/* The Course of Empire — styles.
   Every size is the pixel value from the Figma mockups (1440 × 900 frames).
   --u is one design pixel. It is 1px, so type and spacing match the mockups
   on any screen. To scale the whole interface with the window instead,
   set --u to calc(100vw / 1440). */

@font-face {
  font-family: "Quelia";
  src: url("../assets/fonts/quelia-trial.woff") format("woff"),
       url("../assets/fonts/quelia-trial.otf") format("opentype");
  font-weight: 400; font-style: normal; font-display: block;
}
@font-face { font-family: "Geist"; src: url("../assets/fonts/geist-latin-300-normal.woff2") format("woff2"); font-weight: 300; font-display: swap; }
@font-face { font-family: "Geist"; src: url("../assets/fonts/geist-latin-400-normal.woff2") format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Geist Mono"; src: url("../assets/fonts/geist-mono-latin-200-normal.woff2") format("woff2"); font-weight: 200; font-display: swap; }
@font-face { font-family: "Geist Mono"; src: url("../assets/fonts/geist-mono-latin-300-normal.woff2") format("woff2"); font-weight: 300; font-display: swap; }
@font-face { font-family: "Geist Mono"; src: url("../assets/fonts/geist-mono-latin-400-normal.woff2") format("woff2"); font-weight: 400; font-display: swap; }

:root {
  --ink: #0f0b08;
  --paper: #fbf8ee;
  --paper-70: rgba(251, 248, 238, 0.7);
  --paper-60: rgba(251, 248, 238, 0.6);
  --paper-40: rgba(251, 248, 238, 0.4);
  --paper-25: rgba(251, 248, 238, 0.25);
  --u: 1px;
  --pad: calc(var(--u) * 24);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --fade: 600ms;
}

*, *::before, *::after { box-sizing: border-box; }
html { background: var(--ink); scrollbar-width: none; }
html::-webkit-scrollbar { display: none; }
body {
  margin: 0; background: var(--ink); color: var(--paper);
  font-family: "Geist", system-ui, sans-serif; font-weight: 400;
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}
body.is-loading, body.is-locked { overflow: hidden; }
p, h2, figure { margin: 0; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; text-align: inherit; }
a { color: inherit; text-decoration: none; }
img { display: block; }
:focus-visible { outline: 1px solid var(--paper); outline-offset: calc(var(--u) * 4); }

.display { font-family: "Quelia", "Cormorant Unicase", "Cormorant Garamond", Georgia, serif; font-weight: 400; }
.mono { font-family: "Geist Mono", ui-monospace, monospace; font-size: max(calc(var(--u) * 12), 10px); letter-spacing: -0.02em; line-height: 0.9; }

/* ---- Scroll length ---- */
.scroll { height: 1300vh; }

/* ---- Stage ---- */
.stage { position: fixed; inset: 0; overflow: hidden; background: var(--ink); }
.stage__canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }

/* ---- Pointer parallax ----
   js/main.js moves a few layers by a few pixels with the pointer (the CSS `translate` property,
   so it never fights the transforms used for layout and transitions). The film is slightly
   over-scaled so its edges never show while it shifts. Mouse only; off for reduced motion. */
.has-parallax .stage__canvas { scale: 1.035; will-change: transform; }
.has-parallax .titles, .has-parallax .bodies, .has-parallax .centers, .has-parallax .card { will-change: transform; }

/* ---- Cursor (mouse only) ---- */
.cursor { position: fixed; left: 0; top: 0; z-index: 40; width: 0; height: 0; pointer-events: none; opacity: 0; transition: opacity 300ms var(--ease); will-change: transform; }
.cursor.is-on { opacity: 1; }
.cursor svg { position: absolute; left: -8px; top: -8px; width: 16px; height: 16px; display: block; overflow: visible; }
.cursor__ring { transform-origin: 8px 8px; transition: opacity 300ms var(--ease), scale 450ms var(--ease); }
.cursor.is-hover .cursor__ring { opacity: 0; scale: 0.35; }
.has-cursor, .has-cursor * { cursor: none !important; }

.fade { position: absolute; left: 0; right: 0; pointer-events: none; }
.fade::before {
  content: ""; position: absolute; left: calc(var(--u) * -38); right: calc(var(--u) * -38);
  filter: blur(calc(var(--u) * 28));
}
.fade--top { top: 0; height: calc(var(--u) * 110); }
.fade--top::before { top: calc(var(--u) * -40); height: calc(var(--u) * 150); background: linear-gradient(to bottom, var(--ink), rgba(15, 11, 8, 0)); }
.fade--bottom { bottom: 0; height: calc(var(--u) * 320); }
.fade--bottom::before { bottom: calc(var(--u) * -40); height: calc(var(--u) * 360); background: linear-gradient(to top, var(--ink), rgba(15, 11, 8, 0)); }

/* ---- Header ---- */
.header {
  position: absolute; top: 0; left: 0; right: 0; height: calc(var(--u) * 92);
  padding: var(--pad); display: flex; justify-content: space-between; align-items: flex-start;
}
.header__logo {
  position: absolute; left: 50%; top: var(--pad); transform: translateX(-50%);
  font-size: calc(var(--u) * 24); line-height: 0.9; letter-spacing: -0.02em; text-align: center; white-space: nowrap;
}
.header__about { cursor: default; }
.sound:hover { opacity: 0.6; }

.sound { display: inline-flex; align-items: center; gap: calc(var(--u) * 8); white-space: nowrap; transition: opacity 200ms; }
.sound__bars { display: inline-flex; align-items: center; gap: calc(var(--u) * 2); height: calc(var(--u) * 14); }
.sound__bars i { display: block; width: max(1px, calc(var(--u) * 1)); background: var(--paper); transform-origin: center; }
.sound__bars i:nth-child(1) { height: calc(var(--u) * 4); }
.sound__bars i:nth-child(2) { height: calc(var(--u) * 8); }
.sound__bars i:nth-child(3) { height: calc(var(--u) * 14); }
.sound__bars i:nth-child(4) { height: calc(var(--u) * 6); }
.sound__bars i:nth-child(5) { height: calc(var(--u) * 10); }
.sound__bars i:nth-child(6) { height: calc(var(--u) * 4); }
.sound[aria-pressed="true"] .sound__bars i { animation: bars 1.1s ease-in-out infinite alternate; }
.sound[aria-pressed="true"] .sound__bars i:nth-child(2) { animation-delay: -0.3s; }
.sound[aria-pressed="true"] .sound__bars i:nth-child(3) { animation-delay: -0.7s; }
.sound[aria-pressed="true"] .sound__bars i:nth-child(4) { animation-delay: -0.5s; }
.sound[aria-pressed="true"] .sound__bars i:nth-child(5) { animation-delay: -0.9s; }
.sound[aria-pressed="true"] .sound__bars i:nth-child(6) { animation-delay: -0.2s; }
.sound[aria-pressed="false"] .sound__bars i { height: calc(var(--u) * 2); }
@keyframes bars { from { transform: scaleY(0.45); } to { transform: scaleY(1); } }

/* ---- Painting card ---- */
.card {
  position: absolute; top: calc(var(--u) * 92); right: var(--pad);
  background: var(--paper); color: var(--ink); padding: calc(var(--u) * 12);
  display: flex; flex-direction: column; gap: calc(var(--u) * 8);
  opacity: 0; visibility: hidden; transform: translateY(calc(var(--u) * -8));
  transition: opacity var(--fade) var(--ease), transform var(--fade) var(--ease), visibility 0s linear var(--fade);
}
.card.is-on { opacity: 1; visibility: visible; transform: none; transition-delay: 0s; }
.card__img { display: block; width: calc(var(--u) * 220); height: calc(var(--u) * 124); overflow: hidden; }
.card__img img { width: 100%; height: 100%; object-fit: cover; transition: transform 700ms var(--ease); }
.card:hover .card__img img { transform: scale(1.05); }
.card__cap { font-weight: 300; font-size: max(calc(var(--u) * 14), 11px); line-height: 1.2; letter-spacing: -0.02em; white-space: nowrap; }

/* ---- Scene texts ---- */
.titles, .bodies, .centers { position: absolute; inset: 0; pointer-events: none; }

.title {
  position: absolute; left: var(--pad); bottom: var(--title-bottom, var(--pad));
  display: flex; flex-direction: column; gap: calc(var(--u) * 8);
  transition: bottom 700ms var(--ease);
}
.stage.has-rail .title { --title-bottom: calc(var(--u) * 143); }
.title__label { font-weight: 300; font-size: max(calc(var(--u) * 14), 11px); line-height: 1.2; letter-spacing: -0.02em; white-space: nowrap; }
.title--dim .title__label { color: var(--paper-70); }
.title__text { font-size: calc(var(--u) * 80); line-height: 0.88; letter-spacing: -0.02em; }

.body {
  position: absolute; right: var(--pad); top: 50%; transform: translateY(-50%);
  font-size: max(calc(var(--u) * 14), 11px); line-height: 1.2; letter-spacing: -0.02em; text-transform: uppercase;
}
.center {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  font-size: max(calc(var(--u) * 14), 11px); line-height: 1.2; letter-spacing: -0.02em; text-transform: uppercase; white-space: nowrap;
}

/* Shared enter / exit */
.title, .body, .center { opacity: 0; visibility: hidden; transition-property: opacity, visibility, bottom; transition-duration: var(--fade), 0s, 700ms; transition-timing-function: var(--ease); transition-delay: 0s, var(--fade), 0s; }
.title.is-on, .body.is-on, .center.is-on { opacity: 1; visibility: visible; transition-delay: 150ms, 0s, 0s; }
.title__text { transform: translateY(calc(var(--u) * 14)); transition: transform 900ms var(--ease); }
.title.is-on .title__text { transform: none; }

/* ---- Framed button ---- */
.btn-frame {
  border: 1px solid var(--paper-60); padding: calc(var(--u) * 20) calc(var(--u) * 32);
  font-size: calc(var(--u) * 24); line-height: 1; letter-spacing: -0.02em; text-align: center; white-space: nowrap;
  transition: background 300ms, color 300ms, border-color 300ms;
}
.btn-frame:hover { background: var(--paper); color: var(--ink); border-color: var(--paper); }
.btn-frame--center {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  opacity: 0; visibility: hidden; transition: opacity var(--fade) var(--ease), visibility 0s linear var(--fade), background 300ms, color 300ms, border-color 300ms;
}
.btn-frame--center.is-on { opacity: 1; visibility: visible; transition-delay: 0s; }

/* ---- Rail ---- */
.rail {
  position: absolute; left: var(--pad); bottom: var(--pad); display: flex; gap: calc(var(--u) * 24);
  opacity: 0; visibility: hidden; transition: opacity var(--fade) var(--ease), visibility 0s linear var(--fade);
}
.stage.has-rail .rail { opacity: 1; visibility: visible; transition-delay: 0s; }
.rail__item { width: calc(var(--u) * 260); display: flex; flex-direction: column; gap: calc(var(--u) * 16); }
.rail__line { display: block; position: relative; height: 1px; background: var(--paper-25); }
.rail__line i { position: absolute; inset: 0; background: var(--paper); transform-origin: left center; transform: scaleX(var(--p, 0)); }
.rail__row { display: flex; gap: calc(var(--u) * 8); align-items: stretch; }
.rail__thumb { width: calc(var(--u) * 112); height: calc(var(--u) * 62); object-fit: cover; opacity: 0.55; transition: opacity 400ms; }
.rail__item.is-current .rail__thumb, .rail__item:hover .rail__thumb { opacity: 1; }
.rail__text {
  width: calc(var(--u) * 120); padding: calc(var(--u) * 4) 0; display: flex; flex-direction: column; justify-content: space-between;
  font-size: max(calc(var(--u) * 12), 9px); line-height: 1.2; letter-spacing: -0.02em; text-transform: uppercase;
}
.rail__meta { color: var(--paper-60); }

/* ---- Scroll hint ---- */
.hint { position: absolute; right: var(--pad); bottom: var(--pad); font-weight: 300; line-height: 1.2; color: var(--paper-60); }

/* ---- Overlay ---- */
.overlay {
  position: fixed; inset: 0; z-index: 20; background: rgba(15, 11, 8, 0.9);
  opacity: 0; transition: opacity 500ms var(--ease);
}
.overlay[hidden] { display: none; }
.overlay.is-on { opacity: 1; }
.overlay__close { position: absolute; top: var(--pad); right: var(--pad); }
.overlay__close span { color: var(--paper-40); }
.overlay__close:hover { opacity: 0.6; }
.overlay__left {
  position: absolute; left: var(--pad); top: 50%; transform: translateY(-50%); width: calc(var(--u) * 318);
  display: flex; flex-direction: column; gap: calc(var(--u) * 24);
}
.overlay__year, .overlay__label, .overlay__right p { font-weight: 300; font-size: max(calc(var(--u) * 14), 11px); line-height: 1.2; letter-spacing: -0.02em; }
.overlay__title { margin: 0; font-size: calc(var(--u) * 44); line-height: 0.88; letter-spacing: -0.02em; }
.overlay__figure { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); width: calc(var(--u) * 669); }
.overlay__figure img { width: 100%; height: auto; transform: scale(0.97); opacity: 0; transition: transform 900ms var(--ease), opacity 700ms var(--ease); }
.overlay.is-on .overlay__figure img { transform: none; opacity: 1; }
.overlay__right {
  position: absolute; right: var(--pad); top: 50%; transform: translateY(-50%); width: calc(var(--u) * 318);
  display: flex; flex-direction: column; gap: calc(var(--u) * 16);
}
.overlay__note {
  position: absolute; left: 50%; bottom: var(--pad); transform: translateX(-50%); width: calc(var(--u) * 229);
  font-weight: 300; font-size: max(calc(var(--u) * 12), 10px); line-height: 1.2; letter-spacing: -0.02em; text-align: center; color: var(--paper-60);
}
.sound--overlay { position: absolute; right: var(--pad); bottom: var(--pad); }

/* ---- Preloader ---- */
.preloader { position: fixed; inset: 0; z-index: 30; background: var(--ink); transition: opacity 1800ms var(--ease), visibility 0s linear 1800ms; }
.preloader.is-done { opacity: 0; visibility: hidden; pointer-events: none; transition: opacity 1800ms var(--ease) 200ms, visibility 0s linear 2000ms; }
.preloader__top, .preloader__count, .preloader__status, .preloader__hint {
  position: absolute; left: 50%; transform: translateX(-50%); font-weight: 200; color: var(--paper-60); white-space: nowrap;
}
.preloader__top { top: var(--pad); }
.preloader__count { bottom: calc(var(--u) * 41); font-variant-numeric: tabular-nums; }
.preloader__status, .preloader__hint { bottom: var(--pad); }
.preloader__frame {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  width: calc(var(--u) * 428); height: calc(var(--u) * 240); display: grid; place-items: center;
  /* js/main.js sets the size and centre of the Enter button here: the frame draws in to become that button */
  transition: width 1300ms var(--ease), height 1300ms var(--ease), left 1300ms var(--ease), top 1300ms var(--ease);
}
@property --r { syntax: "<percentage>"; inherits: true; initial-value: 0%; }
.preloader__frame::before {
  content: ""; position: absolute; inset: 0; border: 1px solid var(--paper-60);
  /* The border flows out of the top-left corner: an elliptical mask whose radius follows the load,
     then opens fully once loading is complete. */
  --r: calc(6% + var(--load, 0) * 2.1%);
  -webkit-mask-image: radial-gradient(var(--r) var(--r) at 0 0, #000 55%, transparent 100%);
          mask-image: radial-gradient(var(--r) var(--r) at 0 0, #000 55%, transparent 100%);
  transition: --r 1600ms var(--ease);
}
.preloader.is-full .preloader__frame::before { --r: 300%; }
.preloader__title { font-size: calc(var(--u) * 24); line-height: 0.9; letter-spacing: -0.02em; text-align: center; white-space: nowrap; transition: opacity 500ms var(--ease); }
.preloader__enter {
  position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%);
  display: flex; flex-direction: column; align-items: center; gap: calc(var(--u) * 24);
  margin-top: calc(var(--u) * 19); opacity: 0; pointer-events: none;
}
.preloader__enter[hidden], .preloader__hint[hidden] { display: none; }
.preloader__count, .preloader__status { transition: opacity 500ms var(--ease); }
.preloader__hint { opacity: 0; }

/* 1. is-morph: the title and the counter fade, the frame shrinks to the button, the label and the hint fade in */
.preloader.is-morph .preloader__title, .preloader.is-morph .preloader__count, .preloader.is-morph .preloader__status { opacity: 0; }
.preloader.is-morph .preloader__enter { opacity: 1; transition: opacity 900ms var(--ease) 650ms; }
.preloader.is-morph .preloader__hint { opacity: 1; transition: opacity 900ms var(--ease) 650ms; }
.preloader .btn-frame { border-color: transparent; transition: background 300ms, color 300ms; }
/* 2. is-ready: the button's own border replaces the frame (same box, so nothing is seen to change) */
.preloader.is-ready .preloader__frame { opacity: 0; pointer-events: none; transition: none; }
.preloader.is-ready .preloader__enter { pointer-events: auto; }
.preloader.is-ready .btn-frame { border-color: var(--paper-60); }
.preloader.is-ready .btn-frame:hover { border-color: var(--paper); }
/* 3. is-done (Enter pressed): the button and the hint go first and fast, so nothing is left printed over the hall while the dark fades */
.preloader.is-done .preloader__enter, .preloader.is-done .preloader__hint, .preloader.is-done .preloader__top { opacity: 0; pointer-events: none; transition: opacity 200ms linear; }

/* ---- Reduced motion ---- */
@media (prefers-reduced-motion: reduce) {
  :root { --fade: 1ms; }
  .title__text { transform: none; transition: none; }
  .sound[aria-pressed="true"] .sound__bars i { animation: none; }
  .card:hover .card__img img { transform: none; }
}

/* ---- Small screens ----
   A stop-gap until the phone mockups exist: nothing overlaps and nothing is cut off,
   but this layout has not been designed. */
@media (max-width: 900px) {
  .rail__item:not(.is-current) { display: none; }
  .hint { display: none; }
  .header__logo { font-size: 18px; }
  .title__text { font-size: clamp(34px, 11.5vw, 80px); width: auto !important; max-width: calc(100vw - var(--pad) * 2); }
  .title__label { white-space: normal; }
  .body { left: var(--pad); right: auto; top: 200px; transform: none; width: auto !important; max-width: min(72vw, 320px); }
  .card { top: 76px; padding: 8px; gap: 6px; }
  .card__img { width: 116px; height: 66px; }
  .card__cap { font-size: 10px; }
  .center { white-space: normal; text-align: center; width: calc(100vw - var(--pad) * 2); }
  .overlay { overflow-y: auto; display: flex; flex-direction: column; gap: 24px; padding: 72px var(--pad) 72px; }
  .overlay[hidden] { display: none; }
  .overlay__left, .overlay__figure, .overlay__right, .overlay__note { position: static; transform: none; width: auto; }
  .overlay__title { font-size: 34px; }
  .overlay__note { text-align: left; }
  .sound--overlay { display: none; }
}