:root {
  --ss-primary: #321fdb;
  --ss-primary-rgb: 50, 31, 219;
  --ss-sidebar: #27344d;
  --ss-sidebar-deep: #1e293b;
  --ss-canvas: #f3f4f7;
  --ss-card: #ffffff;
  --ss-text: #222b45;
  --ss-muted: #768192;
  --ss-border: #d8dbe0;
  --ss-shadow: 0 0.125rem 0.375rem rgba(60, 75, 100, 0.12);
}

[data-theme="observatory"] {
  --ss-primary: #0b7285;
  --ss-primary-rgb: 11, 114, 133;
  --ss-sidebar: #12343b;
  --ss-sidebar-deep: #0b2429;
  --ss-canvas: #f4f8f7;
}

[data-theme="ember"] {
  --ss-primary: #c2410c;
  --ss-primary-rgb: 194, 65, 12;
  --ss-sidebar: #3c2a24;
  --ss-sidebar-deep: #271915;
  --ss-canvas: #fbf6f3;
}

[data-theme="midnight"] {
  --ss-primary: #5f6fff;
  --ss-primary-rgb: 95, 111, 255;
  --ss-sidebar: #151b2b;
  --ss-sidebar-deep: #090d17;
  --ss-canvas: #111827;
  --ss-card: #1f2937;
  --ss-text: #eef2ff;
  --ss-muted: #b4bfd3;
  --ss-border: #3d4a5e;
}

* { box-sizing: border-box; }

body {
  min-width: 320px;
  color: var(--ss-text);
  background: var(--ss-canvas);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a { color: var(--ss-primary); }

.app-shell { min-height: 100vh; }

.app-sidebar {
  min-height: 100vh;
  background: linear-gradient(180deg, var(--ss-sidebar), var(--ss-sidebar-deep));
  color: rgba(255, 255, 255, 0.84);
}

.brand {
  display: flex;
  align-items: center;
  gap: .75rem;
  min-height: 4.5rem;
  padding: 1rem 1.25rem;
  color: #fff;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  text-decoration: none;
}

.brand small { display: block; color: rgba(255, 255, 255, .62); font-size: .7rem; letter-spacing: .07em; text-transform: uppercase; }
.brand strong { display: block; font-size: .95rem; line-height: 1.15; }

.nav-caption {
  margin: 1.5rem 1.25rem .5rem;
  color: rgba(255, 255, 255, .5);
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.mode-nav { align-items: stretch; }

.mode-nav .nav-link {
  display: block;
  width: calc(100% - 1rem);
  margin: .14rem .5rem;
  padding: .65rem .8rem;
  color: rgba(255, 255, 255, .78);
  border: 0;
  border-radius: .35rem;
  text-align: left;
}

.mode-nav .nav-link:hover,
.mode-nav .nav-link.active { color: #fff; background: rgba(255, 255, 255, .14); }
.mode-nav .nav-link.active { box-shadow: inset 3px 0 0 #fff; }

.sidebar-divider {
  display: block;
  width: calc(100% - 2.5rem);
  height: 1px;
  margin: .75rem 1.25rem;
  background: rgba(255, 255, 255, .18);
}

.sidebar-note {
  margin: 1.5rem 1.25rem;
  padding: .8rem;
  color: rgba(255, 255, 255, .62);
  background: rgba(0, 0, 0, .16);
  border-radius: .35rem;
  font-size: .78rem;
}

.mobile-sidebar-actions,
.mobile-nav-toggle,
.sidebar-backdrop { display: none; }

.app-main { min-width: 0; }

.topbar {
  min-height: 4.5rem;
  background: var(--ss-card);
  border-bottom: 1px solid var(--ss-border);
  box-shadow: 0 .05rem .15rem rgba(60, 75, 100, .05);
}

.breadcrumb-trail { display: flex; gap: .55rem; color: var(--ss-muted); font-size: .78rem; }
.breadcrumb-arrow { color: var(--ss-text); font-weight: 700; }

.topbar-options { display: flex; align-items: flex-end; gap: .75rem; }
.topbar-select { display: flex; flex-direction: column; gap: .15rem; color: var(--ss-muted); font-size: .68rem; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; }
.topbar-select .form-select { min-width: 8.75rem; font-size: .78rem; letter-spacing: normal; text-transform: none; }
.input-group-text { background: var(--ss-canvas); border-color: var(--ss-border); color: var(--ss-muted); }
.form-control, .form-select { border-color: var(--ss-border); color: var(--ss-text); background-color: var(--ss-card); }
.form-control:focus, .form-select:focus { border-color: rgba(var(--ss-primary-rgb), .65); box-shadow: 0 0 0 .2rem rgba(var(--ss-primary-rgb), .16); }
.btn-primary { --bs-btn-bg: var(--ss-primary); --bs-btn-border-color: var(--ss-primary); --bs-btn-hover-bg: var(--ss-primary); --bs-btn-hover-border-color: var(--ss-primary); --bs-btn-active-bg: var(--ss-primary); --bs-btn-active-border-color: var(--ss-primary); }
.btn-outline-primary { --bs-btn-color: var(--ss-primary); --bs-btn-border-color: var(--ss-primary); --bs-btn-hover-bg: var(--ss-primary); --bs-btn-hover-border-color: var(--ss-primary); --bs-btn-active-bg: var(--ss-primary); --bs-btn-active-border-color: var(--ss-primary); }

.catalogue-combobox { position: relative; }
.catalogue-menu {
  top: calc(100% + .25rem);
  left: 0;
  z-index: 1050;
  width: 100%;
  max-height: 24rem;
  padding: .35rem;
  overflow-y: auto;
  color: var(--ss-text);
  background: var(--ss-card);
  border-color: var(--ss-border);
  box-shadow: var(--ss-shadow);
}
.catalogue-menu.show { display: block; }
.catalogue-menu .dropdown-divider { border-color: var(--ss-border); }
.catalogue-empty { margin: .45rem .6rem; color: var(--ss-muted); font-size: .8rem; }
.catalogue-current,
.catalogue-option {
  display: block;
  width: 100%;
  padding: .45rem .6rem;
  color: var(--ss-text);
  border: 0;
  border-radius: .25rem;
  background: transparent;
  text-align: left;
}
.catalogue-current { color: var(--ss-primary); font-weight: 700; }
.catalogue-current:disabled { color: var(--ss-muted); font-weight: 500; }
.catalogue-option:hover,
.catalogue-option:focus { color: #fff; background: var(--ss-primary); outline: 0; }

.main-content { max-width: 1700px; margin: 0 auto; padding: 1.5rem; }
.page-title { font-size: clamp(1.4rem, 2vw, 1.8rem); font-weight: 700; letter-spacing: -.025em; }
.page-subtitle { color: var(--ss-muted); }

.dashboard-card {
  background: var(--ss-card);
  border: 1px solid var(--ss-border);
  border-radius: .5rem;
  box-shadow: var(--ss-shadow);
}

.dashboard-card .card-header {
  padding: 1rem 1.1rem;
  background: transparent;
  border-bottom-color: var(--ss-border);
}

.dashboard-card > .card-body { padding: 1.25rem; }
#global-mode-controls,
#library-mode-controls { margin-right: 0; margin-left: 0; }

.card-title { margin: 0; color: var(--ss-text); font-size: .95rem; font-weight: 700; }
.card-kicker { margin-bottom: .25rem; color: var(--ss-muted); font-size: .7rem; font-weight: 700; letter-spacing: .07em; text-transform: uppercase; }

.stat-tile { padding: 1rem; height: 100%; border-left: 3px solid var(--ss-primary); }
.stat-tile .value { color: var(--ss-text); font-size: 1.25rem; font-weight: 700; }
.stat-tile .label { color: var(--ss-muted); font-size: .78rem; }

.selection-status { color: var(--ss-muted); font-size: .85rem; }
.selection-status strong { color: var(--ss-text); }

.download-list { display: flex; flex-wrap: wrap; gap: .45rem; }
.download-list .btn { font-size: .78rem; }

.source-name-list { display: grid; gap: .38rem; }
.source-name-row { display: flex; align-items: baseline; flex-wrap: wrap; gap: .4rem; font-size: .82rem; line-height: 1.35; }
.source-name-row .source-name { color: var(--ss-primary); font-weight: 600; }
.source-name-row .source-library { color: var(--ss-muted); }
.source-name-row .source-simbad,
.source-name-row .source-download { color: var(--ss-muted); font-size: .75rem; text-decoration: none; }
.source-name-row .source-simbad:hover,
.source-name-row .source-download:hover { color: var(--ss-primary); }
.source-name-row.is-current .source-name::after { margin-left: .35rem; color: var(--ss-muted); content: "current"; font-size: .7rem; font-weight: 500; }

.citation-section + .citation-section { margin-top: 2rem; }
.citation-section-heading { align-items: end; border-bottom: 1px solid var(--ss-border); display: flex; justify-content: space-between; margin-bottom: .65rem; padding-bottom: .65rem; }
.citation-section-heading h3 { color: var(--ss-text); }
.citation-section-heading > span { color: var(--ss-muted); font-size: .76rem; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; }
.citation-note { color: var(--ss-muted); font-size: .8rem; margin: -.1rem 0 .75rem; }
.citation-rows { border-top: 1px solid var(--ss-border); }
.citation-row { align-items: center; border-bottom: 1px solid var(--ss-border); display: grid; gap: .8rem 1.25rem; grid-template-columns: minmax(10.5rem, .8fr) minmax(0, 2.2fr) minmax(7.35rem, auto); padding: .85rem 0; }
.citation-folder { display: grid; gap: .18rem; }
.citation-folder code { color: var(--ss-primary); font-size: .78rem; font-weight: 700; }
.citation-folder span { color: var(--ss-muted); font-size: .78rem; }
.citation-row p { color: var(--ss-text); font-size: .84rem; line-height: 1.5; margin: 0; }
.citation-ads { display: grid; gap: .35rem; justify-items: stretch; }
.citation-ads a { background: var(--ss-primary-soft); border-radius: 999px; color: var(--ss-primary); font-size: .74rem; font-weight: 700; padding: .32rem .54rem; text-align: center; text-decoration: none; white-space: nowrap; }
.citation-ads a:hover { background: color-mix(in srgb, var(--ss-primary) 17%, transparent); color: var(--ss-primary); }

.coordinate-value { color: var(--ss-text); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .84rem; }
.muted-copy { color: var(--ss-muted); font-size: .82rem; }

.aladin-frame {
  overflow: hidden;
  min-height: 26.325rem;
  border: 1px solid var(--ss-border);
  border-radius: .35rem;
  background: #111;
}

#aladin-lite-div { width: 100%; height: 26.325rem; }

.plot-card { min-height: 38rem; }
.plot-toolbar { background: color-mix(in srgb, var(--ss-canvas) 72%, var(--ss-card)); border-bottom: 1px solid var(--ss-border); }
.plot-toolbar .form-select { min-width: 10.25rem; }
.plot-wrapper { position: relative; min-height: 32rem; }
#plotly-chart { width: 100%; min-height: 32rem; }

.visibility-card { margin-top: 1.5rem; }
.visibility-wrapper { min-height: 31rem; border: 1px solid var(--ss-border); border-radius: .35rem; overflow: hidden; background: #fff; }
#visibility-chart { width: 100%; min-height: 31rem; }
.visibility-key { display: flex; flex-wrap: wrap; gap: .4rem .65rem; margin-top: 1rem; }
.visibility-key-item { display: inline-flex; align-items: center; gap: .35rem; color: var(--ss-muted); font-size: .75rem; }
.visibility-key-item::before { width: .8rem; height: .8rem; content: ""; border: 1px solid rgba(0, 0, 0, .16); border-radius: .15rem; background: currentColor; }
.visibility-key-item.day::before { background: #262626; }
.visibility-key-item.civil::before { background: #616161; }
.visibility-key-item.nautical::before { background: #999; }
.visibility-key-item.astronomical::before { background: #d1d1d1; }
.visibility-key-item.night::before { background: #fff; }

.chart-state {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  text-align: center;
  background: var(--ss-card);
  z-index: 2;
}

.chart-state[hidden] { display: none; }
.chart-state-panel { max-width: 28rem; }
.chart-orbit {
  width: 4rem;
  height: 4rem;
  margin: 0 auto 1rem;
  border: 2px solid rgba(var(--ss-primary-rgb), .24);
  border-top-color: var(--ss-primary);
  border-radius: 50%;
}
.chart-state:not(.loading) .chart-orbit { animation: orbit 5s linear infinite; }
.chart-state.loading .chart-orbit { animation: orbit .85s linear infinite; }
@keyframes orbit { to { transform: rotate(360deg); } }

.axis-warning { display: none; margin: 0; border-radius: 0; font-size: .82rem; }
.axis-warning.visible { display: block; }

.library-count { color: var(--ss-muted); font-size: .78rem; }
.form-text { color: var(--ss-muted); }

.app-footer { color: var(--ss-muted); font-size: .8rem; }
.app-footer a { text-decoration: none; }
.app-footer a:hover { text-decoration: underline; }

[data-theme="midnight"] .plot-toolbar { background: #1a2434; }
[data-theme="midnight"] .btn-outline-secondary { --bs-btn-color: #d7deeb; --bs-btn-border-color: #65738a; --bs-btn-hover-bg: #48566b; --bs-btn-hover-border-color: #65738a; }
[data-theme="midnight"] .btn-light { --bs-btn-bg: #2c394c; --bs-btn-border-color: #465570; --bs-btn-color: #eef2ff; --bs-btn-hover-bg: #3a4960; }

@media (min-width: 1200px) {
  .viewer-info-column { flex: 0 0 56.667%; max-width: 56.667%; }
  .viewer-aladin-column { flex: 0 0 43.333%; max-width: 43.333%; }
}

@media (max-width: 991.98px) {
  body.sidebar-open { overflow: hidden; }
  .app-sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 1060;
    display: flex;
    flex-direction: column;
    width: min(18rem, calc(100vw - 2.75rem));
    min-height: 100dvh;
    height: 100dvh;
    visibility: hidden;
    transform: translateX(-100%);
    transition: transform .2s ease, visibility 0s linear .2s;
  }
  body.sidebar-open .app-sidebar { visibility: visible; transform: translateX(0); transition: transform .2s ease; }
  .brand { min-height: 3.75rem; }
  .mobile-sidebar-actions { display: flex; align-items: center; justify-content: space-between; padding: .7rem 1.25rem; color: rgba(255, 255, 255, .66); border-bottom: 1px solid rgba(255, 255, 255, .14); font-size: .72rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; }
  .mobile-sidebar-actions .btn { color: #fff; border-color: rgba(255, 255, 255, .35); font-size: .72rem; text-transform: none; }
  .sidebar-body { flex: 1; overflow-y: auto; padding: .65rem 0 1rem; }
  .nav-caption { margin-top: .45rem; }
  .mode-nav { flex-direction: column; padding: 0; }
  .mode-nav .nav-link { width: calc(100% - 1rem); margin: .14rem .5rem; }
  .sidebar-divider { width: calc(100% - 2.5rem); height: 1px; margin: .75rem 1.25rem; }
  .sidebar-note { display: block; margin-top: 1rem; }
  .sidebar-backdrop { position: fixed; inset: 0; z-index: 1055; width: 100%; height: 100%; padding: 0; opacity: 0; pointer-events: none; background: rgba(5, 11, 23, .56); border: 0; transition: opacity .2s ease; }
  body.sidebar-open .sidebar-backdrop { display: block; opacity: 1; pointer-events: auto; }
  .mobile-nav-toggle { display: inline-flex; align-items: center; align-self: flex-start; gap: .45rem; padding: .4rem .55rem; color: var(--ss-text); background: transparent; border: 1px solid var(--ss-border); border-radius: .35rem; font-size: .78rem; font-weight: 600; }
  .mobile-nav-toggle span:first-child { font-size: 1rem; line-height: 1; }
  #viewer-layout { display: flex; flex-direction: column; }
  .viewer-info-column,
  .viewer-aladin-column { flex: 0 0 auto; max-width: 100%; width: 100%; }
  .viewer-info-column { order: 1; }
  .viewer-aladin-column { order: 2; }
  #plot-section { order: 3; }
}

@media (max-width: 767.98px) {
  .citation-row { align-items: start; grid-template-columns: 1fr; gap: .42rem; }
  .citation-ads { justify-items: start; }
}

@media (max-width: 575.98px) {
  .main-content { padding: 1rem; }
  .topbar { padding: .75rem 1rem; }
  .breadcrumb-trail { display: none; }
  .plot-card, .plot-wrapper, #plotly-chart, .visibility-wrapper, #visibility-chart { min-height: 26rem; }
  .plot-toolbar .form-select { min-width: 0; }
  .topbar-options { width: 100%; }
  .topbar-select { flex: 1; min-width: 0; }
  .topbar-select .form-select { width: 100%; min-width: 0; }
}