/* The beam family's page styles: beam-calculator, wood-beam, steel-beam, wood-joist and
   concrete-beam all link this file after /css/theme.css and /css/site.css. Page-only rules stay
   in that page's own <style>. */
 /* Palette inherited from structuralclaw.com (web/index.html). Owner 2026-09-29: the beam
    drawing and the diagrams follow the page's light or dark mode instead of sitting in a
    dark panel on a light page; every colour below is a token, redefined for dark. */
 :root{
   --good:#0f766e;--bad:#c0392b;
   --head:#0e1720;--card:#fff;--field:#fff;--soft:#eef2f7;
   --panel:#f3f6fa;--panel2:#ffffff;--panel-line:#dfe6ee;
   --dg-text:#0e1720;--dg-muted:#5c6b78;--dg-faint:#b6c2cd;--dg-support:#334155;
   --btn:#eef0fe;--btn-ink:#3730a3;--btn-line:#a5a1f5;
   --warn-bg:#fffbeb;--warn-line:#f0d9a0;
 }
 @media (prefers-color-scheme:dark){
  :root{
   --ink:#e6edf3;--paper:#0b1117;--line:#26364a;--muted:#93a4b4;--steel:#cbd5e1;
   --card:#111a24;--field:#0b1117;--soft:#16212d;
   --panel:#0e1720;--panel2:#16212d;--panel-line:#26364a;
   --dg-text:#e6edf3;--dg-muted:#93a4b4;--dg-faint:#4a5a68;--dg-support:#cbd5e1;
   --btn:#1e1b4b;--btn-ink:#c7d2fe;--btn-line:#4f46e5;
   --warn-bg:#2a2210;--warn-line:#6b5a22;
  }
 }
 *{box-sizing:border-box}
 body{margin:0;font-family:Segoe UI,system-ui,sans-serif;color:var(--ink);background:var(--paper);line-height:1.5}
 a{color:var(--lrfd)}
 @media (prefers-color-scheme:dark){a{color:#a5b4fc}}
 header{background:var(--head);color:#fff;padding:1.5rem 1.4rem 1.3rem}
 header .wrap{max-width:1180px;margin:0 auto}
 header .up{font-size:.78rem;letter-spacing:.05em;text-transform:uppercase;color:#93a4b4}
 header .up a{color:#93a4b4;text-decoration:none}header .up a:hover{color:#fff}
 header h1{font-size:1.6rem;margin:.5rem 0 .3rem}
 header p{margin:0;color:#cfd6dd;font-size:.95rem;max-width:52em}

 .banner{background:var(--card);border-bottom:1px solid var(--line);padding:.6rem 1.4rem;font-size:.88rem}
 .banner .wrap{max-width:1180px;margin:0 auto;display:flex;gap:.8rem;align-items:center;flex-wrap:wrap}
 .banner b{color:var(--steel)}
 .banner a.cta{background:var(--lrfd);color:#fff;text-decoration:none;padding:.32rem .85rem;
   border-radius:6px;font-weight:600;font-size:.85rem;margin-left:auto}

 main{max-width:1180px;margin:0 auto;padding:1.2rem 1.4rem 2rem}
 .status{border-radius:8px;padding:.55rem .8rem;font-size:.87rem;margin-bottom:1rem;
   background:var(--soft);border:1px solid var(--line);color:var(--muted)}
 .status.ok{background:rgba(13,148,136,.09);border-color:rgba(13,148,136,.35);color:var(--good)}
 .status.err{background:rgba(192,57,43,.08);border-color:rgba(192,57,43,.35);color:var(--bad)}

 .cols{display:grid;grid-template-columns:minmax(300px,360px) 1fr;gap:1.2rem;align-items:start}
 @media(max-width:900px){.cols{grid-template-columns:minmax(0,1fr)}}
 .cols>*,.row>*,.row3>*{min-width:0}
 input,select{max-width:100%}

 .card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:1rem 1.1rem;margin-bottom:1.1rem}
 .card h2,.diagrams h2{margin:0 0 .7rem;font-size:.95rem;text-transform:uppercase;letter-spacing:.05em;
   color:var(--steel);border-bottom:1px solid var(--line);padding-bottom:.4rem}
 label{display:block;margin:.5rem 0 .12rem;font-size:.78rem;color:var(--muted)}
 input,select{width:100%;padding:.4rem .55rem;border:1px solid var(--line);border-radius:6px;
   background:var(--field);color:var(--ink);font:inherit;font-size:.9rem}
 input:focus,select:focus{outline:2px solid var(--lrfd);outline-offset:1px}
 .row{display:grid;grid-template-columns:1fr 1fr;gap:.6rem}
 /* full-width input cards: fields flow across the page, hints take a whole line */
 .fields{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,210px));gap:.1rem .9rem;align-items:end;justify-content:start}
 .fields[hidden]{display:none}
 .fields .f2{grid-column:span 2}
 .fields .wide{grid-column:1/-1}
 .fields button{margin-top:.5rem}
 .fields .pair{display:flex;gap:.6rem}
 @media(max-width:560px){.fields .f2{grid-column:auto}}
 .loadrow{display:grid;grid-template-columns:7.5rem 6.5rem repeat(4,6rem) 1.6rem;gap:.35rem;align-items:end;margin-top:.35rem;justify-content:start}
 #loads.onecase .loadrow{grid-template-columns:6.5rem repeat(4,6rem) 1.6rem}
 #loads.onecase .loadrow>.lc{display:none}
 .loadfoot{display:flex;flex-wrap:wrap;gap:.6rem 1rem;align-items:end;margin-top:.6rem}
 /* the concrete section, drawn beside its inputs (owner 2026-10-02) */
 .cwrap{display:flex;flex-wrap:wrap;gap:.4rem 1.4rem;align-items:flex-start}
 .cwrap>.fields{flex:1 1 440px}
 .csec{flex:0 0 330px;margin:.4rem 0 0;background:var(--card);border:1px solid var(--line);border-radius:8px;padding:.4rem}
 .csec svg{display:block;width:100%;height:auto}
 .csec figcaption{font-size:.72rem;color:var(--muted);margin-top:.2rem}
 #grp-conc[hidden]+.csec{display:none}
 .loadfoot .f{width:7.5rem}
 .loadfoot button{margin:0;width:auto;padding-left:1.4rem;padding-right:1.4rem}
 .loadfoot+.hint{max-width:80ch}
 .loadrow label{display:block;font-size:.68rem;color:var(--muted);margin-bottom:.1rem}
 .loadrow input,.loadrow select{width:100%;box-sizing:border-box}
 .loadrow .rm{background:transparent;border:0;color:var(--muted);font-size:1.1rem;cursor:pointer;padding:.2rem 0;line-height:1;margin:0;width:auto}
 .loadrow .rm:hover{color:var(--bad)}
 .loadrow .off{visibility:hidden}
 .loadrow[hidden]{display:none}
 .row3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:.6rem}
 button{margin-top:.9rem;width:100%;padding:.6rem;border:0;border-radius:8px;background:var(--lrfd);
   color:#fff;font:inherit;font-weight:600;cursor:pointer;box-shadow:0 1px 2px rgba(15,23,42,.18)}
 button:hover{filter:brightness(1.1)}
 button:focus-visible{outline:2px solid var(--lrfd);outline-offset:2px}
 button:disabled{opacity:.45;cursor:not-allowed;box-shadow:none}
 /* secondary buttons: tinted and outlined so they read as buttons, not as text */
 button.ghost{background:var(--btn);color:var(--btn-ink);border:1.5px solid var(--btn-line);font-weight:600}
 button.ghost:hover{filter:none;background:var(--lrfd);color:#fff;border-color:var(--lrfd)}
 /* toolbars: segmented toggles above the drawing */
 .bar{display:flex;flex-wrap:wrap;gap:.4rem;align-items:center;margin:.1rem 0 .6rem}
 .bar .lbl{font-size:.72rem;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin-right:.1rem}
 .bar button{width:auto;margin:0;padding:.38rem .8rem;font-size:.82rem;border-radius:7px;
   background:var(--btn);color:var(--btn-ink);border:1.5px solid var(--btn-line);box-shadow:none}
 .bar button[aria-pressed="true"]{background:var(--lrfd);color:#fff;border-color:var(--lrfd)}
 .bar button.big{padding:.5rem 1.4rem;font-size:.86rem;text-transform:uppercase;letter-spacing:.06em}
 .bar select{width:auto;padding:.32rem .5rem;font-size:.84rem}
 .bar .sep{width:1px;align-self:stretch;background:var(--panel-line);margin:0 .2rem}
 .hint{font-size:.76rem;color:var(--muted);margin:.35rem 0 0}
 .spanrow{display:grid;grid-template-columns:auto 1fr;gap:.5rem;align-items:center;margin-top:.35rem}
 .spanrow span{font-size:.78rem;color:var(--muted);min-width:4.2rem}

 table{width:100%;border-collapse:collapse;font-size:.86rem}
 @media (max-width:560px){table{display:block;overflow-x:auto}}
 th,td{text-align:left;padding:.34rem .5rem;border-bottom:1px solid var(--line)}
 th{color:var(--muted);font-weight:600;font-size:.78rem;text-transform:uppercase;letter-spacing:.03em}
 td.n,th.n{text-align:right;font-variant-numeric:tabular-nums}
 tr:last-child td{border-bottom:none}
 details{margin-top:.8rem;border:1px solid var(--line);border-radius:8px;padding:.45rem .75rem}
 summary{cursor:pointer;font-weight:600;font-size:.86rem;color:var(--steel)}
 details table{margin-top:.5rem;font-size:.8rem}
 h3.sub{font-size:.82rem;margin:1rem 0 .1rem;color:var(--steel);font-weight:600}
 /* the section editor: material stacked over size, one section at a time */
 .sect{border:1px solid var(--panel-line);border-left:4px solid var(--sect,#64748b);border-radius:8px;padding:.2rem .8rem .6rem;background:var(--panel)}
 .rowhead{margin:.6rem 0 0;font-size:.72rem;text-transform:uppercase;letter-spacing:.06em;color:var(--steel);font-weight:700}
 .bar button .sw{display:inline-block;width:.7rem;height:.7rem;border-radius:2px;margin-right:.35rem;vertical-align:-1px}
 label.chk{display:flex;gap:.5rem;align-items:center;font-size:.86rem;color:var(--ink);margin:.8rem 0 0}
 label.chk input{width:auto;margin:0}
 label.chk b{color:var(--good);font-weight:600}
 .spanrow{grid-template-columns:auto 1fr auto}
 .spanrow .spsec{width:auto;min-width:4.2rem}
 .jrow{display:grid;grid-template-columns:8rem repeat(3,6.5rem) 1.6rem;gap:.35rem;align-items:end;margin-top:.3rem;justify-content:start}
 .jrow label{font-size:.68rem}
 .jrow .rm{background:transparent;border:0;color:var(--muted);font-size:1.1rem;cursor:pointer;padding:.2rem 0;line-height:1;margin:0;width:auto;box-shadow:none}
 .jrow .off{visibility:hidden}
 @media(max-width:640px){.jrow{grid-template-columns:1fr 1fr}.jrow .rm{grid-column:1/-1;justify-self:end}}
 .pill{display:inline-block;font-size:.7rem;font-weight:700;padding:.12rem .5rem;border-radius:999px}
 .p-ok{background:rgba(13,148,136,.13);color:var(--good)}
 .p-no{background:rgba(192,57,43,.10);color:var(--bad)}
 .kpis{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:.7rem}
 .kpi{background:var(--panel);color:var(--dg-text);border:1px solid var(--panel-line);border-radius:10px;padding:.7rem .85rem}
 .kpi .k{font-size:.72rem;text-transform:uppercase;letter-spacing:.05em;color:var(--dg-muted)}
 .kpi .v{font-size:1.25rem;font-weight:600;margin-top:.1rem}
 .kpi .u{font-size:.78rem;color:var(--dg-muted)}
 .diagrams{background:var(--panel);border:1px solid var(--panel-line);border-radius:12px;padding:1rem 1.1rem;margin-bottom:1.1rem}
 .diagrams h2{color:var(--dg-text);border-bottom-color:var(--panel-line)}
 .diagrams .cap{color:var(--dg-muted);font-size:.8rem;margin:.1rem 0 .5rem}
 .diagrams .plot{margin-bottom:.7rem}
 .diagrams .plot[hidden]{display:none}
 svg{display:block;width:100%;height:auto;background:var(--panel2);border:1px solid var(--panel-line);border-radius:8px}
 .warn{background:var(--warn-bg);border:1px solid var(--warn-line);border-left:4px solid var(--rust);
   border-radius:8px;padding:.6rem .85rem;font-size:.86rem;margin-bottom:1rem}
 .cite{font-size:.77rem;color:var(--muted);font-family:ui-monospace,monospace}
 .gate{border:1px dashed var(--line);border-radius:8px;padding:.75rem .9rem;margin-top:.8rem;
   font-size:.84rem;color:var(--muted)}
 footer{max-width:1180px;margin:0 auto;padding:1.4rem 1.4rem 3rem;color:var(--muted);
   font-size:.84rem;border-top:1px solid var(--line)}
 .mark{font-weight:600;color:var(--steel)}
/* print: ink on paper whatever the screen mode */
 @media print{:root{--ink:#000;--muted:#333;--line:#999;--card:#fff;--field:#fff;--soft:#fff;
   --panel:#fff;--panel2:#fff;--panel-line:#999;--dg-text:#000;--dg-muted:#333;--dg-faint:#999;--dg-support:#000}
   .bar{display:none}}
/* a phone: a load row folds to two columns, remove button on its own line */
 @media(max-width:640px){.loadrow,#loads.onecase .loadrow{grid-template-columns:1fr 1fr;padding-bottom:.5rem;border-bottom:1px solid var(--line)}
  .loadrow .rm{grid-column:1/-1;justify-self:end;font-size:.8rem}.loadrow .rm::after{content:' remove'}}