:root {
  --bg: #0f1220;
  --bg-soft: #171b2e;
  --card: #1d2238;
  --card-2: #232944;
  --line: #2e3556;
  --text: #e8ebf6;
  --muted: #9aa3c4;
  --accent: #6c8cff;
  --accent-2: #57d1a8;
  --warn: #ffb454;
  --danger: #ff6b81;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

/* atrybut hidden musi wygrywać z regułami display:flex/inline-block z klas,
   inaczej np. pasek statusu („Analizuję…") wisi na ekranie cały czas */
[hidden] { display: none !important; }

body {
  margin: 0;
  font-family: var(--sans);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(108, 140, 255, 0.18), transparent),
    radial-gradient(900px 500px at -10% 10%, rgba(87, 209, 168, 0.12), transparent),
    var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.55;
}

/* ---------- Topbar ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 24px;
  border-bottom: 1px solid var(--line);
  background: rgba(15, 18, 32, 0.7);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 20;
}
.brand { display: flex; align-items: center; gap: 14px; }
.logo {
  font-size: 34px;
  width: 52px; height: 52px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-radius: 14px;
  color: #0b0e18;
  font-weight: 800;
  box-shadow: var(--shadow);
}
.topbar h1 { margin: 0; font-size: 22px; letter-spacing: .3px; }
.tagline { margin: 2px 0 0; color: var(--muted); font-size: 13.5px; max-width: 620px; }

/* ---------- Buttons ---------- */
.primary-btn {
  background: linear-gradient(135deg, var(--accent), #8aa2ff);
  color: #0b0e18;
  border: none;
  padding: 10px 18px;
  border-radius: 10px;
  font-weight: 700;
  cursor: pointer;
  transition: transform .12s ease, filter .12s ease;
}
.primary-btn:hover { filter: brightness(1.07); transform: translateY(-1px); }
.primary-btn.big { padding: 13px 22px; font-size: 15.5px; }
.ghost-btn.big { padding: 13px 18px; font-size: 14.5px; }
.action-btns { display: flex; gap: 10px; flex-wrap: wrap; }
@media (max-width: 560px) { .action-btns { width: 100%; flex-direction: column; } .action-btns button { width: 100%; } }
.primary-btn:disabled { opacity: .55; cursor: not-allowed; transform: none; }

.ghost-btn {
  background: var(--card-2);
  color: var(--text);
  border: 1px solid var(--line);
  padding: 9px 14px;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
}
.ghost-btn:hover { border-color: var(--accent); }
.link-btn {
  background: none; border: none; color: var(--accent);
  cursor: pointer; font: inherit; padding: 0; text-decoration: underline;
}

/* ---------- Layout ---------- */
main { max-width: 1040px; margin: 0 auto; padding: 26px 20px 60px; }

.input-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  display: grid;
  gap: 14px;
}

/* ---------- Dropzone ---------- */
.dropzone {
  border: 2px dashed var(--line);
  border-radius: 12px;
  padding: 22px;
  text-align: center;
  transition: border-color .15s, background .15s;
  background: var(--bg-soft);
}
.dropzone.dragover { border-color: var(--accent); background: rgba(108,140,255,.08); }
.big-icon { font-size: 38px; display: block; margin-bottom: 6px; }
.dropzone p { margin: 6px 0 4px; }
.dropzone small { color: var(--muted); }

.preview { position: relative; display: inline-block; max-width: 100%; }
.preview img { max-height: 320px; max-width: 100%; border-radius: 10px; border: 1px solid var(--line); }
.remove-img {
  position: absolute; top: 8px; right: 8px;
  background: rgba(0,0,0,.6); color: #fff; border: none;
  width: 30px; height: 30px; border-radius: 50%; cursor: pointer; font-size: 15px;
}

textarea {
  width: 100%;
  background: var(--bg-soft);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px;
  font-family: var(--mono);
  font-size: 14px;
  resize: vertical;
}
textarea:focus, input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

.input-extras {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.level-label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); flex: 1; min-width: 240px; }
.level-label input {
  background: var(--bg-soft); color: var(--text);
  border: 1px solid var(--line); border-radius: 10px; padding: 9px 11px;
}

/* ---------- Status / Error ---------- */
.status {
  display: flex; align-items: center; gap: 12px;
  margin-top: 20px; padding: 14px 18px;
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  color: var(--muted);
}
.spinner {
  width: 22px; height: 22px; border-radius: 50%;
  border: 3px solid var(--line); border-top-color: var(--accent);
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.error-box {
  margin-top: 20px; padding: 14px 18px;
  background: rgba(255,107,129,.1); border: 1px solid var(--danger);
  border-radius: 12px; color: #ffd5dc; white-space: pre-wrap;
}

/* ---------- Results ---------- */
.results { margin-top: 28px; }
.results-head { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
.results-head h2 { margin: 0; font-size: 24px; }
.badge {
  background: var(--card-2); border: 1px solid var(--line);
  padding: 4px 12px; border-radius: 999px; font-size: 13px; color: var(--accent-2);
}

.tabs {
  display: flex; gap: 6px; flex-wrap: wrap;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0; margin-bottom: 18px;
}
.tab {
  background: none; border: none; color: var(--muted);
  padding: 10px 14px; cursor: pointer; font-weight: 600; font-size: 14.5px;
  border-bottom: 3px solid transparent; border-radius: 8px 8px 0 0;
  transition: color .12s, border-color .12s, background .12s;
}
.tab:hover { color: var(--text); background: var(--card); }
.tab.active { color: var(--text); border-bottom-color: var(--accent); }
.tab .count {
  display: inline-block; margin-left: 6px; font-size: 11.5px;
  background: var(--card-2); border-radius: 999px; padding: 1px 7px; color: var(--muted);
}

.tab-panel { display: none; animation: fade .2s ease; }
.tab-panel.active { display: block; }
@keyframes fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

/* ---------- Cards inside tabs ---------- */
.item {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 18px;
  margin-bottom: 14px;
}
.item h3 { margin: 0 0 8px; font-size: 17px; }
.item h4 { margin: 14px 0 6px; font-size: 14px; color: var(--accent-2); text-transform: uppercase; letter-spacing: .5px; }
.item .meta { color: var(--muted); font-size: 13px; }

.task-statement {
  background: var(--bg-soft); border-left: 3px solid var(--accent);
  padding: 10px 14px; border-radius: 8px; margin-bottom: 12px;
}

.steps { list-style: none; counter-reset: step; padding: 0; margin: 0; }
.steps li {
  counter-increment: step;
  position: relative; padding: 10px 12px 10px 44px; margin-bottom: 8px;
  background: var(--bg-soft); border-radius: 9px; border: 1px solid var(--line);
}
.steps li::before {
  content: counter(step);
  position: absolute; left: 10px; top: 10px;
  width: 24px; height: 24px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0b0e18; font-weight: 800; font-size: 13px;
  display: grid; place-items: center;
}
.steps .step-text { display: block; }
.steps .expr {
  display: block; text-align: center; overflow-x: auto;
  margin: 8px 0 2px; padding: 8px 10px; font-size: 1.08em;
  background: rgba(108,140,255,0.06); border-radius: 8px;
}

.result-line {
  margin-top: 12px; padding: 10px 14px;
  background: rgba(87,209,168,.1); border: 1px solid var(--accent-2);
  border-radius: 9px; font-weight: 600;
}
.result-line.answer {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  margin-top: 16px; padding: 14px 16px; border-width: 2px;
}
.answer-label {
  flex: 0 0 auto; background: var(--accent-2); color: #06281f;
  padding: 4px 12px; border-radius: 999px; font-weight: 800; font-size: 13.5px;
}
.answer-value { flex: 1; min-width: 0; font-size: 1.12em; }

.formula-block {
  font-size: 18px; padding: 10px 0; text-align: center;
  overflow-x: auto;
}
.chip {
  display: inline-block; background: var(--card-2); border: 1px solid var(--line);
  border-radius: 999px; padding: 3px 11px; font-size: 12.5px; color: var(--muted); margin: 0 6px 6px 0;
}
.tag-row { margin: 2px 0 10px; }
.tag-row .chip { color: var(--accent); border-color: var(--accent); }

/* linki „Co trzeba znać” w egzaminie/kartkówce */
.topic-links { margin: 8px 0 4px; display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.link-chip {
  background: var(--card-2); border: 1px solid var(--accent); color: var(--accent);
  border-radius: 999px; padding: 3px 11px; font-size: 12.5px; cursor: pointer;
  font: inherit; font-size: 12.5px;
}
.link-chip:hover { background: var(--accent); color: #0b0e18; }

/* ---------- Quiz ---------- */
.quiz-best { color: var(--accent-2); margin: 2px 0 10px; }
.quiz-q { background: var(--bg-soft); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; margin-bottom: 10px; }
.quiz-qhead { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.q-num {
  width: 22px; height: 22px; border-radius: 50%; background: var(--card-2);
  display: grid; place-items: center; font-size: 12px; font-weight: 700; color: var(--muted);
}
.q-diff { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .4px; padding: 2px 9px; border-radius: 999px; }
.q-diff.easy { background: rgba(87,209,168,.18); color: var(--accent-2); }
.q-diff.medium { background: rgba(255,180,84,.18); color: var(--warn); }
.q-diff.hard { background: rgba(255,107,129,.18); color: var(--danger); }
.quiz-qtext { font-weight: 600; margin: 0 0 8px; }
.quiz-opt { display: block; cursor: pointer; padding: 5px 0; }
.quiz-opt input { margin-right: 6px; }

.collapsible summary {
  cursor: pointer; font-weight: 700; padding: 4px 0; list-style: none;
}
.collapsible summary::before { content: "▸ "; color: var(--accent); }
.collapsible[open] summary::before { content: "▾ "; }

.lesson { margin-top: 8px; background: var(--bg-soft); border: 1px solid var(--line); border-radius: 9px; padding: 12px 14px; }
.lesson p { margin: 0 0 10px; }
.lesson p:last-child { margin-bottom: 0; }

/* ---------- Ładne treści: akapity, listy, przykłady, wzory ---------- */
.lesson-p { margin: 0 0 10px; line-height: 1.6; }
.lesson-p:last-child { margin-bottom: 0; }

.lesson-list { margin: 6px 0 12px; padding-left: 6px; list-style: none; }
.lesson-list li { position: relative; padding-left: 22px; margin: 6px 0; line-height: 1.55; }
.lesson-list li::before {
  content: "›"; position: absolute; left: 6px; top: 0;
  color: var(--accent); font-weight: 800;
}

/* samodzielny wzór — panel na całą szerokość */
.formula-panel {
  text-align: center; overflow-x: auto;
  margin: 10px 0; padding: 12px 14px; font-size: 1.12em;
  background: rgba(108,140,255,0.07); border: 1px solid var(--line); border-radius: 10px;
}

/* wiersz „tekst → wzór” */
.ex-row {
  display: flex; align-items: center; gap: 14px;
  margin: 8px 0; padding: 10px 12px;
  background: var(--bg-soft); border: 1px solid var(--line);
  border-left: 3px solid var(--accent); border-radius: 10px;
}
.ex-row .ex-left { flex: 1; min-width: 0; color: var(--text); }
.ex-row .ex-right {
  flex: 0 0 auto; min-width: 38%; text-align: center; overflow-x: auto;
  padding: 8px 12px; font-size: 1.1em;
  background: rgba(87,209,168,0.08); border-radius: 8px;
}

/* karta przykładu (gdy linia zaczyna się od „Przykład”) */
.ex-card {
  margin: 10px 0; padding: 12px 14px;
  background: linear-gradient(180deg, rgba(87,209,168,0.06), rgba(87,209,168,0.02));
  border: 1px solid var(--line); border-left: 3px solid var(--accent-2);
  border-radius: 10px;
}
.ex-chip {
  display: inline-block; margin-bottom: 8px;
  background: var(--accent-2); color: #06281f;
  padding: 2px 10px; border-radius: 999px; font-size: 12px; font-weight: 800;
  text-transform: uppercase; letter-spacing: .5px;
}
.ex-card .ex-cols { display: flex; align-items: center; gap: 14px; }
.ex-card .ex-left { flex: 1; min-width: 0; }
.ex-card .ex-right {
  flex: 0 0 auto; min-width: 38%; text-align: center; overflow-x: auto;
  padding: 8px 12px; font-size: 1.12em;
  background: rgba(108,140,255,0.08); border-radius: 8px;
}
.ex-card .ex-body { line-height: 1.6; }

@media (max-width: 560px) {
  .ex-row, .ex-card .ex-cols { flex-direction: column; align-items: stretch; }
  .ex-row .ex-right, .ex-card .ex-right { min-width: 0; }
}

.glossary-grid { display: grid; gap: 10px; }
.glossary-item { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; }
.glossary-item dt { font-weight: 700; color: var(--accent); }
.glossary-item dd { margin: 4px 0 0; color: var(--text); }

.empty { color: var(--muted); font-style: italic; padding: 20px; text-align: center; }

.copy-btn {
  float: right; background: var(--card-2); border: 1px solid var(--line);
  color: var(--muted); border-radius: 8px; padding: 4px 10px; cursor: pointer; font-size: 12px;
}
.copy-btn:hover { color: var(--text); border-color: var(--accent); }

/* ---------- Settings dialog ---------- */
.settings {
  border: 1px solid var(--line); border-radius: 16px; background: var(--card);
  color: var(--text); padding: 0; max-width: 460px; width: 92%; box-shadow: var(--shadow);
}
.settings::backdrop { background: rgba(5,7,15,.6); backdrop-filter: blur(3px); }
.settings form { padding: 22px; display: grid; gap: 16px; }
.settings h2 { margin: 0; }
.settings label { display: grid; gap: 5px; font-weight: 600; font-size: 14px; }
.settings input[type="password"], .settings input[type="text"], .settings select {
  background: var(--bg-soft); color: var(--text); border: 1px solid var(--line);
  border-radius: 10px; padding: 10px 12px; font-size: 14px;
}
.settings small { color: var(--muted); font-weight: 400; }
.settings small a { color: var(--accent); }
.checkbox-row { flex-direction: row; align-items: center; gap: 8px; }
.dialog-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 4px; }

/* ---------- Weryfikacja klucza ---------- */
.verify-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.verify-status { font-size: 13px; color: var(--muted); }
.verify-status.ok { color: var(--accent-2); }
.verify-status.err { color: var(--danger); }
.verify-status.warn { color: var(--warn); }

/* ---------- Animacje (canvas) ---------- */
.anim-details { margin-top: 12px; border-top: 1px dashed var(--line); padding-top: 8px; }
.anim-desc { margin: 4px 0 10px; }
.scene { background: #0b0e18; border: 1px solid var(--line); border-radius: 12px; padding: 8px; }
.scene-canvas { display: block; width: 100%; border-radius: 8px; }
.scene-controls { display: flex; align-items: center; gap: 10px; padding: 8px 4px 2px; }
.scene-btn {
  background: var(--card-2); color: var(--text); border: 1px solid var(--line);
  width: 36px; height: 32px; border-radius: 8px; cursor: pointer; font-size: 15px;
}
.scene-btn:hover { border-color: var(--accent); }
.scene-slider { flex: 1; accent-color: var(--accent); cursor: pointer; }

/* ---------- Koszty ---------- */
.cost-panel { margin-top: 20px; padding: 16px 18px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; }
.cost-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.cost-head h3 { margin: 0; }
.cost-cards { display: flex; gap: 12px; flex-wrap: wrap; }
.cost-card {
  flex: 1; min-width: 180px;
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px;
  display: flex; flex-direction: column; gap: 2px;
}
.cost-label { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .5px; }
.cost-big { font-size: 24px; font-weight: 800; color: var(--accent-2); }
.cost-sub { font-size: 12.5px; color: var(--muted); }
.cost-history { margin-top: 10px; overflow-x: auto; }
.cost-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.cost-table th, .cost-table td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--line); white-space: nowrap; }
.cost-table th { color: var(--muted); font-weight: 600; }
.cost-table td:last-child, .cost-table th:last-child { text-align: right; color: var(--accent-2); }
.cost-note { display: block; margin-top: 10px; color: var(--muted); }

/* ---------- Historia zadań ---------- */
.history-list { display: grid; gap: 8px; }
.history-item {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: 10px; padding: 10px 14px;
}
.history-info { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.history-info strong { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.history-actions { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; }
@media (max-width: 560px) {
  .history-item { flex-direction: column; align-items: flex-start; }
  .history-actions { width: 100%; justify-content: space-between; }
}

/* ---------- Footer ---------- */
.footer { text-align: center; color: var(--muted); font-size: 13px; padding: 24px; border-top: 1px solid var(--line); }

/* ---------- Mobile ---------- */
@media (max-width: 760px) {
  .topbar { padding: 14px 16px; }
  main { padding: 18px 14px 50px; }

  /* poziomy scroll dla zakładek zamiast zawijania */
  .tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    gap: 2px;
  }
  .tabs::-webkit-scrollbar { display: none; }
  .tab { flex: 0 0 auto; padding: 10px 12px; font-size: 14px; }
}

@media (max-width: 560px) {
  .topbar { flex-direction: column; align-items: stretch; gap: 12px; }
  #settingsBtn { align-self: flex-end; }
  .brand { gap: 10px; }
  .logo { width: 44px; height: 44px; font-size: 28px; }
  .topbar h1 { font-size: 19px; }
  .tagline { font-size: 12.5px; }

  .input-card { padding: 14px; }
  .dropzone { padding: 16px; }
  .big-icon { font-size: 32px; }
  .preview img { max-height: 220px; }

  /* przyciski i pola na całą szerokość */
  .input-extras { flex-direction: column; align-items: stretch; }
  .level-label { min-width: 0; }
  .primary-btn.big { width: 100%; }

  .results-head h2 { font-size: 19px; }
  .item { padding: 13px 14px; }
  .item h3 { font-size: 15.5px; }
  .formula-block { font-size: 16px; }

  /* karty umiejętności jedna pod drugą */
  .tab-panel [style*="display:flex"] { flex-direction: column !important; }
  .item[style*="min-width"] { min-width: 0 !important; }

  /* dłuższe pola dotykowe */
  .steps li { padding-left: 42px; }
  .tab { padding: 11px 12px; }
  .copy-btn { float: none; display: inline-block; margin-bottom: 8px; }

  .settings form { padding: 18px; }
  .dialog-actions { flex-direction: column-reverse; }
  .dialog-actions button { width: 100%; }
}

/* zapobiega automatycznemu powiększaniu pól na iOS (font < 16px) */
@media (max-width: 560px) {
  textarea, input, select { font-size: 16px; }
}

/* dostępność: użytkownik prosi o ograniczenie ruchu — wyłącz animacje CSS
   (animacje canvas startują wtedy zatrzymane — patrz animations.js) */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}