:root {
  --ink: #121110;
  --ink-2: #1c1a18;
  --rule: #34302b;
  --paper: #f1eadb;
  --paper-2: #b9b0a0;
  --blue: #1f5fbf;
  /* the jacket recolors to whichever era is in focus */
  --era: var(--blue);
  --era-ink: var(--paper);
  --display: "League Gothic", "Archivo", sans-serif;
  --ui: "Archivo", system-ui, sans-serif;
  --gutter: clamp(16px, 4vw, 48px);
  color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { background: var(--ink); }
body {
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font: 400 16px/1.5 var(--ui);
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
}
::selection { background: var(--era); color: var(--era-ink); }
:focus-visible { outline: 3px solid var(--paper); outline-offset: 3px; }
a { color: inherit; text-underline-offset: .2em; }

/* ── Jacket ─────────────────────────────────────────── */
.jacket {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  height: clamp(300px, 46vh, 460px);
  background: var(--era);
  color: var(--era-ink);
  transition: background-color .6s cubic-bezier(.16, 1, .3, 1), color .6s cubic-bezier(.16, 1, .3, 1);
}
.cover {
  position: relative;
  background: var(--era);
  overflow: hidden;
  aspect-ratio: 1;
  height: 100%;
  transition: background-color .6s cubic-bezier(.16, 1, .3, 1);
}
/* duotone: grayscale art multiplied into the era color */
.cover img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  filter: grayscale(1) contrast(1.25) brightness(1.05);
  mix-blend-mode: multiply;
  opacity: 0;
  transition: opacity .5s ease-out;
}
.cover img.on { opacity: 1; }
.jacket.empty .cover {
  background:
    linear-gradient(var(--ink) 0 0) 18% 0 / 22% 100% no-repeat,
    linear-gradient(var(--paper) 0 0) 58% 0 / 9% 100% no-repeat,
    linear-gradient(#d9a521 0 0) 80% 0 / 6% 100% no-repeat,
    var(--era);
}
.jacket-text {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 18px;
  padding: var(--gutter);
  min-width: 0;
}
h1 {
  margin: 0;
  font: 400 clamp(3.5rem, 8vw, 8rem)/.84 var(--display);
  text-transform: uppercase;
  letter-spacing: -.01em;
  text-wrap: balance;
  overflow-wrap: anywhere;
}
h1.long { font-size: clamp(2.6rem, 5vw, 5rem); }
/* empty state: the title is the jacket */
.jacket.empty h1 { font-size: clamp(7rem, 16vw, 13rem); line-height: .8; }
.sub {
  margin: 0;
  max-width: 44ch;
  font: 600 clamp(1.05rem, 1.6vw, 1.35rem)/1.35 var(--ui);
  font-stretch: 85%;
}
.facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 32px;
  margin: 8px 0 0;
  padding-top: 16px;
  border-top: 2px solid currentColor;
}
.facts dt {
  font: 700 .72rem/1 var(--ui);
  font-stretch: 75%;
  text-transform: uppercase;
  letter-spacing: .08em;
  opacity: .8;
}
.facts dd { margin: 4px 0 0; font: 400 2rem/1 var(--display); text-transform: uppercase; }

/* ── Controls ───────────────────────────────────────── */
.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 16px 24px;
  padding: 20px var(--gutter);
  border-bottom: 1px solid var(--rule);
}
.controls label > span, .seg legend {
  display: block;
  margin-bottom: 6px;
  font: 700 .72rem/1 var(--ui);
  font-stretch: 75%;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--paper-2);
}
.user { flex: 1 1 220px; max-width: 340px; }
input, select, button { font: inherit; color: inherit; }
#user {
  width: 100%;
  height: 44px;
  padding: 0 12px;
  background: var(--ink-2);
  border: 1px solid var(--rule);
  border-bottom: 2px solid var(--paper);
  border-radius: 0;
  font-weight: 600;
  caret-color: var(--era);
}
#user::placeholder { color: #8a8273; }
#user:focus { outline: none; border-bottom-color: var(--era); background: #23201d; }
button {
  height: 44px;
  padding: 0 22px;
  border: 0;
  border-radius: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1.35rem/1 var(--display);
  text-transform: uppercase;
  letter-spacing: .03em;
  cursor: pointer;
  transition: background-color .2s ease-out, color .2s ease-out;
}
button:hover { background: var(--era); color: var(--era-ink); }
button:disabled { opacity: .45; cursor: progress; }

.seg { display: flex; margin: 0; padding: 0; border: 0; }
.seg legend { float: left; width: 100%; }
.seg label { position: relative; }
.seg input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.seg label span {
  display: grid; place-items: center;
  height: 44px; padding: 0 16px;
  border: 1px solid var(--rule);
  font: 400 1.25rem/1 var(--display);
  text-transform: uppercase;
  letter-spacing: .03em;
  color: var(--paper-2);
  transition: background-color .2s ease-out, color .2s ease-out;
}
.seg label + label span { border-left: 0; }
.seg input:checked + span { background: var(--paper); color: var(--ink); border-color: var(--paper); }
.seg input:focus-visible + span { outline: 3px solid var(--paper); outline-offset: 2px; }

select {
  height: 44px;
  padding: 0 34px 0 12px;
  background: var(--ink-2) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1.5l5 5 5-5' fill='none' stroke='%23f1eadb' stroke-width='2'/%3E%3C/svg%3E") right 12px center no-repeat;
  border: 1px solid var(--rule);
  border-radius: 0;
  appearance: none;
  font-weight: 600;
}
.range input { width: 180px; height: 44px; margin: 0; accent-color: var(--paper); background: transparent; }
.range output { color: var(--paper); margin-left: 4px; }

.status {
  min-height: 1.5em;
  padding: 14px var(--gutter) 0;
  font-weight: 600;
  font-stretch: 85%;
  color: var(--paper-2);
}
.status.error { color: #ff8a6b; }
.status.warn { color: #e8b84a; }
progress {
  display: block;
  width: calc(100% - 2 * var(--gutter));
  height: 3px;
  margin: 10px var(--gutter) 0;
  border: 0;
  appearance: none;
  background: var(--rule);
}
progress::-webkit-progress-bar { background: var(--rule); }
progress::-webkit-progress-value { background: var(--paper); }
progress::-moz-progress-bar { background: var(--paper); }

/* ── Timeline ───────────────────────────────────────── */
.timeline-wrap {
  overflow-x: auto;
  padding: 20px var(--gutter) 28px;
  scrollbar-color: var(--rule) transparent;
}
.timeline svg { display: block; overflow: visible; }
.timeline .year { font: 400 20px/1 var(--display); fill: var(--paper); letter-spacing: .02em; }
.timeline .tick { stroke: var(--rule); }
.timeline .tick.year-line { stroke: #4a443d; }
.slab { cursor: pointer; outline: none; }
.slab .band { transition: filter .2s ease-out; }
.slab .label { font: 400 17px/1 var(--display); text-transform: uppercase; letter-spacing: .02em; fill: var(--paper); pointer-events: none; }
.slab .wash { fill-opacity: .14; transition: fill-opacity .25s ease-out; }
.slab:hover .wash, .slab:focus-visible .wash, .slab.sel .wash { fill-opacity: .3; }
.slab:focus-visible .wash, .slab.sel .wash { stroke: var(--paper); stroke-width: 2; }
.timeline.dim .slab:not(.sel):not(:hover):not(:focus-visible) { opacity: .45; }
.slab { transition: opacity .25s ease-out; }

/* ── Era index ──────────────────────────────────────── */
.side { padding: 24px var(--gutter) 48px; border-top: 1px solid var(--rule); }
h2 { margin: 0 0 16px; font: 400 2.4rem/1 var(--display); text-transform: uppercase; }
.side ol { list-style: none; margin: 0; padding: 0; columns: 2 420px; column-gap: 48px; }
.side li { break-inside: avoid; }
.side button {
  display: grid;
  grid-template-columns: 12px 7.5rem minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 14px;
  width: 100%;
  height: auto;
  padding: 10px 0;
  background: none;
  color: var(--paper);
  border-bottom: 1px solid var(--rule);
  font: 400 1rem/1.3 var(--ui);
  text-align: left;
  text-transform: none;
  letter-spacing: 0;
}
.side button:hover, .side button[aria-pressed="true"] { background: none; color: var(--paper); }
.side button:hover .n, .side button[aria-pressed="true"] .n { text-decoration: underline; text-decoration-thickness: 2px; }
.side .sw { width: 12px; height: 12px; align-self: center; }
.side .when { font-weight: 700; font-stretch: 75%; font-size: .8rem; letter-spacing: .06em; text-transform: uppercase; color: var(--paper-2); }
.side .n { font-weight: 700; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.side .n small { font-weight: 400; color: var(--paper-2); font-size: .9em; }
.side .p { color: var(--paper-2); font-size: .9rem; }

footer { padding: 24px var(--gutter) 40px; color: var(--paper-2); font-size: .85rem; border-top: 1px solid var(--rule); }

@media (max-width: 760px) {
  .jacket { grid-template-columns: 1fr; height: auto; }
  .cover { aspect-ratio: auto; width: 100%; height: 36vh; }
  .facts dd { font-size: 1.6rem; }
  .side button { grid-template-columns: 12px minmax(0, 1fr) auto; }
  .side .when { grid-column: 2 / -1; order: -1; }
  .range input { width: 100%; }
  .range { flex: 1 1 100%; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}