/* =============================================
   layout.css - App Shell & Page Layout
   House Expense Management
   ============================================= */

/* --- App Container --- */
#app {
  max-width: var(--max-container);
  margin: 0 auto;
  min-height: 100vh;
  min-height: 100dvh;
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--color-bg-primary);
}

/* --- Top Navigation Bar --- */
#top-nav {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  padding: 0 var(--space-4);
  gap: var(--space-3);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex: 1;
  min-width: 0;
}

.nav-logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--color-accent-blue), var(--color-accent-purple));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: white;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.nav-title {
  font-size: var(--text-sm);
  font-weight: var(--font-semi);
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-subtitle {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: -1px;
}

/* --- Auth/User Menu --- */
#auth-user-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

#auth-user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-bg-secondary);
  color: var(--color-accent-blue);
  border: 1px solid var(--color-border);
  font-size: 13px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

#auth-user-avatar:active {
  transform: scale(0.95);
  background: var(--color-bg-tertiary);
}

#auth-user-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 180px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-dropdown);
  overflow: hidden;
  animation: dropIn 0.2s ease;
}

@keyframes dropIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

#auth-user-dropdown.open { display: block; }

.auth-dropdown-email {
  padding: 12px 16px;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
}

.auth-dropdown-item {
  width: 100%;
  padding: 12px 16px;
  text-align: left;
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  transition: background var(--transition-fast);
}

.auth-dropdown-item:active { background: var(--color-bg-hover); }

/* --- Page System --- */
.page {
  flex: 1;
  padding: var(--space-4);
  padding-bottom: calc(var(--bottom-bar) + var(--space-6));
  animation: fadeIn 0.3s ease;
  display: none;
}

.page.active { display: block; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --- Bottom Navigation --- */
#bottom-nav {
  position: fixed;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  max-width: var(--max-container);
  height: var(--bottom-bar);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-around;
  z-index: var(--z-sticky);
  padding-bottom: env(safe-area-inset-bottom);
}

.bottom-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
  flex: 1;
  height: 100%;
}

.bottom-nav-item .nav-icon {
  font-size: 20px;
  line-height: 1;
}

.bottom-nav-item .nav-label {
  font-size: 10px;
  font-weight: var(--font-medium);
}

.bottom-nav-item.active {
  color: var(--color-accent-blue);
}

.bottom-nav-item.active .nav-icon {
  transform: translateY(-1px);
}

/* Safe Area Support */
@supports (padding: max(0px)) {
  #bottom-nav {
    padding-bottom: max(0px, env(safe-area-inset-bottom));
    height: calc(var(--bottom-bar) + env(safe-area-inset-bottom));
  }
}

/* Mobile FAB for adding records */
.fab-container {
  position: fixed;
  bottom: calc(var(--bottom-bar) + 20px + env(safe-area-inset-bottom));
  right: 20px;
  z-index: var(--z-sticky);
}

.btn-fab {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--color-accent-blue);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  box-shadow: 0 4px 16px rgba(59, 130, 246, 0.4);
  transition: all var(--transition-fast);
}

.btn-fab:active {
  transform: scale(0.9) rotate(90deg);
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}