/* ==========================================================================
   Henderson Astronomy — astro.thgnetworks.com
   Shared skin for the thgnetworks.com astronomy family.
   Display: Audiowide   Body/UI: Exo 2   Mono: IBM Plex Mono
   Accent: #2F78BD
   Hero: M31 (Andromeda) fixed background + twinkling starfield canvas +
   a masthead Pleiades asterism. On the light theme the photo and stars
   render as a bright grayscale negative.
   ========================================================================== */

/* ---- tokens: light is the base -------------------------------------------- */
:root {
  --bg:          #eef3f9;
  --panel:       #ffffff;
  --card-bg:     rgba(255, 255, 255, 0.82);
  --panel-2:     #f5f8fc;
  --line:        #c9d5e6;
  --line-soft:   #dde6f1;
  --ink:         #111823;
  --ink-dim:     #3f4a5e;
  --ink-faint:   #6a7688;
  --accent:      #2f78bd;
  --accent-ink:  #ffffff;
  --asterism-ink:#1f5688;         /* darker blue on the light theme */
  --veil:        rgba(240, 244, 250, 0.50);
  --photo-filter:invert(1) grayscale(1) brightness(2);
  --wordmark-glow:none;
  --radius:      14px;
  --maxw:        940px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:          #0a0e16;
    --panel:       #131b28;
    --card-bg:     rgba(17, 24, 37, 0.64);
    --panel-2:     #0f1622;
    --line:        #26324a;
    --line-soft:   #1b2436;
    --ink:         #e9eef8;
    --ink-dim:     #9aa6be;
    --ink-faint:   #606d86;
    --accent:      #2f78bd;
    --accent-ink:  #ffffff;
    --asterism-ink:#7cb8ea;       /* lighter blue on the dark theme */
    --veil:        rgba(6, 10, 20, 0.56);
    --photo-filter:none;
    --wordmark-glow:0 0 40px rgba(47, 120, 189, 0.45), 0 0 90px rgba(47, 120, 189, 0.20);
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg:          #0a0e16;
  --panel:       #131b28;
  --card-bg:     rgba(17, 24, 37, 0.64);
  --panel-2:     #0f1622;
  --line:        #26324a;
  --line-soft:   #1b2436;
  --ink:         #e9eef8;
  --ink-dim:     #9aa6be;
  --ink-faint:   #606d86;
  --accent:      #2f78bd;
  --accent-ink:  #ffffff;
  --asterism-ink:#7cb8ea;
  --veil:        rgba(6, 10, 20, 0.56);
  --photo-filter:none;
  --wordmark-glow:0 0 40px rgba(47, 120, 189, 0.45), 0 0 90px rgba(47, 120, 189, 0.20);
  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg:          #eef3f9;
  --panel:       #ffffff;
  --card-bg:     rgba(255, 255, 255, 0.82);
  --panel-2:     #f5f8fc;
  --line:        #c9d5e6;
  --line-soft:   #dde6f1;
  --ink:         #111823;
  --ink-dim:     #3f4a5e;
  --ink-faint:   #6a7688;
  --accent:      #2f78bd;
  --accent-ink:  #ffffff;
  --asterism-ink:#1f5688;
  --veil:        rgba(240, 244, 250, 0.50);
  --photo-filter:invert(1) grayscale(1) brightness(2);
  --wordmark-glow:none;
  color-scheme: light;
}

/* ---- reset-ish ---------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: "Exo 2", "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--ink);
  background-color: var(--bg);
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

a { color: var(--accent); }
a:hover { text-decoration: none; }

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 0.6rem 1rem;
  border-radius: 0 0 8px 0;
  z-index: 20;
}
.skip:focus { left: 0; }

:where(a, button):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---- fixed background: M31 photo + starfield canvas ------------------- */
.bg-photo {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: url("andromeda.jpg");
  background-position: center center;
  background-size: cover;
  background-repeat: no-repeat;
  filter: var(--photo-filter);
}
.bg-photo::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--veil);
}
#sky {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  display: block;
}

/* ---- masthead asterism (rendered like www.thgnetworks.com) ---------- */
.asterism {
  position: relative;
  z-index: 1;
  display: block;
  width: 235px;
  margin: clamp(1.4rem, 4vw, 2.4rem) auto 0;
  text-decoration: none;
}
.asterism-mark {
  display: block;
  width: 235px;
  aspect-ratio: 2056 / 1755;
  background: var(--asterism-ink);
  -webkit-mask: url("pleiades.png") center / contain no-repeat;
  mask: url("pleiades.png") center / contain no-repeat;
  filter: drop-shadow(0 0 10px rgba(47, 120, 189, 0.38));
  transition: filter 0.3s ease, transform 0.3s ease;
}
.asterism:hover .asterism-mark,
.asterism:focus-visible .asterism-mark {
  filter: drop-shadow(0 0 16px rgba(47, 120, 189, 0.65));
  transform: translateY(-2px);
}
.asterism-tip {
  position: absolute;
  left: 50%;
  top: calc(100% + 8px);
  transform: translateX(-50%) translateY(4px);
  font-family: "Audiowide", "Arial Narrow", sans-serif;
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease, transform 0.3s ease;
}
.asterism:hover .asterism-tip,
.asterism:focus-visible .asterism-tip {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ---- content sits above the sky ------------------------------------- */
.site-head,
main,
.site-foot {
  position: relative;
  z-index: 1;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: clamp(1.1rem, 4vw, 2rem);
}

.site-head {
  padding-top: clamp(1.2rem, 3vw, 2rem);
  padding-bottom: 1.5rem;
}

.head-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.wordmark {
  font-family: "Audiowide", "Arial Narrow", sans-serif;
  font-weight: 400;
  font-size: clamp(1.5rem, 5.5vw, 3rem);
  line-height: 1.14;
  letter-spacing: 0.02em;
  color: var(--accent);
  margin: 0;
  max-width: 18ch;
  overflow-wrap: anywhere;
  text-shadow: var(--wordmark-glow);
}
.wordmark .stop { color: var(--accent); }

.tagline {
  font-family: "Audiowide", "Arial Narrow", sans-serif;
  font-size: clamp(0.78rem, 2vw, 0.98rem);
  letter-spacing: 0.04em;
  color: var(--ink-dim);
  margin: 0.85rem 0 0;
}

.theme-toggle {
  flex: none;
  font-size: 1.05rem;
  line-height: 1;
  width: 2.4rem;
  height: 2.4rem;
  display: grid;
  place-items: center;
  background: var(--card-bg);
  color: var(--ink-dim);
  border: 1px solid var(--line);
  border-radius: 999px;
  cursor: pointer;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: color 0.15s ease, border-color 0.15s ease;
}
.theme-toggle:hover { color: var(--ink); border-color: var(--ink-dim); }

.site-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 1.25rem;
  margin-top: 1.6rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line-soft);
  font-family: "Audiowide", "Arial Narrow", sans-serif;
  font-size: 0.8rem;
  letter-spacing: 0.07em;
}
.site-nav a {
  color: var(--ink-dim);
  text-decoration: none;
  padding-bottom: 0.35rem;
  border-bottom: 2px solid transparent;
}
.site-nav a:hover { color: var(--ink); }
.site-nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--accent);
}
.nav-soon {
  color: var(--ink-faint);
  font-size: 0.8rem;
  letter-spacing: 0.07em;
}
.nav-soon em {
  font-style: normal;
  font-family: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-left: 0.35rem;
}

/* ---- main ------------------------------------------------------------- */
main { padding-top: 2.25rem; padding-bottom: 3rem; }

.intro {
  font-size: clamp(1.05rem, 2.4vw, 1.3rem);
  color: var(--ink-dim);
  max-width: 46ch;
  margin: 0 0 2.5rem;
  text-wrap: balance;
}

.sites {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.15rem;
}

.site {
  background: var(--card-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 1.4rem 1.4rem 1.5rem;
  display: flex;
  flex-direction: column;
}
.site h2 {
  font-family: "Audiowide", "Arial Narrow", sans-serif;
  font-weight: 400;
  font-size: 1.05rem;
  letter-spacing: 0.04em;
  margin: 0 0 0.65rem;
}
.site h2 a { color: var(--ink); text-decoration: none; }
.site h2 a:hover { color: var(--accent); }
.site p {
  margin: 0 0 1.1rem;
  font-size: 0.93rem;
  color: var(--ink-dim);
}
.site .visit {
  margin-top: auto;
  font-family: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: var(--accent);
  text-decoration: none;
}
.site .visit:hover { text-decoration: underline; }

.site.is-soon { border-top-color: var(--line); }
.site.is-soon h2 { color: var(--ink-dim); }
.site.is-soon .visit { color: var(--ink-faint); }

.about {
  margin-top: 3rem;
  padding: 1.5rem 1.4rem;
  background: var(--card-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
}
.about h2 {
  font-family: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 0.9rem;
}
.about p {
  margin: 0;
  max-width: 62ch;
  color: var(--ink-dim);
}

/* ---- footer --------------------------------------------------------- */
.site-foot {
  border-top: 1px solid var(--line);
  padding-top: 1.6rem;
  padding-bottom: 3rem;
  color: var(--ink-dim);
  font-size: 0.85rem;
}
.site-foot p { margin: 0.2rem 0; }
.site-foot a { color: var(--accent); text-decoration: none; }
.site-foot a:hover { text-decoration: underline; }
.site-foot .fine {
  color: var(--ink-faint);
  font-family: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
  .asterism-tip { transition: opacity 0.01s; }
}