/* ENGINEER'S COMPUTATION PAD — shared design system (matches lag screw & through-bolt tools) */
: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;
  --conc:#E2E0D8; --conc2:#CFCCC0;
  --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}
.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}
@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}
}