/* ============================================================
   LFZ German Trainer — Shared Styles
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0a0e17;
  --surface: #111827;
  --surface2: #1a2235;
  --border: #1e293b;
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --accent: #38bdf8;
  --accent-dim: #0c4a6e;
  --green: #22c55e;
  --green-dim: #052e16;
  --red: #ef4444;
  --red-dim: #450a0a;
  --purple: #a78bfa;
  --purple-dim: #2e1065;
  --amber: #f59e0b;
}

body {
  font-family: 'DM Sans', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(56,189,248,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(56,189,248,0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 20px 16px;
  position: relative;
  z-index: 1;
}

h1 {
  font-family: 'Space Mono', monospace;
  font-size: 1.4rem;
  text-align: center;
  margin-bottom: 6px;
  color: var(--accent);
}

.subtitle {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  margin-bottom: 20px;
}

/* ============================================================
   Stats Dashboard
   ============================================================ */
.stats {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  margin-bottom: 16px;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 8px;
  text-align: center;
}

.stat-value {
  font-family: 'Space Mono', monospace;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent);
}

.stat-value.green { color: var(--green); }
.stat-value.red { color: var(--red); }
.stat-value.purple { color: var(--purple); }
.stat-value.amber { color: var(--amber); }

.stat-label {
  font-size: 0.65rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 2px;
}

/* ============================================================
   Progress Bar
   ============================================================ */
.progress-wrap {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 14px;
  margin-bottom: 16px;
}

.progress-header {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  margin-bottom: 6px;
  color: var(--text-dim);
}

.progress-bar {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--purple));
  border-radius: 3px;
  transition: width 0.4s ease;
}

/* ============================================================
   Filters
   ============================================================ */
.filters {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.filter-group {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.filter-btn {
  font-family: 'DM Sans', sans-serif;
  font-size: 0.75rem;
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--surface);
  color: var(--text-dim);
  cursor: pointer;
  transition: all 0.2s;
}

.filter-btn:hover { border-color: var(--accent); color: var(--text); }
.filter-btn.active { background: var(--accent-dim); border-color: var(--accent); color: var(--accent); }

select.filter-select {
  font-family: 'DM Sans', sans-serif;
  font-size: 0.75rem;
  padding: 5px 10px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  outline: none;
}

select.filter-select:focus { border-color: var(--accent); }

/* ============================================================
   Question Card
   ============================================================ */
.question-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  margin-bottom: 16px;
}

.q-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.q-number {
  font-family: 'Space Mono', monospace;
  font-size: 0.75rem;
  color: var(--text-dim);
}

.badge {
  font-size: 0.65rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 10px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-a2 { background: var(--accent-dim); color: var(--accent); }
.badge-b1 { background: var(--purple-dim); color: var(--purple); }

.q-category {
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-left: auto;
}

.q-text {
  font-size: 1.15rem;
  line-height: 1.7;
  margin-bottom: 20px;
  font-weight: 500;
}

.q-text .blank {
  display: inline-block;
  min-width: 80px;
  border-bottom: 2px dashed var(--accent);
  margin: 0 2px;
}

/* ============================================================
   Options
   ============================================================ */
.options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.option-btn {
  font-family: 'DM Sans', sans-serif;
  font-size: 1rem;
  padding: 14px 18px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface2);
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 12px;
  text-align: left;
}

.option-btn:hover:not(.disabled) {
  border-color: var(--accent);
  background: var(--accent-dim);
}

.option-key {
  font-family: 'Space Mono', monospace;
  font-size: 0.7rem;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-dim);
  flex-shrink: 0;
}

.option-btn.correct {
  border-color: var(--green);
  background: var(--green-dim);
  color: var(--green);
}

.option-btn.wrong {
  border-color: var(--red);
  background: var(--red-dim);
  color: var(--red);
}

.option-btn.disabled { cursor: default; opacity: 0.6; }
.option-btn.correct.disabled, .option-btn.wrong.disabled { opacity: 1; }

/* ============================================================
   Explanation
   ============================================================ */
.explanation {
  margin-top: 16px;
  padding: 14px;
  background: var(--surface2);
  border-left: 3px solid var(--accent);
  border-radius: 0 8px 8px 0;
  font-size: 0.9rem;
  color: var(--text-dim);
  line-height: 1.6;
  display: none;
}

.explanation.show { display: block; }

/* ============================================================
   Next Button / CTA Button
   ============================================================ */
.next-btn {
  font-family: 'DM Sans', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  width: 100%;
  padding: 14px;
  margin-top: 12px;
  border: none;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--purple));
  color: #fff;
  cursor: pointer;
  display: none;
  transition: opacity 0.2s;
}

.next-btn:hover { opacity: 0.9; }
.next-btn.show { display: block; }

.cta-btn {
  font-family: 'DM Sans', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  display: inline-block;
  padding: 14px 28px;
  margin-top: 20px;
  border: none;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--purple));
  color: #fff;
  cursor: pointer;
  transition: opacity 0.2s;
  text-decoration: none;
  text-align: center;
}

.cta-btn:hover { opacity: 0.9; }
.cta-btn.full-width { width: 100%; display: block; }

/* ============================================================
   Session Summary
   ============================================================ */
.summary-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  margin-bottom: 16px;
  display: none;
}

.summary-card.show { display: block; }

.summary-title {
  font-family: 'Space Mono', monospace;
  font-size: 1.1rem;
  color: var(--accent);
  margin-bottom: 14px;
}

.summary-row {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
}

.summary-row:last-child { border-bottom: none; }

.weak-tag {
  font-size: 0.7rem;
  padding: 1px 6px;
  border-radius: 8px;
  background: var(--red-dim);
  color: var(--red);
  margin-left: 6px;
}

/* ============================================================
   Footer Controls
   ============================================================ */
.footer-controls {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-top: 20px;
  flex-wrap: wrap;
}

.footer-btn {
  font-family: 'DM Sans', sans-serif;
  font-size: 0.75rem;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text-dim);
  cursor: pointer;
  transition: all 0.2s;
}

.footer-btn:hover { border-color: var(--red); color: var(--red); }

.kbd-hint {
  text-align: center;
  font-size: 0.7rem;
  color: var(--text-dim);
  margin-top: 10px;
  opacity: 0.6;
}

/* ============================================================
   End Screen
   ============================================================ */
.end-screen {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 30px;
  text-align: center;
  display: none;
}

.end-screen.show { display: block; }

.end-title {
  font-family: 'Space Mono', monospace;
  font-size: 1.5rem;
  color: var(--accent);
  margin-bottom: 8px;
}

.end-level {
  font-size: 1.2rem;
  margin: 16px 0;
  font-weight: 600;
}

.restart-btn {
  font-family: 'DM Sans', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  padding: 12px 30px;
  border: none;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--purple));
  color: #fff;
  cursor: pointer;
  margin-top: 16px;
}

/* ============================================================
   Animations
   ============================================================ */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.question-card { animation: fadeIn 0.3s ease; }

/* ============================================================
   Navigation Bar (grammar/topic pages)
   ============================================================ */
.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 8px;
}

.nav-link {
  font-family: 'DM Sans', sans-serif;
  font-size: 0.8rem;
  color: var(--text-dim);
  text-decoration: none;
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: all 0.2s;
}

.nav-link:hover { border-color: var(--accent); color: var(--accent); }

.nav-links {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

/* ============================================================
   Topics Grid
   ============================================================ */
.level-section {
  margin-bottom: 28px;
}

.level-heading {
  font-family: 'Space Mono', monospace;
  font-size: 1rem;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.topic-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  text-decoration: none;
  color: var(--text);
  transition: all 0.2s;
  display: block;
}

.topic-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.topic-card .topic-name {
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 4px;
}

.topic-card .topic-name-tr {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 6px;
}

.topic-card .topic-meta {
  font-size: 0.65rem;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ============================================================
   Grammar Page Components
   ============================================================ */
.grammar-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  margin-bottom: 16px;
}

.grammar-section h2 {
  font-family: 'Space Mono', monospace;
  font-size: 0.9rem;
  color: var(--accent);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.rule-box {
  padding: 14px;
  background: var(--surface2);
  border-left: 3px solid var(--amber);
  border-radius: 0 8px 8px 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text);
}

.rule-box strong { color: var(--amber); }

.grammar-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.grammar-table th {
  background: var(--accent-dim);
  color: var(--accent);
  font-weight: 600;
  text-align: left;
  padding: 8px 10px;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.grammar-table td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

.grammar-table tr:last-child td { border-bottom: none; }

.grammar-table .highlight {
  color: var(--green);
  font-weight: 600;
}

.table-wrap {
  overflow-x: auto;
  border-radius: 8px;
  border: 1px solid var(--border);
}

.example-block {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.example-row {
  padding: 10px 14px;
  background: var(--surface2);
  border-radius: 8px;
  border-left: 3px solid var(--accent);
}

.example-de {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 3px;
}

.example-de .blank-answer {
  color: var(--green);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--green);
  text-underline-offset: 3px;
}

.example-tr {
  font-size: 0.8rem;
  color: var(--text-dim);
  font-style: italic;
}

.tip-box {
  padding: 14px;
  background: var(--surface2);
  border-left: 3px solid var(--green);
  border-radius: 0 8px 8px 0;
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--text-dim);
}

.tip-box strong { color: var(--green); }

/* ============================================================
   Exam Report Components
   ============================================================ */
.report-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  margin-bottom: 16px;
}

.report-title {
  font-family: 'Space Mono', monospace;
  font-size: 1.3rem;
  color: var(--accent);
  text-align: center;
  margin-bottom: 6px;
}

.report-score {
  font-family: 'Space Mono', monospace;
  font-size: 2.5rem;
  font-weight: 700;
  text-align: center;
  margin: 16px 0;
}

.report-score.good { color: var(--green); }
.report-score.ok { color: var(--amber); }
.report-score.bad { color: var(--red); }

.report-meta {
  display: flex;
  justify-content: center;
  gap: 20px;
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-bottom: 20px;
}

.report-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  margin-bottom: 8px;
}

.report-item.item-correct { border-left: 3px solid var(--green); }
.report-item.item-wrong { border-left: 3px solid var(--red); }

.report-item .ri-question {
  font-size: 0.9rem;
  margin-bottom: 6px;
}

.report-item .ri-answer {
  font-size: 0.8rem;
  color: var(--text-dim);
}

.report-item .ri-answer .your-pick { color: var(--red); font-weight: 600; }
.report-item .ri-answer .correct-pick { color: var(--green); font-weight: 600; }

.report-actions {
  display: flex;
  gap: 10px;
  margin-top: 20px;
}

.report-actions .cta-btn { flex: 1; }

.weakness-tag {
  display: inline-block;
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 8px;
  background: var(--red-dim);
  color: var(--red);
  font-weight: 600;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 600px) {
  .stats { grid-template-columns: repeat(3, 1fr); }
  .stat-card:nth-child(4), .stat-card:nth-child(5) {
    grid-column: span 1;
  }
  .stats { grid-template-columns: repeat(3, 1fr); }
  h1 { font-size: 1.1rem; }
  .q-text { font-size: 1rem; }
  .option-btn { padding: 12px 14px; font-size: 0.95rem; }
  .question-card { padding: 18px; }
  .topic-grid { grid-template-columns: 1fr; }
  .grammar-section { padding: 16px; }
  .report-actions { flex-direction: column; }
  .report-score { font-size: 2rem; }
}