/* Layout: zeszyt w kratkę — sticky top bar, centered 1080px column; arkusz mode = paper sheet on grid */
:root{
  --paper:#fbfcfe; --grid:#e3e9f3; --ink:#1b2a4a; --ink-soft:#4d5b78; --line:#d5dceb;
  --pen:#2448c9; --pen-soft:#e6ecfc; --red:#c8302c; --red-soft:#fbe9e8; --green:#1d7a46; --green-soft:#e3f3ea;
  --card:#ffffff; --hi:#fff3b8;
  --f-display:"Familjen Grotesk",system-ui,sans-serif;
  --f-text:"Literata",Georgia,serif;
  --f-mono:"JetBrains Mono",ui-monospace,monospace;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --paper:#111827; --grid:#1c2638; --ink:#e7ecf6; --ink-soft:#a3aec4; --line:#2c3850;
  --pen:#8ea6ff; --pen-soft:#1f2a4d; --red:#ff8a80; --red-soft:#3a1f22; --green:#6fd39b; --green-soft:#16302a;
  --card:#161f30; --hi:#4a4220; color-scheme:dark}}
:root[data-theme="dark"]{
  --paper:#111827; --grid:#1c2638; --ink:#e7ecf6; --ink-soft:#a3aec4; --line:#2c3850;
  --pen:#8ea6ff; --pen-soft:#1f2a4d; --red:#ff8a80; --red-soft:#3a1f22; --green:#6fd39b; --green-soft:#16302a;
  --card:#161f30; --hi:#4a4220; color-scheme:dark}
*{box-sizing:border-box}
body{background:var(--paper);color:var(--ink);font-family:var(--f-display);font-size:16px;line-height:1.5;
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:22px 22px}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:10;background:var(--card)}
a{color:var(--pen)}
button{font:inherit;cursor:pointer}
:focus-visible{outline:3px solid var(--pen);outline-offset:2px}
.wrap{max-width:1080px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.shell{display:grid;grid-template-columns:248px minmax(0,1fr);min-height:100vh}
aside.side{position:sticky;top:0;height:100vh;background:var(--card);border-right:1px solid var(--line);display:flex;flex-direction:column;gap:20px;padding:max(20px,env(safe-area-inset-top,0px)) 14px 20px max(14px,env(safe-area-inset-left,0px));overflow-y:auto}
.logo{font-weight:700;font-size:22px;letter-spacing:-.02em;text-decoration:none;color:var(--ink);display:flex;align-items:center;gap:8px;padding:0 8px}
.mark{width:34px;height:34px;flex:none;overflow:visible}
.mk-box{fill:none;stroke:var(--ink);stroke-width:2.5}
.mk-m{fill:none;stroke:var(--pen);stroke-width:3.4;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:140;stroke-dashoffset:0}
.mk-tick{fill:none;stroke:var(--red);stroke-width:3.4;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:20;stroke-dashoffset:0}
.wordmark em{font-style:normal;display:inline-block;color:var(--pen)}
@media (prefers-reduced-motion:no-preference){
  .mk-box{stroke-dasharray:140;animation:mkdraw 1s ease-out both}
  .mk-m{animation:mkdraw 1.1s .35s cubic-bezier(.6,0,.3,1) both}
  .mk-tick{animation:mktick .45s 1.35s ease-out both}
  .wordmark em{animation:mkbounce .6s 1.6s ease-out both}
  .logo:hover .mk-m{animation:mkdraw .9s cubic-bezier(.6,0,.3,1) both}
  .logo:hover .mk-tick{animation:mktick .4s .8s ease-out both}
  .logo:hover .wordmark em{animation:mkspin .7s .2s ease-in-out both}
}
@keyframes mkdraw{from{stroke-dashoffset:140}to{stroke-dashoffset:0}}
@keyframes mktick{from{stroke-dashoffset:20;opacity:0}to{stroke-dashoffset:0;opacity:1}}
@keyframes mkbounce{0%{transform:translateY(0)}40%{transform:translateY(-6px)}70%{transform:translateY(1px)}100%{transform:translateY(0)}}
@keyframes mkspin{to{transform:rotate(360deg)}}
.cke{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:12px}
.paper{padding:18px;display:grid;gap:10px;align-content:start}
.paper .yr{font-family:var(--f-mono);font-size:30px;font-weight:700;line-height:1}
.paper .links{display:flex;flex-wrap:wrap;gap:8px}
.segs{display:flex;gap:6px;flex-wrap:wrap}
.segs button{border:1.5px solid var(--line);background:var(--card);color:var(--ink-soft);border-radius:99px;padding:6px 14px}
.segs button.on{border-color:var(--ink);background:var(--ink);color:var(--paper)}
input.pts{width:90px;font:600 18px var(--f-mono);padding:8px 10px;border:1.5px solid var(--line);border-radius:8px;background:var(--paper);color:var(--ink)}
nav.main{display:grid;gap:2px}
nav.main a{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:8px;text-decoration:none;color:var(--ink-soft);font-weight:500}
nav.main a svg{width:20px;height:20px;flex:none;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
nav.main a:hover{background:var(--paper)}
nav.main a.on{background:var(--pen-soft);color:var(--pen);font-weight:600}
.side-subj{margin:0 8px;padding:10px 12px;border:1.5px solid var(--line);border-radius:8px;display:grid;gap:2px}
.side-foot{margin-top:auto;padding:12px;border-top:1px dashed var(--line);display:grid;gap:6px}
.side-foot .mono{font-size:24px;font-weight:700;color:var(--pen)}
.mtop{display:none}
main{padding-block:32px 64px}
h1,h2,h3{text-wrap:balance;line-height:1.15;margin:0}
h1{font-size:clamp(32px,5vw,52px);letter-spacing:-.025em;font-weight:700}
h2{font-size:28px;letter-spacing:-.015em}
h3{font-size:19px}
.lead{font-size:19px;color:var(--ink-soft);max-width:60ch}
.eyebrow{font-family:var(--f-mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-soft)}
.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 18px;border-radius:10px;border:2px solid var(--ink);background:var(--ink);color:var(--paper);font-weight:600;text-decoration:none}
.btn.ghost{background:transparent;color:var(--ink)}
.btn.small{padding:7px 12px;font-size:14px;border-width:1.5px}
.btn:disabled{opacity:.45;cursor:not-allowed}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.stack{display:grid;gap:16px}
.sheet{background:var(--card);border:1px solid var(--line);border-radius:4px;box-shadow:0 1px 0 var(--line),0 8px 24px -16px rgba(20,40,90,.25)}
.pill{display:inline-block;font-family:var(--f-mono);font-size:12px;padding:2px 8px;border-radius:99px;background:var(--pen-soft);color:var(--pen)}
.pill.red{background:var(--red-soft);color:var(--red)} .pill.green{background:var(--green-soft);color:var(--green)}
.muted{color:var(--ink-soft)}
.mono{font-family:var(--f-mono);font-variant-numeric:tabular-nums}

/* start */
.hero{display:grid;grid-template-columns:1.2fr 1fr;gap:40px;align-items:center;padding-block:16px 40px}
.hero > *{min-width:0}
.count{padding:24px}
.count .big{font-family:var(--f-mono);font-size:64px;font-weight:700;line-height:1;color:var(--pen)}
.count .scribble{color:var(--red);font-family:var(--f-text);font-style:italic}
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-block:8px 40px}
.feat{padding:20px;display:grid;gap:8px;align-content:start}
.feat .k{font-family:var(--f-mono);font-size:13px;color:var(--pen)}
.subjects{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:16px}
.subj{padding:16px;display:grid;gap:6px;text-decoration:none;color:var(--ink)}
.subj.soon{opacity:.6}
.bar{height:6px;border-radius:3px;background:var(--grid);overflow:hidden}
.bar i{display:block;height:100%;background:var(--pen)}
.concept{margin-top:48px;padding:24px;border-left:4px solid var(--red)}
.concept ul{margin:8px 0 0;padding-left:20px;display:grid;gap:4px}

/* tasks */
.bank{display:grid;grid-template-columns:240px 1fr;gap:24px;align-items:start}
.bank > *{min-width:0}
.filters{padding:16px;display:grid;gap:4px;position:sticky;top:24px}
.filters button{text-align:left;background:none;border:0;padding:7px 10px;border-radius:8px;color:var(--ink-soft);display:flex;justify-content:space-between;gap:8px}
.filters button.on{background:var(--pen-soft);color:var(--pen);font-weight:600}
.task{padding:22px 24px;display:grid;gap:14px}
.task .meta{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.task .num{font-family:var(--f-text);font-weight:600}
.q{font-family:var(--f-text);font-size:17px;line-height:1.6}
.opts{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}
.opt{display:flex;gap:10px;align-items:center;text-align:left;padding:10px 12px;border:1.5px solid var(--line);border-radius:8px;background:var(--card);color:var(--ink);font-family:var(--f-text);font-size:16px}
.opt .l{font-family:var(--f-mono);font-weight:700;width:26px;height:26px;display:grid;place-items:center;border:1.5px solid var(--ink-soft);border-radius:50%;flex:none;font-size:13px}
.opt.sel{border-color:var(--pen);background:var(--pen-soft)}
.opt.sel .l{background:var(--pen);color:var(--card);border-color:var(--pen)}
.opt.ok{border-color:var(--green);background:var(--green-soft)}
.opt.bad{border-color:var(--red);background:var(--red-soft)}
.modes{display:flex;border:1.5px solid var(--line);border-radius:10px;overflow:hidden;width:max-content;max-width:100%;flex-wrap:wrap}
.modes button{border:0;background:none;padding:7px 12px;font-size:14px;color:var(--ink-soft)}
.modes button.on{background:var(--ink);color:var(--paper)}
.hint{padding:12px 14px;border-radius:8px;background:var(--hi);font-family:var(--f-text)}
.steps{margin:0;padding-left:22px;display:grid;gap:8px;font-family:var(--f-text)}
.verdict{font-weight:600}
.verdict.ok{color:var(--green)} .verdict.bad{color:var(--red)}
textarea{width:100%;min-height:110px;font:16px/1.5 var(--f-text);padding:10px 12px;border:1.5px solid var(--line);border-radius:8px;background:var(--paper);color:var(--ink);resize:vertical}
.crit{display:grid;gap:6px}
.crit label{display:flex;gap:10px;align-items:flex-start;font-family:var(--f-text)}

/* exam */
.cover{max-width:760px;margin:0 auto;padding:32px}
.cover-head{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;border-bottom:2px solid var(--ink);padding-bottom:16px}
.boxes{display:flex;gap:3px}
.boxes span{width:22px;height:28px;border:1.5px solid var(--ink)}
.cover dl{display:grid;grid-template-columns:auto 1fr;gap:6px 16px;margin:20px 0}
.cover dt{color:var(--ink-soft)} .cover dd{margin:0;font-weight:600}
.cover ol{font-family:var(--f-text);display:grid;gap:6px;padding-left:22px}
.examgrid{display:grid;grid-template-columns:1fr 220px;gap:24px;align-items:start}
.examgrid > *{min-width:0}
.timerbar{position:sticky;top:calc(12px + env(safe-area-inset-top,0px));z-index:8;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:10px 16px;display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:16px}
.clock{font-family:var(--f-mono);font-size:26px;font-weight:700}
.clock.low{color:var(--red)}
.card-ans{padding:16px;position:sticky;top:96px;display:grid;gap:12px}
.cells{display:grid;grid-template-columns:repeat(5,1fr);gap:6px}
.cells a{display:grid;place-items:center;height:34px;border:1.5px solid var(--line);border-radius:6px;text-decoration:none;color:var(--ink-soft);font-family:var(--f-mono);font-size:13px}
.cells a.done{background:var(--pen);border-color:var(--pen);color:var(--card)}
.result{display:grid;grid-template-columns:auto 1fr;gap:32px;align-items:center;padding:28px}
.ring{width:150px;height:150px}
.topics{display:grid;gap:10px}
.topic{display:grid;grid-template-columns:1fr 120px 60px;gap:12px;align-items:center}

/* lesson */
.lesson{display:grid;grid-template-columns:260px 1fr;gap:24px;align-items:start}
.lesson > *{min-width:0}
.toc{padding:16px;display:grid;gap:4px;position:sticky;top:24px}
.toc a{padding:6px 10px;border-radius:6px;text-decoration:none;color:var(--ink-soft);font-size:15px}
.toc a.cur{background:var(--pen-soft);color:var(--pen);font-weight:600}
.prose{padding:28px;font-family:var(--f-text);font-size:17px;line-height:1.7}
.prose h2,.prose h3{font-family:var(--f-display);margin-top:24px;margin-bottom:8px}
.prose p{max-width:66ch}
.formula{font-family:var(--f-mono);font-size:20px;padding:14px 18px;border:1.5px dashed var(--pen);border-radius:8px;width:max-content;max-width:100%;overflow-x:auto;background:var(--pen-soft)}
.tip{border-left:3px solid var(--red);padding:8px 14px;background:var(--red-soft);border-radius:0 8px 8px 0}

/* progress */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.stat{padding:16px}
.stat .v{font-family:var(--f-mono);font-size:30px;font-weight:700}
table.hist{width:100%;border-collapse:collapse;font-variant-numeric:tabular-nums}
table.hist td,table.hist th{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line)}
.empty{padding:24px;text-align:center;color:var(--ink-soft)}

@media (max-width:860px){
  .shell{display:block}
  aside.side{position:fixed;top:auto;bottom:0;left:0;right:0;height:auto;z-index:20;flex-direction:row;padding:6px max(8px,env(safe-area-inset-right,0px)) calc(6px + env(safe-area-inset-bottom,0px)) max(8px,env(safe-area-inset-left,0px));border-right:0;border-top:1px solid var(--line);overflow:visible}
  aside.side .logo,.side-subj,.side-foot{display:none}
  nav.main{grid-template-columns:repeat(6,1fr);width:100%}
  nav.main a{flex-direction:column;gap:2px;padding:6px 2px;font-size:11px;text-align:center}
  .mtop{display:flex;align-items:center;justify-content:space-between;gap:12px;position:sticky;top:env(safe-area-inset-top,0px);z-index:9;background:var(--card);border-bottom:1px solid var(--line);padding:10px max(16px,env(safe-area-inset-right,0px)) 10px max(16px,env(safe-area-inset-left,0px))}
  main{padding-bottom:110px}
  .timerbar{top:calc(56px + env(safe-area-inset-top,0px))}
  .hero,.bank,.examgrid,.lesson{grid-template-columns:1fr}
  .features{grid-template-columns:1fr}
  .subjects,.stats{grid-template-columns:repeat(2,1fr)}
  .filters,.toc,.card-ans{position:static}
  .filters{display:flex;flex-wrap:wrap}
  .result{grid-template-columns:1fr;justify-items:center}
  .topic{grid-template-columns:1fr 80px 50px}
}
@media (max-width:520px){.opts{grid-template-columns:1fr}.count .big{font-size:48px}}
@media (prefers-reduced-motion:no-preference){.opt,.btn{transition:background .15s,border-color .15s}}

/* ---------- konto, profil, podgląd PDF (wtyczka WP) ---------- */
html,body{min-height:100%}
.userchip{margin:0 8px;display:flex;gap:10px;align-items:center;padding:10px;border-radius:10px;border:1.5px solid var(--line);text-decoration:none;color:var(--ink)}
.userchip:hover{border-color:var(--pen)}
.userchip span:last-child{display:grid;min-width:0}
.userchip .muted{font-size:13px}
.avatar{width:36px;height:36px;border-radius:50%;background:var(--pen);color:var(--card);display:grid;place-items:center;font-family:var(--f-mono);font-weight:700;font-size:14px;flex:none}
.avatar.ghost{background:var(--grid);color:var(--ink-soft)}
.avatar.big{width:72px;height:72px;font-size:26px}
.authgrid{display:grid;grid-template-columns:minmax(0,440px) minmax(0,1fr);gap:40px;align-items:start}
.authcard{padding:28px;display:grid;gap:18px}
.authside{padding-top:24px}
.ticks{margin:0;padding-left:20px;display:grid;gap:8px;font-family:var(--f-text)}
.field{display:grid;gap:6px}
.field label,.field .lab{font-weight:600;font-size:15px}
.field input:not([type=checkbox]):not([type=radio]):not([type=range]),.field select{font:16px var(--f-display);padding:10px 12px;border:1.5px solid var(--line);border-radius:8px;background:var(--paper);color:var(--ink);width:100%}
.field input:focus,.field select:focus{border-color:var(--pen);outline:none;box-shadow:0 0 0 3px var(--pen-soft)}
input[type=range]{accent-color:var(--pen);width:100%}
.check,.radio{display:flex;gap:8px;align-items:center}
.hp{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}
.formmsg{margin:0;color:var(--red);min-height:1.5em}
.formmsg.ok{color:var(--green)}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{display:flex;gap:6px;align-items:center;border:1.5px solid var(--line);border-radius:99px;padding:5px 12px;font-size:14px}
.chip:has(input:checked){border-color:var(--pen);background:var(--pen-soft);color:var(--pen)}
.profilehead{padding:24px;display:flex;gap:20px;align-items:center;flex-wrap:wrap}
.profgrid{display:grid;grid-template-columns:1.3fr 1fr;gap:16px;margin-top:16px;align-items:start}
.profgrid > *{min-width:0}
.viewerbar{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:12px}
.pdfwrap{background:var(--card);border:1px solid var(--line);border-radius:6px;overflow:hidden;min-width:0}
iframe.pdf{display:block;width:100%;height:calc(100vh - 140px);min-height:520px;border:0;background:#fff}
.split{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:16px;align-items:start}
.split.nopdf{grid-template-columns:minmax(0,1fr) 320px}
.split iframe.pdf{height:calc(100vh - 64px)}
.examside{padding:20px;display:grid;gap:12px;position:sticky;top:24px}
.examside .clock{font-size:40px}
@media (max-width:860px){
  .nav-profile,.userchip{display:none!important}
  .authgrid,.profgrid,.split,.split.nopdf{grid-template-columns:1fr}
  .examside{position:sticky;top:calc(56px + env(safe-area-inset-top,0px));z-index:5;order:-1}
  .examside p,.examside textarea,.examside label{display:none}
  .examside .clock{font-size:28px}
  iframe.pdf,.split iframe.pdf{height:75vh;min-height:420px}
}
a.pill{text-decoration:none}
.pdfwrap{height:calc(100vh - 140px);min-height:520px;overflow:auto;-webkit-overflow-scrolling:touch}
.split .pdfwrap{height:calc(100vh - 64px)}
.pdfwrap.pages{background:var(--grid);display:grid;justify-items:center;align-content:start;gap:12px;padding:12px}
.pdfwrap canvas{background:#fff;box-shadow:0 2px 10px rgba(0,0,0,.15);max-width:100%;height:auto}
.pdfmsg{padding:24px;color:var(--ink-soft)}
@media (max-width:860px){.pdfwrap,.split .pdfwrap{height:75vh;min-height:420px}}