/* B2 The B-Side. Owned by Agent 3. */

.b-side {
  position: relative;
  overflow: clip;
  isolation: isolate;
}
.b-side__inner {
  position: relative;
  max-width: var(--content-max);
  margin-inline: auto;
}

/* Decorative half-disc peeking in from the side, like a flipped record. */
.b-side__backdrop {
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}
.b-side__disc {
  position: absolute;
  top: 2rem;
  left: -14rem;
  width: 28rem;
  aspect-ratio: 1;
  border-radius: 50%;
  background:
    radial-gradient(circle, var(--accent-3) 0 3%, var(--vinyl) 3.5% 16%, color-mix(in srgb, var(--accent-3) 35%, var(--surface)) 16.5% 30%, transparent 30.5%),
    repeating-radial-gradient(circle, var(--vinyl) 0 2px, var(--vinyl-groove) 2px 3px);
  opacity: .35;
}
@media (min-width: 64rem) {
  .b-side__disc { left: auto; right: -12rem; top: 0; }
}

.b-side h3 {
  margin: 0 0 var(--space-3);
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 1.1rem + 1vw, 1.75rem);
  line-height: 1.2;
  color: var(--text);
}
.b-side p {
  max-width: var(--measure);
  line-height: 1.7;
  color: var(--text-muted);
}

/* ---------- Family + DJ years ---------- */
.b-side__top {
  display: grid;
  gap: var(--space-6);
  margin-top: var(--space-6);
}
@media (min-width: 56rem) {
  .b-side__top {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: var(--space-8);
    align-items: start;
  }
}
.b-side__family {
  padding: var(--space-5);
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--line);
  border-top: 4px solid var(--accent);
}
.b-side__family p { margin: 0; color: var(--text); font-size: 1.0625rem; }
.b-side__dj p { margin: 0 0 var(--space-4); }
.b-side__dj p:first-of-type {
  color: var(--text);
  font-size: 1.125rem;
}

/* ---------- Lessons ---------- */
.b-side__lessons { margin-top: var(--space-8); }
.b-side__lesson-list {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 14rem), 1fr));
  counter-reset: lesson;
}
.lesson {
  counter-increment: lesson;
  padding: var(--space-5);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--surface-2), var(--surface));
}
.lesson::before {
  content: counter(lesson, decimal-leading-zero);
  display: block;
  margin-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--accent-2);
}
.lesson h4 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-display);
  font-size: 1.125rem;
  line-height: 1.25;
  color: var(--text);
}
.lesson p { margin: 0; line-height: 1.6; }

/* ---------- Genre EQ ---------- */
.b-side__eq-block {
  margin-top: var(--space-8);
  padding: clamp(1rem, 3vw, 2rem);
  border-radius: calc(var(--radius) * 1.5);
  border: 1px solid var(--line);
  background:
    radial-gradient(120% 80% at 100% 0%, color-mix(in srgb, var(--accent-2) 8%, transparent), transparent 60%),
    var(--bg-deep);
}
.b-side__eq-intro { margin: 0 0 var(--space-5); }

.b-side__eq-grid {
  display: grid;
  gap: var(--space-5);
}
@media (min-width: 56rem) {
  .b-side__eq-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: stretch;
  }
}

.b-side__genres {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-content: start;
}
.b-side__hint {
  flex-basis: 100%;
  margin: var(--space-4) 0 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}
.genre {
  min-height: 2.75rem;
  padding: var(--space-2) var(--space-4);
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-family: var(--font-display);
  font-weight: 500;
  cursor: pointer;
}
.genre:hover { border-color: var(--accent-2); }
.genre:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 2px;
}
/* Selected state uses fill, weight and a tick, not colour alone. */
.genre[aria-pressed="true"] {
  background: var(--accent-2);
  border-color: var(--accent-2);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent-2) 25%, transparent);
  color: var(--on-accent);
  font-weight: 700;
}
.genre[aria-pressed="true"]::before {
  content: "";
  display: inline-block;
  width: 0.45em;
  height: 0.8em;
  margin-right: 0.5em;
  border: solid currentColor;
  border-width: 0 2px 2px 0;
  rotate: 45deg;
  translate: 0 -0.1em;
}

.eq-panel {
  display: grid;
  gap: var(--space-4);
  padding: var(--space-4);
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--line);
}
.eq {
  display: grid;
  gap: var(--space-2);
}
.eq {
  position: relative;
}
.eq__wave {
  height: 2.25rem;
  border-radius: var(--radius-sm);
  --wave-color: oklch(0.78 0.13 var(--genre-hue, 183));
  --wave-seed: 1;
  --wave-bars: 64;
  --wave-progress: 0.4;
  /* Fallback: a simple striped strip. */
  background:
    repeating-linear-gradient(90deg, color-mix(in srgb, var(--accent-2) 55%, transparent) 0 2px, transparent 2px 6px)
    center / 100% 40% no-repeat,
    var(--bg-deep);
  opacity: .8;
}
@supports (background: paint(waveform)) {
  .eq__wave { background: paint(waveform), var(--bg-deep); }
  /* If the worklet has not loaded, paint() draws nothing and the dark strip simply shows. */
}
.eq__bars {
  position: relative;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(3px, 1vw, 8px);
  align-items: end;
  height: clamp(8rem, 22vw, 12rem);
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  background:
    repeating-linear-gradient(0deg, transparent 0 calc(25% - 1px), var(--line) calc(25% - 1px) 25%),
    var(--bg-deep);
  view-transition-name: bside-eq;
}
/* LED segment gaps drawn over all bars so they stay even at any height. */
.eq__bars::after {
  content: "";
  position: absolute;
  inset: var(--space-2);
  background: repeating-linear-gradient(0deg, transparent 0 6px, var(--bg-deep) 6px 8px);
  pointer-events: none;
}
.eq__bar {
  --h: 0.35;
  display: block;
  height: 100%;
  transform: scaleY(var(--h));
  transform-origin: bottom;
}
.eq__bar > span {
  display: block;
  height: 100%;
  border-radius: 4px 4px 2px 2px;
  background: linear-gradient(0deg, var(--accent-2), var(--accent-3) 60%, var(--accent));
  transform-origin: bottom;
}
@supports (color: oklch(0 0 0)) {
  .b-side__eq-block[data-genre] .eq__bar > span {
    background: linear-gradient(in oklch 0deg,
      oklch(0.8 0.13 var(--genre-hue)),
      oklch(0.78 0.14 calc(var(--genre-hue) + 60)) 60%,
      oklch(0.75 0.16 calc(var(--genre-hue) + 120)));
  }
  .b-side__eq-block[data-genre] {
    background:
      radial-gradient(120% 80% at 100% 0%, oklch(0.5 0.15 var(--genre-hue) / .22), transparent 60%),
      var(--bg-deep);
  }
}
.eq__scale {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .08em;
}
.eq-panel__now { min-height: 5.5rem; }
.eq-panel__label {
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--accent-2);
}
.eq-panel__text { margin: 0; color: var(--text); view-transition-name: bside-blurb; }
.eq-panel__text strong {
  font-family: var(--font-display);
}

/* Bar movement and idle breathing: motion OK only. Nothing flashes. */
:root[data-motion="full"]:not([data-calm="on"]) .eq__bar {
  transition: transform 900ms var(--spring);
}
:root[data-motion="full"]:not([data-calm="on"]) .eq__wave {
  transition: --wave-progress var(--dur-slow) var(--spring-soft);
}
/* View transition styling for the genre switch (only runs when motion is OK). */
::view-transition-old(bside-blurb) { animation: bside-out 220ms var(--ease-out) both; }
::view-transition-new(bside-blurb) { animation: bside-in 520ms var(--spring) both; }
::view-transition-group(bside-eq) { animation-timing-function: var(--spring); animation-duration: 520ms; }
@keyframes bside-out { to { opacity: 0; transform: translateY(-0.5rem); } }
@keyframes bside-in { from { opacity: 0; transform: translateY(0.75rem); } }
:root[data-motion="full"]:not([data-calm="on"]) .eq.is-breathing .eq__bar > span {
  animation: eq-breathe 3.2s ease-in-out infinite;
  animation-delay: calc(var(--i, 0) * -0.27s);
}
@keyframes eq-breathe {
  0%, 100% { transform: scaleY(1); }
  50% { transform: scaleY(0.9); }
}

/* Notes list: plain visible list without JS; with JS the panel shows the chosen one. */
.b-side__notes {
  margin: var(--space-5) 0 0;
  display: grid;
  gap: var(--space-3);
}
.b-side__notes dt { font-family: var(--font-display); font-weight: 700; color: var(--text); }
.b-side__notes dd { margin: 0; color: var(--text-muted); }
.b-side.is-enhanced .b-side__notes { display: none; }

/* ---------- Desert island discs ---------- */
.b-side__island { margin-top: var(--space-8); padding-bottom: var(--space-4); }
.b-side__island-intro { margin: 0 0 var(--space-5); }
.discs {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 16rem), 1fr));
}
.disc {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-4) var(--space-3) var(--space-3);
  border-radius: 999px 1rem 1rem 999px;
  border: 1px solid var(--line);
  background: var(--surface);
}
.disc__label {
  flex: none;
  display: grid;
  place-items: center;
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 50%;
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--on-accent);
  background:
    radial-gradient(circle, var(--accent) 0 54%, var(--vinyl) 55% 60%, var(--vinyl-groove) 61% 100%);
  box-shadow: inset 0 0 0 1px var(--line);
}
.disc:nth-child(2) .disc__label { background: radial-gradient(circle, var(--accent-2) 0 54%, var(--vinyl) 55% 60%, var(--vinyl-groove) 61% 100%); }
.disc:nth-child(3) .disc__label { background: radial-gradient(circle, var(--accent-3) 0 54%, var(--vinyl) 55% 60%, var(--vinyl-groove) 61% 100%); }
.disc:nth-child(4) .disc__label { background: radial-gradient(circle, var(--focus-ring) 0 54%, var(--vinyl) 55% 60%, var(--vinyl-groove) 61% 100%); }
.disc__title { min-width: 0; color: var(--text); }
@media (min-width: 64rem) {
  .discs { grid-template-columns: repeat(5, minmax(0, 1fr)); }
  .disc {
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-4);
    border-radius: var(--radius);
  }
}

/* The number sits on the label colour; keep it readable by hiding the spindle hole behind it. */
.disc__label { text-shadow: none; font-size: 1.125rem; }

:root[data-motion="full"]:not([data-calm="on"]) .disc__label {
  transition: rotate var(--dur-slow) var(--ease-out);
}
:root[data-motion="full"]:not([data-calm="on"]) .disc:hover .disc__label { rotate: 30deg; }

:root[data-calm="on"] .b-side__backdrop { opacity: .5; }
:root[data-contrast="high"] .b-side__disc { opacity: .2; }
:root[data-contrast="high"] .eq__bar > span,
:root[data-contrast="high"] .b-side__eq-block[data-genre] .eq__bar > span { background: var(--accent-2); }
:root[data-contrast="high"] .eq__wave { display: none; }
:root[data-contrast="high"] .b-side__eq-block,
:root[data-contrast="high"] .b-side__eq-block[data-genre],
:root[data-contrast="high"] .lesson { background: var(--surface); }

/* Desert island discs link out to Spotify. The whole card is the target; the link text stays the accessible name. */
.disc { position: relative; transition: border-color var(--dur-fast) var(--ease-out), background-color var(--dur-fast) var(--ease-out); }
.disc__link {
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: var(--accent-2);
  text-decoration-thickness: 2px;
  text-underline-offset: .2em;
}
.disc__link::after { content: ""; position: absolute; inset: 0; border-radius: inherit; }
.disc__link:focus-visible { outline: none; }
.disc:has(.disc__link:focus-visible) { outline: 3px solid var(--focus-ring); outline-offset: 3px; }
.disc:hover, .disc:has(.disc__link:focus-visible) { border-color: var(--accent-2); background: var(--surface-2); }
.disc__icon { display: inline-block; width: .9em; height: .9em; margin-left: .35em; vertical-align: -.05em; color: var(--accent-2); }
:root[data-motion="full"]:not([data-calm="on"]) .disc:hover .disc__label,
:root[data-motion="full"]:not([data-calm="on"]) .disc:has(.disc__link:focus-visible) .disc__label {
  animation: disc-spin 1.8s linear infinite;
}
@keyframes disc-spin { to { rotate: 360deg; } }