:root{
  --ink:#1E2B4F;
  --blue:#2B59C3;
  --blue-soft:#E4ECFB;
  --green:#2E9E6B;
  --green-soft:#E2F4EB;
  --red:#D64550;
  --red-soft:#FBE7E9;
  --yellow:#FFD84D;
  --paper:#FFFFFF;
  --grid:#DDE7F3;
  --muted:#6B7A99;
  --radius:14px;
  --shadow:0 2px 10px rgba(30,43,79,.08);
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{height:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  color:var(--ink);
  background:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px),
    #F7F9FC;
  background-size:24px 24px, 24px 24px, auto;
  min-height:100vh;
}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
input{font-family:inherit}

/* ---------- Header ---------- */
header{
  position:sticky;top:0;z-index:50;
  background:var(--paper);
  border-bottom:3px solid var(--blue);
  box-shadow:var(--shadow);
}
.hd-inner{
  max-width:920px;margin:0 auto;padding:10px 16px;
  display:flex;align-items:center;gap:12px;flex-wrap:wrap;
}
.logo{font-weight:800;font-size:1.25rem;letter-spacing:-.02em;display:flex;align-items:center;gap:8px}
.logo .lg-badge{background:var(--blue);color:#fff;border-radius:8px;padding:2px 8px;font-size:1.05rem}
.hd-stats{margin-left:auto;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.pill{
  background:var(--blue-soft);color:var(--blue);
  border-radius:999px;padding:5px 12px;font-weight:700;font-size:.85rem;
  display:flex;align-items:center;gap:6px;
}
.pill.streak{background:#FFF4D1;color:#9A7400}
.pill.profile{background:var(--green-soft);color:var(--green)}
.pill button{font-size:.75rem;text-decoration:underline;color:inherit;font-weight:600}

/* ---------- Layout ---------- */
main{max-width:920px;margin:0 auto;padding:20px 16px 80px}
.crumbs{display:flex;gap:6px;align-items:center;margin-bottom:16px;font-size:.9rem;color:var(--muted);flex-wrap:wrap}
.crumbs button{color:var(--blue);font-weight:700}
.crumbs span.sep{opacity:.5}

h1{font-size:1.5rem;margin-bottom:4px;letter-spacing:-.02em}
h2{font-size:1.15rem;margin-bottom:10px}
.sub{color:var(--muted);margin-bottom:20px;font-size:.95rem;max-width:60ch}

/* ---------- Kort & login ---------- */
.card{
  background:var(--paper);border-radius:var(--radius);box-shadow:var(--shadow);
  padding:20px;border:1px solid #E8EEF7;
}
.login-wrap{max-width:420px;margin:24px auto 0}
.login-logo{
  width:64px;height:64px;border-radius:16px;background:var(--blue);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:2rem;font-weight:800;
  margin:0 auto 14px;
}
.login-form{display:flex;flex-direction:column;gap:10px;margin-top:14px}
.login-form input{
  padding:12px 14px;border:2px solid var(--grid);border-radius:12px;font-size:1rem;width:100%;
}
.login-form input:focus{outline:none;border-color:var(--blue)}
.login-error{
  background:var(--red-soft);color:var(--red);border-radius:12px;
  padding:11px 14px;font-weight:600;font-size:.9rem;
}
.avatar{
  width:38px;height:38px;border-radius:50%;
  background:var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;
  font-weight:800;font-size:1rem;flex-shrink:0;
}

/* ---------- Klassesti ---------- */
.grade-path{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:6px}
@media(min-width:640px){.grade-path{grid-template-columns:repeat(3,1fr)}}
.grade-node{
  background:var(--paper);border:2px solid #E8EEF7;border-radius:var(--radius);
  padding:16px 14px;display:flex;flex-direction:column;align-items:center;gap:8px;
  box-shadow:var(--shadow);transition:transform .12s,border-color .12s;text-align:center;
}
.grade-node:hover{transform:translateY(-2px);border-color:var(--blue)}
.grade-circle{
  width:56px;height:56px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  font-weight:800;font-size:1.3rem;color:#fff;background:var(--blue);
  position:relative;
}
.grade-circle svg{position:absolute;inset:-6px;width:68px;height:68px;transform:rotate(-90deg)}
.grade-circle circle{fill:none;stroke-width:4}
.gc-bg{stroke:#E8EEF7}
.gc-fg{stroke:var(--green);stroke-linecap:round}
.grade-node .gn-title{font-weight:800}
.grade-node .gn-meta{font-size:.78rem;color:var(--muted)}
.grade-node.done .grade-circle{background:var(--green)}

/* ---------- Kategorier ---------- */
.cat-grid{display:grid;grid-template-columns:1fr;gap:12px}
@media(min-width:600px){.cat-grid{grid-template-columns:1fr 1fr}}
.cat-card{
  background:var(--paper);border:2px solid #E8EEF7;border-radius:var(--radius);
  padding:16px;display:flex;gap:14px;align-items:flex-start;text-align:left;
  box-shadow:var(--shadow);transition:border-color .12s,transform .12s;width:100%;
}
.cat-card:hover{border-color:var(--blue);transform:translateY(-2px)}
.cat-icon{
  font-size:1.5rem;background:var(--blue-soft);border-radius:12px;
  width:48px;height:48px;display:flex;align-items:center;justify-content:center;flex-shrink:0;
}
.cat-card b{display:block;font-size:1rem;margin-bottom:2px}
.cat-card .cc-meta{font-size:.82rem;color:var(--muted)}
.tag{
  display:inline-block;font-size:.7rem;font-weight:800;letter-spacing:.03em;
  padding:2px 8px;border-radius:999px;margin-left:6px;vertical-align:middle;
}
.tag.hoved{background:#FFF4D1;color:#9A7400}
.tag.lommer{background:var(--blue-soft);color:var(--blue)}
.progressbar{height:8px;background:#EEF3FA;border-radius:99px;margin-top:10px;overflow:hidden}
.progressbar i{display:block;height:100%;background:var(--green);border-radius:99px;transition:width .3s}

/* ---------- Opgaver ---------- */
.task{
  background:var(--paper);border:2px solid #E8EEF7;border-radius:var(--radius);
  box-shadow:var(--shadow);margin-bottom:14px;overflow:hidden;
}
.task.correct{border-color:var(--green)}
.task.revealed{border-color:#D9C77A}
.task-head{
  display:flex;align-items:center;gap:10px;padding:14px 16px;width:100%;text-align:left;
}
.task-num{
  background:var(--ink);color:#fff;border-radius:8px;
  min-width:34px;height:28px;display:flex;align-items:center;justify-content:center;
  font-weight:800;font-size:.85rem;flex-shrink:0;
}
.task.correct .task-num{background:var(--green)}
.task-q{font-weight:600;font-size:1rem;flex:1}
.task-pts{font-size:.8rem;font-weight:800;color:var(--muted);flex-shrink:0}
.task-status{font-size:1.1rem;flex-shrink:0}
.task-body{padding:0 16px 16px;border-top:1px dashed var(--grid)}
.answer-row{display:flex;gap:8px;margin:14px 0 10px;flex-wrap:wrap}
.answer-row input{
  flex:1;min-width:140px;padding:11px 14px;font-size:1.05rem;
  border:2px solid var(--grid);border-radius:12px;
}
.answer-row input:focus{outline:none;border-color:var(--blue)}
.btn{
  padding:11px 18px;border-radius:12px;font-weight:800;font-size:.92rem;
  transition:filter .1s;white-space:nowrap;
}
.btn:hover{filter:brightness(.95)}
.btn:disabled{opacity:.6;cursor:wait}
.btn-primary{background:var(--blue);color:#fff}
.btn-ghost{background:var(--blue-soft);color:var(--blue)}
.btn-warn{background:#FFF4D1;color:#9A7400}
.btn-small{padding:8px 13px;font-size:.82rem}
.task-actions{display:flex;gap:8px;flex-wrap:wrap}
.feedback{
  margin:10px 0 4px;padding:12px 14px;border-radius:12px;font-weight:600;font-size:.95rem;
}
.feedback.ok{background:var(--green-soft);color:var(--green)}
.feedback.no{background:var(--red-soft);color:var(--red)}
.hintbox,.facitbox{
  margin-top:10px;padding:12px 14px;border-radius:12px;font-size:.92rem;line-height:1.5;
}
.hintbox{background:#FFF9E3;border:1px solid #F0DE9A}
.facitbox{background:var(--blue-soft);border:1px solid #C4D5F5}
.facitbox b{font-size:1.05rem}

/* ---------- Forklaring ---------- */
.explain{
  background:#FBFCFF;border:2px solid var(--blue-soft);border-radius:var(--radius);
  padding:18px;margin-bottom:18px;
}
.explain h3{font-size:1rem;margin:12px 0 4px;color:var(--blue)}
.explain h3:first-child{margin-top:0}
.explain p{font-size:.93rem;line-height:1.6;color:#33415E}
.explain .teach{
  margin-top:12px;background:var(--green-soft);border-radius:10px;padding:12px 14px;
}
.explain .teach h3{color:var(--green);margin-top:0}
details.explain-toggle{margin-bottom:18px}
details.explain-toggle summary{
  cursor:pointer;font-weight:800;color:var(--blue);
  background:var(--paper);border:2px solid var(--blue-soft);border-radius:12px;
  padding:12px 16px;list-style:none;display:flex;align-items:center;gap:8px;
}
details.explain-toggle summary::-webkit-details-marker{display:none}
details.explain-toggle[open] summary{border-radius:12px 12px 0 0;border-bottom:none}
details.explain-toggle[open] .explain{border-radius:0 0 12px 12px;margin-bottom:0}

.linkbtn{color:var(--blue);font-weight:700;text-decoration:underline}

/* ---------- Landing ---------- */
.hero{text-align:center;padding:34px 8px 26px;max-width:640px;margin:0 auto}
.hero-badge{
  width:76px;height:76px;border-radius:20px;background:var(--blue);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:2.5rem;font-weight:800;
  margin:0 auto 18px;box-shadow:0 8px 24px rgba(43,89,195,.35);transform:rotate(-4deg);
}
.hero-title{font-size:1.9rem;line-height:1.15;letter-spacing:-.03em;margin-bottom:12px}
.hero-sub{color:var(--muted);font-size:1rem;line-height:1.6;max-width:52ch;margin:0 auto 20px}
.hero-cta{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-bottom:20px}
.btn-big{padding:14px 24px;font-size:1rem;border-radius:14px}
.stats-strip{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}
.feature-grid{
  display:grid;grid-template-columns:1fr;gap:12px;max-width:760px;margin:6px auto 24px;
}
@media(min-width:600px){.feature-grid{grid-template-columns:1fr 1fr}}
.feature{display:flex;gap:14px;align-items:flex-start;padding:16px}
.feature b{display:block;margin-bottom:4px;font-size:1rem}
.feature p{font-size:.88rem;color:var(--muted);line-height:1.55;margin:0}
.level-section{max-width:760px;margin:0 auto 24px;text-align:center}
.level-strip{
  display:flex;gap:6px;justify-content:center;align-items:center;flex-wrap:wrap;margin-top:12px;
}
.level-chip{
  background:var(--blue-soft);color:var(--blue);border-radius:999px;
  padding:6px 12px;font-weight:700;font-size:.8rem;white-space:nowrap;
}
.level-chip:last-child{background:var(--green-soft);color:var(--green)}
.level-arrow{color:var(--muted);font-weight:800}

/* ---------- Bibliotek ---------- */
.library-banner{margin-top:14px;border-color:#D9C77A;background:#FFFDF4}
.explain.article h3{margin-top:16px}
.explain.article p{margin-bottom:4px}

/* ---------- Didaktik-quiz ---------- */
.quiz-q{margin-bottom:14px}
.quiz-text{font-weight:700;font-size:.97rem;margin-bottom:12px}
.quiz-opts{display:flex;flex-direction:column;gap:8px;margin-bottom:12px}
.quiz-opt{
  text-align:left;padding:11px 14px;border:2px solid var(--grid);border-radius:12px;
  background:#FBFCFF;font-size:.92rem;font-weight:600;line-height:1.4;
  transition:border-color .12s;
}
.quiz-opt:hover:not(:disabled){border-color:var(--blue)}
.quiz-opt:disabled{cursor:default}
.quiz-opt.right{border-color:var(--green);background:var(--green-soft)}
.quiz-opt.wrong{border-color:var(--red);background:var(--red-soft)}
.quiz-opt.off{opacity:.55}

/* ---------- Profil ---------- */
.statgrid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:14px;
}
.statgrid div{
  background:#FBFCFF;border:1px solid var(--blue-soft);border-radius:12px;
  padding:10px 8px;text-align:center;
}
.statgrid b{display:block;font-size:1.05rem}
.statgrid span{font-size:.72rem;color:var(--muted);font-weight:600}
.boardrow{
  display:flex;align-items:center;gap:10px;padding:9px 10px;border-radius:10px;
  font-size:.95rem;
}
.boardrow.me{background:var(--blue-soft);font-weight:700}
.boardpos{font-weight:800;color:var(--muted);min-width:22px}

.duel{
  background:var(--paper);border:2px solid var(--yellow);border-radius:var(--radius);
  padding:12px 16px;font-weight:600;font-size:.92rem;margin-bottom:18px;box-shadow:var(--shadow);
}

.filterbar{display:flex;gap:8px;margin-bottom:16px;flex-wrap:wrap}
.chip{
  padding:7px 14px;border-radius:999px;font-weight:700;font-size:.83rem;
  background:var(--paper);border:2px solid var(--grid);color:var(--muted);
}
.chip.active{background:var(--ink);color:#fff;border-color:var(--ink)}

.toast{
  position:fixed;bottom:20px;left:50%;transform:translateX(-50%);
  background:var(--ink);color:#fff;padding:12px 22px;border-radius:999px;
  font-weight:800;box-shadow:0 6px 24px rgba(0,0,0,.25);z-index:100;
  animation:pop .25s ease;
}
@keyframes pop{from{transform:translateX(-50%) translateY(14px);opacity:0}to{transform:translateX(-50%) translateY(0);opacity:1}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}
.note{font-size:.82rem;color:var(--muted);margin-top:14px;line-height:1.5}

/* ---------- Matematik-chips ---------- */
code.m{
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  background:var(--blue-soft);color:var(--ink);
  border-radius:6px;padding:1px 7px;font-size:.94em;font-weight:600;
  white-space:nowrap;
}
.hintbox code.m,.explain .teach code.m{background:rgba(255,255,255,.75)}
.quiz-opt code.m{background:#EDF2FB}

/* ---------- Luftigere forklaringer ---------- */
.explain{padding:20px 18px}
.explain p{font-size:.95rem;line-height:1.8;margin-bottom:6px}
.explain h3{margin:18px 0 6px;padding-bottom:4px;border-bottom:2px solid var(--blue-soft)}
.explain h3:first-child{margin-top:0}
.explain .teach{padding:14px 16px;line-height:1.8}
.explain .teach h3{border-bottom-color:rgba(46,158,107,.25)}

/* ---------- Bund-tab-bar ---------- */
.tabbar{
  position:fixed;left:0;right:0;bottom:0;z-index:60;
  background:var(--paper);border-top:3px solid var(--blue);
  box-shadow:0 -2px 12px rgba(30,43,79,.10);
  display:flex;justify-content:center;gap:4px;
  padding:6px 8px calc(6px + env(safe-area-inset-bottom));
}
.tabbar[hidden]{display:none}
.tabbar button{
  flex:1;max-width:160px;min-height:48px;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;
  font-size:.72rem;font-weight:700;color:var(--muted);
  border-radius:12px;transition:background .12s,color .12s;
}
.tabbar button span{font-size:1.35rem;line-height:1}
.tabbar button.active{color:var(--blue);background:var(--blue-soft)}
body.has-tabbar main{padding-bottom:calc(96px + env(safe-area-inset-bottom))}

/* ---------- Kompakt header + touch-mål (mobil) ---------- */
header{padding-top:env(safe-area-inset-top)}
@media(max-width:520px){
  .hd-inner{padding:8px 12px;gap:8px}
  .logo{font-size:1.05rem}
  .logo .lg-badge{font-size:.95rem;padding:2px 7px}
  .pill{font-size:.78rem;padding:4px 10px}
}
.task-head{min-height:52px}
.chip{min-height:40px;display:inline-flex;align-items:center}
.quiz-opt{min-height:48px;display:flex;align-items:center}

/* ---------- Sticky filterbar ---------- */
.filterbar{
  position:sticky;top:56px;z-index:40;
  background:linear-gradient(#F7F9FC 85%,rgba(247,249,252,0));
  padding:8px 0 10px;margin-bottom:8px;
}
@media(min-width:521px){.filterbar{top:60px}}

/* ---------- Multiple choice på opgaver ---------- */
.mc-opts{margin:14px 0 12px}
.quiz-opt:disabled:not(.wrong):not(.right){opacity:.55}