/* HCI Deep Dives — the artwork leads, the waveform is the interface.
   The base stays quiet; every episode brings its own accent, sampled from its cover. */

@property --accent {
  syntax: "<color>";
  inherits: true;
  initial-value: #61b2d1;
}

:root {
  --bg: #1a1917;
  --surface: #232220;
  --line: #33302c;
  --fg: #edeae4;
  --muted: #a09a90;
  --accent: #61b2d1;
  --shadow: 0 18px 40px -24px rgb(0 0 0 / 0.75);

  --measure: 68ch;
  --gutter: clamp(1rem, 4vw, 2.5rem);

  --display: "Fraunces", ui-serif, Georgia, serif;
  --sans: "Geist", ui-sans-serif, system-ui, -apple-system, sans-serif;
  --mono: "Geist Mono", ui-monospace, "SF Mono", monospace;
  --serif: "Source Serif 4", Georgia, serif;

  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  color-scheme: dark light;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f4f6f8;
    --surface: #ffffff;
    --line: #dde3e9;
    --fg: #16181c;
    --muted: #5a6775;
    --shadow: 0 18px 40px -26px rgb(20 30 45 / 0.35);
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.55;
  font-weight: 350;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* The page glow takes the colour of whatever is playing and crossfades to it */
body::before {
  content: "";
  position: fixed;
  inset: -30vmax;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(40vmax 40vmax at 18% 8%, color-mix(in oklab, var(--accent) 40%, transparent), transparent 70%),
    radial-gradient(32vmax 32vmax at 85% 82%, color-mix(in oklab, var(--accent) 26%, transparent), transparent 70%);
  opacity: 0.35;
  transition: --accent 900ms var(--ease);
  animation: drift 42s var(--ease) infinite alternate;
}

@keyframes drift {
  from { transform: translate3d(-2%, -1%, 0) scale(1); }
  to   { transform: translate3d(3%, 2%, 0) scale(1.14); }
}

a { color: inherit; }

:is(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}

/* Break-out grid: content is centred, the hero can run full width */
.wrap {
  display: grid;
  grid-template-columns:
    [full-start] minmax(var(--gutter), 1fr)
    [content-start] minmax(0, 64rem) [content-end]
    minmax(var(--gutter), 1fr) [full-end];
  padding-bottom: 7rem;
}

.wrap > * { grid-column: content; }
.hero { grid-column: full; }

/* ---------------------------------------------------------------- masthead */

.masthead {
  padding: clamp(2.5rem, 7vw, 5rem) 0 clamp(1.75rem, 4vw, 2.75rem);
  max-width: 46rem;
}

.masthead h1 {
  font-family: var(--display);
  font-optical-sizing: auto;
  font-size: clamp(2.6rem, 8vw, 5rem);
  font-weight: 600;
  letter-spacing: -0.028em;
  line-height: 0.95;
  margin: 0 0 0.75rem;
  view-transition-name: show-title;
}

.masthead p {
  max-width: 52ch;
  margin: 0 0 1.5rem;
  color: var(--muted);
  font-size: clamp(1rem, 1.6vw, 1.125rem);
}

.subscribe { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.subscribe a {
  padding: 0.45rem 1rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.875rem;
  text-decoration: none;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease),
              background 0.25s var(--ease);
}

.subscribe a:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: color-mix(in oklab, var(--accent) 10%, transparent);
}

/* ---------------------------------------------------------------- hero */

.hero {
  --accent: var(--hero-accent, #61b2d1);
  position: relative;
  isolation: isolate;
  display: grid;
  align-content: end;
  min-height: clamp(26rem, 64vh, 40rem);
  padding: 0 var(--gutter) clamp(1.75rem, 4vw, 3rem);
  margin-bottom: clamp(2.5rem, 6vw, 4rem);
  overflow: hidden;
}

.hero-media { position: absolute; inset: 0; z-index: -2; }

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 42%;
  animation: kenburns 36s var(--ease) infinite alternate;
}

@keyframes kenburns {
  from { transform: scale(1) translate3d(0, 0, 0); }
  to   { transform: scale(1.08) translate3d(-1.5%, -1%, 0); }
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(70% 90% at 15% 85%, color-mix(in oklab, var(--accent) 38%, transparent), transparent 70%),
    linear-gradient(to top, var(--bg) 3%, color-mix(in oklab, var(--bg) 86%, transparent) 42%, color-mix(in oklab, var(--bg) 25%, transparent) 100%);
  animation: scrim 900ms var(--ease) backwards;
}

@keyframes scrim { from { opacity: 0; } }

.hero-inner {
  max-width: 64rem;
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "kicker kicker"
    "title  title"
    "play   meta"
    "wave   wave";
  align-items: center;
  column-gap: 1.25rem;
}

.hero .kicker {
  grid-area: kicker;
  color: var(--accent);
  font-size: 0.8125rem;
  font-weight: 500;
  margin: 0 0 0.75rem;
}

.hero h2 {
  grid-area: title;
  font-family: var(--display);
  font-optical-sizing: auto;
  font-size: clamp(1.75rem, 4.4vw, 3rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin: 0 0 1.25rem;
  max-width: 18ch;
  text-wrap: balance;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;        /* long paper titles shouldn't swallow the art */
  overflow: hidden;
}

.hero h2 a { text-decoration: none; }
.hero h2 a:hover { color: var(--accent); }

.hero .play { grid-area: play; width: 3.5rem; height: 3.5rem; }
.hero .meta { grid-area: meta; margin: 0; display: flex; gap: 0.75rem; align-items: center; }
.hero .wave { grid-area: wave; height: 4.5rem; margin-top: 1.25rem; }

/* Title lines wipe up on load */
.hero h2, .hero .kicker {
  animation: rise-in 800ms var(--ease) backwards;
}
.hero h2 { animation-delay: 120ms; }
.hero .meta, .hero .play { animation: rise-in 800ms var(--ease) 240ms backwards; }

@keyframes rise-in {
  from { opacity: 0; transform: translateY(14px); clip-path: inset(0 0 100% 0); }
  to   { opacity: 1; transform: none; clip-path: inset(0 0 -10% 0); }
}

/* ---------------------------------------------------------------- years */

.year { margin-bottom: clamp(2.5rem, 6vw, 4rem); }

.year > h2 {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  font-family: var(--display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 500;
  letter-spacing: -0.02em;
  margin: 0 0 1.5rem;
}

.year > h2::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

.year .count {
  font-family: var(--sans);
  font-size: 0.8125rem;
  font-weight: 400;
  color: var(--muted);
  order: 1;
}

/* ---------------------------------------------------------------- cards */

.episodes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(1.25rem, 2.4vw, 2rem);
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 15.5rem), 1fr));
}

.card {
  --accent: var(--card-accent, #61b2d1);
  position: relative;
  display: flex;
  flex-direction: column;
  transition: transform 0.26s var(--ease);
}

.card-media {
  position: relative;
  aspect-ratio: 1;
  border-radius: 14px;
  overflow: hidden;
  background: color-mix(in oklab, var(--accent) 28%, var(--surface));
  box-shadow: var(--shadow);
  transition: box-shadow 0.26s var(--ease);
}

.card-media .cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s var(--ease), filter 0.26s var(--ease);
}

.card:hover { transform: translateY(-5px); }
.card:hover .card-media .cover,
.card:focus-within .card-media .cover { transform: scale(1.05); }

.card:hover .card-media,
.card:focus-within .card-media {
  box-shadow: 0 20px 44px -20px color-mix(in oklab, var(--accent) 60%, #000);
}

/* The whole card is the link; the play button sits above it */
.card .title a::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 14px;
}

.card .play {
  position: absolute;
  right: 0.75rem;
  bottom: 0.75rem;
  z-index: 1;
  width: 2.75rem;
  height: 2.75rem;
  background: color-mix(in oklab, var(--bg) 72%, transparent);
  backdrop-filter: blur(8px);
  border-color: transparent;
  opacity: 0;
  transform: translateY(6px) scale(0.92);
  transition: opacity 0.24s var(--ease), transform 0.24s var(--ease),
              background 0.24s var(--ease);
}

.card:hover .play,
.card:focus-within .play,
.card.is-active .play { opacity: 1; transform: none; }

@media (hover: none) { .card .play { opacity: 1; transform: none; } }

.card-body { padding-top: 0.9rem; }

.card .title {
  font-family: var(--display);
  font-optical-sizing: auto;
  font-size: 1.0625rem;
  font-weight: 500;
  letter-spacing: -0.012em;
  line-height: 1.25;
  margin: 0 0 0.4rem;
  text-wrap: pretty;
}

.card .title a { text-decoration: none; }
.card:hover .title a { color: var(--accent); }

.card .meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  color: var(--muted);
  font-size: 0.8125rem;
}

.venue-tag {
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  background: color-mix(in oklab, var(--accent) 20%, transparent);
  color: color-mix(in oklab, var(--accent) 75%, var(--fg));
  font-size: 0.75rem;
  font-weight: 450;
}

/* The waveform unfurls on the card being played */
.card .wave-slot {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.42s var(--ease);
}

.card.is-active .wave-slot { grid-template-rows: 1fr; }
.card .wave { height: 2.25rem; margin-top: 0.6rem; overflow: hidden; }
.card:not(.is-active) .wave { visibility: hidden; }

/* Equaliser badge while playing */
.eq {
  position: absolute;
  left: 0.75rem;
  bottom: 0.75rem;
  z-index: 1;
  display: none;
  gap: 2px;
  align-items: flex-end;
  height: 1rem;
  padding: 0.3rem 0.4rem;
  border-radius: 6px;
  background: color-mix(in oklab, var(--bg) 70%, transparent);
  backdrop-filter: blur(8px);
}

.card.is-playing .eq { display: flex; }
.eq i { width: 3px; height: 40%; background: var(--accent); border-radius: 2px;
        animation: bounce 900ms ease-in-out infinite; }
.eq i:nth-child(2) { animation-delay: 150ms; }
.eq i:nth-child(3) { animation-delay: 300ms; }
.eq i:nth-child(4) { animation-delay: 450ms; }

@keyframes bounce { 50% { height: 100%; } }

/* ---------------------------------------------------------------- play button */

.play {
  display: grid;
  place-items: center;
  width: 2.75rem;
  height: 2.75rem;
  flex: none;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: transparent;
  color: var(--fg);
  cursor: pointer;
  transition: border-color 0.22s var(--ease), background 0.22s var(--ease),
              color 0.22s var(--ease), transform 0.22s var(--ease);
}

.play:hover { border-color: var(--accent); color: var(--accent); transform: scale(1.07); }
.play[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: var(--bg); }
.play svg { width: 1rem; height: 1rem; fill: currentColor; }
.play .pause-icon { display: none; }
.play[aria-pressed="true"] .play-icon { display: none; }
.play[aria-pressed="true"] .pause-icon { display: block; }

.row .play, .player .play { grid-row: 1 / span 2; }

/* ---------------------------------------------------------------- waveform */

.wave {
  --progress: 0%;
  position: relative;
  display: block;
  width: 100%;
  height: 2.5rem;
  cursor: pointer;
  touch-action: none;
}

.wave svg { display: block; width: 100%; height: 100%; overflow: visible; }
.wave .bars { fill: var(--muted); opacity: 0.4; }
.wave .played { fill: var(--accent); clip-path: inset(0 calc(100% - var(--progress)) 0 0); }
.wave:hover .bars { opacity: 0.55; }

.hero .wave .bars { fill: var(--fg); opacity: 0.45; }

.wave svg g rect { animation: grow 0.6s var(--ease) backwards; }

@keyframes grow { from { transform: scaleY(0.05); opacity: 0; } }

.wave svg rect { transform-origin: center; }

/* ---------------------------------------------------------------- mini player */

.mini {
  position: fixed;
  left: 50%;
  bottom: 1rem;
  z-index: 20;
  width: min(44rem, calc(100vw - 2rem));
  display: grid;
  grid-template-columns: auto auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.9rem;
  padding: 0.6rem 1rem 0.6rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: color-mix(in oklab, var(--surface) 86%, transparent);
  backdrop-filter: blur(16px) saturate(140%);
  box-shadow: var(--shadow);
  transform: translate(-50%, 160%);
  opacity: 0;
  transition: transform 0.45s var(--ease), opacity 0.3s var(--ease);
}

.mini.shown { transform: translate(-50%, 0); opacity: 1; }
.mini img { width: 2.6rem; height: 2.6rem; border-radius: 8px; object-fit: cover; }
.mini .play { width: 2.4rem; height: 2.4rem; }
.mini .mini-title {
  font-size: 0.875rem;
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.mini .mini-bar {
  grid-column: 1 / -1;
  height: 3px;
  border-radius: 2px;
  background: var(--line);
  overflow: hidden;
}
.mini .mini-bar i {
  display: block;
  height: 100%;
  width: var(--progress, 0%);
  background: var(--accent);
}

/* ---------------------------------------------------------------- episode page */

.episode { max-width: var(--measure); padding-top: clamp(2rem, 5vw, 3.5rem); }

.back {
  display: inline-block;
  margin-bottom: 2rem;
  color: var(--muted);
  font-size: 0.875rem;
  text-decoration: none;
}

.back:hover { color: var(--accent); }

.episode .head {
  display: grid;
  grid-template-columns: 1fr clamp(6.5rem, 20vw, 10rem);
  align-items: start;
  column-gap: 1.75rem;
  margin-bottom: 2rem;
}

.episode .cover {
  grid-column: 2;
  grid-row: 1 / span 2;
  width: 100%;
  height: auto;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 12px;
  box-shadow: var(--shadow);
  view-transition-name: cover;
}

.episode h1 {
  grid-column: 1;
  font-family: var(--display);
  font-optical-sizing: auto;
  font-size: clamp(1.8rem, 4.4vw, 2.8rem);
  font-weight: 550;
  letter-spacing: -0.024em;
  line-height: 1.08;
  margin: 0 0 0.75rem;
  text-wrap: balance;
  view-transition-name: episode-title;
}

.episode .meta { grid-column: 1; color: var(--muted); font-size: 0.875rem; margin: 0; }

.player {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 1.25rem;
  padding: 1.25rem 0 1rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  margin-bottom: 2.5rem;
}

.player .wave { height: 5rem; }
.player .times { grid-column: 2; display: flex; justify-content: space-between; margin-top: 0.5rem; }

.timecode {
  font-family: var(--mono);
  font-size: 0.8125rem;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
}

.notes { font-family: var(--serif); font-size: 1.0625rem; line-height: 1.72; }
.notes p { margin: 0 0 1.1em; }
.notes a { color: var(--accent); text-underline-offset: 2px; }

.download { display: inline-block; margin-top: 1rem; color: var(--muted); font-size: 0.875rem; }

/* ---------------------------------------------------------------- transcript */

.transcript {
  margin-top: 2.5rem;
  border-top: 1px solid var(--line);
  padding-top: 1.25rem;
}

.transcript summary {
  cursor: pointer;
  font-size: 0.9375rem;
  font-weight: 450;
  list-style: none;
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
}

.transcript summary::-webkit-details-marker { display: none; }

.transcript summary::before {
  content: "▸";
  color: var(--accent);
  transition: transform 0.2s var(--ease);
  display: inline-block;
}

.transcript[open] summary::before { transform: rotate(90deg); }
.transcript summary span { color: var(--muted); font-size: 0.8125rem; }

.cues {
  margin-top: 1.25rem;
  font-family: var(--serif);
  font-size: 1rem;
  line-height: 1.68;
}

.cues p {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: 0.75rem;
  margin: 0 0 0.9em;
  border-radius: 6px;
  transition: background 0.3s var(--ease);
}

.cues p.is-current { background: color-mix(in oklab, var(--accent) 14%, transparent); }

.t-cue {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
  background: none;
  border: 0;
  padding: 0.25rem 0;
  text-align: left;
  cursor: pointer;
  align-self: start;
}

.t-cue:hover { color: var(--accent); }

/* ---------------------------------------------------------------- venues */

.crumbs {
  padding-top: clamp(1.5rem, 4vw, 2.5rem);
  font-size: 0.8125rem;
  color: var(--muted);
}

.crumbs a { text-decoration: none; }
.crumbs a:hover { color: var(--accent); }
.crumbs span { margin: 0 0.4rem; opacity: 0.6; }

.masthead .meta { display: flex; gap: 1rem; color: var(--muted); font-size: 0.875rem; }
.venue-link { margin-top: 0.75rem; font-size: 0.875rem; }

.venue-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.25rem;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 18rem), 1fr));
}

.venue-list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line);
}

.venue-list a { text-decoration: none; font-weight: 450; }
.venue-list a:hover { color: var(--accent); }
.venue-list span { color: var(--muted); font-size: 0.8125rem; }

a.venue-tag { text-decoration: none; transition: background 0.2s var(--ease); }
a.venue-tag:hover { background: color-mix(in oklab, var(--accent) 34%, transparent); }

footer {
  border-top: 1px solid var(--line);
  margin-top: 4rem;
  padding-top: 1.5rem;
  color: var(--muted);
  font-size: 0.8125rem;
}

footer a { color: var(--muted); }

/* ---------------------------------------------------------------- entrances */

.reveal { opacity: 0; transform: translateY(12px) scale(0.985); }

.reveal.shown {
  opacity: 1;
  transform: none;
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

@view-transition { navigation: auto; }

/* ---------------------------------------------------------------- small screens */

@media (max-width: 34rem) {
  .hero-inner { grid-template-areas: "kicker kicker" "title title" "play meta" "wave wave"; }
  .episode .head { grid-template-columns: 1fr; }
  .episode .cover { grid-column: 1; grid-row: 1; width: 9rem; margin-bottom: 1rem; }
  .mini { gap: 0.6rem; padding: 0.5rem 0.75rem; }
  .mini img { width: 2.2rem; height: 2.2rem; }
}

@media (prefers-reduced-motion: reduce) {
  body::before,
  .hero-media img,
  .eq i { animation: none; }
  .hero h2, .hero .kicker, .hero .meta, .hero .play, .hero::after { animation: none; }
  .wave svg g rect { animation: none; }
  .reveal, .reveal.shown { opacity: 1; transform: none; transition: none; }
  .card, .card .cover, .card .play, .mini { transition: none; }
  .card:hover { transform: none; }
  .card:hover .card-media .cover { transform: none; }
  .mini { transform: translate(-50%, 0); }
  @view-transition { navigation: none; }
}