/* ===========================================================
   Endimensionell analys B1 (FMAB65) — stil
   Estetik: ljust "rutpapper", indigo accent, serif-rubriker.
   Fristående kurs-app (SPA). Delar inget CSS med andra kurser.
   =========================================================== */
:root{
  --paper:    #f6f7fb;
  --paper-2:  #eef0f8;
  --card:     #ffffff;
  --ink:      #161a2b;
  --ink-2:    #4a4f63;
  --ink-3:    #868ba1;
  --line:     #e3e6f0;
  --line-2:   #d2d7e8;
  --indigo:   #4f46e5;
  --indigo-2: #6366f1;
  --indigo-deep:#3730a3;
  --green:    #15935b;
  --amber:    #c8860a;
  --red:      #d4453b;
  --shadow:   0 12px 34px rgba(31,29,90,.10);
  --shadow-sm:0 2px 10px rgba(31,29,90,.07);
  --display:"Fraunces",Georgia,serif;
  --body:"Hanken Grotesk",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --maxw:1000px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;color:var(--ink);font-family:var(--body);line-height:1.55;
  -webkit-font-smoothing:antialiased;background:var(--paper);min-height:100vh;
  background-image:
    linear-gradient(rgba(79,70,229,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79,70,229,.05) 1px, transparent 1px);
  background-size:26px 26px;
}
.wrap{max-width:var(--maxw);margin:0 auto;padding:1.6rem 1.4rem 3rem}

/* ---------- header ---------- */
.topbar{background:var(--card);border-bottom:1px solid var(--line);
  display:grid;grid-template-columns:1fr auto;align-items:center;gap:.8rem 1.2rem;
  padding:.9rem 1.4rem;box-shadow:var(--shadow-sm);position:sticky;top:0;z-index:20}
.brand{display:flex;align-items:center;gap:.85rem;min-width:0}
.glyph{flex:none;width:46px;height:46px;border-radius:12px;background:var(--indigo);
  color:#fff;display:grid;place-items:center;font-family:var(--display);font-size:1.9rem;line-height:1;
  box-shadow:0 5px 14px rgba(79,70,229,.35)}
.brand h1{font-family:var(--display);font-weight:900;font-size:1.32rem;margin:0;letter-spacing:-.01em;line-height:1.05}
.brand .sub{margin:.1rem 0 0;font-size:.78rem;color:var(--ink-3);font-weight:600}
.top-right{display:flex;align-items:center;gap:.9rem;justify-self:end}
.hub-back{font-size:.8rem;font-weight:700;color:var(--indigo-deep);text-decoration:none;white-space:nowrap;
  background:rgba(79,70,229,.09);border:1px solid rgba(79,70,229,.38);
  padding:.34rem .8rem;border-radius:999px;transition:.16s}
.hub-back:hover{background:rgba(79,70,229,.17);text-decoration:none}
.tabs{grid-column:1/-1;display:flex;gap:.3rem;flex-wrap:wrap}
.tab{font-family:var(--body);font-weight:700;font-size:.9rem;color:var(--ink-2);
  background:transparent;border:1px solid transparent;border-radius:9px;padding:.42rem .85rem;cursor:pointer;transition:.14s}
.tab:hover{background:var(--paper-2)}
.tab.active{background:var(--indigo);color:#fff}
.nav-toggle{display:none;justify-self:end;background:var(--paper-2);border:1px solid var(--line-2);
  border-radius:9px;width:40px;height:38px;font-size:1.2rem;line-height:1;color:var(--ink);cursor:pointer}
.nav-toggle:hover{background:var(--paper)}

/* ---------- account widget ---------- */
.kb-account{font-size:.8rem;position:relative}
.kb-acc-why{position:absolute;top:calc(100% + 6px);right:0;z-index:30;
  font-size:.66rem;line-height:1.35;color:var(--ink-2);background:var(--paper-2);
  border:1px solid var(--line);border-radius:8px;padding:.4rem .55rem;width:230px;text-align:left;
  box-shadow:0 6px 20px rgba(0,0,0,.08)}
.kb-acc-why b{color:var(--ink)}
.kb-acc-note{color:var(--ink-3);font-weight:600}
.kb-acc-note.err{color:var(--red)}
.kb-acc-email{color:var(--ink-2);font-weight:600;margin-right:.4rem}
.kb-acc-form{display:flex;gap:.3rem}
.kb-acc-form input{font-family:var(--body);font-size:.8rem;padding:.32rem .5rem;border:1px solid var(--line-2);border-radius:8px;width:130px}
.kb-acc-btn{font-family:var(--body);font-weight:700;font-size:.78rem;color:#fff;background:var(--indigo);
  border:none;border-radius:8px;padding:.34rem .6rem;cursor:pointer}
.kb-acc-btn:hover{background:var(--indigo-deep)}

/* ---------- views ---------- */
.view{display:none;animation:fade .25s ease}
.view.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.lead{font-size:1.04rem;color:var(--ink-2);max-width:64ch}
.hint{font-size:.84rem;color:var(--ink-3)}
.hint.partial{background:#fff7e6;border:1px solid #f0dca8;color:#7a5a12;padding:.5rem .8rem;border-radius:10px;display:inline-block}

/* ---------- översikt (flytande dokument + sidebar) ---------- */
.ov-layout{display:grid;grid-template-columns:230px 1fr;gap:2.2rem;max-width:1140px;margin:0 auto;
  padding:0 1.4rem;align-items:start}
.ov-toc{position:sticky;top:122px;align-self:start;max-height:calc(100vh - 140px);overflow:auto;
  border-right:1px solid var(--line);padding:.3rem 1rem .8rem 0}
#ov-nav{display:flex;flex-direction:column;gap:.05rem}
#ov-nav a{font-size:.84rem;font-weight:600;color:var(--ink-2);text-decoration:none;padding:.4rem .55rem;
  border-radius:8px;border-left:2px solid transparent;line-height:1.25;transition:.13s}
#ov-nav a:hover{background:var(--paper-2);color:var(--indigo-deep)}
#ov-nav a.active{background:#eef0ff;color:var(--indigo-deep);border-left-color:var(--indigo);font-weight:700}
.ov-doc{min-width:0;padding:.2rem 0 3rem}
.ov-doc .lead{margin-bottom:1.3rem}
.ov-grid{display:flex;flex-direction:column;gap:0}
.ov-sec{padding:1.5rem 0;border-bottom:1px solid var(--line);scroll-margin-top:120px}
.ov-sec:first-child{padding-top:.2rem}
.ov-sec:last-child{border-bottom:none}
.ov-sec h3{font-family:var(--display);font-weight:800;font-size:1.5rem;margin:0 0 .6rem;letter-spacing:-.01em}
.ov-body{color:var(--ink-2);font-size:1rem;line-height:1.75;max-width:68ch}
.ov-body p{margin:.55rem 0}
.ov-body strong{color:var(--ink)}
.ov-body em{font-style:italic;color:var(--ink)}
@media (max-width:720px){
  .ov-layout{grid-template-columns:1fr;gap:0}
  .ov-toc{position:relative;top:0;max-height:none;overflow:visible;border-right:none;
    border-bottom:1px solid var(--line);padding:.5rem 0 .7rem;margin-bottom:.8rem}
  #ov-nav{flex-direction:row;flex-wrap:wrap;gap:.3rem}
  #ov-nav a{border-left:none;border:1px solid var(--line-2);font-size:.78rem;padding:.3rem .55rem}
  #ov-nav a.active{border-color:var(--indigo)}
  .nav-g{flex-basis:100%;border-top:none;margin-top:.3rem;padding:.2rem 0 .1rem}
  .nav-g:first-child{margin-top:0}
}
.ov-refs{display:flex;align-items:baseline;gap:.4rem .45rem;flex-wrap:wrap;margin-top:.85rem;
  padding-top:.75rem;border-top:1px dashed var(--line-2)}
.ov-refs-l{font-size:.72rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--ink-3)}
.fref{font-family:var(--body);font-size:.78rem;font-weight:700;color:var(--indigo-deep);
  background:var(--paper-2);border:1px solid var(--line-2);border-radius:999px;padding:.24rem .65rem;
  cursor:pointer;transition:.14s}
.fref:hover{background:var(--indigo);color:#fff;border-color:var(--indigo)}
.ov-videos{margin-top:.85rem;padding-top:.75rem;border-top:1px dashed var(--line-2)}
.ov-videos > summary{display:flex;align-items:center;gap:.5rem;margin:0;cursor:pointer;list-style:none;
  font-size:.72rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--ink-3);user-select:none}
.ov-videos > summary::-webkit-details-marker{display:none}
.ov-videos > summary::after{content:"▾";font-size:.85rem;color:var(--ink-3);transition:transform .15s}
.ov-videos[open] > summary::after{transform:rotate(180deg)}
.ov-videos > summary:hover{color:var(--indigo-deep)}
.ov-vid-ic{flex:none;display:grid;place-items:center;width:1.15rem;height:1.15rem;border-radius:4px;
  background:#c4302b;color:#fff;font-size:.5rem;padding-left:.06rem}
.ov-vid-n{margin-left:auto;font-weight:700;color:var(--ink-2);background:var(--paper-2);
  border:1px solid var(--line-2);border-radius:999px;padding:.06rem .55rem;text-transform:none;letter-spacing:0}
.vbtns{display:grid;grid-template-columns:repeat(auto-fill,minmax(248px,1fr));gap:.4rem;margin-top:.65rem;align-items:start}
.vbtn{display:flex;align-items:center;gap:.6rem;min-width:0;max-width:100%;font-family:var(--body);font-size:.86rem;font-weight:600;
  color:var(--ink);background:var(--paper-2);border:1px solid var(--line-2);border-radius:9px;padding:.42rem .7rem;
  text-decoration:none;transition:.14s}
.vbtn:hover{border-color:#c4302b;color:#c4302b;background:#fff}
.vbtn .vplay{flex:none;width:1.45rem;height:1.45rem;display:grid;place-items:center;border-radius:6px;
  background:#c4302b;color:#fff;font-size:.6rem;padding-left:.08rem}
.vbtn .vtxt{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* ---------- studieguide ---------- */
#sg-body{display:flex;flex-direction:column;gap:1.3rem;margin-top:1.3rem;max-width:80ch}
.sg-theme{background:var(--card);border:1px solid var(--line);border-radius:14px;
  padding:1.1rem 1.3rem 1.3rem;box-shadow:var(--shadow-sm);scroll-margin-top:120px}
.sg-head{display:flex;align-items:center;gap:.85rem;margin-bottom:.5rem}
.sg-num{flex:none;width:2rem;height:2rem;border-radius:50%;background:var(--indigo);color:#fff;
  display:grid;place-items:center;font-family:var(--display);font-weight:800;font-size:1rem}
.sg-head h3{font-family:var(--display);font-weight:800;font-size:1.32rem;margin:0;line-height:1.1;letter-spacing:-.01em}
.sg-instud{font-size:.72rem;font-weight:700;letter-spacing:.03em;text-transform:uppercase;color:var(--ink-3)}
.sg-text{color:var(--ink-2);font-size:.96rem;line-height:1.72}
.sg-text h4{font-family:var(--display);font-weight:700;font-size:1.05rem;color:var(--ink);margin:1.15rem 0 .3rem}
.sg-text h4:first-child{margin-top:.2rem}
.sg-text p{margin:.4rem 0}
.sg-text strong{color:var(--ink)} .sg-text em{font-style:italic;color:var(--ink)}
.sg-method{margin-top:1rem;background:#f3f7ff;border:1px solid #d6e2fb;border-left:4px solid var(--indigo);
  border-radius:11px;padding:.85rem 1.1rem}
.sg-method-l{display:block;font-family:var(--display);font-weight:800;font-size:.95rem;color:var(--indigo-deep);margin-bottom:.35rem}
.sg-method p{margin:.15rem 0 .4rem;font-size:.92rem;color:var(--ink-2)}
.sg-method ol{margin:.3rem 0 0;padding-left:1.2rem;color:var(--ink-2);font-size:.92rem;line-height:1.6}
.sg-method li{margin:.4rem 0}
.sg-method strong{color:var(--ink)}

/* ---------- guide: band-rubriker + TOC-grupper ---------- */
.guide-band{margin:.4rem 0 .2rem}
.guide-band.depth{margin-top:2.6rem;padding-top:1.6rem;border-top:2px solid var(--line)}
.guide-band-l{display:inline-block;font-family:var(--display);font-weight:800;font-size:.8rem;
  letter-spacing:.1em;text-transform:uppercase;color:var(--indigo-deep);
  background:#eef0ff;border:1px solid #dfe3ff;border-radius:999px;padding:.32rem .9rem}
.guide-band-sub{margin:.75rem 0 0;font-size:.95rem;line-height:1.65;color:var(--ink-2);max-width:66ch}
#guide-depth{margin-top:.4rem}
#guide-depth .sg-theme{margin-bottom:1.3rem}
.nav-g{font-size:.68rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-3);
  padding:.5rem .55rem .25rem;margin-top:.6rem;border-top:1px solid var(--line)}
.nav-g:first-child{border-top:none;margin-top:0;padding-top:.1rem}
/* markeringspuls vid hopp från en övning */
.ov-sec.flash,.sg-theme.flash{animation:gflash 1.6s ease;border-radius:12px}
@keyframes gflash{0%,100%{box-shadow:0 0 0 0 rgba(79,70,229,0)}25%{box-shadow:0 0 0 3px rgba(79,70,229,.55)}}

/* ---------- guide → öva-länk (tentauppgifter per ämne) ---------- */
.ov-practice{display:flex;align-items:baseline;gap:.4rem .5rem;flex-wrap:wrap;margin-top:.85rem;
  padding-top:.75rem;border-top:1px dashed var(--line-2)}
.ov-practice-l{font-size:.72rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--ink-3)}
.gpractice{font-family:var(--body);font-size:.78rem;font-weight:700;color:var(--green-deep,#1b7a47);
  background:#eafaf0;border:1px solid #c2ebd3;border-radius:999px;padding:.24rem .7rem;cursor:pointer;transition:.14s}
.gpractice:hover{background:var(--green,#1e9e5a);color:#fff;border-color:var(--green,#1e9e5a)}

/* ---------- "Läs på"-knapp ovanför varje övning ---------- */
.p-guide-row{margin:0 0 .7rem}
.p-guide{font-family:var(--body);font-weight:700;font-size:.8rem;color:var(--indigo-deep);
  background:#eef0ff;border:1px solid #dfe3ff;border-radius:9px;padding:.4rem .72rem;cursor:pointer;
  display:inline-flex;align-items:center;gap:.4rem;transition:.14s}
.p-guide:hover{background:var(--indigo);color:#fff;border-color:var(--indigo)}

/* ---------- öva (metodkategorier + tentauppgifter) ---------- */
.practice-layout{display:grid;grid-template-columns:250px 1fr;gap:2.2rem;max-width:1160px;margin:0 auto;
  padding:0 1.4rem;align-items:start}
.practice-toc{position:sticky;top:122px;align-self:start;max-height:calc(100vh - 140px);overflow:auto;
  border-right:1px solid var(--line);padding:.3rem 1rem .8rem 0}
#practice-nav{display:flex;flex-direction:column;gap:.08rem}
#practice-nav a{display:grid;grid-template-columns:1fr auto;gap:.55rem;align-items:start;font-size:.82rem;
  font-weight:650;color:var(--ink-2);text-decoration:none;padding:.42rem .55rem;border-radius:8px;
  border-left:2px solid transparent;line-height:1.24;transition:.13s}
#practice-nav a:hover{background:var(--paper-2);color:var(--indigo-deep)}
#practice-nav a.active{background:#eef0ff;color:var(--indigo-deep);border-left-color:var(--indigo);font-weight:750}
#practice-nav b{font-size:.72rem;color:var(--ink-3);font-weight:800}
.practice-doc{min-width:0;padding:.2rem 0 3rem}
.practice-doc .lead{margin-bottom:1.3rem}
.practice-cat{padding:1.6rem 0 2rem;border-bottom:1px solid var(--line);scroll-margin-top:120px}
.practice-cat:first-of-type{padding-top:.2rem}
.practice-cat:last-child{border-bottom:none}
.practice-head{display:flex;align-items:flex-start;gap:.85rem;margin-bottom:1.1rem}
.practice-num{flex:none;width:2.15rem;height:2.15rem;border-radius:50%;background:var(--indigo);color:#fff;
  display:grid;place-items:center;font-family:var(--display);font-weight:800;font-size:1.02rem}
.practice-head h2{font-family:var(--display);font-weight:900;font-size:1.55rem;line-height:1.1;margin:0;letter-spacing:-.01em}
.practice-head p{margin:.16rem 0 0;font-size:.8rem;color:var(--ink-3);font-weight:700}
.practice-block{max-width:76ch;margin:1rem 0 0;color:var(--ink-2);font-size:.97rem;line-height:1.7}
.practice-block h3{font-family:var(--display);font-weight:800;font-size:1.08rem;color:var(--ink);margin:0 0 .35rem}
.practice-block p{margin:.38rem 0}
.practice-block ul,.practice-block ol{margin:.35rem 0 0;padding-left:1.25rem}
.practice-block li{margin:.36rem 0}
.practice-block.checklist,.practice-block.method{background:#f3f7ff;border:1px solid #d6e2fb;border-left:4px solid var(--indigo);
  border-radius:11px;padding:.85rem 1.05rem}
.practice-problems{margin-top:.75rem}
.practice-problems .problem{max-width:none}
.p-source{font-size:.76rem;color:var(--ink-3);font-weight:700;margin:.45rem 0 0}

@media (max-width:760px){
  .practice-layout{grid-template-columns:1fr;gap:0}
  .practice-toc{position:relative;top:0;max-height:none;overflow:visible;border-right:none;
    border-bottom:1px solid var(--line);padding:.5rem 0 .7rem;margin-bottom:.8rem}
  #practice-nav{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:.35rem}
  #practice-nav a{border-left:none;border:1px solid var(--line-2);font-size:.78rem;padding:.4rem .55rem}
  #practice-nav a.active{border-color:var(--indigo)}
  .practice-head h2{font-size:1.32rem}
}

/* ---------- formelblad (sida + kategori-sidebar) ---------- */
.f-layout{display:grid;grid-template-columns:230px 1fr;gap:2.2rem;max-width:1140px;margin:0 auto;
  padding:0 1.4rem;align-items:start}
.f-toc{position:sticky;top:122px;align-self:start;max-height:calc(100vh - 140px);overflow:auto;
  border-right:1px solid var(--line);padding:.3rem 1rem .8rem 0}
#f-search{width:100%;font-family:var(--body);font-size:.9rem;padding:.5rem .7rem;border:1px solid var(--line-2);
  border-radius:10px;background:var(--card);margin-bottom:.85rem}
#f-nav{display:flex;flex-direction:column;gap:.05rem}
#f-nav a{font-size:.82rem;font-weight:600;color:var(--ink-2);text-decoration:none;padding:.38rem .55rem;
  border-radius:8px;border-left:2px solid transparent;line-height:1.2;transition:.13s}
#f-nav a:hover{background:var(--paper-2);color:var(--indigo-deep)}
#f-nav a.active{background:#eef0ff;color:var(--indigo-deep);border-left-color:var(--indigo);font-weight:700}
#f-nav a.hide{display:none}
.f-doc{min-width:0;padding-bottom:3rem}
.f-doc .hint{margin:.2rem 0 1.3rem}
.f-cat-sec{scroll-margin-top:120px;margin-bottom:1.7rem}
.f-cat-sec h3{font-family:var(--display);font-weight:800;font-size:1.4rem;margin:0 0 .7rem;letter-spacing:-.01em;
  padding-bottom:.35rem;border-bottom:2px solid var(--line)}
.frow{background:var(--card);border:1px solid var(--line);border-left:4px solid var(--indigo);border-radius:12px;
  padding:.9rem 1.15rem;margin-bottom:.7rem;box-shadow:var(--shadow-sm);scroll-margin-top:120px}
.frow h4{font-family:var(--display);font-weight:700;font-size:1.05rem;margin:0 0 .1rem}
.frow .formula{font-size:1.04rem;overflow-x:auto;overflow-y:hidden;padding:.1rem 0 .3rem}
.frow .formula::-webkit-scrollbar{height:6px}
.frow .formula::-webkit-scrollbar-thumb{background:var(--line-2);border-radius:99px}
.frow .formula .katex-display{margin:.35rem 0}
.frow .fnote{font-size:.9rem;color:var(--ink-2);margin:.15rem 0 0}
.frow .fsrc{font-size:.72rem;color:var(--ink-3);margin-top:.5rem;font-style:italic}
.frow .fproof{margin-top:.55rem;border-top:1px dashed var(--line-2);padding-top:.5rem}
.frow .fproof>summary{font-size:.78rem;font-weight:700;color:var(--indigo-deep);cursor:pointer;
  list-style:none;display:inline-flex;align-items:center;gap:.35rem}
.frow .fproof>summary::-webkit-details-marker{display:none}
.frow .fproof>summary::before{content:"▸";font-size:.7rem;transition:transform .15s}
.frow .fproof[open]>summary::before{transform:rotate(90deg)}
.frow .fproof-body{font-size:.86rem;color:var(--ink-2);line-height:1.6;margin-top:.45rem;
  overflow-x:auto;overflow-y:hidden}
.frow .fproof-body .katex-display{margin:.4rem 0}
.frow.flash{animation:flash 1.6s ease}
@keyframes flash{0%,100%{box-shadow:var(--shadow-sm)}
  15%{box-shadow:0 0 0 3px var(--indigo-2),var(--shadow)}
  50%{box-shadow:0 0 0 3px var(--indigo-2),var(--shadow)}}
@media (max-width:720px){
  .f-layout{grid-template-columns:1fr;gap:0}
  .f-toc{position:relative;top:0;max-height:none;overflow:visible;border-right:none;
    border-bottom:1px solid var(--line);padding:.5rem 0 .7rem;margin-bottom:.8rem}
  #f-nav{flex-direction:row;flex-wrap:wrap;gap:.3rem}
  #f-nav a{border-left:none;border:1px solid var(--line-2);font-size:.78rem;padding:.3rem .55rem}
  #f-nav a.active{border-color:var(--indigo)}
}

/* ---------- tentor ---------- */
.exam-list{display:grid;gap:.8rem}
.exam-row{display:flex;align-items:center;justify-content:space-between;gap:1rem;background:var(--card);
  border:1px solid var(--line);border-radius:13px;padding:1rem 1.15rem;box-shadow:var(--shadow-sm);cursor:pointer;transition:.15s}
.exam-row:hover{border-color:var(--indigo-2);transform:translateY(-2px);box-shadow:var(--shadow)}
.exam-row h3{font-family:var(--display);font-weight:700;font-size:1.12rem;margin:0}
.exam-row .meta{font-size:.8rem;color:var(--ink-3);margin-top:.2rem}
.exam-row .prog{font-size:.8rem;font-weight:700;color:var(--ink-2);white-space:nowrap}
.bar{height:7px;width:120px;background:var(--paper-2);border-radius:99px;overflow:hidden;margin-top:.35rem}
.bar > i{display:block;height:100%;background:var(--green)}

.exam-detail .back{background:none;border:none;color:var(--indigo-deep);font-weight:700;font-size:.85rem;cursor:pointer;padding:.2rem 0;margin-bottom:.6rem}
.exam-head{display:flex;justify-content:space-between;align-items:flex-start;gap:1rem;flex-wrap:wrap;margin-bottom:.4rem}
.exam-head h2{font-family:var(--display);font-weight:900;font-size:1.5rem;margin:0}
.exam-head .links a{font-size:.8rem;font-weight:700;color:var(--indigo-deep);margin-left:.8rem}
.exam-info{font-size:.85rem;color:var(--ink-2);background:var(--paper-2);border-radius:10px;padding:.6rem .85rem;margin:.5rem 0 1.1rem}
.part-label{font-family:var(--display);font-weight:700;font-size:.95rem;color:var(--ink-3);margin:1.3rem 0 .5rem;
  text-transform:uppercase;letter-spacing:.08em}

.problem{background:var(--card);border:1px solid var(--line);border-radius:13px;padding:1rem 1.15rem;margin-bottom:.75rem;box-shadow:var(--shadow-sm)}
.problem.done-ratt{border-left:4px solid var(--green)}
.problem.done-delvis{border-left:4px solid var(--amber)}
.problem.done-fel{border-left:4px solid var(--red)}
.p-top{display:flex;justify-content:space-between;align-items:center;gap:.7rem;margin-bottom:.5rem}
.p-num{font-family:var(--display);font-weight:900;font-size:1.15rem;color:var(--indigo);display:flex;align-items:center;gap:.55rem;flex-wrap:wrap;line-height:1.2}
.p-tag{font-size:.7rem;font-weight:700;color:var(--ink-3);background:var(--paper-2);padding:.18rem .5rem;border-radius:99px}
.p-statement{font-size:.96rem;color:var(--ink);line-height:1.7;overflow-x:auto;overflow-y:hidden}
.p-statement::-webkit-scrollbar,.answer::-webkit-scrollbar{height:6px}
.p-statement::-webkit-scrollbar-thumb,.answer::-webkit-scrollbar-thumb{background:var(--line-2);border-radius:99px}
.p-actions{margin-top:.8rem;display:flex;gap:.5rem;flex-wrap:wrap}
.btn{font-family:var(--body);font-weight:700;font-size:.83rem;border-radius:9px;padding:.42rem .8rem;cursor:pointer;border:1px solid var(--line-2);background:var(--card);color:var(--ink-2);transition:.14s}
.btn:hover{border-color:var(--indigo-2);color:var(--indigo-deep)}
.btn.primary{background:var(--indigo);color:#fff;border-color:var(--indigo)}
.btn.primary:hover{background:var(--indigo-deep)}
.answer{margin-top:.75rem;padding:.75rem .9rem;background:#f3f7ff;border:1px solid #d6e2fb;border-radius:10px;font-size:.95rem;line-height:1.7;overflow-x:auto;overflow-y:hidden}
.answer .a-label{display:block;font-size:.7rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--indigo-deep);margin-bottom:.4rem}
.answer .svar-note{font-size:.78rem;color:var(--ink-3);margin-top:.5rem}
.selfgrade{margin-top:.7rem;display:flex;gap:.4rem;align-items:center;flex-wrap:wrap}
.selfgrade .sg-q{font-size:.8rem;color:var(--ink-2);font-weight:600;margin-right:.2rem}
.sg{font-size:.8rem;font-weight:700;border-radius:8px;padding:.34rem .7rem;cursor:pointer;border:1px solid var(--line-2);background:var(--card)}
.sg.ratt{color:var(--green)} .sg.ratt.sel{background:var(--green);color:#fff;border-color:var(--green)}
.sg.delvis{color:var(--amber)} .sg.delvis.sel{background:var(--amber);color:#fff;border-color:var(--amber)}
.sg.fel{color:var(--red)} .sg.fel.sel{background:var(--red);color:#fff;border-color:var(--red)}

.hidden{display:none}
.footnote{text-align:center;font-size:.78rem;color:var(--ink-3);padding:1.5rem 1.4rem 2.5rem;border-top:1px solid var(--line)}

@media (max-width:640px){
  .topbar{grid-template-columns:1fr auto;row-gap:.7rem}
  .brand{grid-column:1;grid-row:1}
  .nav-toggle{display:inline-flex;align-items:center;justify-content:center;grid-column:2;grid-row:1}
  .top-right{grid-column:1/-1;grid-row:2;justify-self:start;display:none}
  .tabs{grid-column:1/-1;grid-row:3;display:none}
  .topbar.nav-open .top-right{display:flex;flex-wrap:wrap}
  .topbar.nav-open .tabs{display:flex}
  .kb-acc-why{position:static;width:auto;max-width:none;box-shadow:none;margin-top:.4rem}
}