:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --ink: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --accent: #2563eb;
  --accent-soft: #e0e7ff;
  --warn: #b45309;
  --error: #b91c1c;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --panel: #111a2e;
    --ink: #e2e8f0;
    --muted: #94a3b8;
    --line: #1e293b;
    --accent: #60a5fa;
    --accent-soft: #1e293b;
    --warn: #fbbf24;
    --error: #f87171;
  }
}
* { box-sizing: border-box; }
/* hidden means hidden, whatever display a class gives */
[hidden] { display: none !important; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 16px; }
h1 { margin: 28px 0 8px; font-size: 2rem; letter-spacing: -0.02em; line-height: 1.2; }
a { color: var(--accent); }

header.top { background: var(--panel); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 5; }
.bar { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; min-height: 56px; }
.brand { font-weight: 700; color: var(--ink); text-decoration: none; letter-spacing: -0.01em; }
nav { display: flex; gap: 4px; flex-wrap: wrap; }
nav a { color: var(--muted); text-decoration: none; padding: 6px 10px; border-radius: 8px; font-size: 0.95rem; }
nav a:hover { color: var(--ink); background: var(--accent-soft); }
nav a[aria-current] { color: var(--accent); background: var(--accent-soft); font-weight: 600; }
.bar .status { margin: 0 0 0 auto; }
.intro h1 { margin-top: 32px; }
.crumbs { margin: 20px 0 0; color: var(--muted); font-size: 0.9rem; }

.button {
  display: inline-flex; align-items: center; gap: 6px;
  font: inherit; font-size: 0.9rem; font-weight: 600;
  padding: 7px 14px; border-radius: 9px; border: 1px solid var(--accent);
  background: var(--accent); color: #fff; cursor: pointer; text-decoration: none;
}
.button.ghost { background: var(--panel); color: var(--ink); border-color: var(--line); font-weight: 500; }
.button.ghost:hover { border-color: var(--accent); }
.button:disabled { opacity: 0.45; cursor: default; }
h2 { font-size: 1.25rem; margin: 36px 0 12px; }
h3 { margin: 0; font-size: 1.05rem; }
.lede { max-width: 760px; margin: 0 0 8px; }
.links a { color: var(--accent); }
.status { color: var(--muted); font-size: 0.92rem; }
.hint { color: var(--muted); font-size: 0.9rem; }
code { font-size: 0.92em; }

.drop {
  display: block;
  padding: 28px 24px;
  border: 2px dashed var(--line);
  border-radius: 14px;
  background: var(--panel);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.drop:hover, .drop.over { border-color: var(--accent); }
.drop .hint { display: block; margin-top: 6px; }

.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(520px, 1fr)); gap: 20px; }
@media (max-width: 600px) { .gallery { grid-template-columns: 1fr; } }
#yours-out .card { margin-top: 16px; }

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.card > header { padding: 14px 16px 10px; }
.about { margin: 2px 0 10px; color: var(--muted); font-size: 0.9rem; }
.controls { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.spacer { flex: 1; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.seg button, .link {
  font: inherit;
  font-size: 0.85rem;
  border: 0;
  background: transparent;
  color: var(--ink);
  padding: 4px 10px;
  cursor: pointer;
}
.seg button.on { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.link { color: var(--accent); border-radius: 6px; }
.link:hover { background: var(--accent-soft); }

.stage { background: #fff; border-top: 1px solid var(--line); min-height: 200px; display: grid; place-items: center; }
.drawing { display: block; width: 100%; border: 0; background: #fff; }
.pending { color: #64748b; font-size: 0.9rem; }
.error { color: var(--error); padding: 16px; font-size: 0.9rem; }
.warn { color: var(--warn); font-size: 0.82rem; margin: 0; padding: 0 16px 10px; }
.warn:empty { display: none; }

.note { font-size: 0.9rem; margin: 8px 0 0; }
.note:empty { display: none; }
h3.sub { margin: 24px 0 8px; }
.search { display: flex; gap: 12px; align-items: center; }
.search input {
  flex: 1;
  font: inherit;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  color: var(--ink);
}
.search input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.parts { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 14px; margin-top: 12px; }
.part {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.stage.small { min-height: 150px; border-top: 0; border-bottom: 1px solid var(--line); padding: 8px; }
.stage.small .drawing { max-height: 220px; object-fit: contain; }
.part .meta { padding: 10px 12px 12px; display: flex; flex-direction: column; gap: 2px; }
.part h4 { margin: 0; font-size: 0.92rem; line-height: 1.3; }
.part .lib { margin: 0; color: var(--muted); font-size: 0.8rem; }
.part .mid { font-size: 0.72rem; color: var(--muted); word-break: break-all; }
.part .warn { padding: 0; }
.part .actions { display: flex; flex-wrap: wrap; gap: 2px; margin-top: 6px; margin-left: -10px; }
.part h4 a { color: var(--ink); text-decoration: none; }
.part h4 a:hover { color: var(--accent); }
a.stage { text-decoration: none; }
a.link { text-decoration: none; display: inline-block; padding: 4px 10px; font-size: 0.85rem; }

/* a part's page */
.detail header { padding: 0; }
.detail .actions { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 0; }
.detail .lede:empty { display: none; }
.views { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 16px; }
.view-card { margin: 0; background: var(--panel); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.view-card figcaption { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 10px 14px; font-weight: 600; }
.view-card .stage { padding: 12px; }
.view-card .drawing { max-height: 420px; }
.files { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 14px; }
.file { margin: 0; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; display: flex; flex-direction: column; }
.file .thumb { background: #fff; height: 140px; display: grid; place-items: center; border-bottom: 1px solid var(--line); padding: 10px; }
.file .thumb img { max-width: 100%; max-height: 120px; }
.file .fzp { font: 600 1.4rem ui-monospace, Menlo, monospace; color: #64748b; }
.file figcaption { padding: 10px 12px 12px; display: flex; flex-direction: column; gap: 2px; font-size: 0.88rem; }
.file code { font-size: 0.72rem; color: var(--muted); word-break: break-all; }
.file .row { display: flex; gap: 2px; margin: 4px 0 0 -10px; }
.two { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 2fr); gap: 24px; }
@media (max-width: 860px) { .two { grid-template-columns: 1fr; } }
.table-wrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font-size: 0.88rem; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
th, td { text-align: left; padding: 6px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; font-size: 0.8rem; }
#props td:first-child { color: var(--muted); white-space: nowrap; }
td { word-break: break-word; }

/* the editor */
body.app { height: 100vh; display: flex; flex-direction: column; overflow: hidden; }
.editor { flex: 1; min-height: 0; display: grid; grid-template-columns: 280px minmax(0, 1fr); }
.side { border-right: 1px solid var(--line); background: var(--panel); padding: 12px; overflow-y: auto; display: flex; flex-direction: column; gap: 8px; }
.side .search input { padding: 8px 12px; }
.picks { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 2px; }
.picks button { width: 100%; text-align: left; font: inherit; background: transparent; color: var(--ink); border: 0; border-radius: 8px; padding: 6px 8px; cursor: pointer; display: flex; flex-direction: column; }
.picks button:hover { background: var(--accent-soft); }
.picks strong { font-size: 0.88rem; font-weight: 600; line-height: 1.3; }
.picks span { font-size: 0.76rem; color: var(--muted); }
.board { min-width: 0; min-height: 0; display: flex; flex-direction: column; overflow-y: auto; }
.toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; padding: 8px 12px; border-bottom: 1px solid var(--line); background: var(--panel); position: sticky; top: 0; z-index: 2; }
.toolbar .button { padding: 5px 11px; font-size: 0.85rem; }
.sep { width: 1px; height: 22px; background: var(--line); margin: 0 4px; }
.swatches { display: inline-flex; gap: 4px; }
.swatch { width: 20px; height: 20px; border-radius: 50%; border: 2px solid var(--line); cursor: pointer; padding: 0; }
.swatch.on { outline: 2px solid var(--accent); outline-offset: 1px; }
.canvas-wrap { position: relative; flex: 0 0 auto; height: calc(100vh - 110px); min-height: 360px; }
#canvas { display: block; width: 100%; height: 100%; background: #f8fafc; touch-action: none; user-select: none; cursor: grab; }
#canvas .part { cursor: move; }
#canvas .outline { fill: none; stroke: transparent; stroke-width: 1; vector-effect: non-scaling-stroke; }
#canvas .part.selected .outline { stroke: #2563eb; stroke-dasharray: 4 3; }
#canvas .part:hover .outline { stroke: #93c5fd; }
#canvas .placeholder { fill: #e2e8f0; stroke: #94a3b8; stroke-dasharray: 3 2; }
#canvas .placeholder.failed { fill: #fee2e2; stroke: #b91c1c; }
#canvas .note { font: 6px system-ui, sans-serif; fill: #334155; }
#canvas .tag { font: 600 6.5px system-ui, sans-serif; fill: #334155; pointer-events: none; }
#canvas .pin { fill: transparent; stroke: rgba(37, 99, 235, 0.3); stroke-width: 0.6; cursor: crosshair; }
#canvas .pin:hover, #canvas.wiring .pin:hover { stroke: #2563eb; stroke-width: 1.2; fill: rgba(37, 99, 235, 0.25); }
#canvas.wiring .pin { stroke: rgba(37, 99, 235, 0.7); }
#canvas .wire { cursor: pointer; }
#canvas .wire polyline { fill: none; stroke-linecap: round; stroke-linejoin: round; }
#canvas .wire .hit { stroke: transparent; stroke-width: 8; }
#canvas .wire .shadow { stroke: rgba(15, 23, 42, 0.35); stroke-width: 3.6; }
#canvas .wire .line { stroke-width: 2; }
#canvas .wire.selected .shadow { stroke: #2563eb; stroke-width: 5; }
#canvas .wire .joint { stroke: rgba(15, 23, 42, 0.45); stroke-width: 0.5; cursor: move; }
#canvas .wire.selected .joint { r: 2.6; fill: #fff; stroke: #2563eb; stroke-width: 1; }
#canvas .wire.selected .joint.selected { fill: #2563eb; }
#canvas .temp { pointer-events: none; }
.empty { position: absolute; inset: 0; margin: auto; height: fit-content; max-width: 420px; text-align: center; color: var(--muted); pointer-events: none; }
.empty a { pointer-events: auto; }
.inspector { position: absolute; top: 12px; right: 12px; width: 240px; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 12px; display: flex; flex-direction: column; gap: 8px; box-shadow: 0 6px 20px rgba(15, 23, 42, 0.08); font-size: 0.88rem; }
.inspector .title { margin: 0; font-weight: 600; }
.inspector label { display: flex; flex-direction: column; gap: 2px; color: var(--muted); font-size: 0.8rem; }
.inspector input { font: inherit; font-size: 0.88rem; padding: 5px 8px; border: 1px solid var(--line); border-radius: 7px; background: var(--bg); color: var(--ink); }
.inspector .row { display: flex; align-items: center; justify-content: space-between; margin: 0 0 0 -10px; }
.inspector .ends { margin: 0; word-break: break-all; }
#out { padding: 0 12px 24px; }
#out .card { margin-top: 16px; }
@media (max-width: 760px) {
  body.app { height: auto; overflow: visible; }
  .editor { grid-template-columns: 1fr; }
  .side { border-right: 0; border-bottom: 1px solid var(--line); max-height: 260px; }
  .canvas-wrap { height: 70vh; }
}
.more {
  display: block;
  margin: 16px auto 0;
  font: inherit;
  padding: 8px 18px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  color: var(--accent);
  cursor: pointer;
}

footer { color: var(--muted); font-size: 0.85rem; padding-top: 32px; padding-bottom: 40px; }