/* Header Styles */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 2px solid var(--color-gray-200);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  transition: all var(--transition-base);
  height: 5rem;
}

@media (max-width: 768px) {
  .header {
    height: 4rem;
  }
}

@media (max-width: 480px) {
  .header {
    height: 3.5rem;
  }
}

[data-theme="dark"] .header {
  background-color: rgba(18, 20, 22, 0.95);
  border-bottom: 2px solid var(--color-gray-700);
  box-shadow: 0 2px 8px rgba(255, 255, 255, 0.1);
}

.header.scrolled {
  background-color: rgba(255, 255, 255, 0.98);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  border-bottom-color: var(--color-gray-300);
}

[data-theme="dark"] .header.scrolled {
  background-color: rgba(18, 20, 22, 0.98);
  box-shadow: 0 4px 12px rgba(255, 255, 255, 0.15);
  border-bottom-color: var(--color-gray-600);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) 0;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding-left: var(--space-md);
  padding-right: var(--space-md);
}

@media (max-width: 768px) {
  .nav {
    padding: var(--space-sm) var(--space-md);
  }
}

@media (max-width: 480px) {
  .nav {
    padding: var(--space-xs) var(--space-sm);
  }
}

@media (min-width: 1024px) {
  .nav {
    padding-left: var(--space-lg);
    padding-right: var(--space-lg);
  }
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.logo:hover {
  text-decoration: none;
}

.logo img {
  height: 2.5rem;
  width: auto;
  transition: transform var(--transition-fast);
}

[data-theme="dark"] .logo img {
  filter: brightness(0) saturate(100%) invert(100%);
}

.logo:hover img {
  transform: scale(1.05);
}

.logo:focus {
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
  border-radius: var(--border-radius-sm);
}

[data-theme="dark"] .logo:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.logo:active {
  transform: scale(0.98);
}

.logo:active img {
  transform: scale(1.02);
}

/* Navigation Links */
.nav-links {
  display: none;
  align-items: center;
  gap: var(--space-lg);
}

@media (min-width: 769px) {
  .nav-links {
    display: flex;
  }
}

.nav-link {
  position: relative;
  color: var(--color-text-primary);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  padding: var(--space-sm) 0;
  transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link:focus {
  color: var(--nav-hover-color);
  text-decoration: none;
}

.nav-link:focus {
  outline: 2px solid var(--nav-hover-color);
  outline-offset: 2px;
  border-radius: var(--border-radius-sm);
}

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

/* Downloads link button styling */
.nav-link[href*="downloads"] {
  background: linear-gradient(135deg, var(--color-secondary), var(--color-secondary-dark));
  color: var(--color-white) !important;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--border-radius-md);
  font-weight: var(--font-weight-semibold);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.nav-link[href*="downloads"]:hover,
.nav-link[href*="downloads"]:focus {
  color: var(--color-white) !important;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  background: linear-gradient(135deg, var(--color-secondary-dark), var(--color-secondary));
}

[data-theme="dark"] .nav-link[href*="downloads"] {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  box-shadow: var(--shadow-md);
}

[data-theme="dark"] .nav-link[href*="downloads"]:hover,
[data-theme="dark"] .nav-link[href*="downloads"]:focus {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  box-shadow: var(--shadow-lg);
}

.nav-link[href*="downloads"]::after {
  display: none; /* Remove underline effect for downloads button */
}

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

/* Animated underline effect */
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--nav-hover-color);
  transition: width var(--transition-base);
}

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

/* Theme Toggle Button */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  background-color: transparent;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  margin-left: var(--space-md);
}

.theme-toggle:hover {
  background-color: var(--color-gray-100);
  border-color: var(--color-gray-400);
}

[data-theme="dark"] .theme-toggle {
  border-color: var(--color-gray-600);
}

[data-theme="dark"] .theme-toggle:hover {
  background-color: var(--color-gray-800);
  border-color: var(--color-gray-500);
}

.theme-toggle img {
  width: 1.25rem;
  height: 1.25rem;
  filter: brightness(0) saturate(100%) invert(27%) sepia(8%) saturate(1186%) hue-rotate(176deg) brightness(95%) contrast(91%);
  transition: filter var(--transition-fast);
}

[data-theme="dark"] .theme-toggle img {
  filter: brightness(0) saturate(100%) invert(100%) sepia(0%) saturate(7500%) hue-rotate(308deg) brightness(103%) contrast(103%);
}

/* Mobile Menu Toggle Button */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 10000;
  position: relative;
}

.mobile-menu-toggle span {
  display: block;
  width: 1.5rem;
  height: 2px;
  background-color: var(--color-text-primary);
  margin: 3px 0;
  transition: all 0.3s ease;
  transform-origin: center;
}

/* Hamburger animation when active */
.mobile-menu-toggle.mobile-menu-active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.mobile-menu-active span:nth-child(2) {
  opacity: 0;
  transform: scale(0);
}

.mobile-menu-toggle.mobile-menu-active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

/* Blue color for X when active in light mode */
.mobile-menu-toggle.mobile-menu-active span {
  background-color: #007BFF;
}

/* Keep original color in dark mode */
[data-theme="dark"] .mobile-menu-toggle.mobile-menu-active span {
  background-color: var(--color-text-primary);
}

/* Desktop navigation visibility */
@media (min-width: 769px) {
  .nav-links {
    display: flex !important;
  }
  
  .mobile-menu-toggle {
    display: none !important;
  }
  
  .mobile-nav {
    display: none !important;
  }
}

/* Downloads button styling in mobile menu */
.mobile-nav .nav-link[href*="downloads"] {
  background: linear-gradient(135deg, var(--color-secondary), var(--color-secondary-dark));
  color: var(--color-white) !important;
  padding: var(--space-lg) var(--space-2xl);
  border-radius: var(--border-radius-lg);
  font-weight: var(--font-weight-bold);
  box-shadow: var(--shadow-lg);
  margin: var(--space-md) 0;
}

.mobile-nav .nav-link[href*="downloads"]:hover,
.mobile-nav .nav-link[href*="downloads"]:focus {
  color: var(--color-white) !important;
  transform: scale(1.05);
  box-shadow: var(--shadow-xl);
  background: linear-gradient(135deg, var(--color-secondary-dark), var(--color-secondary));
}

[data-theme="dark"] .mobile-nav .nav-link[href*="downloads"] {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
}

[data-theme="dark"] .mobile-nav .nav-link[href*="downloads"]:hover,
[data-theme="dark"] .mobile-nav .nav-link[href*="downloads"]:focus {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
}

/* CTA Button */
.cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md) var(--space-xl);
  background: linear-gradient(135deg, var(--color-secondary), var(--color-secondary-dark));
  color: var(--color-white);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  border: none;
  cursor: pointer;
  font-size: var(--font-size-base);
  line-height: 1;
}

.cta-button:hover,
.cta-button:focus {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  text-decoration: none;
  color: var(--color-white);
  background: linear-gradient(135deg, var(--color-secondary-dark), var(--color-secondary));
}

.cta-button:active {
  transform: translateY(0);
}

.cta-button.secondary {
  background: linear-gradient(135deg, var(--color-secondary), var(--color-secondary-dark));
}

.cta-button.outline {
  background: transparent;
  color: var(--color-secondary);
  border: 2px solid var(--color-secondary);
  box-shadow: none;
}

.cta-button.outline:hover,
.cta-button.outline:focus {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

/* Dark mode CTA button - red gradient */
[data-theme="dark"] .cta-button {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
}

[data-theme="dark"] .cta-button:hover,
[data-theme="dark"] .cta-button:focus {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
}

[data-theme="dark"] .cta-button.outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

[data-theme="dark"] .cta-button.outline:hover,
[data-theme="dark"] .cta-button.outline:focus {
  background-color: var(--color-primary);
  color: var(--color-white);
}

/* Skip to main content link for accessibility */
.skip-to-main {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--color-primary);
  color: var(--color-white);
  padding: var(--space-sm) var(--space-md);
  text-decoration: none;
  border-radius: var(--border-radius-md);
  z-index: 1001;
  transition: top var(--transition-fast);
}

.skip-to-main:focus {
  top: 6px;
}

/* Body padding to account for fixed header */
body {
  padding-top: 4rem;
}

/* Mobile Navigation - Complete Rewrite */
@media (max-width: 768px) {
  body {
    padding-top: 3.5rem;
  }
  
  .header {
    height: 3.5rem;
  }
  
  /* Hide desktop navigation on mobile */
  .nav-links {
    display: none !important;
  }
  
  /* Show mobile hamburger menu */
  .mobile-menu-toggle {
    display: flex !important;
  }
  
  /* Mobile navigation overlay */
  .mobile-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    transform: translateX(-100%);
    transition: transform 0.3s ease-in-out;
    opacity: 0;
    visibility: hidden;
  }
  
  [data-theme="dark"] .mobile-nav {
    background: rgba(0, 0, 0, 0.98);
  }
  
  .mobile-nav.mobile-nav-open {
    transform: translateX(0);
    opacity: 1;
    visibility: visible;
  }
  
  .mobile-nav .nav-link {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text-primary);
    text-decoration: none;
    padding: 1rem 2rem;
    border-radius: 0.5rem;
    transition: none;
  }
  
  .mobile-nav .nav-link:hover {
    background: none;
    color: var(--color-text-primary);
  }
  
  /* Mobile theme toggle styling */
  .mobile-nav .mobile-theme-toggle {
    margin-top: 2rem;
    padding: 1rem;
    background: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    border-radius: 0.75rem;
    transition: none;
  }
  
  .mobile-nav .mobile-theme-toggle:hover,
  .mobile-nav .mobile-theme-toggle:focus,
  .mobile-nav .mobile-theme-toggle:active {
    background: var(--color-bg-secondary);
    border-color: var(--color-border);
    outline: none;
    transform: none;
  }
  
  .mobile-nav .mobile-theme-toggle img {
    width: 20px;
    height: 20px;
    max-width: none;
  }
}

@media (max-width: 480px) {
  body {
    padding-top: 3rem;
  }
  
  .header {
    height: 3rem;
  }
}

/* Ensure header content doesn't get cut off on very small screens */
@media (max-width: 320px) {
  .nav {
    padding-left: var(--space-sm);
    padding-right: var(--space-sm);
  }
  
  .logo img {
    height: 2rem;
  }
  
  .mobile-menu-toggle {
    width: 2rem;
    height: 2rem;
  }
  
  .mobile-menu-toggle span {
    width: 1.25rem;
  }
}