/* Root app layout */
.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--me-bg-primary);
  color: var(--me-text-primary);
  transition: background-color 0.2s, color 0.2s;
}

/* Theme variables */
.app.light {
  --me-bg-primary: #ffffff;
  --me-bg-secondary: #f8f9fa;
  --me-text-primary: #212529;
  --me-text-secondary: #6c757d;
  --me-border: #dee2e6;
  --me-accent: #0d6efd;
  --me-accent-hover: #0b5ed7;
}
.app.dark {
  --me-bg-primary: #16181c;
  --me-bg-secondary: #21232a;
  --me-text-primary: #f3f4f6;
  --me-text-secondary: #8e99af;
  --me-border: #252736;
  --me-accent: #FFD600;
  --me-accent-hover: #FFB300;
}


/* Header */
.app-header {
  flex: 0 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background-color: var(--me-bg-secondary);
  border-bottom: 1px solid var(--me-border);
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  z-index: 10;
}
.app-header h1 {
  margin: 0;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--me-text-primary);
}

/* App controls */
.app-controls {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.source-toggle,
.theme-toggle {
  background: none;
  border: 2px solid var(--me-border);
  border-radius: 8px;
  padding: 0.5rem 1rem;
  font-size: 1.2rem;
  cursor: pointer;
  transition: all 0.2s;
  color: var(--me-text-primary);
  background-color: var(--me-bg-primary);
}
.theme-toggle:hover, .theme-toggle:focus {
  border-color: var(--me-accent);
  box-shadow: 0 2px 8px rgba(0,0,0,0.10);
  outline: none;
}

/* Main content: split layout, fills all remaining height */
.app-main {
  flex: 1 1 auto;
  display: flex;
  min-height: 0;
  overflow: hidden;
  width: 100%;
}

/* MarkdownExplorer main container */
.demo-explorer {
  flex: 1 1 auto;
  display: flex;
  min-width: 0;
  min-height: 0;
}

/* Sidebar (file tree) */
.demo-explorer [class*="sidebar"] {
  min-width: 220px;
  max-width: 340px;
  width: 280px;
  flex: 0 0 280px;
  height: 100%;
  min-height: 0;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--me-border);
  background: var(--me-bg-secondary);
  overflow: hidden;
}

/* Sidebar scroll area */
.demo-explorer [class*="sidebarContent"] {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 8px 0;
  scrollbar-width: thin;
  scrollbar-color: var(--me-text-secondary) transparent;
}
.demo-explorer [class*="sidebarContent"]::-webkit-scrollbar {
  width: 6px;
}
.demo-explorer [class*="sidebarContent"]::-webkit-scrollbar-thumb {
  background: var(--me-text-secondary);
  border-radius: 3px;
  opacity: 0.5;
  transition: opacity 0.2s;
}
.demo-explorer [class*="sidebarContent"]:hover::-webkit-scrollbar-thumb {
  opacity: 1;
}

/* Main content viewer */
.demo-explorer [class*="mainContent"] {
  flex: 1 1 auto;
  min-width: 0;
  min-height: 0;
  overflow-y: auto;
  padding: 24px 24px;
  background: var(--me-bg-primary);
}

/* Footer */
.app-footer {
  flex: 0 0 auto;
  padding: 1rem 2rem;
  background-color: var(--me-bg-secondary);
  border-top: 1px solid var(--me-border);
  text-align: center;
  z-index: 10;
}
.app-footer p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--me-text-secondary);
}
.app-footer strong {
  color: var(--me-accent);
  font-weight: 600;
}

/* Responsive design */
@media (max-width: 900px) {
  .app-header, .app-footer { padding: 0.75rem 1rem; }
  .app-header h1 { font-size: 1.25rem; }
  .theme-toggle { padding: 0.4rem 0.8rem; font-size: 1rem; }
  .demo-explorer [class*="sidebar"] {
    min-width: 140px; max-width: 200px; width: 160px; flex-basis: 160px;
  }
}
@media (max-width: 700px) {
  .app-main, .demo-explorer { flex-direction: column; }
  .demo-explorer [class*="sidebar"] { width: 100%; max-width: 100%; min-width: 0; flex-basis: auto; border-right: none; border-bottom: 1px solid var(--me-border); }
  .demo-explorer [class*="mainContent"] { padding: 12px 6px; }
}

/* Accessibility & Transitions */
*:focus {
  outline: 2px solid var(--me-accent);
  outline-offset: 2px;
}
* {
  transition: background-color 0.2s, border-color 0.2s, color 0.2s;
}