:root {
  --bg: #0f1115;
  --bg-2: #161922;
  --panel: #1b1f2a;
  --border: #2a2f3c;
  --text: #e6e9ef;
  --muted: #8b93a7;
  --accent: #4ea1ff;
  --green: #46c98b;
  --red: #ff6b6b;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans), sans-serif;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-2);
}
.brand { margin: 0; font-family: var(--mono), monospace; font-weight: 700; font-size: 18px; color: var(--accent); }

/* Visible to screen readers and crawlers, hidden visually. */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}
.tagline { color: var(--muted); font-size: 13px; }
.net-indicator {
  position: relative;
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-family: var(--mono), monospace;
  color: var(--green);
  cursor: pointer;
  user-select: none;
}
.net-indicator .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--green);
}
.net-indicator.dirty { color: var(--red); }
.net-indicator.dirty .dot { background: var(--red); }
.net-info-cue { color: var(--muted); font-size: 11px; }
.net-indicator:hover .net-info-cue { color: var(--text); }

.net-info {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 300px;
  padding: 12px 14px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  z-index: 20;
  font-family: var(--sans), sans-serif;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--text);
  cursor: auto;
}
.net-info strong { color: var(--text); }
.net-info p { margin: 8px 0 0; color: var(--muted); }
.net-info code {
  font-family: var(--mono), monospace;
  font-size: 11px;
  background: var(--bg-2);
  padding: 1px 4px;
  border-radius: 4px;
}
.net-info a { color: var(--accent); }
.net-info-note { font-size: 11.5px; opacity: 0.85; }
.src-link { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.src-link:hover { color: var(--text); }

.layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  height: calc(100vh - 49px);
  background: var(--border);
}
@media (max-width: 760px) {
  .layout { grid-template-columns: 1fr; grid-template-rows: 1fr 1fr; }
}

.pane {
  display: flex;
  flex-direction: column;
  background: var(--bg);
  min-width: 0;
  min-height: 0;
}
.pane-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}
.pane-title { font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; }
.actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }

/* Search box in the output pane head */
.search-box { display: flex; align-items: center; gap: 6px; }
.search {
  font-family: var(--sans), sans-serif;
  font-size: 13px;
  color: var(--text);
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 9px;
  width: 140px;
}
.search:focus { outline: none; border-color: var(--accent); }
.search-count { font-family: var(--mono), monospace; font-size: 12px; color: var(--muted); min-width: 1ch; }

/* Search hit highlighting in the text output */
mark.hit {
  background: rgba(255, 180, 84, 0.25);
  color: var(--text);
  border-radius: 2px;
}
mark.hit.active {
  background: var(--accent);
  color: #06101f;
}

button, select {
  font-family: var(--sans), sans-serif;
  font-size: 13px;
  color: var(--text);
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 10px;
  cursor: pointer;
}
button:hover { border-color: var(--accent); }
button.primary { background: var(--accent); color: #06101f; border-color: var(--accent); font-weight: 600; }
.indent { font-size: 12px; color: var(--muted); display: flex; align-items: center; gap: 5px; }

.view-toggle { display: inline-flex; border: 1px solid var(--border); border-radius: 6px; overflow: hidden; }
.view-toggle button { border: 0; border-radius: 0; background: var(--bg-2); }
.view-toggle button.active { background: var(--accent); color: #06101f; }

.editor {
  flex: 1;
  width: 100%;
  margin: 0;
  border: 0;
  resize: none;
  padding: 12px;
  background: var(--bg);
  color: var(--text);
  font-family: var(--mono), monospace;
  font-size: 13px;
  line-height: 1.55;
  tab-size: 2;
  overflow: auto;
  white-space: pre;
}

/* Input box with a line-number gutter. Gutter font/line-height/padding must
   match the textarea exactly so numbers line up with their rows. */
.editor-wrap { flex: 1; display: flex; min-height: 0; }
.editor-wrap .editor { width: auto; min-width: 0; }
.gutter {
  flex: 0 0 auto;
  min-width: 2.5ch;
  padding: 12px 8px 12px 12px;
  margin: 0;
  text-align: right;
  font-family: var(--mono), monospace;
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
  background: var(--bg-2);
  border-right: 1px solid var(--border);
  overflow: hidden;
  white-space: pre;
  user-select: none;
}
.gutter .err-line { color: var(--red); font-weight: 700; }
.editor:focus { outline: none; }
.editor.dragover {
  outline: 2px dashed var(--accent);
  outline-offset: -4px;
  background: rgba(78, 161, 255, 0.06);
}
.output { white-space: pre; }

.status {
  padding: 7px 12px;
  font-family: var(--mono), monospace;
  font-size: 12px;
  border-top: 1px solid var(--border);
  background: var(--panel);
  min-height: 30px;
  color: var(--muted);
}
.status.ok { color: var(--green); }
.status.err { color: var(--red); }

.tree {
  flex: 1;
  overflow: auto;
  padding: 10px 12px;
  font-family: var(--mono), monospace;
  font-size: 13px;
  line-height: 1.5;
}
.hidden { display: none; }

.tnode { padding-left: 14px; }
.tchildren { padding-left: 0; }
.tkey { color: var(--accent); }
.tstr { color: var(--green); }
.tnum { color: #d3a0ff; }
.tbool { color: #ffb454; }
.tnull { color: var(--muted); }
.tcollapse {
  display: inline-block;
  width: 1em;
  margin-left: -14px;
  margin-right: 2px;
  text-align: center;
  user-select: none;
  color: var(--muted);
}
.tmeta { color: var(--muted); }

/* Header line of a foldable node: hover-highlight and click anywhere to fold. */
.tline { cursor: default; border-radius: 4px; }
.tnode > .tline:has(.tcollapse) { cursor: pointer; }
.tnode > .tline:has(.tcollapse):hover { background: var(--bg-2); }
.tnode > .tline:has(.tcollapse):hover .tcollapse { color: var(--text); }

/* Collapsed state: hide children, show the inline " … }" preview. */
.tsummary { display: none; }
.tnode.collapsed > .tchildren { display: none; }
.tnode.collapsed > .tline > .tsummary { display: inline; }