/* Cosmology · U|H strand — austere charcoal canvas */

.cosmos-page {
  --c-bg: #0c0c0c;
  --c-ink: #f2f0ea;
  --c-mute: #9a968c;
  --c-rule: rgba(242, 240, 234, 0.22);
  --c-warm: rgba(228, 218, 200, 0.95);
  --c-strand: #c9b896;
  --c-strand-glow: rgba(201, 184, 150, 0.45);
  --c-focus: #e8e0d0;
  background: var(--c-bg);
  color: var(--c-ink);
  min-height: 100dvh;
}

.cosmos-page .site-header {
  background: color-mix(in srgb, var(--c-bg) 92%, transparent);
  border-bottom: 1px solid var(--c-rule);
  position: relative;
  z-index: 5;
}

.cosmos-page .site-mark,
.cosmos-page .site-nav a {
  color: var(--c-ink);
}

.cosmos-hero {
  max-width: 48rem;
  margin: 0 auto;
  padding: 1.75rem clamp(1rem, 4vw, 1.75rem) 0.75rem;
}

.cosmos-hero h1 {
  font-family: var(--font-serif, Georgia, "Times New Roman", serif);
  font-weight: 500;
  font-size: clamp(1.75rem, 4.5vw, 2.6rem);
  line-height: 1.15;
  margin: 0 0 0.65rem;
  color: var(--c-warm);
}

.cosmos-stage-wrap {
  position: relative;
  max-width: 64rem;
  margin: 0 auto;
  padding: 0 clamp(0.75rem, 3vw, 1.5rem) 1.5rem;
}

.cosmos-canvas-shell {
  position: relative;
  border: 1px solid var(--c-rule);
  border-radius: 6px;
  overflow: hidden;
  background:
    radial-gradient(ellipse at 50% 30%, rgba(40, 38, 34, 0.9), transparent 55%),
    #080808;
  box-shadow: inset 0 0 80px rgba(0, 0, 0, 0.55);
}

.cosmos-canvas-shell::after {
  content: "";
  pointer-events: none;
  position: absolute;
  inset: 0;
  opacity: 0.07;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='0.55'/%3E%3C/svg%3E");
  mix-blend-mode: soft-light;
  z-index: 2;
}

#cosmos-canvas {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  max-height: min(70vh, 640px);
  cursor: crosshair;
  touch-action: manipulation;
  position: relative;
  z-index: 1;
}

.cosmos-hud {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1rem;
  align-items: center;
  justify-content: space-between;
  margin: 0.75rem 0 0.5rem;
  font-size: 0.85rem;
  color: var(--c-mute);
}

.cosmos-points {
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.cosmos-points strong {
  color: var(--c-warm);
  font-weight: 600;
}

.cosmos-level-label {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.72rem;
}

.cosmos-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.cosmos-controls button,
.cosmos-panel button,
.cosmos-listen-btn {
  appearance: none;
  border: 1px solid var(--c-rule);
  background: rgba(242, 240, 234, 0.04);
  color: var(--c-ink);
  padding: 0.4rem 0.75rem;
  font: inherit;
  font-size: 0.82rem;
  border-radius: 4px;
  cursor: pointer;
}

.cosmos-controls button:hover,
.cosmos-panel button:hover,
.cosmos-listen-btn:hover {
  border-color: rgba(242, 240, 234, 0.45);
  background: rgba(242, 240, 234, 0.08);
}

.cosmos-controls button:focus-visible,
.cosmos-panel button:focus-visible,
.cosmos-panel a:focus-visible,
.cosmos-hit:focus-visible,
.cosmos-listen-btn:focus-visible {
  outline: 2px solid var(--c-focus);
  outline-offset: 2px;
}

.cosmos-a11y-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.25rem;
  margin: 0.25rem 0 0.75rem;
  font-size: 0.85rem;
  color: var(--c-mute);
}

.cosmos-a11y-bar label {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  cursor: pointer;
}

.cosmos-caption {
  min-height: 1.4em;
  margin: 0.35rem 0 0;
  color: var(--c-warm);
  font-family: var(--font-serif, Georgia, serif);
  font-size: 0.98rem;
  line-height: 1.4;
}

.cosmos-sr {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.cosmos-panels {
  display: grid;
  gap: 1rem;
  margin-top: 1rem;
}

@media (min-width: 720px) {
  .cosmos-panels {
    grid-template-columns: 1.1fr 0.9fr;
  }
}

.cosmos-panel {
  border: 1px solid var(--c-rule);
  border-radius: 6px;
  padding: 1rem 1.1rem 1.15rem;
  background: rgba(255, 255, 255, 0.02);
}

.cosmos-panel h2 {
  margin: 0 0 0.5rem;
  font-size: 0.95rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 560;
  color: var(--c-ink);
}

.cosmos-panel p,
.cosmos-panel li {
  color: var(--c-mute);
  font-size: 0.92rem;
  line-height: 1.45;
}

.cosmos-panel ul {
  margin: 0.35rem 0 0.75rem;
  padding-left: 1.1rem;
}

.cosmos-quiz-q {
  color: var(--c-ink);
  font-family: var(--font-serif, Georgia, serif);
  font-size: 1.05rem;
  margin: 0.35rem 0 0.75rem;
}

.cosmos-quiz-opts {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.cosmos-quiz-opts button {
  text-align: left;
}

.cosmos-quiz-opts button[aria-pressed="true"] {
  border-color: var(--c-strand);
  background: rgba(201, 184, 150, 0.12);
}

.cosmos-quiz-feedback {
  min-height: 1.3em;
  margin: 0.65rem 0 0;
  font-size: 0.88rem;
}

.cosmos-quiz-feedback.is-ok { color: #b7c9a8; }
.cosmos-quiz-feedback.is-no { color: #c9a8a8; }

.cosmos-progress-bar {
  height: 6px;
  border-radius: 999px;
  background: rgba(242, 240, 234, 0.08);
  overflow: hidden;
  margin: 0.55rem 0 0.85rem;
}

.cosmos-progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #6a6358, var(--c-strand));
  transition: width 0.35s ease;
}

.cosmos-page.reduce-motion .cosmos-progress-fill {
  transition: none;
}

.cosmos-unlocks {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.cosmos-unlocks li {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.65rem;
  align-items: baseline;
  padding: 0.45rem 0.55rem;
  border: 1px solid transparent;
  border-radius: 4px;
}

.cosmos-unlocks li.is-locked {
  opacity: 0.55;
  border-color: rgba(242, 240, 234, 0.06);
}

.cosmos-unlocks li.is-open {
  border-color: rgba(201, 184, 150, 0.35);
  background: rgba(201, 184, 150, 0.06);
}

.cosmos-unlocks a {
  color: var(--c-warm);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.cosmos-unlocks .need {
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-mute);
}

.cosmos-hitlist {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.cosmos-hitlist:focus-within,
.cosmos-page.show-hitlist .cosmos-hitlist {
  position: static;
  width: auto;
  height: auto;
  overflow: visible;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0.5rem 0 0;
  padding: 0.35rem 0;
  left: auto;
}

.cosmos-hit {
  appearance: none;
  border: 1px dashed var(--c-rule);
  background: transparent;
  color: var(--c-mute);
  font: inherit;
  font-size: 0.78rem;
  padding: 0.3rem 0.55rem;
  border-radius: 3px;
  cursor: pointer;
}

.cosmos-intro-listen {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin: 0.75rem 0 0;
}

.cosmos-intro-listen audio {
  width: min(100%, 22rem);
  height: 2rem;
}

.cosmos-footer-note {
  max-width: 48rem;
  margin: 0 auto;
  padding: 0.5rem clamp(1rem, 4vw, 1.75rem) 2rem;
  color: var(--c-mute);
  font-size: 0.85rem;
}

@media (prefers-reduced-motion: reduce) {
  .cosmos-page.reduce-motion #cosmos-canvas {
    cursor: pointer;
  }
}

.cosmos-epigraph {
  margin: 0.35rem 0 1rem;
  max-width: 36rem;
  font-family: var(--font-serif, Georgia, serif);
  font-size: clamp(0.95rem, 2vw, 1.1rem);
  line-height: 1.45;
  color: rgba(228, 218, 200, 0.9);
}
.cosmos-readable { font-size: 1.12em; }
.cosmos-readable .cosmos-caption,
.cosmos-readable .cosmos-quiz-q { font-size: 1.15em; }


/* 3D / achievements / fourth-wall */
.cosmos-page.cosmos-3d #cosmos-canvas { cursor: grab; }
.cosmos-page.cosmos-3d #cosmos-canvas:active { cursor: grabbing; }
.cosmos-canvas-shell.cosmos-fourth-wall::before {
  content: "";
  pointer-events: none;
  position: absolute;
  inset: -8%;
  z-index: 3;
  background: radial-gradient(circle at 50% 45%, rgba(232,220,190,0.22), transparent 55%);
  animation: cosmos-fw-flare 0.7s ease-out forwards;
}
@keyframes cosmos-fw-flare {
  0% { opacity: 0; transform: scale(0.92); }
  35% { opacity: 1; transform: scale(1.04); }
  100% { opacity: 0; transform: scale(1.12); }
}
@media (prefers-reduced-motion: reduce) {
  .cosmos-canvas-shell.cosmos-fourth-wall::before { animation: none; opacity: 0; }
}
.cosmos-ach-toast-host {
  position: fixed;
  right: max(0.75rem, env(safe-area-inset-right));
  bottom: max(0.75rem, env(safe-area-inset-bottom));
  z-index: 55;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  pointer-events: none;
}
.cosmos-ach-toast {
  min-width: 14rem;
  max-width: 20rem;
  padding: 0.65rem 0.8rem;
  border: 1px solid rgba(201,184,150,0.45);
  border-radius: 6px;
  background: rgba(12,12,12,0.92);
  color: #f2f0ea;
  box-shadow: 0 10px 30px rgba(0,0,0,0.45);
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.cosmos-ach-toast strong {
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #c9b896;
}
.cosmos-ach-toast.is-out { opacity: 0; transform: translateY(6px); transition: 0.35s ease; }
.cosmos-ach-panel {
  position: fixed;
  inset: 0;
  z-index: 56;
  background: rgba(0,0,0,0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.cosmos-ach-panel[hidden] { display: none !important; }
.cosmos-ach-panel-inner {
  width: min(34rem, 100%);
  max-height: min(80vh, 640px);
  overflow: auto;
  background: #0c0c0c;
  border: 1px solid rgba(242,240,234,0.22);
  border-radius: 8px;
  padding: 1rem 1.1rem 1.2rem;
  color: #f2f0ea;
}
.cosmos-ach-panel header {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}
.cosmos-ach-panel h2 {
  margin: 0;
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: #c9b896;
}
.cosmos-ach-sub { margin: 0; font-size: 0.8rem; color: #9a968c; flex: 1 1 100%; }
.cosmos-ach-head-actions { display: flex; gap: 0.35rem; }
.cosmos-ach-panel button {
  appearance: none;
  border: 1px solid rgba(242,240,234,0.22);
  background: rgba(242,240,234,0.04);
  color: #f2f0ea;
  padding: 0.35rem 0.6rem;
  font: inherit;
  font-size: 0.78rem;
  border-radius: 4px;
  cursor: pointer;
}
.cosmos-ach-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 0.35rem; }
.cosmos-ach-list li {
  display: grid;
  grid-template-columns: 2rem 1fr auto;
  gap: 0.5rem;
  align-items: start;
  padding: 0.45rem 0.5rem;
  border: 1px solid rgba(242,240,234,0.08);
  border-radius: 4px;
}
.cosmos-ach-list li.is-locked { opacity: 0.55; }
.cosmos-ach-list li.is-open {
  border-color: rgba(201,184,150,0.35);
  background: rgba(201,184,150,0.06);
}
.cosmos-ach-list .ach-num { font-variant-numeric: tabular-nums; color: #9a968c; font-size: 0.75rem; }
.cosmos-ach-list .ach-body strong { display: block; font-size: 0.9rem; }
.cosmos-ach-list .ach-body em {
  display: block;
  font-style: normal;
  font-size: 0.78rem;
  color: #9a968c;
  margin-top: 0.15rem;
}
.cosmos-ach-list time { display: block; font-size: 0.68rem; color: #6a665c; margin-top: 0.2rem; }
.cosmos-ach-list .ach-state {
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #9a968c;
}


/* —— Interactive scene still + rail (image.json) —— */
.cosmos-canvas-shell {
  --cosmos-scene-hue: 210;
}

.cosmos-scene-still {
  position: absolute;
  right: 0.65rem;
  bottom: 0.65rem;
  width: min(28%, 220px);
  aspect-ratio: 16 / 10;
  height: auto;
  object-fit: cover;
  object-position: center;
  z-index: 3;
  opacity: 0;
  pointer-events: none;
  border: 1px solid rgba(242, 240, 234, 0.28);
  border-radius: 3px;
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.55);
  filter: saturate(0.9) brightness(0.9);
  transition: opacity 0.45s ease, transform 0.25s ease, border-color 0.2s ease;
  background: #0a0a0a;
}

.cosmos-scene-still.is-ready {
  pointer-events: auto;
}

.cosmos-scene-still.is-shown {
  opacity: 0.92;
}

.cosmos-scene-still.is-fade.is-shown {
  opacity: 0.95;
}

.cosmos-scene-still.is-ready:hover,
.cosmos-scene-still.is-ready:focus-visible {
  border-color: rgba(228, 218, 200, 0.7);
  transform: translateY(-1px);
  outline: none;
}

/* Soft full-bleed wash behind canvas (non-interactive) */
.cosmos-canvas-shell {
  background-image: linear-gradient(
    180deg,
    hsla(var(--cosmos-scene-hue), 18%, 12%, 0.35),
    #080808 70%
  );
}

.cosmos-canvas-shell::before {
  content: "";
  pointer-events: none;
  position: absolute;
  inset: 0;
  z-index: 0;
  background: radial-gradient(
    ellipse at 50% 40%,
    hsla(var(--cosmos-scene-hue), 28%, 28%, 0.22),
    transparent 58%
  );
}

body.reduce-motion .cosmos-scene-still,
body.cosmos-bubble-static .cosmos-scene-still {
  transition: none !important;
}

.cosmos-scene-rail {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 0.75rem 0 0.35rem;
  padding: 0.15rem 0;
}

.cosmos-scene-thumb {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  width: clamp(5.5rem, 14vw, 7.25rem);
  padding: 0;
  border: 1px solid var(--c-rule);
  border-radius: 4px;
  background: rgba(18, 18, 16, 0.92);
  color: var(--c-mute);
  cursor: pointer;
  overflow: hidden;
  text-align: left;
  transition: border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.cosmos-scene-thumb img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  filter: grayscale(0.25) brightness(0.85);
}

.cosmos-scene-thumb-label {
  display: block;
  padding: 0.35rem 0.45rem 0.45rem;
  font-size: 0.65rem;
  letter-spacing: 0.04em;
  line-height: 1.25;
  color: inherit;
}

.cosmos-scene-thumb:hover,
.cosmos-scene-thumb:focus-visible {
  border-color: rgba(228, 218, 200, 0.55);
  color: var(--c-warm);
  outline: none;
}

.cosmos-scene-thumb:focus-visible {
  box-shadow: 0 0 0 2px rgba(232, 224, 208, 0.45);
}

.cosmos-scene-thumb.is-active {
  border-color: rgba(201, 184, 150, 0.75);
  color: var(--c-warm);
  box-shadow: 0 0 0 1px rgba(201, 184, 150, 0.35);
}

.cosmos-scene-thumb.is-active img {
  filter: none;
}

body.reduce-motion .cosmos-scene-thumb {
  transition: none !important;
}