/* =============================================================================
   INF.03 Learning v0.2 — system wyglądu
   Motyw ciemny "czytelniczy": ciepłe, wygaszone barwy i niski kontrast,
   żeby dało się z tego uczyć dłużej bez zmęczenia wzroku.
   Bez zewnętrznych bibliotek CSS.
   ============================================================================= */

:root {
  /* Tlo — ciepłe, grafitowe. Nie czarne: czysta czerń przy jasnym tekscie
     daje największe zmęczenie wzroku przy dlugim czytaniu. */
  --bg:        #12151a;
  --bg-1:      #181c22;
  --bg-2:      #1e232b;
  --bg-3:      #252b35;
  --bg-hover:  #2c3340;

  /* linie — subtelne, bez niebieskiego "neonu" */
  --line:      #2e3540;
  --line-soft: #232932;

  /* Tekst — ciepła biel zamiast ostrej (#fff daje halo i męczy).
     Kontrast ok. 11:1 dla tekstu glownego, 6:1 dla drugiego planu. */
  --txt:       #dfe3e8;
  --txt-2:     #9ba3ae;
  --txt-3:     #6f7884;

  /* Akcent — przygaszony błękit. Emocjonalnie spokojniejszy od neonu,
     a wciąż czytelnie odcina elementy aktywne. */
  --acc:       #7ba7d9;
  --acc-2:     #6894c7;
  --acc-soft:  rgba(123, 167, 217, 0.10);
  --acc-line:  rgba(123, 167, 217, 0.35);
  --vio:       #9b8ac4;

  /* Kolory stanu — mocno wygaszone. To sygnal, nie dekoracja. */
  --ok:        #7fbf9a;
  --ok-soft:   rgba(127, 191, 154, 0.10);
  --bad:       #d99a9a;
  --bad-soft:  rgba(217, 154, 154, 0.10);
  --warn:      #d9bc84;
  --warn-soft: rgba(217, 188, 132, 0.10);

  /* wymiary */
  --r:    14px;
  --r-sm: 9px;
  --r-xs: 6px;
  --sidebar: 264px;
  /* szerokosc tresci - rosnie z ekranem, zeby na 2K/4K nie bylo pustych pol */
  --content-max: 1600px;

  /* cienie — lagodne, ciepłe */
  --sh-sm: 0 1px 2px rgba(0,0,0,.22);
  --sh:    0 4px 16px rgba(0,0,0,.26);
  --sh-lg: 0 12px 40px rgba(0,0,0,.34);

  --mono: ui-monospace, "Cascadia Code", "JetBrains Mono", Consolas, monospace;
  --sans: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;

  --tr: 160ms cubic-bezier(.4, 0, .2, 1);
}

* { box-sizing: border-box; }

html, body, #root { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--txt);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* tlo z bardzo delikatna poswiata - bez tego jest "plasko", z mocniejsza męczy */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(900px 520px at 12% -12%, rgba(123,167,217,.035), transparent 62%),
    radial-gradient(760px 440px at 88% -6%, rgba(155,138,196,.030), transparent 62%);
  z-index: 0;
}

h1, h2, h3, h4 { margin: 0 0 .5em; line-height: 1.25; font-weight: 650; letter-spacing: -.01em; }
p { margin: 0 0 1em; }
a { color: var(--acc); text-decoration: none; }
a:hover { text-decoration: underline; }
code { font-family: var(--mono); font-size: .9em; }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--bg-3); border-radius: 99px; border: 2px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: var(--line); }

/* ============================================================== Uklad strony */
.app { display: flex; min-height: 100%; position: relative; z-index: 1; }

.sidebar {
  width: var(--sidebar);
  flex: 0 0 var(--sidebar);
  background: linear-gradient(180deg, var(--bg-1), var(--bg));
  border-right: 1px solid var(--line-soft);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.sidebar-brand {
  display: flex; align-items: center; gap: 11px;
  padding: 20px 18px 18px;
  border-bottom: 1px solid var(--line-soft);
}
/* Logo: "INF.03" w JEDNEJ linii.
   Kafelek nie moze byc sztywno kwadratowy — napis jest szerszy niz wysoki,
   dlatego min-width zamiast width i padding po bokach. */
.brand-mark {
  flex: 0 0 auto;
  min-width: 38px; height: 38px;
  padding: 0 9px;
  border-radius: 11px;
  background: linear-gradient(140deg, #2f3a48, #232a34);
  border: 1px solid var(--line);
  display: grid; place-items: center;
  font-weight: 700; font-size: 13px; letter-spacing: .02em;
  color: var(--acc);
  white-space: nowrap;
  box-shadow: var(--sh-sm);
}
.brand-text strong { display: block; font-size: 15px; line-height: 1.2; }
.brand-text span { font-size: 11px; color: var(--txt-3); letter-spacing: .06em; text-transform: uppercase; }

.sidebar-nav { padding: 14px 12px; display: flex; flex-direction: column; gap: 3px; flex: 1; }
.nav-section {
  font-size: 10.5px; font-weight: 700; letter-spacing: .09em; text-transform: uppercase;
  color: var(--txt-3); padding: 14px 10px 6px;
}
.nav-link {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 10px; border-radius: var(--r-sm);
  color: var(--txt-2); font-size: 13.5px; font-weight: 500;
  transition: var(--tr);
}
.nav-link:hover { background: var(--bg-2); color: var(--txt); text-decoration: none; }
.nav-link.active { background: var(--acc-soft); color: var(--acc); font-weight: 600; }
.nav-link svg { flex: 0 0 18px; }
.nav-link > span:first-of-type {
  flex: 1; min-width: 0;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.nav-count {
  flex: 0 0 auto;
  font-size: 11px; color: var(--txt-3);
  background: var(--bg-2); padding: 1px 7px; border-radius: 99px;
}
.nav-link.active .nav-count { background: var(--acc-soft); color: var(--acc); }

.sidebar-foot {
  padding: 14px 18px; border-top: 1px solid var(--line-soft);
  font-size: 11.5px; color: var(--txt-3); line-height: 1.6;
}

.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }

.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 14px;
  padding: 12px 28px;
  background: rgba(10,14,20,.82);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-soft);
}
/* Tytul MUSI zmiescic sie w jednej linii - dlugie nazwy sie skracaja wielokropkiem */
.topbar-title {
  flex: 1; min-width: 0;
  font-size: 17px; margin: 0;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.topbar-sub {
  font-size: 12.5px; color: var(--txt-3);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
/* Przycisk menu (hamburger) — TYLKO na wąskich ekranach.
   Uwaga: element ma tez klasę .btn, która ustawia `display: inline-flex`.
   Dlatego reguła ukrywająca musi być bardziej szczegółowa (button.menu-btn),
   inaczej .btn wygrywa i hamburger pokazuje się też na pełnym widoku. */
button.menu-btn { display: none; flex: 0 0 auto; }

.content {
  padding: 26px 28px 70px;
  max-width: var(--content-max);
  width: 100%;
  margin: 0 auto;
}

@media (min-width: 1800px) { :root { --content-max: 1840px; } }
@media (min-width: 2200px) { :root { --content-max: 2120px; } }
@media (min-width: 2600px) { :root { --content-max: 2400px; } }

/* ================================================================= Karty */
.card {
  background: var(--bg-1);
  border: 1px solid var(--line-soft);
  border-radius: var(--r);
  padding: 20px;
  transition: var(--tr);
}
.card-hover:hover { border-color: var(--line); transform: translateY(-2px); box-shadow: var(--sh); }

.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(168px, 1fr)); }

/* ================================================================ Hero */
.hero {
  background: linear-gradient(150deg, rgba(123,167,217,.055), rgba(155,138,196,.035) 55%, transparent);
  border: 1px solid var(--line);
  border-radius: var(--r);
  padding: 30px;
  margin-bottom: 24px;
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: ""; position: absolute; top: -60%; right: -8%;
  width: 300px; height: 300px; border-radius: 50%;
  background: radial-gradient(circle, rgba(123,167,217,.06), transparent 70%);
}
.hero h1 { font-size: clamp(23px, 3vw, 33px); margin-bottom: 8px; }
.hero p { color: var(--txt-2); max-width: 62ch; margin-bottom: 0; }

/* =============================================================== Przyciski */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 9px 16px;
  border-radius: var(--r-sm);
  border: 1px solid var(--line);
  background: var(--bg-2);
  color: var(--txt);
  font: inherit; font-size: 14px; font-weight: 550;
  cursor: pointer;
  transition: var(--tr);
  white-space: nowrap;
}
.btn:hover:not(:disabled) { background: var(--bg-hover); border-color: #33415a; }
.btn:active:not(:disabled) { transform: translateY(1px); }
.btn:disabled { opacity: .42; cursor: not-allowed; }

.btn-primary {
  background: var(--acc);
  border-color: var(--acc); color: #10141a; font-weight: 620;
}
.btn-primary:hover:not(:disabled) { background: var(--acc-2); border-color: var(--acc-2); }

.btn-ghost { background: transparent; border-color: transparent; color: var(--txt-2); }
.btn-ghost:hover:not(:disabled) { background: var(--bg-2); color: var(--txt); border-color: transparent; }

.btn-lg { padding: 13px 24px; font-size: 15.5px; border-radius: var(--r); }
.btn-sm { padding: 6px 11px; font-size: 13px; }
.btn-block { width: 100%; }

/* ================================================================== Chipy */
.chip {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 6px 13px; border-radius: 99px;
  border: 1px solid var(--line); background: var(--bg-2);
  color: var(--txt-2); font-size: 13px; font-weight: 550;
  cursor: pointer; transition: var(--tr);
}
.chip:hover { background: var(--bg-hover); color: var(--txt); }
.chip.active { background: var(--acc-soft); border-color: var(--acc-line); color: var(--acc); }

.badge {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 3px 10px; border-radius: 99px;
  font-size: 11.5px; font-weight: 650;
  background: var(--bg-3); color: var(--txt-2);
}
.badge-ok   { background: var(--ok-soft);   color: var(--ok); }
.badge-bad  { background: var(--bad-soft);  color: var(--bad); }
.badge-warn { background: var(--warn-soft); color: var(--warn); }
.badge-acc  { background: var(--acc-soft);  color: var(--acc); }

/* =================================================================== KPI */
.kpi { display: flex; flex-direction: column; gap: 3px; }
.kpi-val { font-size: 30px; font-weight: 720; line-height: 1.1; letter-spacing: -.02em; }
.kpi-lbl { font-size: 12.5px; color: var(--txt-2); }

/* ================================================================ Pytanie */
/* Uklad testu: pytanie + panel nawigacji. Na szerokich ekranach panel
   jest wiekszy i przyklejony, na waskich spada pod pytanie. */
.quiz-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) clamp(230px, 20vw, 320px);
  gap: 22px;
  align-items: start;
}

.q-head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 14px; flex-wrap: wrap; margin-bottom: 16px;
}
.q-text { font-size: 16.5px; line-height: 1.68; margin-bottom: 18px; white-space: pre-wrap; word-break: break-word; color: #e6e9ee; }

.opts { display: flex; flex-direction: column; gap: 8px; margin-bottom: 20px; }
.opt {
  display: flex; gap: 13px; align-items: flex-start; width: 100%;
  padding: 13px 16px; text-align: left;
  background: var(--bg-2); border: 1px solid var(--line);
  border-radius: var(--r-sm); color: inherit; font: inherit;
  cursor: pointer; transition: var(--tr);
}
.opt:hover:not(.locked) { background: var(--bg-3); }
.opt-key {
  flex: 0 0 26px; height: 26px; border-radius: 50%;
  background: var(--bg); border: 1px solid var(--line);
  display: grid; place-items: center;
  font-size: 12.5px; font-weight: 620; color: var(--txt-2);
}
.opt-txt { flex: 1; word-break: break-word; white-space: pre-wrap; line-height: 1.55; }
/* Wybrana — subtelne podswietlenie, bez krzykliwego koloru */
.opt.sel { border-color: var(--acc-line); background: var(--acc-soft); }
.opt.sel .opt-key { background: var(--acc); border-color: var(--acc); color: #10141a; }
/* Poprawna / bledna — akcent na obwodce i literze, tlo bardzo subtelne */
.opt.ok { border-color: var(--ok); background: var(--ok-soft); }
.opt.ok .opt-key { background: var(--ok); border-color: var(--ok); color: #101a14; }
.opt.bad { border-color: var(--bad); background: var(--bad-soft); }
.opt.bad .opt-key { background: var(--bad); border-color: var(--bad); color: #1c1012; }
.opt.locked { cursor: default; }

/* ============================================================= Wyjasnienie */
.explain {
  border-radius: var(--r);
  border: 1px solid var(--line);
  background: var(--bg-1);
  overflow: hidden;
  margin-top: 18px;
  animation: slideIn 240ms cubic-bezier(.2,.8,.3,1);
}
@keyframes slideIn { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: none; } }

.explain-head {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 16px;
  font-size: 13.5px; font-weight: 650;
  border-bottom: 1px solid var(--line-soft);
}
.explain-head.ok  { background: var(--ok-soft);  color: var(--ok); }
.explain-head.bad { background: var(--bad-soft); color: var(--bad); }
.explain-body { padding: 15px 17px; }

.explain-why {
  font-size: 14.5px; line-height: 1.65; color: var(--txt);
  margin-bottom: 14px;
}
/* Metadane wyjasnienia. <dt> i <dd> sa bezposrednimi dziecmi <dl>,
   dlatego uklad robimy na gridzie dwoch kolumn. */
.explain-meta {
  display: grid;
  grid-template-columns: 108px 1fr;
  gap: 8px 10px;
  padding-top: 13px;
  border-top: 1px solid var(--line-soft);
  font-size: 13px;
  margin: 0;
}
.explain-meta dt {
  color: var(--txt-3); font-size: 12.5px;
  align-self: start;
}
.explain-meta dd {
  margin: 0; color: var(--txt-2);
  display: flex; align-items: baseline; flex-wrap: wrap; gap: 2px;
}
.explain-meta dd strong { color: var(--txt); }
.explain-meta dd a { text-decoration: none; border-bottom: 1px solid var(--acc-line); }
.explain-meta dd a:hover { border-bottom-color: var(--acc); text-decoration: none; }
/* Informacja, gdy wyjasnienie jest tylko ogolna wskazowka */
.explain-note {
  margin: 0 0 4px;
  padding: 9px 12px;
  background: var(--bg-2);
  border-left: 2px solid var(--txt-3);
  border-radius: 0 var(--r-xs) var(--r-xs) 0;
  font-size: 12.5px;
  color: var(--txt-3);
  line-height: 1.5;
}
/* Naglowek wskazowki — zeby bylo jasne, ze to podpowiedz, nie wyklad */
.explain-lead { color: var(--txt-2); font-weight: 620; }

/* ================================================================== Tabela */
.tbl-wrap { overflow-x: auto; margin: 14px 0; border: 1px solid var(--line); border-radius: var(--r-sm); }
table.tbl { border-collapse: collapse; width: 100%; font-size: 14px; }
table.tbl td, table.tbl th { border: 1px solid var(--line); padding: 9px 13px; text-align: left; vertical-align: top; }
table.tbl th { background: var(--bg-2); font-weight: 650; }
table.tbl tr:nth-child(even) td { background: rgba(255,255,255,.018); }

/* =============================================================== Kod blok */
pre.kod {
  margin: 14px 0; padding: 15px 17px;
  background: #05080d; border: 1px solid var(--line);
  border-left: 3px solid var(--acc); border-radius: var(--r-sm);
  overflow-x: auto;
}
pre.kod code {
  font-family: var(--mono); font-size: 13.5px; line-height: 1.65;
  white-space: pre; color: #c9e0ff; background: none; padding: 0;
}
.q-text code, .opt-txt code {
  font-family: var(--mono); font-size: .92em;
  background: rgba(0,0,0,.4); padding: 1px 6px; border-radius: 5px;
}

/* ================================================================ Obrazek */
.q-img img {
  max-width: 100%; height: auto; display: block;
  border: 1px solid var(--line); border-radius: var(--r-sm);
  background: #fff; cursor: zoom-in;
}
.q-img.max img { max-height: 380px; width: auto; }
.q-img-cap { font-size: 12.5px; color: var(--txt-3); margin-top: 7px; }

.hint-box {
  display: flex; gap: 11px; align-items: flex-start;
  padding: 12px 15px; margin: 14px 0;
  background: var(--warn-soft); border: 1px solid rgba(217,188,132,.32);
  border-radius: var(--r-sm); font-size: 13.5px; color: var(--warn);
  line-height: 1.55;
}

/* ================================================================ Postep */
.progress { height: 6px; background: var(--bg-2); border-radius: 99px; overflow: hidden; }
.progress-fill {
  height: 100%; border-radius: 99px;
  background: var(--acc);
  transition: width 260ms cubic-bezier(.4,0,.2,1);
}

.timer {
  font-family: var(--mono); font-size: 17px; font-weight: 700;
  padding: 6px 14px; border-radius: var(--r-sm);
  background: var(--bg-2); border: 1px solid var(--line);
  min-width: 92px; text-align: center; white-space: nowrap;
}
.timer.low { color: var(--bad); border-color: var(--bad); animation: pulse 1s infinite; }
.timer.nolimit { font-size: 13px; font-weight: 600; color: var(--txt-2); }
@keyframes pulse { 50% { opacity: .55; } }

/* ============================================================ Nawigacja pytan */
.qnav { display: grid; grid-template-columns: repeat(8, 1fr); gap: 5px; }
.qnav-btn {
  aspect-ratio: 1; border-radius: var(--r-xs);
  border: 1px solid var(--line); background: var(--bg-2);
  color: var(--txt-2); font-size: 12px; font-weight: 650;
  cursor: pointer; transition: var(--tr); position: relative;
  display: grid; place-items: center; padding: 0;
}
.qnav-btn:hover { border-color: var(--acc); }
.qnav-btn.done { background: var(--ok-soft); border-color: var(--ok); color: var(--ok); }
.qnav-btn.cur { outline: 2px solid var(--acc); outline-offset: 1px; }
.qnav-btn.flag::after {
  content: ""; position: absolute; top: 2px; right: 2px;
  width: 5px; height: 5px; border-radius: 50%; background: var(--warn);
}

/* ================================================================== Wynik */
.ring { position: relative; width: 152px; height: 152px; flex: 0 0 152px; }
.ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.ring-bg { fill: none; stroke: var(--bg-3); stroke-width: 9; }
.ring-fg {
  fill: none; stroke-width: 9; stroke-linecap: round;
  stroke-dasharray: 327; transition: stroke-dashoffset 900ms cubic-bezier(.2,.8,.3,1);
}
.ring-txt { position: absolute; inset: 0; display: grid; place-content: center; text-align: center; gap: 2px; }
.ring-txt b { font-size: 33px; line-height: 1; letter-spacing: -.02em; }
.ring-txt span { font-size: 12.5px; color: var(--txt-2); }

/* ================================================================ Kategorie */
.cat-card {
  display: flex; flex-direction: column; gap: 11px;
  padding: 17px; text-align: left; width: 100%;
  background: var(--bg-1); border: 1px solid var(--line-soft);
  border-radius: var(--r); color: inherit; font: inherit;
  cursor: pointer; transition: var(--tr);
}
.cat-card:hover { border-color: var(--acc); background: var(--bg-2); transform: translateY(-2px); }
.cat-top { display: flex; align-items: center; justify-content: space-between; }
.cat-ico {
  width: 36px; height: 36px; border-radius: var(--r-sm);
  background: var(--acc-soft); color: var(--acc);
  display: grid; place-items: center;
}
.cat-name { font-weight: 620; font-size: 14.5px; }
.cat-count { font-size: 12.5px; color: var(--txt-3); }
.cat-bar { height: 4px; background: var(--bg-3); border-radius: 99px; overflow: hidden; }
.cat-bar i { display: block; height: 100%; background: var(--acc); }

/* ================================================================= Materialy */
.mat-layout { display: grid; grid-template-columns: 268px 1fr; gap: 24px; align-items: start; }
.mat-toc {
  position: sticky; top: 78px;
  max-height: calc(100vh - 110px); overflow-y: auto;
  background: var(--bg-1); border: 1px solid var(--line-soft);
  border-radius: var(--r); padding: 14px;
}
.mat-toc-item {
  display: block; padding: 6px 10px; border-radius: var(--r-xs);
  color: var(--txt-2); font-size: 13px; line-height: 1.45;
  cursor: pointer; transition: var(--tr);
}
.mat-toc-item:hover { background: var(--bg-2); color: var(--txt); text-decoration: none; }
.mat-toc-item.lvl3 { padding-left: 22px; font-size: 12.5px; color: var(--txt-3); }
/* Aktualnie czytany moduł / dział */
.mat-toc-item.is-cur { background: var(--acc-soft); color: var(--acc); font-weight: 600; }
.mat-toc-head {
  display: flex; align-items: center; gap: 7px;
  font-size: 11px; font-weight: 700; letter-spacing: .07em;
  text-transform: uppercase; color: var(--txt-3);
  padding: 0 10px 8px;
}

.md { font-size: 15.2px; line-height: 1.72; }
.md h1 { font-size: 27px; margin: 0 0 18px; }
.md h2 {
  font-size: 21px; margin: 34px 0 13px; padding-top: 18px;
  border-top: 1px solid var(--line-soft); scroll-margin-top: 82px;
}
.md h3 { font-size: 17px; margin: 24px 0 10px; scroll-margin-top: 82px; }
.md h4 { font-size: 15.5px; margin: 18px 0 8px; color: var(--txt-2); }
.md ul, .md ol { padding-left: 23px; margin: 0 0 15px; }
.md li { margin-bottom: 6px; }
.md blockquote {
  margin: 16px 0; padding: 13px 17px;
  border-left: 3px solid var(--acc); background: var(--acc-soft);
  border-radius: 0 var(--r-sm) var(--r-sm) 0; color: var(--txt-2);
}
.md blockquote p:last-child { margin-bottom: 0; }
.md hr { border: none; border-top: 1px solid var(--line-soft); margin: 28px 0; }
.md strong { color: #eef1f5; font-weight: 640; }

/* Linki do w3schools — wyroznione, bo to najczesciej uzywane zrodlo w materialach */
.md a.link-w3 {
  color: var(--acc);
  border-bottom: 1px dotted var(--acc-line);
  text-decoration: none;
  white-space: nowrap;
}
.md a.link-w3:hover { border-bottom-color: var(--acc); border-bottom-style: solid; }
.link-w3-mark {
  display: inline-block;
  font-size: 9.5px; font-weight: 700; letter-spacing: .04em;
  text-transform: uppercase;
  background: var(--acc-soft); color: var(--acc);
  border: 1px solid var(--acc-line);
  border-radius: 4px;
  padding: 0 4px; margin-left: 3px;
  vertical-align: 1px;
}

/* ================================================================== Toast */
.toast {
  position: fixed; bottom: 26px; left: 50%; transform: translateX(-50%);
  padding: 12px 24px; border-radius: 99px;
  background: var(--bg-3); border: 1px solid var(--acc);
  font-size: 14px; font-weight: 550; z-index: 200;
  box-shadow: var(--sh-lg); animation: toastIn 240ms cubic-bezier(.2,.8,.3,1);
}
@keyframes toastIn { from { opacity: 0; transform: translate(-50%, 14px); } to { opacity: 1; transform: translate(-50%, 0); } }

/* =============================================================== Lightbox */
.lightbox {
  position: fixed; inset: 0; z-index: 300;
  background: rgba(0,0,0,.92);
  display: grid; place-items: center; padding: 30px; cursor: zoom-out;
}
.lightbox img { max-width: 100%; max-height: 100%; border-radius: var(--r-sm); background: #fff; }
.lightbox-close {
  position: absolute; top: 18px; right: 22px;
  width: 42px; height: 42px; border-radius: 50%;
  background: var(--bg-3); border: 1px solid var(--line);
  color: var(--txt); font-size: 19px; cursor: pointer;
}

/* ================================================================== Pusto */
.empty { text-align: center; padding: 48px 20px; color: var(--txt-3); }
.empty svg { opacity: .35; margin-bottom: 14px; }

/* ================================================================ Responsive */
@media (max-width: 900px) {
  .quiz-layout { grid-template-columns: 1fr; }
  .quiz-layout > aside { position: static !important; }
  .mat-layout { grid-template-columns: 1fr; }
  .mat-toc { position: static; max-height: 300px; }
}

@media (max-width: 860px) {
  .sidebar {
    position: fixed; inset: 0 auto 0 0; z-index: 100;
    transform: translateX(-100%); transition: transform 240ms cubic-bezier(.4,0,.2,1);
    box-shadow: var(--sh-lg);
  }
  .sidebar.open { transform: none; }
  button.menu-btn { display: inline-flex; }
  .content { padding: 18px 16px 60px; }
  .topbar { padding: 11px 16px; }
  .qnav { grid-template-columns: repeat(6, 1fr); }
  .overlay {
    position: fixed; inset: 0; background: rgba(0,0,0,.6);
    z-index: 99; backdrop-filter: blur(2px);
  }
}

@media (max-width: 520px) {
  .hero { padding: 22px 18px; }
  .card { padding: 16px; }
  .q-text { font-size: 16px; }
  .ring { width: 124px; height: 124px; flex-basis: 124px; }
  .ring-txt b { font-size: 26px; }
}

/* =============================================================================
   DODATEK v0.3 — style wlasne wersji statycznej (bez Reacta)
   ============================================================================= */

/* Wersja aplikacji w naglowku */
.brand-wersja { font-size: 10.5px; color: var(--txt-3); letter-spacing: .06em; }

/* Aktywna pozycja menu glownego (podswietlana przez router) */
.nav-link[aria-current="page"] {
  background: var(--acc-soft);
  color: var(--acc);
  font-weight: 600;
}

/* Ekran ladowania danych */
.ladowanie {
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; gap: 16px;
  min-height: 60vh; text-align: center; color: var(--txt-2);
}
.ladowanie-kolko {
  width: 42px; height: 42px; border-radius: 50%;
  border: 3px solid var(--line);
  border-top-color: var(--acc);
  animation: obrot 900ms linear infinite;
}
@keyframes obrot { to { transform: rotate(360deg); } }

/* Pasek postepu ladowania materialu */
.ladunek {
  height: 3px; background: var(--bg-2); border-radius: 99px;
  overflow: hidden; margin: 10px 0 18px;
}
.ladunek i {
  display: block; height: 100%; width: 30%;
  background: var(--acc); border-radius: 99px;
  animation: przewijanie 1.1s ease-in-out infinite;
}
@keyframes przewijanie {
  0%   { transform: translateX(-100%); }
  100% { transform: translateX(400%); }
}

/* Tabela w tresci pytania — przewijanie w poziomie */
.q-tabela { overflow-x: auto; margin: 14px 0; }
.q-tabela table { border-collapse: collapse; width: 100%; font-size: 13.5px; }
.q-tabela th, .q-tabela td {
  border: 1px solid var(--line); padding: 7px 10px; text-align: left;
}
.q-tabela th { background: var(--bg-2); font-weight: 620; }
.q-tabela tr:nth-child(even) td { background: rgba(255,255,255,.015); }

/* Kod w tresci pytania */
.q-kod {
  font-family: var(--mono); font-size: 13px; line-height: 1.6;
  background: var(--bg); border: 1px solid var(--line);
  border-radius: var(--r-sm); padding: 12px 14px; margin: 12px 0;
  overflow-x: auto; white-space: pre;
}

/* Spis modulow kursu — kafel z numerem */
.kurs-nr {
  display: grid; place-items: center;
  width: 30px; height: 30px; border-radius: 8px;
  background: var(--acc-soft); color: var(--acc);
  font-weight: 700; font-size: 14px;
}

/* Instrukcja importu bazy — kroki */
.kroki { padding-left: 20px; color: var(--txt-2); font-size: 13.5px; line-height: 1.7; }
.kroki code { background: var(--bg-2); padding: 1px 6px; border-radius: 4px; }

/* Info o wersji offline */
.offline-info {
  display: flex; gap: 10px; align-items: flex-start;
  padding: 12px 15px; margin: 16px 0;
  background: var(--ok-soft); border: 1px solid rgba(127,191,154,.3);
  border-radius: var(--r-sm); font-size: 13px; color: var(--txt-2);
  line-height: 1.55;
}
.offline-info b { color: var(--ok); }