/* ═══════════════════════════════════════════════════════════════════════
   ObsPlan — shared visual language with astrodeepsearch / kosmocal /
   scical / coordswap.
   ═══════════════════════════════════════════════════════════════════════ */

:root {
  --bg:           #0b0d12;
  --surface:      #13161f;
  --surface-2:    #1a1e29;
  --hairline:     #1d2129;
  --border:       #2a2f3a;
  --border-2:     #3a4050;
  --ink:          #e5e5e5;
  --ink-soft:     #b8b8b8;
  --ink-mute:     #7d8593;
  --gold:         #e0a449;
  --gold-bg:      rgba(224, 164, 73, 0.10);
  --teal:         #4ec9b0;
  --teal-bg:      rgba(78, 201, 176, 0.10);
  --rose:         #d97777;
  --rose-bg:      rgba(217, 119, 119, 0.10);
  --lavender:     #b89ff0;

  --font-body:    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif:   "Times New Roman", Georgia, serif;
  --font-mono:    "JetBrains Mono", "Courier New", "DejaVu Sans Mono", monospace;

  --content-w:    1100px;
  --gutter:       28px;
  --radius:       4px;
  --ease:         cubic-bezier(0.4, 0.0, 0.2, 1);
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
}
body {
  min-height: 100vh;
  background:
    radial-gradient(ellipse 1200px 600px at 50% -100px, rgba(224,164,73,0.06), transparent 60%),
    var(--bg);
}
a { color: var(--gold); text-decoration: none; }
a:hover { text-decoration: underline; }
em { font-style: italic; color: var(--gold); font-family: var(--font-serif); }
code { font-family: var(--font-mono); font-size: 0.92em; color: var(--gold); background: var(--gold-bg); padding: 1px 6px; border-radius: 3px; }
strong { color: var(--ink); font-weight: 600; }
.mono { font-family: var(--font-mono); }
.muted { color: var(--ink-mute); }
.small { font-size: 12.5px; }
.num { font-variant-numeric: tabular-nums; }

/* ──────────── Masthead + hero (shared) ──────────── */
.masthead {
  max-width: var(--content-w);
  margin: 0 auto;
  padding: 22px var(--gutter);
  display: flex; justify-content: space-between; align-items: center;
  border-bottom: 0.5px solid var(--hairline);
  flex-wrap: wrap; gap: 10px;
}
.masthead__brand {
  display: flex; align-items: baseline;
  font-family: var(--font-serif); font-size: 22px; font-style: italic;
}
.masthead__brand-mark { color: var(--gold); font-weight: 600; }
.masthead__brand-name { color: var(--ink); }
.masthead__nav { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.link {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 6px 14px;
  border-radius: 4px;
  color: var(--ink-soft);
  font-size: 13px;
  transition: all 120ms var(--ease);
}
.link:hover { color: var(--ink); background: var(--surface-2); border-color: var(--gold); text-decoration: none; }

.hero {
  max-width: var(--content-w);
  margin: 0 auto;
  padding: clamp(46px, 7vh, 80px) var(--gutter) 24px;
  text-align: center;
}
.kicker {
  font-family: var(--font-mono);
  font-size: 11px; text-transform: uppercase;
  letter-spacing: 0.22em; color: var(--gold);
  margin: 0 0 14px;
}
.kicker--small { font-size: 10px; letter-spacing: 0.18em; margin-bottom: 8px; }
.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(28px, 4.2vw, 46px);
  font-weight: 400; line-height: 1.18;
  margin: 0 0 18px;
}
.hero__lede { max-width: 720px; margin: 0 auto; color: var(--ink-soft); font-size: 15.5px; }

/* ──────────── Mode tabs ──────────── */
.mode-tabs-wrap {
  max-width: var(--content-w);
  margin: 28px auto 22px;
  padding: 0 var(--gutter);
  display: flex; justify-content: center;
}
.mode-tabs {
  display: inline-flex;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 4px; gap: 2px;
}
.mode-tab {
  background: transparent; border: 0; color: var(--ink-mute);
  padding: 9px 24px;
  font-family: var(--font-mono); font-size: 12.5px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.1em;
  border-radius: 100px; cursor: pointer;
  transition: all 150ms var(--ease);
}
.mode-tab:hover { color: var(--ink); }
.mode-tab--active {
  background: var(--gold); color: #1a1208;
  box-shadow: 0 1px 0 rgba(255,255,255,0.18) inset, 0 6px 14px -8px rgba(224,164,73,0.6);
}

.layout { max-width: var(--content-w); margin: 0 auto; padding: 0 var(--gutter); }
.mode-panel { animation: fadein 200ms var(--ease); }
@keyframes fadein { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

/* ──────────── Single input panel ──────────── */
.single-input {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--gold);
  border-radius: var(--radius);
  padding: 22px 24px 20px;
  margin-bottom: 28px;
}
.single-input__row { display: flex; gap: 14px; align-items: flex-end; flex-wrap: wrap; margin-bottom: 14px; }
.single-input__row:last-child { margin-bottom: 0; }
.single-input__row--config { gap: 12px; }
.single-input__field { display: flex; flex-direction: column; flex: 1; min-width: 200px; gap: 6px; }
.single-input__field--wide   { flex: 1; min-width: 100%; }
.single-input__field--small  { flex: 0 0 auto; min-width: 180px; }
.single-input__field--medium { flex: 1 1 320px; min-width: 320px; }
.single-input__label {
  font-family: var(--font-mono);
  font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.14em;
  color: var(--ink-mute);
}
.single-input input[type="text"],
.single-input input[type="number"],
.single-input input[type="date"] {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 14px;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 15px;
  transition: border-color 120ms var(--ease), box-shadow 120ms var(--ease);
  width: 100%;
  color-scheme: dark;
}
.single-input input:focus, .single-input select:focus {
  outline: none; border-color: var(--gold);
  box-shadow: 0 0 0 2px rgba(224,164,73,0.22);
}

/* ──────────── Custom location panel ──────────── */
.custom-loc {
  width: 100%;
  margin-top: 4px;
  padding: 14px 16px;
  background: var(--bg);
  border: 1px dashed var(--border-2);
  border-radius: var(--radius);
}
.custom-loc__grid {
  display: grid; gap: 10px;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
}
.custom-loc label { display: flex; flex-direction: column; gap: 4px; }
.custom-loc__label {
  font-family: var(--font-mono);
  font-size: 10px; text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--ink-mute);
}
.custom-loc input {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 7px 9px;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  color-scheme: dark;
}
.custom-loc input:focus { outline: none; border-color: var(--gold); }

/* ──────────── Result head + meta ──────────── */
.single-output { animation: fadein 200ms var(--ease); }
.result-head {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 26px;
  padding: 18px 22px 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--teal);
  border-radius: var(--radius);
  margin-bottom: 20px;
}
.result-name {
  margin: 4px 0 6px;
  font-family: var(--font-serif); font-style: italic;
  font-size: 26px; font-weight: 400; color: var(--ink);
}
.result-obs {
  margin: 4px 0 6px;
  font-family: var(--font-serif); font-style: italic;
  font-size: 22px; font-weight: 400; color: var(--ink);
}
.result-coords { color: var(--ink-soft); font-size: 13px; margin: 0 0 10px; }
.result-meta .kicker { color: var(--teal); }

/* ──────────── Visibility plot wrap ──────────── */
.plot-wrap {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  margin-bottom: 20px;
  overflow-x: auto;
  position: relative;
}
.plot-svg { display: block; width: 100%; height: auto; max-width: 100%; cursor: crosshair; }
.plot-svg .plot-hover { pointer-events: none; }

/* ──────────── Hover readout strip below plot ──────────── */
.plot-readout {
  margin-top: 8px;
  padding: 8px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-left: 3px solid var(--gold);
  border-radius: 3px;
  font-size: 12px;
  color: var(--ink-soft);
  display: flex;
  flex-wrap: wrap;
  gap: 6px 0;
  align-items: center;
}
.plot-readout strong { color: var(--gold); font-weight: 600; }
.plot-readout__sep { color: var(--ink-mute); margin: 0 4px; opacity: 0.5; }
.plot-readout__time { color: var(--ink); }

/* ──────────── Multi-night bar chart ──────────── */
.multi-night__bar { cursor: pointer; transition: opacity 100ms var(--ease); }
.multi-night__bar:hover { opacity: 1 !important; filter: brightness(1.2); }
.multi-night__readout {
  margin-top: 8px;
  padding: 8px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-left: 3px solid var(--gold);
  border-radius: 3px;
  font-size: 12.5px;
  color: var(--ink-soft);
}
.multi-night__readout strong { color: var(--gold); }
.multi-night__legend {
  display: flex;
  gap: 22px;
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-mute);
  flex-wrap: wrap;
}
.multi-night__legend-item { display: inline-flex; align-items: center; gap: 6px; }
.swatch {
  display: inline-block; width: 12px; height: 12px; border-radius: 2px;
}
.swatch--gold { background: var(--gold); }
.swatch--teal { background: var(--teal); opacity: 0.55; }
.swatch--dim  { background: var(--border-2); opacity: 0.5; }
tr.multi-top td { background: rgba(224, 164, 73, 0.05); }
.multi-jump {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--teal);
}

/* ──────────── Stats grid ──────────── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 22px;
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px;
}
.stat-card:nth-child(1) { border-left: 3px solid var(--gold); }
.stat-card:nth-child(2) { border-left: 3px solid var(--teal); }
.stat-card:nth-child(3) { border-left: 3px solid var(--lavender); }
.stat-card .kicker { margin-bottom: 6px; }
.stat-card:nth-child(2) .kicker { color: var(--teal); }
.stat-card:nth-child(3) .kicker { color: var(--lavender); }
.stat-card p { margin: 0; }
.stat-value {
  font-family: var(--font-mono);
  font-size: 17px;
  color: var(--ink);
  margin: 4px 0 6px !important;
}

/* ──────────── Twilight table ──────────── */
.twilight-table-wrap { margin-bottom: 22px; }
.twilight-table-wrap .kicker { margin-bottom: 10px; }
.twilight-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.twilight-table td {
  padding: 10px 14px;
  border-bottom: 0.5px solid var(--hairline);
  font-size: 13.5px;
}
.twilight-table td:nth-child(odd) { color: var(--ink-soft); }
.twilight-table td:nth-child(even) { color: var(--ink); }
.twilight-table tr:last-child td { border-bottom: 0; }
.twilight-table td:nth-child(2), .twilight-table td:nth-child(4) { width: 90px; text-align: right; }

/* ──────────── Cross-link buttons ──────────── */
.result-cross-link {
  display: flex; gap: 12px; flex-wrap: wrap;
  margin-bottom: 12px;
}
.ads-link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--teal);
  padding: 8px 14px;
  background: var(--teal-bg);
  border: 1px solid var(--teal);
  border-radius: var(--radius);
  cursor: pointer;
}
button.ads-link {
  font-weight: normal;
}
.ads-link:hover { background: var(--teal); color: #062420; text-decoration: none; }

.error-state {
  background: var(--rose-bg);
  border: 1px solid var(--rose);
  border-left-width: 4px;
  border-radius: var(--radius);
  padding: 14px 18px;
  color: var(--rose);
}
.error-state strong { color: var(--rose); }

/* ──────────── BATCH MODE ──────────── */
.batch-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
  margin-bottom: 16px;
}
.batch-section:nth-child(1) { border-left: 4px solid var(--gold); }
.batch-section:nth-child(2) { border-left: 4px solid var(--teal); }
.batch-section:nth-child(3) { border-left: 4px solid var(--lavender); }
.batch-section:nth-child(4) { border-left: 4px solid var(--gold); }
.batch-section h2 {
  margin: 0 0 12px;
  font-family: var(--font-serif); font-style: italic;
  font-size: 22px; font-weight: 400;
  color: var(--ink);
  display: flex; align-items: center; gap: 14px;
}
.batch-step {
  display: inline-flex; align-items: center; justify-content: center;
  width: 30px; height: 30px;
  background: var(--gold); color: #1a1208;
  border-radius: 50%;
  font-family: var(--font-mono); font-size: 13px; font-weight: 700; font-style: normal;
  flex-shrink: 0;
}
.batch-section:nth-child(2) .batch-step { background: var(--teal);     color: #062420; }
.batch-section:nth-child(3) .batch-step { background: var(--lavender); color: #1c1430; }
.batch-section:nth-child(4) .batch-step { background: var(--gold);     color: #1a1208; }

.batch-input-actions { display: flex; gap: 10px; margin: 12px 0; flex-wrap: wrap; }
.batch-section textarea {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 14px; line-height: 1.55;
  resize: vertical; min-height: 170px;
  transition: border-color 120ms var(--ease);
}
.batch-section textarea:focus { outline: none; border-color: var(--gold); box-shadow: 0 0 0 2px rgba(224,164,73,0.18); }

.batch-config-row { display: flex; gap: 16px; align-items: end; flex-wrap: wrap; margin-bottom: 12px; }
.batch-config__col { display: flex; flex-direction: column; gap: 6px; flex: 1; min-width: 180px; }
.batch-config__col--wide { flex: 2 1 320px; min-width: 320px; }
.batch-config__col input[type="date"] {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 12px;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 14px;
  color-scheme: dark;
}
.batch-config__col input:focus { outline: none; border-color: var(--gold); }

.batch-downloads { display: flex; gap: 10px; margin: 12px 0; flex-wrap: wrap; }

/* ──────────── Selects (chevron arrow) ──────────── */
.select-styled, select {
  appearance: none; -webkit-appearance: none;
  background-color: var(--bg);
  background-image:
    linear-gradient(45deg, transparent 50%, var(--gold) 50%),
    linear-gradient(135deg, var(--gold) 50%, transparent 50%);
  background-position: calc(100% - 14px) 50%, calc(100% - 9px) 50%;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  color: var(--ink);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 32px 10px 12px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  cursor: pointer;
  transition: border-color 120ms var(--ease);
  color-scheme: dark;
}
select:hover { border-color: var(--gold); }
select:focus { outline: none; border-color: var(--teal); box-shadow: 0 0 0 2px rgba(78,201,176,0.22); }
optgroup { font-family: var(--font-serif); font-style: italic; color: var(--gold); }

/* ──────────── Buttons ──────────── */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 14px; font-weight: 600;
  cursor: pointer;
  transition: all 120ms var(--ease);
  padding: 10px 18px;
}
.btn--primary { background: var(--gold); color: #1a1208; border-color: var(--gold); font-size: 15px; }
.btn--primary:hover { background: #f0b25a; }
.btn--secondary { background: var(--surface-2); color: var(--ink); border-color: var(--border); }
.btn--secondary:hover { border-color: var(--gold); color: var(--gold); }
.btn--danger { background: var(--surface-2); color: var(--ink-mute); border-color: var(--border); font-size: 13px; padding: 7px 14px; }
.btn--danger:hover { color: var(--rose); border-color: var(--rose); }
.btn code { background: transparent; padding: 0; color: inherit; font-size: inherit; }

/* ──────────── Batch results table ──────────── */
.results-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 14px;
}
.results-table thead { background: var(--surface-2); }
.results-table th {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.14em;
  color: var(--ink-mute); font-weight: 700;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}
.results-table td {
  padding: 11px 14px;
  border-bottom: 0.5px solid var(--hairline);
  vertical-align: middle;
  font-size: 13.5px;
}
.results-table tr:last-child td { border-bottom: 0; }
.results-table tr:hover td { background: rgba(224, 164, 73, 0.03); }
.results-table__num { width: 50px; }
.results-table__err td { background: var(--rose-bg) !important; color: var(--rose); }

/* ──────────── About + footer ──────────── */
.about { max-width: var(--content-w); margin: 56px auto; padding: 0 var(--gutter); }
.section-head { margin-bottom: 16px; }
.about__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 36px; }
.about h3 {
  font-family: var(--font-mono);
  font-size: 11.5px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.16em;
  color: var(--gold);
  margin: 22px 0 10px;
}
.about h3:first-child { margin-top: 0; }
.about p { color: var(--ink-soft); font-size: 14.5px; line-height: 1.7; }
.footer {
  max-width: var(--content-w);
  margin: 80px auto 30px;
  padding: 24px var(--gutter);
  border-top: 0.5px solid var(--hairline);
  text-align: center;
}

/* ──────────── Responsive ──────────── */
@media (max-width: 920px) {
  .stats-grid { grid-template-columns: 1fr; }
  .result-head { grid-template-columns: 1fr; gap: 14px; }
  .custom-loc__grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  .about__grid { grid-template-columns: 1fr; gap: 0; }
  .twilight-table td { padding: 8px 10px; font-size: 12px; }
  .twilight-table td:nth-child(2), .twilight-table td:nth-child(4) { width: auto; }
  .results-table th, .results-table td { padding: 8px 6px; font-size: 11.5px; }
  .mode-tab { padding: 8px 14px; font-size: 11px; }
  .hero__title { font-size: 26px; }
  .custom-loc__grid { grid-template-columns: 1fr; }
}