:root{
  --bg:#0f141b; --panel:#171e28; --panel2:#1f2835; --line:#2c3746;
  --txt:#e9eef6; --dim:#9aa8bd; --faint:#67758c;
  --acc:#4cc2ff; --ok:#3ddc97; --warn:#ffc857; --bad:#ff6b6b;
  --mono:ui-monospace,Menlo,Consolas,"Liberation Mono",monospace;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{background:var(--bg);color:var(--txt);
  font:15px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;-webkit-font-smoothing:antialiased}
a{color:var(--acc)}
button{font:inherit;cursor:pointer;border:none;border-radius:9px;padding:10px 16px;
  background:var(--acc);color:#0f141b;font-weight:600}
button:hover{filter:brightness(1.08)}
button:disabled{opacity:.45;cursor:not-allowed;filter:none}
button.ghost{background:var(--panel2);color:var(--txt);border:1px solid var(--line)}
input,textarea,select{font:inherit;color:var(--txt);background:var(--panel2);
  border:1px solid var(--line);border-radius:9px;padding:10px 12px;width:100%}
input:focus,textarea:focus{outline:2px solid rgba(76,194,255,.45);border-color:transparent}
textarea{resize:vertical;min-height:52px;line-height:1.55}

/* ---------- start ---------- */
.center{min-height:100%;display:grid;place-items:center;padding:24px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:16px;
  padding:30px;max-width:460px;width:100%}
.card h1{margin:0 0 6px;font-size:23px;letter-spacing:-.01em}
.card p.sub{margin:0 0 22px;color:var(--dim);font-size:14px}
.field{margin-bottom:14px}
.field label{display:block;font-size:13px;color:var(--dim);margin-bottom:6px}
.err{color:var(--bad);font-size:14px;margin-top:10px;min-height:20px}

/* ---------- podręcznik: pełny ekran ---------- */
.book{height:100vh;display:flex;flex-direction:column;background:#0b0f15;position:relative}
.bookbar{display:flex;align-items:center;gap:8px;padding:10px 16px;
  border-bottom:1px solid var(--line);background:var(--panel);flex-wrap:wrap}
.bookbar button{padding:7px 13px;font-size:15px;line-height:1}
.bookbar select{width:auto;padding:7px 10px;font-size:14px}
.bookbar .spread{font-family:var(--mono);font-size:14px;color:var(--dim);
  min-width:82px;text-align:center}
.bookbar .zlevel{font-family:var(--mono);font-size:13px;color:var(--dim);
  min-width:52px;text-align:center}
.bookbar .sep{width:1px;height:22px;background:var(--line);margin:0 4px}
.bookbar .grow{flex:1}
.bookbar .miniprog{font-family:var(--mono);font-size:13px;color:var(--faint)}

.bookview{flex:1;overflow:auto;padding:16px;display:flex;justify-content:center;
  align-items:flex-start;background:#0b0f15}
.bookview img{display:block;background:#fff;border-radius:8px;user-select:none;
  box-shadow:0 8px 30px rgba(0,0,0,.45)}
.bookview img.fit{max-width:100%;max-height:100%;width:auto;object-fit:contain}
.bookview:not(.grabbing) img:not(.fit){cursor:grab}
.bookview.grabbing{cursor:grabbing}

.scrolldown{position:absolute;left:50%;transform:translateX(-50%);bottom:18px;
  background:rgba(23,30,40,.94);color:var(--txt);border:1px solid var(--line);
  border-radius:999px;padding:9px 20px;font-size:14px;font-weight:500;
  backdrop-filter:blur(8px);box-shadow:0 6px 20px rgba(0,0,0,.4)}
.scrolldown:hover{border-color:var(--acc);color:var(--acc)}

/* ---------- karta pracy pod spodem ---------- */
.work{min-height:100vh;border-top:1px solid var(--line)}
.workhead{position:sticky;top:0;z-index:5;background:var(--panel);
  border-bottom:1px solid var(--line);padding:14px 22px;
  display:flex;align-items:center;justify-content:space-between;gap:16px}
.workhead h1{margin:0 0 2px;font-size:18px;letter-spacing:-.01em}
.workhead .who{color:var(--dim);font-size:13px}
.bar{height:5px;background:var(--panel2);overflow:hidden;position:sticky;top:68px;z-index:5}
.bar i{display:block;height:100%;background:var(--ok);width:0;transition:width .3s}
.workbody{max-width:880px;margin:0 auto;padding:24px 22px 70px}
.intro{color:var(--dim);font-size:14px;background:var(--panel);border:1px solid var(--line);
  border-radius:12px;padding:14px 16px;margin-bottom:22px}

.q{background:var(--panel);border:1px solid var(--line);border-radius:14px;
  padding:18px 20px;margin-bottom:16px}
.q.done{border-color:rgba(61,220,151,.45)}
.q .qtop{display:flex;align-items:center;gap:10px;margin-bottom:10px;flex-wrap:wrap}
.q .num{font-family:var(--mono);font-size:12px;color:var(--acc);font-weight:600}
.q .part{font-size:12px;color:var(--faint)}
.q .txt{font-size:16px;line-height:1.55;margin-bottom:12px}
.q .meta{margin-top:10px}
.q .jump{background:var(--panel2);border:1px solid var(--line);color:var(--acc);
  padding:6px 12px;border-radius:8px;font-size:13px;font-weight:500}
.q .jump:hover{border-color:var(--acc)}
.pill{font-size:11px;padding:2px 9px;border-radius:99px;background:var(--panel2);
  border:1px solid var(--line);color:var(--dim)}

.pager{display:flex;align-items:center;justify-content:center;gap:14px;
  margin:26px 0 18px;flex-wrap:wrap}
.pager .pnum{font-family:var(--mono);font-size:13px;color:var(--dim);min-width:52px;
  text-align:center}
.dots{display:flex;gap:7px}
.dots i{width:9px;height:9px;border-radius:50%;background:var(--line);cursor:pointer;
  transition:.18s}
.dots i.part{background:var(--warn)}
.dots i.full{background:var(--ok)}
.dots i.on{background:var(--acc);transform:scale(1.5)}

.finishrow{display:flex;align-items:center;justify-content:space-between;gap:16px;
  border-top:1px solid var(--line);padding-top:20px;flex-wrap:wrap}
.finishrow .cnt{color:var(--dim);font-size:14px}

@media(max-width:700px){
  .workhead{flex-direction:column;align-items:flex-start;gap:8px}
  .bar{top:96px}
  .bookbar{gap:6px;padding:9px 12px}
  .bookbar .grow,.bookbar .miniprog{display:none}
}

/* ---------- AFK ---------- */
.afk{position:fixed;inset:0;z-index:50;display:none;place-items:center;
  background:rgba(8,11,16,.86);backdrop-filter:blur(3px)}
.afk.on{display:grid}
.afk .box{background:var(--panel);border:2px solid var(--warn);border-radius:16px;
  padding:30px 34px;max-width:420px;text-align:center}
.afk h2{margin:0 0 8px;font-size:22px;color:var(--warn)}
.afk p{color:var(--dim);margin:0 0 20px}

/* ---------- admin ---------- */
.adm{max-width:1100px;margin:0 auto;padding:26px 20px 60px}
.adm h1{font-size:22px;margin:0 0 4px}
.adm .sub{color:var(--dim);font-size:14px;margin-bottom:22px}
table{width:100%;border-collapse:collapse}
th,td{padding:11px 12px;text-align:left;border-bottom:1px solid var(--line);font-size:14px}
th{font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--faint)}
td.num{font-family:var(--mono)}
tr.afk-row td{background:rgba(255,200,87,.07)}
.tag{font-size:11px;padding:2px 9px;border-radius:99px;font-weight:600}
.tag.ok{background:rgba(61,220,151,.16);color:var(--ok)}
.tag.afk{background:rgba(255,200,87,.16);color:var(--warn)}
.tag.work{background:rgba(76,194,255,.16);color:var(--acc)}
.mini{padding:5px 11px;font-size:13px;border-radius:7px}
.empty{color:var(--faint);padding:30px 0;text-align:center}
details{margin-top:8px}
summary{cursor:pointer;color:var(--acc);font-size:13px}
.ans{background:var(--panel2);border-left:3px solid var(--acc);padding:8px 12px;
  margin:8px 0;border-radius:0 8px 8px 0;white-space:pre-wrap;font-size:13.5px}
.ans .qq{color:var(--dim);font-size:12px;margin-bottom:4px}

/* pole na kod — monospace, tabulator wstawia spacje (obsługa w app.html) */
textarea.codearea{
  font-family:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  font-size:13px;line-height:1.5;tab-size:4;white-space:pre;overflow-wrap:normal;
  overflow-x:auto;background:#0f1722;border-color:rgba(76,194,255,.25)
}
.q.codeq{border-left:3px solid #16a34a}
.q.codeq .num{background:rgba(22,163,74,.18);color:#4ade80}

/* historia prac ucznia */
.afk .box.wide{max-width:760px;width:92vw}
table.histtab{width:100%;border-collapse:collapse;margin-top:10px;font-size:14px}
table.histtab th{text-align:left;color:#9aa5b1;font-weight:600;font-size:12px;
  text-transform:uppercase;letter-spacing:.04em;padding:6px 8px;border-bottom:1px solid rgba(255,255,255,.12)}
table.histtab td{padding:8px;border-bottom:1px solid rgba(255,255,255,.06);vertical-align:top}
table.histtab a{color:#4cc2ff}
.afk .box.wide table.histtab{text-align:left}

/* logowanie / rejestracja */
.tabs{display:flex;gap:6px;margin:4px 0 16px}
.tabs .tab{flex:1;background:var(--panel2);border:1px solid rgba(255,255,255,.1);
  color:#9aa5b1;border-radius:10px;padding:9px 10px;font-weight:600;cursor:pointer}
.tabs .tab.on{background:rgba(76,194,255,.14);border-color:rgba(76,194,255,.45);color:#cfe9ff}
.field select{width:100%}

/* brama kodem lekcji */
.gate .box{max-width:460px}
.gate input{width:100%;text-align:center;font-size:30px;letter-spacing:.35em;
  font-family:ui-monospace,monospace;padding:12px}
.lessonbar{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:6px}
.lessonbar input{padding:7px 10px}

/* ===== strona „Moje lekcje” ===== */
.lekh{font-size:15px;letter-spacing:.04em;text-transform:uppercase;color:#9aa5b1;
  margin:22px 0 10px;font-weight:600}
.lek{background:var(--panel);border:1px solid rgba(255,255,255,.08);border-left:4px solid #7b8794;
  border-radius:14px;padding:16px 18px;margin-bottom:12px}
.lek.done{border-left-color:#22c55e}
.lek.wip{border-left-color:#fbbf24}
.lek.new{border-left-color:#4b5563}
.lek.active{border-color:rgba(76,194,255,.5);box-shadow:0 0 0 1px rgba(76,194,255,.25)}
.lektop{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}
.lektitle{font-size:17px;font-weight:700}
.leksub{color:#9aa5b1;font-size:13px;margin-top:2px}
.badge{font-size:11px;text-transform:uppercase;letter-spacing:.05em;font-weight:700;
  padding:4px 10px;border-radius:999px;white-space:nowrap}
.badge.done{background:rgba(34,197,94,.16);color:#4ade80}
.badge.wip{background:rgba(251,191,36,.16);color:#fbbf24}
.badge.new{background:rgba(255,255,255,.07);color:#9aa5b1}
.lek .bar{height:6px;background:rgba(255,255,255,.07);border-radius:99px;margin:12px 0 10px;overflow:hidden}
.lek .bar i{display:block;height:100%;background:linear-gradient(90deg,#4cc2ff,#22c55e)}
.lekmeta{display:flex;flex-wrap:wrap;gap:6px 18px;color:#9aa5b1;font-size:13px}
.lekact{display:flex;gap:8px;margin-top:14px;flex-wrap:wrap}
.btn-sm{display:inline-block;padding:7px 14px;border-radius:9px;font-size:13px;font-weight:600;
  text-decoration:none;background:var(--panel2);color:#cfe9ff;border:1px solid rgba(255,255,255,.1)}
.btn-sm.primary{background:rgba(76,194,255,.16);border-color:rgba(76,194,255,.45)}
.btn-sm:hover{filter:brightness(1.15)}

/* ===== profil ucznia ===== */
.profil{margin-bottom:8px}
.phead{display:flex;align-items:center;gap:16px}
.avatar{width:62px;height:62px;border-radius:50%;flex:none;display:grid;place-items:center;
  font-size:23px;font-weight:700;color:#0b1016;
  background:linear-gradient(135deg,#4cc2ff,#22c55e)}
.pname{font-size:23px;font-weight:700;line-height:1.2}
.pmeta{display:flex;flex-wrap:wrap;gap:6px 14px;color:#9aa5b1;font-size:13px;margin-top:5px;
  align-items:center}
.chip{background:rgba(76,194,255,.16);border:1px solid rgba(76,194,255,.4);color:#cfe9ff;
  padding:2px 10px;border-radius:999px;font-size:12px;font-weight:600}
.tiles{display:grid;gap:10px;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));margin-top:18px}
.tile{background:var(--panel);border:1px solid rgba(255,255,255,.08);border-radius:12px;
  padding:13px 15px}
.tile b{display:block;font-size:20px;font-weight:700}
.tile span{color:#9aa5b1;font-size:12px;text-transform:uppercase;letter-spacing:.04em}

/* komunikat zanim przyjdzie /api/config i poznamy nazwę pliku strony */
#bookloading{padding:26px 18px;color:#8b97a8;font-size:14px;text-align:center;align-self:center}
#bookloading.hidden{display:none}