/* ==========================================================================
   Deep Sky — design system
   Dark by necessity: astrophotos read wrong against bright surrounds, and the
   site is mostly viewed at night. Every colour is a token so the whole look
   can be re-skinned from :root without touching a component.
   ========================================================================== */

:root {
  /* surfaces — near-black, slightly blue, never pure #000 (crushes shadows) */
  --bg:          #070a12;
  --bg-soft:     #0c111d;
  --bg-mute:     #121829;
  --card:        #0e1422;
  --card-hover:  #141c2e;

  /* ink */
  --ink:         #f2f5fb;   /* headings */
  --text:        #b7c0d4;   /* body */
  --text-2:      #8792ab;
  --muted:       #5d6880;

  /* brand — a star-white/cyan with a deep-space violet accent */
  --brand:       #6ba8ff;
  --brand-dark:  #3d84e8;
  --brand-soft:  rgba(107, 168, 255, 0.12);
  --accent:      #b98cff;
  --accent-soft: rgba(185, 140, 255, 0.12);

  /* narrowband palette — used for object-type chips */
  --ha:          #ff6b6b;
  --oiii:        #4ecdc4;
  --sii:         #ffd166;

  --border:      #1c2437;
  --border-2:    #29344c;

  --shadow-sm:   0 2px 10px rgba(0, 0, 0, 0.4);
  --shadow:      0 18px 40px -16px rgba(0, 0, 0, 0.7);
  --shadow-lg:   0 40px 90px -30px rgba(0, 0, 0, 0.85);
  --glow:        0 0 0 1px var(--brand-soft), 0 0 32px -8px rgba(107, 168, 255, 0.35);

  --radius:      14px;
  --radius-sm:   9px;
  --radius-lg:   22px;
  --container:   1240px;

  --font-head:   'Space Grotesk', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-body:   'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --font-mono:   ui-monospace, 'SF Mono', 'Cascadia Mono', Menlo, monospace;

  --ease:        cubic-bezier(0.22, 1, 0.36, 1);
}

/* --------------------------------------------------------------------------
   reset
   -------------------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.68;
  font-size: 16.5px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

img, svg, video { max-width: 100%; display: block; }
input, button, textarea, select { font: inherit; color: inherit; }
a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--ink); }

h1, h2, h3, h4 {
  font-family: var(--font-head);
  color: var(--ink);
  line-height: 1.18;
  font-weight: 600;
  letter-spacing: -0.02em;
}
h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); }
h2 { font-size: clamp(1.6rem, 3.4vw, 2.3rem); }
h3 { font-size: 1.18rem; }

:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
  border-radius: 4px;
}

/* --------------------------------------------------------------------------
   starfield — a purely decorative background, drawn once with radial-gradients
   so it costs no requests and no JS.
   -------------------------------------------------------------------------- */
.starfield {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-color: var(--bg);
  background-image:
    radial-gradient(1.4px 1.4px at 12% 18%,  rgba(255,255,255,0.85), transparent),
    radial-gradient(1.2px 1.2px at 68% 12%,  rgba(255,255,255,0.65), transparent),
    radial-gradient(1.6px 1.6px at 34% 42%,  rgba(255,255,255,0.75), transparent),
    radial-gradient(1px   1px   at 82% 56%,  rgba(255,255,255,0.55), transparent),
    radial-gradient(1.3px 1.3px at 22% 72%,  rgba(255,255,255,0.7),  transparent),
    radial-gradient(1px   1px   at 91% 84%,  rgba(255,255,255,0.5),  transparent),
    radial-gradient(1.5px 1.5px at 52% 88%,  rgba(255,255,255,0.6),  transparent),
    radial-gradient(1px   1px   at 5%  52%,  rgba(255,255,255,0.45), transparent),
    radial-gradient(1.2px 1.2px at 44% 26%,  rgba(255,255,255,0.55), transparent),
    radial-gradient(1px   1px   at 76% 34%,  rgba(255,255,255,0.4),  transparent),
    /* faint nebulosity */
    radial-gradient(60rem 40rem at 78% 8%,   rgba(185,140,255,0.10), transparent 70%),
    radial-gradient(50rem 36rem at 8%  92%,  rgba(107,168,255,0.09), transparent 70%);
}

/* --------------------------------------------------------------------------
   layout
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}

main { flex: 1 0 auto; }

.section { padding-block: clamp(3.5rem, 8vw, 6rem); }
.section--tight { padding-block: clamp(2.2rem, 5vw, 3.5rem); }

.section-head { margin-bottom: 2.5rem; max-width: 62ch; }
.section-head p { color: var(--text-2); margin-top: 0.7rem; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--brand);
  display: block;
  margin-bottom: 0.7rem;
}

/* --------------------------------------------------------------------------
   header / nav
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(7, 10, 18, 0.78);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  height: 66px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1.06rem;
  color: var(--ink);
  letter-spacing: -0.01em;
  margin-right: auto;
}
.nav-brand svg { width: 26px; height: 26px; color: var(--brand); }
.nav-brand:hover { color: var(--ink); }

.nav-links { display: flex; align-items: center; gap: 0.35rem; }

.nav-links a {
  color: var(--text-2);
  padding: 0.45rem 0.8rem;
  border-radius: var(--radius-sm);
  font-size: 0.94rem;
  transition: color 0.18s, background 0.18s;
}
.nav-links a:hover { color: var(--ink); background: var(--bg-mute); }
.nav-links a[aria-current="page"] { color: var(--ink); background: var(--brand-soft); }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border-2);
  border-radius: var(--radius-sm);
  padding: 0.4rem 0.55rem;
  cursor: pointer;
  color: var(--text);
}

@media (max-width: 780px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute;
    top: 66px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--bg-soft);
    border-bottom: 1px solid var(--border);
    padding: 0.5rem;
    display: none;
  }
  .nav-links.is-open { display: flex; }
  .nav-links a { padding: 0.7rem 0.9rem; }
}

/* --------------------------------------------------------------------------
   buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.72rem 1.35rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-weight: 550;
  font-size: 0.95rem;
  cursor: pointer;
  transition: transform 0.18s var(--ease), background 0.18s, border-color 0.18s, color 0.18s;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn-primary { background: var(--brand); color: #061020; }
.btn-primary:hover { background: #85b8ff; color: #061020; }

.btn-ghost { background: transparent; border-color: var(--border-2); color: var(--text); }
.btn-ghost:hover { background: var(--bg-mute); color: var(--ink); border-color: var(--brand); }

.btn-danger { background: transparent; border-color: #5a2230; color: #ff8a8a; }
.btn-danger:hover { background: rgba(255, 107, 107, 0.12); color: #ffb3b3; }

.btn-sm { padding: 0.42rem 0.85rem; font-size: 0.85rem; }

/* --------------------------------------------------------------------------
   chips — object type + metadata pills
   -------------------------------------------------------------------------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.22rem 0.65rem;
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 550;
  letter-spacing: 0.02em;
  background: var(--bg-mute);
  color: var(--text-2);
  border: 1px solid var(--border);
  white-space: nowrap;
}
.chip::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.9;
}

.chip--galaxy     { color: #c9a0ff; border-color: rgba(201,160,255,0.28); }
.chip--nebula     { color: var(--ha); border-color: rgba(255,107,107,0.28); }
.chip--cluster    { color: var(--sii); border-color: rgba(255,209,102,0.28); }
.chip--planetary  { color: var(--oiii); border-color: rgba(78,205,196,0.28); }
.chip--lunar      { color: #d7dce8; border-color: var(--border-2); }
.chip--solar      { color: #ffb45c; border-color: rgba(255,180,92,0.28); }
.chip--widefield  { color: #8fb8ff; border-color: rgba(143,184,255,0.28); }
.chip--comet      { color: #7ef2c0; border-color: rgba(126,242,192,0.28); }

/* --------------------------------------------------------------------------
   cards + photo grid
   -------------------------------------------------------------------------- */
.grid {
  display: grid;
  gap: 1.35rem;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 320px), 1fr));
}

.photo-card {
  position: relative;
  display: block;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.28s var(--ease), border-color 0.22s, box-shadow 0.28s;
}
.photo-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-2);
  box-shadow: var(--shadow);
}

.photo-card__frame {
  position: relative;
  aspect-ratio: 4 / 3;
  background: var(--bg-mute);
  overflow: hidden;
}
.photo-card__frame img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.5s var(--ease);
}
.photo-card:hover .photo-card__frame img { transform: scale(1.04); }

.photo-card__body { padding: 1rem 1.1rem 1.15rem; }
.photo-card__title {
  font-family: var(--font-head);
  font-size: 1.02rem;
  color: var(--ink);
  font-weight: 600;
  margin-bottom: 0.15rem;
}
.photo-card__desig {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--brand);
  letter-spacing: 0.03em;
}
.photo-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.75rem;
  font-size: 0.78rem;
  color: var(--muted);
}
.photo-card__badge {
  position: absolute;
  top: 0.7rem; left: 0.7rem;
  z-index: 2;
  backdrop-filter: blur(8px);
  background: rgba(7, 10, 18, 0.72);
}

/* --------------------------------------------------------------------------
   data table — acquisition details
   -------------------------------------------------------------------------- */
.data-list {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.05rem 1.5rem;
  font-size: 0.92rem;
}
.data-list dt {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  padding-block: 0.55rem;
  border-bottom: 1px solid var(--border);
}
.data-list dd {
  color: var(--text);
  padding-block: 0.55rem;
  border-bottom: 1px solid var(--border);
}
.data-list dd:last-of-type, .data-list dt:last-of-type { border-bottom: none; }

@media (max-width: 560px) {
  .data-list { grid-template-columns: 1fr; gap: 0; }
  .data-list dt { border-bottom: none; padding-bottom: 0; }
}

/* --------------------------------------------------------------------------
   panels / forms
   -------------------------------------------------------------------------- */
.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(1.2rem, 3vw, 1.85rem);
}

.field { margin-bottom: 1rem; }
.field label {
  display: block;
  font-size: 0.82rem;
  font-weight: 550;
  color: var(--text-2);
  margin-bottom: 0.35rem;
}
.field .hint { font-size: 0.76rem; color: var(--muted); margin-top: 0.3rem; }

input[type="text"], input[type="url"], input[type="number"],
input[type="date"], input[type="file"], textarea, select {
  width: 100%;
  background: var(--bg-soft);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-sm);
  padding: 0.62rem 0.8rem;
  color: var(--ink);
  transition: border-color 0.18s, box-shadow 0.18s;
}
input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px var(--brand-soft);
}
textarea { resize: vertical; min-height: 96px; line-height: 1.6; }
::placeholder { color: var(--muted); }

.field-row {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr));
}

/* --------------------------------------------------------------------------
   notices
   -------------------------------------------------------------------------- */
.notice {
  border-radius: var(--radius-sm);
  padding: 0.8rem 1rem;
  font-size: 0.9rem;
  border: 1px solid var(--border-2);
  background: var(--bg-mute);
}
.notice--ok   { border-color: rgba(78,205,196,0.35);  background: rgba(78,205,196,0.08);  color: #a6ede7; }
.notice--err  { border-color: rgba(255,107,107,0.35); background: rgba(255,107,107,0.08); color: #ffb3b3; }
.notice--info { border-color: rgba(107,168,255,0.3);  background: var(--brand-soft);      color: #bcd6ff; }

/* --------------------------------------------------------------------------
   footer
   -------------------------------------------------------------------------- */
.site-footer {
  flex-shrink: 0;
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
  padding-block: 2.2rem;
  margin-top: 4rem;
  font-size: 0.88rem;
  color: var(--muted);
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  align-items: center;
  justify-content: space-between;
}
.footer-links { display: flex; gap: 1.2rem; flex-wrap: wrap; }
.site-footer a { color: var(--text-2); }
.site-footer a:hover { color: var(--brand); }

/* --------------------------------------------------------------------------
   utilities
   -------------------------------------------------------------------------- */
.stack   { display: flex; flex-direction: column; }
.row     { display: flex; align-items: center; }
.gap-sm  { gap: 0.5rem; }
.gap     { gap: 1rem; }
.wrap    { flex-wrap: wrap; }
.mt      { margin-top: 1rem; }
.mt-lg   { margin-top: 2rem; }
.center  { text-align: center; }
.muted   { color: var(--muted); }
.mono    { font-family: var(--font-mono); }
.hidden  { display: none !important; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--brand);
  color: #061020;
  padding: 0.6rem 1rem;
  z-index: 100;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus { left: 0; }

.empty-state {
  text-align: center;
  padding: 4rem 1rem;
  color: var(--muted);
}
.empty-state svg { width: 44px; height: 44px; margin: 0 auto 1rem; opacity: 0.5; }

.spinner {
  width: 20px; height: 20px;
  border: 2px solid var(--border-2);
  border-top-color: var(--brand);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }