/* one nanosecond — amber phosphor instrument */

:root {
  --bg: #0b0a07;
  --ink: #e9e1cf;
  --dim: #8d8470;
  --faint: #55503f;
  --accent: #ffb454;
  --accent-dim: #a06f2e;
  --line: #3b3628;
  --line-x: 50%;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --serif: "Instrument Serif", Georgia, serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
[hidden] { display: none !important; }

html, body {
  height: 100%;
  overflow: hidden;
  overscroll-behavior: none;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  touch-action: none;
  cursor: crosshair;
}

/* atmosphere: vignette + grain */
body::before {
  content: "";
  position: fixed; inset: 0;
  background:
    radial-gradient(120% 90% at 50% 10%, transparent 40%, rgba(0,0,0,.55) 100%),
    radial-gradient(60% 40% at var(--line-x) 0%, rgba(255,180,84,.05), transparent 70%);
  pointer-events: none;
  z-index: 4;
}
body::after {
  content: "";
  position: fixed; inset: -50%;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='240' height='240' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
  opacity: .05;
  pointer-events: none;
  z-index: 5;
  animation: grain 1.6s steps(4) infinite;
}
@keyframes grain {
  0% { transform: translate(0, 0); }
  25% { transform: translate(-2%, 1%); }
  50% { transform: translate(1%, -2%); }
  75% { transform: translate(-1%, 2%); }
  100% { transform: translate(2%, -1%); }
}
@media (prefers-reduced-motion: reduce) {
  body::after { animation: none; }
}

#stage { position: fixed; inset: 0; overflow: hidden; }

/* the timeline */
#line {
  position: absolute; top: 0; bottom: 0;
  left: var(--line-x);
  width: 1px;
  background: linear-gradient(var(--line), var(--line));
  box-shadow: 0 0 24px rgba(255,180,84,.12);
}
#ruler {
  position: absolute; top: 0; bottom: 0;
  left: calc(var(--line-x) - 8px);
  width: 17px;
  background:
    repeating-linear-gradient(to bottom, var(--accent-dim) 0 1px, transparent 1px 1000px),
    repeating-linear-gradient(to bottom, var(--line) 0 1px, transparent 1px 100px);
  opacity: .8;
}

#world { position: absolute; inset: 0; }
.anchored {
  position: absolute;
  top: 0; left: 0; right: 0;
  will-change: transform;
}

/* intro */
#intro {
  left: 24px;
  right: auto;
  width: min(38vw, 460px);
  padding-top: 9vh;
}
#intro h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(44px, 6vw, 84px);
  line-height: .95;
  letter-spacing: -0.01em;
  margin-bottom: 28px;
  color: var(--ink);
}
#intro h1 em { color: var(--accent); }
#intro p { margin-bottom: 16px; max-width: 42ch; color: var(--dim); }
#intro .rule { color: var(--ink); }
#intro .rule strong { color: var(--accent); font-weight: 500; }
#intro .quiet, #outro .quiet { font-size: 12px; color: var(--faint); }

/* markers */
.marker { pointer-events: none; }
.marker .tick {
  position: absolute;
  top: 0;
  left: calc(var(--line-x) - 14px);
  width: 29px;
  height: 1px;
  background: var(--accent);
  box-shadow: 0 0 8px rgba(255,180,84,.5);
}
.marker .leader {
  position: absolute;
  top: 0;
  left: var(--line-x);
  width: 1px;
  background: linear-gradient(var(--accent-dim), transparent);
  opacity: .6;
}
.marker .card {
  position: relative;
  pointer-events: auto;
  width: min(34vw, 380px);
  padding: 2px 0 0;
}
.side-r .card { margin-left: calc(var(--line-x) + 34px); }
.side-l .card { margin-left: calc(var(--line-x) - 34px); transform: translateX(-100%); text-align: right; }
.side-l .card .source { margin-left: auto; }

.marker .when {
  color: var(--accent);
  font-size: 12px;
  letter-spacing: .12em;
}
.marker .name {
  font-family: var(--serif);
  font-size: clamp(22px, 2.6vw, 32px);
  line-height: 1.1;
  margin: 2px 0 6px;
}
.marker .detail {
  color: var(--dim);
  font-size: 13px;
  max-width: 40ch;
}
.side-l .detail { margin-left: auto; }
.marker .source {
  margin-top: 8px;
  font-size: 11px;
  color: var(--faint);
  max-width: 40ch;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height .35s ease, opacity .35s ease;
  border-left: 2px solid var(--line);
  padding-left: 8px;
}
.side-l .source { border-left: none; border-right: 2px solid var(--line); padding: 0 8px 0 0; }
.marker .card:hover .source, .marker .card:focus-within .source {
  max-height: 120px; opacity: 1;
}

/* compact markers: the dense first-screen cluster */
.marker.compact .when { display: inline; margin-right: 10px; }
.marker.compact .name {
  display: inline;
  font-size: 19px;
}
.marker.compact .detail {
  font-size: 12px;
  color: var(--faint);
  max-width: 52ch;
}
.marker.compact .card:hover .detail { color: var(--dim); }
.marker.compact .source { font-size: 10px; }

/* outro */
#outro {
  left: 50%; right: auto;
  width: min(88vw, 560px);
  margin-left: max(-44vw, -280px);
  text-align: center;
  padding-top: 20vh;
}
#outro h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(40px, 5.4vw, 72px);
  color: var(--accent);
  margin-bottom: 24px;
}
#outro p { color: var(--dim); margin-bottom: 14px; }
#outro p:first-of-type { color: var(--ink); }
#outro .back { margin-top: 32px; }
#outro a { color: var(--accent); text-decoration: none; border-bottom: 1px solid var(--accent-dim); }
#outro footer {
  margin-top: 56px;
  font-size: 12px;
  color: var(--faint);
}

/* HUD */
#hud {
  position: fixed;
  top: 18px; right: 20px;
  z-index: 10;
  text-align: right;
  font-size: 12px;
  letter-spacing: .06em;
  background: rgba(11,10,7,.7);
  padding: 10px 14px;
  border: 1px solid var(--line);
  backdrop-filter: blur(3px);
}
.hud-row { display: flex; gap: 14px; justify-content: space-between; }
.hud-k { color: var(--faint); }
.hud-v { color: var(--accent); min-width: 9ch; text-align: right; font-variant-numeric: tabular-nums; }
.hud-warp .hud-v { animation: blink .5s steps(2) infinite; }
@keyframes blink { 50% { opacity: .2; } }

/* void caption */
#void-caption {
  position: fixed;
  left: 50%; bottom: 72px;
  transform: translateX(-50%);
  z-index: 9;
  font-size: 12px;
  color: var(--dim);
  background: rgba(11,10,7,.75);
  border: 1px solid var(--line);
  padding: 8px 16px;
  white-space: nowrap;
  max-width: 92vw;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* fast travel */
#travel { position: fixed; right: 20px; bottom: 20px; z-index: 11; text-align: right; }
#travel-btn {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--bg);
  background: var(--accent);
  border: none;
  padding: 10px 18px;
  cursor: pointer;
}
#travel-btn:hover { background: var(--ink); }
#travel-panel {
  position: absolute;
  right: 0; bottom: 44px;
  width: 300px;
  max-height: 60vh;
  overflow-y: auto;
  background: rgba(11,10,7,.95);
  border: 1px solid var(--line);
}
#travel-panel button {
  display: flex; justify-content: space-between; gap: 12px;
  width: 100%;
  font-family: var(--mono);
  font-size: 12px;
  text-align: left;
  color: var(--ink);
  background: none;
  border: none;
  border-bottom: 1px solid var(--line);
  padding: 9px 14px;
  cursor: pointer;
}
#travel-panel button:hover { background: rgba(255,180,84,.1); color: var(--accent); }
#travel-panel .d-when { color: var(--faint); }

/* toast + hint */
#toast {
  position: fixed;
  left: 50%; bottom: 20px;
  transform: translateX(-50%);
  z-index: 12;
  font-size: 12px;
  color: var(--accent);
  background: rgba(11,10,7,.9);
  border: 1px solid var(--accent-dim);
  padding: 10px 18px;
  max-width: 88vw;
}
#hint {
  position: fixed;
  left: 24px; bottom: 20px;
  z-index: 8;
  font-size: 12px;
  color: var(--faint);
  transition: opacity .6s;
}
#hint.gone { opacity: 0; }

/* mobile */
@media (max-width: 720px) {
  :root { --line-x: 26px; }
  body { font-size: 13px; }
  #intro {
    left: 52px; width: auto; right: 16px; padding-top: 148px;
  }
  .marker .card, .side-r .card, .side-l .card {
    margin-left: 52px;
    margin-right: 12px;
    width: auto;
    transform: none;
    text-align: left;
  }
  .side-l .detail, .side-l .card .source { margin-left: 0; }
  .side-l .source { border-right: none; border-left: 2px solid var(--line); padding: 0 0 0 8px; }
  .marker .tick { left: calc(var(--line-x) - 10px); width: 21px; }
  #outro { left: 52px; right: 16px; width: auto; margin-left: 0; text-align: left; }
  #hud { top: 12px; right: 12px; font-size: 11px; }
  #hint { display: none; }
}