/* ------------------------------------------------------------------
   Museum-grade overlay UI: dark, flat, hairline borders, thin type.
   No rounded cards, no generic purple gradients.
------------------------------------------------------------------ */
:root {
  --ink: rgba(235, 238, 242, 0.92);
  --ink-dim: rgba(235, 238, 242, 0.45);
  --hairline: rgba(235, 238, 242, 0.18);
  --accent: #d8b46a;
  --panel-bg: rgba(4, 6, 10, 0.78);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #020308;
  font-family: "Helvetica Neue", Helvetica, "Segoe UI", Arial, sans-serif;
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
}

/* touch-action: none lets the app own all touch gestures (orbit, pinch). */
canvas { display: block; touch-action: none; }

/* Cinematic vignette over the 3D view */
#vignette {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(ellipse at center,
              rgba(0,0,0,0) 55%, rgba(0,0,0,0.55) 100%);
  z-index: 2;
}

/* ---- Title block, top left ---- */
#title {
  position: fixed;
  top: 34px;
  left: 40px;
  z-index: 5;
  pointer-events: none;
}
#title h1 {
  font-size: 15px;
  font-weight: 300;
  letter-spacing: 0.55em;
  text-transform: uppercase;
}
#title p {
  margin-top: 8px;
  font-size: 10px;
  font-weight: 300;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--ink-dim);
}
#title::after {
  content: "";
  display: block;
  width: 46px;
  height: 1px;
  margin-top: 14px;
  background: var(--accent);
}

/* ---- Info panel, right side ---- */
#info {
  position: fixed;
  top: 50%;
  right: 40px;
  transform: translateY(-50%) translateX(16px);
  width: 264px;
  z-index: 6;
  background: var(--panel-bg);
  border-left: 1px solid var(--accent);
  padding: 26px 24px 22px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.45s ease, transform 0.45s ease, visibility 0.45s;
  backdrop-filter: blur(6px);
}
#info.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(-50%) translateX(0);
}
#info .kicker {
  font-size: 9px;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--ink-dim);
}
#info h2 {
  margin: 10px 0 18px;
  font-size: 22px;
  font-weight: 200;
  letter-spacing: 0.32em;
  text-transform: uppercase;
}
#info .row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 9px 0;
  border-top: 1px solid var(--hairline);
  font-size: 11px;
}
#info .row .label {
  font-weight: 300;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-dim);
}
#info .row .value {
  font-weight: 300;
  letter-spacing: 0.06em;
  color: var(--ink);
  text-align: right;
}
#info #infoFact {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--hairline);
  font-size: 10.5px;
  font-weight: 300;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--ink-dim);
}
#info #infoFact:empty { display: none; }
#info #closeInfo {
  position: absolute;
  top: 10px;
  right: 12px;
  background: none;
  border: none;
  color: var(--ink-dim);
  font-size: 14px;
  font-weight: 200;
  cursor: pointer;
  padding: 4px 6px;
  letter-spacing: 0;
}
#info #closeInfo:hover { color: var(--ink); }

/* ---- Control bar, bottom ---- */
#controls {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 22px;
  padding: 14px 26px;
  background: var(--panel-bg);
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  backdrop-filter: blur(6px);
}
#pauseBtn {
  width: 34px;
  height: 34px;
  background: none;
  border: 1px solid var(--hairline);
  color: var(--ink);
  font-size: 10px;
  cursor: pointer;
  transition: border-color 0.25s ease, color 0.25s ease;
}
#pauseBtn:hover { border-color: var(--accent); color: var(--accent); }
#tourBtn, #todayBtn, #scaleBtn, #voyagerBtn {
  background: none;
  border: 1px solid var(--hairline);
  color: var(--ink-dim);
  font-size: 9px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  padding: 9px 12px;
  cursor: pointer;
  transition: border-color 0.25s ease, color 0.25s ease;
  white-space: nowrap;
}
#tourBtn:hover, #todayBtn:hover, #scaleBtn:hover, #voyagerBtn:hover { border-color: var(--accent); color: var(--accent); }
#tourBtn.active, #scaleBtn.active { border-color: var(--accent); color: var(--accent); }

/* ---- Screen-projected body name tags (real-scale mode, Voyager) ---- */
#tags { position: fixed; inset: 0; pointer-events: none; z-index: 3; }
.bodyTag {
  position: absolute;
  top: 0;
  left: 0;
  font-size: 9px;
  font-weight: 300;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--ink);
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.3s ease;
  will-change: transform;
}
.bodyTag.periTag {
  font-size: 8px;
  letter-spacing: 0.22em;
  color: var(--accent);
}
.bodyTag.constTag {
  font-size: 8px;
  letter-spacing: 0.45em;
  color: rgba(188, 210, 255, 0.9);
}

/* ---- Cinema mode: H key hides every UI layer over the 3D view ---- */
#title, #controls, #hint { transition: opacity 0.4s ease; }
body.cinema #title,
body.cinema #controls,
body.cinema #hint,
body.cinema #info,
body.cinema #hoverLabel {
  opacity: 0 !important;
  pointer-events: none;
}
#controls .date-group {
  display: flex;
  align-items: center;
  gap: 12px;
}
#simDate {
  min-width: 92px;
  font-size: 11px;
  font-weight: 300;
  letter-spacing: 0.08em;
  color: var(--ink);
  text-align: center;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
#controls .speed-group {
  display: flex;
  align-items: center;
  gap: 14px;
}
#controls label {
  font-size: 9px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--ink-dim);
}
#speedSlider {
  -webkit-appearance: none;
  appearance: none;
  width: 220px;
  height: 1px;
  /* Center notch marks the forward/backward boundary. */
  background: linear-gradient(90deg,
    var(--hairline) 0 calc(50% - 1px),
    var(--accent) calc(50% - 1px) calc(50% + 1px),
    var(--hairline) calc(50% + 1px) 100%);
  outline: none;
  cursor: pointer;
}
#speedSlider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 3px;
  height: 16px;
  background: var(--accent);
  cursor: ew-resize;
}
#speedSlider::-moz-range-thumb {
  width: 3px;
  height: 16px;
  border: none;
  border-radius: 0;
  background: var(--accent);
  cursor: ew-resize;
}
#speedValue {
  min-width: 52px;
  font-size: 11px;
  font-weight: 300;
  letter-spacing: 0.1em;
  color: var(--accent);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* ---- Hover label: body name following the cursor ---- */
#hoverLabel {
  position: fixed;
  z-index: 7;
  pointer-events: none;
  font-size: 10px;
  font-weight: 300;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--ink);
  padding-bottom: 3px;
  border-bottom: 1px solid var(--accent);
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.15s ease;
}
#hoverLabel.visible { opacity: 1; }

/* ---- Hint, bottom right ---- */
#hint {
  position: fixed;
  right: 40px;
  bottom: 34px;
  z-index: 4;
  font-size: 9px;
  font-weight: 300;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-dim);
  text-align: right;
  line-height: 2.1;
  pointer-events: none;
}

/* ---- Mobile layout: compact title, bottom-sheet panel, fluid bar ---- */
@media (max-width: 640px) {
  #title { top: 18px; left: 18px; }
  #title h1 { font-size: 12px; letter-spacing: 0.4em; }
  #title p { font-size: 8px; letter-spacing: 0.2em; }
  #hint { display: none; }
  #controls {
    left: 14px;
    right: 14px;
    bottom: 14px;
    transform: none;
    gap: 12px;
    padding: 10px 14px;
    flex-wrap: wrap;
    justify-content: center;
  }
  #controls .speed-group { flex: 1 1 100%; }
  #simDate { min-width: 0; }
  #speedSlider { width: auto; flex: 1; min-width: 0; }
  #info {
    top: auto;
    bottom: 122px; /* clears the two-row control bar */
    left: 14px;
    right: 14px;
    width: auto;
    padding: 20px 18px 16px;
    transform: translateY(12px);
  }
  #info.visible { transform: translateY(0); }
  #info h2 { font-size: 17px; margin-bottom: 12px; }
}