.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  border-bottom: 1px solid transparent;
  transition: background var(--transition), border-color var(--transition),
    backdrop-filter var(--transition), transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);

  --nav-color-primary: #151F28;
  --nav-color-secondary: #334155;
  --nav-color-border: rgba(21, 31, 40, 0.3);
}

@media (max-width: 768px) {
  .navbar.nav-hidden {
    transform: translateY(-100%);
  }
}

.navbar.scrolled {
  background: var(--navbar-scrolled-bg);
  backdrop-filter: blur(16px);

  --nav-color-primary: var(--text-primary);
  --nav-color-secondary: var(--text-secondary);
  --nav-color-border: var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ── LOGO ── */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 110;
}

.logo-wrapper {
  position: relative;
  width: 28px;
  height: 28px;
}

.nav-logo-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  position: absolute;
  top: 0;
  left: 0;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.logo-unscrolled {
  mix-blend-mode: multiply;
}

.logo-scrolled {
  opacity: 0;
  transform: scale(0.8);
}

.navbar.scrolled .logo-unscrolled {
  opacity: 0;
  transform: scale(0.8);
}

.navbar.scrolled .logo-scrolled {
  opacity: 1;
  transform: scale(1);
}

.logo-text {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--nav-color-primary);
  transition: color var(--transition);
}

/* ── DESKTOP NAV LINKS ── */
.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-size: 0.875rem;
  color: var(--nav-color-secondary);
  transition: color var(--transition);
  position: relative;
  font-weight: 500;
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 1px;
  transition: width var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--nav-color-primary);
}

.nav-link.active {
  font-weight: 700;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* ── THEME ICON BUTTON ── */
.theme-icon-btn {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--nav-color-border);
  border-radius: 50%;
  cursor: pointer;
  color: var(--nav-color-secondary);
  transition: color var(--transition), border-color var(--transition),
    background var(--transition), transform 0.4s ease;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.theme-icon-btn:hover {
  color: var(--nav-color-primary);
  border-color: var(--nav-color-primary);
  transform: rotate(20deg);
}

.theme-icon-btn.light {
  color: #f59e0b;
  border-color: #f59e0b;
}

.theme-icon-btn.light:hover {
  transform: rotate(30deg) scale(1.1);
}

/* ── LANGUAGE DROPDOWN ── */
.nav-lang-wrap {
  position: relative;
}

.nav-lang-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: 1px solid var(--nav-color-border);
  border-radius: 20px;
  padding: 5px 12px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--nav-color-secondary);
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-sans);
}

.nav-lang-btn:hover {
  color: var(--nav-color-primary);
  border-color: var(--nav-color-primary);
}

.lang-arrow {
  font-size: 0.65rem;
  margin-left: 2px;
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  min-width: 80px;
  box-shadow: var(--shadow);
  z-index: 200;
  animation: dropFade 0.15s ease;
}

@keyframes dropFade {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.lang-option {
  display: block;
  width: 100%;
  padding: 8px 16px;
  text-align: left;
  background: none;
  border: none;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  font-family: var(--font-sans);
  transition: background var(--transition);
}

.lang-option:hover {
  background: var(--hover-highlight);
  color: var(--text-primary);
}

.lang-option.active {
  color: var(--text-primary);
  font-weight: 700;
}

/* ── HAMBURGER BUTTON ── */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 110;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  position: relative;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--nav-color-primary);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease, width 0.3s ease;
  transform-origin: center;
  pointer-events: none; /* spans must not intercept clicks */
}

.hamburger.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger.open span:nth-child(2) {
  opacity: 0;
  width: 0;
}
.hamburger.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── MOBILE OVERLAY ── */
.mobile-menu-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 150;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.mobile-menu-overlay.visible {
  opacity: 1;
}

/* ── MOBILE DRAWER ── */
.mobile-drawer {
  position: fixed;
  top: 0;
  right: 0;
  width: min(320px, 85vw);
  height: 100dvh;
  background: var(--bg);
  border-left: 1px solid var(--border);
  z-index: 160;
  display: flex;
  flex-direction: column;
  padding: 0;
  transform: translateX(100%);
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.35s ease;
  box-shadow: none; /* Hidden until open */
  overflow: hidden;
}

.mobile-drawer.open {
  transform: translateX(0);
  box-shadow: -20px 0 60px rgba(0, 0, 0, 0.4);
}

.mobile-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
}

.mobile-drawer-logo {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.mobile-drawer-close {
  background: none;
  border: none;
  font-size: 1.1rem;
  color: var(--text-secondary);
  cursor: pointer;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  transition: background var(--transition);
}

.mobile-drawer-close:hover {
  background: var(--hover-highlight);
  color: var(--text-primary);
}

.mobile-drawer-nav {
  display: flex;
  flex-direction: column;
  padding: 16px 12px;
  gap: 4px;
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
  background: var(--hover-highlight);
  color: var(--text-primary);
}

.mobile-nav-link.active {
  font-weight: 700;
}

.mobile-nav-icon {
  font-size: 1rem;
  width: 20px;
  text-align: center;
  opacity: 0.6;
}

.mobile-drawer-controls {
  margin-top: auto;
  padding: 16px 16px 32px;
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--border);
}

.mobile-control-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 8px;
  border-bottom: 1px solid var(--border);
}

.mobile-control-row:last-child {
  border-bottom: none;
}

.mobile-control-label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-primary);
}

.mobile-lang-options {
  display: flex;
  gap: 6px;
}

.mobile-lang-chip {
  padding: 5px 12px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: none;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  font-family: var(--font-sans);
  transition: all var(--transition);
}

.mobile-lang-chip:hover {
  border-color: var(--text-secondary);
  color: var(--text-primary);
}

.mobile-lang-chip.active {
  background: var(--text-primary);
  color: var(--bg);
  border-color: var(--text-primary);
}

/* ── RESPONSIVE: Show hamburger on mobile ── */
@media (max-width: 768px) {
  .desktop-nav {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .mobile-menu-overlay {
    display: block;
    pointer-events: none; /* Don't block taps when hidden */
  }

  .mobile-menu-overlay.visible {
    pointer-events: all; /* Re-enable when open */
  }

  .navbar {
    --nav-color-primary: var(--text-primary);
    --nav-color-secondary: var(--text-secondary);
  }

  .navbar:not(.scrolled) {
    background: transparent;
    --nav-color-primary: #151F28;
  }

  .logo-text {
    font-size: 1rem;
  }
}

@media (max-width: 400px) {
  .nav-inner {
    padding: 0 16px;
  }
}