/* Shared base (light) styles for header, nav, and toggle */

header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid rgba(21, 57, 68, 0.08);
  box-shadow: 0 6px 22px rgba(21, 57, 68, 0.08);
  padding: 4px 0;
}

.nav-bar {
  max-width: 1200px;
  margin: 0 auto;
  padding: 8px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  position: relative;
  display: flex;
  align-items: center;
  gap: 24px;
  flex: 1 1 auto;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.brand-title {
  font-size: 2.4rem;
  font-weight: 700;
  color: #0e2d34;
  line-height: 1;
  margin-left: 260px;
  margin-bottom: 10px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 16px;
  font-weight: 500;
  color: rgba(21, 57, 68, 0.75);
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  margin-left: auto;
  margin-right: 10px; /* nudge About pill left 10px */
}

/* Ensure nav links are pill buttons without underlines */
.nav-menu a,
.nav-menu a:link,
.nav-menu a:visited,
.nav-menu a:hover,
.nav-menu a:active,
.nav-menu a:focus {
  padding: 8px 14px;
  border-radius: 999px;
  transition: background 0.2s ease, box-shadow 0.2s ease, color 0.2s ease;
  color: inherit;
  text-decoration: none;
}

/* Give About pill 10px extra right padding */
.nav-menu a[data-anchor] { padding: 8px 24px; }

.nav-menu a:hover,
.nav-menu a.active {
  background: rgba(200, 240, 223, 0.5);
  color: #0e2d34;
  box-shadow: 0 10px 20px rgba(126, 203, 160, 0.25);
}

.mode-toggle {
  border: 1px solid rgba(21, 57, 68, 0.2);
  background: rgba(255, 255, 255, 0.85);
  color: #0e2d34;
  border-radius: 999px;
  padding: 6px 18px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.mode-toggle:hover {
  background: rgba(21, 57, 68, 0.12);
  box-shadow: 0 10px 20px rgba(21, 57, 68, 0.12);
}

.mode-toggle::before {
  content: 'Mode';
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.mode-toggle::after { content: "🌙"; }

/* Footer placement for mode toggle */
footer .footer-controls {
  display: flex;
  justify-content: center;
  margin-top: 10px;
  margin-bottom: 0;
}

/* Mobile header alignment tweaks */
@media (max-width: 768px) {
  .nav-bar { flex-wrap: wrap; align-items: flex-start; }
  /* Keep title clear of the overlapping logo */
  .brand { padding-left: 260px; min-height: 72px; }
  .brand-title { margin-left: 0; font-size: 2rem; line-height: 1.1; }
  .nav-menu { margin-left: auto; }
}