/* ─── Scrollbar ─────────────────────────────── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
#sidebar::-webkit-scrollbar-track { background: #0f172a; }
::-webkit-scrollbar-thumb { background: #475569; border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: #64748b; }

/* ─── Typography ─────────────────────────────── */
body { font-family: 'Inter', system-ui, -apple-system, sans-serif; }

.prose h3 {
  font-size: 1rem;
  font-weight: 700;
  color: #1e293b;
  margin: 1.5rem 0 0.5rem;
}
.prose p { color: #475569; line-height: 1.75; margin-bottom: 0.75rem; }
.prose ul { list-style: none; padding: 0; margin: 0.5rem 0 1rem; }
.prose ul li {
  padding: 0.35rem 0 0.35rem 1.5rem;
  position: relative;
  color: #475569;
  line-height: 1.7;
}
.prose ul li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: #6366f1;
  font-size: 0.75rem;
  top: 0.5rem;
}
.prose code {
  background: #e2e8f0;
  color: #7c3aed;
  padding: 0.1em 0.4em;
  border-radius: 4px;
  font-size: 0.875em;
  font-family: 'Fira Code', 'Cascadia Code', monospace;
}

/* ─── Code Block ─────────────────────────────── */
.code-wrapper { position: relative; }
.code-wrapper pre {
  margin: 0 !important;
  border-radius: 10px !important;
  font-size: 0.82rem !important;
  line-height: 1.65 !important;
}
.code-wrapper pre code { font-family: 'Fira Code', 'Cascadia Code', 'Consolas', monospace !important; }
.copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background: #374151;
  color: #9ca3af;
  border: none;
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 0.7rem;
  cursor: pointer;
  transition: all 0.2s;
  font-family: system-ui, sans-serif;
}
.copy-btn:hover { background: #4b5563; color: #e5e7eb; }
.copy-btn.copied { background: #065f46; color: #6ee7b7; }

/* ─── Sidebar Nav ────────────────────────────── */
.module-btn {
  width: 100%;
  text-align: left;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  color: #94a3b8;
  cursor: pointer;
  transition: all 0.15s;
  background: transparent;
  border: none;
  letter-spacing: 0.01em;
}
.module-btn:hover { background: #1e293b; color: #e2e8f0; }
.module-btn.open { color: #e2e8f0; background: #1e293b; }
.module-btn .chevron { margin-left: auto; transition: transform 0.25s; font-size: 0.65rem; }
.module-btn.open .chevron { transform: rotate(90deg); }

.question-list { overflow: hidden; max-height: 0; transition: max-height 0.3s ease; }
.question-list.open { max-height: 1000px; }

.q-btn {
  width: 100%;
  text-align: left;
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 6px 10px 6px 28px;
  border-radius: 6px;
  font-size: 0.78rem;
  color: #64748b;
  cursor: pointer;
  transition: all 0.15s;
  background: transparent;
  border: none;
  line-height: 1.4;
}
.q-btn:hover { background: #1e293b; color: #cbd5e1; }
.q-btn.active { background: #3730a3; color: #e0e7ff; font-weight: 600; }
.q-btn .q-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #334155;
  flex-shrink: 0;
  margin-top: 5px;
  transition: background 0.15s;
}
.q-btn.active .q-dot { background: #818cf8; }
.q-btn.done .q-dot { background: #34d399; }
.q-btn.done { color: #94a3b8; }

/* ─── Content Card ───────────────────────────── */
.content-card {
  background: white;
  border-radius: 14px;
  border: 1px solid #e2e8f0;
  overflow: hidden;
  box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}

/* ─── Section Label ──────────────────────────── */
.section-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #94a3b8;
  margin-bottom: 0.75rem;
}
.section-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: #e2e8f0;
}

/* ─── Diagram ────────────────────────────────── */
.diagram-wrap {
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  padding: 1.5rem;
}

/* ─── Nav Buttons ────────────────────────────── */
.nav-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: 8px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  border: none;
}
.nav-btn-prev { background: #f1f5f9; color: #64748b; }
.nav-btn-prev:hover { background: #e2e8f0; color: #334155; }
.nav-btn-next { background: #4f46e5; color: white; }
.nav-btn-next:hover { background: #4338ca; }
.nav-btn:disabled { opacity: 0.35; cursor: not-allowed; }

/* ─── Welcome Screen ─────────────────────────── */
.welcome-module-card {
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  padding: 14px 18px;
  background: white;
  transition: all 0.15s;
  cursor: pointer;
}
.welcome-module-card:hover { border-color: #a5b4fc; background: #f5f3ff; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(99,102,241,0.08); }

/* ─── Framework Tabs ─────────────────────────── */
.framework-tab {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 7px 10px;
  border-radius: 8px;
  font-size: 0.78rem;
  font-weight: 600;
  color: #64748b;
  cursor: pointer;
  transition: all 0.15s;
  background: transparent;
  border: 1px solid transparent;
}
.framework-tab:hover { background: #1e293b; color: #cbd5e1; }
#tab-angular.active  { background: #3b1010; color: #fca5a5; border-color: #b91c1c; }
#tab-react.active    { background: #082f3f; color: #67e8f9; border-color: #0e7490; }

/* ─── Highlight.js override ──────────────────── */
.hljs { background: #1a1d2e !important; }