/* ==========================================================================
   Page · K06 Motion
   All demos are plain CSS transitions on the motion tokens (--takt,
   --t-90 … --t-1200, --ease-*). k06-motion.js only toggles state classes
   (.is-run, .is-open, .is-reset, .is-pop) and custom properties
   (--step, --digit). Under prefers-reduced-motion base.css zeroes every
   transition, so the demos jump straight to their end state.
   ========================================================================== */

/* ---- Intro -------------------------------------------------------------- */

.lead--spaced {
  margin-bottom: 28px;
}

.motion-control {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.motion-control__btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: var(--target);
  padding: 0 18px;
  border: 1.5px solid var(--ink);
  background: transparent;
  color: var(--ink);
  font: 600 14px/1 var(--f-text);
  text-transform: uppercase;
  letter-spacing: .05em;
  cursor: pointer;
}

.motion-control__note {
  font: 400 13px/1.4 var(--f-mono);
  color: var(--muted);
}

/* ---- ST 010 · Easing tracks -------------------------------------------- */

.run-btn {
  min-height: var(--target);
  padding: 0 20px;
  border: 0;
  background: var(--action);
  color: var(--action-ink);
  font: 600 14px/1 var(--f-text);
  text-transform: uppercase;
  letter-spacing: .05em;
  clip-path: var(--chamfer-s);
  cursor: pointer;
}

.run-btn:active {
  transform: scale(.97);
}

.ease-list {
  display: grid;
  gap: 20px;
}

.ease-row {
  display: grid;
  grid-template-columns: minmax(140px, 220px) minmax(0, 1fr);
  gap: 16px;
  align-items: center;
}

.ease-row__name {
  font: 700 24px/1 var(--f-display);
  text-transform: uppercase;
}

.ease-row__meta {
  font: 400 12px/1.5 var(--f-mono);
  color: var(--ink-2);
}

/* --ease / --dur are set per row in the HTML */
.ease-track {
  position: relative;
  height: 48px;
  background: var(--surface);
  border: 1px solid var(--line);
}

/* the lane is one block narrower than the track, so 100% = end stop */
.ease-track__lane {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: calc(100% - 48px);
}

.ease-track__mover {
  width: 100%;
  height: 100%;
  transition-property: transform;
  transition-duration: var(--dur);
  transition-timing-function: var(--ease);
  transform: translateX(0);
}

.ease-list.is-run .ease-track__mover {
  transform: translateX(100%);
}

.ease-track__block {
  width: 48px;
  height: 46px;
  background: var(--ink);
  clip-path: var(--chamfer-s);
}

.durations {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1px;
  margin: 32px 0 0;
  background: var(--line-strong);
  border: 1px solid var(--line-strong);
  font: 400 13px/1.4 var(--f-mono);
}

.durations__item {
  padding: 14px;
  background: var(--canvas);
}

.durations__item dd {
  margin: 0;
}

.durations__ms {
  font: 700 28px/1 var(--f-display);
}

/* ---- ST 020 · Demo cards ----------------------------------------------- */

.demo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 380px), 1fr));
  gap: 16px;
}

.motion-demo {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 20px;
  background: var(--canvas);
  border: 1px solid var(--line-strong);
}

.motion-demo__head {
  display: flex;
  justify-content: space-between;
  font: 500 12px/1 var(--f-mono);
  color: var(--ink-2);
}

.motion-demo__head--center {
  align-items: center;
}

.motion-demo__btn {
  min-height: 32px;
  padding: 0 10px;
  border: 1px solid var(--line-strong);
  background: none;
  color: var(--ink);
  font: 500 12px/1 var(--f-mono);
  cursor: pointer;
}

.motion-demo__text {
  margin: 0;
  font-size: 14px;
  color: var(--ink-2);
}

/* ---- M.01 · Carrier indexing ------------------------------------------- */

.indexer {
  position: relative;
  height: 72px;
}

.indexer__rail {
  position: absolute;
  left: 12px;
  right: 12px;
  top: 35px;
  height: 1px;
  background: var(--line-strong);
}

/* --pos: 0 … 1 along the rail */
.indexer__tick,
.indexer__station {
  position: absolute;
  left: calc(12px + (100% - 24px) * var(--pos));
}

.indexer__tick {
  top: 29px;
  width: 1px;
  height: 13px;
  background: var(--ink);
}

.indexer__station {
  top: 52px;
  font: 400 10px/1 var(--f-mono);
  color: var(--muted);
  transform: translateX(-50%);
}

.indexer__track {
  position: absolute;
  left: 12px;
  right: 12px;
  top: 18px;
  height: 30px;
}

/* --step: 0 … 4, one station = 25 % of the track */
.indexer__mover {
  width: 100%;
  height: 100%;
  transition: transform var(--takt) var(--ease-servo);
  transform: translateX(calc(var(--step) * 25%));
}

.indexer__carrier {
  position: relative;
  width: 22px;
  height: 30px;
  margin-left: -11px;
  background: var(--ink);
  clip-path: polygon(5px 0, 100% 0, 100% calc(100% - 5px), calc(100% - 5px) 100%, 0 100%, 0 5px);
}

.indexer__carrier::after {
  content: "";
  position: absolute;
  left: 8px;
  top: 7px;
  width: 6px;
  height: 6px;
  background: var(--accent);
}

/* ---- M.02 · Production counter ----------------------------------------- */

.counter {
  display: flex;
  gap: 4px;
}

.counter__wheel {
  position: relative;
  width: 52px;
  height: 72px;
  overflow: hidden;
  background: var(--ink);
  color: var(--canvas);
}

/* numerals 0–9 stacked 72px apart; --digit picks the visible one */
.counter__strip {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  font: 700 48px/72px var(--f-display);
  text-align: center;
  transition: transform var(--t-180) var(--ease-index);
  transform: translateY(calc(var(--digit) * -72px));
}

/* ---- M.03 · Hall door --------------------------------------------------- */

.hall-door {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 160px;
  overflow: hidden;
  background: var(--canvas);
  color: var(--ink);
}

.hall-door__chapter {
  font: 800 44px/.9 var(--f-display);
  text-transform: uppercase;
  text-align: center;
}

.hall-door__accent {
  color: var(--accent-text);
}

.hall-door__slats {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
}

/* closing: top-down in 40 ms steps · opening: bottom-up in 70 ms steps */
.hall-door__slat {
  flex: 1;
  background: linear-gradient(#3A4146, #2C3237 70%, #1E2226);
  border-bottom: 1px solid #15181A;
  transform-origin: top;
  transition: transform var(--t-300) var(--ease-servo);
  transition-delay: calc(var(--i) * 40ms);
  transform: scaleY(1);
}

.hall-door.is-open .hall-door__slat {
  transition-delay: calc((7 - var(--i)) * 70ms);
  transform: scaleY(0);
}

/* ---- M.04 · Quantized stagger ------------------------------------------ */

.stagger {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
}

.stagger__tile {
  display: flex;
  align-items: flex-end;
  height: 56px;
  padding: 6px;
  background: var(--panel);
  clip-path: var(--chamfer-s);
  font: 500 10px/1 var(--f-mono);
  color: var(--ink-2);
  transition: transform var(--t-180) var(--ease-servo), opacity var(--t-90) linear;
  transition-delay: calc(var(--i) * 90ms);
  opacity: 1;
  transform: translateY(0);
}

/* .is-reset is set for 60 ms by REPLAY, then removed to play again */
.stagger.is-reset .stagger__tile {
  transition-delay: 0ms;
  opacity: 0;
  transform: translateY(12px);
}

/* ---- M.05 · State timeline fill ---------------------------------------- */

.fill-timeline {
  display: flex;
  height: 28px;
  gap: 1px;
}

.fill-timeline__seg {
  flex-grow: var(--f);
  transform-origin: left;
  transition: transform var(--t-300) var(--ease-index);
  transition-delay: calc(var(--i) * 90ms);
  transform: scaleX(1);
}

.fill-timeline.is-reset .fill-timeline__seg {
  transition-delay: 0ms;
  transform: scaleX(0);
}

.fill-timeline__seg--run   { background: var(--sig-green); }
.fill-timeline__seg--warn  { background: var(--sig-yellow); }
.fill-timeline__seg--fault { background: var(--sig-red); }

/* ---- M.06 · Press ------------------------------------------------------- */

.press-demo {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.press-demo__btn {
  min-height: 56px;
  padding: 0 24px;
  border: 0;
  background: var(--action);
  color: var(--action-ink);
  font: 600 15px/1 var(--f-text);
  text-transform: uppercase;
  letter-spacing: .05em;
  clip-path: var(--chamfer-s);
  cursor: pointer;
  transition: transform var(--t-90) var(--ease-press);
}

.press-demo__btn:active {
  transform: translateY(2px) scale(.96);
}

.press-demo__basket {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font: 500 14px/1 var(--f-mono);
}

.press-demo__badge {
  display: inline-block;
  padding: 5px 8px;
  background: var(--ink);
  color: var(--canvas);
  transition: transform var(--t-180) var(--ease-press);
  transform: scale(1);
}

.press-demo__badge.is-pop {
  transform: scale(1.35);
}

/* ---- ST 030 · Motion budget -------------------------------------------- */

.budget-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
  gap: 16px;
}

.budget {
  padding-top: 16px;
  border-top: 4px solid var(--budget-color);
}

.budget--expressive { --budget-color: var(--ink); }
.budget--calm       { --budget-color: var(--ink-2); }
.budget--functional { --budget-color: var(--panel); }

.budget__title {
  margin-bottom: 8px;
  font: 700 28px/1 var(--f-display);
  text-transform: uppercase;
}

.budget__text {
  margin: 0;
  font-size: var(--fs-small);
  color: var(--ink-2);
}

.motion-rules {
  margin: 40px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1.5px solid var(--ink);
}

.motion-rules__rule {
  display: grid;
  grid-template-columns: 48px 1fr;
  padding: 14px 0;
  border-bottom: 1px solid var(--line-strong);
}

.motion-rules__code {
  font: 500 13px var(--f-mono);
  color: var(--muted);
}