:root {
  --clay: #d97757;
  --clay-deep: #c15f3c;
  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  color-scheme: dark;
}

body[data-tone="dark"] {
  --cap: #efe8dc;
  --cap-shadow: 0 1px 18px rgba(0, 0, 0, 0.7);
  --ui: rgba(240, 234, 222, 0.78);
  --ui-faint: rgba(240, 234, 222, 0.18);
  --ui-bg: rgba(20, 18, 16, 0.55);
}

body[data-tone="light"] {
  --cap: #2b2825;
  --cap-shadow: 0 1px 14px rgba(244, 241, 233, 0.9);
  --ui: rgba(43, 40, 37, 0.75);
  --ui-faint: rgba(43, 40, 37, 0.15);
  --ui-bg: rgba(255, 253, 248, 0.6);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  background: #0c0b0a;
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}

#stage {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.home {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 5;
  font-size: 13px;
  color: var(--ui);
  text-decoration: none;
  opacity: 0.7;
  transition: opacity 0.2s, color 1s;
}
.home:hover {
  opacity: 1;
}

.caption {
  position: fixed;
  left: 50%;
  bottom: calc(82px + env(safe-area-inset-bottom));
  transform: translateX(-50%);
  width: min(calc(100vw - 32px), 760px);
  margin: 0;
  text-align: center;
  font-family: var(--serif);
  font-size: clamp(19px, 2.3vw, 28px);
  line-height: 1.35;
  color: var(--cap);
  text-shadow: var(--cap-shadow);
  text-wrap: balance;
  opacity: 0;
  pointer-events: none;
  transition: color 1.2s;
  z-index: 2;
}

/* intro and ending */
.overlay {
  position: fixed;
  inset: 0;
  z-index: 10;
  display: grid;
  place-items: center;
  padding: 16px;
  background: radial-gradient(ellipse at center, rgba(12, 11, 10, 0.9) 0%, rgba(12, 11, 10, 0.78) 45%, rgba(12, 11, 10, 0.55) 100%);
  transition: opacity 0.9s ease;
}
.overlay.hidden {
  opacity: 0;
  pointer-events: none;
}
.overlay.end {
  background: radial-gradient(ellipse at center, rgba(244, 241, 233, 0.35), rgba(244, 241, 233, 0.85));
}

.panel {
  text-align: center;
  max-width: 460px;
  color: #efe8dc;
}
.end .panel {
  color: #2b2825;
}
.mark {
  display: block;
  margin: 0 auto 18px;
  border-radius: 14px;
}
.panel h1,
.panel h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(34px, 6vw, 52px);
  line-height: 1.1;
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}
.panel h2 {
  font-size: clamp(28px, 5vw, 42px);
  margin-bottom: 22px;
}
.lede {
  font-family: var(--serif);
  font-style: italic;
  font-size: 19px;
  line-height: 1.45;
  margin: 0 0 28px;
  opacity: 0.85;
}
.note {
  font-size: 13px;
  opacity: 0.6;
  margin: 18px 0 0;
}
.row {
  display: flex;
  gap: 14px;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

.primary {
  font: 500 16px var(--sans);
  color: #fff;
  background: var(--clay);
  border: 0;
  border-radius: 999px;
  padding: 13px 34px;
  cursor: pointer;
  box-shadow: 0 6px 24px rgba(217, 119, 87, 0.35);
  transition: background 0.2s, transform 0.2s;
}
.primary:hover {
  background: var(--clay-deep);
  transform: translateY(-1px);
}
.primary:focus-visible,
.icon-btn:focus-visible,
.secondary:focus-visible {
  outline: 2px solid var(--clay);
  outline-offset: 3px;
}
.secondary {
  font: 500 15px var(--sans);
  color: #2b2825;
  text-decoration: none;
  padding: 12px 18px;
  border-radius: 999px;
}
.secondary:hover {
  background: rgba(43, 40, 37, 0.07);
}

/* playback controls */
.controls {
  position: fixed;
  left: 16px;
  right: 16px;
  bottom: calc(16px + env(safe-area-inset-bottom));
  z-index: 4;
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 860px;
  margin: 0 auto;
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--ui-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--ui);
  transition: opacity 0.6s, background 1s, color 1s;
}
.controls.hidden {
  display: none;
}
.controls.idle {
  opacity: 0;
}
.controls.idle:hover,
.controls.idle:focus-within {
  opacity: 1;
}

.icon-btn {
  flex: none;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: inherit;
  cursor: pointer;
}
.icon-btn svg {
  fill: currentColor;
}
.icon-btn:hover {
  background: var(--ui-faint);
}
#play .i-play,
#play.paused .i-pause,
#mute .i-off,
#mute.muted .i-on {
  display: none;
}
#play.paused .i-play,
#mute.muted .i-off {
  display: block;
}

.bar {
  position: relative;
  flex: 1;
  height: 22px;
  cursor: pointer;
  touch-action: none;
}
.bar::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 10px;
  height: 2px;
  border-radius: 2px;
  background: var(--ui-faint);
}
.fill {
  position: absolute;
  left: 0;
  top: 10px;
  height: 2px;
  border-radius: 2px;
  background: var(--clay);
  width: 0;
}
.tick {
  position: absolute;
  top: 7px;
  width: 2px;
  height: 8px;
  margin-left: -1px;
  border-radius: 1px;
  background: var(--ui);
  opacity: 0.45;
}
.chap {
  flex: none;
  font-size: 12.5px;
  font-variant-numeric: tabular-nums;
  min-width: 118px;
  text-align: right;
}

@media (max-width: 560px) {
  .chap {
    min-width: 0;
    font-size: 11.5px;
  }
  .caption {
    bottom: calc(74px + env(safe-area-inset-bottom));
  }
}