/* Three Panel Layout */
.app-layout {
  display: grid;
  grid-template-columns: 250px 1fr 350px;
  grid-template-areas: "nav main inspector";
  height: 100vh;
  overflow: hidden;
}

.nav-panel {
  grid-area: nav;
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  overflow-x: hidden;
}

.main-panel {
  grid-area: main;
  background-color: var(--bg-primary);
  overflow-y: auto;
  overflow-x: hidden;
  padding: 2rem;
}

.inspector-panel {
  grid-area: inspector;
  background-color: var(--bg-secondary);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  overflow-x: hidden;
  padding: 1.5rem;
}

/* Mobile Header - Mobile-first base styles */
.mobile-header {
  grid-area: header;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
}

/* Responsive Breakpoints */

/* Tablet: Hide inspector by default, show as overlay when toggled */
@media (max-width: 1024px) {
  .app-layout {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
    grid-template-areas:
      "header"
      "main";
  }

  .nav-panel {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 250px;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 200;
    box-shadow: var(--shadow-lg);
  }

  .nav-panel.is-open {
    transform: translateX(0);
  }

  .inspector-panel {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 350px;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    z-index: 100;
    box-shadow: var(--shadow-lg);
  }

  .inspector-panel.is-open {
    transform: translateX(0);
  }
}

/* Mobile: Hamburger nav, full-width main */
@media (max-width: 768px) {
  .app-layout {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
    grid-template-areas:
      "header"
      "main";
  }

  .nav-panel {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 250px;
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 200;
    box-shadow: var(--shadow-lg);
  }

  .nav-panel.is-open {
    transform: translateX(0);
  }

  .main-panel {
    padding: 1rem;
  }
}

/* Desktop: Hide mobile header */
@media (min-width: 769px) {
  .mobile-header {
    display: none;
  }
}

/* Overlay for mobile menus */
.overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 90;
}

.overlay.is-active {
  display: block;
}

/* Panel Headers */
.panel-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1rem;
}

.panel-header h2 {
  margin: 0;
}

/* Content Sections */
.content-section {
  margin-bottom: 2rem;
}

.content-section:last-child {
  margin-bottom: 0;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.section-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-heading);
}