/* Infinite — Art Gallery museum. Tokens follow style.css (paper / ink / accent, Geist). */
:root {
  --paper: #EEF0F6;
  --bg: #12162B;
  --ink: #EEF0F6;
  --ink2: #A3A9BA;
  --muted: #8C93A8;
  --line: var(--glass-edge);
  --accent: #F57F66;
  --brand-grad: linear-gradient(90deg, #F57F66, #D99A9C 35%, #C7AFC0 65%, #A9CDF1);
  --hand: 'Caveat', cursive;
  --font-sans: 'Geist', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'Geist Mono', ui-monospace, Menlo, Monaco, monospace;
  --font-hand: 'Caveat', cursive;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-io: cubic-bezier(0.65, 0, 0.35, 1);
  --glass: rgba(255, 255, 255, 0.10);
  --glass-edge: rgba(255, 255, 255, 0.22);
  --glass-hi: inset 0 1px 0 rgba(255, 255, 255, 0.25), inset 0 -1px 0 rgba(255, 255, 255, 0.03);
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35), var(--glass-hi);
}

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

html, body {
  height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  overflow: hidden;
  overscroll-behavior: none;
  -webkit-font-smoothing: antialiased;
}

.sr-only {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap;
}

#stage {
  position: fixed; inset: 0; width: 100%; height: 100%;
  display: block; touch-action: none; outline: none;
  cursor: grab;
}
#stage.grabbing { cursor: grabbing; }
#stage.pointing { cursor: pointer; }

.vignette {
  position: fixed; inset: 0; pointer-events: none;
  background: radial-gradient(120% 90% at 50% 50%, transparent 55%, rgba(5, 8, 22, 0.45) 100%);
}

/* ---- opening ---- */
.intro {
  position: fixed; inset: 0; z-index: 30; pointer-events: none;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px;
  background: var(--bg);
  transition: opacity 1.1s var(--ease-io) 0.15s, visibility 0s linear 1.3s;
}
.intro-eyebrow { font: 500 12px/1 var(--font-mono); letter-spacing: 0.04em; text-transform: lowercase; color: var(--muted); }
.intro-title { font: 600 clamp(2.6rem, 9vw, 5.4rem)/1 var(--font-sans); letter-spacing: -0.04em; color: var(--ink); }
.intro-bar { width: 120px; height: 2px; border-radius: 2px; background: var(--line); overflow: hidden; margin-top: 18px; }
.intro-bar i { display: block; width: 100%; height: 100%; background: var(--brand-grad); transform: scaleX(0); transform-origin: left; transition: transform 0.4s var(--ease-out); }
body:not(.is-loading) .intro { opacity: 0; visibility: hidden; }

/* ---- chips ---- */
.chip {
  position: fixed; z-index: 10;
  display: flex; align-items: center; gap: 8px;
  background: var(--glass);
  -webkit-backdrop-filter: blur(22px) saturate(1.8); backdrop-filter: blur(22px) saturate(1.8);
  border: 1px solid var(--line); border-radius: 999px;
  box-shadow: var(--shadow);
  color: var(--ink); text-decoration: none;
  font: 500 13px/1 var(--font-sans);
  padding: 9px 15px 9px 12px;
  transition: transform 0.3s var(--ease-out), background 0.3s, opacity 0.5s var(--ease-io);
}
.chip svg { width: 15px; height: 15px; }
.back { top: max(18px, env(safe-area-inset-top)); left: 18px; }
.back:hover { transform: translateY(-1px); background: rgba(255, 255, 255, 0.2); }

.counter {
  top: max(18px, env(safe-area-inset-top)); right: 18px;
  padding: 9px 14px; gap: 5px;
  font: 500 12px/1 var(--font-mono); letter-spacing: 0.04em;
  opacity: 0; pointer-events: none; transform: translateY(-6px);
}
.counter em { font-style: normal; color: var(--muted); }
body.is-focus .counter { opacity: 1; transform: none; }

/* ---- mode switch ---- */
.modes {
  position: fixed; z-index: 10; left: 50%; bottom: max(26px, calc(env(safe-area-inset-bottom) + 14px));
  transform: translateX(-50%);
  display: flex; padding: 4px; gap: 0;
  background: var(--glass);
  -webkit-backdrop-filter: blur(22px) saturate(1.8); backdrop-filter: blur(22px) saturate(1.8);
  border: 1px solid var(--line); border-radius: 999px; box-shadow: var(--shadow);
  transition: opacity 0.5s var(--ease-io), transform 0.6s var(--ease-out);
}
.modes .thumb {
  position: absolute; top: 4px; bottom: 4px; left: 0; width: 0;
  border-radius: 999px; background: var(--brand-grad); box-shadow: 0 2px 14px rgba(245, 127, 102, 0.3);
  transition: transform 0.55s var(--ease-out), width 0.55s var(--ease-out);
  pointer-events: none;
}
.modes button {
  position: relative; z-index: 1;
  display: flex; align-items: center; gap: 8px;
  border: 0; background: none; cursor: pointer;
  font: 500 13px/1 var(--font-sans); color: var(--ink2);
  padding: 11px 18px 11px 14px; border-radius: 999px;
  transition: color 0.35s var(--ease-io);
  -webkit-tap-highlight-color: transparent;
}
.modes button svg { width: 17px; height: 17px; }
.modes button.on { color: #1F1D1A; }
.modes button:not(.on):hover { color: var(--ink); }
.modes button:focus-visible, .round:focus-visible, .chip:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
body.is-focus .modes { opacity: 0; pointer-events: none; transform: translate(-50%, 14px); }

.hint {
  position: fixed; z-index: 9; left: 50%; bottom: max(30px, calc(env(safe-area-inset-bottom) + 18px));
  transform: translate(-50%, 6px);
  font: 500 11px/1.4 var(--font-mono); letter-spacing: 0.04em; text-transform: lowercase;
  color: var(--ink); text-align: center; white-space: nowrap;
  padding: 9px 16px; border-radius: 999px; background: var(--glass); border: 1px solid var(--glass-edge); box-shadow: var(--shadow);
  -webkit-backdrop-filter: blur(22px) saturate(1.8); backdrop-filter: blur(22px) saturate(1.8);
  opacity: 0; pointer-events: none;
  transition: opacity 0.7s var(--ease-io), transform 0.7s var(--ease-out);
}
.hint.show { opacity: 1; transform: translate(-50%, 0); }
body.is-focus .hint { opacity: 0 !important; }

/* ---- close-up ---- */
.plaque {
  position: fixed; z-index: 10; left: 24px; bottom: max(26px, env(safe-area-inset-bottom) + 14px);
  max-width: min(320px, calc(100vw - 48px));
  background: var(--glass);
  -webkit-backdrop-filter: blur(22px) saturate(1.8); backdrop-filter: blur(22px) saturate(1.8);
  border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow);
  padding: 16px 20px 17px;
  opacity: 0; transform: translateY(14px); pointer-events: none;
  transition: opacity 0.5s var(--ease-io), transform 0.7s var(--ease-out);
}
.plaque-no { font: 500 11px/1 var(--font-mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent); }
.plaque-title { font: 700 40px/0.9 var(--hand); margin-top: 8px; }
.plaque-meta { font: 400 12px/1.4 var(--font-mono); color: var(--muted); margin-top: 8px; letter-spacing: 0.02em; }
body.is-focus .plaque { opacity: 1; transform: none; transition-delay: 0.25s, 0.25s; }

.focus-ui {
  position: fixed; z-index: 10; right: 24px; bottom: max(26px, env(safe-area-inset-bottom) + 14px);
  display: flex; gap: 10px;
  opacity: 0; transform: translateY(14px); pointer-events: none;
  transition: opacity 0.5s var(--ease-io), transform 0.7s var(--ease-out);
}
body.is-focus .focus-ui { opacity: 1; transform: none; pointer-events: auto; transition-delay: 0.25s, 0.25s; }
.round {
  width: 46px; height: 46px; border-radius: 50%;
  display: grid; place-items: center; cursor: pointer;
  background: var(--glass);
  -webkit-backdrop-filter: blur(22px) saturate(1.8); backdrop-filter: blur(22px) saturate(1.8);
  border: 1px solid var(--line); box-shadow: var(--shadow); color: var(--ink);
  transition: transform 0.3s var(--ease-out), background 0.3s;
  -webkit-tap-highlight-color: transparent;
}
.round svg { width: 18px; height: 18px; }
.round:hover { background: rgba(255, 255, 255, 0.2); transform: translateY(-2px); }
.round:active { transform: scale(0.94); }
.round.close { background: var(--brand-grad); color: #1F1D1A; border-color: transparent; }
.round.close:hover { filter: brightness(1.08); }

/* ---- plain gallery (crawlers, no-WebGL) ---- */
.plain { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); }
body.nogl { overflow: auto; }
body.nogl #stage, body.nogl .vignette, body.nogl .modes, body.nogl .hint, body.nogl .intro { display: none; }
body.nogl .plain {
  position: static; width: auto; height: auto; clip: auto; clip-path: none; overflow: visible;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px;
  padding: 76px 16px 32px;
}
body.nogl .plain img { width: 100%; height: auto; display: block; border-radius: 6px; }

@media (max-width: 640px) {
  .back { left: 14px; }
  .counter { right: 14px; }
  .modes button { padding: 11px 13px 11px 11px; font-size: 12px; gap: 6px; }
  .modes button svg { width: 16px; height: 16px; }
  .plaque { left: 14px; right: 14px; max-width: none; bottom: calc(max(26px, env(safe-area-inset-bottom) + 14px) + 58px); padding: 14px 16px 15px; }
  .plaque-title { font-size: 34px; }
  .focus-ui { left: 14px; right: 14px; justify-content: space-between; }
  .focus-ui .close { order: 3; }
  .hint { font-size: 10px; white-space: normal; width: 80vw; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.15s !important; transition-delay: 0s !important; }
}