/* GalaxyRVR build page. Plain CSS, no build step. Content is capped at --wide (64rem) and centred.
   The tokens are the same as the SO-101 study page, so the two read as one site.
   Dark by default; html[data-theme="light"] switches to the light palette. */

:root {
  --bg: #0e1318;
  --bg-raised: #151b21;
  --ink: #e6ecf1;
  --muted: #8d99a5;
  --line: #242d36;
  --line-strong: #4a5663;
  --grid: rgba(230, 236, 241, 0.035);
  --accent: #ff7a1a;
  --accent-ink: #ff9a4d;
  --measure: 40rem;
  --wide: 64rem;
  --ok: #6fb1f7;
  /* Go-to runs: categorical slots 1-3 of the reference palette, dark steps (validated on --bg-raised). */
  --run-1: #3987e5;
  --run-2: #d95926;
  --run-3: #199e70;
  --route: rgba(230, 236, 241, 0.42);
  color-scheme: dark;
}

html[data-theme="light"] {
  --bg: #f4f6f8;
  --bg-raised: #e8ecef;
  --ink: #161c22;
  --muted: #56616b;
  --line: #d5dbe0;
  --line-strong: #9aa5af;
  --grid: rgba(22, 28, 34, 0.045);
  --accent: #f26a0c;
  --accent-ink: #b0470a;
  --ok: #1e6bd0;
  --run-1: #2a78d6;
  --run-2: #eb6834;
  --run-3: #1baf7a;
  --route: rgba(22, 28, 34, 0.4);
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; background: var(--bg); scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: system-ui, -apple-system, "SF Pro Text", "Segoe UI Variable Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.site-header, main, .site-footer {
  max-width: var(--wide);
  margin: 0 auto;
  padding-left: 1rem;
  padding-right: 1rem;
}

h1, h2, h3 { margin: 0; line-height: 1.15; font-weight: 600; letter-spacing: -0.02em; }
h1 { font-size: clamp(1.9rem, 6vw, 2.6rem); letter-spacing: -0.035em; }
h2 { font-size: clamp(1.2rem, 3.2vw, 1.45rem); margin-bottom: 0.6rem; }
h3 { font-size: 1rem; margin: 1.25rem 0 0.4rem; }
p { margin: 0 0 1rem; }
ul, ol { margin: 0 0 1rem; padding-left: 1.25rem; }
li { margin: 0 0 0.35rem; }

a {
  color: inherit;
  text-decoration-line: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 0.22em;
}
a:hover { color: var(--accent-ink); }
a:focus-visible, button:focus-visible, video:focus-visible, summary:focus-visible, canvas:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.86em;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  padding: 0.05em 0.35em;
  border-radius: 3px;
  overflow-wrap: anywhere;
}

.num { font-variant-numeric: tabular-nums; }

/* Header: the faint grid, like the study page. */

.site-header {
  padding-top: 1.5rem;
  padding-bottom: 1.25rem;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 2rem 2rem;
  background-position: -1px -1px;
}
@media (min-width: 40rem) { .site-header { padding-top: 2.5rem; padding-bottom: 1.75rem; } }
.topline {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  margin-bottom: 1.25rem;
}
.kicker { margin: 0; color: var(--muted); font-size: 0.9rem; min-width: 0; padding-top: 0.3rem; }
.lede { font-size: 1.05rem; max-width: 46rem; margin-top: 0.9rem; }
.context { color: var(--muted); max-width: 46rem; margin-bottom: 0; }

.theme-toggle {
  flex: none;
  font: inherit;
  font-size: 0.85rem;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.3rem 0.85rem;
  cursor: pointer;
}
.theme-toggle:hover { color: var(--ink); border-color: var(--line-strong); }

.toc { display: flex; flex-wrap: wrap; gap: 0.35rem 1.1rem; list-style: none; padding: 0; margin: 1.1rem 0 0; font-size: 0.9rem; }
.toc li { margin: 0; }
.toc a { color: var(--muted); }
.toc a:hover { color: var(--ink); }

/* Sections */

section.band { padding: 1.9rem 0 0.9rem; border-top: 1px solid var(--line); }
.band > p, .band > ul, .band > ol { max-width: var(--measure); }
.band .muted, .muted { color: var(--muted); }

figure { margin: 0; }
figcaption { font-size: 0.84rem; color: var(--muted); margin-top: 0.45rem; }
img, video { display: block; width: 100%; height: auto; border-radius: 2px; background: var(--bg-raised); }

/* Corner ticks, as on the study page. */
.frame { position: relative; padding: 7px; }
.frame::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  --c: var(--line-strong);
  background:
    linear-gradient(var(--c), var(--c)) top left / 14px 1px no-repeat,
    linear-gradient(var(--c), var(--c)) top left / 1px 14px no-repeat,
    linear-gradient(var(--c), var(--c)) top right / 14px 1px no-repeat,
    linear-gradient(var(--c), var(--c)) top right / 1px 14px no-repeat,
    linear-gradient(var(--c), var(--c)) bottom left / 14px 1px no-repeat,
    linear-gradient(var(--c), var(--c)) bottom left / 1px 14px no-repeat,
    linear-gradient(var(--c), var(--c)) bottom right / 14px 1px no-repeat,
    linear-gradient(var(--c), var(--c)) bottom right / 1px 14px no-repeat;
}

/* Hero: the rover and the garden clip */

.hero { display: grid; gap: 1rem; grid-template-columns: minmax(0, 1fr); padding: 0.5rem 0 1.5rem; }
@media (min-width: 52rem) { .hero { grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr); align-items: start; } }

.facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9.5rem, 1fr));
  gap: 0.75rem 1.25rem;
  margin: 0 0 1.25rem;
  padding: 0;
}
.facts div { min-width: 0; border-left: 2px solid var(--accent); padding-left: 0.7rem; }
.facts dt { font-size: 0.74rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.facts dd { margin: 0; font-size: 1.15rem; font-weight: 600; font-variant-numeric: tabular-nums; }
.facts dd small { display: block; font-size: 0.8rem; font-weight: 400; color: var(--muted); }

/* Photo grids */

.gallery { columns: 3 13rem; column-gap: 1rem; }
.gallery figure { break-inside: avoid; margin: 0 0 1rem; }
.pair { display: grid; gap: 1rem; grid-template-columns: minmax(0, 1fr); max-width: 60rem; margin: 0 0 1rem; }
@media (min-width: 40rem) { .pair { grid-template-columns: 1fr 1fr; } }
.trio { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr)); margin: 0 0 1rem; }

/* The 3D viewer */

.viewer-wrap { display: grid; gap: 1rem; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 62rem) { .viewer-wrap { grid-template-columns: minmax(0, 1.7fr) minmax(17rem, 1fr); align-items: start; } }
.stage { position: relative; }
.stage canvas { display: block; width: 100%; height: clamp(20rem, 58vh, 34rem); background: var(--bg-raised); border-radius: 2px; touch-action: none; cursor: grab; }
.stage canvas:active { cursor: grabbing; }
.stage .hint { position: absolute; left: 1.1rem; bottom: 0.9rem; margin: 0; font-size: 0.78rem; color: var(--muted); pointer-events: none; }
.tip {
  position: absolute;
  z-index: 2;
  pointer-events: none;
  background: var(--bg);
  color: var(--ink);
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  padding: 0.4rem 0.6rem;
  font-size: 0.82rem;
  line-height: 1.4;
  max-width: 17rem;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.25);
}
.tip span { display: block; color: var(--muted); }

.panel {
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 1rem 1.1rem 1.1rem;
  min-width: 0;
}
.panel h3 { margin-top: 0; }
.control-label { display: block; font-size: 0.74rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); margin: 0 0 0.35rem; }
.seg, .chips { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 0.9rem; }
.seg button, .chips button, .btn {
  font: inherit;
  font-size: 0.88rem;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 0.3rem 0.8rem;
  min-height: 2.1rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  line-height: 1.2;
  text-decoration: none;
}
.seg button:hover, .chips button:hover, .btn:hover { border-color: var(--ink); color: var(--ink); }
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.chips button[aria-pressed="false"] { color: var(--muted); border-style: dashed; }
.swatch { width: 0.7rem; height: 0.7rem; border-radius: 2px; flex: none; }
.parts-list { list-style: none; padding: 0; margin: 0; font-size: 0.88rem; }
.parts-list li { display: grid; grid-template-columns: 1fr auto; gap: 0.2rem 0.75rem; padding: 0.55rem 0; border-top: 1px solid var(--line); margin: 0; }
.parts-list li:first-child { border-top: 0; }
.parts-list .dl { display: flex; gap: 0.35rem; }
.parts-list .dl a { font-size: 0.8rem; color: var(--muted); }
.parts-list small { grid-column: 1 / -1; color: var(--muted); }

/* Tables */

.table-wrap { overflow-x: auto; margin: 0 0 1rem; }
table { border-collapse: collapse; width: 100%; font-size: 0.88rem; }
th, td { text-align: left; padding: 0.45rem 0.9rem 0.45rem 0; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; white-space: nowrap; }
td.num, th.num { text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; }
td small { color: var(--muted); }
tr.group td { color: var(--muted); font-size: 0.74rem; letter-spacing: 0.06em; text-transform: uppercase; padding-top: 1rem; border-bottom-color: var(--line-strong); }
tfoot td { font-weight: 600; border-bottom: 0; }

/* Assembly steps */

.steps { counter-reset: step; list-style: none; padding: 0; max-width: 52rem; }
.steps > li { counter-increment: step; position: relative; padding: 0 0 0.9rem 2.6rem; margin: 0; }
.steps > li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: -0.05rem;
  width: 1.8rem;
  height: 1.8rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  display: grid;
  place-items: center;
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
  color: var(--muted);
}
.steps strong { font-weight: 600; }

/* Notes and warnings */

.note {
  max-width: var(--measure);
  margin: 0 0 1rem;
  padding: 0.6rem 0.8rem;
  border-left: 2px solid var(--accent);
  background: var(--bg-raised);
  border-radius: 0 3px 3px 0;
  font-size: 0.93rem;
}

/* Power diagram */

.diagram { max-width: 52rem; margin: 0 0 1rem; }
.diagram svg { display: block; width: 100%; height: auto; }
.diagram .box { fill: var(--bg-raised); stroke: var(--line-strong); stroke-width: 1; }
.diagram .box.pi { stroke: var(--ok); }
.diagram .box.rover { stroke: var(--accent); }
.diagram text { fill: var(--ink); font-family: inherit; font-size: 13px; }
.diagram text.sub { fill: var(--muted); font-size: 11px; }
.diagram .wire { stroke: var(--line-strong); stroke-width: 1.5; fill: none; }
.diagram .wire.power-pi { stroke: var(--ok); }
.diagram .wire.power-rover { stroke: var(--accent); }
.diagram .wire.data { stroke-dasharray: 4 4; }
.diagram .cut { stroke: var(--ink); stroke-width: 2; }

/* Pin check table in the cable section */
.checks td:first-child { white-space: nowrap; }
.pass { color: var(--ok); font-weight: 600; }

/* Timeline */

.timeline { list-style: none; padding: 0; max-width: 52rem; }
.timeline li { display: grid; grid-template-columns: 6.5rem minmax(0, 1fr); gap: 0.2rem 1rem; padding: 0.55rem 0; border-top: 1px solid var(--line); margin: 0; }
.timeline time { color: var(--muted); font-size: 0.88rem; font-variant-numeric: tabular-nums; padding-top: 0.05rem; }
@media (max-width: 30rem) { .timeline li { grid-template-columns: minmax(0, 1fr); } }

/* Lidar map */

#map2d { display: block; width: 100%; height: auto; background: var(--bg-raised); border-radius: 2px; }
#map2d .grid-img { image-rendering: pixelated; }
html[data-theme="light"] #map2d .grid-img { filter: invert(1); }
#map2d .route { fill: none; stroke: var(--route); stroke-width: 1.5; stroke-linejoin: round; vector-effect: non-scaling-stroke; }
#map2d .run { fill: none; stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; vector-effect: non-scaling-stroke; }
#map2d .run.r1 { stroke: var(--run-1); } #map2d .run.r2 { stroke: var(--run-2); } #map2d .run.r3 { stroke: var(--run-3); }
#map2d .goal { fill: none; stroke: var(--ink); stroke-width: 1; vector-effect: non-scaling-stroke; }
#map2d .stop { stroke: var(--bg-raised); stroke-width: 2; vector-effect: non-scaling-stroke; }
#map2d .stop.r1 { fill: var(--run-1); } #map2d .stop.r2 { fill: var(--run-2); } #map2d .stop.r3 { fill: var(--run-3); }
#map2d .goal-label { fill: var(--ink); font: 600 170px system-ui, sans-serif; paint-order: stroke; stroke: var(--bg-raised); stroke-width: 40px; }
#map2d .keepout { fill: url(#hatch); stroke: var(--ink); stroke-dasharray: 4 3; stroke-width: 1; vector-effect: non-scaling-stroke; opacity: 0.75; }
#map2d .hatch-line { stroke: var(--muted); stroke-width: 14; }
#map2d .home { fill: var(--accent); }
#map2d .scale { stroke: var(--muted); stroke-width: 1.5; vector-effect: non-scaling-stroke; }
#map2d .scale-label, #map2d .home-label { fill: var(--muted); font: 140px system-ui, sans-serif; }
#map2d .hit { fill: none; stroke: transparent; stroke-width: 16; pointer-events: stroke; cursor: default; vector-effect: non-scaling-stroke; }
#map2d .hit-goal { fill: transparent; pointer-events: all; }
#map2d g[hidden] { display: none; }
.key { display: flex; flex-wrap: wrap; gap: 0.35rem 1.1rem; list-style: none; padding: 0; margin: 0 0 0.9rem; font-size: 0.85rem; color: var(--muted); }
.key li { display: flex; align-items: center; gap: 0.45rem; margin: 0; }
.swatch.route { background: var(--route); height: 2px; }
.swatch.runs { background: linear-gradient(90deg, var(--run-1) 0 33%, var(--run-2) 33% 66%, var(--run-3) 66%); }
.swatch.keepouts { border: 1px dashed var(--ink); }
.swatch.line { height: 3px; width: 1.1rem; border-radius: 2px; }
.swatch.depth-fused { background: linear-gradient(90deg, #6b5b4c, #a99b86, #d8d2c6); }
.swatch.depth-lidar { background: var(--accent); }
.swatch.depth-path { background: var(--ink); height: 2px; }
.small { font-size: 0.84rem; }
.narrow { max-width: 44rem; }
.mini-facts { display: grid; gap: 0.45rem; margin: 0 0 0.9rem; }
.mini-facts dt { font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.mini-facts dd { margin: 0; }

.site-footer {
  padding-top: 1.25rem;
  padding-bottom: 3rem;
  border-top: 1px solid var(--line);
  font-size: 0.85rem;
  color: var(--muted);
}
.site-footer p { max-width: 52rem; margin: 0 0 0.6rem; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

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