/* =========================================================
   地熱劇場：硫霧、沸土與一束光
   Palette, type and layout follow CONCEPT.md.
   ========================================================= */

:root {
  /* material palette */
  --cave: #07050a;
  --cave-2: #0d0a0f;
  --mantle: #1a0508;
  --ember: #3a0f0a;
  --sulfur: #d6c45a;
  --sulfur-2: #c4b24a;
  --steam: #8aa0a8;
  --magma: #e85d04;
  --magma-2: #dc2f02;
  --cue: #ff2d6a;            /* only the instant a light comes on */

  --bone: #e8e2d4;           /* body text, warm like lamp-lit paper */
  --dim: #bdb7aa;
  --faint: #a8a294;          /* small slates and captions, ~7.5:1 on cave */
  --hair: rgba(232, 226, 212, .12);
  --hair-2: rgba(232, 226, 212, .22);

  --serif: "Noto Serif TC", "Songti TC", serif;
  --hand: "LXGW WenKai TC", "Noto Serif TC", serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;

  /* golden split */
  --major: 61.8%;
  --minor: 38.2%;
  --gut: clamp(1.25rem, 4.2vw, 4.5rem);
  --sect: clamp(7rem, 18vh, 13rem);

  --ease: cubic-bezier(.22, .68, .16, 1);     /* long, soft settle; no overshoot */
  --ease-door: cubic-bezier(.65, 0, .25, 1);  /* the room door: slow in, slow out */

  --z-steam: 0;             /* under main (z 1): fog never covers works or text */
  --z-grain: 3;
  --z-bar: 10;
}

/* ===== Base ===== */
*, *::before, *::after { box-sizing: border-box; }
html { overflow-x: clip; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; overflow-x: clip;
  background: var(--cave); color: var(--bone);
  font: 400 1.0625rem/1.95 var(--serif);
  letter-spacing: .03em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, iframe { display: block; max-width: 100%; }
img { height: auto; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, p, ul, ol, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
button, input, select, textarea { font: inherit; color: inherit; letter-spacing: inherit; }
:focus-visible { outline: 1px solid var(--sulfur); outline-offset: 5px; }
::selection { background: var(--sulfur); color: var(--cave); }

.slate {
  font: 400 .78rem/1.5 var(--mono);
  letter-spacing: .1em;
  color: var(--faint);
}

.skip-link {
  position: absolute; left: var(--gut); top: -5rem; z-index: 20;
  padding: .7rem 1.1rem; background: var(--bone); color: var(--cave);
}
.skip-link:focus { top: 1rem; }
.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }

/* ===== Atmosphere: steam canvas + grain (fixed, never scrolling) ===== */
.steam {
  position: fixed; inset: 0; z-index: var(--z-steam);
  width: 100%; height: 100%;
  pointer-events: none;
}
.grain {
  position: fixed; inset: -50%; z-index: var(--z-grain);
  pointer-events: none;
  opacity: .055;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .5 0 0 0 0 .5 0 0 0 0 .5 0 0 0 1 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  animation: grain 1.2s steps(6) infinite;
}
@keyframes grain {
  0%   { transform: translate(0, 0); }
  20%  { transform: translate(-3%, 2%); }
  40%  { transform: translate(2%, -4%); }
  60%  { transform: translate(-4%, -1%); }
  80%  { transform: translate(3%, 3%); }
  100% { transform: translate(0, 0); }
}
main, .foot { position: relative; z-index: 1; }

/* ===== Buttons ===== */
.door-btn {
  position: relative; isolation: isolate; overflow: hidden;
  display: inline-flex; align-items: center; justify-content: center;
  padding: 1rem 1.9rem;
  border: 1px solid rgba(214, 196, 90, .42); border-radius: 0;
  background: transparent; color: var(--sulfur);
  font: 500 .95rem/1 var(--serif); letter-spacing: .32em; text-indent: .32em;
  cursor: pointer;
  transition: color .6s var(--ease), border-color .6s var(--ease), transform .3s var(--ease);
}
.door-btn::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: var(--sulfur);
  transform: scaleX(0); transform-origin: left;
  transition: transform .7s var(--ease);
}
.door-btn:hover { color: var(--cave); border-color: var(--sulfur); }
.door-btn:hover::before { transform: scaleX(1); }
.door-btn:active { transform: scale(.98); }

/* ===== Bar (floating, detached) ===== */
.bar {
  position: fixed; z-index: var(--z-bar);
  top: clamp(1rem, 3vh, 2rem); left: var(--gut); right: var(--gut);
  display: flex; align-items: baseline; justify-content: space-between;
  pointer-events: none;
}
.bar > * { pointer-events: auto; }
.bar::before {
  content: ""; position: fixed; inset: 0 0 auto; height: 6.5rem; z-index: -1; pointer-events: none;
  background: linear-gradient(180deg, rgba(7, 5, 10, .92) 0%, rgba(7, 5, 10, .6) 50%, rgba(7, 5, 10, 0) 100%);
}
.bar__brand { font: 700 1rem/1 var(--serif); letter-spacing: .14em; }
.bar__menu { display: flex; gap: clamp(1.25rem, 2.6vw, 2.75rem); }
.bar__menu a {
  position: relative;
  font: 400 .9rem/1 var(--hand); letter-spacing: .18em; color: var(--dim);
  transition: color .5s var(--ease);
}
.bar__menu a::after {
  content: ""; position: absolute; left: 0; right: .18em; bottom: -.55em; height: 1px;
  background: currentColor; transform: scaleX(0); transform-origin: right;
  transition: transform .6s var(--ease);
}
.bar__menu a:hover { color: var(--bone); }
.bar__menu a:hover::after { transform: scaleX(1); transform-origin: left; }
.bar__menu .bar__door { color: var(--sulfur); }
.bar__toggle { display: none; }

/* ===== Overture ===== */
.overture {
  position: relative;
  min-height: 100dvh;
  display: grid;
  grid-template-columns: var(--minor) 1fr;
  grid-template-rows: 1fr auto auto;
  column-gap: var(--gut);
  padding: clamp(6rem, 15vh, 9rem) var(--gut) clamp(2.5rem, 6vh, 4rem);
  isolation: isolate;
}
.overture__cave { position: absolute; inset: 0; z-index: -1; overflow: hidden; }
.overture__cave img { width: 100%; height: 100%; object-fit: cover; }
/* the wipeable fog: over the picture, under the falloff (::before, z 1) so the title still sits on black */
.overture__fog { position: absolute; inset: 0; z-index: 0; width: 100%; height: 100%; pointer-events: none; will-change: transform; } /* own layer: a fog frame never repaints the picture */
/* the cave's own falloff toward the floor, so the title sits on black */
.overture__cave::before {
  content: ""; position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(180deg, rgba(7,5,10,.35) 0%, rgba(7,5,10,0) 30%, rgba(7,5,10,.55) 70%, var(--cave) 100%);
}

.overture__media {
  grid-column: 2; grid-row: 1;
  align-self: start; justify-self: end;
  width: min(100%, 50rem, calc((100dvh - 20rem) * 16 / 9));
}
.overture__cap { margin-top: 1.1rem; color: var(--bone); text-shadow: 0 1px 10px rgba(7, 5, 10, .8); }
.overture__screen {
  aspect-ratio: 16 / 9;
  background: var(--cave);
  outline: 1px solid var(--hair);
  outline-offset: 10px;     /* vitrine: a hairline shell held off the glass */
  box-shadow: 0 40px 120px -40px rgba(232, 93, 4, .22);
}
.overture__screen iframe { width: 100%; height: 100%; border: 0; }

/* click-to-load YouTube poster */
.yt__play { position: relative; display: block; width: 100%; height: 100%; padding: 0; border: 0; background: none; cursor: pointer; }
.yt__play img { width: 100%; height: 100%; object-fit: cover; }
.yt__icon {
  position: absolute; left: 50%; top: 50%; width: 4.5rem; height: 4.5rem; transform: translate(-50%, -50%);
  border: 1px solid rgba(232, 226, 212, .7); border-radius: 50%; background: rgba(7, 5, 10, .55);
  transition: background-color .4s var(--ease), border-color .4s var(--ease);
}
.yt__icon::after {
  content: ""; position: absolute; left: 54%; top: 50%; transform: translate(-50%, -50%);
  border-style: solid; border-width: .7rem 0 .7rem 1.15rem; border-color: transparent transparent transparent var(--bone);
}
.yt__play:hover .yt__icon, .yt__play:focus-visible .yt__icon { background: var(--sulfur); border-color: var(--sulfur); }
.yt__play:hover .yt__icon::after, .yt__play:focus-visible .yt__icon::after { border-left-color: var(--cave); }
.yt__out, .work__out, .room__out {
  color: var(--sulfur); border-bottom: 1px solid rgba(214, 196, 90, .4);
  transition: border-color .4s var(--ease);
}
.yt__out:hover, .work__out:hover, .room__out:hover { border-color: var(--sulfur); }

.overture__verse {
  grid-column: 1; grid-row: 1;
  justify-self: start; align-self: start;
  writing-mode: vertical-rl;
  font: 400 clamp(1.15rem, 1.6vw, 1.45rem)/1.6 var(--hand);
  letter-spacing: .5em;
  color: #f3ece0; text-shadow: 0 1px 6px rgba(0,0,0,.75);
  padding-top: .5rem;
}

.overture__mark {
  grid-column: 1 / -1; grid-row: 2;
  margin: clamp(1.5rem, 4vh, 3rem) 0 0 -0.06em;
  font: 900 clamp(4.5rem, 12.5vw, 13rem)/.86 var(--serif);
  letter-spacing: -.06em;
  color: var(--bone);
  pointer-events: none;
  display: flex; flex-wrap: wrap; column-gap: .18em; align-items: baseline;
}
/* Latin set a touch larger: CJK fills the em box, Latin caps only ~.66 of it */
.overture__mark span:nth-child(2) { font: 900 1.1em/.86 "Source Serif 4", var(--serif); font-variation-settings: "opsz" 60; letter-spacing: -.035em; }
.overture__mark { text-shadow: 0 2px 40px rgba(7, 5, 10, .55); }
/* the medium, set small against the name like a credit line on a poster */
.overture__mark small {
  flex-basis: 100%; margin: .45em 0 0 .06em;
  font: 700 clamp(1.6rem, 3.4vw, 3.4rem)/1 var(--serif); letter-spacing: .12em;
  color: var(--sulfur);
}

.overture__pitch {
  grid-column: 2; grid-row: 3;
  justify-self: end;
  width: min(100%, 25rem);
  margin-top: clamp(1.5rem, 4vh, 2.5rem);
  display: grid; gap: 1.6rem; justify-items: start;
}
.overture__pitch p { color: var(--dim); }
.overture__pitch .overture__forte {
  font: 700 clamp(1.35rem, 2vw, 1.75rem)/1.4 var(--serif); letter-spacing: .08em;
  color: var(--bone);
  margin-bottom: -.6rem;
}

.overture__awards {
  grid-column: 1; grid-row: 3;
  align-self: end;
  margin-top: 2rem;
}
.overture__awards ul { margin-top: 1rem; display: flex; flex-wrap: wrap; gap: 1.1rem 2.4rem; }
.overture__awards li {
  padding-left: 1rem; border-left: 1px solid rgba(214, 196, 90, .55);
  font: 400 .88rem/1.6 var(--hand); color: var(--sulfur); letter-spacing: .08em;
}
.overture__awards li span { display: block; font: 700 1.2rem/1.5 var(--serif); color: var(--bone); letter-spacing: .04em; }

/* pull-the-face figure; the canvas overhangs the image so a stretch is not clipped */
.yu {
  grid-column: 1; grid-row: 1;
  justify-self: end; align-self: start;
  width: clamp(12rem, 24vw, 22rem);
}
.yu__stage { position: relative; }
/* the stage (image-sized) takes the drag, so the canvas overhang still lets a finger scroll the page */
.yu__stage canvas {
  position: absolute; inset: -12%; width: 124%; height: 124%;
  pointer-events: none;
}
.yu.is-live .yu__stage { touch-action: none; cursor: grab; -webkit-user-select: none; user-select: none; }
.yu.is-live .yu__stage:active { cursor: grabbing; }
.yu.is-live img { opacity: 0; pointer-events: none; }
.yu figcaption { margin-top: .6rem; text-align: center; }

/* ===== Room walls (two hung works) ===== */
.room-wall {
  position: relative;
  padding: var(--sect) 0 calc(var(--sect) * .6);
}
.room-wall__no {
  position: absolute; top: calc(var(--sect) * .55);
  left: var(--gut);
}
.work {
  display: grid;
  grid-template-columns: var(--major) 1fr;
  grid-template-rows: auto 1fr;
  column-gap: clamp(2rem, 5vw, 5.5rem);
}
.work__dark {
  grid-row: 1 / -1;
  align-self: start;   /* a stretched row must not stretch the frame past 16:9 */
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--cave-2);
  cursor: zoom-in;
}
.work__dark img { width: 100%; height: 100%; object-fit: cover; }
.work__title {
  font: 900 clamp(2.8rem, 6.4vw, 6.4rem)/1 var(--serif);
  letter-spacing: -.02em;
}
.work__label {
  align-self: end;
  max-width: 21rem;
  display: grid; gap: .9rem; justify-items: start;
  padding-bottom: .4rem;
}
.work__desc { color: var(--dim); font-size: .98rem; }
.work__award {
  position: relative;
  padding-left: 1.1rem;
  font: 400 .95rem/1.6 var(--hand); letter-spacing: .1em;
  color: var(--sulfur);
}
.work__award::before {
  content: ""; position: absolute; left: 0; top: .78em;
  width: .5rem; height: 1px; background: currentColor;
}
.work__actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem 1.6rem; margin-top: 1rem; }
.work__out { font-size: .92rem; }

/* wall text: what came of it, what I did, why it looks this way */
.work__notes {
  grid-row: 3;
  display: grid; gap: 1.6rem;
  width: min(100%, 44rem);
  margin-top: clamp(3rem, 9vh, 5.5rem);
}
.work__notes > div {
  display: grid; grid-template-columns: 5.5rem minmax(0, 1fr); column-gap: 1.4rem;
  padding-top: 1.1rem; border-top: 1px solid var(--hair);
}
.work__notes dt { font: 400 .92rem/1.95 var(--hand); letter-spacing: .2em; color: var(--sulfur); }
.work__notes dd { margin: 0; color: var(--dim); font-size: .98rem; line-height: 1.95; max-width: 34em; }
.work__notes dd b { display: block; margin-top: .7rem; font: 400 .82rem/1.6 var(--hand); letter-spacing: .2em; color: var(--bone); }
.work__notes dd b:first-child { margin-top: 0; }

/* room 01: image bleeds off the left edge, title stands vertical like a wall placard */
.room-wall--sulfur .work { padding-right: var(--gut); }
.room-wall--sulfur .work__notes { grid-column: 1 / -1; justify-self: end; }
.room-wall--sulfur .work__label { padding-top: 2rem; }
.room-wall--sulfur .work__title {
  writing-mode: vertical-rl;
  letter-spacing: .12em;
  justify-self: start;
  margin-top: -1rem;
  font-size: clamp(2.6rem, 4.8vw, 4.8rem);
}

/* room 02: mirrored, image bleeds right, title overlaps the frame's lower edge */
.room-wall--magma { padding-top: calc(var(--sect) * 1.2); }
.room-wall--magma .room-wall__no { left: auto; right: var(--gut); }
.room-wall--magma .work {
  grid-template-columns: 1fr var(--major);
  padding-left: var(--gut);
}
.room-wall--magma .work__dark { grid-column: 2; grid-row: 1; }
.room-wall--magma .work__title {
  grid-column: 1 / -1; grid-row: 2;
  margin-top: -.58em;
  position: relative; z-index: 2;
  font-size: clamp(3rem, 8.2vw, 8.4rem);
  letter-spacing: -.04em;
  pointer-events: none;
  text-shadow: 0 0 60px rgba(7, 5, 10, .8);
}
.room-wall--magma .work__label { grid-column: 2; grid-row: 3; align-self: start; margin-top: 1.6rem; }
.room-wall--magma .work__notes { grid-column: 1; grid-row: 3; align-self: start; margin-top: 1.6rem; padding-top: .4rem; }
.room-wall--magma .work__notes > div { grid-template-columns: 1fr; row-gap: .2rem; }

/* ===== Corridor: a native swipe row by default; html.scrub (wide + fine pointer + motion OK) pins it ===== */
.corridor { position: relative; margin-top: var(--sect); }
/* unpinned, the title is the section's first line: keep it below the fixed bar like the padded sections */
html:not(.scrub) .corridor { scroll-margin-top: 6.5rem; }
.corridor__pin {
  display: grid; grid-template-rows: auto 1fr auto; grid-template-columns: minmax(0, 1fr);
  row-gap: 2.5rem;
}
.corridor__head {
  padding: 0 var(--gut);
  display: grid; grid-template-columns: var(--minor) 1fr; column-gap: var(--gut); align-items: end;
}
.corridor__head h2 {
  font: 900 clamp(2.4rem, 5vw, 4.8rem)/1 var(--serif); letter-spacing: -.02em;
}
.corridor__head p { max-width: 24rem; color: var(--dim); justify-self: start; }

.corridor__track {
  display: flex; align-items: flex-start;
  gap: clamp(2.5rem, 6vw, 6rem);
  overflow-x: auto; overscroll-behavior-x: contain;
  scroll-snap-type: x mandatory; scroll-padding-left: var(--gut);
  padding: .75rem 20vw 1.5rem var(--gut);
}
.cell { position: relative; flex: none; width: clamp(15rem, 27vw, 26rem); scroll-snap-align: start; }
.cell--wide { width: clamp(20rem, calc(27vw * 1.618), 42rem); }
.cell--low { margin-top: clamp(2.5rem, 12vh, 8rem); }
.cell__frame {
  aspect-ratio: 16 / 9; overflow: hidden; background: var(--cave-2);
  outline: 1px solid var(--hair); outline-offset: 7px;
  transition: outline-color 1.1s var(--ease);
}
.cell__frame img { width: 100%; height: 100%; object-fit: cover; transition: filter 1.1s var(--ease); }
.cell figcaption {
  margin-top: 1.4rem; max-width: 22rem;
  font: 400 .98rem/1.85 var(--hand); color: var(--bone); letter-spacing: .06em;
}
.cell figcaption b { display: block; margin-bottom: .35rem; font-weight: 400; color: var(--sulfur); }
.corridor__rail { display: none; }

/* pinned: 1px of scroll moves the track 1px; the cell off the golden line is only slightly muted */
.scrub .corridor { height: calc(var(--travel, 0px) + 100vh); }
.scrub .corridor__pin {
  position: sticky; top: 0; height: 100dvh; overflow: hidden; row-gap: 0;
  padding: clamp(5.5rem, 13vh, 8rem) 0 clamp(2rem, 5vh, 3rem);
}
.scrub .corridor__track {
  align-self: center; justify-self: start;
  width: max-content; overflow: visible; scroll-snap-type: none;
  gap: clamp(3rem, 6vw, 6rem);
  padding: 0 20vw 0 var(--minor);
  transform: translate3d(calc(var(--travel, 0px) * var(--p, 0) * -1), 0, 0);
  will-change: transform;
}
.scrub .cell:not(.is-on) .cell__frame img { filter: brightness(.82) saturate(.8); }
.scrub .cell:not(.is-on) figcaption { color: var(--dim); }
.scrub .cell:not(.is-on) figcaption b { color: var(--faint); }
.scrub .cell.is-on .cell__frame { outline-color: rgba(214, 196, 90, .35); }
.scrub .corridor__rail { display: block; margin: 0 var(--gut); height: 1px; background: var(--hair); }
.corridor__rail i {
  display: block; height: 100%; background: var(--sulfur);
  transform: scaleX(var(--p, 0)); transform-origin: left;
}

/* ===== Programme (pricing as a theatre bill) ===== */
.programme {
  display: grid;
  grid-template-columns: var(--minor) 1fr;
  column-gap: var(--gut);
  padding: var(--sect) var(--gut) 0;
}
.programme__title {
  grid-column: 1; grid-row: 1 / span 3;
  align-self: start; position: sticky; top: 7rem;
  font: 900 clamp(2.8rem, 5.6vw, 5.4rem)/1.04 var(--serif); letter-spacing: -.03em;
}
.programme__sub { grid-column: 2; color: var(--dim); margin-bottom: clamp(3rem, 7vh, 5rem); }
.bill { grid-column: 2; }
.show {
  display: grid;
  grid-template-columns: 6.5rem minmax(0, 1fr);
  grid-template-areas:
    "slot name"
    ".    price"
    ".    desc"
    ".    spec"
    ".    pick";
  column-gap: clamp(1rem, 3vw, 3rem);
  row-gap: .9rem;
  align-items: baseline;
  padding: 2.6rem 0 2.8rem;
  border-top: 1px solid var(--hair);
}
.show__slot { grid-area: slot; }
.show__name { grid-area: name; font: 700 clamp(1.6rem, 2.6vw, 2.3rem)/1.3 var(--serif); letter-spacing: .02em; }
.show__price {
  grid-area: price;
  font: 400 clamp(1.7rem, 2.8vw, 2.5rem)/1.2 var(--serif);
  letter-spacing: .01em; font-variant-numeric: lining-nums tabular-nums;
}
.show__price small { font: 400 .8rem/1 var(--mono); letter-spacing: .08em; color: var(--faint); margin: 0 .4em; }
.show__desc { grid-area: desc; color: var(--dim); max-width: 34rem; }
.show__spec { grid-area: spec; display: grid; gap: .35rem; max-width: 38rem; margin-top: .4rem; font-size: .92rem; }
.show__spec > div { display: grid; grid-template-columns: 7.5rem minmax(0, 1fr); column-gap: 1rem; }
.show__spec dt { font: 400 .88rem/1.8 var(--hand); letter-spacing: .08em; color: var(--faint); }
.show__spec dd { margin: 0; color: var(--dim); line-height: 1.8; }
.show__pick {
  grid-area: pick; align-self: end; justify-self: end;
  font: 400 .9rem/1 var(--hand); letter-spacing: .24em; color: var(--sulfur);
  padding-bottom: .45rem; border-bottom: 1px solid rgba(214, 196, 90, .35);
  transition: border-color .5s var(--ease), letter-spacing .7s var(--ease);
}
.show__pick:hover { border-color: var(--sulfur); letter-spacing: .32em; }
/* the headline show steps out of the column, lit from above */
.show--headline {
  margin-left: clamp(-6rem, -7vw, -2rem);
  padding-left: clamp(2rem, 7vw, 6rem);
  border-top-color: rgba(214, 196, 90, .5);
  background: radial-gradient(ellipse 55% 120% at 30% 0%, rgba(214, 196, 90, .07), transparent 70%);
}
.show--headline .show__slot { color: var(--sulfur); }
.show--headline .show__name { font-size: clamp(2rem, 3.4vw, 3rem); font-weight: 900; }
.show--headline .show__price { color: var(--sulfur); }
.programme__note { grid-column: 2; display: grid; gap: .3rem; padding-top: 1.6rem; border-top: 1px solid var(--hair); color: var(--faint); font-size: .88rem; }

/* ===== EDL (process as an edit decision list) ===== */
.edl {
  display: grid;
  grid-template-columns: var(--minor) 1fr;
  grid-template-rows: auto 1fr;
  column-gap: var(--gut);
  padding: var(--sect) var(--gut) 0;
}
.edl__title { font: 900 clamp(2.4rem, 4.6vw, 4.4rem)/1 var(--serif); letter-spacing: -.02em; }
.edl__sub { grid-column: 1; margin-top: 1.4rem; color: var(--dim); max-width: 19rem; }
.edl__list { grid-column: 2; grid-row: 1 / span 2; }
.event {
  --n: 0;
  position: relative;
  display: grid;
  grid-template-columns: 4rem minmax(0, 11rem) minmax(0, 24rem);
  column-gap: clamp(1rem, 2.4vw, 2.4rem);
  align-items: baseline;
  padding: 1.9rem 0 2.6rem;
  margin-left: calc(var(--n) * clamp(0rem, 4.8vw, 4.5rem));
  border-top: 1px solid var(--hair);
}
.event:nth-child(2) { --n: 1; }
.event:nth-child(3) { --n: 2; }
.event:nth-child(4) { --n: 3; }
.event h3 { font: 700 1.3rem/1.5 var(--serif); letter-spacing: .04em; }
.event p { color: var(--dim); font-size: .98rem; }
.event__fx {
  position: absolute; right: 0; top: 0; transform: translateY(-50%);
  padding-left: .8rem; background: var(--cave); color: var(--magma);
}
.event:last-child .event__fx { color: var(--faint); }

/* ===== Backstage (contact) ===== */
.backstage {
  position: relative;
  display: grid;
  grid-template-columns: var(--minor) 1fr;
  column-gap: var(--gut);
  padding: calc(var(--sect) * 1.3) var(--gut) var(--sect);
  isolation: isolate;
}
.backstage::before {
  content: ""; position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(ellipse 70% 60% at 20% 100%, rgba(58, 15, 10, .9), transparent 70%),
    radial-gradient(ellipse 40% 40% at 12% 100%, rgba(220, 47, 2, .16), transparent 70%);
}
.backstage__title {
  grid-column: 1 / -1;
  font: 900 clamp(3.6rem, 11vw, 11rem)/.92 var(--serif); letter-spacing: -.05em;
  margin-bottom: clamp(3rem, 8vh, 6rem);
}
.backstage__title span { display: block; }
.backstage__title span:last-child { padding-left: var(--minor); color: var(--sulfur); }
.backstage__sub { grid-column: 1; color: var(--dim); max-width: 20rem; }
.reach { grid-column: 1; margin-top: 2.6rem; display: grid; gap: 1.6rem; align-content: start; }
.reach a { display: grid; gap: .25rem; }
.reach__value {
  justify-self: start; padding-bottom: .2rem;
  font: 400 min(1.3rem, 5.6vw)/1.3 var(--serif); letter-spacing: .02em;
  overflow-wrap: anywhere; /* a long handle must not widen the column on 320px phones */
  background: linear-gradient(currentColor, currentColor) 0 100% / 0 1px no-repeat;
  transition: background-size .7s var(--ease), color .5s var(--ease);
}
.reach a:hover .reach__value { background-size: 100% 1px; color: var(--sulfur); }

.form {
  grid-column: 2; grid-row: 2 / span 2;
  display: grid; gap: 2.2rem;
  align-content: start;
  max-width: 40rem; justify-self: end; width: 100%;
}
.form__intro { color: var(--dim); font-size: .95rem; }
.form__biz:not([hidden]) { display: grid; gap: 2.2rem; }
.form__hint { color: var(--sulfur); font-size: .95rem; }
.field[hidden] { display: none; }
.field { display: grid; gap: .6rem; min-width: 0; margin: 0; padding: 0; border: 0; }
.field label, .field legend { padding: 0; font: 400 .98rem/1.5 var(--hand); letter-spacing: .1em; color: var(--bone); }
.form__req, .form__opt { margin-left: .7em; font: 400 .75rem/1 var(--mono); letter-spacing: .08em; vertical-align: .15em; }
.form__req { color: var(--sulfur); }
.form__opt { color: var(--faint); }
.field input[type="text"], .field textarea {
  width: 100%; border: 0; border-bottom: 1px solid var(--hair-2); border-radius: 0;
  background: transparent; padding: .7rem 0;
  font-size: 1.05rem;   /* ≥16px so iOS does not zoom on focus */
  appearance: none; -webkit-appearance: none;
  transition: border-color .5s var(--ease);
}
.field textarea { resize: vertical; min-height: 5.5rem; }
.field input:focus, .field textarea:focus { outline: 0; border-bottom-color: var(--sulfur); }
.field ::placeholder { color: var(--faint); }
.field [aria-invalid="true"] { border-bottom-color: var(--magma); }

/* chips: real radio buttons, drawn as tappable pills */
.chips legend { margin-bottom: .6rem; }
.chips__row { display: flex; flex-wrap: wrap; gap: .6rem; }
.chips label { position: relative; font: inherit; letter-spacing: normal; }
.chips input { position: absolute; inset: 0; opacity: 0; margin: 0; cursor: pointer; }
.chips__row span {
  display: inline-flex; align-items: center; min-height: 2.75rem; padding: .45rem 1.05rem;
  border: 1px solid var(--hair-2); border-radius: 999px;
  font-size: .95rem; line-height: 1.3; color: var(--bone);
  transition: background-color .3s var(--ease), border-color .3s var(--ease), color .3s var(--ease);
}
.chips__row label:hover span { border-color: rgba(214, 196, 90, .6); }
.chips input:checked + span { background: var(--sulfur); border-color: var(--sulfur); color: var(--cave); }
.chips input:focus-visible + span { outline: 1px solid var(--sulfur); outline-offset: 3px; }
.chips.is-invalid .chips__row span { border-color: rgba(232, 93, 4, .7); }

.form__actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem 1.6rem; }
.form__copy {
  border: 0; border-bottom: 1px solid rgba(214, 196, 90, .4); background: none; padding: .35rem 0; cursor: pointer;
  font: 400 .95rem/1.4 var(--hand); letter-spacing: .14em; color: var(--sulfur);
}
.form__copy:hover { border-bottom-color: var(--sulfur); }
.form__msg { font-size: .9rem; color: var(--dim); }
.form__msg.is-error { color: #ff8a3d; }
.form__summary {
  width: 100%; padding: .9rem 1rem; border: 1px solid var(--hair-2); border-radius: 0;
  background: var(--cave-2); font: 400 .9rem/1.7 var(--mono); resize: vertical;
}
.form__note { padding-top: 1.2rem; border-top: 1px solid var(--hair); font-size: .88rem; color: var(--faint); }

/* ===== Footer ===== */
.foot {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 2rem var(--gut) 2.4rem;
  border-top: 1px solid var(--hair);
  font-size: .85rem; color: var(--faint);
}
.foot a { font-family: var(--hand); letter-spacing: .16em; transition: color .5s var(--ease); }
.foot a:hover { color: var(--sulfur); }

/* ===== The room: entering a work ===== */
.room {
  width: 100%; height: 100%; max-width: none; max-height: none;
  margin: 0; padding: 0; border: 0;
  color: var(--bone);
  background: var(--cave);
  overflow: hidden;
  --ox: 50%; --oy: 50%;
}
.room::backdrop { background: rgba(7, 5, 10, .9); }
.room[data-mood="sulfur"] { background: radial-gradient(ellipse 80% 70% at 70% 40%, #17140a, var(--cave) 70%); }
.room[data-mood="magma"] { background: radial-gradient(ellipse 80% 70% at 70% 40%, var(--mantle), var(--cave) 70%); }
.room[open] {
  display: grid;
  grid-template-columns: var(--minor) 1fr;
  grid-template-rows: 1fr auto;
  column-gap: var(--gut);
  padding: clamp(4.5rem, 10vh, 6.5rem) var(--gut) clamp(2rem, 5vh, 3rem);
}
/* the room opens like a lamp widening from where you clicked */
.room.is-entering { animation: room-in 1.1s var(--ease-door) both; }
.room.is-leaving { animation: room-out .7s var(--ease-door) both; }
@keyframes room-in {
  from { clip-path: circle(0 at var(--ox) var(--oy)); }
  to   { clip-path: circle(150vmax at var(--ox) var(--oy)); }
}
@keyframes room-out {
  from { clip-path: circle(150vmax at var(--ox) var(--oy)); opacity: 1; }
  to   { clip-path: circle(0 at var(--ox) var(--oy)); opacity: .4; }
}
.room__ghost {
  position: absolute; left: -0.06em; bottom: -.18em; z-index: 0;
  font: 900 clamp(8rem, 26vw, 26rem)/1 var(--serif); letter-spacing: -.06em;
  white-space: nowrap;
  color: transparent; -webkit-text-stroke: 1px rgba(232, 226, 212, .07);
  pointer-events: none;
}
.room__screen {
  grid-column: 2; grid-row: 1 / -1; align-self: center; justify-self: end;
  position: relative; z-index: 1;
  width: min(100%, calc((100dvh - 12rem) * 16 / 9));
  aspect-ratio: 16 / 9; background: #000;
  outline: 1px solid var(--hair); outline-offset: 12px;
  box-shadow: 0 50px 160px -50px rgba(232, 93, 4, .3);
}
.room[data-mood="sulfur"] .room__screen { box-shadow: 0 50px 160px -50px rgba(214, 196, 90, .25); }
.room__screen iframe { width: 100%; height: 100%; border: 0; }
.room__label { grid-column: 1; grid-row: 2; position: relative; z-index: 1; display: grid; gap: .7rem; align-content: end; }
.room__title { font: 900 clamp(2rem, 3.6vw, 3.4rem)/1.15 var(--serif); letter-spacing: -.01em; }
.room__kind { color: var(--dim); }
.room__award { font: 400 .95rem/1.6 var(--hand); color: var(--sulfur); letter-spacing: .1em; }
.room__award:empty { display: none; }
.room__out { justify-self: start; font-size: .92rem; }
.room__exit {
  position: absolute; top: clamp(1rem, 3vh, 2rem); right: calc(var(--gut) - .5rem); z-index: 2;
  border: 0; background: none; cursor: pointer; padding: 0 .5rem;
  min-width: 2.75rem; min-height: 2.75rem;
  font: 400 .9rem/2.75rem var(--hand); letter-spacing: .24em; color: var(--dim);
  transition: color .5s var(--ease);
}
.room__exit:hover { color: var(--sulfur); }
.room-open { overflow: hidden; }

/* ===== Mobile ===== */
@media (max-width: 767px) {
  :root { --gut: 1.25rem; --sect: 6.5rem; }
  body { font-size: 1rem; line-height: 1.9; }

  .bar__toggle {
    display: block; position: relative; z-index: 2;
    border: 0; background: none; padding: 0 .5rem; margin-right: -.5rem; cursor: pointer;
    min-width: 2.75rem; min-height: 2.75rem;
    font: 400 .9rem/2.75rem var(--hand); letter-spacing: .2em;
    white-space: nowrap;
  }
  .bar__menu {
    position: fixed; inset: 0; z-index: 1;
    flex-direction: column; justify-content: flex-end; gap: 1.4rem;
    padding: 6rem var(--gut) 18vh;
    background: rgba(7, 5, 10, .96);
    visibility: hidden; opacity: 0;
    transition: opacity .6s var(--ease), visibility 0s .6s;
  }
  .bar__menu a {
    display: flex; align-items: center; min-height: 2.75rem;
    font: 700 2rem/1.2 var(--serif); color: var(--bone);
    transform: translateY(1rem); opacity: 0;
    transition: transform .7s var(--ease), opacity .7s var(--ease);
  }
  .bar__menu a::after { display: none; }
  .bar__menu.is-open { visibility: visible; opacity: 1; transition: opacity .6s var(--ease); }
  .bar__menu.is-open a { transform: none; opacity: 1; }
  .bar__menu.is-open a:nth-child(2) { transition-delay: .05s; }
  .bar__menu.is-open a:nth-child(3) { transition-delay: .1s; }
  .bar__menu.is-open a:nth-child(4) { transition-delay: .15s; }
  .bar__menu.is-open a:nth-child(5) { transition-delay: .2s; }

  .overture { grid-template-columns: minmax(0, 1fr); grid-template-rows: none; padding-top: 5.5rem; align-content: start; }
  .overture__verse { grid-row: 1; writing-mode: horizontal-tb; letter-spacing: .3em; padding: 0 0 1.4rem; font-size: 1.05rem; }
  .overture__media { grid-column: 1; grid-row: 2; width: calc(100% - 10px); justify-self: center; }
  .overture__screen { outline-offset: 5px; }
  .overture__mark { grid-row: 3; margin-top: 2.2rem; font-size: clamp(min(3.6rem, 21vw), 21vw, 6rem); }
  .overture__pitch { grid-column: 1; grid-row: 4; justify-self: start; }
  .overture__awards { grid-row: 5; }
  .yu { grid-row: 6; justify-self: center; width: min(62vw, 16rem); margin-top: 3rem; }

  .room-wall--sulfur .work, .room-wall--magma .work { grid-template-columns: 1fr; padding: 0; column-gap: 0; }
  .room-wall--sulfur .work__dark,
  .room-wall--magma .work__dark { grid-column: 1; grid-row: 1; margin: 0 var(--gut); } /* centred on phones: equal margins both sides */
  .room-wall--sulfur .work__title,
  .room-wall--magma .work__title {
    grid-column: 1; grid-row: 2;
    position: relative; z-index: 2; pointer-events: none;
    writing-mode: horizontal-tb; letter-spacing: -.01em;
    margin: 1.4rem 0 0; padding: 0 var(--gut);
    /* 《大地沸騰的心》 is ~7.9em wide: one line inside the gutters, below the frame */
    font-size: clamp(1.8rem, calc((100vw - 2 * var(--gut)) / 8.3), 3.6rem);
    white-space: nowrap; text-shadow: none;
  }
  .room-wall--magma .work__title { text-align: right; }
  .room-wall--sulfur .work__label,
  .room-wall--magma .work__label { grid-column: 1; grid-row: 3; padding: 1.6rem var(--gut) 0; margin: 0; max-width: none; }
  .room-wall__no { top: 3.4rem; }
  .room-wall--sulfur .work__notes,
  .room-wall--magma .work__notes { grid-column: 1; grid-row: 4; justify-self: stretch; width: auto; margin: 2.8rem 0 0; padding: 0 var(--gut); }
  .work__notes > div { grid-template-columns: 1fr; row-gap: .2rem; }
  .overture__mark small { margin-top: 1.9em; font-size: clamp(1.05rem, 5.4vw, 2.2rem); letter-spacing: .06em; }
  .overture__awards ul { flex-direction: column; }

  .corridor__head { grid-template-columns: 1fr; row-gap: .8rem; }
  .corridor__track { gap: 1.5rem; padding-right: 12vw; }
  .cell { width: 78vw; }
  .cell--wide { width: 84vw; }
  .cell--low { margin-top: 0; }

  .programme, .edl, .backstage { grid-template-columns: minmax(0, 1fr); }
  .programme__title { position: static; grid-row: auto; margin-bottom: 1rem; }
  .programme__sub, .bill, .programme__note, .edl__list, .form, .reach, .backstage__sub { grid-column: 1; }
  .show {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: "slot" "name" "price" "desc" "spec" "pick";
    padding: 2rem 0 2.2rem;
  }
  .show__pick { justify-self: start; margin-top: .6rem; }
  .show--headline { margin-inline: calc(var(--gut) * -1); padding-inline: var(--gut); }

  .edl__list { grid-row: auto; margin-top: 3rem; }
  .event { grid-template-columns: 3rem 1fr; row-gap: .4rem; margin-left: calc(var(--n) * .9rem); }
  .event p { grid-column: 2; }

  .backstage__title { line-height: 1.02; }
  .backstage__title span:last-child { padding-left: 18vw; }
  .form { grid-row: auto; grid-template-columns: 1fr; margin-top: 3.4rem; justify-self: stretch; }
  .reach { margin-top: 2rem; }

  .room[open] { grid-template-columns: 1fr; grid-template-rows: 1fr auto 1fr; padding-top: 4.5rem; }
  .room__screen { grid-column: 1; grid-row: 2; width: 100%; outline-offset: 6px; }
  .room__label { grid-row: 3; align-content: start; padding-top: 2rem; }
}

/* ===== Reduced motion: still fog, no transitions (the corridor is never pinned, see main.js) ===== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  .grain { animation: none; }
}

/* ===== Vertical 9:16 works (room 03): a narrow frame, label and notes beside it ===== */
.work[data-orient="vertical"] .work__dark { aspect-ratio: 9 / 16; width: min(100%, 24rem); }
.room-wall--steam .work {
  grid-template-columns: min(24rem, 38vw) minmax(0, 1fr); grid-template-rows: auto auto 1fr;
  padding: 0 var(--gut) 0 calc(var(--gut) + 6vw);
}
.room-wall--steam .work__dark { grid-row: 1 / span 3; }
.room-wall--steam .work__title { font-size: clamp(2.4rem, 4.6vw, 4.6rem); letter-spacing: .02em; }
.room-wall--steam .work__label { align-self: start; margin-top: 1.6rem; }
.room-wall--steam .work__notes { grid-column: 2; grid-row: 3; align-self: start; }
.room.is-vertical .room__screen { aspect-ratio: 9 / 16; width: min(100%, calc((100dvh - 12rem) * 9 / 16)); }
@media (max-width: 767px) {
  .room-wall--steam .work { grid-template-columns: 1fr; grid-template-rows: none; padding: 0; }
  .room-wall--steam .work__dark { grid-row: 1; justify-self: center; }
  .work[data-orient="vertical"] .work__dark { width: min(76vw, 24rem); }
  .room-wall--steam .work__title { grid-row: 2; margin-top: 1.6rem; padding: 0 var(--gut); font-size: clamp(1.6rem, calc((100vw - 2 * var(--gut)) / 11.3), 3rem); white-space: nowrap; }
  .room-wall--steam .work__label { grid-row: 3; padding: 0 var(--gut); max-width: none; }
  .room-wall--steam .work__notes { grid-column: 1; grid-row: 4; width: auto; margin-top: 2.8rem; padding: 0 var(--gut); }
  .room.is-vertical .room__screen { justify-self: center; width: min(100%, calc((100dvh - 20rem) * 9 / 16)); }
}

/* ===== Short landscape (e.g. 844×390): the room scrolls instead of shrinking the video ===== */
@media (max-height: 500px) {
  .room { overflow-y: auto; }
  .room[open] { grid-template-rows: auto auto; padding-top: 3.5rem; row-gap: 1.5rem; }
  .room__screen, .room.is-vertical .room__screen { align-self: start; }
  .room__screen { width: min(100%, 36rem); }
  .room.is-vertical .room__screen { width: min(100%, 13.5rem); }
  .room__exit { position: fixed; }
}

/* 手機置中：標題、洽詢按鈕、標語、作品名 */
@media (max-width: 767px) {
  .overture__mark, .overture__mark span, .overture__mark small,
  .overture__pitch, .overture__forte, .overture__verse, .overture__cap,
  .backstage__title, .backstage__sub { text-align: center; justify-content: center; align-items: center; margin-left: auto; margin-right: auto; }
  .overture__mark { display: flex; flex-direction: column; }
  .overture__pitch .door-btn { display: table; margin-left: auto; margin-right: auto; }
  [class*="__name"], [class*="work__title"], .reel__title, .take__title { text-align: center; margin-left: auto; margin-right: auto; }
}

@media (max-width: 767px) {
  .yu figcaption { white-space: nowrap; font-size: clamp(10px, 3.2vw, 13px); letter-spacing: 0.02em; text-align: center; }
}