/* ============================================
   thynkLab - Header Navigation
   Floating top navigation bar with glassmorphism
   ============================================ */

/* ============================================
   HEADER CONTAINER
   ============================================ */

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-fixed);
  padding: var(--space-lg) 0;
  transition: all var(--transition-base);
  pointer-events: none;
}

.header-inner {
  max-width: var(--max-w-screen-2xl);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  pointer-events: all;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-xl);
  background: rgba(10, 10, 15, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xl);
  transition: all var(--transition-base);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.2);
}

/* Scrolled State */
.header.scrolled {
  padding: var(--space-sm) 0;
}

.header.scrolled .header-content {
  background: rgba(10, 10, 15, 0.95);
  border-color: var(--color-border-primary);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.4);
}

/* ============================================
   LOGO
   ============================================ */

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-2xl);
  font-weight: var(--font-black);
  letter-spacing: var(--tracking-tight);
  background: var(--gradient-cosmic);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% 200%;
  animation: gradientShift 5s ease infinite;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
}

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

/* Logo Icon (optional) */
.logo-icon {
  width: 32px;
  height: 32px;
  background: var(--gradient-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xl);
  box-shadow: 0 4px 15px rgba(0, 217, 255, 0.3);
}

/* ============================================
   NAVIGATION MENU (Desktop)
   ============================================ */

.nav-menu {
  display: none;
  align-items: center;
  gap: var(--space-xl);
}

.nav-link {
  position: relative;
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  padding: var(--space-sm) 0;
  transition: all var(--transition-base);
  cursor: pointer;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width var(--transition-base);
}

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

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

/* Show nav menu on larger screens */
@media (min-width: 1024px) {
  .nav-menu {
    display: flex;
  }
}

/* ============================================
   AUTH BUTTONS
   ============================================ */

.auth-buttons {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.header .btn {
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--text-sm);
}

.header .btn-ghost {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-border-subtle);
}

.header .btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--color-accent-cyan);
}

.header .btn-primary {
  box-shadow: 0 4px 15px rgba(0, 217, 255, 0.3);
}

/* ============================================
   MOBILE MENU TOGGLE
   ============================================ */

.menu-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  height: 24px;
  cursor: pointer;
  transition: all var(--transition-base);
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 3px;
  background: var(--color-text-primary);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
}

.menu-toggle:hover span {
  background: var(--color-accent-cyan);
}

/* Menu Toggle Active State */
.menu-toggle.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

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

.menu-toggle.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Hide on desktop */
@media (min-width: 1024px) {
  .menu-toggle {
    display: none;
  }
}

/* ============================================
   MOBILE MENU OVERLAY
   ============================================ */

.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: rgba(10, 10, 15, 0.98);
  backdrop-filter: blur(20px);
  z-index: calc(var(--z-fixed) - 1);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-2xl);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.mobile-menu.active {
  opacity: 1;
  pointer-events: all;
}

.mobile-menu .nav-link {
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--transition-base);
}

.mobile-menu.active .nav-link {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered animation for mobile menu items */
.mobile-menu.active .nav-link:nth-child(1) { transition-delay: 0.1s; }
.mobile-menu.active .nav-link:nth-child(2) { transition-delay: 0.2s; }
.mobile-menu.active .nav-link:nth-child(3) { transition-delay: 0.3s; }
.mobile-menu.active .nav-link:nth-child(4) { transition-delay: 0.4s; }
.mobile-menu.active .nav-link:nth-child(5) { transition-delay: 0.5s; }

.mobile-menu .auth-buttons {
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--transition-base);
  transition-delay: 0.6s;
}

.mobile-menu.active .auth-buttons {
  opacity: 1;
  transform: translateY(0);
}

/* Hide mobile menu on desktop */
@media (min-width: 1024px) {
  .mobile-menu {
    display: none;
  }
}

/* ============================================
   USER PROFILE (Logged In State)
   ============================================ */

.user-profile {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  cursor: pointer;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
}

.user-profile:hover {
  background: rgba(255, 255, 255, 0.05);
}

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-bold);
  font-size: var(--text-base);
  border: 2px solid var(--color-border-primary);
  overflow: hidden;
}

.user-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.user-name {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  display: none;
}

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

/* ============================================
   NOTIFICATION BELL
   ============================================ */

.notification-bell {
  position: relative;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-border-subtle);
  cursor: pointer;
  transition: all var(--transition-base);
  font-size: var(--text-xl);
}

.notification-bell:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--color-accent-cyan);
  color: var(--color-accent-cyan);
  transform: scale(1.05);
}

/* Notification Badge */
.notification-badge {
  position: absolute;
  top: -4px;
  right: -4px;
  width: 20px;
  height: 20px;
  background: var(--color-accent-pink);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xs);
  font-weight: var(--font-bold);
  border: 2px solid var(--color-bg-primary);
  animation: pulse 2s ease-in-out infinite;
}

/* ============================================
   SEARCH BAR (Optional)
   ============================================ */

.header-search {
  display: none;
  position: relative;
  flex: 1;
  max-width: 400px;
  margin: 0 var(--space-xl);
}

.header-search input {
  width: 100%;
  padding: var(--space-sm) var(--space-lg) var(--space-sm) var(--space-3xl);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-full);
  color: var(--color-text-primary);
  font-size: var(--text-sm);
  transition: all var(--transition-base);
}

.header-search input:focus {
  outline: none;
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--color-accent-cyan);
  box-shadow: 0 0 0 3px rgba(0, 217, 255, 0.1);
}

.header-search-icon {
  position: absolute;
  left: var(--space-lg);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  font-size: var(--text-lg);
  pointer-events: none;
}

@media (min-width: 1280px) {
  .header-search {
    display: block;
  }
}

/* ============================================
   HEADER ACTIONS (Right Side)
   ============================================ */

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

/* ============================================
   PROGRESS BAR (Page Loading)
   ============================================ */

.header-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: transparent;
  overflow: hidden;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.header-progress.active {
  opacity: 1;
}

.header-progress-bar {
  height: 100%;
  background: var(--gradient-primary);
  width: 0%;
  transition: width 0.3s ease;
  position: relative;
}

.header-progress-bar::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.5),
    transparent
  );
  animation: shimmer 1s infinite;
}

/* ============================================
   RESPONSIVE ADJUSTMENTS
   ============================================ */

@media (max-width: 768px) {
  .header-content {
    padding: var(--space-sm) var(--space-lg);
  }
  
  .logo {
    font-size: var(--text-xl);
  }
  
  .auth-buttons .btn:not(.btn-primary) {
    display: none;
  }
  
  .auth-buttons .btn-primary {
    padding: var(--space-sm) var(--space-md);
    font-size: var(--text-xs);
  }
}

@media (max-width: 480px) {
  .header-inner {
    padding: 0 var(--space-md);
  }
  
  .logo {
    font-size: var(--text-lg);
  }
  
  .logo-icon {
    width: 28px;
    height: 28px;
    font-size: var(--text-lg);
  }
}

/* ============================================
   SPECIAL STATES
   ============================================ */

/* Transparent Header (for hero section) */
.header.transparent {
  background: transparent;
}

.header.transparent .header-content {
  background: rgba(10, 10, 15, 0.3);
  border-color: rgba(255, 255, 255, 0.05);
}

/* Dark Header (for light backgrounds) */
.header.dark .header-content {
  background: rgba(10, 10, 15, 0.98);
  border-color: var(--color-border-primary);
}

/* Header with shadow (always visible) */
.header.shadow .header-content {
  box-shadow: 0 10px 50px rgba(0, 0, 0, 0.5);
}

/* LANDING PAGE OVERRIDE: remove nav menu */
.nav-menu {
  display: none !important;
}