:root {
  --bg: #0b0e14;
  --panel: #141821;
  --fg: #d6d9df;
  --muted: #8a909a;
  --accent: #ff9a3c;
  --border: #272c36;
  --row: #1a1f2a;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--fg); font: 14px/1.4 system-ui, -apple-system, Segoe UI, sans-serif; height: 100%; }

#app {
  display: grid;
  grid-template-areas: "header header" "view panel" "desc desc";
  grid-template-columns: 1fr 340px;
  grid-template-rows: auto 1fr auto;
  height: 100vh;
}

header { grid-area: header; padding: 8px 16px; border-bottom: 1px solid var(--border); display: flex; align-items: baseline; gap: 16px; }
header h1 { font-size: 16px; margin: 0; }
header .sub { color: var(--muted); font-size: 12px; margin: 0; }
header .info-box { position: relative; margin-left: auto; }
header .info-btn {
  background: var(--row); color: var(--fg);
  border: 1px solid var(--border); border-radius: 4px;
  padding: 4px 10px; font: inherit; cursor: pointer; font-size: 12px;
}
header .info-btn:hover { border-color: var(--accent); color: var(--accent); }
header .info-popup {
  position: absolute; top: calc(100% + 6px); right: 0;
  width: 420px; max-width: 90vw;
  background: var(--panel); color: var(--fg);
  border: 1px solid var(--border); border-radius: 6px;
  padding: 10px 12px; font-size: 13px; line-height: 1.4;
  font-style: italic; color: var(--muted);
  box-shadow: 0 4px 12px rgba(0,0,0,0.5);
  z-index: 50;
}
header .info-popup p { margin: 0 0 8px; }
header .info-popup p:last-child { margin-bottom: 0; }

#view { grid-area: view; position: relative; background: #000; }
#feCanvas { display: block; width: 100%; height: 100%; }
#hud {
  position: absolute; top: 8px; left: 8px;
  pointer-events: none;
  font: 12px/1.4 ui-monospace, Menlo, monospace;
  color: #f4f6fa;
  background: rgba(10, 14, 22, 0.78);
  border: 1px solid rgba(120, 150, 200, 0.35);
  border-radius: 6px;
  padding: 6px 9px;
  max-width: 440px;
}
#hud .line { white-space: pre; }
#hud .moon-phase-box { display: flex; align-items: center; gap: 8px; margin-top: 4px; }
#hud .moon-phase-canvas { display: block; }
#hud .moon-phase-label { font-size: 11px; color: #f4f6fa; }

/* S009 / S009a — Tracker HUD panel. Offset 240px clears the main HUD
   (5 lines + moon-phase widget). Per-target blocks; each block has
   azel + two source lines (Geo / Helio). The source line matching
   BodySource takes .active (orange border); the other is .inactive
   (grey). max-height + overflow-y lets long tracked sets scroll. */
#tracker-hud {
  position: absolute; top: 240px; left: 8px;
  pointer-events: none;
  font: 12px/1.4 ui-monospace, Menlo, monospace;
  color: #f4f6fa;
  background: rgba(10, 14, 22, 0.78);
  border: 1px solid rgba(244, 166, 64, 0.45);
  border-radius: 6px;
  padding: 6px 9px;
  max-width: 460px;
  max-height: calc(100vh - 260px);
  overflow-y: auto;
}
#tracker-hud .line { white-space: pre; }
#tracker-hud .tracker-title { color: #f4a640; font-weight: 600; margin-bottom: 2px; }
#tracker-hud .tracker-foot { color: #9aa3b3; font-size: 11px; margin-top: 1px; }
#tracker-hud .tracker-block { padding: 4px 0; border-top: 1px dashed rgba(120, 150, 200, 0.20); }
#tracker-hud .tracker-block:first-child { border-top: 0; padding-top: 0; }
/* S009d — both ephemeris rows styled equally. The dual-pipeline
   readout is the point; highlighting one "active" source obscured
   the fact that both tick in sync. */
#tracker-hud .source-line {
  padding: 1px 4px; margin: 1px 0;
  color: #f4a640;
  border: 1px solid rgba(244, 166, 64, 0.65); border-radius: 3px;
  background: rgba(244, 166, 64, 0.08);
}

/* S009a — Tracker tab multi-select button grid. Each button toggles
   its id in TrackerTargets; active buttons take the orange-accent
   look. Flex-wraps to whatever rows the panel width allows. */
.row.button-grid-row {
  display: grid;
  grid-template-columns: 96px 1fr;
  align-items: start;
  column-gap: 8px;
  padding: 4px 0;
}
.row.button-grid-row > label { padding-top: 4px; color: var(--muted); }
.button-grid { display: flex; flex-wrap: wrap; gap: 3px; }
.tracker-btn {
  font: 11px/1.2 ui-monospace, Menlo, monospace;
  padding: 3px 6px;
  border: 1px solid rgba(120, 150, 200, 0.35);
  border-radius: 3px;
  background: rgba(30, 36, 48, 0.7);
  color: #d6deed;
  cursor: pointer;
  white-space: nowrap;
}
.tracker-btn:hover { background: rgba(50, 58, 74, 0.9); }
.tracker-btn.on {
  background: rgba(244, 166, 64, 0.18);
  border-color: rgba(244, 166, 64, 0.8);
  color: #f4a640;
}

#panel { grid-area: panel; background: var(--panel); border-left: 1px solid var(--border); display: flex; flex-direction: column; overflow: hidden; }
#panel .tabs { display: flex; border-bottom: 1px solid var(--border); flex-wrap: wrap; }
#panel .tabs button { flex: 1 1 auto; padding: 8px; background: transparent; border: 0; border-right: 1px solid var(--border); color: var(--muted); cursor: pointer; font: inherit; }
#panel .tabs button[aria-selected="true"] { color: var(--accent); background: var(--row); }
#panel .tab-body { overflow: auto; padding: 8px; }

.row {
  display: grid;
  grid-template-columns: 96px 78px 18px 1fr;
  gap: 6px;
  align-items: center;
  padding: 3px 0;
}
.row label { color: var(--muted); font-size: 12px; text-align: right; }
.row .unit { color: var(--muted); font-size: 11px; }
.row input.slider { width: 100%; accent-color: var(--accent); }
.row input[type="text"], .row input.num {
  width: 100%;
  background: var(--row);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 3px 5px;
  font: inherit;
  text-align: right;
  -moz-appearance: textfield;
}
.row input.num::-webkit-outer-spin-button,
.row input.num::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.row input.num:focus { border-color: var(--accent); outline: none; }
.row.bool { grid-template-columns: 96px 1fr; }
.row.bool input { justify-self: start; }
.row.bool select.sel {
  background: var(--row); color: var(--fg); border: 1px solid var(--border);
  border-radius: 3px; padding: 3px 5px; font: inherit;
}
.row.bool select.sel:focus { border-color: var(--accent); outline: none; }
.row.datetime { grid-template-columns: 96px 1fr 1fr; }
.row.datetime input[type="date"],
.row.datetime input[type="time"] {
  background: var(--row); color: var(--fg); border: 1px solid var(--border);
  border-radius: 3px; padding: 3px 5px; font: inherit; color-scheme: dark;
}
.row.datetime input:focus { border-color: var(--accent); outline: none; }
.group-title { margin: 12px 0 4px; font-weight: bold; font-size: 12px; color: var(--accent); border-bottom: 1px solid var(--border); padding-bottom: 2px; }

footer#desc {
  grid-area: desc;
  padding: 6px 16px;
  min-height: 32px;
  color: var(--fg);
  background: var(--panel);
  border-top: 1px solid var(--border);
  font-size: 13px;
}
footer#desc p { margin: 0; line-height: 1.35; }
footer#desc .desc-dynamic { color: var(--fg); }

.row.cardinal-buttons { grid-template-columns: 96px repeat(4, 1fr); gap: 4px; }
.row.cardinal-buttons button {
  background: var(--row); color: var(--fg);
  border: 1px solid var(--border); border-radius: 3px;
  padding: 3px 0; font: inherit; cursor: pointer;
}
.row.cardinal-buttons button:hover { border-color: var(--accent); color: var(--accent); }
.row.cardinal-buttons button.active {
  background: #ff8c1a; color: #1a1a1a;
  border-color: #ff8c1a; font-weight: bold;
}
.row.cardinal-buttons button.active:hover { background: #ffa040; border-color: #ffa040; color: #1a1a1a; }

.row.nudge-buttons { gap: 3px; }
.row.nudge-buttons button {
  background: var(--row); color: var(--fg);
  border: 1px solid var(--border); border-radius: 3px;
  padding: 3px 0; font: inherit; font-size: 11px;
  cursor: pointer;
}
.row.nudge-buttons button:hover { border-color: var(--accent); color: var(--accent); }

.row.action-row { grid-template-columns: 1fr; }
.row.action-row label { display: none; }
.row.action-row .action-btn {
  background: var(--row); color: var(--fg);
  border: 1px solid var(--border); border-radius: 3px;
  padding: 5px 10px; font: inherit; cursor: pointer; width: 100%;
}
.row.action-row .action-btn:hover { border-color: var(--accent); color: var(--accent); }
.row.action-row .action-btn.active {
  background: #ff8c1a; color: #1a1a1a; border-color: #ff8c1a; font-weight: bold;
}
.row.action-row .action-btn.active:hover { background: #ffa040; border-color: #ffa040; color: #1a1a1a; }

.autoplay-row {
  display: flex; align-items: center; gap: 8px; margin: 6px 0;
}
.autoplay-btn {
  flex: 0 0 auto;
  padding: 6px 14px;
  background: var(--row); color: var(--fg);
  border: 1px solid var(--border); border-radius: 4px;
  cursor: pointer; font: inherit;
}
.autoplay-btn:hover { border-color: var(--accent); color: var(--accent); }
.autoplay-status { color: var(--muted); font-size: 11px; }
.autoplay-presets { display: flex; gap: 4px; margin-bottom: 4px; }
.autoplay-presets button {
  flex: 1 1 0; padding: 4px 6px;
  background: var(--row); color: var(--fg);
  border: 1px solid var(--border); border-radius: 3px;
  cursor: pointer; font: inherit; font-size: 12px;
}
.autoplay-presets button:hover { border-color: var(--accent); color: var(--accent); }
.autoplay-presets button[aria-current="true"] { color: var(--accent); border-color: var(--accent); background: rgba(255, 154, 60, 0.1); }

.demo-controls { display: flex; gap: 4px; margin-top: 8px; }
.demo-controls button { flex: 1; padding: 6px 8px; background: var(--row); color: var(--fg); border: 1px solid var(--border); cursor: pointer; font: inherit; }
.demo-controls button:hover { border-color: var(--accent); color: var(--accent); }
.demo-list { display: flex; flex-direction: column; gap: 2px; margin-top: 6px; max-height: 240px; overflow: auto; }
.demo-list button { text-align: left; padding: 4px 6px; background: var(--row); color: var(--fg); border: 1px solid var(--border); cursor: pointer; font: inherit; }
.demo-list button[aria-current="true"] { color: var(--accent); border-color: var(--accent); }

/* S200 — Meeus warning banner. Pinned to the bottom of the #view
   pane. Red text on a translucent dark background, pointer-events
   disabled so it doesn't interfere with the canvas. */
#meeus-warning {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none;
  text-align: center;
  padding: 6px 10px;
  font: 12px/1.3 ui-monospace, Menlo, monospace;
  color: #ff5e5e;
  background: rgba(20, 0, 0, 0.65);
  border-top: 1px solid rgba(255, 60, 60, 0.5);
  z-index: 12;
  letter-spacing: 0.02em;
}
#meeus-warning strong { color: #ff8a8a; }

/* S200 — eclipse-demo group headers + "play all" buttons. The
   demo-list height grows because there are 100+ eclipse entries;
   max-height pushed up so the section is scrollable independently. */
.demo-list { max-height: 380px; }
.demo-group-header {
  margin-top: 8px;
  padding: 4px 6px;
  background: rgba(255, 154, 60, 0.10);
  color: var(--accent);
  font-weight: 600;
  font-size: 12px;
  border-radius: 3px;
  user-select: none;
}
.demo-group-header:first-child { margin-top: 0; }
.demo-play-all {
  text-align: left;
  padding: 3px 8px;
  margin-bottom: 2px;
  background: rgba(255, 154, 60, 0.06);
  color: var(--accent);
  border: 1px dashed rgba(255, 154, 60, 0.5);
  cursor: pointer;
  font: inherit;
  font-size: 11px;
}
.demo-play-all:hover { background: rgba(255, 154, 60, 0.15); }