/* ── Hamburger Navigation ─────────────────────────── */
.hamburger-btn {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 1000;
  background: #1a1a3e;
  border: 2px solid #2a2a5e;
  border-radius: 10px;
  width: 44px;
  height: 44px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  transition: border-color 0.2s;
}
.hamburger-btn:hover { border-color: #4cff72; }
.hamburger-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}
.hamburger-btn.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger-btn.open span:nth-child(2) { opacity: 0; }
.hamburger-btn.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 15, 35, 0.95);
  z-index: 999;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
}
.nav-overlay.open { display: flex; }

.nav-overlay a {
  color: #ccc;
  text-decoration: none;
  font-size: 1.15rem;
  padding: 0.6rem 1.5rem;
  border-radius: 8px;
  transition: color 0.2s, background 0.2s;
  font-family: 'Segoe UI', sans-serif;
}
.nav-overlay a:hover {
  color: #4cff72;
  background: rgba(76, 255, 114, 0.08);
}