/* ---------- Tokens ---------- */
:root {
  --bg-void: #080b14;
  --bg-panel: #10151f;
  --bg-panel-raised: #161c29;
  --line: #232b3d;
  --text-primary: #eaeef7;
  --text-dim: #7a88a6;
  --accent-oiii: #4fd8c4;
  --accent-star: #f2c572;

  --font-display: "Fraunces", serif;
  --font-body: "Inter", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", monospace;

  --radius: 3px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg-void);
  color: var(--text-primary);
  font-family: var(--font-body);
  min-height: 100%;
}

/* ---------- Starfield backdrop ---------- */
.sky {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-color: var(--bg-void);
  background-image:
    radial-gradient(1px 1px at 10% 20%, rgba(234,238,247,0.5), transparent),
    radial-gradient(1px 1px at 80% 10%, rgba(234,238,247,0.4), transparent),
    radial-gradient(1.5px 1.5px at 60% 70%, rgba(234,238,247,0.5), transparent),
    radial-gradient(1px 1px at 30% 85%, rgba(234,238,247,0.35), transparent),
    radial-gradient(1px 1px at 90% 60%, rgba(234,238,247,0.4), transparent),
    radial-gradient(1.5px 1.5px at 45% 40%, rgba(234,238,247,0.3), transparent),
    radial-gradient(1px 1px at 15% 55%, rgba(234,238,247,0.3), transparent);
  background-repeat: repeat;
  background-size: 400px 400px;
}

/* ---------- Header ---------- */
.site-header {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  padding: 2rem 1.5rem 1.25rem;
  max-width: 1100px;
  margin: 0 auto;
}

.site-header__mark {
  color: var(--accent-star);
  font-size: 1.5rem;
  line-height: 1;
}

.site-header h1 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.6rem;
  margin: 0;
  letter-spacing: 0.01em;
}

.site-header p {
  margin: 0.15rem 0 0;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* ---------- Layout ---------- */
.layout {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 1.5rem;
  align-items: start;
}

/* ---------- Catalog list ---------- */
.catalog__title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin: 0 0 0.75rem 0.25rem;
}

.catalog__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.catalog__item button {
  width: 100%;
  text-align: left;
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--text-primary);
  padding: 0.65rem 0.8rem;
  cursor: pointer;
  font-family: var(--font-body);
  transition: border-color 0.15s ease, background 0.15s ease;
}

.catalog__item button:hover {
  border-color: var(--accent-oiii);
}

.catalog__item button.active {
  background: var(--bg-panel-raised);
  border-color: var(--accent-oiii);
}

.catalog__item .name {
  display: block;
  font-size: 0.92rem;
  font-weight: 500;
}

.catalog__item .cat {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-dim);
  margin-top: 0.15rem;
  letter-spacing: 0.02em;
}

.catalog__item button.active .cat {
  color: var(--accent-oiii);
}

/* ---------- Viewer ---------- */
.viewer {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  min-height: 420px;
}

.viewer__empty {
  padding: 3rem 1.5rem;
  color: var(--text-dim);
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

/* Log strip: catalog-card / FITS-header style data row */
.viewer__log {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem 1rem;
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
  background: var(--bg-panel-raised);
}

.viewer__log dt {
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.62rem;
  margin: 0 0 0.15rem;
}

.viewer__log dd {
  margin: 0;
  color: var(--text-primary);
}

.viewer__image-wrap {
  background: #000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.viewer__image-wrap img {
  width: 100%;
  height: auto;
  max-height: 60vh;
  object-fit: contain;
  display: block;
}

.viewer__body {
  padding: 1.5rem 1.5rem 1.75rem;
}

.viewer__body h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.6rem;
  margin: 0 0 0.6rem;
}

.viewer__body p.desc {
  margin: 0 0 1.1rem;
  line-height: 1.6;
  color: var(--text-primary);
  max-width: 62ch;
}

.viewer__wiki-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-oiii);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease;
}

.viewer__wiki-link:hover {
  border-bottom-color: var(--accent-oiii);
}

/* ---------- Footer ---------- */
.site-footer {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem 1.5rem 2.5rem;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.02em;
}

/* ---------- Accessibility ---------- */
button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--accent-oiii);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}

/* ---------- Responsive: tablet ---------- */
@media (max-width: 860px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .catalog__list {
    flex-direction: row;
    overflow-x: auto;
    padding-bottom: 0.25rem;
    scrollbar-width: thin;
  }

  .catalog__item {
    flex: 0 0 auto;
  }

  .catalog__item button {
    white-space: nowrap;
  }

  .viewer__log {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ---------- Responsive: mobile ---------- */
@media (max-width: 480px) {
  .site-header h1 {
    font-size: 1.3rem;
  }

  .viewer__body h2 {
    font-size: 1.3rem;
  }

  .viewer__log {
    grid-template-columns: repeat(2, 1fr);
    font-size: 0.68rem;
  }
}