:root {
  --void: #0b1425;
  --signal: #65d8e5;
  --branch: #9f91f5;
  --deadline: #e9b96d;
  --text: #e8edf3;
  --muted: rgba(232, 237, 243, 0.58);
  --line: rgba(232, 237, 243, 0.16);
  --font-ui: "Outfit", system-ui, sans-serif;
  --font-display: "Cormorant Garamond", Georgia, serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body {
  margin: 0;
  height: 100%;
  background: var(--void);
  color: var(--text);
  font-family: var(--font-ui);
  font-weight: 300;
}
button:focus-visible, a:focus-visible, select:focus-visible, input:focus-visible {
  outline: 1px solid var(--signal);
  outline-offset: 3px;
}
.skip {
  position: absolute;
  left: 1rem;
  top: -3rem;
  z-index: 20;
  padding: 0.4rem 0.7rem;
  background: var(--void);
  color: var(--text);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.68rem;
}
.skip:focus { top: 0.6rem; }
body[data-tier="text"] #scene,
body[data-tier="text"] #labels { visibility: hidden; }
body[data-tier="text"] .sheet--detail { left: 1rem; right: 1rem; width: auto; }
button, a, input, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: 0; padding: 0; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

#scene { position: fixed; inset: 0; width: 100%; height: 100%; display: block; }
#labels { position: fixed; inset: 0; pointer-events: none; z-index: 2; }
.label {
  position: absolute;
  transform: translate(-50%, -140%);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text);
  text-shadow: 0 8px 18px rgba(11, 20, 37, 0.9);
  white-space: nowrap;
}
.label { pointer-events: auto; cursor: pointer; }
.label.is-dim { opacity: 0.38; }
.label.is-on { color: var(--signal); opacity: 1; }
.label.is-event { letter-spacing: 0.08em; font-size: 0.58rem; color: rgba(232, 237, 243, 0.82); }

.top {
  position: fixed;
  z-index: 4;
  top: 0; left: 0; right: 0;
  display: flex;
  align-items: center;
  gap: 1.4rem;
  padding: 1.05rem 1.4rem 0.4rem;
  background: linear-gradient(180deg, rgba(11, 20, 37, 0.72), transparent 100%);
}
.brand {
  text-decoration: none;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 0.66rem;
  font-weight: 400;
}
.top__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 500;
  letter-spacing: 0.01em;
}
.route, .modes { display: flex; gap: 0.9rem; }
.modes { margin-left: 1.6rem; }
.route { margin-left: auto; }
.route button, .modes button, .seg button {
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.66rem;
  color: var(--muted);
  border-bottom: 1px solid transparent;
  padding-bottom: 0.2rem;
}
.route button.is-on, .modes button.is-on, .seg button.is-on {
  color: var(--deadline);
  border-bottom-color: var(--deadline);
}

.lede {
  position: fixed;
  z-index: 4;
  top: 3.5rem;
  left: 50%;
  transform: translateX(-50%);
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  text-align: center;
  max-width: 36rem;
}

.rail {
  position: fixed;
  z-index: 4;
  left: 1.15rem;
  top: 46%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.85rem;
}
.rail button.is-on { color: var(--text); }
.stages {
  position: fixed;
  z-index: 4;
  left: 50%;
  bottom: 2.5rem;
  transform: translateX(-50%);
  display: flex;
  gap: 1.15rem;
}
.stages button {
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-size: 0.62rem;
  color: var(--muted);
}
.stages button.is-on { color: var(--text); }
.rail button, .rail a {
  text-decoration: none;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-size: 0.64rem;
  color: var(--muted);
}
.rail button:hover, .rail a:hover, .route button:hover, .modes button:hover { color: var(--text); }

.sheet {
  position: fixed;
  z-index: 5;
  left: 1.15rem;
  bottom: 2.6rem;
  width: min(20rem, calc(100vw - 2.4rem));
  padding: 0.2rem 0 0.4rem;
  background: linear-gradient(180deg, rgba(11, 20, 37, 0.2), rgba(11, 20, 37, 0.78));
  backdrop-filter: blur(8px);
}
.sheet--detail {
  left: auto;
  right: 1.3rem;
  top: 5.2rem;
  bottom: auto;
  width: min(22rem, calc(100vw - 2.4rem));
  max-height: calc(100vh - 8.5rem);
  overflow: auto;
  padding: 1rem 1.05rem 1.1rem;
  border: 1px solid var(--line);
  background: linear-gradient(200deg, rgba(11, 20, 37, 0.55), rgba(11, 20, 37, 0.88));
  color-scheme: dark;
  scrollbar-color: rgba(232, 237, 243, 0.35) transparent;
}
.sheet--config {
  left: auto;
  right: 1.3rem;
  top: 5.4rem;
  bottom: auto;
  width: min(20rem, 34vw);
  max-height: calc(100vh - 8.5rem);
  overflow: auto;
  color-scheme: dark;
  scrollbar-color: rgba(232, 237, 243, 0.35) transparent;
  padding: 1rem 1.05rem 1.15rem;
  border: 1px solid var(--line);
  background: linear-gradient(200deg, rgba(11, 20, 37, 0.55), rgba(11, 20, 37, 0.88));
}
.timeline {
  position: fixed;
  z-index: 4;
  left: 8rem;
  right: 8rem;
  bottom: 4.4rem;
  overflow-x: auto;
  scrollbar-color: rgba(232, 237, 243, 0.35) transparent;
}
.timeline::-webkit-scrollbar { height: 4px; }
.timeline::-webkit-scrollbar-thumb { background: rgba(232, 237, 243, 0.35); border-radius: 99px; }
.timeline::-webkit-scrollbar-track { background: transparent; }
.timeline ol { display: flex; gap: 0.85rem; margin: 0; padding: 0 0 0.3rem; list-style: none; }
.timeline button {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.12rem;
  min-width: 7.5rem;
  text-align: left;
  font-size: 0.72rem;
  color: var(--text);
}
.timeline .row-meta { color: var(--deadline); font-size: 0.68rem; }
.mark {
  width: 0.42rem;
  height: 0.42rem;
  border: 1px solid var(--text);
  border-radius: 50%;
  justify-self: center;
}
.mark[data-certainty="recorded"] { background: var(--text); }
.mark[data-certainty="calculated"] { border-color: var(--signal); }
.mark[data-certainty="illustrative"] { border-style: dashed; border-color: var(--deadline); }
.mark[data-certainty="conditional"] { border-radius: 1px; border-color: var(--branch); }
#detail-list { list-style: none; padding: 0; }
.group-label {
  margin-top: 0.85rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-size: 0.62rem;
  color: var(--signal);
}
#detail-list button {
  display: grid;
  grid-template-columns: 0.7rem 1fr;
  column-gap: 0.45rem;
  width: 100%;
  padding: 0.35rem 0;
}
#detail-list .row-title { color: var(--text); }
#detail-list .row-meta { grid-column: 2; color: var(--muted); font-size: 0.72rem; }
.kicker {
  margin: 0 0 0.35rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 0.62rem;
  color: var(--signal);
}
.sheet h2 {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.7rem;
  line-height: 1.05;
}
.hint, #detail-basis, #detail-when, #detail-note, .sheet p {
  margin: 0.35rem 0;
  font-size: 0.84rem;
  line-height: 1.45;
  color: var(--muted);
}
#detail-when { color: var(--deadline); }
.field, .check {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  margin-top: 0.85rem;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.check { flex-direction: row; align-items: flex-start; letter-spacing: 0.02em; text-transform: none; font-size: 0.8rem; }
.field input, .field select, .seg button {
  text-transform: none;
  letter-spacing: 0.04em;
  font-size: 0.84rem;
  color: var(--text);
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  padding: 0.35rem 0;
}
.field-label { margin: 0.9rem 0 0.2rem; font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }
.seg { display: flex; gap: 0.8rem; }
#detail-close { margin-top: 0.8rem; letter-spacing: 0.14em; text-transform: uppercase; font-size: 0.64rem; color: var(--muted); }
#detail-list { display: flex; flex-direction: column; align-items: flex-start; gap: 0.35rem; margin-top: 0.7rem; }
#detail-list button, .inspect button {
  text-align: left;
  font-size: 0.8rem;
  line-height: 1.35;
  color: var(--text);
}
#detail-list button:hover, .inspect button:hover { color: var(--deadline); }

.inspect {
  position: fixed;
  z-index: 4;
  left: 7.5rem;
  bottom: 2.4rem;
  width: min(28rem, 42vw);
  max-height: 34vh;
  overflow: auto;
}
.inspect ol { margin: 0.4rem 0 0; padding-left: 1rem; }
.inspect li { margin: 0.28rem 0; }

.foot {
  position: fixed;
  z-index: 4;
  left: 0; right: 0; bottom: 0;
  margin: 0;
  padding: 0.7rem 1rem 0.85rem;
  text-align: center;
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: rgba(232, 237, 243, 0.42);
  background: linear-gradient(0deg, rgba(11, 20, 37, 0.75), transparent);
}

@media (max-width: 860px) {
  .top { flex-wrap: wrap; gap: 0.6rem; }
  .top__title { flex-basis: 100%; order: 3; font-size: 1.15rem; }
  .lede { top: 6.2rem; }
  body[data-tier="text"] .sheet--detail { top: 8.6rem; max-height: calc(100vh - 12rem); }
  .rail { top: auto; bottom: 4.2rem; transform: none; flex-direction: row; gap: 0.7rem; }
  .sheet--detail, .sheet--config, .inspect { left: 1rem; right: 1rem; width: auto; }
  .timeline { left: 1rem; right: 1rem; }
}