kitchen-table"] .prose {
  margin-top: -42vh;
}

/* The exchange facade houses text well in its dark colonnade voids:
   the deepest pull keeps the pediment and ticker band clear. */
body.ocean section[data-scene="trading-floor"] .prose {
  margin-top: -62vh;
}

/* The arrival chapter starts below the beam wash on the platform
   floor, keeping the car face and headlight cones clear. */
body.ocean section[data-scene="subway-platform"] .prose {
  margin-top: -35vh;
}

body.ocean .prose > * {
  background: rgba(0, 0, 0, 0.78);
}

.canvas-box {
  position: relative;
}

.scene-canvas {
  display: block;
}

.dock-traveler {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 9;
  margin: 0;
  font-size: 8px;
  line-height: 1.05;
  white-space: pre;
  color: var(--ink);
  transform-origin: top left;
  pointer-events: none;
  will-change: transform, opacity;
}

@media (prefers-reduced-motion: reduce) {
  .shelf-item {
    transition: none !important;
  }

  .dock-traveler {
    display: none !important;
  }
}

@media (max-width: 720px) {
  body {
    font-size: 14px;
  }
}