/* ============ FJP_LEARN – shared styles ============ */

:root {
  /* Light theme (default) */
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-2: #f1f5f9;
  --border: #e2e8f0;
  --text: #1e293b;
  --text-muted: #64748b;
  --text-strong: #0f172a;
  --accent: #2563eb;
  --accent-light: #dbeafe;
  --code-bg: #f1f5f9;
  --code-text: #be185d;
  --pre-bg: #1e293b;
  --pre-text: #e2e8f0;
  --success: #16a34a;
  --warn: #ea580c;
  --danger: #dc2626;
  --info-skripta: #2563eb;
  --info-extra: #7c3aed;
  --info-tip: #ca8a04;
  --info-warn: #dc2626;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 4px 12px rgba(0,0,0,0.04);
}

body.dark {
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-2: #334155;
  --border: #334155;
  --text: #cbd5e1;
  --text-muted: #94a3b8;
  --text-strong: #f1f5f9;
  --accent: #60a5fa;
  --accent-light: #1e3a8a;
  --code-bg: #0f172a;
  --code-text: #fbbf24;
  --pre-bg: #0f172a;
  --pre-text: #cbd5e1;
  --info-skripta: #60a5fa;
  --info-extra: #a78bfa;
  --info-tip: #fcd34d;
  --info-warn: #f87171;
  --shadow: 0 1px 3px rgba(0,0,0,0.3), 0 4px 12px rgba(0,0,0,0.2);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ============ TOP BAR ============ */

header.topbar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 12px 20px;
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  box-shadow: var(--shadow);
}
.topbar .logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-strong);
  text-decoration: none;
}
.topbar .logo:hover { color: var(--accent); }
.topbar nav {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  flex: 1;
}
.topbar nav a {
  text-decoration: none;
  color: var(--text-muted);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.85rem;
  transition: all 0.15s;
}
.topbar nav a:hover { background: var(--surface-2); color: var(--text); }
.topbar nav a.active { background: var(--accent); color: white; font-weight: 600; }
.topbar .actions { display: flex; gap: 8px; align-items: center; }
.topbar button.icon-btn {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.15s;
}
.topbar button.icon-btn:hover { background: var(--accent); color: white; border-color: var(--accent); }

/* ============ TABS ============ */

.tabs {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 4px;
  padding: 0 20px;
  position: sticky;
  top: 58px;
  z-index: 50;
}
.tabs button {
  background: transparent;
  border: none;
  padding: 12px 20px;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  margin-bottom: -1px;
  transition: all 0.15s;
}
.tabs button:hover { color: var(--text); }
.tabs button.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
  font-weight: 600;
}

/* ============ FILTERS BAR (for otazky) ============ */

.filters {
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  padding: 10px 20px;
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.filters .progress {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  color: var(--text);
}
.filters .progress-bar {
  width: 120px;
  height: 8px;
  background: var(--border);
  border-radius: 4px;
  overflow: hidden;
}
.filters .progress-bar-fill {
  height: 100%;
  background: var(--success);
  transition: width 0.3s;
}
.filters label {
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
}
.filters label input { cursor: pointer; }
.filters button.text-btn {
  background: transparent;
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 6px;
  color: var(--text);
  font-size: 0.8rem;
  cursor: pointer;
}
.filters button.text-btn:hover { background: var(--surface); }

/* ============ MAIN LAYOUT ============ */

.layout {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 28px;
  padding: 24px 20px;
}
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .toc { position: static !important; max-height: none !important; }
}

.toc {
  position: sticky;
  top: 110px;
  align-self: flex-start;
  max-height: calc(100vh - 130px);
  overflow-y: auto;
  font-size: 0.85rem;
  padding-right: 8px;
}
.toc h3 {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.toc ul { list-style: none; }
.toc ul ul { padding-left: 12px; margin-top: 2px; }
.toc a {
  display: block;
  padding: 4px 8px;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: 4px;
  border-left: 2px solid transparent;
}
.toc a:hover { background: var(--surface); color: var(--text); }
.toc a.active { color: var(--accent); border-left-color: var(--accent); background: var(--accent-light); }

.content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px 36px;
  box-shadow: var(--shadow);
  min-width: 0;
}
@media (max-width: 600px) { .content { padding: 20px 16px; } }

/* ============ TYPOGRAPHY ============ */

.content h1 {
  font-size: 1.8rem;
  margin-bottom: 16px;
  color: var(--text-strong);
  font-weight: 700;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border);
}
.content h2 {
  font-size: 1.4rem;
  margin-top: 32px;
  margin-bottom: 12px;
  color: var(--text-strong);
  font-weight: 700;
  scroll-margin-top: 120px;
}
.content h3 {
  font-size: 1.15rem;
  margin-top: 24px;
  margin-bottom: 10px;
  color: var(--text-strong);
  font-weight: 600;
  scroll-margin-top: 120px;
}
.content h4 {
  font-size: 1rem;
  margin-top: 16px;
  margin-bottom: 8px;
  color: var(--text-strong);
  font-weight: 600;
}
.content p { margin-bottom: 12px; }
.content ul, .content ol { margin-bottom: 14px; padding-left: 24px; }
.content li { margin-bottom: 4px; }
.content li > ul, .content li > ol { margin-top: 4px; margin-bottom: 4px; }
.content strong { color: var(--text-strong); font-weight: 700; }
.content em { font-style: italic; }
.content a { color: var(--accent); text-decoration: none; border-bottom: 1px solid transparent; }
.content a:hover { border-bottom-color: var(--accent); }

.content code {
  background: var(--code-bg);
  color: var(--code-text);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: "SF Mono", Monaco, "Cascadia Code", Consolas, monospace;
  font-size: 0.9em;
  word-wrap: break-word;
}
.content pre {
  background: var(--pre-bg);
  color: var(--pre-text);
  padding: 16px 20px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 14px 0;
  font-family: "SF Mono", Monaco, "Cascadia Code", Consolas, monospace;
  font-size: 0.88em;
  line-height: 1.5;
}
.content pre code {
  background: transparent;
  color: inherit;
  padding: 0;
  font-size: inherit;
}

.content blockquote {
  border-left: 4px solid var(--accent);
  padding: 8px 16px;
  margin: 16px 0;
  background: var(--surface-2);
  border-radius: 0 8px 8px 0;
  color: var(--text);
}
.content blockquote p:last-child { margin-bottom: 0; }

.content hr {
  border: none;
  border-top: 2px solid var(--border);
  margin: 28px 0;
}

/* Tables */
.content table {
  width: 100%;
  border-collapse: collapse;
  margin: 14px 0;
  font-size: 0.92rem;
  display: block;
  overflow-x: auto;
}
.content table thead { background: var(--surface-2); }
.content table th, .content table td {
  padding: 10px 14px;
  border: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}
.content table th { font-weight: 600; color: var(--text-strong); }
.content table tbody tr:nth-child(even) { background: var(--surface-2); }

/* Task list (- [ ] item) */
.content ul.task-list { list-style: none; padding-left: 0; }
.content ul.task-list li { padding-left: 28px; position: relative; }
.content ul.task-list li::before {
  content: "☐";
  position: absolute;
  left: 4px;
  color: var(--text-muted);
}
.content ul.task-list li.checked::before { content: "✓"; color: var(--success); }

/* ============ COLLAPSIBLE OTAZKY ============ */

.otazka {
  border: 1px solid var(--border);
  border-radius: 10px;
  margin: 16px 0;
  background: var(--surface);
  overflow: hidden;
  transition: border-color 0.15s;
}
.otazka.umim { border-color: var(--success); background: rgba(22, 163, 74, 0.04); }
body.dark .otazka.umim { background: rgba(22, 163, 74, 0.08); }

.otazka-header {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 20px;
  cursor: pointer;
  background: var(--surface-2);
  user-select: none;
  transition: background 0.15s;
}
.otazka-header:hover { background: var(--border); }
.otazka-header .num {
  font-weight: 700;
  color: var(--accent);
  flex-shrink: 0;
  font-size: 1rem;
  min-width: 28px;
}
.otazka-header .text {
  flex: 1;
  font-weight: 600;
  color: var(--text-strong);
  font-size: 1rem;
}
.otazka-header .text p { margin: 0; }
.otazka-header .chev {
  flex-shrink: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
  transition: transform 0.2s;
}
.otazka.open .otazka-header .chev { transform: rotate(180deg); }

.otazka-body {
  padding: 20px 24px;
  display: none;
  border-top: 1px solid var(--border);
  background: var(--surface);
}
.otazka.open .otazka-body { display: block; }
.otazka-body > *:first-child { margin-top: 0; }
.otazka-body > *:last-child { margin-bottom: 0; }

.otazka-actions {
  display: flex;
  gap: 8px;
  padding: 12px 20px;
  border-top: 1px solid var(--border);
  background: var(--surface-2);
  font-size: 0.85rem;
  align-items: center;
}
.otazka-actions label {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  color: var(--text-muted);
  font-weight: 500;
}
.otazka-actions label.checked { color: var(--success); font-weight: 600; }
.otazka-actions input { cursor: pointer; width: 16px; height: 16px; }

.otazka.hidden { display: none; }

/* ============ STATUS / SEARCH HIGHLIGHT ============ */

.no-results {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
  font-size: 1.05rem;
}

mark.search-hit {
  background: #fef08a;
  color: #422006;
  padding: 1px 2px;
  border-radius: 2px;
}
body.dark mark.search-hit {
  background: #ca8a04;
  color: #1e293b;
}

/* ============ INDEX (homepage) cards ============ */

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin: 24px 0;
}
.card-link {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  text-decoration: none;
  color: var(--text);
  box-shadow: var(--shadow);
  transition: all 0.15s;
}
.card-link:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.15);
}
.card-link .num {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
}
.card-link .title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-strong);
  margin: 6px 0;
}
.card-link .desc {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.special-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin: 24px 0;
}
.special-card {
  display: block;
  background: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
  color: white;
  border-radius: 12px;
  padding: 24px;
  text-decoration: none;
  box-shadow: var(--shadow);
  transition: all 0.15s;
}
.special-card:hover { transform: translateY(-2px); box-shadow: 0 6px 16px rgba(124, 58, 237, 0.3); }
.special-card .icon { font-size: 2rem; }
.special-card .title { font-size: 1.2rem; font-weight: 700; margin: 8px 0 4px; }
.special-card .desc { font-size: 0.85rem; opacity: 0.9; }

/* ============ PRINT ============ */

@media print {
  header.topbar, .tabs, .filters, .toc, .otazka-actions { display: none !important; }
  .layout { display: block; padding: 0; }
  .content { border: none; box-shadow: none; padding: 0; }
  .otazka, .otazka.umim { border: 1px solid #ccc; page-break-inside: avoid; }
  .otazka-body { display: block !important; }
  .otazka-header { background: #f5f5f5; cursor: default; }
  .otazka-header .chev { display: none; }
  body { background: white; color: black; }
}