/* Three Panel Layout */
.app-layout {
  --nav-panel-width: 250px;
  --inspector-panel-width: 350px;
  display: grid;
  grid-template-columns: var(--nav-panel-width) 1fr var(--inspector-panel-width);
  grid-template-areas: "nav main inspector";
  min-height: 100vh;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  transition: grid-template-columns 0.28s ease;
}

.nav-panel {
  grid-area: nav;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border);
  overflow-x: hidden;
}

.nav-panel-controls {
  display: flex;
  justify-content: flex-end;
  padding: 1rem;
  border-bottom: 1px solid var(--border);
  background-color: var(--bg-secondary);
}

.nav-panel-content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
}

.nav-collapse-toggle {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--bg-primary);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.nav-collapse-toggle:hover {
  border-color: var(--border-hover);
  background: var(--bg-hover);
  color: var(--text-primary);
}

.main-panel {
  grid-area: main;
  background-color: var(--bg-primary);
  min-width: 0;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 2rem;
}

.inspector-panel {
  grid-area: inspector;
  background-color: var(--bg-secondary);
  border-left: 1px solid var(--border);
  min-width: 0;
  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;
}

@media (min-width: 1025px) {
  .app-layout.has-collapsed-nav {
    --nav-panel-width: 72px;
  }

  .nav-panel.is-collapsed .nav-panel-controls {
    justify-content: center;
    padding-left: 0.75rem;
    padding-right: 0.75rem;
  }
}

/* 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 auto;
    grid-template-areas:
      "header"
      "main";
    min-height: 100dvh;
    height: auto;
    overflow: visible;
    align-content: start;
  }

  .nav-panel {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: min(var(--nav-panel-width), calc(100vw - 2.5rem));
    max-width: calc(100vw - 1rem);
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    z-index: 200;
    box-shadow: var(--shadow-lg);
  }

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

  .nav-panel-controls {
    display: none;
  }

  .inspector-panel {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(var(--inspector-panel-width), calc(100vw - 1rem));
    max-width: calc(100vw - 0.75rem);
    transform: translateX(100%);
    transition: transform 0.3s ease;
    z-index: 100;
    box-shadow: var(--shadow-lg);
  }

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

  .main-panel {
    overflow: visible;
    padding: 1.5rem;
  }
}

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

  .nav-panel-controls {
    display: none;
  }

  .main-panel {
    overflow: visible;
    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;
}


/* Mobile Inspector Header */
.inspector-mobile-header {
  display: none;
  align-items: center;
  justify-content: space-between;
  margin: -1.5rem -1.5rem 1rem;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
  background-color: var(--bg-secondary);
  position: sticky;
  top: 0;
  z-index: 1;
}

.inspector-mobile-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-heading);
  margin: 0;
}

@media (max-width: 1024px) {
  .inspector-mobile-header {
    display: flex;
  }
}

/* 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);
}