/* ============================================
   Main Application Layout
   Navbar(top) + Sidebar(left) + Map(center) + Footer(bottom)
   ============================================ */

#app {
  display: grid;
  grid-template-rows: var(--navbar-height) 1fr var(--footer-height);
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "navbar navbar"
    "sidebar main"
    "footer footer";
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}

/* --- Navbar --- */
.navbar {
  grid-area: navbar;
  display: flex;
  align-items: center;
  background: var(--navbar-bg);
  border-bottom: 1px solid var(--navbar-border);
  z-index: var(--z-navbar);
  padding: 0;
  height: var(--navbar-height);
}

/* --- Sidebar --- */
.sidebar {
  grid-area: sidebar;
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  border-right: 1px solid var(--sidebar-border);
  z-index: var(--z-sidebar);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: width var(--transition-normal);
}

.sidebar.collapsed {
  width: var(--sidebar-collapsed-width);
}

/* --- Main Content (Map/Pages) --- */
.main-content {
  grid-area: main;
  position: relative;
  overflow: hidden;
  background: #e5e3df;
}

/* --- Footer --- */
.footer {
  grid-area: footer;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--footer-bg);
  color: var(--footer-text);
  font-size: var(--font-size-xs);
  z-index: var(--z-navbar);
  padding: 0 var(--spacing-lg);
  gap: var(--spacing-lg);
}

/* --- Page Container (for non-map views) --- */
.page-container {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: #f5f7fa;
  overflow-y: auto;
  padding: var(--spacing-xl);
  display: none;
}

.page-container.active {
  display: block;
}

/* --- Map Container --- */
#map-container {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
}

#map-container.hidden {
  display: none;
}

/* --- Responsive: Tablet (1024px) --- */
@media (max-width: 1024px) {
  .sidebar {
    width: 320px;
  }
}

/* --- Responsive: Mobile (768px) --- */
@media (max-width: 768px) {
  :root {
    --navbar-height: 52px;
    --footer-height: 50px;
  }

  #app {
    grid-template-columns: 1fr;
    grid-template-rows: var(--navbar-height) 1fr var(--footer-height);
    grid-template-areas:
      "navbar"
      "main"
      "footer";
  }

  /* Sidebar: Full-screen overlay on mobile */
  .sidebar {
    position: fixed;
    top: var(--navbar-height);
    left: 0;
    bottom: var(--footer-height);
    width: 100%;
    max-width: 100%;
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
    z-index: var(--z-sidebar);
    box-shadow: none;
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: var(--shadow-xl);
  }

  /* Sidebar backdrop */
  .sidebar-backdrop {
    display: none;
    position: fixed;
    top: var(--navbar-height);
    left: 0;
    right: 0;
    bottom: var(--footer-height);
    background: rgba(0, 0, 0, 0.5);
    z-index: calc(var(--z-sidebar) - 1);
    opacity: 0;
    transition: opacity var(--transition-normal);
  }

  .sidebar-backdrop.active {
    display: block;
    opacity: 1;
  }

  /* Footer stacks vertically on mobile */
  .footer {
    flex-wrap: wrap;
    justify-content: center !important;
    padding: var(--spacing-xs) var(--spacing-sm);
    gap: var(--spacing-xs);
    height: auto;
    min-height: var(--footer-height);
  }

  /* Pages: tighter padding for mobile */
  .page-container {
    padding: var(--spacing-md);
  }
}

/* --- Responsive: Small phones (480px) --- */
@media (max-width: 480px) {
  .page-container {
    padding: var(--spacing-sm);
  }
}