/**
 * Top Navigation Bar Styles
 * Fixed header with logo, channel name, and user controls
 */

/* ============================================
   Top Navigation Bar
   ============================================ */

.top-nav {
  height: var(--top-nav-height);
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-lg);
  position: sticky;
  top: 0;
  z-index: var(--z-top-nav);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.05);
}

/* ============================================
   Left Section - Logo and Hamburger Menu
   ============================================ */

.top-nav-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex: 0 0 auto;
}

.app-logo {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary-purple);
  text-decoration: none;
  cursor: pointer;
  transition: opacity 0.2s ease;
}

.app-logo:hover {
  opacity: 0.8;
}

/* Hamburger Menu Button */
.hamburger-menu {
  display: none; /* Hidden on desktop, shown on tablet/mobile */
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  width: 40px;
  height: 40px;
  position: relative;
  transition: all 0.2s ease;
  border-radius: 4px;
}

.hamburger-menu:hover {
  background: rgba(0, 0, 0, 0.05);
}

.hamburger-menu:focus-visible {
  outline: 2px solid var(--color-primary-purple);
  outline-offset: 2px;
}

/* Hamburger icon lines */
.hamburger-icon {
  display: block;
  position: relative;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  transition: all var(--transition-speed) var(--transition-timing);
}

.hamburger-icon::before,
.hamburger-icon::after {
  content: '';
  position: absolute;
  left: 0;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  transition: all var(--transition-speed) var(--transition-timing);
}

.hamburger-icon::before {
  top: -8px;
}

.hamburger-icon::after {
  top: 8px;
}

/* Hamburger animation to X when open */
.hamburger-menu.open .hamburger-icon {
  background: transparent;
}

.hamburger-menu.open .hamburger-icon::before {
  top: 0;
  transform: rotate(45deg);
}

.hamburger-menu.open .hamburger-icon::after {
  top: 0;
  transform: rotate(-45deg);
}

/* ============================================
   Center Section - Channel Name
   ============================================ */

.top-nav-center {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}

.channel-name {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-text-secondary);
  max-width: 300px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ============================================
   Right Section - Connection, Install, User Menu
   ============================================ */

.top-nav-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  flex: 0 0 auto;
}

/* User Avatar Dropdown Trigger */
.user-menu-trigger {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-primary-purple);
  color: var(--color-white);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 14px;
  transition: all 0.2s ease;
  position: relative;
}

.user-menu-trigger:hover {
  background: var(--color-sidebar-hover);
  transform: scale(1.05);
}

.user-menu-trigger:focus-visible {
  outline: 2px solid var(--color-primary-purple);
  outline-offset: 2px;
}

/* User avatar image */
.user-menu-trigger img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
}

/* User Menu Dropdown */
.user-menu-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  min-width: 200px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: all 0.2s ease;
  z-index: 1001;
}

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

.user-menu-dropdown a,
.user-menu-dropdown button {
  display: block;
  width: 100%;
  padding: 12px 16px;
  text-align: left;
  text-decoration: none;
  color: var(--color-text-primary);
  background: transparent;
  border: none;
  cursor: pointer;
  font-size: 15px;
  transition: background 0.2s ease;
}

.user-menu-dropdown a:hover,
.user-menu-dropdown button:hover {
  background: var(--color-background);
}

.user-menu-dropdown a:first-child,
.user-menu-dropdown button:first-child {
  border-radius: 8px 8px 0 0;
}

.user-menu-dropdown a:last-child,
.user-menu-dropdown button:last-child {
  border-radius: 0 0 8px 8px;
}

/* ============================================
   Responsive Design
   ============================================ */

/* Tablet and Mobile - Show hamburger menu */
@media (max-width: 1024px) {
  .hamburger-menu {
    display: flex;
    align-items: center;
    justify-content: center;
  }
}

/* Mobile - Adjust spacing and font sizes */
@media (max-width: 767px) {
  .top-nav {
    padding: 0 var(--spacing-md);
  }

  .app-logo {
    font-size: 20px;
  }

  .channel-name {
    font-size: 16px;
    max-width: 150px;
  }

  .top-nav-right {
    gap: var(--spacing-sm);
  }
}

/* Very small screens - Hide channel name */
@media (max-width: 480px) {
  .channel-name {
    display: none;
  }
}

/* ============================================
   Accessibility
   ============================================ */

/* Skip to main content link (for keyboard users) */
.skip-to-main {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary-purple);
  color: var(--color-white);
  padding: 8px 16px;
  text-decoration: none;
  border-radius: 0 0 4px 0;
  z-index: 1002;
  transition: top 0.2s ease;
}

.skip-to-main:focus {
  top: 0;
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  .hamburger-icon,
  .hamburger-icon::before,
  .hamburger-icon::after,
  .user-menu-dropdown {
    transition: none;
  }
}