:root {
  --color-ruby: #CC342D;
  --color-ruby-light: rgba(204, 52, 45, 0.15);
  --color-bg: #FFFFFF;
  --color-bg-alt: #F7F7F7;
  --color-text: #3E4451;
  --color-text-light: #6B7280;
  --color-border: #E5E7EB;
  --color-highlight: rgba(204, 52, 45, 0.12);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: "Noto Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  color: var(--color-text);
  height: 100vh;
  display: flex;
  flex-direction: column;
}

:focus-visible {
  outline: 2px solid var(--color-ruby);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-ruby);
  color: white;
  padding: 0.5rem 1rem;
  z-index: 200;
  font-size: 0.875rem;
  text-decoration: none;
}

.skip-link:focus {
  left: 0;
}

nav {
  background: var(--color-ruby);
  color: white;
  padding: 0.5rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
  gap: 0.5rem;
}

nav h1 { font-size: 1.1rem; font-weight: 600; }
nav a { color: white; text-decoration: none; font-size: 0.8125rem; }
nav a:hover { text-decoration: underline; }
nav a:focus-visible { outline-color: white; }

.nav-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

@media (max-width: 540px) {
  .nav-version, .nav-right a { display: none; }
}

.nav-version {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.9);
}

.nav-select, .nav-button {
  font-family: inherit;
  font-size: 0.8125rem;
  height: 1.75rem;
  padding: 0 0.5rem;
  border: 1px solid rgba(255,255,255,0.4);
  border-radius: 4px;
  background: rgba(255,255,255,0.15);
  color: white;
  cursor: pointer;
}

.nav-select:hover, .nav-button:hover {
  background: rgba(255,255,255,0.25);
}

.nav-select:focus-visible, .nav-button:focus-visible {
  outline-color: white;
}

.nav-select option {
  color: var(--color-text);
  background: white;
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

#loading {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-light);
}

#loading.hidden {
  display: none;
}

.editor {
  flex: 1;
  display: none;
  grid-template-columns: 1fr 1fr;
  min-height: 0;
}

.editor.ready { display: grid; }

@media (max-width: 1024px) {
  .editor {
    grid-template-columns: 1fr;
    grid-template-rows: minmax(40vh, 1fr) minmax(40vh, 1fr);
    overflow: auto;
  }
}

#monaco-container {
  border-right: 1px solid var(--color-border);
  min-width: 0;
  overflow: hidden;
}

.output-panel {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
  flex-shrink: 0;
}

.tabs button[role="tab"] {
  padding: 0.625rem 1rem;
  border: none;
  background: none;
  font-family: inherit;
  font-size: 0.8125rem;
  color: var(--color-text-light);
  cursor: pointer;
  border-bottom: 2px solid transparent;
}

.tabs button[role="tab"]:hover { color: var(--color-text); }
.tabs button[role="tab"].active {
  color: var(--color-ruby);
  border-bottom-color: var(--color-ruby);
}

.tabs-spacer {
  flex: 1;
}

.tab-action {
  font-family: inherit;
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
  margin-right: 0.375rem;
  border: 1px solid var(--color-border);
  border-radius: 3px;
  background: var(--color-bg);
  color: var(--color-text-light);
  cursor: pointer;
}

.tab-action:hover {
  color: var(--color-text);
  border-color: var(--color-text-light);
}

#output {
  flex: 1;
  overflow: auto;
  background: var(--color-bg-alt);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 13px;
  line-height: 1.5;
  padding: 0.75rem;
}

/* AST tree styles */
.tree-node {
  white-space: pre;
}

.tree-type {
  color: var(--color-ruby);
  font-weight: 600;
  cursor: pointer;
}

.tree-type:hover {
  text-decoration: underline;
}

.tree-loc {
  color: var(--color-text-light);
  cursor: pointer;
}

.tree-loc:hover {
  color: var(--color-ruby);
}

.tree-toggle {
  display: inline-block;
  cursor: pointer;
  user-select: none;
  color: var(--color-text-light);
  background: none;
  border: none;
  padding: 0.125em 0.25em;
  margin-right: 0.125em;
  font: inherit;
  line-height: inherit;
  border-radius: 2px;
}

.tree-toggle:hover {
  color: var(--color-ruby);
  background: var(--color-highlight);
}

.tree-children.collapsed {
  display: none;
}

.tree-field {
  color: var(--color-text-light);
}

.tree-value {
  color: var(--color-text);
}

.tree-string {
  color: #953800;
}

.tree-null {
  color: var(--color-text-light);
  font-style: italic;
}

.tree-connector {
  color: #d1d5db;
}

.tree-flag {
  display: inline-block;
  padding: 0 0.375em;
  border-radius: 3px;
  font-size: 0.85em;
  vertical-align: middle;
  background: rgba(204, 52, 45, 0.08);
  color: var(--color-ruby);
}

.tree-highlight {
  background: var(--color-highlight);
  border-radius: 2px;
}

.prism-highlight {
  background: var(--color-ruby-light) !important;
}

.diagnostics-line {
  padding: 0.25rem 0;
}

.diagnostics-line[data-sl] {
  cursor: pointer;
}

.error-text { color: var(--color-ruby); }
.warning-text { color: #b45309; }

.noscript-message {
  padding: 2rem;
  text-align: center;
  color: var(--color-text-light);
}

.empty-message {
  padding: 0.5rem;
}

.share-toast {
  position: fixed;
  bottom: 1rem;
  left: 50%;
  transform: translateX(-50%);
  padding: 0.5rem 1rem;
  background: var(--color-text);
  color: white;
  border-radius: 4px;
  font-size: 0.8125rem;
  z-index: 100;
  opacity: 0;
  transition: opacity 200ms;
}

.share-toast.visible {
  opacity: 1;
}