:root{
  --bg: #f6f8fb;
  --panel: #ffffff;
  --ink: #0f172a;
  --muted: #475569;
  --line: rgba(15, 23, 42, .10);
  --brand: #1f3b63;
  --brand2: rgba(31, 59, 99, .10);
  --shadow: 0 8px 30px rgba(2, 6, 23, .08);
  --radius: 16px;
}

*{ box-sizing:border-box; }
html,body{ min-height:100%; }
body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color:var(--ink);
  background: linear-gradient(180deg, var(--brand2), transparent 240px), var(--bg);
  display:flex;
  flex-direction:column;
  min-height:100vh;
  overflow:auto;
}

a{ color:inherit; text-decoration:none; }
a:hover{ text-decoration:underline; }

.topbar{
  position:sticky; top:0; z-index:50;
  display:flex; align-items:center; justify-content:space-between;
  padding:14px 18px;
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.brand{ display:flex; align-items:center; gap:12px; }
.brand img{ height:40px; width:auto; border-radius:10px; box-shadow: var(--shadow); background:#fff; }
.brand-title{ font-weight:800; letter-spacing:.2px; font-size:18px; }
.brand-subtitle{ color:var(--muted); font-size:13px; margin-top:2px; }

.top-actions {
display: flex;
  align-items: center;
  gap: 12px;
}

.iconbtn{
  display:inline-flex; align-items:center; justify-content:center;
  width:40px; height:40px;
  border:1px solid var(--line);
  border-radius:12px;
  background: var(--panel);
  box-shadow: 0 2px 10px rgba(2,6,23,.05);
  font-weight:700;
}
.iconbtn:hover{ text-decoration:none; border-color: rgba(31,59,99,.35); }

.layout{
  display:grid;
  grid-template-columns: 430px 1fr;
  gap:14px;
  padding:14px;
  min-height:0;
  flex:1;
}

.panel{
  background: var(--panel);
  border:1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding:14px;
}

.sidebar{ display:flex; flex-direction:column; gap:14px; min-height:0; }
.content{ min-width:0; min-height:0; }

.panel-title{
  font-weight:800;
  margin-bottom:10px;
  display:flex;
  align-items:center;
  gap:10px;
}
.hint{ color:var(--muted); font-size:13px; margin-top:8px; line-height:1.35; }

.searchrow{ display:flex; gap:8px; }
input[type="search"]{
  width:100%;
  padding:12px 12px;
  border-radius: 12px;
  border:1px solid var(--line);
  background:#fff;
  outline:none;
}
input[type="search"]:focus{ border-color: rgba(31,59,99,.45); box-shadow: 0 0 0 4px rgba(31,59,99,.12); }

.btn{
  width:44px; min-width:44px;
  border-radius: 12px;
  border:1px solid var(--line);
  background: #fff;
  font-size:22px;
  line-height:1;
  cursor:pointer;
}
.btn:hover{ border-color: rgba(31,59,99,.35); }

.filters{ margin-top:12px; display:grid; gap:6px; }
.label{ font-size:12px; color:var(--muted); }
select{
  width:100%;
  padding:10px 12px;
  border-radius: 12px;
  border:1px solid var(--line);
  background:#fff;
}

.letters{
  display:flex; flex-wrap:wrap; gap:2px;
  padding-bottom:10px;
  border-bottom:1px solid var(--line);
  margin-bottom:12px;
}
.letter{
  display:inline-flex;
  align-items:center; justify-content:center;
  min-width:24px; height:24px;
  padding:0 4px;
  border-radius: 999px;
  border:1px solid var(--line);
  background:#fff;
  font-weight:700;
  font-size:12px;
}
.letter:hover{ text-decoration:none; border-color: rgba(31,59,99,.35); }

.topics{
  max-height: 60vh;
  overflow:auto;
  padding-right:6px;
}
.topic-section{ margin-bottom:14px; }
.topic-header{
  position:sticky; top:0;
  z-index:10;
  background: #fff;
  padding:8px 10px;
  border-radius: 12px;
  border:1px solid var(--line);
  font-weight:900;
  margin-bottom:8px;
}
.topic-list{ margin:0; padding:0; list-style:none; }
.topic-list li{ margin:6px 0; padding-left:14px; position:relative; }
.topic-list li::before{ content:"•"; position:absolute; left:0; top:0; }
.topic-link{ display:inline; }
.empty{ color:var(--muted); padding:10px 4px; }

.subbar{
  display:flex; gap:10px; align-items:center; justify-content:space-between;
  border-top:1px solid var(--line);
  padding-top:10px; margin-top:8px;
}
.status{ color:var(--muted); font-size:13px; }
.pill{
  display:inline-flex; align-items:center;
  padding:6px 10px;
  border-radius:999px;
  border:1px solid var(--line);
  background:#fff;
  color:var(--muted);
  font-size:12px;
}

.split{ display:grid; grid-template-columns: 240px 1fr; gap:14px; margin-top:12px; flex:1; min-height:400px; }

.list{ border:1px solid var(--line); border-radius: 14px; padding:10px; overflow:auto; background: rgba(255,255,255,.65); min-height:200px; max-height:70vh; }

.year{ margin-bottom:14px; }
.year-head{
  font-weight:900;
  padding:8px 10px;
  border-radius: 12px;
  background: rgba(31,59,99,.08);
  border:1px solid rgba(31,59,99,.12);
  margin-bottom:8px;
}
.nl-list{ list-style:none; padding:0; margin:0; }
.nl-list li{ margin:6px 0; }
.nl-link{
  display:block;
  padding:8px 10px;
  border-radius:12px;
  border:1px solid transparent;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
  font-size:13px;
}
.nl-link:hover{
  text-decoration:none;
  background: rgba(31,59,99,.06);
  border-color: rgba(31,59,99,.12);
}
.nl-link.active{
  background: rgba(34, 197, 94, .13);
  border-color: rgba(34, 197, 94, .38);
}

.topic-link.active-topic{
  background: rgba(34, 197, 94, .15);
  border-radius: 6px;
  padding: 1px 6px;
  margin-left: -6px;
  outline: 1px solid rgba(34, 197, 94, .4);
}

.viewer{ border:1px solid var(--line); border-radius: 14px; overflow:hidden; background:#fff; min-width:0; display:flex; flex-direction:column; position:relative; min-height:400px; }
.viewerbar{
  display:flex; align-items:center; justify-content:space-between; gap:10px;
  padding:10px 12px;
  border-bottom:1px solid var(--line);
  background: rgba(255,255,255,.88);
}
.viewer-title{ font-weight:800; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.btnlink{
  display:inline-flex; align-items:center;
  padding:8px 10px;
  border-radius:12px;
  border:1px solid var(--line);
  background:#fff;
  text-decoration:none;
  font-size:13px;
}
.btnlink:hover{ border-color: rgba(31,59,99,.35); }

iframe{
  width:100%;
  height:100%;
  border:0;
  flex:1;
  background:#fff;
}

@media (max-width: 1100px){
  .layout{ grid-template-columns: 1fr; }
  .split{ grid-template-columns: 1fr; }
  .topics{ max-height: 50vh; }
  .list{ max-height: 50vh; }
}


/* Viewer overlay message */
.viewer{ position: relative; }
.frame-msg{
  position:absolute;
  inset: 52px 14px 14px 14px;
  background: rgba(255,255,255,.92);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 16px 16px 14px;
  display:flex;
  flex-direction:column;
  gap: 10px;
  justify-content:center;
  align-items:flex-start;
}
.frame-msg.hidden{ display:none; }
.fm-title{ font-weight: 700; font-size: 16px; }
.fm-sub{ color: var(--muted); font-size: 13px; line-height:1.3; }
.fm-actions{ margin-top: 4px; }

main.layout{ flex:1; }

.sidebar .panel:last-child{ flex:1; display:flex; flex-direction:column; }
.topics{ flex:1; overflow:auto; padding-right:6px; max-height: 60vh; }
.content > .panel{ display:flex; flex-direction:column; }

.viewer iframe{ flex:1; width:100%; border:0; background:#fff; min-height:350px; }
.letter.active{ background: var(--brand); color:#fff; border-color: transparent; }
.letter.ghost{ opacity:.6; }

/* header logo */
.header-logo{
  height: 32px;   /* probeer 28–36px */
  width: auto;
}

@media (max-width: 600px){
  .header-logo{
    height: 26px;
  }
}

.top-actions{
  display:flex;
  align-items:center;
  gap:12px;
}

.version-number {
font-size: 14px;
  color: #333;
  text-align: right;
  margin-top: 0;
  position: relative;
  top: 4px; /* iets lager t.o.v. het logo rechts */
}

.update-block {
display: flex;
  align-items: center;
  gap: 10px;
}