/* explainer.css — the animated-explainer player. Every value comes from DESIGN.md.
   Tokens fall back to the design hexes so the player also renders without site.css. */

.xp {
  --xp-paper: var(--paper, #EFE1C4);
  --xp-paper-deep: var(--paper-deep, #E6D5B2);
  --xp-paper-light: var(--paper-light, #FBF6EC);
  --xp-ink: var(--ink, #2E302F);
  --xp-ink-soft: var(--ink-soft, #5B5A52);
  --xp-ochre: var(--ochre, #C29434);
  --xp-ochre-hover: var(--ochre-hover, #CDA24A);
  --xp-ochre-light: var(--ochre-light, #E2B966);
  --xp-teal: var(--teal, #2F6161);
  --xp-teal-deep: var(--teal-deep, #1F4545);
  --xp-rule: var(--rule, #D3C3A2);
  --xp-radius: var(--radius, 2px);
  --xp-display: var(--f-display, "Inter Display", system-ui, sans-serif);
  --xp-body: var(--f-body, "Source Serif 4", Georgia, serif);
  --xp-mono: var(--f-mono, "Source Code Pro", ui-monospace, Menlo, monospace);
  --xp-ease: cubic-bezier(.65, 0, .35, 1);
  --xp-ease-out: cubic-bezier(.16, 1, .3, 1);
  position: relative;
  width: 100%;
  color: var(--xp-ink);
}

.xp__frame {
  display: flex; flex-direction: column;
  background: var(--xp-paper-light);
  border: 1px solid var(--xp-rule);
  outline: none;
}
.xp__frame:focus-visible { outline: 3px solid var(--xp-teal); outline-offset: 3px; }

/* ----------------------------------------------------------- the stage */
.xp__viewport {
  position: relative; width: 100%; aspect-ratio: 16 / 9;
  overflow: hidden; background: var(--xp-paper-light);
  cursor: default; -webkit-tap-highlight-color: transparent;
}
.xp__frame.is-started .xp__viewport { cursor: pointer; }
.xp__stage {
  --rt: 1s;
  /* Fades and wipes follow the beat's transition time but never run longer than
     --xp-fade-max, so a long continuous beat (a 14 s animation) doesn't stretch
     its text fades to 14 s. A deck can override the cap on its stage. */
  --xp-fade-max: 2.4s;
  --rtc: min(var(--rt), var(--xp-fade-max));
  position: absolute; left: 0; top: 0; width: 1600px; height: 900px;
  transform-origin: 0 0; overflow: hidden;
  font-family: var(--xp-body); color: var(--xp-ink);
  -webkit-font-smoothing: antialiased;
}
.xp__layer { position: absolute; left: 0; top: 0; width: 1600px; height: 900px; overflow: visible; }
.xp__labs { position: absolute; inset: 0; pointer-events: none; z-index: 5; }
.xp__lab { position: absolute; white-space: nowrap; pointer-events: none; font: 400 17px/1.2 var(--xp-mono); letter-spacing: .02em; will-change: transform, opacity; }

/* --------------------------------------------- stage text primitives */
.xp__stage .el { position: absolute; }
.xp__stage .fade { opacity: 0; transform: translateY(10px); transition: opacity var(--rtc) var(--xp-ease), transform var(--rtc) var(--xp-ease); }
.xp__stage .fade.on { opacity: 1; transform: none; }
.xp__stage .write { opacity: 0; clip-path: inset(-30px 100% -30px -30px); transition: opacity calc(var(--rtc) * .6) ease, clip-path 0s linear var(--rtc); }
.xp__stage .write.on { opacity: 1; clip-path: inset(-30px -30px -30px -30px); transition: opacity .25s ease, clip-path var(--rtc) var(--xp-ease); }
.xp__stage .draw { stroke-dasharray: 1; stroke-dashoffset: 1; opacity: 0; transition: opacity calc(var(--rtc) * .6) ease, stroke-dashoffset 0s linear var(--rtc); }
.xp__stage .draw.on { stroke-dashoffset: 0; opacity: 1; transition: stroke-dashoffset var(--rtc) var(--xp-ease), opacity .15s; }
.xp__stage .sfade { opacity: 0; transition: opacity var(--rtc) var(--xp-ease); }
.xp__stage .sfade.on { opacity: 1; }
.xp__stage.xp--instant, .xp__stage.xp--instant * { transition: none !important; }

/* type on the 1600×900 canvas (px are canvas units, scaled with the stage) */
.xp__stage .xp-kicker { font: 400 18px/1.4 var(--xp-mono); letter-spacing: .02em; color: var(--xp-ink-soft); }
.xp__stage .xp-title { font: 800 92px/.95 var(--xp-display); letter-spacing: -0.035em; color: var(--xp-ink); text-wrap: balance; }
.xp__stage .xp-sub { font: 400 30px/1.35 var(--xp-body); color: var(--xp-ink-soft); }
.xp__stage .xp-h { font: 800 46px/1 var(--xp-display); letter-spacing: -0.035em; color: var(--xp-ink); }
.xp__stage .xp-tx { font: 400 26px/1.45 var(--xp-body); color: var(--xp-ink); text-wrap: pretty; }
.xp__stage .xp-tx b, .xp__stage .xp-tx strong { font-weight: 600; color: var(--xp-teal); }
.xp__stage .xp-tx em { font-style: italic; }
.xp__stage .xp-tx code, .xp__stage .xp-code { font-family: var(--xp-mono); letter-spacing: .01em; }
.xp__stage .xp-tx code { font-size: .86em; background: var(--xp-paper-deep); padding: 0 .3em; border-radius: var(--xp-radius); }
.xp__stage .xp-small { font: 400 18px/1.45 var(--xp-mono); letter-spacing: .02em; color: var(--xp-ink-soft); }
.xp__stage .xp-code { font-size: 21px; line-height: 1.5; color: var(--xp-ink); white-space: pre; margin: 0; }
.xp__stage .xp-code b { font-weight: 400; color: var(--xp-teal); }
.xp__stage .xp-code i { font-style: normal; color: var(--xp-ink-soft); }
.xp__stage .xp-card { background: var(--xp-paper-light); border: 1px solid var(--xp-rule); }
.xp__stage .xp-card--lead { border: 1.5px solid var(--xp-ink); }

/* -------------------------------------------------------------- poster */
.xp__poster {
  position: absolute; inset: 0; z-index: 10;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 14px;
  width: 100%; border: 0; padding: 24px; margin: 0;
  background: color-mix(in srgb, var(--xp-paper) 35%, transparent);
  color: var(--xp-ink); font-family: var(--xp-display); cursor: pointer;
  transition: opacity .25s var(--xp-ease), visibility 0s .25s;
}
@supports not (background: color-mix(in srgb, red 50%, transparent)) { .xp__poster { background: rgba(239, 225, 196, .35); } }
.xp__frame.is-started:not(.is-ended) .xp__poster { opacity: 0; visibility: hidden; pointer-events: none; }
/* a deep link shows the seeked frame: no big centered overlay, just a small corner play button */
.xp__frame.is-deeplinked:not(.is-ended) .xp__poster { background: transparent; align-items: flex-start; justify-content: flex-end; padding: clamp(10px, 2.5%, 24px); }
.xp__frame.is-deeplinked:not(.is-ended) .xp__poster-icon { width: clamp(40px, 5.5%, 60px); }
.xp__poster:focus-visible { outline: 3px solid var(--xp-teal); outline-offset: -6px; }
.xp__poster-icon {
  display: grid; place-items: center; width: clamp(64px, 12%, 104px); aspect-ratio: 1;
  background: var(--xp-ochre); color: var(--xp-ink);
  border: 1.5px solid var(--xp-ink); border-radius: var(--xp-radius);
  transition: background-color .15s var(--xp-ease), transform .08s;
}
.xp__poster-icon svg { width: 46%; height: 46%; }
.xp__poster:hover .xp__poster-icon { background: var(--xp-ochre-hover); box-shadow: inset 0 0 0 1px var(--xp-ink); }
.xp__poster:active .xp__poster-icon { transform: translateY(1px); }
.xp__poster-meta { font: 400 .8125rem/1.4 var(--xp-mono); letter-spacing: .02em; color: var(--xp-ink); text-align: center; }
.xp__frame.is-ended .xp__poster { background: color-mix(in srgb, var(--xp-paper) 70%, transparent); }
.xp__frame.is-deeplinked:not(.is-ended) .xp__poster-meta { display: none; }

/* ----------------------------------------------------------- controls */
.xp__ctrl {
  display: flex; align-items: center; gap: 4px;
  padding: 6px 8px; border-top: 1px solid var(--xp-rule);
  background: var(--xp-paper-light); font-family: var(--xp-mono);
  transition: opacity .3s var(--xp-ease), transform .3s var(--xp-ease);
}
.xp__btn {
  flex: none; display: grid; place-items: center; min-width: 44px; min-height: 44px;
  padding: 0 6px; border: 0; border-radius: var(--xp-radius);
  background: transparent; color: var(--xp-ink); cursor: pointer;
  font: 400 .8125rem/1 var(--xp-mono); letter-spacing: .02em;
  transition: background-color .15s var(--xp-ease);
}
.xp__btn svg { display: block; }
@media (hover: hover) { .xp__btn:hover { background: var(--xp-paper-deep); } }
.xp__btn:active { transform: translateY(1px); }
.xp__btn:focus-visible { outline: 3px solid var(--xp-teal); outline-offset: -3px; }
.xp__btn[data-act="play"] { background: var(--xp-ochre); border: 1.5px solid var(--xp-ink); }
@media (hover: hover) { .xp__btn[data-act="play"]:hover { background: var(--xp-ochre-hover); box-shadow: inset 0 0 0 1px var(--xp-ink); } }
.xp__btn--speed { min-width: 52px; font-variant-numeric: tabular-nums; }

.xp__bar { position: relative; flex: 1; min-width: 80px; height: 44px; cursor: pointer; touch-action: none; border-radius: var(--xp-radius); }
.xp__bar:focus-visible { outline: 3px solid var(--xp-teal); outline-offset: -3px; }
.xp__track { position: absolute; left: 8px; right: 8px; top: 12px; height: 4px; background: var(--xp-rule); overflow: hidden; }
.xp__fill { height: 100%; width: 0; background: var(--xp-teal); }
.xp__frame.is-scrubbing .xp__fill { background: var(--xp-ochre); }
.xp__tick { position: absolute; top: 10px; width: 2px; height: 8px; margin-left: 7px; background: var(--xp-paper-light); pointer-events: none; }
.xp__chap { position: absolute; left: 8px; right: 8px; bottom: 5px; font: 400 .8125rem/1.3 var(--xp-mono); letter-spacing: .02em; color: var(--xp-ink-soft); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; pointer-events: none; }
.xp__time { flex: none; padding: 0 6px; font: 400 .8125rem/1 var(--xp-mono); letter-spacing: .02em; font-variant-numeric: tabular-nums; color: var(--xp-ink-soft); white-space: nowrap; }

@media (max-width: 560px) {
  .xp__ctrl { flex-wrap: wrap; gap: 0; padding: 4px 6px 6px; }
  .xp__bar { order: -1; flex-basis: 100%; }
  .xp__btn { padding: 0 4px; }
  .xp__btn--speed { min-width: 44px; }
  .xp__time { margin-left: auto; padding: 0 4px; }
  .xp__time-total { display: none; }
}

/* --------------------------------------------------------- fullscreen */
.xp__frame.is-fs { width: 100%; height: 100%; border: 0; background: var(--xp-ink); }
.xp__frame.is-fs .xp__viewport { flex: 1; min-height: 0; aspect-ratio: auto; background: var(--xp-ink); }
.xp__frame.is-fs .xp__ctrl { position: absolute; left: 0; right: 0; bottom: 0; border-top: 0; padding: 10px 16px calc(10px + env(safe-area-inset-bottom)); background: color-mix(in srgb, var(--xp-paper-light) 94%, transparent); }
.xp__frame.is-fs.is-idle .xp__ctrl { opacity: 0; transform: translateY(8px); pointer-events: none; }
.xp__frame.is-fs.is-idle .xp__viewport { cursor: none; }

/* ------------------------------------------------------ reduced motion */
@media (prefers-reduced-motion: reduce) {
  .xp__stage, .xp__stage *, .xp__poster, .xp__ctrl, .xp__btn { transition: none !important; animation: none !important; }
}
.xp__frame.is-reduced .xp__stage, .xp__frame.is-reduced .xp__stage * { transition: none !important; animation: none !important; }

/* ---------------------------------------------------------- transcript */
.xp-transcript { list-style: none; margin: 0; padding: 0; border-top: 1.5px solid var(--ink, #2E302F); }
.xp-transcript li { border-bottom: 1px solid var(--rule, #D3C3A2); }
.xp-transcript button {
  display: grid; grid-template-columns: 4.5em 1fr; gap: 0 16px; align-items: baseline;
  width: 100%; min-height: 44px; padding: 14px 8px; margin: 0; text-align: left;
  border: 0; border-radius: var(--radius, 2px); background: transparent; color: inherit; cursor: pointer;
  font: 400 1.0625rem/1.55 var(--f-body, "Source Serif 4", Georgia, serif);
}
.xp-transcript button:focus-visible { outline: 3px solid var(--teal, #2F6161); outline-offset: -3px; }
@media (hover: hover) { .xp-transcript button:hover { background: var(--paper-light, #FBF6EC); } }
.xp-transcript time { font: 400 .8125rem/1.4 var(--f-mono, "Source Code Pro", monospace); letter-spacing: .02em; color: var(--teal, #2F6161); font-variant-numeric: tabular-nums; }
.xp-transcript b { display: block; font: 700 .9375rem/1.3 var(--f-display, "Inter Display", system-ui, sans-serif); letter-spacing: -0.015em; margin-bottom: 4px; }
.xp-transcript li[aria-current="step"] button { background: var(--paper-light, #FBF6EC); box-shadow: inset 3px 0 0 var(--ochre, #C29434); }
@media (max-width: 560px) {
  .xp-transcript button { grid-template-columns: 1fr; gap: 2px; }
}

/* ------------------------------------------------------- explainer page */
.xp-page { padding-block: clamp(32px, 5vw, 64px) 0; }
.xp-keys { margin-top: 12px; }
.xp-noscript { padding: 32px; margin: 0; color: var(--ink-soft, #5B5A52); }
.xp-grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: var(--gutter, 24px); }
.xp-grid__side { grid-column: 1 / span 4; }
.xp-grid__side p { color: var(--ink-soft, #5B5A52); max-width: 36ch; }
.xp-grid__main { grid-column: 6 / span 7; }
.xp-transcript-section { padding-block: var(--section, clamp(96px, 14vw, 176px)) 0; }
.xp-cta { padding-block: var(--section, clamp(96px, 14vw, 176px)); }
.xp-cta__card { padding: 32px; background: var(--paper-light, #FBF6EC); border: 1.5px solid var(--ink, #2E302F); max-width: 720px; }
.xp-cta__card h2 { font-size: clamp(1.75rem, 3.4vw, 2.6rem); margin: 8px 0 16px; }
.xp-cta__card p:not(.label) { color: var(--ink-soft, #5B5A52); max-width: 56ch; }
.xp-cta__actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.xp-faq { padding-block: 0 var(--section, clamp(96px, 14vw, 176px)); }
.xp-faq__list { margin: 0; border-top: 1.5px solid var(--ink, #2E302F); }
.xp-faq__list dt { font: 700 1.125rem/1.35 var(--f-display, "Inter Display", system-ui, sans-serif); letter-spacing: -0.01em; padding-top: 20px; }
.xp-faq__list dd { margin: 8px 0 0; padding-bottom: 20px; border-bottom: 1px solid var(--rule, #D3C3A2); color: var(--ink-soft, #5B5A52); max-width: 60ch; }
.xp-video { padding-bottom: var(--section, clamp(96px, 14vw, 176px)); }
@media (max-width: 860px) {
  .xp-grid__side, .xp-grid__main { grid-column: 1 / -1; }
  .xp-grid__side { margin-bottom: 24px; }
}

/* Explainer pages: the player is the point, so the header stays compact and the stage
   starts above the fold on a laptop screen. */
.page-explainer .page-head { padding-block: clamp(28px, 4vw, 48px) clamp(20px, 2.5vw, 28px); }
.page-explainer .page-head h1 { font-size: clamp(2.2rem, 4.6vw, 3.6rem); margin: 8px 0 12px; }
.page-explainer .page-head p:not(.label):not(.crumbs) { font-size: 1.125rem; }
.page-explainer .xp-page { padding-block: clamp(20px, 3vw, 36px) 0; }
.xp-lede { max-width: 64ch; margin: 20px 0 0; font-size: 1.1875rem; color: var(--ink-soft); }
.page-explainer .xp { max-width: min(100%, calc((100svh - 150px) * 16 / 9)); margin-inline: auto; }