/* ============================================
   NAVIGATION — Tanjung Bayu
   ============================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  transition: background-color 0.4s var(--ease-smooth),
              backdrop-filter 0.4s var(--ease-smooth);
}

.nav.is-scrolled {
  background-color: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--sp-lg);
  height: 100%;
}

.nav__logo {
  font-family: var(--ff-display);
  font-size: 18px;
  font-weight: 500;
  color: var(--c-white);
  letter-spacing: 0.5px;
  white-space: nowrap;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--sp-xl);
}

.nav__link {
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--c-white-80);
  transition: color var(--t-fast) var(--ease-out);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--c-white);
  transition: width var(--t-fast) var(--ease-out);
}

.nav__link:hover {
  color: var(--c-white);
}

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

/* ---- Burger ---- */
.nav__burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 48px;
  height: 48px;
  gap: 6px;
}

.nav__burger span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--c-white);
  transition: transform var(--t-fast) var(--ease-out),
              opacity var(--t-fast) var(--ease-out);
}

.nav__burger.is-active span:first-child {
  transform: translateY(4px) rotate(45deg);
}

.nav__burger.is-active span:last-child {
  transform: translateY(-4px) rotate(-45deg);
}

/* ---- Mobile Overlay ---- */
.nav__overlay {
  position: fixed;
  inset: 0;
  z-index: 99;
  background-color: var(--c-deep-teal);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.5s var(--ease-out),
              visibility 0.5s var(--ease-out);
}

.nav__overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.nav__overlay-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-xl);
}

.nav__overlay-link {
  font-family: var(--ff-display);
  font-size: 32px;
  font-weight: 400;
  color: var(--c-white);
  opacity: 0.7;
  transition: opacity var(--t-fast) var(--ease-out);
}

.nav__overlay-link:hover {
  opacity: 1;
}

.nav__overlay-link--cta {
  margin-top: var(--sp-lg);
  font-family: var(--ff-body);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.5px;
  padding: 16px 32px;
  border: 1px solid rgba(255, 255, 255, 0.40);
  border-radius: var(--r-sm);
  opacity: 1;
}

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

  .nav__burger {
    display: flex;
  }
}