/* ── FILE: css/navigation.css ─────────────────────────── */
#main-nav {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: var(--z-nav);
  transition: all var(--transition);
  padding: 1.5rem 0;
}

#main-nav.scrolled {
  padding: 1rem 0;
  background: rgba(10,26,14,0.8);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
}

.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.logo-icon {
  width: 32px;
  height: 32px;
}
.logo-icon path {
  stroke: var(--biolum);
  stroke-dasharray: 300;
  stroke-dashoffset: 300;
  animation: leaf-draw 1.4s ease forwards;
}
.logo-text {
  font-family: var(--font-head);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: 2rem;
}
.nav-links a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color var(--transition);
  position: relative;
}
.nav-links a:hover {
  color: var(--text-primary);
}
.nav-links a.active {
  color: var(--biolum);
}
.nav-links a.active::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--biolum);
  box-shadow: 0 0 10px var(--biolum);
  border-radius: 2px;
}

.hamburger {
  display: none;
  width: 30px;
  height: 20px;
  position: relative;
  z-index: calc(var(--z-nav) + 1);
}
.hamburger span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition);
}
.hamburger span:nth-child(1) { top: 0; }
.hamburger span:nth-child(2) { top: 9px; }
.hamburger span:nth-child(3) { top: 18px; }

.nav-open .hamburger span:nth-child(1) {
  transform: rotate(45deg);
  top: 9px;
}
.nav-open .hamburger span:nth-child(2) {
  opacity: 0;
}
.nav-open .hamburger span:nth-child(3) {
  transform: rotate(-45deg);
  top: 9px;
}

@media (max-width: 768px) {
  .hamburger {
    display: block;
  }
  .nav-links {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: var(--void);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    transform: translateY(-100%);
    transition: transform var(--transition);
    visibility: hidden;
  }
  .nav-open .nav-links {
    transform: translateY(0);
    visibility: visible;
  }
  .nav-links a {
    font-size: 1.5rem;
  }
}