.deep-sky-page { background: radial-gradient(circle at 80% 4%, rgba(74, 158, 255, .16), transparent 34rem), var(--bg); }
.deep-sky-container { width: 100%; min-width: 0; max-width: 1540px; }

.deep-sky-hero { max-width: 900px; padding: 1.4rem 0 1rem; }
.deep-sky-hero h1 { margin: .15rem 0 .55rem; font-size: clamp(2.3rem, 6vw, 5rem); line-height: .95; letter-spacing: -.05em; }
.deep-sky-hero > p:last-child { color: var(--text-muted); font-size: clamp(.92rem, 1.5vw, 1.1rem); }
.atlas-explainer { margin-bottom: 1rem; border: 1px solid var(--border); border-radius: 8px; background: rgba(15, 21, 36, .8); }
.atlas-explainer-bar { display: grid; grid-template-columns: 1fr auto; align-items: center; }
.atlas-explainer-bar > button { display: flex; justify-content: space-between; align-items: center; width: 100%; padding: .75rem 1rem; color: var(--text); text-align: left; background: transparent; border: 0; cursor: pointer; }
.atlas-explainer-bar > button span:first-child { display: grid; }
.atlas-explainer-bar > button small { color: var(--text-muted); }
.atlas-explainer-bar > button span:last-child { color: var(--accent); font-size: 1.4rem; }
.atlas-explainer-bar > a { margin-right: .8rem; padding: .45rem .65rem; color: var(--accent); border: 1px solid rgba(74,158,255,.35); border-radius: 5px; text-decoration: none; font-size: .72rem; white-space: nowrap; }
#atlas-explainer-content { grid-template-columns: repeat(4, 1fr); gap: .7rem; padding: 0 1rem 1rem; }
#atlas-explainer-content:not([hidden]) { display: grid; }
#atlas-explainer-content article { padding: .75rem; background: rgba(255,255,255,.035); border: 1px solid rgba(255,255,255,.08); border-radius: 6px; }
#atlas-explainer-content h2 { margin: 0 0 .25rem; color: var(--accent); font-size: .9rem; }
#atlas-explainer-content p { color: var(--text-muted); font-size: .75rem; }
.atlas-catalogue { min-width: 0; padding-bottom: 3rem; }
.atlas-heading-row { display: flex; justify-content: space-between; align-items: end; gap: 1rem; margin-bottom: .7rem; }
.atlas-heading-row h2 { margin: .1rem 0 0; font-size: 1.5rem; }
.atlas-heading-row > p { color: var(--text-muted); font: .72rem ui-monospace, monospace; }
.overline { color: var(--accent); font-size: .66rem; font-weight: 800; letter-spacing: .11em; text-transform: uppercase; }
.atlas-controls { display: grid; grid-template-columns: minmax(210px, 1.5fr) repeat(6, minmax(125px, 1fr)) auto; gap: .55rem; padding: .8rem; background: rgba(26,31,53,.72); border: 1px solid var(--border); border-radius: 8px; }
.atlas-field { display: grid; gap: .28rem; min-width: 0; color: var(--text-muted); font-size: .61rem; font-weight: 800; letter-spacing: .07em; text-transform: uppercase; }
.atlas-field input, .atlas-field select { width: 100%; min-width: 0; height: 39px; padding: 0 .62rem; color: var(--text); background: #0a0f1b; border: 1px solid #30384d; border-radius: 5px; font: .75rem system-ui, sans-serif; }
.atlas-field select optgroup { color: #7f8da5; font-weight: 800; }
.atlas-field select option { color: var(--text); font-weight: 500; }
#atlas-reset { align-self: end; height: 39px; padding: 0 .75rem; color: var(--accent); background: transparent; border: 1px solid #39445d; border-radius: 5px; font-weight: 750; cursor: pointer; }
.atlas-active-filters { min-height: 2.2rem; display: flex; flex-wrap: wrap; align-items: center; gap: .4rem; padding: .5rem 0; }
.atlas-active-filters button { padding: .3rem .55rem; color: #cfe6ff; background: rgba(74,158,255,.1); border: 1px solid rgba(74,158,255,.35); border-radius: 999px; font-size: .68rem; cursor: pointer; }
.atlas-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .8rem; }
.atlas-card { min-width: 0; overflow: hidden; color: var(--text); background: #080d17; border: 1px solid var(--border); border-radius: 8px; cursor: pointer; transition: transform .18s ease, border-color .18s ease; }
.atlas-card:hover, .atlas-card:focus-visible { transform: translateY(-3px); border-color: rgba(74,158,255,.75); outline: none; }
.atlas-card-image { position: relative; aspect-ratio: 16 / 10; overflow: hidden; background: radial-gradient(circle, #17233a, #050810); }
.atlas-card-image img { width: 100%; height: 100%; display: block; object-fit: cover; transition: transform .35s ease; }
.atlas-card:hover img { transform: scale(1.035); }
.atlas-card-image::after { content: ''; position: absolute; inset: auto 0 0; height: 40%; background: linear-gradient(transparent, rgba(5,8,16,.8)); pointer-events: none; }
.atlas-card-image span { position: absolute; z-index: 1; right: .55rem; bottom: .45rem; padding: .2rem .4rem; color: #d6e9ff; background: rgba(4,8,16,.78); border: 1px solid rgba(255,255,255,.15); border-radius: 4px; font-size: .58rem; }
.atlas-card-body { padding: .75rem; }
.atlas-card-kicker { display: flex; justify-content: space-between; gap: .5rem; color: #7f8da5; font-size: .61rem; font-weight: 750; text-transform: uppercase; }
.atlas-card h3 { margin: .2rem 0 .1rem; overflow: hidden; color: #edf5ff; font-size: 1.02rem; line-height: 1.2; text-overflow: ellipsis; white-space: nowrap; }
.atlas-card-designation { color: var(--accent); font-size: .7rem; }
.atlas-card-description { min-height: 2.8em; margin-top: .42rem; overflow: hidden; color: var(--text-muted); font-size: .72rem; line-height: 1.4; display: -webkit-box; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }
.atlas-card-meta { display: flex; justify-content: space-between; gap: .5rem; margin-top: .65rem; padding-top: .55rem; color: #aeb8c8; border-top: 1px solid rgba(255,255,255,.07); font-size: .65rem; }
.atlas-image-fallback { display: grid !important; place-items: center; padding: 1rem; color: #8490a6; object-fit: contain !important; }
.atlas-load-more { display: block; margin: 1.2rem auto 0; padding: .7rem 1.1rem; color: var(--accent); background: #0b1120; border: 1px solid rgba(74,158,255,.4); border-radius: 5px; cursor: pointer; }
.atlas-empty { grid-column: 1 / -1; padding: 4rem 1rem; color: var(--text-muted); text-align: center; border: 1px dashed var(--border); border-radius: 8px; }
.atlas-dialog { width: min(940px, calc(100% - 2rem)); max-height: calc(100vh - 2rem); margin: auto; padding: 0; overflow: auto; color: var(--text); background: #080d17; border: 1px solid rgba(74,158,255,.45); border-radius: 10px; }
.atlas-dialog::backdrop { background: rgba(0,3,10,.82); backdrop-filter: blur(5px); }
.atlas-dialog-close { position: absolute; z-index: 3; top: .7rem; right: .7rem; width: 36px; height: 36px; color: #fff; background: rgba(0,0,0,.58); border: 1px solid rgba(255,255,255,.28); border-radius: 50%; font-size: 1.35rem; cursor: pointer; }
.atlas-dialog-image-wrap { position: relative; min-height: 260px; max-height: 520px; background: #03050a; }
.atlas-dialog-image-wrap img { width: 100%; max-height: 520px; display: block; object-fit: contain; }
#atlas-dialog-wavelength { position: absolute; right: .8rem; bottom: .7rem; padding: .3rem .5rem; background: rgba(0,0,0,.72); border-radius: 4px; font-size: .65rem; }
.atlas-dialog-content { padding: 1.2rem 1.4rem 1.4rem; }
.atlas-dialog-content h2 { margin: .15rem 0 0; font-size: clamp(1.7rem, 4vw, 2.6rem); }
.atlas-dialog-designation { margin-bottom: .7rem; color: var(--accent); }
.atlas-dialog-content > p:not(.overline):not(.atlas-dialog-designation):not(.atlas-image-credit) { color: var(--text-muted); }
.atlas-dialog dl { display: grid; grid-template-columns: repeat(4, 1fr); gap: .5rem; margin: 1rem 0; }
.atlas-dialog dl div { padding: .6rem; background: rgba(255,255,255,.035); border: 1px solid rgba(255,255,255,.08); border-radius: 5px; }
.atlas-dialog dt { color: #7f8da5; font-size: .58rem; font-weight: 800; letter-spacing: .07em; text-transform: uppercase; }
.atlas-dialog dd { margin: .18rem 0 0; font-size: .76rem; font-weight: 700; }
.atlas-image-credit { color: #8290a8; font-size: .66rem; }
.atlas-dialog-actions { display: flex; flex-wrap: wrap; gap: .55rem; margin-top: .8rem; }
.atlas-dialog-actions a { padding: .55rem .7rem; color: var(--accent); border: 1px solid rgba(74,158,255,.35); border-radius: 5px; text-decoration: none; font-size: .72rem; }
@media (min-width: 1751px) {
  .deep-sky-page { display: grid; grid-template-columns: 280px minmax(0, 1fr); align-items: start; }
  .deep-sky-page > .side-menu { grid-column: 1; grid-row: 1 / span 2; }
  .deep-sky-page > .deep-sky-container { grid-column: 2; grid-row: 1; }
  .deep-sky-page > .site-footer-generated { grid-column: 2; grid-row: 2; }
}
@media (max-width: 1750px) and (min-width: 1024px) {
  .deep-sky-page { display: block; }
  .deep-sky-page > .navbar { display: flex; }
  .deep-sky-page .menu-toggle { display: block !important; }
  .deep-sky-page > .side-menu { position: fixed; width: 300px; height: 100vh; min-height: 0; padding: 3.5rem 1.5rem 1.5rem; transform: translateX(-100%); }
  .deep-sky-page > .side-menu.active { transform: translateX(0); }
  .deep-sky-page .menu-close { display: block; }
}
@media (max-width: 1280px) { .atlas-controls { grid-template-columns: repeat(4, 1fr); } .atlas-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 900px) { #atlas-explainer-content { grid-template-columns: 1fr 1fr; } .atlas-controls { grid-template-columns: 1fr 1fr; } .atlas-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } .atlas-dialog dl { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .deep-sky-container { padding-inline: .75rem; } .deep-sky-hero { padding-top: .8rem; } .atlas-heading-row { align-items: start; } .atlas-controls { grid-template-columns: 1fr; } .atlas-grid { grid-template-columns: 1fr; } #atlas-explainer-content { grid-template-columns: 1fr; } .atlas-card-description { min-height: auto; } .atlas-explainer-bar { grid-template-columns: 1fr; } .atlas-explainer-bar > a { margin: 0 .75rem .75rem; text-align: center; } }
@media (min-width: 2200px) { .deep-sky-container { max-width: calc(100vw - 304px); } .atlas-grid { grid-template-columns: repeat(8, minmax(0, 1fr)); } }
@media (prefers-reduced-motion: reduce) { .atlas-card, .atlas-card img { transition: none; } }