/* Layout: full-bleed 3D scene; instrument panels float on its edges like annotations on a drawing sheet. */
:root {
  --sky: #0b1220;
  --panel: rgba(13, 21, 36, 0.82);
  --panel-solid: #111a2c;
  --fg: #e7ecf3;
  --muted: #93a0b4;
  --line: rgba(160, 180, 210, 0.18);
  --accent: #f2b84b;
  --accent-ink: #1b1306;
  --focus: #8fc7ff;
  --font-display: "Barlow Condensed", "Arial Narrow", "Roboto Condensed", sans-serif;
  --font-body: "IBM Plex Sans", "Segoe UI", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
  --gutter: 16px;
  --radius: 10px;
  color-scheme: dark;
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --sky: #dfe8f2;
    --panel: rgba(250, 252, 255, 0.88);
    --panel-solid: #f7f9fc;
    --fg: #142033;
    --muted: #55637a;
    --line: rgba(20, 40, 70, 0.14);
    --accent: #b9770e;
    --accent-ink: #fffaf0;
    --focus: #1f6fd1;
    color-scheme: light;
  }
}
:root[data-theme="light"] {
  --sky: #dfe8f2;
  --panel: rgba(250, 252, 255, 0.88);
  --panel-solid: #f7f9fc;
  --fg: #142033;
  --muted: #55637a;
  --line: rgba(20, 40, 70, 0.14);
  --accent: #b9770e;
  --accent-ink: #fffaf0;
  --focus: #1f6fd1;
  color-scheme: light;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { height: 100%; }
body {
  margin: 0;
  overflow: hidden;
  background: var(--sky);
  color: var(--fg);
  font: 14px/1.45 var(--font-body);
}
body.moving-imagery #scene { cursor: grab; }
body.moving-imagery.dragging #scene { cursor: grabbing; }
#scene { position: fixed; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; }

.eyebrow {
  font: 600 0.72rem/1 var(--font-display);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
h1, h2 { font-family: var(--font-display); margin: 0; text-wrap: balance; }

.masthead, .steps, .card, .site, .transport, .tooltip {
  position: fixed;
  background: var(--panel);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--line);
}

.masthead {
  top: calc(env(safe-area-inset-top, 0px) + 12px);
  left: var(--gutter);
  right: var(--gutter);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 20px;
  padding: 10px 14px;
  border-radius: var(--radius);
  background: transparent;
  border-color: transparent;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  pointer-events: none;
}
.masthead > * { pointer-events: auto; }
.brand { display: grid; gap: 4px; text-shadow: 0 1px 12px rgba(0, 0, 0, 0.35); }
.brand h1 { font-size: 2rem; font-weight: 700; line-height: 0.95; letter-spacing: 0.01em; }
.toolbar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }

.field {
  display: flex; align-items: center; gap: 8px;
  padding: 4px 6px 4px 10px;
  border-radius: 8px;
  background: var(--panel);
  border: 1px solid var(--line);
}
.field > span { font: 600 0.72rem var(--font-display); letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }

select, input[type="text"], input[type="number"] {
  font: inherit;
  color: var(--fg);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 5px 8px;
  min-width: 0;
}
select option { background: var(--panel-solid); color: var(--fg); }
.field select { border: 0; padding: 4px 2px; }

.btn {
  font: 600 0.82rem/1 var(--font-body);
  color: var(--fg);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 12px;
  cursor: pointer;
}
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.ghost { background: transparent; }
.btn[aria-pressed="true"] { border-color: var(--accent); color: var(--accent); }
:is(button, select, input, summary):focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }

/* Step list */
.steps {
  top: calc(env(safe-area-inset-top, 0px) + 92px);
  left: var(--gutter);
  width: 268px;
  max-height: calc(100% - 92px - 300px);
  overflow: auto;
  border-radius: var(--radius);
  padding: 6px;
}
.steps-toggle { display: none; }
.steps ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 1px; counter-reset: step; }
.steps li button {
  width: 100%;
  display: grid;
  grid-template-columns: 2.1em 1fr;
  align-items: baseline;
  gap: 6px;
  text-align: left;
  font: 500 0.86rem/1.25 var(--font-body);
  color: var(--muted);
  background: transparent;
  border: 0;
  border-radius: 6px;
  padding: 6px 8px;
  cursor: pointer;
}
.steps li button .n { font: 500 0.75rem var(--font-mono); font-variant-numeric: tabular-nums; }
.steps li button:hover { color: var(--fg); background: var(--line); }
.steps li.done button { color: var(--fg); }
.steps li.done button .n { color: var(--accent); }
.steps li.current button { color: var(--accent-ink); background: var(--accent); }
.steps li.current button .n { color: inherit; }
.steps li.strike { border-top: 1px solid var(--line); margin-top: 4px; padding-top: 4px; }

/* Current step card */
.card {
  left: var(--gutter);
  bottom: calc(env(safe-area-inset-bottom, 0px) + 84px);
  width: min(420px, calc(100% - 2 * var(--gutter)));
  border-radius: var(--radius);
  padding: 14px 16px;
  display: grid;
  gap: 6px;
}
.card-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.link-btn {
  font: 500 0.78rem var(--font-body);
  color: var(--muted);
  background: none;
  border: 0;
  padding: 2px 0;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.link-btn:hover { color: var(--fg); }
.card.collapsed #cardText, .card.collapsed .readout { display: none; }
.card h2 { font-size: 1.55rem; font-weight: 600; line-height: 1.05; }
.card p { margin: 0; color: var(--fg); max-width: 60ch; }
.readout {
  margin: 6px 0 0;
  padding-top: 8px;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 6px;
}
.readout div { display: grid; gap: 2px; min-width: 0; }
.readout dt { font: 600 0.68rem var(--font-display); letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }
.readout dd { margin: 0; font: 500 0.86rem var(--font-mono); font-variant-numeric: tabular-nums; white-space: nowrap; }

/* Site panel */
.site {
  top: calc(env(safe-area-inset-top, 0px) + 80px);
  right: var(--gutter);
  width: min(340px, calc(100% - 2 * var(--gutter)));
  max-height: calc(100% - 180px);
  overflow: auto;
  border-radius: var(--radius);
  padding: 14px 16px;
  display: grid;
  gap: 12px;
  z-index: 5;
}
.site-head { display: flex; justify-content: space-between; align-items: center; }
.site h2 { font-size: 1.35rem; font-weight: 600; }
.site .hint, .status, .attribution { margin: 0; color: var(--muted); font-size: 0.82rem; }
.status:empty, .attribution:empty { display: none; }
.status.error { color: #ff8f7a; }
.stack { display: grid; gap: 5px; }
.stack > span { display: flex; justify-content: space-between; font-weight: 500; font-size: 0.84rem; }
.row { display: flex; flex-wrap: wrap; gap: 8px; }
details { border-top: 1px solid var(--line); padding-top: 10px; display: grid; gap: 10px; }
details[open] { display: grid; }
summary { cursor: pointer; font-weight: 500; }
input[type="range"] { width: 100%; accent-color: var(--accent); }

/* Transport */
.transport {
  left: 0; right: 0; bottom: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px var(--gutter) calc(env(safe-area-inset-bottom, 0px) + 10px);
  border-width: 1px 0 0;
}
.icon-btn {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  flex: none;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--fg);
  cursor: pointer;
}
.icon-btn svg { width: 18px; height: 18px; fill: currentColor; }
.icon-btn.play { width: 48px; height: 48px; background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.icon-btn.play .i-pause { display: none; }
.icon-btn.play.playing .i-play { display: none; }
.icon-btn.play.playing .i-pause { display: block; }
.scrub { position: relative; flex: 1; min-width: 80px; display: grid; align-items: center; }
.scrub input { margin: 0; position: relative; z-index: 1; }
.ticks { position: absolute; inset: 0 8px; pointer-events: none; }
.ticks span { position: absolute; top: 50%; width: 1px; height: 14px; margin-top: -7px; background: var(--muted); opacity: 0.55; }
.clock { color: var(--muted); min-width: 4.5ch; text-align: right; }
.transport select { flex: none; }

.tooltip {
  z-index: 10;
  pointer-events: none;
  border-radius: 6px;
  padding: 6px 9px;
  font-size: 0.8rem;
  max-width: 280px;
  background: var(--panel-solid);
}
.tooltip b { display: block; font-weight: 600; }
.tooltip span { color: var(--muted); }

.loading {
  position: fixed; inset: 0;
  display: grid; place-items: center;
  font: 600 1.1rem var(--font-display);
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--muted);
  background: var(--sky);
  z-index: 20;
}
.loading[hidden] { display: none; }

@media (max-width: 760px) {
  .brand h1 { font-size: 1.5rem; }
  .masthead { top: calc(env(safe-area-inset-top, 0px) + 8px); padding: 4px 0; align-items: flex-start; }
  .toolbar { gap: 6px; }
  .field { padding: 2px 4px; }
  .field > span { display: none; }
  .toolbar .btn { padding: 8px 10px; }
  .steps {
    top: auto;
    bottom: calc(env(safe-area-inset-bottom, 0px) + 72px);
    left: var(--gutter); right: var(--gutter);
    width: auto;
    max-height: 55%;
    padding: 2px 4px;
    z-index: 4;
  }
  .steps-toggle {
    display: flex; justify-content: space-between; width: 100%;
    font: 600 0.82rem var(--font-body); color: var(--fg);
    background: transparent; border: 0; padding: 7px 10px; cursor: pointer;
  }
  .steps ol { display: none; }
  .steps.open ol { display: grid; }
  .card {
    bottom: calc(env(safe-area-inset-bottom, 0px) + 122px);
    padding: 10px 12px;
    gap: 4px;
  }
  .steps.open ~ .card { display: none; }
  .card h2 { font-size: 1.2rem; }
  .card p { font-size: 0.84rem; }
  .readout { gap: 4px; padding-top: 6px; }
  .readout dt { font-size: 0.6rem; }
  .readout dd { font-size: 0.74rem; }
  .transport { gap: 6px; }
  .transport .follow, .transport select, .clock { display: none; }
  .icon-btn { width: 36px; height: 36px; }
  .icon-btn.play { width: 44px; height: 44px; }
  .site { top: auto; bottom: calc(env(safe-area-inset-bottom, 0px) + 72px); max-height: 70%; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto; }
}