/* ============================================================
   ENGINEER'S COMPUTATION PAD — shared design system
   (matches lag-screw-design-tool.html)
   ============================================================ */
:root{
  --pad:#F0EEE2; --grid:#DEDBCB; --sheet:#FCFBF4; --sheetline:#E9E6D8;
  --ink:#16202C; --ink-soft:#4A5868; --steel:#2E64A6; --steel-soft:#DCE6F2;
  --ok:#1B7F4D; --fail:#B3362B; --warn:#A36A1B;
  --wood-side:#E4D6BC; --wood-main:#D8C5A3; --wood-grain:#B9A27D;
  --mono:'IBM Plex Mono',ui-monospace,Consolas,monospace;
  --disp:'IBM Plex Sans',system-ui,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{font-size:15px}
.topbar h1,.titleblock .tb-l h2{font-family:'Archivo',system-ui,sans-serif;letter-spacing:.04em}
body{
  font-family:var(--disp); color:var(--ink); background:var(--pad);
  background-image:
    repeating-linear-gradient(0deg, transparent 0 23px, var(--grid) 23px 24px),
    repeating-linear-gradient(90deg, transparent 0 23px, var(--grid) 23px 24px);
  min-height:100vh;
}
a{color:var(--link,#4E7A63)}
.topbar{
  background:var(--ink); color:#F6F8F9; padding:.7rem 1.4rem;
  display:flex; align-items:baseline; gap:1rem; flex-wrap:wrap;
}
.topbar h1{font-size:1.05rem; font-weight:700; letter-spacing:.06em; text-transform:uppercase}
.topbar .ref{font-family:var(--mono); font-size:.72rem; opacity:.75}
.topbar .printbtn{
  margin-left:auto; font-family:var(--disp); font-weight:600; font-size:.8rem;
  letter-spacing:.05em; text-transform:uppercase; cursor:pointer;
  background:var(--safety); color:#fff; border:1px solid var(--safety-dark); padding:.5rem 1.1rem; border-radius:3px;
}
.topbar .printbtn:hover{filter:brightness(1.08)}
.topbar .printbtn:focus-visible{outline:2px solid #fff; outline-offset:2px}
.wrap{display:grid; grid-template-columns:minmax(300px,360px) 1fr; gap:1.4rem; padding:1.4rem; max-width:1480px; margin:0 auto}
@media (max-width:980px){ .wrap{grid-template-columns:1fr} }
.controls{display:flex; flex-direction:column; gap:1rem}
fieldset{
  border:1px solid var(--ink-soft); border-radius:4px; background:var(--sheet);
  padding:.85rem .9rem .95rem; box-shadow:2px 2px 0 rgba(30,43,36,.08);
}
legend{font-weight:700; font-size:.72rem; letter-spacing:.12em; text-transform:uppercase; padding:0 .45rem}
.row{display:grid; grid-template-columns:1fr 1fr; gap:.55rem .7rem; margin-bottom:.55rem}
.row.one{grid-template-columns:1fr}
label.fld{display:block; font-size:.72rem; color:var(--ink-soft); font-weight:600}
label.fld input,label.fld select{margin-top:.18rem}
label.fld .u{font-weight:400}
input[type=number],input[type=text],select{
  font-family:var(--mono); font-size:.85rem; color:var(--ink);
  border:1px solid #9AA7B4; border-radius:3px; padding:.34rem .45rem; background:#fff; width:100%;
}
input:focus-visible,select:focus-visible{outline:2px solid var(--steel); outline-offset:1px}
label.chk{display:block; font-size:.78rem; padding:.18rem 0; cursor:pointer}
label.chk input{vertical-align:-2px; margin-right:.5rem}
label.chk input{accent-color:var(--steel); width:15px; height:15px}
.hint{font-size:.68rem; color:var(--ink-soft); line-height:1.45; margin-top:.3rem}
.sheet{
  background:var(--sheet); border:1px solid var(--ink); border-radius:2px;
  box-shadow:4px 4px 0 rgba(30,43,36,.12); overflow:hidden;
}
.titleblock{display:grid; grid-template-columns:1fr auto; border-bottom:2px solid var(--ink); background:var(--sheet)}
.titleblock .tb-l{padding:.9rem 1.2rem .7rem}
.titleblock .tb-l h2{font-size:1.25rem; font-weight:700}
.titleblock .tb-l .sub{font-family:var(--mono); font-size:.7rem; color:var(--ink-soft); margin-top:.15rem}
.tb-r{display:grid; grid-template-columns:auto auto; border-left:1px solid var(--ink); font-size:.68rem}
.tb-r div{padding:.32rem .8rem; border-bottom:1px solid var(--sheetline)}
.tb-r div:nth-child(odd){font-weight:700; text-transform:uppercase; letter-spacing:.08em; color:var(--ink-soft); border-right:1px solid var(--sheetline)}
.tb-r div:nth-child(even){font-family:var(--mono)}
.sheet-body{padding:1.1rem 1.4rem 1.6rem}
.stamprow{display:flex; gap:.9rem; flex-wrap:wrap; margin:.4rem 0 1rem}
.stamp{
  font-family:var(--mono); font-weight:600; font-size:.78rem; letter-spacing:.14em;
  border:2.5px solid; border-radius:5px; padding:.4rem .9rem; transform:rotate(-1.5deg);
  text-transform:uppercase;
}
.stamp.ok{color:var(--ok); border-color:var(--ok)}
.stamp.fail{color:var(--fail); border-color:var(--fail); transform:rotate(1.4deg)}
.stamp.warn{color:var(--warn); border-color:var(--warn)}
.stamp small{display:block; font-size:.58rem; letter-spacing:.06em; opacity:.8}
.calcsec{margin:1.35rem 0 0}
.calcsec h3{
  font-size:.78rem; font-weight:700; letter-spacing:.12em; text-transform:uppercase;
  border-bottom:1.5px solid var(--ink); padding-bottom:.25rem; margin-bottom:.6rem;
}
.calcsec h3 .sec-ref{font-family:var(--mono); font-weight:400; font-size:.62rem; color:var(--ink-soft); letter-spacing:.03em; text-transform:none; float:right}
table.calc{width:100%; border-collapse:collapse; font-size:.78rem}
table.calc th{
  text-align:left; font-size:.62rem; letter-spacing:.1em; text-transform:uppercase;
  color:var(--ink-soft); font-weight:700; padding:.3rem .5rem; border-bottom:1px solid var(--ink-soft);
}
table.calc td{padding:.32rem .5rem; border-bottom:1px solid var(--sheetline); vertical-align:top}
table.calc td.num, table.calc td.eq{font-family:var(--mono)}
table.calc td.num{text-align:right; white-space:nowrap}
table.calc td.eq{color:var(--ink-soft); font-size:.72rem}
table.calc tr.govern td{background:var(--steel-soft); font-weight:600}
.tag{font-family:var(--mono); font-size:.62rem; padding:.05rem .4rem; border-radius:3px; border:1px solid; white-space:nowrap}
.tag.ok{color:var(--ok); border-color:var(--ok)}
.tag.fail{color:var(--fail); border-color:var(--fail)}
.tag.warn{color:var(--warn); border-color:var(--warn)}
.kv{display:grid; grid-template-columns:repeat(auto-fit,minmax(180px,1fr)); gap:.5rem .9rem; font-size:.78rem}
.kv .k{color:var(--ink-soft); font-size:.66rem; text-transform:uppercase; letter-spacing:.08em; font-weight:700}
.kv .v{font-family:var(--mono); font-size:.92rem}
.kv .cell{padding:.4rem .55rem; border:1px solid var(--sheetline); border-radius:3px; background:#fff}
.bignum{display:grid; grid-template-columns:repeat(auto-fit,minmax(190px,1fr)); gap:.8rem; margin:.3rem 0 .2rem}
.bignum .card{border:1.5px solid var(--ink); border-radius:4px; padding:.6rem .8rem; background:#fff}
.bignum .card .lbl{font-size:.62rem; text-transform:uppercase; letter-spacing:.1em; font-weight:700; color:var(--ink-soft)}
.bignum .card .val{font-family:var(--mono); font-size:1.5rem; font-weight:600; margin-top:.1rem}
.bignum .card .un{font-family:var(--mono); font-size:.7rem; color:var(--ink-soft)}
.bignum .card.govern{border-color:var(--steel); background:var(--steel-soft)}
.note{font-size:.7rem; line-height:1.55; color:var(--ink-soft)}
.note ol{margin-left:1.1rem}
.note li{margin:.2rem 0}
.flag-fail{color:var(--fail); font-weight:600}
.flag-warn{color:var(--warn); font-weight:600}
#diagram{width:100%; height:auto; display:block; background:#fff; border:1px solid var(--sheetline); border-radius:3px}
/* connection-material mode toggle: show wood-only or steel-only inputs */
#controls.mode-steel .wood-only{display:none !important}
#controls:not(.mode-steel) .steel-only{display:none !important}
@page{size:letter; margin:.95in .55in .95in}
@media print{
  body{background:#fff !important; background-image:none !important}
  .topbar,.controls{display:none !important}
  .wrap{display:block; padding:0; max-width:none}
  .sheet{box-shadow:none; border:none; background-image:none}
  /* title block stays whole and pulls the first section with it */
  .titleblock{border:1px solid var(--ink); border-radius:2px; break-inside:avoid; break-after:avoid}
  .sheet-body{padding:.45rem 0 0}
  /* small blocks never split */
  .stamprow{break-inside:avoid; margin:.3rem 0 .8rem}
  #diagram{break-inside:avoid; max-height:4.4in}
  .kv,.bignum{break-inside:avoid}
  /* sections may flow across pages; their heading never gets orphaned */
  .calcsec{break-inside:auto; margin-top:1rem}
  .calcsec h3{break-after:avoid}
  /* long tables span pages cleanly: header repeats, rows stay intact */
  table.calc{break-inside:auto}
  table.calc thead{display:table-header-group}
  table.calc tbody tr{break-inside:avoid}
  .calcsec.notes{break-inside:auto}
  .note li{break-inside:avoid}
  .seal-block{break-inside:avoid}
  :root{--sheet:#fff}
}