/* ============================================================
   NAV.CSS — Floating Navigation Bar
   KKN Digital Journal "JEJAK"
   ============================================================ */

/* ── NAVIGATION WRAPPER ───────────────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);

  /* Hidden by default — muncul setelah scroll 100vh */
  transform: translateY(-100%);
  opacity: 0;
  transition:
    transform var(--duration-slow) var(--ease-out),
    opacity   var(--duration-slow) var(--ease-out),
    background-color var(--duration-normal) var(--ease-out);

  /* Glassmorphism */
  background-color: rgba(245, 240, 232, 0.72);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  border-bottom: 1px solid rgba(214, 207, 189, 0.5);
}

/* State: visible */
.nav.is-visible {
  transform: translateY(0);
  opacity: 1;
}

/* State: hidden (saat scroll cepat ke bawah) */
.nav.is-hidden {
  transform: translateY(-100%);
  opacity: 0;
}

/* State: dark (saat berada di section gelap) */
.nav.is-dark {
  background-color: rgba(26, 22, 18, 0.80);
  border-bottom-color: rgba(255, 255, 255, 0.08);
}

/* ── NAV INNER ────────────────────────────────────────────── */
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--px-mobile);
  max-width: var(--max-width);
  margin: 0 auto;
}

@media (min-width: 768px) {
  .nav__inner {
    padding: var(--space-4) var(--px-tablet);
  }
}

@media (min-width: 1280px) {
  .nav__inner {
    padding: var(--space-4) var(--px-desktop);
  }
}

/* ── LOGO / WORDMARK ──────────────────────────────────────── */
.nav__logo {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: var(--tracking-tight);
  transition: color var(--duration-normal) var(--ease-out),
              opacity var(--duration-normal) var(--ease-out);
  text-decoration: none;
}

.nav__logo:hover {
  opacity: 0.7;
}

.nav.is-dark .nav__logo {
  color: var(--text-on-dark);
}

/* Logo dot — titik hijau kecil setelah nama */
.nav__logo::after {
  content: '.';
  color: var(--accent-sage);
}

/* ── NAV LINKS (desktop) ──────────────────────────────────── */
.nav__links {
  display: none;
  align-items: center;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .nav__links {
    display: flex;
  }
}

.nav__link {
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: var(--tracking-wide);
  text-transform: none;
  position: relative;
  padding-bottom: 2px;
  transition: color var(--duration-normal) var(--ease-out);
}

/* Underline tumbuh dari tengah */
.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  right: 50%;
  height: 1px;
  background-color: var(--accent-sage);
  transition:
    left  var(--duration-normal) var(--ease-out),
    right var(--duration-normal) var(--ease-out);
}

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

.nav__link:hover::after {
  left: 0;
  right: 0;
}

.nav.is-dark .nav__link {
  color: var(--text-on-dark-subtle);
}

.nav.is-dark .nav__link:hover {
  color: var(--text-on-dark);
}

/* Active link */
.nav__link.is-active {
  color: var(--accent-sage);
}

.nav__link.is-active::after {
  left: 0;
  right: 0;
  background-color: var(--accent-sage);
}

/* ── BACK TO TOP BUTTON ───────────────────────────────────── */
.nav__back-top {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-light);
  color: var(--text-secondary);
  transition:
    background-color var(--duration-normal) var(--ease-out),
    border-color     var(--duration-normal) var(--ease-out),
    color            var(--duration-normal) var(--ease-out),
    transform        var(--duration-normal) var(--ease-out);
}

.nav__back-top:hover {
  background-color: var(--accent-sage);
  border-color: var(--accent-sage);
  color: white;
  transform: translateY(-2px);
}

.nav.is-dark .nav__back-top {
  border-color: rgba(255, 255, 255, 0.15);
  color: var(--text-on-dark-subtle);
}

.nav.is-dark .nav__back-top:hover {
  background-color: var(--accent-sage);
  border-color: var(--accent-sage);
  color: white;
}

/* ── HAMBURGER (mobile) ───────────────────────────────────── */
.nav__hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  cursor: pointer;
}

@media (min-width: 768px) {
  .nav__hamburger {
    display: none;
  }
}

.nav__hamburger-line {
  width: 22px;
  height: 1.5px;
  background-color: var(--text-primary);
  border-radius: 2px;
  transition:
    transform var(--duration-normal) var(--ease-out),
    opacity   var(--duration-normal) var(--ease-out);
}

.nav.is-dark .nav__hamburger-line {
  background-color: var(--text-on-dark);
}

/* Hamburger open state */
.nav__hamburger.is-open .nav__hamburger-line:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav__hamburger.is-open .nav__hamburger-line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav__hamburger.is-open .nav__hamburger-line:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ── MOBILE MENU DRAWER ───────────────────────────────────── */
.nav__mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg-primary);
  z-index: calc(var(--z-nav) - 1);

  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);

  /* Hidden by default */
  opacity: 0;
  pointer-events: none;
  transform: translateY(-20px);
  transition:
    opacity   var(--duration-slow) var(--ease-out),
    transform var(--duration-slow) var(--ease-out);
}

.nav__mobile-menu.is-open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.nav__mobile-link {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: 400;
  color: var(--text-primary);
  transition: color var(--duration-normal) var(--ease-out);
}

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

/* ── BOTTOM NAV BAR (mobile only) ────────────────────────── */
.bottom-nav {
  position: fixed;
  bottom: var(--space-4);
  left: 50%;
  transform: translateX(-50%) translateY(120%);
  z-index: var(--z-nav);

  display: flex;
  align-items: center;
  gap: var(--space-2);

  background-color: rgba(26, 22, 18, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-4);
  border: 1px solid rgba(255, 255, 255, 0.08);

  transition: transform var(--duration-slow) var(--ease-out);
}

.bottom-nav.is-visible {
  transform: translateX(-50%) translateY(0);
}

/* Hide on desktop */
@media (min-width: 768px) {
  .bottom-nav {
    display: none;
  }
}

.bottom-nav__btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-full);
  color: rgba(245, 240, 232, 0.5);
  transition:
    color            var(--duration-normal) var(--ease-out),
    background-color var(--duration-normal) var(--ease-out);
  min-width: 48px;
}

.bottom-nav__btn:hover,
.bottom-nav__btn.is-active {
  color: var(--text-on-dark);
  background-color: rgba(107, 143, 113, 0.25);
}

.bottom-nav__btn.is-active .bottom-nav__dot {
  opacity: 1;
}

.bottom-nav__dot {
  width: 4px;
  height: 4px;
  border-radius: var(--radius-full);
  background-color: var(--accent-sage-light);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.bottom-nav__label {
  font-family: var(--font-ui);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
}