/* ══════════════════════════════════════════
   NAV — Shared navigation with dropdown menus
══════════════════════════════════════════ */

nav {
  position: sticky; top: 0; z-index: 200;
  background: var(--white);
  border-bottom: 1px solid var(--rule);
  padding: 0 48px;
  height: 56px;
  display: flex; align-items: center; justify-content: space-between;
}

.nav-logo {
  display: flex; align-items: baseline; gap: 10px;
  text-decoration: none;
}
.nav-logo-mark {
  font-family: var(--mono); font-size: 11px; font-weight: 500;
  color: var(--accent); letter-spacing: 0.08em;
  border: 1px solid var(--accent);
  padding: 2px 7px; border-radius: 2px;
}
.nav-logo-name {
  font-family: var(--sans); font-size: 13px; font-weight: 700;
  color: var(--ink); letter-spacing: 0.04em; text-transform: uppercase;
}

.nav-links { display: flex; align-items: center; gap: 0; }
.nav-link {
  font-family: var(--mono); font-size: 11px; font-weight: 400;
  color: var(--ink3); text-decoration: none;
  padding: 0 16px; height: 56px;
  display: flex; align-items: center;
  letter-spacing: 0.04em;
  transition: color 0.15s, background 0.15s;
}
.nav-link:hover { color: var(--ink); background: var(--bg); }
.nav-link.active {
  color: var(--accent);
  background: rgba(0,71,255,0.05);
}

/* Dropdown arrow */
.nav-arrow {
  font-size: 9px; margin-left: 4px;
  transition: transform 0.15s;
}

/* ── Dropdown ── */
.nav-dropdown {
  position: relative;
}
.nav-dropdown-toggle {
  cursor: pointer;
}
.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: 56px; left: 0;
  min-width: 200px;
  background: var(--white);
  border: 1px solid var(--rule);
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
  z-index: 300;
}
.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown.open .nav-dropdown-menu {
  display: block;
}
.nav-dropdown:hover .nav-arrow {
  transform: rotate(180deg);
}
.nav-dropdown-link {
  display: block;
  font-family: var(--mono); font-size: 11px;
  color: var(--ink3); text-decoration: none;
  padding: 12px 20px;
  letter-spacing: 0.04em;
  transition: color 0.15s, background 0.15s;
  border-bottom: 1px solid var(--rule);
}
.nav-dropdown-link:last-child { border-bottom: none; }
.nav-dropdown-link:hover { color: var(--ink); background: var(--bg); }
.nav-dropdown-link.active {
  color: var(--accent);
  background: rgba(0,71,255,0.05);
}

/* Mobile hamburger */
.nav-toggle {
  display: none;
  background: none; border: none;
  font-size: 22px; color: var(--ink);
  cursor: pointer; padding: 4px 8px;
}

@media (max-width: 768px) {
  nav { padding: 0 24px; }
  .nav-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 56px; left: 0; right: 0;
    flex-direction: column;
    background: var(--white);
    border-bottom: 1px solid var(--rule);
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
  }
  .nav-links.open { display: flex; }
  .nav-link {
    padding: 0 24px; height: 48px;
    border-bottom: 1px solid var(--rule);
  }

  /* Mobile dropdowns: inline expansion */
  .nav-dropdown { width: 100%; }
  .nav-dropdown-toggle {
    width: 100%; justify-content: space-between;
  }
  .nav-dropdown-menu {
    position: static;
    box-shadow: none;
    border: none;
    border-bottom: 1px solid var(--rule);
    display: none;
  }
  .nav-dropdown:hover .nav-dropdown-menu { display: none; }
  .nav-dropdown.open .nav-dropdown-menu { display: block; }
  .nav-dropdown-link {
    padding: 12px 20px 12px 40px;
    border-bottom: 1px solid var(--rule);
  }
}