/* ============================================================
   ECOCLIM — Navigation
   ============================================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: background-color var(--duration-base) var(--ease-inout),
              border-color var(--duration-base) var(--ease-inout);
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background-color: rgba(15, 17, 14, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--border);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

/* --- Logo --- */
.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  transition: opacity var(--duration-fast);
}

.nav__logo:hover { opacity: 0.8; }

.nav__logo-mark {
  width: 32px;
  height: 32px;
  background-color: var(--accent-fill);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}

.nav__logo-img {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
}

/* --- Links --- */
.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav__link {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  position: relative;
  transition: color var(--duration-fast);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--accent);
  transition: width var(--duration-base) var(--ease-out-expo);
}

.nav__link:hover {
  color: var(--text-primary);
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

.nav__link.active {
  color: var(--text-primary);
}

/* --- CTA Button --- */
.nav__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px 20px;
  font-size: var(--text-sm);
  font-weight: 500;
  color: #fff;
  background-color: var(--accent-fill);
  border-radius: var(--radius-sm);
  position: relative;
  overflow: hidden;
  transition: color var(--duration-fast);
}

.nav__cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background-color: var(--accent-hover);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration-base) var(--ease-out-expo);
}

.nav__cta:hover::before { transform: scaleX(1); }

.nav__cta span { position: relative; z-index: 1; }

/* --- Mobile Hamburger --- */
.nav__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
  cursor: pointer;
}

.nav__burger-line {
  width: 24px;
  height: 1.5px;
  background-color: var(--text-primary);
  transition: transform var(--duration-base) var(--ease-out-expo),
              opacity var(--duration-fast);
}

/* --- Mobile Overlay --- */
.nav__mobile {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  background-color: var(--bg-base);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--container-pad);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-base) var(--ease-inout);
}

.nav__mobile.open {
  opacity: 1;
  pointer-events: all;
}

.nav__mobile-close {
  position: absolute;
  top: 24px;
  right: var(--container-pad);
  font-size: 1.5rem;
  color: var(--text-secondary);
  padding: var(--space-sm);
}

.nav__mobile-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.nav__mobile-link {
  font-family: var(--font-display);
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 600;
  color: var(--text-secondary);
  transition: color var(--duration-fast);
  opacity: 0;
  transform: translateY(20px);
}

.nav__mobile.open .nav__mobile-link {
  opacity: 1;
  transform: translateY(0);
}

.nav__mobile-link:hover { color: var(--accent); }

.nav__mobile-contact {
  margin-top: var(--space-2xl);
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .nav__links,
  .nav__cta { display: none; }

  .nav__burger { display: flex; }
}

/* --- Burger animation (open) --- */
.nav__burger.open .nav__burger-line:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}
.nav__burger.open .nav__burger-line:nth-child(2) {
  opacity: 0;
}
.nav__burger.open .nav__burger-line:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}