/*
 * /galaxy — the galaxy explorer.
 *
 * The homepage's opening frame, given the whole screen: the coal ground and the
 * galaxy in the hero's own palette (sage for the disc, teal for the young hot stars,
 * warm for the old core), with the same hairline card and mono readout. Values are
 * coal.css's and home-coal.css's, repeated here because this page loads neither: it
 * has no header nav, no reveals and no footer for them to style.
 *
 * One screen, no scroll. The stage fills the viewport and takes every pointer and
 * touch itself (touch-action: none), so the browser never pans or zooms the page; the
 * header and foot sit above it and let pointers through everywhere but their links.
 */

:root {
  --ground: #111214;
  --ink: #eceef0;
  --ink-soft: #9aa0a6;
  --ink-faint: #6b7178;
  --chalk: #f6f7f8;
  --line: rgba(236, 238, 240, 0.14);
  --line-strong: rgba(236, 238, 240, 0.28);
  --accent: #6e8a78;
  --accent-soft: #7e9c89;
  --accent-rgb: 110, 138, 120;
  /* The young hot stars' teal, for the card and reticle when one is picked out. */
  --hot-rgb: 72, 190, 176;
  --font-body: "Inter", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "Chivo Mono", "Courier New", monospace;
  --fs-micro: 0.58rem;
  --gutter: clamp(1rem, 3.2vw, 2.6rem);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  overscroll-behavior: none;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
}

body {
  position: fixed;
  inset: 0;
}

a {
  color: inherit;
}

/* ---------- The stage ---------- */

.stage {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
  cursor: grab;
}

.stage.is-grabbing {
  cursor: grabbing;
}

.stage canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  outline: none;
}

#galaxy-gl {
  opacity: 0;
  transition: opacity 700ms var(--ease);
}

.is-ready #galaxy-gl {
  opacity: 1;
}

#galaxy-overlay {
  pointer-events: none;
}

/* ---------- Header ---------- */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 10;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.5rem;
  padding: calc(1.1rem + env(safe-area-inset-top, 0px)) var(--gutter) 0;
  pointer-events: none;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  flex-wrap: wrap;
}

.masthead,
.byline a {
  pointer-events: auto;
}

.masthead {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
}

.masthead-dot {
  color: var(--accent-soft);
}

.byline {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
  white-space: nowrap;
}

.byline a {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}

.byline a:hover,
.byline a:focus-visible {
  color: var(--ink);
}

/* The live readout: inclination, position angle, zoom and the star count. */
.hud {
  margin: 0.35rem 0 0;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.14em;
  color: var(--ink-faint);
  white-space: pre;
  text-align: right;
}

/* ---------- Foot ---------- */

.foot {
  position: fixed;
  inset: auto 0 0 0;
  z-index: 10;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
  padding: 0 var(--gutter) calc(1.1rem + env(safe-area-inset-bottom, 0px));
  pointer-events: none;
}

.foot-left {
  max-width: 26rem;
}

.caption {
  margin: 0 0 0.8rem;
  font-size: 0.74rem;
  line-height: 1.55;
  color: var(--ink-soft);
}

/*
 * The viewing bands. One band today, so this is a label; galaxy-view.js turns it into
 * a row of buttons as soon as galaxy-bands.js has a second.
 */
.bands {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.band {
  display: inline-flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.38rem 0.6rem 0.4rem;
  border: 1px solid var(--line);
  background: transparent;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.band.is-on {
  border-color: var(--line-strong);
  border-left: 2px solid var(--accent);
  color: var(--ink);
}

button.band {
  pointer-events: auto;
  cursor: pointer;
}

button.band:hover,
button.band:focus-visible {
  color: var(--ink);
  border-color: var(--line-strong);
}

.band-range {
  color: var(--ink-faint);
  letter-spacing: 0.08em;
}

.hint {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  text-align: right;
  transition: opacity 1200ms var(--ease), color 1200ms var(--ease);
}

.hint.is-quiet {
  color: var(--ink-faint);
  opacity: 0.6;
}

.hint-coarse {
  display: none;
}

@media (pointer: coarse) {
  .hint-fine {
    display: none;
  }

  .hint-coarse {
    display: inline;
  }
}

/* ---------- Catalogue card (as the homepage's, in this page's colours) ---------- */

.galaxy-reticle {
  position: absolute;
  top: 0;
  left: 0;
  width: 22px;
  height: 22px;
  border: 1px solid rgba(var(--accent-rgb), 0.9);
  opacity: 0;
  pointer-events: none;
  transition: opacity 160ms var(--ease);
  will-change: transform;
}

.galaxy-reticle.is-hot {
  border-color: rgba(var(--hot-rgb), 0.95);
}

.galaxy-reticle.is-on {
  opacity: 1;
}

.galaxy-card {
  position: absolute;
  top: 0;
  left: 0;
  min-width: 13rem;
  padding: 0.7rem 0.85rem 0.75rem;
  background: rgba(17, 18, 20, 0.86);
  border: 1px solid var(--line-strong);
  border-left: 2px solid var(--accent);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  line-height: 1.55;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 160ms var(--ease);
  will-change: transform;
}

.galaxy-card.is-hot {
  border-left-color: rgb(var(--hot-rgb));
}

.galaxy-card.is-on {
  opacity: 1;
}

.galaxy-card-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.2rem;
  margin-bottom: 0.3rem;
}

.galaxy-card-id {
  color: var(--ink);
  letter-spacing: 0.08em;
}

.galaxy-card-tag {
  font-size: var(--fs-micro);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-soft);
}

.galaxy-card.is-hot .galaxy-card-tag {
  color: rgb(var(--hot-rgb));
}

/* ---------- Without WebGL2, or without JavaScript ---------- */

.fallback {
  position: fixed;
  inset: 0;
  z-index: 5;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0 var(--gutter);
  max-width: 34rem;
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--ink-soft);
}

.fallback[hidden] {
  display: none;
}

.fallback-title {
  margin: 0 0 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink);
}

.fallback a {
  color: var(--ink);
  border-bottom: 1px solid var(--line-strong);
  text-decoration: none;
}

.no-webgl .foot,
.no-webgl .hud {
  display: none;
}

/* ---------- Small screens ---------- */

@media (max-width: 700px) {
  .site-header {
    flex-direction: column;
    gap: 0.2rem;
  }

  .hud {
    text-align: left;
    margin-top: 0.1rem;
  }

  .foot {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.7rem;
  }

  .caption {
    display: none;
  }

  .hint {
    text-align: left;
  }

  .galaxy-card {
    min-width: 0;
    max-width: calc(100vw - 24px);
    font-size: 0.62rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  #galaxy-gl,
  .hint,
  .galaxy-reticle,
  .galaxy-card {
    transition: none;
  }
}