/* Shared Navigation & Global Style Tokens for DSA Interactive Lab */
:root {
  --bg-white: #FFFFFF;
  --title-charcoal: #1E2022;
  --body-offblack: #2B2D42;
  --primary-accent: #003366;
  --primary-accent-hover: #002244;
  --secondary-green: #1E5631;
  --secondary-red: #8B0000;
  --border-line: #1E2022;
  --border-subtle: #D8DEE4;
  --highlight-bg: #F0F4F8;
  --panel-bg: #F8FAFC;
  --state-active: #003366;
  --state-target: #D97706;
}

.course-nav {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto 1.75rem auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 0.6rem 0 1rem 0;
  border-bottom: 1.5px solid var(--border-line);
  font-family: 'Montserrat', system-ui, -apple-system, sans-serif;
}

.course-nav .nav-brand {
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--primary-accent);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: opacity 0.15s ease;
}

.course-nav .nav-brand:hover {
  opacity: 0.85;
}

.course-nav .nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
}

.course-nav .nav-links a {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.35rem 0.65rem;
  border-radius: 4px;
  border: 1px solid var(--border-subtle);
  background: var(--bg-white);
  color: var(--body-offblack);
  text-decoration: none;
  transition: all 0.15s ease;
}

.course-nav .nav-links a:hover {
  background: var(--highlight-bg);
  border-color: var(--primary-accent);
  color: var(--primary-accent);
}

.course-nav .nav-links a.active {
  background: var(--primary-accent);
  border-color: var(--primary-accent);
  color: #ffffff;
}

@media (max-width: 768px) {
  .course-nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.6rem;
  }
}