/* Mobile hamburger navigation */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  margin-left: auto;
  margin-right: 4px;
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 4px;
  cursor: pointer;
  flex-shrink: 0;
}
.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: white;
  border-radius: 1px;
  transition: transform 0.25s, opacity 0.25s;
}
nav.nav-open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
nav.nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
nav.nav-open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (min-width: 901px) {
  .nav-menu { display: block; }
}

@media (max-width: 900px) {
  .nav-toggle { display: flex; }
  .nav-menu {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    z-index: 99;
    background: rgba(45, 62, 80, 0.98);
    backdrop-filter: blur(12px);
    padding: 8px 0 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.2s, transform 0.2s, visibility 0.2s;
  }
  nav.nav-open .nav-menu {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }
  .nav-menu .nav-links {
    display: flex !important;
    flex-direction: column;
    gap: 0;
    padding: 0;
  }
  .nav-menu .nav-links a {
    display: block;
    padding: 14px 24px;
    font-size: 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }
  .nav-menu .nav-links a:hover { background: rgba(255, 255, 255, 0.06); }
  .nav-menu .nav-links li:last-child a { border-bottom: none; }
  body.nav-open { overflow: hidden; }
}