:root {
  --bg: #0f1115;
  --panel: #151920;
  --panel-2: #1b2029;
  --panel-3: #222834;
  --border: #262c37;
  --border-2: #343b48;
  --text: #d7dce5;
  --muted: #7d8797;
  --muted-2: #5a6472;
  --accent: #4f8cff;
  --accent-hover: #3f7ef2;
  --key: #79b8ff;
  --string: #7ee787;
  --number: #ffab70;
  --boolean: #d2a8ff;
  --null: #8b949e;
  --punct: #6b7280;
  --danger: #ff7b72;
  --success: #7ee787;
  --warning: #d29922;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

[data-theme="light"] {
  --bg: #ffffff;
  --panel: #f8f9fb;
  --panel-2: #eef0f4;
  --panel-3: #e4e7ed;
  --border: #e4e7ed;
  --border-2: #d1d5db;
  --text: #1f2328;
  --muted: #656d76;
  --muted-2: #8a919b;
  --accent: #2f6feb;
  --accent-hover: #1f5ad4;
  --key: #0550ae;
  --string: #0a3069;
  --number: #0550ae;
  --boolean: #a40e26;
  --null: #6e7781;
  --punct: #6e7781;
  --danger: #cf222e;
  --success: #1a7f37;
  --warning: #9a6700;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

body.tools-layout {
  overflow: hidden;
}

.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh;
}

.topbar {
  flex: none;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 8px 12px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-right: 8px;
  font-size: 14px;
  font-weight: 600;
  color: #eaeef5;
  white-space: nowrap;
  text-decoration: none;
}
.brand::before {
  content: "{ }";
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: -1px;
  color: var(--accent);
}
[data-theme="light"] .brand { color: #1f2328; }

.tools {
  display: flex;
  flex: 1 1 auto;
  gap: 6px;
  flex-wrap: wrap;
}

.btn {
  appearance: none;
  padding: 6px 11px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--panel-2);
  color: var(--text);
  font: 500 12.5px/1.2 inherit;
  white-space: nowrap;
  cursor: pointer;
  transition: background .15s, border-color .15s, transform .08s;
}
.btn:hover { background: var(--panel-3); border-color: var(--border-2); }
.btn:active { transform: scale(.96); }
.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn.primary:hover { background: var(--accent-hover); }
.btn.danger {
  background: rgba(255, 123, 114, .1);
  border-color: rgba(255, 123, 114, .3);
  color: var(--danger);
}
.btn.danger:hover { background: rgba(255, 123, 114, .2); }

.select {
  appearance: none;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--panel-2);
  color: var(--text);
  font: 12.5px inherit;
  outline: none;
  cursor: pointer;
}
.select:focus { border-color: var(--accent); }

.workspace {
  display: flex;
  flex: 1;
  min-height: 0;
}
.pane {
  display: flex;
  flex: 1 1 50%;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
}
.pane + .pane { border-left: 1px solid var(--border); }

.pane-head {
  flex: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  min-height: 36px;
  padding: 5px 12px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  color: var(--muted);
}
.head-actions { display: flex; gap: 5px; }
.hint { font-size: 11px; color: var(--muted-2); }

.mini {
  appearance: none;
  padding: 3px 8px;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: transparent;
  color: var(--muted);
  font: 11.5px inherit;
  cursor: pointer;
  transition: .15s;
}
.mini:hover {
  background: var(--panel-2);
  border-color: var(--border-2);
  color: var(--text);
}
.mini.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.pane-body {
  position: relative;
  flex: 1;
  min-height: 0;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
}

#input, .textarea {
  display: block;
  width: 100%;
  height: 100%;
  padding: 12px;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
  font: 13px/1.65 var(--mono);
  tab-size: 2;
  resize: none;
}
#input::placeholder, .textarea::placeholder { color: var(--muted-2); }

.code {
  min-height: 100%;
  margin: 0;
  padding: 12px;
  font: 13px/1.65 var(--mono);
  white-space: pre;
  tab-size: 4;
}
.code.plain { color: var(--text); word-break: break-all; white-space: pre-wrap; }

.tok-key     { color: var(--key); }
.tok-string  { color: var(--string); }
.tok-number  { color: var(--number); }
.tok-boolean { color: var(--boolean); }
.tok-null    { color: var(--null); font-style: italic; }
.tok-bracket,
.tok-punct   { color: var(--punct); }

.fold {
  display: inline-block;
  width: 14px;
  height: 14px;
  margin: 0 3px;
  border-radius: 3px;
  background: var(--panel-3);
  color: var(--muted);
  font-size: 11px;
  line-height: 14px;
  text-align: center;
  vertical-align: 1px;
  cursor: pointer;
  user-select: none;
  transition: background .12s;
}
.fold:hover { background: var(--accent); color: #fff; }
.node.collapsed > .children { display: none; }

.err-title { margin-bottom: 6px; color: var(--danger); font-weight: 600; }
.err-msg   { margin-bottom: 8px; color: var(--danger); white-space: pre-wrap; word-break: break-all; }
.err-loc   { margin-bottom: 10px; font-size: 12px; color: var(--muted); }
.err-code {
  margin: 0;
  padding: 10px;
  overflow: auto;
  border: 1px solid var(--danger);
  border-radius: 8px;
  background: rgba(255, 123, 114, .08);
  font: 12.5px/1.6 var(--mono);
  white-space: pre;
}
.err-code .ln { color: var(--muted-2); user-select: none; }
.err-code .ln.bad { color: var(--danger); font-weight: 600; }
.caret { color: var(--danger); font-weight: 700; }

.statusbar {
  flex: none;
  display: flex;
  align-items: center;
  min-height: 30px;
  padding: 4px 14px;
  background: var(--panel);
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--muted);
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  gap: 16px;
}
#status.ok  { color: var(--success); }
#status.err { color: var(--danger); }

.toast {
  position: fixed;
  left: 50%;
  bottom: 64px;
  z-index: 99;
  padding: 9px 18px;
  border-radius: 999px;
  background: var(--panel-3);
  color: #fff;
  font-size: 13px;
  white-space: nowrap;
  box-shadow: 0 6px 22px rgba(0, 0, 0, .45);
  opacity: 0;
  transform: translate(-50%, 10px);
  pointer-events: none;
  transition: opacity .22s, transform .22s;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

.nav-back {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--panel-2);
  color: var(--text);
  font-size: 12px;
  text-decoration: none;
  margin-right: 8px;
  transition: .15s;
}
.nav-back:hover { background: var(--panel-3); border-color: var(--border-2); }

.theme-toggle {
  margin-left: auto;
  display: flex;
  gap: 2px;
  padding: 2px;
  border-radius: 6px;
  background: var(--panel-2);
  border: 1px solid var(--border);
}
.theme-toggle button {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 14px;
  padding: 3px 6px;
  border-radius: 4px;
  cursor: pointer;
  transition: .15s;
}
.theme-toggle button.active { background: var(--accent); color: #fff; }

.tab-bar {
  display: flex;
  gap: 2px;
  padding: 2px;
  background: var(--panel-2);
  border-radius: 7px;
  border: 1px solid var(--border);
}
.tab-bar .tab {
  appearance: none;
  padding: 4px 10px;
  border: none;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 12px;
  border-radius: 5px;
  cursor: pointer;
  transition: .15s;
}
.tab-bar .tab.active { background: var(--accent); color: #fff; }
.tab-bar .tab:hover:not(.active) { color: var(--text); }

.options-bar {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  padding: 6px 12px;
  background: var(--panel);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  font-size: 12px;
}
.options-bar label {
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--muted);
}

.stats-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--panel-2);
  font-size: 11px;
  color: var(--muted);
}

@media (max-width: 760px) {
  .workspace { flex-direction: column; }
  .pane + .pane { border-top: 1px solid var(--border); border-left: 0; }
  .hint { display: none; }
  .brand { font-size: 13px; margin-right: 4px; }
  .btn { padding: 5px 9px; font-size: 12px; }
  #input, .code, .textarea { font-size: 12.5px; }
  .theme-toggle { margin-left: 0; }
}