/* Layout: a drafting-table spec sheet. Controls and results run down the left; the sign, drawn to scale with dimension lines, stays in view on the right. */
:root{
  --bg:#F1F2F3;
  --surface:#F8F9FA;
  --field:#FFFFFF;
  --ink:#16212E;
  --muted:#575A5D;
  --line:#D3D5D7;
  --accent:#274E7C;          /* primary blue */
  --accent-ink:#FFFFFF;
  --secondary:#929496;       /* secondary grey */
  --sheet:#FBFBFA;
  --sheet-ink:#15191D;
  --guide:#929496;
  --ok:#2F6B4F;
  --bad:#B3261E;
  --display:"IM Fell English","IM Fell French Canon",Georgia,serif;
  --body:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#10161D;--surface:#18202A;--field:#0F151B;--ink:#E8ECF0;--muted:#A3A6A9;--line:#2D353D;
    --accent:#8FB2DE;--accent-ink:#0C1928;--secondary:#929496;--sheet:#EEEEEC;--sheet-ink:#14181C;--guide:#929496;
    --ok:#7CC3A0;--bad:#F2877F;color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#10161D;--surface:#18202A;--field:#0F151B;--ink:#E8ECF0;--muted:#A3A6A9;--line:#2D353D;
  --accent:#8FB2DE;--accent-ink:#0C1928;--secondary:#929496;--sheet:#EEEEEC;--sheet-ink:#14181C;--guide:#929496;
  --ok:#7CC3A0;--bad:#F2877F;color-scheme:dark;
}
body{
  background:var(--bg);color:var(--ink);
  font-family:var(--body);font-size:15px;line-height:1.5;
  padding-inline:16px;padding-block:20px 48px;
}
*,*::before,*::after{box-sizing:border-box}
.wrap{max-width:1120px;margin:0 auto}
header{margin-bottom:24px}
h1{font-family:var(--display);font-weight:400;color:var(--accent);font-size:clamp(30px,6vw,46px);line-height:1.1;margin:0;text-wrap:balance}
.lede{color:var(--muted);max-width:62ch;margin:8px 0 0}
h2{font-size:12px;font-weight:600;letter-spacing:.09em;text-transform:uppercase;margin:0 0 12px}
h3{font-size:12px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin:18px 0 8px}
.sec{border-top:2px solid var(--accent);padding-top:12px;min-width:0}
.note{color:var(--muted);font-size:13px;margin:0 0 12px;max-width:62ch}

/* page structure: single column on phones, two columns from 900px */
.grid{display:flex;flex-direction:column;gap:28px}
.col-left{display:contents}
.s-inputs{order:1}.s-results{order:2}.preview{order:3}.s-place{order:4}.s-scale{order:5}
@media (min-width:900px){
  .grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(300px,380px);gap:40px;align-items:start}
  .col-left{display:flex;flex-direction:column;gap:28px;min-width:0}
  .preview{position:sticky;top:16px}
}

/* form controls */
.fields{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px}
.f{display:flex;flex-direction:column;gap:4px;min-width:0}
.f.wide{grid-column:1/-1}
label{font-size:13px;font-weight:500}
label output{font-family:var(--mono);font-weight:400;color:var(--muted);margin-left:6px}
input[type=text],input[type=number],select{
  font:inherit;color:var(--ink);background:var(--field);
  border:1px solid var(--line);border-radius:6px;padding:8px 10px;min-height:40px;width:100%;
}
input[type=number]{font-family:var(--mono)}
input[type=range]{width:100%;min-height:28px;accent-color:var(--accent);margin:0}
.check{display:flex;align-items:center;gap:8px;font-weight:400;min-height:32px}
.check input{width:18px;height:18px;accent-color:var(--accent);margin:0}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
button{font:inherit;font-weight:600;background:var(--accent);color:var(--accent-ink);border:0;border-radius:6px;padding:9px 14px;cursor:pointer}
.warn{color:var(--bad);font-size:13px;margin:6px 0 0}

/* results */
.hero{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:10px 16px;margin-bottom:6px}
.big{font-family:var(--mono);font-weight:500;font-size:clamp(44px,10vw,68px);line-height:1;color:var(--accent);font-variant-numeric:tabular-nums}
.big .unit{font-size:.36em;color:var(--muted);margin-left:6px}
.cap{color:var(--muted);font-size:13px;margin:6px 0 0;max-width:34ch}
.pill{display:inline-block;padding:3px 10px;border:1px solid currentColor;border-radius:999px;font-size:12px;font-weight:600}
.pill.ok{color:var(--ok)}
.pill.bad{color:var(--bad)}
.hint{color:var(--muted);font-size:13px;margin:8px 0 12px;max-width:62ch}
.kv{margin:0}
.kv>div{display:flex;justify-content:space-between;align-items:baseline;gap:16px;padding:7px 0;border-bottom:1px solid var(--line)}
.kv dt{color:var(--muted);font-size:13px;min-width:0}
.kv dd{margin:0;font-family:var(--mono);text-align:right;font-variant-numeric:tabular-nums;min-width:0}
.kv dd small{display:block;color:var(--muted);font-size:11px}
.row{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-top:14px}
#copied,#pdfMsg{color:var(--muted);font-size:13px}
button:disabled{opacity:.5;cursor:not-allowed}
.rg{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px;margin-top:12px}
.rc{border:1px solid var(--line);border-radius:6px;padding:10px;display:flex;flex-direction:column;gap:8px;min-width:0;background:var(--surface)}
.rc-top{display:flex;align-items:center;gap:10px;min-width:0}
.rc-glyph{font-size:34px;line-height:1;width:36px;text-align:center;display:inline-block;flex:none}
.rc label{font-size:12px;color:var(--muted)}
.mini{background:transparent;color:var(--accent);border:1px solid var(--secondary);padding:5px 8px;font-size:12px;font-weight:600}


/* table */
.scroll{overflow-x:auto}
table{border-collapse:collapse;width:100%;min-width:420px;font-variant-numeric:tabular-nums}
th{font-size:11px;font-weight:600;letter-spacing:.07em;text-transform:uppercase;color:var(--muted);text-align:right;padding:6px 8px 6px 0}
th:first-child,td:first-child{text-align:left}
td{font-family:var(--mono);text-align:right;padding:7px 8px 7px 0;border-top:1px solid var(--line);vertical-align:top}
td:first-child{font-family:var(--body);color:var(--muted)}
td .sub{display:block;color:var(--muted);font-size:11px}
.gl{font-size:22px;line-height:1;color:var(--ink);font-family:var(--display)}

/* preview */
.board-wrap{display:flex;justify-content:center}
.board-wrap svg{display:block;height:min(72vh,760px);width:auto;max-width:100%}
.sheet{fill:var(--sheet);stroke:var(--secondary);stroke-width:.08}
.glyph{fill:var(--sheet-ink);text-rendering:geometricPrecision}
.guide{fill:none;stroke:var(--secondary);stroke-width:.06;stroke-dasharray:.4 .3}
.box{fill:none;stroke:var(--guide);stroke-width:.04}
.dim{stroke:var(--accent);stroke-width:.07;fill:none}
.dimtext{fill:var(--accent);font-family:var(--mono);font-size:1px;font-weight:500}

/* settings */
.s-settings{margin-bottom:28px}
.seg{align-self:flex-start;display:inline-flex;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:var(--field);max-width:100%}
.seg label{position:relative;display:flex;align-items:center;gap:8px;padding:9px 16px;min-height:40px;cursor:pointer;font-weight:500}
.seg label+label{border-left:1px solid var(--line)}
.seg input{position:absolute;inset:0;width:100%;height:100%;opacity:0;margin:0;cursor:pointer}
.seg label:has(input:checked){background:var(--accent);color:var(--accent-ink)}
.seg label:has(input:focus-visible){outline:2px solid var(--accent);outline-offset:-3px}
.seg svg{flex:none}
.lbl{font-size:13px;font-weight:500}
.addrow{display:flex;flex-wrap:wrap;gap:8px}
.addrow input{flex:1 1 260px;min-width:0}
.msg{font-size:13px;color:var(--muted);margin:6px 0 0;max-width:70ch;overflow-wrap:anywhere}
.msg.bad{color:var(--bad)}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:8px}
.chip{display:inline-flex;align-items:center;gap:4px;border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:2px 4px 2px 12px;font-size:13px}
.chip button{background:transparent;color:var(--muted);border:0;padding:4px 8px;font-size:12px;font-weight:600}
.board-wrap.horizontal svg{width:100%;height:auto}
@media (min-width:900px){
  body.horiz .grid{grid-template-columns:minmax(0,1fr)}
  body.horiz .preview{order:-1;top:0;z-index:2;background:var(--bg);padding-bottom:8px}
}