/* ── BC1 Klausur-Analyse – Dark Theme ─────────────────────────────────────── */
:root {
  --bg: #0f1117; --card: #1a1d27; --border: #2a2d3a;
  --text: #e4e4e7; --muted: #9ca3af;
  --accent: #818cf8; --accent2: #34d399;
  --warn: #f59e0b; --danger: #ef4444;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; background: var(--bg); color: var(--text); line-height: 1.5; }
.container { max-width: 1200px; margin: 0 auto; padding: 20px; }
h1 { font-size: 1.8rem; margin-bottom: 4px; }
.subtitle { color: var(--muted); margin-bottom: 24px; font-size: 0.9rem; }

/* Stats row */
.stats-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 12px; margin-bottom: 24px; }
.stat-card { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 16px; }
.stat-card .label { color: var(--muted); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; }
.stat-card .value { font-size: 1.8rem; font-weight: 700; color: var(--accent); }

/* Tabs */
.tabs { display: flex; gap: 4px; margin-bottom: 20px; flex-wrap: wrap; }
.tab { padding: 8px 16px; border-radius: 8px; border: 1px solid var(--border); background: var(--card); color: var(--muted); cursor: pointer; font-size: 0.85rem; transition: all 0.2s; }
.tab:hover { border-color: var(--accent); color: var(--text); }
.tab.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.panel { display: none; }
.panel.active { display: block; }

/* Cards & Tables */
.card { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 20px; margin-bottom: 16px; }
.card h2 { font-size: 1.1rem; margin-bottom: 12px; }
table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
th, td { padding: 8px 12px; text-align: left; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; text-transform: uppercase; font-size: 0.7rem; letter-spacing: 0.05em; position: sticky; top: 0; background: var(--card); }
tr:hover { background: rgba(129,140,248,0.05); }

/* Bars & Badges */
.bar-container { display: flex; align-items: center; gap: 8px; }
.bar { height: 20px; border-radius: 4px; background: var(--accent); min-width: 2px; transition: width 0.3s; }
.bar.high { background: var(--danger); }
.bar.medium { background: var(--warn); }
.bar.low { background: var(--accent2); }
.badge { display: inline-block; padding: 2px 8px; border-radius: 12px; font-size: 0.7rem; font-weight: 600; }
.badge.hot { background: rgba(239,68,68,0.15); color: var(--danger); }
.badge.warm { background: rgba(245,158,11,0.15); color: var(--warn); }
.badge.cool { background: rgba(52,211,153,0.15); color: var(--accent2); }

/* Heatmap */
.heatmap { display: grid; gap: 2px; font-size: 0.65rem; }
.heatmap-cell { padding: 6px 4px; text-align: center; border-radius: 4px; min-width: 40px; }
.heatmap-header { color: var(--muted); font-weight: 600; font-size: 0.65rem; padding: 4px; text-align: center; }
.heatmap-label { color: var(--text); font-size: 0.7rem; padding: 6px 8px; text-align: right; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 200px; }

/* Prediction */
.prob { font-size: 1.4rem; font-weight: 700; }
.prob-row { display: flex; align-items: center; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--border); }
.prob-row:last-child { border-bottom: none; }
.prob-name { flex: 1; font-size: 0.85rem; }
.prob-bar-bg { flex: 2; height: 8px; background: var(--border); border-radius: 4px; overflow: hidden; }
.prob-bar-fill { height: 100%; border-radius: 4px; transition: width 0.5s; }

/* Filters & Inputs */
.filter-row { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; align-items: center; }
.filter-row label { color: var(--muted); font-size: 0.8rem; }
.filter-row select, select { background: var(--card); color: var(--text); border: 1px solid var(--border); padding: 6px 10px; border-radius: 6px; font-size: 0.8rem; }
.search-input { background: var(--card); color: var(--text); border: 1px solid var(--border); padding: 8px 12px; border-radius: 6px; font-size: 0.85rem; width: 250px; }
.search-input::placeholder { color: var(--muted); }

/* Question cards */
.question-card { background: rgba(129,140,248,0.05); border: 1px solid var(--border); border-radius: 8px; padding: 12px; margin-bottom: 8px; font-size: 0.82rem; }
.question-card .q-meta { color: var(--muted); font-size: 0.7rem; margin-bottom: 4px; }
.question-card .q-concept { display: inline-block; background: rgba(129,140,248,0.12); color: var(--accent); padding: 1px 6px; border-radius: 4px; font-size: 0.7rem; margin-top: 4px; }

/* PDF Export */
.pdf-options { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 16px; align-items: center; }
.pdf-options label { color: var(--muted); font-size: 0.82rem; display: flex; align-items: center; gap: 6px; cursor: pointer; }
.pdf-options input[type="checkbox"] { accent-color: var(--accent); width: 16px; height: 16px; }
.btn-pdf { background: var(--accent); color: #fff; border: none; padding: 10px 24px; border-radius: 8px; font-size: 0.9rem; font-weight: 600; cursor: pointer; transition: all 0.2s; }
.btn-pdf:hover { opacity: 0.85; transform: translateY(-1px); }

/* ── Lerntexte Tab ────────────────────────────────────────────────────────── */
.lt-layout { display: grid; grid-template-columns: 260px 1fr; gap: 16px; min-height: 500px; }
@media (max-width: 900px) { .lt-layout { grid-template-columns: 1fr; } }

.lt-sidebar { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 12px; max-height: 700px; overflow-y: auto; }
.lt-sidebar-title { font-size: 0.75rem; text-transform: uppercase; color: var(--muted); letter-spacing: 0.05em; margin-bottom: 10px; font-weight: 600; }

.lt-concept-item { padding: 8px 10px; border-radius: 6px; cursor: pointer; margin-bottom: 4px; display: flex; justify-content: space-between; align-items: center; font-size: 0.82rem; transition: all 0.15s; border: 1px solid transparent; }
.lt-concept-item:hover { background: rgba(129,140,248,0.08); border-color: var(--border); }
.lt-concept-item.active { background: rgba(129,140,248,0.15); border-color: var(--accent); color: #fff; }
.lt-concept-item .lt-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lt-concept-item .lt-badge { font-size: 0.65rem; padding: 1px 6px; border-radius: 8px; margin-left: 6px; flex-shrink: 0; }
.lt-badge.generated { background: rgba(52,211,153,0.15); color: var(--accent2); }
.lt-badge.not-generated { background: rgba(156,163,175,0.15); color: var(--muted); }
.lt-concept-item .lt-count { color: var(--muted); font-size: 0.7rem; margin-left: 4px; flex-shrink: 0; }

.lt-main { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 20px; }

.lt-toolbar { display: flex; gap: 10px; align-items: center; margin-bottom: 16px; flex-wrap: wrap; }
.lt-toolbar select { background: var(--bg); color: var(--text); border: 1px solid var(--border); padding: 6px 10px; border-radius: 6px; font-size: 0.82rem; }
.btn-generate { background: var(--accent2); color: #000; border: none; padding: 8px 20px; border-radius: 8px; font-size: 0.85rem; font-weight: 600; cursor: pointer; transition: all 0.2s; }
.btn-generate:hover { opacity: 0.85; }
.btn-generate:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-regenerate { background: var(--warn); color: #000; border: none; padding: 8px 16px; border-radius: 8px; font-size: 0.82rem; font-weight: 600; cursor: pointer; transition: all 0.2s; }
.btn-regenerate:hover { opacity: 0.85; }

.lt-header { font-size: 1.2rem; font-weight: 700; margin-bottom: 4px; }
.lt-subheader { color: var(--muted); font-size: 0.8rem; margin-bottom: 16px; }

/* Study text content */
.lt-content { line-height: 1.7; font-size: 0.92rem; }
.lt-content h2 { font-size: 1.1rem; color: var(--accent); margin: 20px 0 8px 0; padding-bottom: 4px; border-bottom: 1px solid var(--border); }
.lt-content h3 { font-size: 0.95rem; color: var(--accent2); margin: 14px 0 6px 0; }
.lt-content p { margin-bottom: 10px; }
.lt-content ul, .lt-content ol { margin: 8px 0 12px 20px; }
.lt-content li { margin-bottom: 4px; }
.lt-content strong { color: #fff; }
.lt-content code { background: rgba(129,140,248,0.1); padding: 1px 4px; border-radius: 3px; font-size: 0.85em; }

.lt-placeholder { text-align: center; padding: 60px 20px; color: var(--muted); }
.lt-placeholder .lt-placeholder-icon { font-size: 3rem; margin-bottom: 12px; }

/* Usage info bar */
.lt-usage { display: flex; gap: 16px; flex-wrap: wrap; padding: 10px 14px; background: rgba(129,140,248,0.06); border: 1px solid var(--border); border-radius: 8px; margin-bottom: 16px; font-size: 0.75rem; color: var(--muted); }
.lt-usage span { display: flex; align-items: center; gap: 4px; }
.lt-usage .lt-cost { color: var(--accent2); font-weight: 600; }

/* Version history */
.lt-history { margin-top: 20px; border-top: 1px solid var(--border); padding-top: 12px; }
.lt-history-title { font-size: 0.8rem; color: var(--muted); margin-bottom: 8px; cursor: pointer; user-select: none; }
.lt-history-title:hover { color: var(--text); }
.lt-history-list { display: none; }
.lt-history-list.open { display: block; }
.lt-history-item { display: flex; justify-content: space-between; align-items: center; padding: 6px 10px; border-radius: 6px; font-size: 0.78rem; cursor: pointer; margin-bottom: 2px; border: 1px solid transparent; }
.lt-history-item:hover { background: rgba(129,140,248,0.06); border-color: var(--border); }
.lt-history-item.active { border-color: var(--accent); }

/* Loading spinner */
.lt-loading { text-align: center; padding: 40px; }
.spinner { display: inline-block; width: 32px; height: 32px; border: 3px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Print Preview Panel (slide-in from right) ───────────────────────────── */
.pp-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,0.35); z-index: 999; opacity: 0; pointer-events: none; transition: opacity 0.25s ease; }
.pp-backdrop.open { opacity: 1; pointer-events: auto; }

.pp-panel { position: fixed; top: 0; right: 0; bottom: 0; width: 75vw; max-width: 1200px; min-width: 400px; z-index: 1000; background: var(--card); border-left: 1px solid var(--border); box-shadow: -8px 0 40px rgba(0,0,0,0.5); display: flex; flex-direction: column; transform: translateX(100%); transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1); }
.pp-panel.open { transform: translateX(0); }

.pp-topbar { display: flex; align-items: center; justify-content: space-between; padding: 14px 18px; border-bottom: 1px solid var(--border); gap: 10px; flex-shrink: 0; }
.pp-topbar h2 { margin: 0; font-size: 1rem; white-space: nowrap; }
.pp-controls { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.pp-controls label { color: var(--muted); font-size: 0.78rem; display: flex; align-items: center; gap: 4px; }
.pp-controls select { background: var(--bg); color: var(--text); border: 1px solid var(--border); padding: 4px 8px; border-radius: 6px; font-size: 0.78rem; }
.pp-close { background: none; border: 1px solid var(--border); color: var(--muted); font-size: 1.3rem; width: 30px; height: 30px; border-radius: 6px; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all 0.15s; flex-shrink: 0; }
.pp-close:hover { background: var(--danger); color: #fff; border-color: var(--danger); }

.pp-actions { padding: 12px 18px; border-bottom: 1px solid var(--border); display: flex; gap: 12px; align-items: center; flex-shrink: 0; flex-wrap: wrap; }
.pp-font-control { display: flex; align-items: center; gap: 6px; color: var(--muted); font-size: 0.78rem; }
.pp-font-control input[type="range"] { width: 100px; accent-color: var(--accent); cursor: pointer; }
.pp-font-control input[type="range"].wide { width: 400px; }
.pp-font-label { min-width: 36px; text-align: center; color: var(--text); font-weight: 600; font-size: 0.78rem; }
.pp-page-count { margin-left: auto; color: var(--muted); font-size: 0.78rem; }

.pp-scroll { flex: 1; overflow-y: auto; background: #12121f; }
.pp-page { background: #fff; color: #000; border-radius: 3px; box-shadow: 0 2px 16px rgba(0,0,0,0.5); font-family: Georgia, 'Times New Roman', serif; overflow: hidden; }

/* ── Print / PDF ──────────────────────────────────────────────────────────── */
.pdf-preview { margin-top: 16px; border: 1px solid var(--border); border-radius: 8px; max-height: 500px; overflow-y: auto; padding: 20px; background: #fff; color: #000; font-size: 0.82rem; }
#pdf-print-area { display: none; }

@media print {
  body { background: #fff !important; color: #000 !important; font-size: 10pt; }
  .container { display: none !important; }
  .pp-backdrop, .pp-panel { display: none !important; }
  #pdf-print-area { display: block !important; }
  .pdf-page { page-break-after: always; padding: 0; margin: 0; }
  .pdf-page:last-child { page-break-after: avoid; }
  .pdf-page-header { font-size: 14pt; font-weight: 700; margin-bottom: 4pt; color: #000; }
  .pdf-page-sub { font-size: 9pt; color: #666; margin-bottom: 12pt; border-bottom: 1.5pt solid #000; padding-bottom: 6pt; }
  .pdf-section { margin-bottom: 10pt; }
  .pdf-section-title { font-size: 11pt; font-weight: 700; color: #333; margin-bottom: 4pt; border-bottom: 0.5pt solid #999; padding-bottom: 2pt; }
  .pdf-q { padding: 3pt 0 3pt 8pt; border-left: 2pt solid #818cf8; margin-bottom: 5pt; font-size: 9.5pt; line-height: 1.4; }
  .pdf-q .pdf-qnr { font-weight: 700; color: #333; }
  .pdf-q .pdf-concept-tag { display: inline-block; background: #eef; color: #555; font-size: 7.5pt; padding: 0 4pt; border-radius: 2pt; margin-left: 4pt; }
  .pdf-footer { text-align: center; font-size: 7.5pt; color: #aaa; margin-top: 14pt; }

  /* Lerntext print styles — only the LLM body text */
  .lt-print { font-family: 'Georgia', 'Times New Roman', serif; color: #000; }
  .lt-print-body { font-size: 10.5pt; line-height: 1.6; }
  .lt-print-body h1 { font-size: 16pt; color: #000; margin: 18pt 0 8pt 0; border-bottom: 1pt solid #ccc; padding-bottom: 4pt; }
  .lt-print-body h2 { font-size: 13pt; color: #222; margin: 16pt 0 6pt 0; border-bottom: 0.5pt solid #ddd; padding-bottom: 3pt; }
  .lt-print-body h3 { font-size: 11pt; color: #444; margin: 12pt 0 4pt 0; }
  .lt-print-body p { margin-bottom: 8pt; text-align: justify; }
  .lt-print-body ul, .lt-print-body ol { margin: 6pt 0 10pt 18pt; }
  .lt-print-body li { margin-bottom: 3pt; }
  .lt-print-body strong { font-weight: 700; }
  .lt-print-body em { font-style: italic; }
  .lt-print-body code { font-family: 'Courier New', monospace; font-size: 9.5pt; background: #f0f0f0; padding: 1pt 3pt; border-radius: 2pt; }

  @page { size: A4; margin: 20mm 18mm 20mm 18mm; }
}

@media (max-width: 768px) {
  .heatmap-label { max-width: 100px; }
  .container { padding: 12px; }
}