.main-nav {
  position: sticky;
  top: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.6rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  z-index: 1000;
  overflow: visible;
  isolation: isolate;
}

.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.logo a {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--fg);
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0.35px;
  font-family: "Mali", "IBM Plex Sans", sans-serif;
}

.logo-mark {
  display: block;
  height: 40px;
  width: auto;
  border-radius: 8px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.12);
}

[data-theme="dark"] .logo-mark {
  box-shadow: 0 6px 14px rgba(0, 0, 0, 0.35);
}

@media (max-width: 768px) {
  .logo-mark {
    height: 34px;
  }
}

.main-nav li {
  position: relative;
}

.main-nav .dropdown {
  font-size: smaller;
  position: absolute;
  top: 100%;
  left: 0;
  display: none;
  /* solid background + readable text in both themes */
  background: var(--menu-bg, var(--card));
  color: var(--menu-fg, var(--fg));
  opacity: 1;
  z-index: 1002;
  padding: 0.25rem 0;
  /* Let content wrap and clamp width to viewport */
  width: auto;
  min-width: max-content;
  max-height: 70vh;
  overflow-x: hidden;
  overflow-y: auto;
  border: 1px solid var(--border, #e5e7eb);
  border-radius: 8px;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.12), 0 2px 6px rgba(0, 0, 0, 0.06);
}

/* Dark theme overrides for dropdown */
[data-theme="dark"] .main-nav .dropdown {
  background: #111827; /* slate-900-ish */
  color: #e5e7eb; /* slate-200 */
  border-color: #243241; /* match dark border token */
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.45), 0 2px 8px rgba(0, 0, 0, 0.35);
}
[data-theme="dark"] .main-nav .dropdown li a:hover {
  background: rgba(64, 224, 91, 0.18);
  color: #e5e7eb;
}

.main-nav .dropdown li a {
  display: block;
  padding: 0.5rem 1rem;
  color: inherit; /* follow dropdown text color */
  text-decoration: none;
  /* Allow long names to wrap within the dropdown */
  white-space: normal;
  overflow-wrap: anywhere;
  word-break: break-word;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.main-nav .dropdown li a:hover {
  background: var(--menu-hover-bg, #e6fffb); /* light aqua by default */
  color: var(--menu-hover-fg, #064e3b);
}

.main-nav li:hover > .dropdown {
  display: block;
}

.main-nav > ul > li {
  position: relative;
}

.main-nav li:hover > .dropdown,
.main-nav li.open > .dropdown {
  display: block;
}

main,
.container,
.table-wrap {
  position: relative;
  z-index: 1; /* lower than the main-nav’s 1000+ */
}

.nav-links {
  display: flex;
  gap: 1rem;
}

.nav-links a {
  color: var(--fg);
  text-decoration: none;
  padding: 0.35rem 0.5rem;
  border-radius: 8px;
}

.nav-links a:hover {
  background: var(--card);
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 55px;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 0.5rem;
  }

  .nav-links.open {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding-top: 0.75rem;   /* extra padding above first item */
    padding-bottom: 0.75rem; /* extra padding below last item */
}

  .hamburger {
    display: inline-block;
  }
}