/**
 * ============================================
 * APP CHROME & NAVIGATION - 2026 Design
 * ============================================
 *
 * Includes:
 * - App header
 * - Bottom navigation (mobile)
 * - Sidebar navigation (desktop)
 * - User menu dropdown
 * - Authentication screens
 */

/* ==========================================
   APP HEADER - Desktop/Tablet
   ========================================== */

.app-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: var(--glass-background);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-4) var(--space-6);
  animation: slide-down 0.4s var(--ease-smooth);
}

@keyframes slide-down {
  from {
    transform: translateY(-100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.app-header-content {
  max-width: var(--container-2xl);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.app-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  transition: transform var(--transition-fast);
}

.app-logo:hover {
  transform: scale(1.02);
}

.app-logo-icon {
  font-size: var(--text-3xl);
  line-height: 1;
}

.app-logo-text {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.app-user-profile {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2);
  border-radius: var(--radius-full);
  transition: background-color var(--transition-fast);
}

.app-user-profile:hover {
  background-color: var(--color-overlay);
}

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--color-border);
}

.user-info {
  display: none; /* Hidden on mobile */
}

@media (min-width: 768px) {
  .user-info {
    display: block;
    text-align: right;
  }
}

.user-name {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  line-height: 1.2;
}

.user-role {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
}

/* ==========================================
   USER MENU DROPDOWN
   ========================================== */

.user-menu-dropdown {
  position: fixed;
  top: calc(var(--space-16) + var(--space-2));
  right: var(--space-6);
  z-index: var(--z-dropdown);
  animation: fade-in-scale 0.2s var(--ease-smooth);
}

@keyframes fade-in-scale {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(-10px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.user-menu-content {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-border);
  padding: var(--space-2);
  min-width: 220px;
}

.user-menu-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: none;
  border: none;
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-primary);
  text-align: left;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.user-menu-item:hover {
  background-color: var(--color-overlay);
}

.user-menu-item svg {
  flex-shrink: 0;
  opacity: 0.6;
}

.user-menu-item-danger {
  color: var(--color-error-500);
}

.user-menu-item-danger:hover {
  background-color: var(--color-error-50);
}

.user-menu-divider {
  height: 1px;
  background-color: var(--color-border);
  margin: var(--space-2) 0;
}

/* ==========================================
   BOTTOM NAVIGATION - Mobile
   ========================================== */

.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  display: flex;
  background: var(--glass-background);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-top: 1px solid var(--color-border);
  padding: var(--space-2) var(--space-4) max(var(--space-2), env(safe-area-inset-bottom));
  box-shadow: var(--shadow-lg);
  animation: slide-up 0.4s var(--ease-smooth);
}

@keyframes slide-up {
  from {
    transform: translateY(100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

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

.nav-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2);
  color: var(--color-text-tertiary);
  text-decoration: none;
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
  position: relative;
}

.nav-item svg {
  transition: transform var(--transition-fast);
}

.nav-item:hover {
  color: var(--color-text-secondary);
  background-color: var(--color-overlay);
}

.nav-item.active {
  color: var(--color-primary-500);
}

.nav-item.active::before {
  content: '';
  position: absolute;
  top: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 32px;
  height: 3px;
  background: var(--color-primary-500);
  border-radius: var(--radius-full);
}

.nav-item.active svg {
  transform: scale(1.1);
}

/* ==========================================
   MAIN CONTENT AREA
   ========================================== */

.main-content {
  min-height: 100vh;
  padding-bottom: calc(80px + env(safe-area-inset-bottom)); /* Space for bottom nav */
}

@media (min-width: 1024px) {
  .main-content {
    padding-bottom: var(--space-6);
  }
}

/* ==========================================
   AUTHENTICATION SCREENS
   ========================================== */

.auth-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  position: relative;
  overflow: hidden;
}

.auth-background {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.auth-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.15;
  animation: float 20s ease-in-out infinite;
}

.auth-blob-1 {
  width: 400px;
  height: 400px;
  background: var(--color-primary-500);
  top: -200px;
  left: -200px;
}

.auth-blob-2 {
  width: 500px;
  height: 500px;
  background: var(--color-success-500);
  bottom: -250px;
  right: -250px;
  animation-delay: -5s;
}

.auth-blob-3 {
  width: 300px;
  height: 300px;
  background: var(--color-primary-300);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation-delay: -10s;
}

@keyframes float {
  0%, 100% {
    transform: translate(0, 0) scale(1);
  }
  33% {
    transform: translate(30px, -30px) scale(1.1);
  }
  66% {
    transform: translate(-20px, 20px) scale(0.9);
  }
}

.auth-card {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 480px;
  background: var(--glass-background);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-3xl);
  box-shadow: var(--shadow-2xl);
  overflow: hidden;
  animation: fade-in-up 0.6s var(--ease-smooth);
}

.auth-logo {
  text-align: center;
  padding: var(--space-8) var(--space-6) var(--space-6);
  background: linear-gradient(135deg, var(--color-primary-50) 0%, transparent 100%);
}

.logo-icon {
  font-size: 64px;
  margin-bottom: var(--space-4);
  animation: logo-bounce 1s var(--ease-spring);
}

@keyframes logo-bounce {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1);
  }
}

.logo-text {
  font-size: var(--text-4xl);
  font-weight: var(--font-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
  letter-spacing: -0.02em;
}

.logo-tagline {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  font-weight: var(--font-normal);
}

.auth-content {
  padding: var(--space-6);
}

.auth-title {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
  text-align: center;
}

.auth-description {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  text-align: center;
  margin-bottom: var(--space-8);
  line-height: var(--leading-relaxed);
}

.auth-button {
  width: 100%;
  margin-bottom: var(--space-6);
  font-size: var(--text-lg);
  padding: var(--space-4) var(--space-6);
}

.auth-features {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.feature-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.feature-icon {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-success-100);
  color: var(--color-success-600);
  border-radius: 50%;
  font-weight: var(--font-bold);
  font-size: var(--text-xs);
  flex-shrink: 0;
}

/* ==========================================
   SIDEBAR NAVIGATION - Desktop (Future)
   ========================================== */

@media (min-width: 1024px) {
  /* Sidebar implementation for desktop */
  /* To be added in future iteration */
}

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

@media (max-width: 640px) {
  .app-header {
    padding: var(--space-3) var(--space-4);
  }

  .app-logo-text {
    display: none;
  }

  .auth-card {
    border-radius: var(--radius-2xl);
  }

  .auth-logo {
    padding: var(--space-6) var(--space-4) var(--space-4);
  }

  .auth-content {
    padding: var(--space-4);
  }

  .logo-icon {
    font-size: 48px;
  }

  .logo-text {
    font-size: var(--text-3xl);
  }
}

/* ==========================================
   DARK MODE ADJUSTMENTS
   ========================================== */

@media (prefers-color-scheme: dark) {
  .auth-logo {
    background: linear-gradient(135deg, rgba(77, 158, 147, 0.1) 0%, transparent 100%);
  }

  .feature-icon {
    background: rgba(34, 197, 94, 0.2);
    color: var(--color-success-400);
  }
}

/* ==========================================
   REDUCED MOTION
   ========================================== */

@media (prefers-reduced-motion: reduce) {
  .app-header,
  .bottom-nav,
  .auth-card {
    animation: none;
  }

  .auth-blob {
    animation: none;
  }

  .logo-icon {
    animation: none;
  }
}