:root {
  --bg: #0b1016; --panel: #141b23; --panel2: #1a232d; --line: rgba(255, 255, 255, .1);
  --text: #e8eef4; --mut: #8d9aa7; --accent: #ff8a3d;
  --p: #4cc9f0; --s: #ffe14d; --l: #ff8a3d;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--text); }
body { display: grid; grid-template-columns: minmax(0, 1fr) 400px; height: 100vh; overflow: hidden; }
button { font: inherit; color: inherit; cursor: pointer; }
h1, h2 { margin: 0; }

/* stage */
#stage { position: relative; display: flex; flex-direction: column; min-width: 0; min-height: 0;
  background: radial-gradient(ellipse at 50% 45%, #16222e 0%, #0b1016 70%); }
#canvasWrap { position: relative; flex: 1; min-height: 0; }
#earth { position: absolute; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; cursor: crosshair; }
#readout { position: absolute; top: 12px; left: 12px; z-index: 2; display: flex; gap: 8px; flex-wrap: wrap; pointer-events: none; }
.clock { padding: 6px 12px; background: rgba(20, 27, 35, .75); backdrop-filter: blur(8px); border: 1px solid var(--line); border-radius: 10px; }
.clock small { display: block; font-size: 10px; letter-spacing: .06em; text-transform: uppercase; color: var(--mut); }
.clock b { font-variant-numeric: tabular-nums; font-size: 16px; }
#tip { position: absolute; z-index: 3; max-width: 250px; padding: 10px 12px; font-size: 12px; line-height: 1.45; pointer-events: none;
  background: rgba(14, 20, 27, .94); border: 1px solid var(--line); border-radius: 10px; box-shadow: 0 8px 24px rgba(0, 0, 0, .5); }
#tip b { font-size: 13px; }
#tip .mut, .mut { color: var(--mut); }
#tip .kv { display: flex; justify-content: space-between; gap: 12px; }
#legend { display: flex; flex-wrap: wrap; gap: 4px 14px; align-items: center; padding: 8px 14px 10px; font-size: 11.5px; color: var(--mut); }
.sw { display: inline-flex; align-items: center; gap: 6px; }
.sw i { width: 11px; height: 11px; border-radius: 3px; }
.sw i.line { height: 3px; width: 16px; border-radius: 2px; }
.sep { flex: 0 0 1px; height: 14px; background: var(--line); }

/* side panel */
#side { overflow-y: auto; padding: 14px; background: var(--panel); border-left: 1px solid var(--line); display: flex; flex-direction: column; gap: 12px; }
#side header h1 { font-size: 19px; letter-spacing: .01em; }
#side header p { margin: 4px 0 0; font-size: 12.5px; line-height: 1.45; color: var(--mut); }
.card { padding: 12px; background: var(--panel2); border: 1px solid var(--line); border-radius: 12px; }
.card h2 { font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--mut); margin-bottom: 8px; }
.head { display: flex; justify-content: space-between; align-items: baseline; }
.head h2 { margin-bottom: 8px; }
.row { display: flex; gap: 8px; margin-bottom: 10px; }
.btn { padding: 9px 12px; background: #243140; border: 1px solid var(--line); border-radius: 10px; font-weight: 600; }
.btn:hover { background: #2d3c4e; }
.btn.primary { flex: 1; background: linear-gradient(180deg, #ff9a52, #e8691b); border-color: transparent; color: #1b0d03; }
.btn.primary:hover { filter: brightness(1.08); }
.link { background: none; border: 0; padding: 0; font-size: 12px; color: var(--mut); text-decoration: underline; }
.link:hover { color: var(--text); }
.field { display: block; margin-bottom: 10px; }
.field > span { display: flex; justify-content: space-between; font-size: 12px; color: var(--mut); margin-bottom: 4px; }
.field output { color: var(--text); font-variant-numeric: tabular-nums; font-weight: 600; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
input[type=range] { width: 100%; margin: 0; accent-color: var(--accent); }
.presets { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { padding: 5px 10px; font-size: 12px; background: transparent; border: 1px solid var(--line); border-radius: 999px; color: var(--text); }
.chip:hover { background: rgba(255, 255, 255, .07); }
.toggles { display: grid; grid-template-columns: 1fr 1fr; gap: 6px 10px; font-size: 13px; }
.toggles label { display: flex; align-items: center; gap: 7px; cursor: pointer; }
.toggles input { accent-color: var(--accent); margin: 0; }
.toggles i { width: 14px; height: 3px; border-radius: 2px; }
.toggles i.hollow { height: 9px; width: 9px; border: 1.5px solid var(--mut); border-radius: 50%; }
#seis, #ttc { display: block; width: 100%; background: #0f151c; border-radius: 8px; border: 1px solid var(--line); }
#ttc { height: 200px; }
#stations { list-style: none; margin: 10px 0 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
#stations li { display: grid; grid-template-columns: 14px 1fr 22px; gap: 8px; align-items: start; font-size: 12px; line-height: 1.4; }
#stations .dot { width: 12px; height: 12px; margin-top: 2px; border-radius: 50%; }
#stations .mut { color: var(--mut); }
#stations .x { width: 22px; height: 22px; padding: 0; background: none; border: 0; border-radius: 6px; color: var(--mut); font-size: 16px; line-height: 1; }
#stations .x:hover { background: rgba(255, 255, 255, .08); color: var(--text); }
.empty { color: var(--mut); font-size: 12px; margin-top: 8px; }
.note { margin: 8px 0 0; font-size: 12px; line-height: 1.45; color: var(--mut); }
details summary { cursor: pointer; font-weight: 600; font-size: 13px; }
.facts { margin: 10px 0 0; padding-left: 18px; font-size: 12.5px; line-height: 1.5; display: flex; flex-direction: column; gap: 6px; }

:focus-visible { outline: 2px solid var(--p); outline-offset: 2px; }

@media (max-width: 900px) {
  body { grid-template-columns: 1fr; height: auto; overflow: auto; }
  #stage { height: 78vh; min-height: 440px; }
  #side { overflow: visible; border-left: 0; border-top: 1px solid var(--line); }
  #readout { gap: 6px; }
  .clock { padding: 4px 8px; }
  .clock b { font-size: 14px; }
}
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; } }