.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-dark);
  transition: background 0.3s ease;
}

[data-theme="light"] .header {
  background: rgba(248, 250, 252, 0.95);
  border-bottom: 1px solid var(--border-color);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-sm) 0;
}

.navbar-brand {
  cursor: pointer;
  display: flex;
  align-items: center;
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
}

.logo-image {
  height: 2.5rem;
  width: auto;
  margin-right: 0.75rem;
  vertical-align: middle;
}

.brand-slogan {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-left: 0.75rem;
  padding-left: 0.75rem;
  border-left: 1px solid var(--border-color);
  vertical-align: middle;
}

.navbar-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
}

.nav-link {
  position: relative;
  color: rgba(255, 255, 255, 0.8);
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  transition: color var(--transition-fast);
}

[data-theme="light"] .nav-link {
  color: var(--text-primary);
}

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

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background-color: var(--primary-color);
  border-radius: 2px;
}

.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--spacing-sm);
  background: transparent;
}

.navbar-toggle span {
  width: 24px;
  height: 2px;
  background-color: rgba(255, 255, 255, 0.8);
  border-radius: 2px;
  transition: all var(--transition-fast);
}

[data-theme="light"] .navbar-toggle span {
  background-color: var(--text-primary);
}

.mobile-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--bg-dark);
  box-shadow: var(--shadow-md);
  border-top: 1px solid var(--border-dark);
}

[data-theme="light"] .mobile-menu {
  background: white;
  border-top: 1px solid var(--border-color);
}

.mobile-menu ul {
  list-style: none;
  padding: var(--spacing-sm);
}

.mobile-menu li {
  margin: var(--spacing-xs) 0;
}

.mobile-nav-link {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: rgba(255, 255, 255, 0.8);
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

[data-theme="light"] .mobile-nav-link {
  color: var(--text-primary);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--primary-color);
}

.mobile-menu-open .mobile-menu {
  display: block;
}

@media (max-width: 1024px) {
  .navbar-menu {
    gap: var(--spacing-md);
  }
  
  .nav-link {
    font-size: 0.875rem;
    padding: var(--spacing-xs);
  }
  
  .brand-slogan {
    display: none;
  }
}

@media (max-width: 768px) {
  .navbar-menu {
    display: none;
  }
  
  .navbar-toggle {
    display: flex;
  }
  
  .header-right {
    gap: var(--spacing-sm);
  }
  
  .language-trigger {
    padding: var(--spacing-xs);
    font-size: 0.8rem;
  }
  
  .theme-toggle {
    width: 36px;
    height: 36px;
  }
  
  .logo {
    font-size: 1.25rem;
  }
  
  .logo-image {
    height: 2rem;
  }
}

@media (max-width: 480px) {
  .navbar {
    padding: var(--spacing-xs) 0;
  }
  
  .header-right {
    gap: var(--spacing-xs);
  }
  
  .language-trigger {
    padding: 4px 8px;
    font-size: 0.75rem;
  }
  
  .language-trigger .chevron {
    width: 12px;
    height: 12px;
  }
  
  .theme-toggle {
    width: 32px;
    height: 32px;
  }
  
  .theme-icon {
    width: 16px;
    height: 16px;
  }
  
  .logo {
    font-size: 1.1rem;
  }
  
  .logo-image {
    height: 1.75rem;
  }
}

.language-switcher {
  position: relative;
}

.language-trigger {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.8);
  transition: all var(--transition-fast);
}

[data-theme="light"] .language-trigger {
  color: var(--text-primary);
}

.language-trigger:hover {
  box-shadow: var(--shadow-md);
}

.chevron {
  width: 14px;
  height: 14px;
  transition: transform var(--transition-fast);
}

.lang-dropdown-open .chevron {
  transform: rotate(180deg);
}

.language-dropdown {
  position: absolute;
  top: calc(100% + var(--spacing-xs));
  right: 0;
  min-width: 120px;
  background: white;
  box-shadow: var(--shadow-lg);
  border-radius: var(--radius-md);
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-fast);
}

.lang-dropdown-open .language-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.language-dropdown button {
  display: block;
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
  background: transparent;
  color: var(--text-primary);
  font-size: 0.875rem;
  transition: background-color var(--transition-fast);
}

.language-dropdown button:hover {
  background-color: var(--bg-dark);
}

.theme-toggle-wrapper {
  position: relative;
}

.theme-toggle {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-dark);
  cursor: pointer;
  transition: all var(--transition-fast);
  color: rgba(255, 255, 255, 0.8);
}

[data-theme="light"] .theme-toggle {
  background: rgba(0, 0, 0, 0.05);
  border-color: var(--border-color);
  color: var(--text-primary);
}

.theme-toggle:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: scale(1.05);
}

[data-theme="light"] .theme-toggle:hover {
  background: rgba(0, 0, 0, 0.1);
}

.theme-icon {
  width: 18px;
  height: 18px;
  transition: opacity var(--transition-fast);
}

.sun-icon {
  display: none;
}

.moon-icon {
  display: block;
}

[data-theme="light"] .sun-icon {
  display: block;
}

[data-theme="light"] .moon-icon {
  display: none;
}

.footer {
  position: relative;
  background: linear-gradient(180deg, var(--bg-dark) 0%, var(--bg-dark-secondary) 100%);
  padding: var(--spacing-4xl) 0 var(--spacing-xl);
  overflow: hidden;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-glow {
  position: absolute;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.15;
  pointer-events: none;
}

.footer-glow-1 {
  top: -150px;
  right: -100px;
  background: var(--primary-color);
  animation: footerGlow 10s ease-in-out infinite;
}

.footer-glow-2 {
  bottom: -150px;
  left: -100px;
  background: var(--secondary-color);
  animation: footerGlow 10s ease-in-out infinite reverse;
}

@keyframes footerGlow {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-30px) scale(1.1); }
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr 1.2fr 1fr;
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
  margin-top: var(--spacing-xl);
  position: relative;
  z-index: 1;
}

.footer-brand-section {
  padding-right: var(--spacing-xl);
  border-right: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.footer-logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: 12px;
  color: white;
  padding: 8px;
  box-sizing: border-box;
}

.footer-logo {
  font-size: 1.75rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-tagline {
  font-size: 1.1rem;
  color: var(--primary-color);
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
  line-height: 1.1;
}

.footer-description {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
}

.footer-social {
  display: flex;
  gap: var(--spacing-lg);
}

.social-link {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 50%;
  color: var(--text-secondary);
  transition: all var(--transition-normal);
}

.social-link:hover {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  transform: translateY(-3px);
}

.social-link svg {
  width: 18px;
  height: 18px;
}

.footer-links-section {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-xl);
}

.footer-links-group {
  padding: 0 var(--spacing-md);
}

.footer-links {
  list-style: none;
  padding-left: 0;
}

.footer-links li {
  margin-bottom: var(--spacing-sm);
  line-height: 1.2;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.footer-links a::before {
  content: '';
  width: 4px;
  height: 4px;
  background: var(--primary-color);
  border-radius: 50%;
  opacity: 0;
  transform: translateX(-8px);
  transition: all var(--transition-fast);
}

.footer-links a:hover {
  color: var(--primary-color);
  padding-left: var(--spacing-sm);
}

.footer-links a:hover::before {
  opacity: 1;
  transform: translateX(0);
}

.footer-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: white;
  margin-bottom: var(--spacing-lg);
  position: relative;
  padding-bottom: var(--spacing-sm);
}

.footer-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: linear-gradient(90deg, var(--primary-color), transparent);
}

[data-theme="light"] .footer-title {
  color: var(--text-primary);
}

.footer-contact-section {
  padding-left: var(--spacing-xl);
  border-left: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.3;
  padding: var(--spacing-xs);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.footer-contact-item:hover {
  background: rgba(255, 255, 255, 0.03);
}

.footer-contact-item svg {
  width: 22px;
  height: 22px;
  color: var(--primary-color);
  flex-shrink: 0;
  margin-top: 2px;
}

.footer-contact-item span {
  line-height: 1.5;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: var(--spacing-xl);
  position: relative;
  z-index: 1;
}

.footer-bottom-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.footer-copyright {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-legal {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.legal-link {
  color: var(--text-muted);
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

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

.separator {
  color: rgba(255, 255, 255, 0.2);
}

/* === Tablet (768px - 1024px) === */
@media (max-width: 1024px) {
  .navbar-menu {
    gap: var(--spacing-md);
  }
  
  .nav-link {
    font-size: 0.95rem;
  }
  
  .logo {
    font-size: 1.4rem;
  }
  
  .footer-top {
    grid-template-columns: 1fr 1.5fr;
  }
  
  .footer-contact-section {
    border-left: none;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-left: 0;
    padding-top: var(--spacing-xl);
    grid-column: span 2;
  }
  
  .footer-brand-section {
    border-right: none;
    padding-right: 0;
  }
}

/* === Mobile (max-width: 768px) === */
@media (max-width: 768px) {
  .navbar {
    padding: var(--spacing-xs) 0;
  }
  
  .logo {
    font-size: 1.3rem;
  }
  
  .brand-slogan {
    display: none;
  }
  
  .header-right {
    gap: var(--spacing-sm);
  }
  
  .footer-top {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
  
  .footer-brand-section,
  .footer-contact-section {
    border: none;
    padding: 0;
    text-align: center;
  }
  
  .footer-links-section {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer-links-group {
    padding: 0;
  }
  
  .footer-brand {
    justify-content: center;
  }
  
  .footer-contact-item {
    justify-content: center;
  }
  
  .footer-bottom-content {
    flex-direction: column;
    text-align: center;
  }
}

/* === Small Mobile (max-width: 480px) === */
@media (max-width: 480px) {
  .logo {
    font-size: 1.2rem;
  }
  
  .language-switcher {
    display: none;
  }
}