/* ============================================
   Qr Generator MAX - Header Styles
   ============================================ */

/* Header Base */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  height: var(--header-height-mobile);
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-light);
  transition: transform var(--transition-base), 
              background-color var(--transition-base),
              border-color var(--transition-base);
}

@media (min-width: 768px) {
  .header {
    height: var(--header-height);
  }
}

/* Header Hidden State (scroll down) */
.header--hidden {
  transform: translateY(-100%);
}

/* Header Visible State (scroll up) */
.header--visible {
  transform: translateY(0);
}

/* Header with backdrop blur when scrolled */
.header--scrolled {
  background-color: rgba(var(--bg-primary), 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-md);
}

/* Header Container */
.header__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

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

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

/* ============================================
   Logo
   ============================================ */

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.025em;
  transition: color var(--transition-fast);
}

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

.header__logo-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-lg);
  object-fit: contain;
}

@media (min-width: 768px) {
  .header__logo {
    font-size: var(--text-2xl);
  }
  
  .header__logo-icon {
    width: 36px;
    height: 36px;
  }
}

/* ============================================
   Navigation (Desktop)
   ============================================ */

.header__nav {
  display: none;
}

@media (min-width: 1024px) {
  .header__nav {
    display: flex;
    align-items: center;
    gap: var(--space-1);
  }
}

.header__nav-link {
  position: relative;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast),
              background-color var(--transition-fast);
}

.header__nav-link:hover {
  color: var(--text-primary);
  background-color: var(--bg-tertiary);
}

.header__nav-link--active {
  color: var(--primary);
  background-color: rgba(99, 102, 241, 0.1);
}

.header__nav-link--active:hover {
  color: var(--primary-dark);
  background-color: rgba(99, 102, 241, 0.15);
}

/* ============================================
   Header Actions (Toggle + Hamburger)
   ============================================ */

.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

@media (min-width: 1024px) {
  .header__actions {
    gap: var(--space-4);
  }
}

/* ============================================
   Dark/Light Mode Toggle (iPhone Style)
   ============================================ */

.theme-toggle {
  position: relative;
  width: 52px;
  height: 28px;
  background-color: var(--bg-tertiary);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: background-color var(--transition-base);
  border: 2px solid var(--border-medium);
}

.theme-toggle:hover {
  border-color: var(--border-dark);
}

.theme-toggle__track {
  position: absolute;
  inset: 0;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.theme-toggle--active .theme-toggle__track {
  opacity: 1;
}

.theme-toggle__thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  background-color: white;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-bounce);
}

.theme-toggle--active .theme-toggle__thumb {
  transform: translateX(24px);
}

/* ============================================
   Hamburger Menu Button
   ============================================ */

.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  padding: var(--space-2);
  background: transparent;
  border: none;
  cursor: pointer;
  position: relative;
  z-index: calc(var(--z-header) + 10);
}

@media (min-width: 1024px) {
  .hamburger {
    display: none;
  }
}

.hamburger__line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  border-radius: var(--radius-full);
  transition: transform var(--transition-base),
              opacity var(--transition-base),
              background-color var(--transition-fast);
  position: absolute;
}

.hamburger__line:nth-child(1) {
  transform: translateY(-7px);
}

.hamburger__line:nth-child(2) {
  transform: translateY(0);
}

.hamburger__line:nth-child(3) {
  transform: translateY(7px);
}

/* Hamburger Active State (X shape) */
.hamburger--active .hamburger__line:nth-child(1) {
  transform: translateY(0) rotate(45deg);
}

.hamburger--active .hamburger__line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.hamburger--active .hamburger__line:nth-child(3) {
  transform: translateY(0) rotate(-45deg);
}

/* ============================================
   Mobile Menu
   ============================================ */

.mobile-menu {
  position: fixed;
  top: var(--header-height-mobile);
  left: 0;
  right: 0;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-light);
  box-shadow: var(--shadow-lg);
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  transition: transform var(--transition-base),
              opacity var(--transition-base),
              visibility var(--transition-base);
  z-index: calc(var(--z-header) - 1);
  max-height: calc(100vh - var(--header-height-mobile));
  overflow-y: auto;
}

@media (min-width: 768px) {
  .mobile-menu {
    top: var(--header-height);
    max-height: calc(100vh - var(--header-height));
  }
}

.mobile-menu--open {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.mobile-menu__container {
  padding: var(--space-6) var(--space-4);
  max-width: 1280px;
  margin: 0 auto;
}

@media (min-width: 640px) {
  .mobile-menu__container {
    padding: var(--space-8) var(--space-6);
  }
}

.mobile-menu__nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.mobile-menu__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  transition: background-color var(--transition-fast),
              color var(--transition-fast),
              transform var(--transition-fast);
}

.mobile-menu__link:hover {
  background-color: var(--bg-tertiary);
  color: var(--primary);
  transform: translateX(4px);
}

.mobile-menu__link--active {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(6, 182, 212, 0.1) 100%);
  color: var(--primary);
  border: 1px solid rgba(99, 102, 241, 0.2);
}

.mobile-menu__link-arrow {
  width: 20px;
  height: 20px;
  opacity: 0.5;
  transition: opacity var(--transition-fast),
              transform var(--transition-fast);
}

.mobile-menu__link:hover .mobile-menu__link-arrow {
  opacity: 1;
  transform: translateX(4px);
}

/* Mobile Menu Overlay */
.mobile-menu__overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base),
              visibility var(--transition-base);
  z-index: calc(var(--z-header) - 2);
}

.mobile-menu__overlay--visible {
  opacity: 1;
  visibility: visible;
}

/* Prevent body scroll when menu is open */
body.menu-open {
  overflow: hidden;
}

/* ============================================
   Page Content Spacing (for fixed header)
   ============================================ */

.page-content {
  padding-top: var(--header-height-mobile);
}

@media (min-width: 768px) {
  .page-content {
    padding-top: var(--header-height);
  }
}