/* Hallmark · pre-emit critique: P4 H4 E4 S5 R5 V4
 * Existing observatory theme · Earth preview and typography have separate space.
 */
html,
body {
  overflow-x: clip;
}

.launch-deck,
.launch-deck * {
  box-sizing: border-box;
}

.launch-deck {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  overflow-y: auto;
  overflow-x: clip;
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.5;
  pointer-events: none;
  overscroll-behavior: contain;
}

/* The narrow composition is taller than the viewport, so the deck must own
   pointer input in every browser to remain a usable scroll container. The
   wide composition still passes sky drags through to the canvas. */
@media not all and (min-width: 60rem) {
  .launch-deck {
    pointer-events: auto;
  }
}

.launch-deck::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background: var(--color-space);
  pointer-events: none;
}

.launch-deck[hidden] {
  display: none;
}

.launch-deck a {
  color: inherit;
}

.observatory-nav,
.observatory-intro,
.study-index,
.observatory-footer {
  pointer-events: auto;
}

.observatory-nav {
  position: relative;
  z-index: var(--z-sticky);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: max(var(--space-md), env(safe-area-inset-top)) var(--page-gutter) var(--space-md);
  background: var(--color-space);
}

.observatory-wordmark {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  min-height: 2.75rem;
  font-family: var(--font-label);
  font-size: var(--text-sm);
  letter-spacing: 0.16em;
  white-space: nowrap;
  text-decoration: none;
  text-transform: uppercase;
}

.observatory-mark {
  position: relative;
  width: 1.5rem;
  height: 1rem;
  flex: none;
  border: var(--rule-hair) solid color-mix(in oklch, var(--color-accent-2), transparent 42%);
  border-radius: 50%;
  transform: rotate(-34deg);
  transition: border-color var(--dur-short) var(--ease-out);
}

.observatory-mark::before {
  content: "";
  position: absolute;
  inset: 50% auto auto 0.33rem;
  width: 0.43rem;
  height: 0.43rem;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  box-shadow: 0 0 0 var(--space-3xs) var(--color-accent-soft);
  transform: translateY(-50%);
}

.observatory-mark::after {
  content: "";
  position: absolute;
  inset: -0.17rem 0.07rem auto auto;
  width: 0.31rem;
  height: 0.31rem;
  border: var(--rule-hair) solid var(--color-paper);
  border-radius: var(--radius-pill);
  background: var(--color-accent-2);
}

.observatory-wordmark:hover .observatory-mark,
.observatory-wordmark:focus-visible .observatory-mark {
  border-color: var(--color-accent);
}

.observatory-map {
  min-height: calc(100dvh - 4.75rem);
  padding: var(--space-md) var(--page-gutter) var(--space-lg);
}

.observatory-intro {
  max-width: 37rem;
  padding: var(--space-md) 0 0;
  animation: observatory-arrive var(--dur-long) var(--ease-out) both;
}

.observatory-kicker,
.study-index-label,
.observatory-hint,
.map-legend,
.observatory-footer {
  font-family: var(--font-label);
  font-size: var(--text-xs);
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.observatory-kicker {
  margin: 0 0 var(--space-md);
  color: var(--color-accent);
}

.observatory-intro h1 {
  min-width: 0;
  max-width: 17ch;
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--text-display);
  font-weight: 300;
  font-style: normal;
  line-height: 0.96;
  letter-spacing: -0.038em;
  overflow-wrap: anywhere;
  text-wrap: balance;
}

.observatory-lede {
  max-width: 34rem;
  margin: var(--space-lg) 0 0;
  color: var(--color-ink-2);
  font-size: var(--text-md);
  font-weight: 300;
  line-height: 1.38;
}

.observatory-hint {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin: var(--space-md) 0 0;
  color: var(--color-muted);
  letter-spacing: 0.06em;
}

.observatory-viewport {
  position: relative;
  height: clamp(17rem, 70vw, 28rem);
  margin-block: var(--space-sm);
  pointer-events: auto;
}

.observatory-actions,
.observatory-scroll {
  display: none;
  text-decoration: none;
}

/* Phones: the composition stacks, so the hero must hand over a choice inside
   the first screen. The copy tightens, a primary action launches the first
   study directly, and the Earth preview yields height so the study list
   starts at the fold instead of a full screen below it. */
@media not all and (min-width: 60rem) {
  .observatory-nav {
    padding-block: max(var(--space-xs), env(safe-area-inset-top)) var(--space-xs);
  }

  .observatory-map {
    padding-block-start: var(--space-xs);
  }

  .observatory-intro {
    padding-block-start: 0;
  }

  .observatory-kicker {
    margin-block-end: var(--space-xs);
  }

  .observatory-lede {
    margin-block-start: var(--space-sm);
  }

  .observatory-intro > p.observatory-hint {
    display: none;
  }

  .observatory-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-2xs) var(--space-sm);
    margin-block-start: var(--space-md);
  }

  .launch-deck .observatory-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    min-height: 3rem;
    padding: 0 var(--space-md);
    background: var(--color-accent);
    color: var(--color-accent-ink);
    font-family: var(--font-label);
    font-size: var(--text-sm);
    letter-spacing: 0.11em;
    text-transform: uppercase;
    text-decoration: none;
    transition: background-color var(--dur-short) var(--ease-out);
  }

  .observatory-cta:active {
    background: var(--color-accent-deep);
  }

  .launch-deck .observatory-scroll {
    display: inline-flex;
    gap: var(--space-2xs);
    min-height: 3rem;
    margin: 0;
    color: var(--color-accent);
  }

  .launch-deck .observatory-scroll span {
    width: auto;
    height: auto;
    background: none;
  }

  .observatory-viewport {
    height: clamp(11rem, min(70vw, 38svh), 28rem);
    margin-block: var(--space-xs);
  }

  .study-index {
    margin-block-start: var(--space-md);
  }

  /* The preview shares the page's scroll gesture. Opening Light Study
     restores the canvas controls for hands-on exploration. */
  body:not(.is-study-open) #canvas-container {
    pointer-events: none;
  }

  .study-index {
    scroll-margin-top: var(--space-md);
  }
}

@media (max-width: 39.999rem) {
  .observatory-intro h1 {
    max-width: none;
    font-size: clamp(1.65rem, 8.6vw, 2.65rem);
  }

  .observatory-lede {
    font-size: var(--text-base);
  }
}

body:not(.is-study-open) #canvas-container {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  /* Stars gently disappear into the surrounding sky without a panel edge. */
  mask-image: radial-gradient(ellipse closest-side, black 72%, transparent 100%);
}

body:not(.is-study-open) #canvas-container canvas {
  display: block;
  touch-action: none;
}

.observatory-hint span {
  display: grid;
  width: 1.8rem;
  height: 1.8rem;
  place-items: center;
  border-radius: var(--radius-pill);
  background: var(--color-paper-3);
  color: var(--color-accent);
}

.study-index {
  max-width: 30rem;
  margin-block-start: var(--space-xl);
}

.study-index-label {
  margin: 0 0 var(--space-sm);
  color: var(--color-muted);
}

.study-index ol {
  display: grid;
  gap: var(--space-2xs);
  margin: 0;
  padding: 0;
  list-style: none;
}

.study-index li {
  min-width: 0;
}

.study-index a {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-md);
  min-height: 4rem;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-paper-2);
  text-decoration: none;
  transition: background-color var(--dur-short) var(--ease-out), color var(--dur-short) var(--ease-out);
}

.study-index .is-current a {
  background: var(--color-paper-3);
  box-shadow: inset var(--rule-heavy) 0 0 var(--color-accent);
}

.study-number {
  color: var(--color-muted);
  font-family: var(--font-label);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
}

.is-current .study-number,
.is-current .study-arrow {
  color: var(--color-accent);
}

.study-name {
  min-width: 0;
  display: grid;
  gap: var(--space-3xs);
}

.study-name strong {
  min-width: 0;
  font-family: var(--font-display);
  font-size: var(--text-md);
  font-weight: 400;
  line-height: 1;
  overflow-wrap: anywhere;
}

.study-name small {
  overflow: hidden;
  color: var(--color-muted);
  font-family: var(--font-label);
  font-size: var(--text-xs);
  letter-spacing: 0.03em;
  line-height: 1.2;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.study-arrow {
  color: var(--color-ink-2);
  font-family: var(--font-label);
  transition: color var(--dur-short) var(--ease-out), transform var(--dur-short) var(--ease-out);
}

.map-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-block-start: var(--space-xl);
  color: var(--color-muted);
}

.map-legend span {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
}

.map-legend i {
  width: 0.42rem;
  height: 0.42rem;
  border-radius: var(--radius-pill);
  background: var(--color-ink-2);
}

.map-legend .legend-sun {
  background: var(--color-accent);
}

.map-legend .legend-earth {
  background: var(--color-accent-2);
}

.observatory-footer {
  padding: 0 var(--page-gutter) max(var(--space-md), env(safe-area-inset-bottom));
  color: var(--color-muted);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 300;
  letter-spacing: 0;
  line-height: 1.4;
  text-transform: none;
}

.observatory-footer p {
  margin: 0;
}

.observatory-credit-band {
  display: grid;
  grid-template-columns: minmax(13rem, 1.3fr) minmax(7rem, 0.7fr);
  align-items: center;
  gap: var(--space-lg);
  padding: var(--space-sm) 0;
  border-top: var(--rule-hair) solid var(--color-rule);
}

.observatory-credit-group {
  display: grid;
  gap: var(--space-3xs);
}

.observatory-credit-label {
  font-family: var(--font-label);
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.observatory-credit-links,
.observatory-credit-note {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 300;
  letter-spacing: 0;
  line-height: 1.35;
  text-transform: none;
}

.observatory-credit-label {
  color: var(--color-muted);
}

.observatory-credit-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0 var(--space-xs);
  color: var(--color-muted);
}

.observatory-credit-links a {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  text-decoration-color: currentColor;
  text-underline-offset: 0.2em;
}

.observatory-credit-links a:hover,
.observatory-credit-links a:focus-visible {
  color: var(--color-accent);
  text-decoration-color: currentColor;
}

.observatory-credit-note {
  padding-top: var(--space-xs);
  border-top: var(--rule-hair) solid var(--color-rule);
  color: var(--color-muted);
}

.launch-deck :focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: var(--space-2xs);
}

.study-index a:active .study-arrow {
  transform: translate(0.1rem, -0.1rem);
}

.study-index a[aria-disabled="true"] {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}

body:not(.is-study-open) > .header,
body:not(.is-study-open) > .info-panel,
body:not(.is-study-open) > .side-rail,
body:not(.is-study-open) > .controls,
body:not(.is-study-open) > .hint,
body:not(.is-study-open) > .label-3d,
body:not(.is-study-open) > .scene-nav,
body:not(.is-study-open) > .loader {
  opacity: 0 !important;
  visibility: hidden;
  pointer-events: none;
}

.noscript-loader {
  z-index: calc(var(--z-modal) + 1);
}

.noscript-loader .loader-text {
  animation: none;
}

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

@media (hover: hover) and (pointer: fine) {
  .study-index a:hover .study-arrow,
  .study-index a:focus-visible .study-arrow {
    transform: translate(0.16rem, -0.16rem);
  }

  .study-index a:hover,
  .study-index a:focus-visible {
    background: var(--color-paper-3);
  }
}

@media (min-width: 40rem) {
  .observatory-map {
    padding-block-start: var(--space-2xl);
  }

  .study-index ol {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 59.999rem) {
  .observatory-credit-band {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

}

@media (max-width: 34rem) {
  .observatory-credit-band {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
    gap: var(--space-sm);
    padding-block: var(--space-xs);
  }

  .observatory-credit-group {
    gap: 0;
  }
}

@media (min-width: 60rem) {
  .launch-deck {
    overflow: hidden;
  }

  .launch-deck::before {
    background: var(--color-space);
  }

  .observatory-nav {
    position: fixed;
    inset: 0 0 auto;
    background: var(--color-transparent);
  }

  .observatory-map {
    position: fixed;
    inset: 0;
    min-height: 0;
    padding: 0;
  }

  .observatory-intro {
    position: absolute;
    inset-inline-start: var(--page-gutter);
    inset-block-end: clamp(7.5rem, 12dvh, 9.5rem);
    width: min(34vw, 32rem);
    padding: 0;
  }

  .observatory-intro h1 {
    max-width: 12ch;
    font-size: clamp(3rem, 4.4vw, 5.2rem);
  }

  .observatory-viewport {
    position: absolute;
    inset: 20% 28% 23% 36%;
    height: auto;
    margin: 0;
  }

  .study-index {
    position: absolute;
    inset-inline-end: var(--page-gutter);
    inset-block-start: 5rem;
    inset-block-end: 6.5rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    justify-content: safe center;
    width: min(25vw, 27rem);
    max-width: none;
    margin: 0;
    overflow-x: hidden;
    overflow-y: auto;
  }

  .study-index ol {
    grid-template-columns: minmax(0, 1fr);
  }

  .study-index a {
    background: var(--color-overlay-soft);
  }

  .map-legend {
    position: absolute;
    inset-inline-start: 52%;
    inset-block-end: 6.5rem;
    margin: 0;
    transform: translateX(-50%);
  }

  .observatory-footer {
    position: fixed;
    inset: auto 0 0;
    padding-block-start: 0;
    background: linear-gradient(180deg, var(--color-transparent), var(--color-overlay-soft) 18%);
  }
}

@media (min-width: 90rem) {
  .study-index {
    width: min(25vw, 28rem);
  }

  .observatory-intro {
    width: min(34vw, 40rem);
  }
}

@media (pointer: coarse) {
  .launch-deck a {
    min-height: 3rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .observatory-intro {
    animation: none;
  }

  .study-index a,
  .study-arrow {
    transition-duration: 150ms;
  }

  .study-index a:hover .study-arrow,
  .study-index a:focus-visible .study-arrow {
    transform: none;
  }
}

@keyframes observatory-arrive {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* The route's original study keeps its established typography after entry. */
body,
.rail-btn,
.header,
.info-panel,
.controls,
.toggle-btn {
  font-family: var(--font-body);
}

#save-view-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

#save-view-btn svg {
  width: 12px;
  height: 12px;
  flex: none;
}

#save-view-btn:disabled {
  opacity: 0.55;
  cursor: wait;
}

.brand,
.subtitle,
.header-meta,
.info-label,
.fact-key,
.fact-callout .fact-tag,
.speed-label,
.speed-value,
.label-3d,
.loader-text,
.scene-nav {
  font-family: var(--font-label);
}

.title,
.info-title,
.rail-btn em {
  font-style: normal;
}

/* The launch deck paints without starting a WebGL context. */
.earth-preview {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  mask-image: radial-gradient(ellipse closest-side, #000 88%, transparent 100%);
}