/* Header Navigation */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 1000;
  transition: background-color var(--transition-normal), box-shadow var(--transition-normal), height var(--transition-normal);
  display: flex;
  align-items: center;
}

.site-header.scrolled {
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 4px 30px rgba(15, 23, 42, 0.03);
  border-bottom: 1px solid rgba(241, 245, 249, 0.6);
  height: 70px;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo Design */
.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  font-weight: var(--weight-bold);
  font-size: var(--text-xl);
  color: var(--color-primary);
  user-select: none;
}

.logo-dot {
  width: 10px;
  height: 10px;
  background-color: var(--color-secondary);
  border-radius: var(--radius-full);
  display: inline-block;
  box-shadow: 0 0 10px var(--color-secondary);
}

/* Nav Links Menu */
.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-8);
  list-style: none;
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-muted);
  position: relative;
  padding: var(--spacing-2) 0;
}

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

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

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

/* Actions area: Language Switcher and CTA */
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-6);
}

/* Language Switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  background-color: var(--color-bg-light);
  border: 1px solid var(--color-border);
  padding: 3px;
  border-radius: var(--radius-full);
}

.lang-btn {
  background: none;
  border: none;
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--color-text-muted);
  padding: var(--spacing-1) var(--spacing-3);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.lang-btn.active {
  background-color: var(--color-primary);
  color: var(--color-bg-white);
}

/* Mobile Hamburger Menu button */
.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-2);
  z-index: 1001;
}

.hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-primary);
  margin: 5px 0;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

/* Mobile Nav Overlay */
.mobile-nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background-color: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  z-index: 999;
}

.mobile-nav-overlay.open {
  transform: translateX(0);
}

.mobile-nav-menu {
  list-style: none;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-6);
  margin-bottom: var(--spacing-12);
}

.mobile-nav-link {
  font-size: var(--text-2xl);
  font-weight: var(--weight-bold);
  color: var(--color-bg-white);
  display: block;
  padding: var(--spacing-2);
}

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

.mobile-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-6);
  width: 80%;
  max-width: 320px;
}

.mobile-actions .lang-switcher {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
}

.mobile-actions .lang-btn {
  color: var(--color-text-light);
}

.mobile-actions .lang-btn.active {
  background-color: var(--color-bg-white);
  color: var(--color-primary);
}

/* Responsive Rules for Header */
@media (max-width: 991px) {
  .nav-menu {
    display: none;
  }
  .nav-actions {
    display: none;
  }
  .hamburger {
    display: block;
  }
  
  /* Animate Hamburger lines to 'X' */
  .hamburger.open .hamburger-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .hamburger.open .hamburger-line:nth-child(2) {
    opacity: 0;
  }
  .hamburger.open .hamburger-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
}

.btn-nav {
  padding: 0.5rem 1.5rem !important;
  font-size: var(--text-sm) !important;
}