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

/* ── Layout ──────────────────────────────────────────────── */
body {
  font-family: 'Segoe UI', sans-serif;
  background: #f0f4f8;
  min-height: 100vh;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 32px 16px;
}

.card {
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.10);
  max-width: 820px;
  width: 100%;
  padding: 36px 40px;
}

/* ── Header ──────────────────────────────────────────────── */
h1 {
  font-size: 1.3rem;
  color: #1a237e;
  margin-bottom: 6px;
  letter-spacing: 0.5px;
}

.subtitle {
  font-size: 0.85rem;
  color: #64748b;
  margin-bottom: 24px;
}

/* ── Breadcrumb ──────────────────────────────────────────── */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: #6366f1;
  text-decoration: none;
}

.breadcrumb a:hover { text-decoration: underline; }

.breadcrumb span     { color: #94a3b8; }
.breadcrumb-sep      { color: #cbd5e1; }

/* ── Navigation Cards (index / section pages) ────────────── */
.nav-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 8px;
}

.nav-card {
  display: block;
  padding: 18px 22px;
  border: 2px solid #e2e8f0;
  border-radius: 10px;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.18s, background 0.18s;
}

.nav-card:hover {
  border-color: #6366f1;
  background: #eef2ff;
}

.nav-card-title {
  font-size: 1rem;
  font-weight: 600;
  color: #1e293b;
  margin-bottom: 4px;
}

.nav-card-meta {
  font-size: 0.82rem;
  color: #64748b;
}

/* ── Progress & Navigation ───────────────────────────────── */
.progress {
  font-size: 0.82rem;
  color: #64748b;
  margin-bottom: 20px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.nav button {
  padding: 7px 18px;
  font-size: 0.85rem;
  background: #e2e8f0;
  color: #334155;
}

.nav button:hover:not(:disabled) {
  background: #cbd5e1;
}

/* ── Reading Text ────────────────────────────────────────── */
.text-box {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 20px 24px;
  font-size: 0.95rem;
  line-height: 1.75;
  color: #334155;
  margin-bottom: 28px;
  white-space: pre-wrap;
}

/* ── Question & Options ──────────────────────────────────── */
.question {
  font-size: 1rem;
  font-weight: 600;
  color: #1e293b;
  margin-bottom: 16px;
}

.options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 28px;
}

.option {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 13px 18px;
  border: 2px solid #e2e8f0;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.95rem;
  color: #334155;
  user-select: none;
  transition: border-color 0.18s, background 0.18s;
}

.option:hover:not(.disabled) {
  border-color: #6366f1;
  background: #eef2ff;
}

/* Option states */
.option.selected  { border-color: #6366f1; background: #eef2ff; }
.option.correct   { border-color: #16a34a; background: #f0fdf4; color: #15803d; }
.option.wrong     { border-color: #dc2626; background: #fef2f2; color: #b91c1c; }
.option.disabled  { cursor: default; }

/* Letter badge */
.letter {
  min-width: 26px;
  height: 26px;
  border-radius: 50%;
  background: #e2e8f0;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-weight: 700;
  font-size: 1rem;
  transition: background 0.18s, color 0.18s;
}

.option.selected .letter { background: #6366f1; color: #fff; }
.option.correct  .letter { background: #16a34a; color: #fff; }
.option.wrong    .letter { background: #dc2626; color: #fff; }

/* ── Buttons ─────────────────────────────────────────────── */
button {
  padding: 11px 28px;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.18s;
}

button:disabled { opacity: 0.35; cursor: default; }

/* ── Quiz Footer (submit bar) ────────────────────────────── */
.quiz-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid #e2e8f0;
  flex-wrap: wrap;
  gap: 12px;
}

.answered-count {
  font-size: 0.85rem;
  color: #64748b;
  display: flex;
  align-items: center;
  gap: 6px;
}

#btn-submit {
  background: #6366f1;
  color: #fff;
  padding: 11px 32px;
}

#btn-submit:hover:not(:disabled) { opacity: 0.88; }

.footer-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-nav-icon {
  background: #f1f5f9;
  color: #334155;
  padding: 10px 16px;
  font-size: 1.1rem;
  border-radius: 8px;
  min-width: 44px;
}

.btn-nav-icon:hover:not(:disabled) { background: #e2e8f0; }

/* ── Review dots ─────────────────────────────────────────── */
.dot {
  display: inline-block;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  cursor: pointer;
  transition: transform 0.15s;
}

.dot:hover       { transform: scale(1.25); }
.dot-ok          { background: #16a34a; }
.dot-nok         { background: #dc2626; }
.dot-skip        { background: #94a3b8; }
.dot-active      { outline: 3px solid #6366f1; outline-offset: 2px; }

/* ── Feedback Message ────────────────────────────────────── */
.feedback {
  margin-top: 18px;
  padding: 14px 18px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 500;
  display: none;
}

.feedback.show { display: block; }
.feedback.ok   { background: #f0fdf4; color: #15803d; border: 1px solid #bbf7d0; }
.feedback.nok  { background: #fef2f2; color: #b91c1c; border: 1px solid #fecaca; }

/* ── Score Box ───────────────────────────────────────────── */
#score-box {
  display: none;
  background: #1a237e;
  color: #fff;
  border-radius: 10px;
  padding: 28px 32px;
  text-align: center;
  margin-top: 24px;
}

#score-box h2       { font-size: 1.4rem; margin-bottom: 8px; }
#score-box p        { font-size: 1rem; opacity: 0.85; }
#score-box button   { margin-top: 18px; background: #fff; color: #1a237e; }

/* ── Infotext Accordion Panel (Teil 3) ──────────────────── */
.infotexts-panel {
  border: 1px solid #c7d2fe;
  border-radius: 8px;
  margin: 0 0 20px;
  overflow: hidden;
}
.infotexts-header {
  background: #eef2ff;
  padding: 10px 16px;
  font-weight: 600;
  font-size: 0.85rem;
  color: #4338ca;
  border-bottom: 1px solid #c7d2fe;
  letter-spacing: 0.02em;
}
.infotext-item {
  border-bottom: 1px solid #e0e7ff;
}
.infotext-item:last-child {
  border-bottom: none;
}
.infotext-item summary {
  padding: 9px 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.875rem;
  font-weight: 500;
  color: #334155;
  list-style: none;
  user-select: none;
}
.infotext-item summary::-webkit-details-marker { display: none; }
.infotext-item[open] summary {
  background: #f5f3ff;
  color: #4338ca;
}
.infotext-letter {
  background: #6366f1;
  color: #fff;
  border-radius: 50%;
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  flex-shrink: 0;
}
.infotext-content {
  padding: 10px 16px 14px 50px;
  font-size: 0.84rem;
  color: #475569;
  line-height: 1.65;
  border-top: 1px solid #e0e7ff;
  background: #fafafe;
}

/* ── Author footer ───────────────────────────────────────── */
.author-footer {
  text-align: center;
  font-size: 0.75rem;
  color: #94a3b8;
  padding: 20px 0 4px;
  width: 100%;
}