@font-face {
  font-family: Nunito;
  src: url("./fonts/Nunito.ttf") format("truetype");
  font-style: normal;
  font-weight: 200 1000;
  font-display: swap;
}

:root {
  color-scheme: light;
  --paper: #f8f6f2;
  --ink: #242032;
  --muted: #655e73;
  --line: #e3deea;
  --violet: #762bc2;
  --panel: #fffdfb;
  --inset: clamp(1rem, 3vw, 1.75rem);
  --year-gutter: 5.25rem;
  font-family: Nunito, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--ink);
  background: var(--paper);
}

* { box-sizing: border-box; }
body { margin: 0; }
p, h1 { margin: 0; }
a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 2px solid var(--violet); outline-offset: 4px; }
.shell { width: min(60rem, calc(100% - 2.5rem)); margin-inline: auto; }

.hero {
  background: radial-gradient(ellipse at 90% 16%, #2e2e2e, transparent 52%), #191919;
  color: #fafafa;
  border-block-end: .25rem solid #999;
  padding-block: clamp(1.5rem, 4vw, 2.75rem);
}
.hero h1 {
  font-size: clamp(2.8rem, 8vw, 5.25rem);
  font-weight: 700;
  letter-spacing: -.045em;
  line-height: .98;
}

.header-details {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .35rem 1rem;
  color: #ccc;
  font-size: .84rem;
  margin-block-start: .65rem;
}
.artist-toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  margin-inline-start: auto;
  min-block-size: 1.75rem;
  cursor: pointer;
}
.artist-toggle input {
  position: absolute;
  inset: 0;
  inline-size: 100%;
  block-size: 100%;
  margin: 0;
  opacity: 0;
  cursor: inherit;
}
.artist-toggle-track {
  position: relative;
  inline-size: 2.15rem;
  block-size: 1.15rem;
  border: 1px solid #aaa;
  border-radius: 1rem;
  background: #555;
}
.artist-toggle-track::after {
  content: "";
  position: absolute;
  inset-block-start: 50%;
  inset-inline-start: .17rem;
  inline-size: .72rem;
  block-size: .72rem;
  border-radius: 50%;
  background: #eee;
  transform: translateY(-50%);
}
.artist-toggle input:checked + .artist-toggle-track { background: #ddd; }
.artist-toggle input:checked + .artist-toggle-track::after {
  inset-inline-start: auto;
  inset-inline-end: .17rem;
  background: #222;
}
.artist-toggle input:focus-visible + .artist-toggle-track { outline: 2px solid #ddd; outline-offset: 3px; }
@media (forced-colors: active) {
  .artist-toggle-track { forced-color-adjust: none; border-color: ButtonText; background: ButtonFace; }
  .artist-toggle-track::after { background: ButtonText; }
  .artist-toggle input:checked + .artist-toggle-track { background: Highlight; }
  .artist-toggle input:checked + .artist-toggle-track::after { background: HighlightText; }
  .artist-toggle input:focus-visible + .artist-toggle-track { outline-color: Highlight; }
}
main.shell { padding-block-start: 1rem; }
.median-axis span {
  position: absolute;
  inset-inline-start: var(--position);
  transform: translateX(calc(-1 * var(--position)));
}

.programmes { list-style: none; padding: 0; margin: 0 0 2rem; }
.programme {
  --station-colour: var(--ink);
  border-block-start: 1px solid var(--line);
  background: var(--panel);
  padding: 1rem var(--inset) 1.15rem;
}
.programme[data-station="bbc_radio_one"] { --station-colour: #000; }
.programme[data-station="bbc_radio_two"] { --station-colour: #ef7015; }
.programme[data-station="bbc_radio_three"] { --station-colour: #cd1f2b; }
.programme[data-station="bbc_6music"] { --station-colour: #00f320; }
.programme:first-child { border-radius: .7rem .7rem 0 0; }
.programme:last-child { border-block-end: 1px solid var(--line); border-radius: 0 0 .7rem .7rem; }
.programme-heading { display: flex; align-items: baseline; gap: .45rem; }
.similarity {
  flex: 0 0 6ch;
  font-size: .78rem;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: color-mix(in srgb, var(--station-colour) 40%, var(--ink));
}
.programme-title {
  display: inline-block;
  color: inherit;
  font-size: 1rem;
  font-weight: 700;
  padding: .15rem 0;
  text-decoration: underline;
  text-decoration-color: var(--line);
  text-underline-offset: .17em;
}
.programme-title:hover { text-decoration-color: var(--station-colour); }
.station {
  display: flex;
  align-items: center;
  gap: .35rem;
  font-size: .76rem;
  color: var(--muted);
  margin-block-start: .2rem;
}
.station::before {
  content: "";
  inline-size: .55rem;
  block-size: .55rem;
  border-radius: 50%;
  background: var(--station-colour);
}
.release {
  display: grid;
  grid-template-columns: var(--year-gutter) minmax(0, 1fr);
  grid-template-areas: ". median" "share heatmap";
  align-items: center;
  gap: .15rem 0;
  margin-block: .4rem .75rem;
  font-size: .79rem;
  font-variant-numeric: tabular-nums;
}
.release[data-empty] { grid-template-areas: "share heatmap"; }
.current { grid-area: share; font-weight: 700; white-space: nowrap; }
.median-axis { grid-area: median; position: relative; min-block-size: 1rem; color: var(--muted); }
.heatmap {
  grid-area: heatmap;
  display: grid;
  grid-template-columns: repeat(var(--year-count), minmax(0, 1fr));
  min-block-size: .75rem;
  background: color-mix(in srgb, var(--ink) 2%, transparent);
}
.heatmap span { grid-row: 1; background: color-mix(in srgb, var(--station-colour) var(--share), transparent); }
.artists { padding-inline-start: 1.2rem; margin: 0; font-size: .9rem; line-height: 1.55; }
.programmes:not(.show-artists) .artists { display: none; }
.programmes:not(.show-artists) .release { margin-block-end: 0; }
.artists span { color: var(--muted); font-variant-numeric: tabular-nums; }
.artist-links { display: inline-flex; vertical-align: middle; gap: .15rem; margin-inline-start: .35rem; }
.artist-service { display: inline-grid; place-items: center; inline-size: 1.45rem; block-size: 1.45rem; }
.artist-service img { display: block; filter: grayscale(1); }
.artist-service:hover img, .artist-service:focus-visible img { filter: none; }

@media (max-width: 34rem) {
  :root { --year-gutter: 4.8rem; }
  .shell { width: calc(100% - 1.5rem); }
  .programme-title { min-block-size: 2rem; }
}
@media (pointer: coarse) {
  .programme-title { min-block-size: 2.75rem; }
  .artist-service { inline-size: 1.9rem; block-size: 1.9rem; }
}