/* Layout: workbench — square drawing board on the left, tool panel on the right; stacks on phones */
:root{
  --bg:#e9eee9; --board:#f6f8f5; --ink:#1f2a24; --muted:#5d6b63; --line:#c9d3cc;
  --wood:#e2b97a; --wood-edge:#a87b3e; --groove:#7a5226;
  --signal:#c8372d; --rail:#24496b; --ok:#2f7a4b; --warn:#b4541a;
  --f-display:"Bricolage Grotesque",ui-sans-serif,system-ui,sans-serif;
  --f-body:"Figtree",ui-sans-serif,system-ui,sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#141a17; --board:#1c241f; --ink:#e6ece7; --muted:#9aa9a0; --line:#34413a;
  --wood:#d7aa66; --wood-edge:#f0cf98; --groove:#5a3a17;
  --signal:#ec5a4c; --rail:#7fb2e0; --ok:#5fc187; --warn:#f0954f; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#141a17; --board:#1c241f; --ink:#e6ece7; --muted:#9aa9a0; --line:#34413a;
  --wood:#d7aa66; --wood-edge:#f0cf98; --groove:#5a3a17;
  --signal:#ec5a4c; --rail:#7fb2e0; --ok:#5fc187; --warn:#f0954f; color-scheme:dark}
html,body{background:var(--bg);color:var(--ink)}
body{font-family:var(--f-body);font-size:15px;line-height:1.5;
  padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px));padding-block:20px 40px}
.wrap{max-width:1080px;margin:0 auto;display:flex;flex-direction:column;gap:18px}
header h1{font-family:var(--f-display);font-weight:800;font-size:clamp(26px,4.4vw,38px);line-height:1.05;margin:0;letter-spacing:-.01em;text-wrap:balance}
header p{margin:6px 0 0;color:var(--muted);max-width:62ch}
.app{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:18px;align-items:start}
@media (max-width:820px){.app{grid-template-columns:minmax(0,1fr)}}
.board{background:var(--board);border:1px solid var(--line);border-radius:14px;padding:12px;display:flex;flex-direction:column;gap:10px;min-width:0}
canvas{width:100%;max-width:100%;aspect-ratio:1/1;display:block;touch-action:manipulation;cursor:pointer;border-radius:8px}
.dim{font-family:var(--f-mono);font-size:15px;font-variant-numeric:tabular-nums;display:flex;flex-wrap:wrap;gap:4px 18px}
.dim b{font-family:var(--f-display);font-weight:800;font-size:22px;letter-spacing:-.01em}
.dim span{color:var(--muted)}
.status{font-size:14px;min-height:1.5em;color:var(--muted)}
.status.err{color:var(--warn);font-weight:600}
.legend{display:flex;flex-wrap:wrap;gap:6px 16px;font-size:13px;color:var(--muted)}
.legend span{display:inline-flex;align-items:center;gap:6px}
.dot{width:12px;height:12px;border-radius:50%;display:inline-block;border:2px solid var(--muted)}
.dot.m{background:var(--signal);border-color:var(--signal)}
.dot.f{background:var(--board);border-color:var(--rail);border-width:3px}
.panel{display:flex;flex-direction:column;gap:14px;min-width:0}
section{border-top:2px solid var(--ink);padding-top:8px;display:flex;flex-direction:column;gap:8px}
h2{font-family:var(--f-display);font-weight:600;font-size:13px;letter-spacing:.09em;text-transform:uppercase;margin:0;display:flex;justify-content:space-between;align-items:baseline}
h2 small{font-family:var(--f-mono);font-weight:400;letter-spacing:0;text-transform:none;color:var(--muted)}
.empty{color:var(--muted);font-size:14px;margin:0}
ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:6px}
li.route{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:10px;align-items:center;padding:6px 8px;border:1px solid var(--line);border-radius:8px;background:var(--board)}
.pair{font-family:var(--f-mono);font-weight:600;font-size:14px;white-space:nowrap}
.meta{font-size:13px;color:var(--muted);min-width:0}
.bad{color:var(--warn);font-weight:600}
button{font:inherit;color:inherit;cursor:pointer}
button:focus-visible,input:focus-visible,summary:focus-visible{outline:2px solid var(--rail);outline-offset:2px}
.x{background:none;border:1px solid var(--line);border-radius:6px;width:30px;height:30px;line-height:1;font-size:16px;color:var(--muted)}
.x:hover{color:var(--signal);border-color:var(--signal)}
li.port{display:flex;align-items:center;justify-content:space-between;gap:10px}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.seg button{background:none;border:0;padding:5px 10px;font-size:13px;color:var(--muted)}
.seg button[aria-pressed="true"].m{background:var(--signal);color:#fff}
.seg button[aria-pressed="true"].f{background:var(--rail);color:var(--board)}
.seg button[aria-pressed="true"].n{background:var(--ink);color:var(--board)}
header .top{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}
.lang button{font-family:var(--f-mono);font-weight:600;padding:6px 12px}
.lang{font:inherit;font-size:13px;padding:5px 8px;border:1px solid var(--line);border-radius:8px;background:var(--board);color:var(--ink)}
.npick{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;font-size:13px;color:var(--muted)}
.nlab{flex-direction:row;align-items:baseline;gap:6px;font-size:13px;color:var(--muted)}
.nlab output{font-family:var(--f-display);font-weight:800;font-size:22px;color:var(--ink);min-width:1.5ch}
.nlab span{font-family:var(--f-mono)}
.stepper{display:flex;align-items:center;gap:8px;flex:1 1 200px;max-width:320px}
.stepper input{flex:1;min-width:0;accent-color:var(--signal)}
.stepper button{width:34px;height:34px;border:1px solid var(--line);border-radius:8px;background:var(--board);font-size:18px;line-height:1}
.size{display:flex;flex-wrap:wrap;gap:8px 12px}
.view{display:flex;flex-wrap:wrap;gap:8px 12px;align-items:center}
.calib{display:flex;flex-direction:column;gap:8px;font-size:13px;color:var(--muted)}
.calib[hidden]{display:none}
.calib p{margin:0;max-width:62ch}
.calib input{accent-color:var(--signal)}
.card{border:2px dashed var(--ink);box-sizing:border-box;flex:none}
.cvwrap{max-width:100%;overflow:auto;border-radius:8px}
.cvwrap[hidden],.v3d[hidden],#scale[hidden]{display:none}
.v3d{width:100%;aspect-ratio:1/1;border-radius:8px;overflow:hidden;cursor:grab;touch-action:none}
.v3d canvas{display:block;width:100%!important;height:100%!important;aspect-ratio:auto}
.cvwrap.real{max-height:80vh}
.size label{flex:0 1 150px;position:relative}
.tip{position:absolute;top:100%;left:0;margin-top:4px;z-index:5;background:var(--board);color:var(--signal);border:1px solid var(--signal);font-size:14px;font-weight:800;padding:4px 8px;border-radius:6px;white-space:nowrap}
details summary{cursor:pointer;font-family:var(--f-display);font-weight:600;font-size:13px;letter-spacing:.09em;text-transform:uppercase;list-style:none}
details summary::-webkit-details-marker{display:none}
details summary::after{content:" +";color:var(--muted)}
details[open] summary::after{content:" −"}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:8px 10px;margin-top:10px}
label{display:flex;flex-direction:column;gap:2px;font-size:12px;color:var(--muted)}
input[type=number]{font-family:var(--f-mono);font-size:14px;padding:6px 8px;border:1px solid var(--line);border-radius:6px;background:var(--board);color:var(--ink);width:100%;box-sizing:border-box}
.note{font-size:12.5px;color:var(--muted);margin:8px 0 0}
.note a{color:var(--rail)}
.stats{font-family:var(--f-mono);font-size:13px;display:grid;grid-template-columns:auto 1fr;gap:2px 12px;font-variant-numeric:tabular-nums}
.stats dt{color:var(--muted)} .stats dd{margin:0}
.go{background:var(--ink);color:var(--bg);border:0;border-radius:10px;padding:12px 14px;font-weight:600;font-size:15px}
.go:disabled{opacity:.45;cursor:not-allowed}
.small{font-size:13px;color:var(--muted);margin:0}
.ghost{background:none;border:1px solid var(--line);border-radius:8px;padding:6px 10px;font-size:13px;color:var(--muted);align-self:flex-start}
.about{border-top:2px solid var(--ink);padding-top:8px;display:flex;flex-direction:column;gap:6px;max-width:72ch;color:var(--muted);font-size:14px}
.about h2{color:var(--ink);margin-top:6px}
.about p{margin:0}
.about b{color:var(--ink)}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}