/* ════════════════════════════════════════════════
   NAV — Navbar · Hamburger · Theme Toggle
   ════════════════════════════════════════════════ */

nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  max-width: 100vw;
  z-index: 9999;
  padding: 1.1rem 5vw;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: var(--nav-bg);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--border);
  transition: background 0.4s;
  /* Removed overflow:hidden — it was hiding the hamburger menu */
}

.nav-logo {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -.02em;
  color: var(--text);
}

.nav-logo span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 2rem;
  margin-left: auto;
}

.nav-links a {
  color: var(--muted);
  font-size: .82rem;
  letter-spacing: .05em;
  text-transform: uppercase;
  font-weight: 500;
  transition: color var(--transition);
  padding: 0.25rem 0;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transition: transform 0.25s;
}

.nav-links a:hover {
  color: var(--accent);
}

.nav-links a:hover::after {
  transform: scaleX(1);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  margin-left: auto;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

.hamburger.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.open span:nth-child(2) {
  opacity: 0;
}

.hamburger.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Theme toggle */
.theme-toggle {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--bg3);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text);
  transition: background var(--transition), border-color var(--transition), transform 0.2s;
  flex-shrink: 0;
}

.theme-toggle:hover {
  border-color: var(--accent);
  transform: scale(1.08);
}

.icon-moon {
  display: none;
}

[data-theme="light"] .icon-sun {
  display: none;
}

[data-theme="light"] .icon-moon {
  display: block;
}

/* ── MOBILE NAV ── */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-links {
    display: none;
    position: fixed;
    top: 64px;
    /* height of navbar */
    left: 0;
    right: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(18px) saturate(160%);
    -webkit-backdrop-filter: blur(18px) saturate(160%);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: center;
    gap: 0;
    padding: 1.5rem 0;
    margin-left: 0;
    z-index: 9998;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links li {
    width: 100%;
    text-align: center;
  }

  .nav-links a {
    display: block;
    padding: 1rem 2rem;
    font-size: 1rem;
  }
}