:root{
  --bg:#ffffff;
  --panel:#ffffff;
  --panel2:#f4f6fb;
  --ink:#1a2233;
  --muted:#586074;
  --line:#d3dae7;
  --accent:#1f6fd6;
  --accent-soft:#eaf2fd;
  --good:#1a8f5e;
  --good-soft:#eaf7f0;
  --bad:#c23b4b;
  --bad-soft:#fdeef0;
  --warn:#b5710a;
  --shadow:0 1px 3px rgba(20,30,60,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);
  color:var(--ink);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
header.top{
  position:sticky;top:0;z-index:50;
  backdrop-filter:blur(8px);
  background:rgba(255,255,255,.9);
  border-bottom:1px solid var(--line);
}
.top-inner{
  max-width:1000px;margin:0 auto;padding:12px 20px;
  display:flex;align-items:center;gap:18px;flex-wrap:wrap;
}
.brand{font-weight:800;letter-spacing:.2px;font-size:1.05rem}
.brand span{color:var(--accent)}
nav.jump{display:flex;gap:6px;flex-wrap:wrap;margin-left:auto}
nav.jump a{
  color:var(--muted);text-decoration:none;font-size:.86rem;
  padding:6px 11px;border-radius:999px;border:1px solid transparent;
  transition:.15s;
}
nav.jump a:hover{color:var(--ink);border-color:var(--line);background:var(--panel2)}
nav.jump a.side{color:var(--accent);font-weight:700;background:var(--accent-soft);border-color:var(--line)}
nav.jump a.side:hover{background:#dceafb}

main{max-width:1000px;margin:0 auto;padding:28px 20px 90px}

.hero{
  background:var(--panel2);
  border:1px solid var(--line);border-radius:20px;
  padding:34px 32px;box-shadow:var(--shadow);margin-bottom:14px;
}
.hero h1{margin:0 0 10px;font-size:2.1rem;line-height:1.15}
.hero p{margin:0;color:var(--muted);font-size:1.06rem;max-width:72ch}
.pill{
  display:inline-block;font-size:.76rem;letter-spacing:.6px;text-transform:uppercase;
  color:var(--accent);border:1px solid var(--line);border-radius:999px;
  padding:4px 12px;margin-bottom:14px;background:#fff;font-weight:700;
}

.progress-wrap{margin:22px 0 4px}
.progress-bar{height:10px;border-radius:999px;background:#e4e9f2;overflow:hidden;border:1px solid var(--line)}
.progress-fill{height:100%;width:0;background:var(--accent);transition:width .5s ease}
.progress-label{font-size:.85rem;color:var(--muted);margin-top:8px}

section.lesson{
  background:var(--panel);border:1px solid var(--line);border-radius:18px;
  padding:28px 30px;margin:20px 0;box-shadow:var(--shadow);
}
section.lesson h2{
  font-size:1.5rem;margin:0 0 6px;display:flex;align-items:center;gap:12px;
}
.num{
  flex:0 0 auto;width:36px;height:36px;border-radius:10px;
  display:grid;place-items:center;font-weight:800;font-size:1rem;
  background:var(--accent);color:#fff;
}
section.lesson .sub{color:var(--muted);margin:0 0 18px;font-size:1rem}
section.lesson h3{font-size:1.15rem;margin:26px 0 8px;color:#243149}
p{margin:12px 0}

.box{
  background:var(--panel2);border:1px solid var(--line);border-radius:12px;
  padding:14px 18px;margin:16px 0;
}
.box.tip{border-left:4px solid var(--good)}
.box.note{border-left:4px solid var(--warn)}
.box.rule{border-left:4px solid var(--accent);background:var(--accent-soft)}
.box b{color:#111}
.box .rlabel{
  display:inline-block;font-size:.72rem;letter-spacing:.6px;text-transform:uppercase;
  color:var(--accent);font-weight:800;margin-bottom:2px;
}

.formula{
  font-family:"Cambria Math","Times New Roman",Georgia,serif;
  background:var(--panel2);border:1px solid var(--line);
  border-radius:10px;padding:14px 18px;margin:14px 0;text-align:center;
  font-size:1.3rem;letter-spacing:.4px;color:#111;
}
.formula small{display:block;font-size:.8rem;color:var(--muted);margin-top:6px;font-family:inherit;letter-spacing:0}
code.inl{
  font-family:"Cambria Math",Georgia,serif;background:var(--panel2);
  padding:2px 8px;border-radius:6px;border:1px solid var(--line);font-size:1.05em;color:#111;
}

.steps{margin:16px 0;border:1px solid var(--line);border-radius:12px;overflow:hidden}
.steps .row{display:flex;gap:0;border-top:1px solid var(--line)}
.steps .row:first-child{border-top:none}
.steps .calc{
  flex:1;padding:11px 18px;font-family:"Cambria Math",Georgia,serif;font-size:1.12rem;
  background:#fff;color:#111;display:flex;align-items:center;
}
.steps .why{
  flex:1;padding:11px 18px;color:var(--muted);font-size:.92rem;background:var(--panel2);
  display:flex;align-items:center;
}
@media(max-width:620px){.steps .row{flex-direction:column}}

.graphwrap{display:flex;gap:20px;flex-wrap:wrap;align-items:center;margin:18px 0}
.graphwrap svg{background:#fff;border:1px solid var(--line);border-radius:12px;flex:0 0 auto}
.graphwrap .caption{flex:1;min-width:220px;color:var(--muted);font-size:.95rem}

/* ---- tilfoejelser til statistik ---- */
.figur{margin:18px 0}
.figur svg{width:100%;height:auto;display:block;background:#fff;border:1px solid var(--line);border-radius:12px}
.figur .caption{color:var(--muted);font-size:.95rem;margin-top:8px}
.to-figurer{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px}

.datapanel{background:#12233c;color:#e8eff7;border-radius:14px;padding:22px 24px 16px;margin:18px 0}
.datapanel h4{margin:0 0 10px;color:#fff;font-size:1.05rem}
.datapanel svg{width:100%;height:auto;display:block}
.datapanel .kilde{color:#93a8c4;font-size:.8rem;margin:12px 0 0}

.datatabel{width:100%;border-collapse:collapse;margin:14px 0;font-size:.95rem}
.datatabel th,.datatabel td{border:1px solid var(--line);padding:8px 12px;text-align:left}
.datatabel th{background:var(--panel2);font-weight:700;font-size:.85rem;text-transform:uppercase;letter-spacing:.04px;color:var(--muted)}
.datatabel td.tal,.datatabel th.tal{text-align:right;font-variant-numeric:tabular-nums}
.tabelrul{overflow-x:auto}

.cirkelblok{display:grid;grid-template-columns:minmax(180px,260px) 1fr;gap:24px;align-items:center;margin:18px 0}
@media(max-width:620px){.cirkelblok{grid-template-columns:1fr}}
.cirkelblok svg{width:100%;height:auto}
.legende{list-style:none;margin:0;padding:0;font-size:.95rem}
.legende li{display:flex;align-items:baseline;gap:10px;padding:7px 0;border-bottom:1px solid var(--line)}
.legende i{width:12px;height:12px;border-radius:3px;flex:none;transform:translateY(1px)}
.legende b{margin-left:auto;font-variant-numeric:tabular-nums}

.opg{border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:12px;padding:18px 22px;margin:18px 0;background:#fff}
.opg h4{margin:0 0 4px;font-size:1.05rem;display:flex;align-items:baseline;gap:10px}
.opg h4 em{
  font-style:normal;font-size:.7rem;letter-spacing:.7px;text-transform:uppercase;
  background:var(--accent);color:#fff;padding:3px 9px;border-radius:999px;flex:none;font-weight:800;
}
.opg ol{margin:10px 0 0;padding-left:22px}
.opg ol li{margin-bottom:7px}
.opg p{margin:8px 0 0}

/* QUIZ */
.quiz{
  background:var(--panel2);
  border:1px solid var(--line);
  border-radius:18px;padding:24px 28px;margin:24px 0;box-shadow:var(--shadow);
}
.quiz .qhead{display:flex;align-items:center;gap:12px;margin-bottom:4px;flex-wrap:wrap}
.quiz .qtag{
  font-size:.72rem;letter-spacing:.7px;text-transform:uppercase;color:#fff;
  background:var(--accent);padding:4px 11px;border-radius:999px;font-weight:800;
}
.quiz h3{margin:0;font-size:1.22rem}
.quiz .qsub{color:var(--muted);margin:6px 0 16px;font-size:.95rem}
.q{margin:18px 0;padding-top:18px;border-top:1px dashed var(--line)}
.q:first-of-type{border-top:none;padding-top:0}
.q .qtext{font-weight:600;margin-bottom:12px;font-size:1.04rem}
.q .qtext .qn{color:var(--accent);font-weight:800;margin-right:6px}
.lvl{
  display:inline-block;font-size:.68rem;letter-spacing:.5px;text-transform:uppercase;
  border:1px solid var(--line);border-radius:999px;padding:2px 9px;margin-left:8px;
  color:var(--muted);font-weight:700;vertical-align:middle;background:#fff;
}
.opts{display:grid;gap:9px}
.opt{
  text-align:left;width:100%;cursor:pointer;
  background:#fff;border:1.5px solid var(--line);color:var(--ink);
  padding:11px 15px;border-radius:10px;font-size:1rem;font-family:inherit;
  transition:.15s;display:flex;align-items:center;gap:10px;
}
.opt:hover:not(:disabled){border-color:var(--accent);background:var(--accent-soft)}
.opt .mk{
  flex:0 0 auto;width:24px;height:24px;border-radius:7px;border:1.5px solid var(--line);
  display:grid;place-items:center;font-weight:800;font-size:.85rem;color:var(--muted);background:#fff;
}
.opt.correct{border-color:var(--good);background:var(--good-soft)}
.opt.correct .mk{background:var(--good);color:#fff;border-color:var(--good)}
.opt.wrong{border-color:var(--bad);background:var(--bad-soft)}
.opt.wrong .mk{background:var(--bad);color:#fff;border-color:var(--bad)}
.opt:disabled{cursor:default}
.fb{
  margin-top:12px;padding:11px 15px;border-radius:10px;font-size:.95rem;display:none;
}
.fb.show{display:block}
.fb.ok{background:var(--good-soft);border:1px solid var(--good);color:#12633f}
.fb.no{background:var(--bad-soft);border:1px solid var(--bad);color:#8f2733}
.fb b{color:#111}

.scorebar{
  margin-top:16px;font-size:.95rem;color:var(--muted);
  display:flex;align-items:center;gap:10px;flex-wrap:wrap;
}
.scorebar .badge{
  background:#fff;border:1px solid var(--line);border-radius:999px;
  padding:5px 14px;font-weight:700;color:var(--ink);
}
.final-note{text-align:center;color:var(--muted);margin-top:16px;font-size:.95rem}

footer{max-width:1000px;margin:0 auto;padding:0 20px 60px;color:var(--muted);font-size:.85rem;text-align:center}

.cheat{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:16px 0}
@media(max-width:620px){.cheat{grid-template-columns:1fr}}
.cheat .card{background:var(--panel2);border:1px solid var(--line);border-radius:10px;padding:14px 16px}
.cheat .card h4{margin:0 0 6px;font-size:1rem;color:#243149}
.cheat .card p{margin:0;font-size:.92rem;color:var(--muted)}

.printbtn{
  display:inline-flex;align-items:center;gap:8px;margin-top:18px;
  background:#fff;border:1px solid var(--line);color:var(--ink);
  padding:9px 16px;border-radius:10px;font-size:.92rem;font-family:inherit;cursor:pointer;
  font-weight:600;
}
.printbtn:hover{border-color:var(--accent);color:var(--accent)}

.btn{background:var(--accent);color:#fff;border:none;padding:11px 20px;border-radius:10px;font-size:1rem;font-weight:700;font-family:inherit;cursor:pointer;transition:.15s}
.btn:hover{background:#195cb5}
.btn.ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}
.btn.ghost:hover{border-color:var(--accent);color:var(--accent)}

.overlay{position:fixed;inset:0;z-index:100;background:rgba(26,34,51,.55);backdrop-filter:blur(3px);display:grid;place-items:center;padding:20px}
.overlay.hidden{display:none}
.overlay .card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:30px 32px;max-width:440px;width:100%;box-shadow:0 20px 50px rgba(20,30,60,.25)}
.overlay h2{margin:0 0 6px;font-size:1.5rem}
.overlay p{margin:0 0 18px;color:var(--muted)}
.overlay input{width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:10px;font-size:1.05rem;font-family:inherit;margin-bottom:14px}
.overlay input:focus{outline:none;border-color:var(--accent)}
.overlay .btnrow{display:flex;gap:10px;flex-wrap:wrap}

.welcome{display:none;align-items:center;gap:12px;flex-wrap:wrap;margin-top:18px;padding:14px 16px;background:#fff;border:1px solid var(--line);border-radius:12px}
.welcome.show{display:flex}
.welcome .hi{font-weight:800;font-size:1.05rem}
.welcome .live{color:var(--muted);font-size:.95rem}
.welcome .spacer{margin-left:auto}
.welcome .btn{padding:8px 14px;font-size:.9rem}

#results .rtable{width:100%;border-collapse:collapse;margin-top:10px}
#results .rtable th,#results .rtable td{border:1px solid var(--line);padding:9px 12px;text-align:left;font-size:.98rem}
#results .rtable th{background:var(--panel2);font-weight:700}
#results .rtable tr.total td{font-weight:800;background:var(--accent-soft)}
#results .grade{font-size:1.08rem;margin-top:16px;font-weight:600}

@media print{
  @page{margin:16mm}
  body{background:#fff;color:#000;font-size:11.5pt;line-height:1.45}
  header.top,nav.jump,.progress-wrap,.printbtn,.overlay,.welcome .btn{display:none !important}
  .welcome{border:1px solid #999;background:#fff !important}
  main{max-width:none;padding:0}
  .hero,section.lesson,.quiz,.box,.steps,.cheat .card,.formula,.graphwrap svg,.opg,.datapanel,.figur svg{
    box-shadow:none !important;
  }
  .hero,section.lesson,.quiz{
    border:1px solid #999;background:#fff !important;border-radius:0;
    padding:14px 16px;margin:10px 0;break-inside:avoid;page-break-inside:avoid;
  }
  section.lesson h2,.quiz h3,section.lesson h3{break-after:avoid}
  .num{background:#fff !important;color:#000;border:1.5px solid #000}
  .pill,.qtag,.opg h4 em{background:#fff !important;color:#000 !important;border:1px solid #000}
  .box,.box.rule{background:#fff !important;border:1px solid #bbb;border-left:3px solid #000}
  .rlabel{color:#000 !important}
  .formula,.steps .calc,.opt,.opt .mk,.cheat .card,.datatabel th{background:#fff !important}
  .steps .why{background:#fff !important;color:#333}
  .datapanel{background:#fff !important;color:#000;border:1px solid #999}
  .datapanel h4,.datapanel .kilde{color:#000}
  .datapanel text{fill:#000 !important}
  .datapanel rect{fill:#666 !important}
  .opt{border:1px solid #888}
  .opt .mk{border:1px solid #000;color:#000}
  .opt.correct,.opt.wrong{background:#fff !important;border:1px solid #888 !important}
  .opt.correct .mk,.opt.wrong .mk{background:#fff !important;color:#000 !important;border:1px solid #000}
  .fb{display:none !important}
  .q,.opg{break-inside:avoid;page-break-inside:avoid}
  a{color:#000;text-decoration:none}
  svg line[stroke="#1f6fd6"],svg line[stroke="#4f9dff"]{stroke:#000 !important}
  .graphwrap svg circle{fill:#000 !important}
  .caption{color:#333}
}