:root {
  color-scheme: dark;
  --bg: #06090d;
  --panel: rgba(9, 13, 18, 0.72);
  --panel-solid: #0b1016;
  --ink: #e9eff6;
  --dim: #8b98a6;
  --faint: rgba(255, 255, 255, 0.10);
  --accent: #7cc4ff;
  --radius: 12px;
  /* Distance from the visible bottom edge: page margin + system bar + any
     browser chrome the layout viewport sits under. --bottom-gap is measured
     from the visual viewport in app.js. */
  --dock-bottom: calc(18px + env(safe-area-inset-bottom, 0px) + var(--bottom-gap, 0px));
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

/* The transport and sheet are toggled with the hidden attribute; a class rule
   that sets display would otherwise win over the browser's [hidden] rule. */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

#map {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  cursor: grab;
  touch-action: none;
}
#map.dragging { cursor: grabbing; }

/* ---------- brand ---------- */
.brand {
  position: fixed;
  top: calc(18px + env(safe-area-inset-top, 0px));
  left: calc(18px + env(safe-area-inset-left, 0px));
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px 10px 12px;
  background: var(--panel);
  border: 1px solid var(--faint);
  border-radius: var(--radius);
  backdrop-filter: blur(14px) saturate(1.3);
  -webkit-backdrop-filter: blur(14px) saturate(1.3);
  user-select: none;
}
.brand-mark { color: var(--accent); display: flex; opacity: .95; }
.brand-text h1 {
  margin: 0;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .01em;
}
.brand-text h1 span { color: var(--dim); font-weight: 400; }
.brand-text p {
  margin: 2px 0 0;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .06em;
  color: var(--dim);
  text-transform: uppercase;
}

/* ---------- layers ---------- */
.layers {
  position: fixed;
  top: calc(18px + env(safe-area-inset-top, 0px));
  right: calc(18px + env(safe-area-inset-right, 0px));
  display: flex;
  gap: 4px;
  padding: 4px;
  background: var(--panel);
  border: 1px solid var(--faint);
  border-radius: var(--radius);
  backdrop-filter: blur(14px) saturate(1.3);
  -webkit-backdrop-filter: blur(14px) saturate(1.3);
}
.layers button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--dim);
  font: 500 12.5px/1 var(--font);
  letter-spacing: .01em;
  padding: 9px 14px;
  border-radius: 9px;
  cursor: pointer;
  transition: background .18s, color .18s;
  white-space: nowrap;
}
.layers button:hover { color: var(--ink); }
.layers button[aria-pressed="true"] {
  background: rgba(124, 196, 255, 0.14);
  color: var(--accent);
  box-shadow: inset 0 0 0 1px rgba(124, 196, 255, 0.22);
}

/* ---------- toolbar ---------- */
.toolbar {
  position: fixed;
  right: calc(18px + env(safe-area-inset-right, 0px));
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 5px;
  background: var(--panel);
  border: 1px solid var(--faint);
  border-radius: var(--radius);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}
.toolbar button {
  width: 38px;
  height: 38px;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: var(--ink);
  font-size: 17px;
  font-family: var(--font);
  cursor: pointer;
  transition: background .16s, color .16s;
  display: grid;
  place-items: center;
}
.toolbar button:hover { background: rgba(255, 255, 255, 0.07); }
.toolbar button:active { background: rgba(255, 255, 255, 0.12); }
.toolbar button#info { font-family: Georgia, serif; font-style: italic; font-size: 15px; color: var(--dim); }

/* ---------- readout ---------- */
.readout {
  position: fixed;
  left: calc(18px + env(safe-area-inset-left, 0px));
  bottom: var(--dock-bottom);
  padding: 11px 14px;
  background: var(--panel);
  border: 1px solid var(--faint);
  border-radius: var(--radius);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  font-family: var(--mono);
  font-size: 11.5px;
  min-width: 158px;
}
.ro-row { display: flex; justify-content: space-between; gap: 16px; line-height: 1.65; }
.ro-k { color: var(--dim); letter-spacing: .08em; font-size: 10px; }
.ro-v { color: var(--ink); font-variant-numeric: tabular-nums; }

/* ---------- scale bar ---------- */
.scalebar {
  position: fixed;
  right: calc(18px + env(safe-area-inset-right, 0px));
  bottom: var(--dock-bottom);
  padding: 9px 13px 8px;
  background: var(--panel);
  border: 1px solid var(--faint);
  border-radius: var(--radius);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--dim);
  text-align: right;
  user-select: none;
}
.sb-line {
  height: 3px;
  background: linear-gradient(90deg, rgba(255,255,255,.25), rgba(255,255,255,.85));
  border-radius: 2px;
  margin-bottom: 6px;
  margin-left: auto;
  transition: width .12s linear;
}

/* ---------- layer legend ---------- */
.legend {
  position: fixed;
  top: calc(70px + env(safe-area-inset-top, 0px));
  right: calc(18px + env(safe-area-inset-right, 0px));
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 9px 12px;
  background: var(--panel);
  border: 1px solid var(--faint);
  border-radius: var(--radius);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  font-size: 10.5px;
  color: var(--dim);
  user-select: none;
}
.legend i {
  display: inline-block;
  width: 9px; height: 9px;
  border-radius: 2px;
  margin-right: 7px;
  vertical-align: -1px;
  box-shadow: 0 0 0 1px rgba(0,0,0,.35);
}

/* ---------- timeline transport ---------- */
.transport {
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  bottom: var(--dock-bottom);
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 8px;
  background: var(--panel);
  border: 1px solid var(--faint);
  border-radius: var(--radius);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  width: min(560px, calc(100vw - 400px));
  z-index: 4;
  user-select: none;
}
.transport button {
  border: 0;
  background: transparent;
  color: var(--ink);
  width: 30px; height: 30px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 15px;
  line-height: 1;
  display: grid;
  place-items: center;
  flex: none;
}
.transport button:hover { background: rgba(255,255,255,0.08); }
.transport button:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
.tl-spans {
  display: flex;
  gap: 2px;
  padding: 2px;
  border-radius: 8px;
  background: rgba(255,255,255,0.05);
  flex: none;
}
.transport button.tl-span {
  width: auto;
  height: 24px;
  padding: 0 7px;
  font: 600 10px/1 var(--mono);
  letter-spacing: .02em;
  color: var(--dim);
  border-radius: 6px;
}
.transport button.tl-span[aria-pressed="true"] {
  background: rgba(124,196,255,0.16);
  color: var(--accent);
  box-shadow: inset 0 0 0 1px rgba(124,196,255,0.28);
}
.tl-track { flex: 1 1 auto; min-width: 0; display: flex; align-items: center; }
.tl-track input {
  width: 100%;
  margin: 0;
  accent-color: var(--accent);
  cursor: pointer;
}
.tl-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  line-height: 1.15;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--dim);
  flex: none;
  min-width: 66px;
}
.tl-meta b { color: var(--ink); font-weight: 500; font-size: 11px; font-variant-numeric: tabular-nums; white-space: nowrap; }
.transport button.chip {
  flex: none;
  width: auto;
  height: 26px;
  border: 1px solid var(--faint);
  background: transparent;
  color: var(--dim);
  font: 600 9.5px/1 var(--mono);
  letter-spacing: .08em;
  padding: 6px 9px;
  border-radius: 99px;
  cursor: pointer;
  white-space: nowrap;
}
.chip.on { color: var(--accent); border-color: rgba(124,196,255,.45); background: rgba(124,196,255,.12); }
.chip:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

body.has-timeline .hint { bottom: calc(var(--dock-bottom) + 58px); }

/* ---------- load indicator ---------- */
.dot {
  display: inline-block;
  width: 5px; height: 5px;
  margin-left: 7px;
  border-radius: 50%;
  background: var(--accent);
  vertical-align: middle;
  animation: pulse 1.15s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: .25; transform: scale(.8); }
  50% { opacity: 1; transform: scale(1.15); }
}

/* ---------- sheet ---------- */
.sheet {
  position: fixed;
  top: 0; right: 0; bottom: 0;
  width: min(420px, 100vw);
  background: rgba(7, 10, 14, 0.94);
  border-left: 1px solid var(--faint);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  padding: 26px 26px 40px;
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform .34s cubic-bezier(.32,.72,0,1);
  z-index: 20;
}
.sheet.open { transform: translateX(0); }
.sheet h2 { margin: 6px 0 14px; font-size: 19px; font-weight: 600; letter-spacing: -.01em; }
.sheet h3 { margin: 24px 0 6px; font-size: 12px; text-transform: uppercase; letter-spacing: .1em; color: var(--accent); font-weight: 600; }
.sheet p { margin: 0 0 10px; font-size: 13.5px; line-height: 1.6; color: #b9c5d2; }
.sheet .lede { color: var(--ink); font-size: 14px; }
.sheet em { font-style: normal; color: var(--accent); }
.sheet code { font-family: var(--mono); font-size: 11.5px; background: rgba(255,255,255,.06); padding: 2px 5px; border-radius: 4px; }
.sheet dl { display: grid; grid-template-columns: auto 1fr; gap: 8px 18px; margin: 18px 0 0; font-size: 12.5px; }
.sheet dt { color: var(--dim); }
.sheet dd { margin: 0; font-family: var(--mono); font-size: 11.5px; color: var(--ink); }
.sheet-x {
  position: absolute;
  top: 16px; right: 16px;
  width: 32px; height: 32px;
  border-radius: 8px;
  border: 0;
  background: rgba(255,255,255,.06);
  color: var(--ink);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
}
.sheet-x:hover { background: rgba(255,255,255,.12); }

/* ---------- hint ---------- */
.hint {
  position: fixed;
  bottom: 22px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 11.5px;
  color: var(--dim);
  background: var(--panel);
  padding: 7px 14px;
  border-radius: 99px;
  border: 1px solid var(--faint);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: opacity .8s;
  pointer-events: none;
  white-space: nowrap;
}
.hint.gone { opacity: 0; }

@media (max-width: 640px) {
  .brand { top: calc(12px + env(safe-area-inset-top, 0px)); left: calc(12px + env(safe-area-inset-left, 0px)); padding: 8px 12px 8px 10px; }
  .brand-text h1 { font-size: 13.5px; }
  :root { --dock-bottom: calc(12px + env(safe-area-inset-bottom, 0px) + var(--bottom-gap, 0px)); }
  .layers {
    top: auto;
    bottom: calc(var(--dock-bottom) + 172px);
    right: calc(12px + env(safe-area-inset-right, 0px));
    left: calc(12px + env(safe-area-inset-left, 0px));
    justify-content: center;
  }
  .layers button { flex: 1; }
  .toolbar { right: calc(12px + env(safe-area-inset-right, 0px)); top: 50%; }
  .legend {
    top: calc(76px + env(safe-area-inset-top, 0px));
    right: calc(12px + env(safe-area-inset-right, 0px));
  }
  .transport {
    left: calc(12px + env(safe-area-inset-left, 0px));
    right: calc(12px + env(safe-area-inset-right, 0px));
    transform: none;
    width: auto;
    bottom: calc(var(--dock-bottom) + 86px);
    gap: 4px;
    padding: 4px 6px;
    /* the span buttons and the transport do not fit on one phone row, so the
       scrubber drops to its own line rather than collapsing to a stub */
    flex-wrap: wrap;
    row-gap: 2px;
  }
  .transport button { width: 30px; height: 30px; }
  .tl-track { flex: 1 1 100%; order: 10; }
  .tl-meta { min-width: 54px; }
  body.has-timeline .hint { display: none; }
  .readout { left: calc(12px + env(safe-area-inset-left, 0px)); }
  .scalebar { right: calc(12px + env(safe-area-inset-right, 0px)); }
  .hint { display: none; }
}