:root{
  --ink:#1b2430;
  --ink-soft:#4b5666;
  --paper:#f6f7f5;
  --panel:#ffffff;
  --rail:#12181f;
  --rail-soft:#8b98a8;
  --line:#dfe3e6;
  --accent:#1f6f5c;
  --accent-soft:#e4f0ec;
  --amber:#a8681f;
  --mono:'IBM Plex Mono','SF Mono',Consolas,monospace;
  --sans:'IBM Plex Sans','Segoe UI',Arial,sans-serif;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
html,body{margin:0;padding:0;}
body{
  font-family:var(--sans);
  background:var(--paper);
  color:var(--ink);
  min-height:100vh;
}

/* ---------- Topbar (alleen mobiel) ---------- */
#topbar{
  display:none;
  position:sticky; top:0; z-index:60;
  background:var(--rail); color:#eef1f3;
  padding:10px 14px;
  align-items:center; gap:12px;
  border-bottom:1px solid #26313d;
}
#topbar .tb-title{font-size:15px;font-weight:600;letter-spacing:-.01em;}
#topbar .tb-page{font-family:var(--mono);font-size:11px;color:#5f7a8f;display:block;}
#menu-btn{
  background:#1c2530;border:1px solid #2a3542;color:#dfe6ea;
  border-radius:6px;padding:8px 11px;font-size:16px;line-height:1;cursor:pointer;
}
#menu-btn:focus-visible{outline:2px solid var(--accent);}

/* ---------- Zijbalk ---------- */
#rail{
  width:290px; flex-shrink:0;
  background:var(--rail); color:var(--rail-soft);
  position:fixed; top:0; left:0; bottom:0;
  overflow-y:auto; padding:22px 0 40px;
  z-index:70;
}
#rail::-webkit-scrollbar{width:8px;}
#rail::-webkit-scrollbar-thumb{background:#26313d;border-radius:4px;}
.brand{padding:0 22px 18px;border-bottom:1px solid #26313d;margin-bottom:14px;}
.brand .tag{font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:#5f7a8f;text-transform:uppercase;}
.brand h1{font-size:19px;margin:6px 0 0;color:#eef1f3;font-weight:600;letter-spacing:-.01em;}
.brand h1 a{color:inherit;text-decoration:none;}
#search-wrap{padding:0 18px 12px;}
#search{
  width:100%;background:#1c2530;border:1px solid #2a3542;color:#dfe6ea;
  padding:9px 11px;border-radius:6px;font-family:var(--sans);font-size:13.5px;outline:none;
}
#search::placeholder{color:#5f7a8f;}
#search:focus{border-color:var(--accent);}
.search-hint{font-family:var(--mono);font-size:10.5px;color:#4b6072;padding:0 22px 8px;}
.railgroup-label{
  font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;
  color:#4b6072;padding:14px 22px 6px;
}
nav ul{list-style:none;margin:0;padding:0 10px;}
nav li{margin:1px 0;}
nav a{
  display:block;padding:7px 12px;border-radius:6px;color:var(--rail-soft);
  text-decoration:none;font-size:13.5px;line-height:1.3;transition:background .12s,color .12s;
}
nav a .num{font-family:var(--mono);color:#4b6072;margin-right:6px;font-size:11.5px;}
nav a:hover{background:#1c2530;color:#eef1f3;}
nav a.active{background:var(--accent);color:#fff;}
nav a.active .num{color:#cfe9e0;}
nav li.hidden{display:none;}
#rail-overlay{display:none;}

/* ---------- Hoofdkolom ---------- */
#main{margin-left:290px;max-width:960px;padding:44px 56px 120px;}
header.top{margin-bottom:26px;padding-bottom:22px;border-bottom:2px solid var(--ink);}
header.top .kicker{
  font-family:var(--mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;
  color:var(--accent);margin-bottom:8px;
}
header.top h1{font-size:32px;margin:0 0 10px;letter-spacing:-.015em;}
header.top p{color:var(--ink-soft);font-size:15px;max-width:700px;margin:0;line-height:1.6;}

/* ---------- Advertentie-placeholder ---------- */
.ad-slot{
  margin:0 0 36px;
  border:2px dashed #c3ccd2;
  border-radius:8px;
  background:repeating-linear-gradient(-45deg,#f1f3f2,#f1f3f2 12px,#eceeee 12px,#eceeee 24px);
  min-height:92px;
  display:flex;align-items:center;justify-content:center;flex-direction:column;gap:4px;
  color:#8a95a0;text-align:center;padding:14px;
}
.ad-slot .ad-label{font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;}
.ad-slot .ad-note{font-size:12.5px;}

/* ---------- Inhoud ---------- */
section.chapter{margin-bottom:56px;padding-top:8px;scroll-margin-top:24px;}
section.chapter h2{font-size:23px;margin:0 0 4px;display:flex;align-items:baseline;gap:10px;}
section.chapter h2 .idx{font-family:var(--mono);color:var(--accent);font-size:15px;}
section.chapter > .intro{color:var(--ink-soft);font-size:14.5px;margin:6px 0 20px;max-width:720px;}
h3.sub{
  font-size:16px;margin:28px 0 10px;color:var(--ink);border-left:3px solid var(--accent);
  padding-left:10px;scroll-margin-top:24px;
}
h4.subsub{font-size:14px;margin:20px 0 6px;color:var(--ink);}
p{line-height:1.65;font-size:14.5px;}
ul,ol{line-height:1.65;font-size:14.5px;padding-left:24px;}
li{margin:3px 0;}
dl.glossary dt{font-family:var(--mono);font-weight:600;color:var(--ink);margin-top:14px;}
dl.glossary dd{margin:2px 0 0;color:var(--ink-soft);font-size:13.5px;line-height:1.55;}
a.xref{color:var(--accent);text-decoration:none;border-bottom:1px dotted var(--accent);}
a.xref:hover{border-bottom-style:solid;}
a.ext{color:var(--accent);}

.pagetoc{
  border:1px solid var(--line);background:var(--panel);border-radius:8px;
  padding:14px 18px;margin:0 0 36px;
}
.pagetoc .pt-label{font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-soft);margin-bottom:8px;}
.pagetoc ul{list-style:none;margin:0;padding:0;columns:2;column-gap:28px;font-size:13.5px;}
.pagetoc li{margin:4px 0;break-inside:avoid;}
.pagetoc a{color:var(--ink);text-decoration:none;}
.pagetoc a:hover{color:var(--accent);}
.pagetoc .num{font-family:var(--mono);color:var(--accent);font-size:11.5px;margin-right:6px;}
@media (max-width:640px){.pagetoc ul{columns:1;}}

.tablewrap{overflow-x:auto;margin:14px 0 20px;}
table{
  width:100%;border-collapse:collapse;font-size:13.5px;
  background:var(--panel);border:1px solid var(--line);min-width:420px;
}
.tablewrap table{margin:0;}
th,td{text-align:left;padding:8px 12px;border-bottom:1px solid var(--line);vertical-align:top;}
th{
  background:#eef1ef;font-family:var(--mono);font-size:11.5px;letter-spacing:.04em;
  text-transform:uppercase;color:var(--ink-soft);
}
tr:last-child td{border-bottom:none;}
td code,th code{background:none;padding:0;}
code{
  font-family:var(--mono);background:var(--accent-soft);color:#164638;
  padding:1px 5px;border-radius:4px;font-size:.92em;
  overflow-wrap:anywhere;
}
pre{
  background:#0f1620;color:#d9e2ea;padding:14px 16px;border-radius:8px;overflow-x:auto;
  font-family:var(--mono);font-size:13px;line-height:1.55;margin:12px 0 20px;border:1px solid #1c2530;
}
pre code{background:none;color:inherit;padding:0;overflow-wrap:normal;}
.cm{color:#6f8299;}
.kw{color:#7fb6a8;}
.str{color:#d3a86b;}
.callout{
  border:1px solid var(--line);border-left:4px solid var(--amber);background:#fbf3e8;
  padding:12px 16px;border-radius:6px;font-size:13.5px;margin:16px 0 20px;line-height:1.6;
}
.callout strong{color:var(--amber);}
.callout.info{border-left-color:var(--accent);background:var(--accent-soft);}
.callout.info strong{color:var(--accent);}
.cmp-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:16px 0 20px;}
.cmp-grid .card{border:1px solid var(--line);background:var(--panel);border-radius:8px;padding:14px 16px;}
.cmp-grid .card h4{
  margin:0 0 8px;font-size:12px;text-transform:uppercase;letter-spacing:.06em;
  color:var(--ink-soft);font-family:var(--mono);
}
@media (max-width:640px){.cmp-grid{grid-template-columns:1fr;}}

/* Sitemap-kaarten op de startpagina */
.sitemap-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:20px 0;}
.sitemap-grid a.smcard{
  display:block;border:1px solid var(--line);background:var(--panel);border-radius:8px;
  padding:16px 18px;text-decoration:none;color:var(--ink);transition:border-color .12s, box-shadow .12s;
}
.sitemap-grid a.smcard:hover{border-color:var(--accent);box-shadow:0 2px 10px rgba(31,111,92,.10);}
.sitemap-grid .smcard .sm-num{font-family:var(--mono);font-size:11px;color:var(--accent);letter-spacing:.08em;}
.sitemap-grid .smcard h3{margin:4px 0 6px;font-size:15.5px;}
.sitemap-grid .smcard p{margin:0;font-size:13px;color:var(--ink-soft);line-height:1.55;}
@media (max-width:640px){.sitemap-grid{grid-template-columns:1fr;}}

/* ---------- Pager & footer ---------- */
.pager{
  display:flex;justify-content:space-between;gap:14px;margin-top:56px;
  border-top:2px solid var(--ink);padding-top:20px;flex-wrap:wrap;
}
.pager a{
  flex:1;min-width:200px;border:1px solid var(--line);background:var(--panel);border-radius:8px;
  padding:12px 16px;text-decoration:none;color:var(--ink);
}
.pager a:hover{border-color:var(--accent);}
.pager .dir{font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-soft);display:block;margin-bottom:3px;}
.pager .pt{font-size:14px;color:var(--accent);}
.pager a.next{text-align:right;}
footer.end{padding-top:20px;margin-top:26px;font-size:13px;color:var(--ink-soft);line-height:1.6;}
footer.end a{color:var(--accent);}
.backtotop{display:inline-block;margin-top:8px;font-size:12px;font-family:var(--mono);color:var(--ink-soft);text-decoration:none;}
.backtotop:hover{color:var(--accent);}

/* ---------- Responsief ---------- */
@media (max-width:980px){
  #topbar{display:flex;}
  #rail{
    transform:translateX(-100%);
    transition:transform .22s ease;
    width:300px;max-width:86vw;
    top:0;box-shadow:4px 0 24px rgba(0,0,0,.35);
  }
  body.menu-open #rail{transform:translateX(0);}
  #rail-overlay{
    display:none;position:fixed;inset:0;background:rgba(10,14,18,.55);z-index:65;
  }
  body.menu-open #rail-overlay{display:block;}
  body.menu-open{overflow:hidden;}
  #main{margin-left:0;max-width:100%;padding:24px 18px 90px;}
  header.top h1{font-size:25px;}
  section.chapter h2{font-size:20px;}
  pre{font-size:12.5px;}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  #rail{transition:none;}
}