:root {
  --paper: #eceeea;
  --sheet: #f7f7f4;
  --ink: #1c2430;
  --ink-soft: #4b5563;
  --rule: #c9cdc9;
  --dim: #3b4a63;
  --wall: #2b2b2b;
  --room: #ddd8ce;
  --sofa: #e6dccb;
  --plank: rgba(90, 80, 68, 0.28);
  --ctx: #b7bcc4;
  --winfill: #ffffff;
  --accent: #2f5da8;
  --accent-ink: #ffffff;
  --cross: rgba(47, 93, 168, 0.55);
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #15181d;
    --sheet: #1d2127;
    --ink: #e6e8ea;
    --ink-soft: #a3abb8;
    --rule: #343a44;
    --dim: #9fb0d0;
    --wall: #d9dce1;
    --room: #2a2f37;
    --sofa: #8c8170;
    --plank: rgba(200, 205, 215, 0.22);
    --ctx: #3a414d;
    --winfill: #1d2127;
    --accent: #7ea3e6;
    --accent-ink: #0f1420;
    --cross: rgba(126, 163, 230, 0.6);
  }
}
:root[data-theme="dark"] {
  --paper: #15181d; --sheet: #1d2127; --ink: #e6e8ea; --ink-soft: #a3abb8; --rule: #343a44;
  --dim: #9fb0d0; --wall: #d9dce1; --room: #2a2f37; --sofa: #8c8170; --plank: rgba(200, 205, 215, 0.22); --ctx: #3a414d; --winfill: #1d2127;
  --accent: #7ea3e6; --accent-ink: #0f1420; --cross: rgba(126, 163, 230, 0.6);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 14px;
  line-height: 1.45;
  font-variant-numeric: tabular-nums;
  display: grid;
  grid-template-rows: auto 1fr;
  min-height: 100dvh;
}

header {
  display: flex; align-items: baseline; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  padding: 14px 16px 10px;
  border-bottom: 1px solid var(--rule);
}
header h1 { font-size: 17px; font-weight: 600; margin: 0; letter-spacing: 0.01em; }
header h1 small { font-weight: 400; color: var(--ink-soft); margin-left: 10px; }
header .meta { color: var(--ink-soft); }

/* Segmented control */
.seg { display: inline-flex; border: 1px solid var(--ink); border-radius: 4px; overflow: hidden; }
.seg button {
  appearance: none; border: 0; background: transparent; color: var(--ink);
  font: inherit; padding: 5px 11px; cursor: pointer; line-height: 1.2;
}
.seg button + button { border-left: 1px solid var(--ink); }
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.seg button:focus-visible, .btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn {
  appearance: none; border: 1px solid var(--ink); border-radius: 4px; background: transparent; color: var(--ink);
  font: inherit; padding: 5px 11px; cursor: pointer; line-height: 1.2;
}
.btn:hover, .seg button:hover:not([aria-pressed="true"]) { background: color-mix(in srgb, var(--ink) 10%, transparent); }
label.chk { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; }
label.chk input { accent-color: var(--accent); margin: 0; }

main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 12px;
  padding: 12px 16px;
  min-height: 0;
}
body[data-view="plan"] main { grid-template-columns: 1fr; }
body[data-view="plan"] #pane-3d { display: none; }
body[data-view="3d"] main { grid-template-columns: 1fr; }
body[data-view="3d"] #pane-plan { display: none; }

.pane {
  background: var(--sheet);
  border: 1px solid var(--rule);
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 0;
  position: relative;
}
.pane-head {
  display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap;
  padding: 8px 12px; border-bottom: 1px solid var(--rule);
}
.pane-head h2 { margin: 0; font-size: 14px; font-weight: 600; }
.pane-head .hint { color: var(--ink-soft); }
.pane-body { position: relative; min-height: 0; overflow: hidden; }
.pane-foot { padding: 6px 12px; border-top: 1px solid var(--rule); color: var(--ink-soft); display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }

#plan { height: 100%; display: grid; place-items: center; padding: 8px; }
#plan svg.plan { width: 100%; height: 100%; display: block; }

#stage { position: absolute; inset: 0; }
#stage canvas { display: block; width: 100% !important; height: 100% !important; touch-action: none; }

/* Plan drawing styles (SVG classes) */
svg.plan { font-family: inherit; }
svg.plan .wall { fill: var(--wall); }
svg.plan .ctx { fill: var(--ctx); }
svg.plan .room { fill: var(--room); }
svg.plan .planks { fill: url(#planks); }
svg.plan #planks line { stroke: var(--plank); stroke-width: 6; }
svg.plan .dim line { stroke: var(--dim); stroke-width: 10; stroke-linecap: round; }
svg.plan .dim .tick { stroke-width: 14; }
svg.plan .dim text { fill: var(--dim); }
svg.plan .ext { stroke: var(--dim); stroke-width: 6; stroke-dasharray: 40 40; opacity: 0.6; }
svg.plan .open { stroke: var(--ink); stroke-width: 10; stroke-dasharray: 60 50; fill: none; }
svg.plan .door { stroke: var(--ink); stroke-width: 16; fill: none; }
svg.plan .arc { stroke: var(--ink); stroke-width: 8; fill: none; stroke-dasharray: 30 30; }
svg.plan .win { stroke: var(--ink); stroke-width: 10; fill: none; }
svg.plan .winfill { fill: var(--winfill); }
svg.plan .lbl { fill: var(--ink); }
svg.plan .sub { fill: var(--ink-soft); }
svg.plan .it { font-style: italic; }
body[data-cover="grey"] { --sofa: #9b9894; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) body[data-cover="grey"] { --sofa: #5e5c59; } }
:root[data-theme="dark"] body[data-cover="grey"] { --sofa: #5e5c59; }
body[data-cover="brown"] { --sofa: #8a7c68; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) body[data-cover="brown"] { --sofa: #4a4034; } }
:root[data-theme="dark"] body[data-cover="brown"] { --sofa: #4a4034; }
body[data-cover="blue"] { --sofa: #5c6b7b; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) body[data-cover="blue"] { --sofa: #2f3a46; } }
:root[data-theme="dark"] body[data-cover="blue"] { --sofa: #2f3a46; }
body[data-cover="red"] { --sofa: #ad6a5c; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) body[data-cover="red"] { --sofa: #6b322b; } }
:root[data-theme="dark"] body[data-cover="red"] { --sofa: #6b322b; }
svg.plan .piece { cursor: grab; outline: none; }
svg.plan .piece.dragging { cursor: grabbing; }
svg.plan .piece-body { fill: var(--sofa); stroke: var(--ink); stroke-width: 10; stroke-linejoin: round; }
svg.plan .piece-back { stroke: var(--ink); stroke-width: 8; }
svg.plan .piece-seam { stroke: var(--ink); stroke-width: 5; stroke-dasharray: 30 25; opacity: 0.7; }
svg.plan .piece:focus-visible .piece-body, svg.plan .piece.dragging .piece-body { stroke: var(--accent); stroke-width: 16; }
svg.plan .measure { pointer-events: none; }
svg.plan .measure line { stroke: var(--accent); stroke-width: 12; stroke-linecap: round; }
svg.plan .measure circle { fill: var(--sheet); stroke: var(--accent); stroke-width: 12; }
svg.plan .measure text { font-size: 105px; font-weight: 600; fill: var(--accent); paint-order: stroke; stroke: var(--sheet); stroke-width: 40; stroke-linejoin: round; }
svg.plan .cross line { stroke: var(--cross); stroke-width: 8; stroke-dasharray: 20 20; pointer-events: none; }


@media (max-width: 900px) {
  body { overflow-x: hidden; }
  main { grid-template-columns: 1fr; }
  .pane { height: 78vh; }
  body[data-view="both"] .pane { height: 72vh; }
  header { padding: 12px 16px 8px; }
  header h1 small { display: block; margin: 2px 0 0; }
  .pane-head .hint { flex-basis: 100%; }
  .pane-foot { padding: 6px 12px; gap: 8px; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}