/* Illinois Concrete Pipe Handbook — engineering-document theme */
:root{
  --ink:#22262b; --ink-soft:#4c545d; --rule:#d5d8d2; --paper:#f4f5f2;
  --paper-warm:#eceee8; --blue:#1f4e79; --blue-dk:#163a5a; --rust:#c4622d;
  --band:#e8ebe6; --white:#ffffff;
  --serif:Georgia,"Iowan Old Style","Times New Roman",serif;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);
  font-size:17px;line-height:1.65;}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue);text-decoration:underline;text-underline-offset:2px}
a:hover{color:var(--rust)}
.skip{position:absolute;left:-9999px}
.skip:focus{left:8px;top:8px;background:var(--white);padding:.5rem .75rem;z-index:50;border:2px solid var(--blue)}

/* masthead */
.masthead{background:var(--blue);color:#eef2f6;border-bottom:4px solid var(--blue-dk)}
.masthead .inner{max-width:1240px;margin:0 auto;padding:1.15rem 1.25rem;
  display:flex;flex-wrap:wrap;align-items:baseline;gap:.35rem 1.25rem;min-width:0}
.wordmark{font-family:var(--serif);font-size:1.5rem;line-height:1.2;letter-spacing:.01em;
  margin:0;color:#fff;min-width:0}
.wordmark a{color:#fff;text-decoration:none}
.wordmark a:hover{color:#ffd9c2}
.masthead p{margin:0;font-size:.86rem;color:#c6d6e4;max-width:62ch;min-width:0}

/* layout */
.shell{max-width:1240px;margin:0 auto;padding:0 1.25rem;display:flex;flex-wrap:wrap;
  gap:2.5rem;align-items:flex-start;min-width:0}
.sidebar{position:static;flex:0 1 236px;min-width:0;padding:1.75rem 0 1rem;
  border-right:1px solid var(--rule)}
.sidebar h2{font-family:var(--sans);font-size:.7rem;text-transform:uppercase;
  letter-spacing:.12em;color:var(--ink-soft);margin:1.5rem 0 .4rem;font-weight:700}
.sidebar h2:first-child{margin-top:0}
.sidebar ul{list-style:none;margin:0 0 .25rem;padding:0}
.sidebar li{margin:0}
.sidebar a{display:block;padding:.2rem 0 .2rem .6rem;border-left:2px solid transparent;
  font-size:.88rem;text-decoration:none;color:var(--ink);line-height:1.4}
.sidebar a:hover{border-left-color:var(--rust);color:var(--rust);background:var(--paper-warm)}
.sidebar a[aria-current="page"]{border-left-color:var(--blue);color:var(--blue);font-weight:700}
.navtoggle{display:none}

main{flex:1 1 520px;min-width:0;padding:1.75rem 0 2.5rem;max-width:82ch}

/* typography */
h1{font-family:var(--serif);font-size:2.05rem;line-height:1.18;margin:0 0 .35rem;
  font-weight:400;letter-spacing:-.005em}
h1+p{font-size:1.06rem;color:var(--ink-soft)}
h2{font-family:var(--serif);font-size:1.35rem;font-weight:400;margin:2.1rem 0 .5rem;
  padding-bottom:.3rem;border-bottom:1px solid var(--rule)}
h3{font-family:var(--sans);font-size:1rem;font-weight:700;margin:1.5rem 0 .35rem;
  letter-spacing:.005em}
p{margin:0 0 .95rem;max-width:72ch}
ul,ol{margin:0 0 1.05rem;padding-left:1.15rem;max-width:72ch}
li{margin:0 0 .38rem}
strong{font-weight:700}
em{font-style:italic}
main>ul li::marker{color:var(--rust)}
.figure{margin:1.3rem 0 1.5rem}
.figure img{border:1px solid var(--rule)}
.figure figcaption{font-size:.8rem;color:var(--ink-soft);padding-top:.4rem;
  border-top:1px solid var(--rule);margin-top:.4rem}

/* data tables */
.tablewrap{overflow-x:auto;margin:1.1rem 0 1.6rem;border:1px solid var(--rule);
  background:var(--white);max-width:100%}
.tablewrap:focus{outline:2px solid var(--blue);outline-offset:2px}
table.data{border-collapse:collapse;width:100%;font-size:.8rem;font-variant-numeric:tabular-nums}
table.data caption{caption-side:top;text-align:left;font-size:.78rem;color:var(--ink-soft);
  padding:.6rem .7rem;background:var(--band);border-bottom:1px solid var(--rule);
  font-weight:700;line-height:1.4}
table.data th,table.data td{padding:.3rem .55rem;border-bottom:1px solid var(--rule);
  text-align:right;white-space:nowrap}
table.data thead th{position:sticky;top:0;background:var(--paper-warm);text-align:right;
  font-size:.72rem;line-height:1.25;vertical-align:bottom;white-space:normal;min-width:5.2rem;
  border-bottom:2px solid var(--blue);font-weight:700}
table.data thead th:first-child{text-align:left}
table.data tbody th{text-align:left;font-weight:700;background:var(--paper);
  font-family:var(--mono);font-size:.76rem;white-space:normal;min-width:8rem}
table.data tbody tr:nth-child(even) td{background:#fafbf9}
table.data tbody tr:hover td{background:#f0f4f7}

/* callouts */
.notice{border-left:3px solid var(--rust);background:var(--paper-warm);padding:.85rem 1rem;
  margin:1.3rem 0;font-size:.92rem}
.notice p:last-child{margin-bottom:0}
.notice strong{color:var(--blue-dk)}

/* homepage lede */
.lede{font-size:1.12rem;line-height:1.6}

/* footer */
footer{background:var(--band);border-top:3px solid var(--blue);margin-top:2rem}
.footinner{max-width:1240px;margin:0 auto;padding:1.9rem 1.25rem 2.2rem;
  display:flex;flex-wrap:wrap;gap:2rem;min-width:0}
.footcol{flex:1 1 260px;min-width:0}
.footcol h2{font-family:var(--sans);font-size:.7rem;text-transform:uppercase;
  letter-spacing:.12em;border:0;margin:0 0 .5rem;padding:0;color:var(--ink-soft);font-weight:700}
.footcol ul{list-style:none;padding:0;margin:0;columns:2;column-gap:1.5rem}
.footcol li{margin:0 0 .25rem;break-inside:avoid}
.footcol a{font-size:.83rem;text-decoration:none}
.footcol a:hover{text-decoration:underline}
.footnote{font-size:.78rem;color:var(--ink-soft);line-height:1.55}
.colophon{border-top:1px solid var(--rule);font-size:.76rem;color:var(--ink-soft);
  padding:.9rem 1.25rem 1.4rem;max-width:1240px;margin:0 auto}

@media (max-width:860px){
  body{font-size:16px}
  .shell{gap:0;flex-direction:column}
  .sidebar{flex:1 1 auto;width:100%;border-right:0;border-bottom:1px solid var(--rule);
    padding:1rem 0}
  .sidebar .navbody{display:none}
  .sidebar .navbody.open{display:block}
  .navtoggle{display:inline-block;font:inherit;font-size:.85rem;font-weight:700;
    background:var(--white);color:var(--blue);border:1px solid var(--blue);
    padding:.45rem .9rem;cursor:pointer}
  .footcol ul{columns:1}
  h1{font-size:1.7rem}
  main{padding-top:1.25rem}
}
@media print{
  .sidebar,.navtoggle,footer{display:none}
  body{background:#fff;font-size:11pt}
  .tablewrap{overflow:visible;border:0}
}