/* ============================================================
   The Brown Print — the archive (home)
   Loaded after css/tokens.css and css/site.css (buttons, menu,
   enquiry). The grid, camera and lens are a WebGL canvas drawn
   by js/home-grid.js; this file styles the DOM chrome on top.
   ============================================================ */
:root {
  /* Archive-only layers (cell geometry lives in js/home-grid.js). */
  --z-vignette: 20;
  --z-chrome: 40;
  --z-hint: 42;
  --z-fade: 70;
  --z-preloader: 100;
}

html, body {
  height: 100%;
  min-height: 100dvh;                 /* dvh avoids mobile browser-chrome jump */
  width: 100%;
  /* The red grid backdrop is painted by the WebGL canvas, which covers the
     viewport. Keep the document dark: Android Chrome tints the system
     navigation bar to match, and red bled behind the nav buttons. */
  background: var(--c-bg);
  overflow: hidden;
  overscroll-behavior: none;          /* no pull-to-refresh / rubber-band */
  touch-action: manipulation;         /* removes the 300ms tap delay */
  -webkit-tap-highlight-color: transparent;
}

/* ============================ VIEWPORT ============================ */
.viewport { position: fixed; inset: 0; overflow: hidden; }

/* Captions ride on .glcell (scaled with the camera). --inv = 1 / camera
   scale, set by JS, keeps their small text at its real size. */
.caption {
  position: absolute; left: 40px; bottom: 34px; right: 40px; z-index: 5;
  opacity: 0; transform: translateY(14px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
  pointer-events: none;
}
.caption .kicker {
  display: inline-flex; align-items: center; gap: 10px; margin-bottom: 16px;
  font: 700 calc(var(--fs-label) * var(--inv, 1))/1 var(--f-body); letter-spacing: var(--tr-label); text-transform: uppercase;
  color: var(--c-accent);
}
.caption .kicker::before { content: ""; width: 26px; height: 1px; background: var(--c-accent); }
.caption .title {
  font: 400 66px/.88 var(--f-display); text-transform: uppercase;
  text-shadow: 0 2px 30px rgba(0,0,0,.5);
}
.caption .meta {
  margin-top: 16px; display: flex; gap: 14px; align-items: center; flex-wrap: wrap;
  font-size: calc(var(--fs-label) * var(--inv, 1)); color: var(--c-text-2);
}
.caption .meta .dot { width: 4px; height: 4px; border-radius: 50%; background: var(--c-text-2); opacity: .8; }
.caption .go {
  margin-top: 16px; display: inline-flex; align-items: center; gap: 8px;
  padding: calc(10px * var(--inv, 1)) calc(20px * var(--inv, 1));
  font: 700 calc(var(--fs-label) * var(--inv, 1))/1 var(--f-body); letter-spacing: var(--tr-label); text-transform: uppercase;
  color: var(--c-bg); background: var(--c-accent); border-radius: var(--r-pill);
}
.caption .go span { transition: transform var(--dur-ui) var(--ease); }

.numtag {
  position: absolute; top: 30px; left: 40px; z-index: 5;
  font: 500 calc(13px * var(--inv, 1))/1 var(--f-body); letter-spacing: .16em; font-variant-numeric: tabular-nums;
  color: var(--c-text-2); opacity: 0; transition: opacity .7s var(--ease);
}

/* ================================ CHROME ================================= */
.chrome { position: fixed; inset: 0; pointer-events: none; z-index: var(--z-chrome); }

.topbar {
  position: absolute; top: 0; left: 0; right: 0;
  display: flex; align-items: center; justify-content: space-between; gap: var(--sp-5);
  padding: max(24px, env(safe-area-inset-top)) max(var(--page-margin), env(safe-area-inset-right)) 24px max(var(--page-margin), env(safe-area-inset-left));
  background: linear-gradient(to bottom, rgba(10,9,8,.55) 0%, rgba(10,9,8,0) 100%);
}
.brand { pointer-events: auto; }
.brand .sub { font: italic 400 20px/1 var(--f-voice); letter-spacing: -.01em; color: var(--c-text); white-space: nowrap; }

.archive-nav { display: flex; align-items: center; gap: clamp(16px, 2vw, 32px); pointer-events: auto; }
.archive-nav a {
  position: relative; padding: 12px 0;
  font: 700 var(--fs-nav)/1 var(--f-body); letter-spacing: var(--tr-nav); text-transform: uppercase;
  color: var(--c-text-2); transition: color var(--dur-fast) var(--ease);
}
.archive-nav a::after { content: ""; position: absolute; left: 0; bottom: 6px; width: 0; height: 1px; background: var(--c-accent); transition: width var(--dur-ui) var(--ease); }
.archive-nav a:hover { color: var(--c-text); }
.archive-nav a:hover::after { width: 100%; }
.archive-nav .btn { margin-left: var(--sp-2); background: rgba(10,9,8,.35); }
.archive-nav .btn:hover { background: var(--c-text); }
.menu-btn { pointer-events: auto; flex-shrink: 0; }

/* Rail: the active bar fills over one tour step, so movement is predictable. */
.rail { position: absolute; left: max(var(--page-margin), env(safe-area-inset-left)); top: 50%; transform: translateY(-50%);
  display: flex; flex-direction: column; gap: 6px; pointer-events: auto; }
.rail button { display: flex; align-items: center; gap: 14px; padding: 8px 4px; color: var(--c-text-2); transition: color var(--dur-fast) var(--ease); }
.rail button .idx { width: 30px; text-align: right; font: 500 var(--fs-label)/1 var(--f-body); letter-spacing: var(--tr-meta); font-variant-numeric: tabular-nums; }
.rail button .bar { position: relative; overflow: hidden; width: 26px; height: 2px; background: rgba(246,243,237,.28); transition: width .4s var(--ease); }
.rail button:hover { color: var(--c-text); }
.rail button:hover .bar { width: 40px; }
.rail button.on { color: var(--c-accent); }
.rail button.on .bar { width: 54px; background: rgba(198,166,103,.3); }
.rail button.on .bar::after { content: ""; position: absolute; inset: 0; background: var(--c-accent); transform-origin: left; }
.rail.touring button.on .bar::after { animation: railfill 5s linear; }
@keyframes railfill { from { transform: scaleX(0); } }

.bottombar {
  position: absolute; left: 0; right: 0; bottom: 0;
  display: flex; align-items: flex-end; justify-content: space-between;
  padding: 24px max(var(--page-margin), env(safe-area-inset-right)) max(24px, env(safe-area-inset-bottom)) max(var(--page-margin), env(safe-area-inset-left));
  background: linear-gradient(to top, rgba(10,9,8,.6) 0%, rgba(10,9,8,0) 100%);
}
.credit { max-width: 30ch; pointer-events: auto; font: 500 var(--fs-label)/1.6 var(--f-body); letter-spacing: var(--tr-meta); text-transform: uppercase; color: var(--c-text-2); }

.controls { display: flex; align-items: center; gap: 10px; pointer-events: auto; }
.ctl {
  all: unset; box-sizing: border-box; cursor: pointer; display: inline-flex; align-items: center; gap: 9px;
  height: 48px; padding: 0 20px;
  font: 700 var(--fs-label)/1 var(--f-body); letter-spacing: var(--tr-nav); text-transform: uppercase;
  color: var(--c-text-2); background: rgba(20,16,15,.45);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  border: 1px solid var(--c-line-strong); border-radius: var(--r-pill);
  transition: background-color var(--dur-ui) var(--ease), border-color var(--dur-ui) var(--ease), color var(--dur-ui) var(--ease);
}
.ctl:hover { color: var(--c-text); background: rgba(30,24,22,.6); border-color: var(--c-text); }
.ctl:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 3px; }
.ctl svg { width: 16px; height: 16px; stroke: currentColor; fill: none; stroke-width: 1.6; }
.ctl .state { color: var(--c-accent); }

.hint {
  position: absolute; left: 50%; bottom: 30px; transform: translateX(-50%); z-index: var(--z-hint);
  display: inline-flex; align-items: center; gap: 12px; padding: 11px 24px;
  font: 500 var(--fs-label)/1 var(--f-body); letter-spacing: var(--tr-label); text-transform: uppercase; white-space: nowrap;
  color: var(--c-text-2); background: rgba(20,16,15,.4); -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  border: 1px solid var(--c-line); border-radius: var(--r-pill); pointer-events: none;
}
.hint kbd { font: inherit; padding: 2px 7px; border-radius: var(--r-xs); border: 1px solid var(--c-line-strong); color: var(--c-text); }
.hint .touch-only { display: none; }
@media (pointer: coarse) { .hint .kbd-only { display: none; } .hint .touch-only { display: inline; } }

.sheet { display: none; }

/* ============================ CINEMATIC LAYERS =========================== */
.vignette { position: fixed; inset: 0; z-index: var(--z-vignette); pointer-events: none; background: radial-gradient(120% 120% at 50% 50%, rgba(0,0,0,0) 52%, rgba(0,0,0,.55) 100%); }

.fade { position: fixed; inset: 0; background: var(--c-bg); opacity: 0; pointer-events: none; transition: opacity .6s ease; z-index: var(--z-fade); }
.fade.on { opacity: 1; pointer-events: all; }

/* ============================== PRELOADER =============================== */
.preloader { position: fixed; inset: 0; z-index: var(--z-preloader); background: var(--c-bg); display: grid; place-items: center; transition: opacity .8s var(--ease); }
.preloader.done { opacity: 0; pointer-events: none; }
.pl-inner { text-align: center; }
.pl-word { font: 400 clamp(40px, 7.6vw, 102px)/1 var(--f-display); text-transform: uppercase; letter-spacing: .02em; display: flex; flex-wrap: wrap; justify-content: center; gap: 0 .3em; max-width: 92vw; }
.pl-word .w { display: inline-flex; overflow: hidden; }   /* lines break between words only */
.pl-word .w span { display: inline-block; transform: translateY(110%); animation: rise .9s var(--ease) forwards; }
@keyframes rise { to { transform: translateY(0); } }
.pl-sub { margin-top: 12px; font: italic 400 var(--fs-script)/1.15 var(--f-voice); color: var(--c-accent); opacity: 0; animation: fadeIn .8s ease .5s forwards; }
.pl-bar { margin: 40px auto 0; width: 240px; height: 1px; background: rgba(246,243,237,.15); position: relative; overflow: hidden; }
/* Real progress: js/home-grid.js scales this as textures arrive. */
.pl-bar i { position: absolute; inset: 0; transform-origin: left; background: var(--c-accent); transform: scaleX(0); transition: transform .3s var(--ease); }
.pl-count { margin-top: 18px; font: 500 var(--fs-label)/1 var(--f-body); letter-spacing: .2em; text-transform: uppercase; font-variant-numeric: tabular-nums; color: var(--c-text-2); }
@keyframes fadeIn { to { opacity: 1; } }

.scene { opacity: 0; transition: opacity 1.1s var(--ease); }
.scene.in { opacity: 1; }

/* ============================== RESPONSIVE ============================== */
/* Below 1280 the centred hint and the controls share a row; lift the hint. */
@media (max-width: 1279px) { .hint { bottom: calc(96px + env(safe-area-inset-bottom)); } }
@media (max-width: 1023px) { .archive-nav { display: none; } }

/* Phones: the scaled captions are unreadable, so the active frame's
   caption moves into an unscaled sheet above the controls. */
@media (max-width: 767px) {
  .topbar { padding-top: max(16px, env(safe-area-inset-top)); padding-bottom: 12px; }
  .bottombar { padding-top: 12px; padding-bottom: max(16px, env(safe-area-inset-bottom)); }
  .brand .sub { font-size: 16px; }
  .rail, .credit, .hint, .glcell .caption, .glcell .numtag { display: none; }
  .sheet {
    display: block; position: absolute; pointer-events: auto;
    left: max(var(--page-margin), env(safe-area-inset-left)); right: max(var(--page-margin), env(safe-area-inset-right));
    bottom: calc(80px + env(safe-area-inset-bottom));
    padding: var(--sp-5); border: 1px solid var(--c-line); border-radius: var(--r-lg);
    background: rgba(20,16,15,.82); -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  }
  .sheet .title { margin: var(--sp-2) 0; font: 400 34px/.9 var(--f-display); text-transform: uppercase; }
  .sheet .meta { color: var(--c-text-2); }
  .sheet .btn { width: 100%; margin-top: var(--sp-4); }
  .controls { gap: 8px; }
}
/* Small phones: the sub-label would push the menu button off-screen. */
@media (max-width: 399px) { .brand .sub { display: none; } }

/* Short landscape (phones held sideways): tighten vertical chrome. */
@media (max-height: 480px) and (orientation: landscape) {
  .topbar, .bottombar { padding-top: 10px; padding-bottom: 10px; }
  .caption .title { font-size: 36px; }
  .hint { bottom: 12px; }
}

/* ============================ REDUCED MOTION ============================ */
@media (prefers-reduced-motion: reduce) {
  .pl-word .w span { transform: none; }
  .pl-sub { opacity: 1; }
}