/**
 * 📱 BesserGrowen Messenger - Main App Styles
 * Mobile-first, app-like design
 */

/* ========================================
   LOADING SCREEN
   ======================================== */
.loading-screen {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-6);
  background: var(--gradient-primary);
  background-size: 200% 200%;
  animation: gradientShift 3s ease infinite;
}

.loading-logo {
  position: relative;
}

.logo-gradient {
  padding: var(--space-8);
  background: var(--glass-backdrop);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border-light);
  border-radius: var(--radius-3xl);
  box-shadow: var(--shadow-2xl);
}

.logo-text {
  font-family: var(--font-display);
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-extrabold);
  background: linear-gradient(45deg, #fff, rgba(255,255,255,0.8));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 0.1em;
}

.loading-spinner {
  width: 48px;
  height: 48px;
  border: 3px solid rgba(255, 255, 255, 0.2);
  border-top-color: var(--white);
  border-radius: var(--radius-full);
  animation: spin 0.8s linear infinite;
}

.loading-text {
  color: var(--white);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  opacity: 0.9;
}

/* ========================================
   APP LAYOUT
   ======================================== */
.app-container {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--bg-primary);
}

/* Header */
.app-header {
  position: sticky;
  top: 0;
  z-index: var(--z-fixed);
  height: var(--mobile-header-height);
  padding-top: var(--safe-area-inset-top);
  background: var(--glass-backdrop);
  backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--border-light);
}

.app-header-inner {
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-4);
}

.app-header-title {
  font-family: var(--font-display);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Main content */
.app-main {
  flex: 1;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

/* Bottom navigation */
.app-bottom-nav {
  position: sticky;
  bottom: 0;
  z-index: var(--z-fixed);
  height: var(--mobile-bottom-nav-height);
  padding-bottom: var(--safe-area-inset-bottom);
  background: var(--glass-backdrop);
  backdrop-filter: var(--glass-blur);
  border-top: 1px solid var(--border-light);
}

.app-bottom-nav-inner {
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding: 0 var(--space-4);
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2);
  color: var(--text-muted);
  transition: color var(--duration-fast) var(--ease-out);
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

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

.nav-item-icon {
  font-size: var(--font-size-2xl);
}

.nav-item-label {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
}

.nav-item-badge {
  position: absolute;
  top: 0;
  right: 0;
  min-width: 18px;
  height: 18px;
  padding: 0 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--error);
  color: var(--white);
  font-size: 11px;
  font-weight: var(--font-weight-bold);
  border-radius: var(--radius-full);
  box-shadow: 0 0 0 2px var(--bg-primary);
}

/* ========================================
   GLASSMORPHISM CARDS
   ======================================== */
.glass-card {
  background: var(--glass-backdrop);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border-light);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg);
}

.glass-card-hover {
  transition: transform var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
}

@media (hover: hover) {
  .glass-card-hover:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
  }
}

/* ========================================
   BUTTONS
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-xl);
  transition: all var(--duration-fast) var(--ease-out);
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--white);
  box-shadow: var(--shadow-md);
}

.btn-primary:active {
  transform: scale(0.98);
  box-shadow: var(--shadow-sm);
}

.btn-secondary {
  background: var(--glass-backdrop);
  backdrop-filter: var(--glass-blur);
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
}

.btn-ghost {
  background: transparent;
  color: var(--text-primary);
}

.btn-icon {
  width: 44px;
  height: 44px;
  padding: 0;
  border-radius: var(--radius-full);
}

/* ========================================
   RESPONSIVE
   ======================================== */
@media (min-width: 768px) {
  .app-header-inner,
  .app-main,
  .app-bottom-nav-inner {
    max-width: 800px;
    margin: 0 auto;
  }
}

@media (min-width: 1024px) {
  .app-header-inner,
  .app-main,
  .app-bottom-nav-inner {
    max-width: 1200px;
  }
  
  .app-bottom-nav {
    display: none; /* Desktop: sidebar navigation instead */
  }
}