:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #1d4ed8;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
}

.topbar {
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  align-items: end;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  background: var(--card);
  position: sticky;
  top: 0;
  z-index: 3;
}
h1 { margin: 0; font-size: 1.2rem; }
.muted { color: var(--muted); margin: .25rem 0 0; }
.controls { display: flex; gap: .5rem; }
input, select {
  border: 1px solid var(--border);
  border-radius: .5rem;
  padding: .5rem .625rem;
  background: #fff;
}

.layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr) 280px;
  gap: 1rem;
  padding: 1rem;
}
.sidebar, .content, .glossary {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: .75rem;
  padding: 1rem;
  min-height: calc(100vh - 120px);
}
.sidebar nav { display: grid; gap: .5rem; }
.module-btn {
  text-align: left;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: .5rem;
  padding: .625rem;
  cursor: pointer;
}
.module-btn.active {
  border-color: var(--accent);
  background: #eff6ff;
}
.module-btn .title { font-weight: 600; display:block; }
.badges { margin-top: .35rem; display: flex; gap: .25rem; flex-wrap: wrap; }
.badge {
  font-size: .72rem;
  color: #1e3a8a;
  background: #dbeafe;
  border-radius: 999px;
  padding: .1rem .45rem;
}
.module-meta h2 { margin: 0 0 .35rem; }
.module-meta p { margin: .2rem 0; }
.tab-nav { display: flex; flex-wrap: wrap; gap: .4rem; margin: .7rem 0; }
.tab-btn {
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 999px;
  padding: .35rem .7rem;
  cursor: pointer;
}
.tab-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
}

.markdown-body h1, .markdown-body h2, .markdown-body h3 { margin-top: 1.1rem; }
.markdown-body p, .markdown-body li { line-height: 1.5; }
.markdown-body code { background: #f3f4f6; padding: 0 .25rem; border-radius: .2rem; }
.markdown-body blockquote {
  border-left: 3px solid #93c5fd;
  padding-left: .75rem;
  color: #1f2937;
}
.compact h1 { font-size: 1.05rem; }
.compact h2 { font-size: .95rem; }

@media (max-width: 1100px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar, .content, .glossary { min-height: auto; }
}