/* ==========================================================================
   The Space Between a Face and a Life — base styles
   Stage, design tokens, slide transitions, animation primitives, HUD.
   ========================================================================== */

:root {
  --ink: #061812;
  --forest-900: #0b231b;
  --forest-800: #12302a;
  --forest-700: #1d3d33;
  --forest-600: #34483d;
  --forest-500: #557168;
  --sage: #a5ada0;
  --cream: #f6f2ea;
  --paper: #fbf9f4;
  --linen: #ece5d8;
  --gold: #d6b98c;
  --gold-deep: #b8915f;
  --bronze: #8a5f34;

  --serif: "Instrument Serif", "Iowan Old Style", Georgia, "Times New Roman", serif;
  --sans: "Inter", "Segoe UI", "Helvetica Neue", Arial, sans-serif;

  --ease-out: cubic-bezier(.16, 1, .3, 1);
  --ease-io: cubic-bezier(.76, 0, .24, 1);
  --ease-soft: cubic-bezier(.33, 0, .15, 1);

  color-scheme: dark;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  overflow: hidden;
  background: var(--ink);
  transition: background-color .9s ease;
}

body {
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: none;             /* swipes turn pages instead of scrolling or zooming */
}

body.idle { cursor: none; }

ul { list-style: none; }
em { font-style: italic; }

/* ---------- Stage: a fixed 1920×1080 canvas scaled to fit ---------- */

.deck {
  position: fixed;
  left: 50%;
  top: 50%;
  width: 1920px;
  height: 1080px;
  transform: translate(-50%, -50%) scale(var(--s, .5));
  overflow: hidden;
  background: var(--ink);
}

/* ---------- Slides ---------- */

.slide {
  position: absolute;
  inset: 0;
  visibility: hidden;
  overflow: hidden;
  color: var(--cream);
  --base: .15s;
}

.slide[data-theme="light"] {
  color: var(--forest-800);
  background: linear-gradient(135deg, #faf7f1 0%, #f1ece2 55%, #e9e2d4 100%);
}

.slide[data-theme="dark"] {
  background: radial-gradient(120% 95% at 88% 0%, #23473b 0%, #12302a 42%, #081d16 100%);
}

.slide.is-current,
.slide.is-leaving { visibility: visible; }
.slide.is-current { z-index: 2; }
.slide.is-leaving { z-index: 1; }

/* Paused when off-stage, so hidden slides cost nothing */
.slide:not(.is-current):not(.is-leaving),
.slide:not(.is-current):not(.is-leaving) * { animation-play-state: paused !important; }

/* ---------- Slide transitions ----------
   Every build animation is delayed by var(--base) + var(--d).
   --base pushes builds behind the transition; a large negative
   --base (going back) completes every build instantly.          */

.slide[data-enter="intro"]  { --base: .35s; }
.slide[data-enter="fade"]   { --base: .25s; }
.slide[data-enter="window"] { --base: .7s; }
.slide[data-enter="dusk"]   { --base: 1s; }
.slide[data-enter="back"]   { --base: -60s; }

.slide.is-current[data-enter="dusk"] { animation: t-dusk-in 1.8s ease both; }
.slide.is-leaving[data-leave="dusk"] { animation: t-dusk-out 1s ease both; }
@keyframes t-dusk-in  { 0%, 40% { opacity: 0; } 100% { opacity: 1; } }
@keyframes t-dusk-out { to { filter: brightness(0); } }

.slide.is-current[data-enter="window"] {
  animation: t-window 1.4s var(--ease-io) both;
}
.slide.is-current[data-enter="window"]::after {
  content: "";
  position: absolute;
  z-index: 8;
  border: 2px solid var(--gold);
  border-radius: 3px;
  pointer-events: none;
  animation: t-window-line 1.4s var(--ease-io) both;
}
.slide.is-leaving[data-leave="window"] { animation: t-recede 1.4s var(--ease-io) both; }

.slide.is-current[data-enter="fade"]  { animation: t-fade-in .9s var(--ease-soft) both; }
.slide.is-leaving[data-leave="fade"]  { animation: t-hold .9s linear both; }
.slide.is-current[data-enter="back"]  { animation: t-fade-in .45s ease both; }
.slide.is-leaving[data-leave="back"]  { animation: t-hold .45s linear both; }

@keyframes t-window {
  from { clip-path: inset(var(--tw-box, 26% 45.5% 26% 45.5%) round 3px); }
  to   { clip-path: inset(0 0 0 0 round 0); }
}
@keyframes t-window-line {
  from { inset: var(--tw-box, 26% 45.5% 26% 45.5%); opacity: 1; }
  75%  { opacity: .7; }
  to   { inset: 0; opacity: 0; }
}
@keyframes t-recede {
  to { transform: scale(.93); filter: brightness(.4) saturate(.8); }
}
@keyframes t-fade-in {
  from { opacity: 0; transform: scale(1.012); }
  to   { opacity: 1; transform: none; }
}
@keyframes t-hold { to { opacity: 1; } }

/* ---------- Build animation primitives ---------- */

[data-a] { opacity: 0; }

.slide.in [data-a] {
  animation-duration: var(--t, 1s);
  animation-timing-function: var(--ease-out);
  animation-delay: calc(var(--base) + var(--d, 0s));
  animation-fill-mode: both;
}
.slide.in [data-a="fade"]   { animation-name: a-fade; }
.slide.in [data-a="rise"]   { animation-name: a-rise; }
.slide.in [data-a="blur"]   { animation-name: a-blur; --t: 1.4s; }
.slide.in [data-a="card"]   { animation-name: a-card; --t: 1.3s; }
.slide.in [data-a="pop"]    { animation-name: a-pop; --t: .8s; }
.slide.in [data-a="draw-x"] { animation-name: a-draw-x; --t: 1.2s; animation-timing-function: var(--ease-io); }
.slide.in [data-a="draw-y"] { animation-name: a-draw-y; --t: 1.2s; animation-timing-function: var(--ease-io); }

[data-a="draw-x"] { transform-origin: 0 50%; }
[data-a="draw-y"] { transform-origin: 50% 0; }

@keyframes a-fade   { from { opacity: 0; } to { opacity: 1; } }
@keyframes a-rise   { from { opacity: 0; transform: translateY(34px); } to { opacity: 1; transform: none; } }
@keyframes a-blur   { from { opacity: 0; filter: blur(16px); transform: scale(1.06); } to { opacity: 1; filter: blur(0); transform: none; } }
@keyframes a-card   { from { opacity: 0; transform: translateY(46px) scale(.985); } to { opacity: 1; transform: none; } }
@keyframes a-pop    { from { opacity: 0; transform: scale(.4); } to { opacity: 1; transform: none; } }
@keyframes a-draw-x { from { opacity: 1; transform: scaleX(0); } to { opacity: 1; transform: scaleX(1); } }
@keyframes a-draw-y { from { opacity: 1; transform: scaleY(0); } to { opacity: 1; transform: scaleY(1); } }

/* Masked line reveal: <span class="ln" style="--d:.2s"><span>Text</span></span> */
.ln {
  display: block;
  overflow: hidden;
  padding: 0 .14em .12em 0;
  margin-bottom: -.12em;
}
.ln > span { display: inline-block; transform: translateY(108%); }
.slide.in .ln > span {
  animation: a-mask 1.2s var(--ease-out) calc(var(--base) + var(--d, 0s)) both;
}
@keyframes a-mask { from { transform: translateY(108%); } to { transform: none; } }

/* Word-by-word reveal (built by effects.js from [data-split]) */
[data-split] .w { display: inline-block; opacity: 0; }
.slide.in [data-split] .w {
  animation: a-word 1s var(--ease-out)
    calc(var(--base) + var(--d, 0s) + var(--i) * var(--step, .07s)) both;
}
@keyframes a-word {
  from { opacity: 0; transform: translateY(.3em); filter: blur(8px); }
  to   { opacity: 1; transform: none; filter: blur(0); }
}

/* Character mask reveal (built by effects.js from [data-chars]) */
.ch { display: inline-block; overflow: hidden; vertical-align: top; padding-bottom: .06em; }
.ch > span { display: inline-block; transform: translateY(110%); }
.slide.in .ch > span {
  animation: a-mask 1.1s var(--ease-out) calc(var(--base) + var(--d, 0s) + var(--i) * .08s) both;
}

/* Underline that draws under a word */
.u { position: relative; white-space: nowrap; }
.u::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: .02em;
  height: max(2px, .055em);
  background: var(--u-color, var(--gold-deep));
  transform: scaleX(0);
  transform-origin: 0 50%;
}
.slide.in .u::after {
  animation: a-draw-x 1s var(--ease-io) calc(var(--base) + var(--d, 0s)) both;
}

/* ---------- Shared components ---------- */

.head {
  position: absolute;
  left: 120px;
  right: 120px;
  top: 88px;
  z-index: 3;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 18px;
  font: 500 17px/1 var(--sans);
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--bronze);
  margin-bottom: 22px;
}
.eyebrow::before {
  content: "";
  width: 44px;
  height: 1px;
  background: currentColor;
  opacity: .7;
}
.slide[data-theme="dark"] .eyebrow { color: var(--gold); }

.title {
  font: 400 92px/1 var(--serif);
  letter-spacing: -.012em;
  color: var(--forest-800);
}
.slide[data-theme="dark"] .title { color: var(--cream); }

.kicker {
  font: 500 24px/1.3 var(--sans);
  letter-spacing: .04em;
  color: var(--bronze);
}
.slide[data-theme="dark"] .kicker,
.card-dark .kicker { color: var(--gold); }

.hair {
  display: block;
  height: 1px;
  background: currentColor;
  opacity: .22;
}
.slide.in .hair[data-a] { animation-name: a-draw-hair; }
@keyframes a-draw-hair { from { opacity: .22; transform: scaleX(0); } to { opacity: .22; transform: scaleX(1); } }

.card {
  position: absolute;
  z-index: 2;
  border-radius: 22px;
  padding: 48px 56px;
}
.card-dark {
  color: var(--cream);
  background: linear-gradient(145deg, #25493d 0%, #15352c 55%, #0c241d 100%);
  box-shadow: 0 50px 90px -50px rgba(6, 24, 18, .6), inset 0 1px 0 rgba(255, 255, 255, .07);
}
.card-light {
  color: var(--forest-800);
  background: linear-gradient(160deg, #fffefb 0%, #f8f4ec 100%);
  border: 1px solid rgba(52, 72, 61, .1);
  box-shadow: 0 50px 90px -56px rgba(6, 24, 18, .38);
}
.card-glass {
  color: var(--cream);
  background: linear-gradient(160deg, rgba(255, 255, 255, .075), rgba(255, 255, 255, .02));
  border: 1px solid rgba(214, 185, 140, .2);
  box-shadow: 0 50px 100px -60px rgba(0, 0, 0, .7);
}

/* Photo: opens like a window, then breathes slowly */
.ph { position: absolute; z-index: 2; margin: 0; --casing: rgba(18, 48, 42, .22); }
.slide[data-theme="dark"] .ph { --casing: rgba(214, 185, 140, .32); }

.ph .clip {
  position: absolute;
  inset: 0;
  overflow: hidden;
  border-radius: 6px;
  clip-path: inset(50% 50% 50% 50%);
  background: rgba(0, 0, 0, .08);
}
.slide.in .ph .clip {
  animation: a-open 1.8s var(--ease-io) calc(var(--base) + var(--d, 0s)) both;
}
.ph .kb { position: absolute; inset: 0; animation: a-kb 26s ease-in-out infinite alternate; }
.ph img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.3);
}
.slide.in .ph img {
  animation: a-unzoom 2.6s var(--ease-out) calc(var(--base) + var(--d, 0s)) both;
}
.ph::before {
  content: "";
  position: absolute;
  inset: -18px;
  border: 1px solid var(--casing);
  border-radius: 12px;
  opacity: 0;
  pointer-events: none;
}
.slide.in .ph::before {
  animation: a-casing 1.6s var(--ease-out) calc(var(--base) + var(--d, 0s) + 1.1s) both;
}

@keyframes a-open {
  from { clip-path: inset(var(--from, 38% 38% 38% 38%) round 6px); }
  to   { clip-path: inset(0 0 0 0 round 6px); }
}
@keyframes a-unzoom { from { transform: scale(1.3); } to { transform: scale(1); } }
@keyframes a-kb     { from { transform: scale(1); } to { transform: scale(1.06); } }
@keyframes a-casing { from { opacity: 0; transform: scale(1.05); } to { opacity: 1; transform: none; } }

/* Window light falling on the wall — a quiet motif on content slides */
.sunlight {
  position: absolute;
  z-index: 0;
  right: -160px;
  top: -140px;
  width: 980px;
  height: 820px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 38px;
  transform: skewX(-16deg) rotate(5deg);
  filter: blur(30px);
  pointer-events: none;
  animation: sun-drift 24s ease-in-out infinite alternate;
}
.sunlight i { background: #fffdf7; opacity: .85; }
.slide[data-theme="dark"] .sunlight { mix-blend-mode: screen; }
.slide[data-theme="dark"] .sunlight i { background: rgba(214, 185, 140, .06); opacity: 1; }
@keyframes sun-drift {
  from { transform: skewX(-16deg) rotate(5deg) translate(0, 0); }
  to   { transform: skewX(-13deg) rotate(4deg) translate(-70px, 30px); }
}

/* ---------- HUD: page marker + progress ---------- */

.hud {
  position: absolute;
  inset: 0;
  z-index: 20;
  pointer-events: none;
  --hud: rgba(246, 242, 234, .62);
  color: var(--hud);
  transition: color .9s ease;
}
.deck[data-theme="light"] .hud { --hud: rgba(18, 48, 42, .55); }

.hud-page {
  position: absolute;
  right: 120px;
  bottom: 50px;
  display: flex;
  align-items: baseline;
  gap: .55em;
  font: 500 19px/1 var(--sans);
  letter-spacing: .2em;
  font-variant-numeric: tabular-nums;
}
.hud-cur { display: inline-block; }
.hud-cur.tick { animation: hud-tick .7s var(--ease-out) both; }
.hud-sep { opacity: .5; }
.hud-page.solo .hud-sep,
.hud-page.solo .hud-tot { display: none; }
@keyframes hud-tick { from { opacity: 0; transform: translateY(70%); } to { opacity: 1; transform: none; } }

.hud-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
}
.hud-progress i {
  display: block;
  height: 100%;
  background: var(--gold-deep);
  opacity: .75;
  transform-origin: 0 50%;
  transform: scaleX(var(--p, 0));
  transition: transform 1.3s var(--ease-io);
}

/* ---------- Film grain ---------- */

.grain {
  position: absolute;
  inset: -50%;
  z-index: 19;
  pointer-events: none;
  opacity: .07;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 .5 0 0 0 0 .5 0 0 0 0 .5 0 0 0 1 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
  animation: grain 1.4s 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); }
}

/* ---------- Overlays: blackout, help ---------- */

.blackout {
  position: fixed;
  inset: 0;
  z-index: 50;
  background: #000;
  opacity: 0;
  pointer-events: none;
  transition: opacity .6s ease;
}
body.is-black .blackout { opacity: 1; pointer-events: auto; }

.help {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 60;
  width: 340px;
  padding: 22px 26px;
  border-radius: 14px;
  background: rgba(6, 24, 18, .92);
  border: 1px solid rgba(214, 185, 140, .25);
  color: var(--cream);
  font: 400 14px/1.6 var(--sans);
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity .3s ease, transform .3s ease;
}
body.show-help .help { opacity: 1; transform: none; pointer-events: auto; }
.help h4 {
  font: 500 12px/1 var(--sans);
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 12px;
}
.help dl { display: grid; grid-template-columns: auto 1fr; gap: 6px 16px; }
.help dt { color: var(--gold); font-variant-numeric: tabular-nums; white-space: nowrap; }
.help dd { color: rgba(246, 242, 234, .82); }

.jump {
  position: fixed;
  left: 50%;
  bottom: 40px;
  z-index: 60;
  transform: translateX(-50%);
  padding: 10px 20px;
  border-radius: 999px;
  background: rgba(6, 24, 18, .9);
  color: var(--gold);
  font: 500 18px/1 var(--sans);
  letter-spacing: .2em;
  opacity: 0;
  transition: opacity .2s;
  pointer-events: none;
}
.jump.on { opacity: 1; }

/* Touch screens: how to turn pages (always shown in portrait, in the bar under the stage) */
.touch-hint {
  position: fixed;
  left: 50%;
  bottom: calc(env(safe-area-inset-bottom, 0px) + 22px);
  z-index: 40;
  display: none;
  align-items: center;
  gap: 10px;
  max-width: calc(100vw - 32px);
  padding: 9px 16px;
  border-radius: 20px;
  background: rgba(6, 24, 18, .88);
  border: 1px solid rgba(214, 185, 140, .28);
  color: var(--gold);
  font: 500 12px/1.3 var(--sans);
  letter-spacing: .06em;
  text-align: center;
  width: max-content;
  transform: translateX(-50%);
  opacity: 0;
  pointer-events: none;
  transition: opacity .6s ease;
}
.touch-hint svg { flex: none; width: 18px; height: 18px; }
.touch-hint .th-rotate { display: none; }
@media (pointer: coarse) {
  .touch-hint { display: flex; }
  body.hint .touch-hint { opacity: 1; }
}
@media (pointer: coarse) and (orientation: portrait) {
  .touch-hint { opacity: 1; }
  .touch-hint .th-rotate { display: inline; }
}

@media (prefers-reduced-motion: reduce) {
  .grain, .sunlight, .ph .kb { animation: none !important; }
}