/**
 * Bugloos Header Component Styles
 * Implements scroll-based transparency, responsive navigation, and mobile menu
 */

/* ===== HEADER MAIN STYLES ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  transition: all var(--transition-normal);
  background-color: transparent;
  backdrop-filter: none;
}

/* Scrolled state */
.header--scrolled {
  background-color: var(--bugloos-white);
  box-shadow: var(--shadow-lg);
  border-bottom: 1px solid var(--bugloos-gray-100);
  backdrop-filter: blur(10px);
}

/* Header Container */
.header__container {
  max-width: var(--max-width-container);
  margin: 0 auto;
  padding: 0 var(--spacing-4);
}

@media (min-width: 640px) {
  .header__container {
    padding: 0 var(--spacing-6);
  }
}

@media (min-width: 1024px) {
  .header__container {
    padding: 0 var(--spacing-8);
  }
}

/* Header Content */
.header__content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: var(--spacing-16);
  position: relative;
}

/* ===== LOGO STYLES ===== */
.header__logo {
  flex-shrink: 0;
  z-index: var(--z-dropdown);
}

.header__logo-link {
  text-decoration: none;
  display: block;
  outline: none;
}

.header__logo-text {
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-bold);
  margin: 0;
  transition: color var(--transition-normal);
  color: var(--bugloos-white);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

/* Logo color when scrolled */
.header--scrolled .header__logo-text {
  color: var(--bugloos-dark);
  text-shadow: none;
}

/* ===== MOBILE MENU TOGGLE ===== */
.header__mobile-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: var(--z-tooltip);
  transition: all var(--transition-normal);
  border-radius: var(--radius-md);
}

.header__mobile-toggle:hover {
  background-color: rgba(0, 0, 0, 0.05);
}

.header--scrolled .header__mobile-toggle:hover {
  background-color: rgba(99, 195, 209, 0.1);
}

/* Hamburger Menu */
.header__hamburger {
  display: flex;
  flex-direction: column;
  width: 1.25rem;
  height: 1rem;
  position: relative;
}

.header__hamburger-line {
  display: block;
  width: 100%;
  height: 0.143rem;
  background-color: var(--bugloos-white);
  transition: all var(--transition-normal);
  transform-origin: center;
}

.header--scrolled .header__hamburger-line {
  background-color: var(--bugloos-dark);
}

/* Dark hamburger when mobile menu is open (for contrast against white background) */
.header__mobile-toggle[aria-expanded="true"] .header__hamburger-line {
  background-color: var(--bugloos-dark);
}

.header__hamburger-line:nth-child(1) {
  margin-bottom: 0.25rem;
}

.header__hamburger-line:nth-child(2) {
  margin-bottom: 0.25rem;
}

/* Animated hamburger when menu is open */
.header__mobile-toggle[aria-expanded="true"] .header__hamburger-line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.header__mobile-toggle[aria-expanded="true"] .header__hamburger-line:nth-child(2) {
  opacity: 0;
}

.header__mobile-toggle[aria-expanded="true"] .header__hamburger-line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

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

/* ===== NAVIGATION STYLES ===== */
/* Mobile Navigation (default - hidden with smooth transitions) */
.header__nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  z-index: var(--z-modal-backdrop);
  padding: var(--spacing-20) var(--spacing-6) var(--spacing-8);
  overflow-y: auto;
  margin: 0;
  /* Start hidden with smooth transitions */
  opacity: 0;
  visibility: hidden;
  transform: translateY(-100%);
  transition: all var(--transition-normal) ease-out;
}

/* Mobile full-screen menu when opened */
.header__nav--open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* Mobile Navigation List */
.header__nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-8);
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  text-align: center;
}

/* Mobile Navigation Items */
.header__nav-item {
  margin: 0;
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--transition-normal);
  transition-delay: 0s; /* No delay when closing */
}

.header__nav--open .header__nav-item {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered animation for mobile menu items when opening */
.header__nav--open .header__nav-item:nth-child(1) { transition-delay: 0.1s; }
.header__nav--open .header__nav-item:nth-child(2) { transition-delay: 0.2s; }
.header__nav--open .header__nav-item:nth-child(3) { transition-delay: 0.3s; }
.header__nav--open .header__nav-item:nth-child(4) { transition-delay: 0.4s; }
.header__nav--open .header__nav-item:nth-child(5) { transition-delay: 0.5s; }
.header__nav--open .header__nav-item:nth-child(6) { transition-delay: 0.6s; }

/* Mobile Navigation Links */
.header__nav-link {
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  font-size: var(--text-2xl);
  color: var(--bugloos-dark);
  transition: all var(--transition-normal);
  padding: var(--spacing-4) var(--spacing-8);
  border-radius: var(--radius-lg);
  min-width: 14.286rem;
  min-height: 3.429rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.header__nav-link:hover {
  color: var(--bugloos-primary);
  background-color: rgba(99, 195, 209, 0.1);
  transform: scale(1.05);
}

.header__nav-link--active {
  color: var(--bugloos-primary);
  background-color: rgba(99, 195, 209, 0.15);
}

/* ===== DESKTOP NAVIGATION ===== */
@media (min-width: 768px) {
  .header__nav {
    display: flex;
    position: static;
    background-color: transparent;
    backdrop-filter: none;
    padding: 0;
    overflow-y: visible;
    width: auto;
    height: auto;
    z-index: auto;
    margin: 0;
    opacity: 1;
    visibility: visible;
    transform: none;
    transition: none;
  }

  /* Ensure nav is always visible on desktop, even without --open class */
  .header__nav,
  .header__nav--open {
    display: flex;
  }

  .header__nav-list {
    flex-direction: row;
    gap: var(--spacing-8);
    align-items: center;
    justify-content: flex-start;
    min-height: auto;
    text-align: left;
  }

  .header__nav-item {
    margin: 0;
    opacity: 1;
    transform: none;
    transition: none;
  }

  /* Override mobile animations specifically on desktop */
  .header__nav-item:nth-child(1),
  .header__nav-item:nth-child(2),
  .header__nav-item:nth-child(3),
  .header__nav-item:nth-child(4),
  .header__nav-item:nth-child(5),
  .header__nav-item:nth-child(6) {
    opacity: 1;
    transform: none;
    transition: none;
    transition-delay: 0s;
  }

  .header__nav-link {
    display: block;
    font-size: var(--text-base);
    color: rgba(255, 255, 255, 0.9);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    background-color: transparent;
    border-radius: 0;
    min-width: auto;
    min-height: auto;
    padding: var(--spacing-2) 0;
    justify-content: flex-start;
  }

  .header__nav-link:hover {
    color: var(--bugloos-primary);
    background-color: transparent;
    transform: none;
  }

  .header__nav-link--active {
    color: var(--bugloos-primary);
    background-color: transparent;
  }

  /* Scrolled state navigation */
  .header--scrolled .header__nav-link {
    color: var(--bugloos-dark);
    text-shadow: none;
  }

  .header--scrolled .header__nav-link:hover {
    color: var(--bugloos-primary);
  }

  .header--scrolled .header__nav-link--active {
    color: var(--bugloos-primary);
  }

  /* Disable mobile-specific animations and delays on desktop */
  .header__nav--open .header__nav-item:nth-child(1),
  .header__nav--open .header__nav-item:nth-child(2),
  .header__nav--open .header__nav-item:nth-child(3),
  .header__nav--open .header__nav-item:nth-child(4),
  .header__nav--open .header__nav-item:nth-child(5),
  .header__nav--open .header__nav-item:nth-child(6) {
    transition-delay: 0s;
  }
}

/* ===== CTA BUTTON STYLES ===== */
.header__cta {
  display: none;
  z-index: var(--z-dropdown);
}

@media (min-width: 768px) {
  .header__cta {
    display: block;
  }
}

.header__cta-button {
  padding: var(--spacing-2) var(--spacing-6);
  border-radius: var(--radius-lg);
  font-weight: var(--font-weight-medium);
  transition: all var(--transition-normal);
  transform: translateZ(0);
  background-color: var(--bugloos-dark);
  color: var(--bugloos-white);
  border: 1px solid var(--bugloos-dark);
  font-size: var(--text-sm);
}

.header__cta-button:hover {
  background-color: var(--bugloos-primary);
  border-color: var(--bugloos-primary);
  transform: scale(1.05);
}

/* Transparent state CTA button */
.header:not(.header--scrolled) .header__cta-button {
  background-color: rgba(255, 255, 255, 0.2);
  color: var(--bugloos-white);
  border-color: rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(10px);
}

.header:not(.header--scrolled) .header__cta-button:hover {
  background-color: var(--bugloos-primary);
  border-color: var(--bugloos-primary);
}

/* ===== MOBILE MENU OVERLAY ===== */
.header__nav-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: var(--z-modal-backdrop);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.header__nav-overlay--visible {
  opacity: 1;
  visibility: visible;
}

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

/* ===== ACCESSIBILITY ENHANCEMENTS ===== */
/* Skip to main content link */
.header__skip-link {
  position: absolute;
  top: -40px;
  left: var(--spacing-4);
  background-color: var(--bugloos-primary);
  color: var(--bugloos-white);
  padding: var(--spacing-2) var(--spacing-4);
  text-decoration: none;
  border-radius: var(--radius-md);
  z-index: var(--z-tooltip);
  transition: top var(--transition-fast);
}

.header__skip-link:focus {
  top: var(--spacing-2);
}

/* ===== PERFORMANCE OPTIMIZATIONS ===== */
/* Preload critical styles */
.header,
.header__logo-text,
.header__nav-link {
  contain: layout;
}

/* GPU acceleration for smooth transitions */
.header,
.header__cta-button,
.header__mobile-toggle,
.header__hamburger-line,
.header__nav,
.header__nav-item {
  will-change: transform, background-color, color;
  transform: translateZ(0);
}

/* ===== ACCESSIBILITY & PERFORMANCE ===== */
/* Reduced motion preferences */
@media (prefers-reduced-motion: reduce) {
  .header__nav,
  .header__nav-item,
  .header__nav-link,
  .header__hamburger-line {
    transition: none !important;
    animation: none !important;
    transform: none !important;
  }
  
  .header__nav--open .header__nav-item {
    transition-delay: 0s !important;
  }
}

/* ===== PRINT STYLES ===== */
@media print {
  .header {
    position: static;
    box-shadow: none;
    border-bottom: 1px solid var(--bugloos-gray-300);
    background-color: transparent;
  }
  
  .header__mobile-toggle,
  .header__cta {
    display: none;
  }
  
  .header__nav {
    display: block;
    position: static;
  }
  
  .header__nav-list {
    flex-direction: row;
    gap: var(--spacing-4);
  }
}