:root {
  --bg: #0d1117;
  --bg-elev: #161b22;
  --bg-elev-2: #1f242d;
  --bg-elev-3: #2a313c;
  --fg: #e6edf3;
  --fg-dim: #8b949e;
  --fg-faint: #586069;
  --accent: #00a2e8;
  --accent-fg: #ffffff;
  --green: #3fb950;
  --amber: #d29922;
  --red: #f85149;
  --border: #30363d;
  --user: #58a6ff;
  --string: #a5d6ff;
  --number: #79c0ff;
  --keyword: #ff7b72;
  --key: #d2a8ff;
  --punct: #8b949e;
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
}
body {
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  height: 100vh;
}
.hidden { display: none !important; }

button { font-family: inherit; font-size: inherit; cursor: pointer; }
input, textarea {
  font-family: inherit; font-size: inherit;
  background: var(--bg-elev-2); color: var(--fg);
  border: 1px solid var(--border); border-radius: 6px;
  padding: 8px 10px;
}
input:focus, textarea:focus { outline: none; border-color: var(--accent); }

/* Topbar ------------------------------------------------------------------ */
.topbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 14px;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
}
.brand {
  display: flex; align-items: center; gap: 8px;
  text-decoration: none; color: var(--fg);
  font-weight: 700; font-size: 15px;
}
.brand-mark {
  font-family: ui-monospace, monospace;
  background: var(--accent); color: var(--accent-fg);
  padding: 2px 8px; border-radius: 6px;
  font-weight: 800;
}
.doc-title {
  flex: 1;
  display: flex; align-items: center; gap: 10px;
  max-width: 480px;
}
.doc-title input {
  flex: 1;
  background: transparent; border: 1px solid transparent;
  padding: 6px 10px;
  font-weight: 600;
}
.doc-title input:hover { border-color: var(--border); }
.doc-title input:focus { background: var(--bg-elev-2); border-color: var(--accent); }
.doc-status {
  font-size: 12px; color: var(--fg-dim);
  white-space: nowrap;
}
.topbar-right { display: flex; gap: 8px; align-items: center; }

.btn {
  padding: 7px 14px; border-radius: 6px;
  border: 1px solid var(--border); background: var(--bg-elev-2); color: var(--fg);
  font-weight: 500;
  transition: border-color 0.12s, background 0.12s;
}
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }
.btn.primary:hover { filter: brightness(1.1); }
.btn.ghost { background: transparent; }
.btn.block { width: 100%; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.user-menu { position: relative; }
.popover {
  position: absolute;
  top: calc(100% + 4px); right: 0;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px;
  min-width: 160px;
  display: flex; flex-direction: column;
  z-index: 1000;
}
.popover a {
  padding: 8px 12px;
  color: var(--fg); text-decoration: none;
  border-radius: 4px;
}
.popover a:hover { background: var(--bg-elev-3); }

/* Toolbar ----------------------------------------------------------------- */
.toolbar {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 6px 12px;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  white-space: nowrap;
}
.tb {
  background: transparent; border: 1px solid transparent;
  padding: 6px 10px;
  border-radius: 6px;
  color: var(--fg);
  font-size: 13px;
}
.tb:hover { background: var(--bg-elev-2); border-color: var(--border); }
.tb:disabled { color: var(--fg-faint); cursor: not-allowed; }
.tb:disabled:hover { background: transparent; border-color: transparent; }
.tb.gated { color: var(--fg-dim); position: relative; }
.tb.gated::after {
  content: "";
  position: absolute;
  top: 4px; right: 4px;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--amber);
}
.tb.gated.unlocked { color: var(--fg); }
.tb.gated.unlocked::after { display: none; }
.tb-sep {
  width: 1px; height: 18px;
  background: var(--border);
  margin: 0 6px;
}
.tb-grow { flex: 1; }
.tb-mini {
  background: transparent; color: var(--fg-dim);
  border: none; padding: 2px 6px;
  font-size: 11px;
}
.tb-mini:hover { color: var(--fg); }

/* Workspace --------------------------------------------------------------- */
.workspace {
  display: grid;
  grid-template-columns: 1fr 4px 1fr auto;
  min-height: 0;
  overflow: hidden;
}
.pane {
  display: flex; flex-direction: column;
  min-width: 0;
  background: var(--bg);
  overflow: hidden;
}
.pane-header {
  padding: 8px 12px;
  display: flex; justify-content: space-between; align-items: center;
  background: var(--bg-elev);
  border-bottom: 1px solid var(--border);
  font-size: 12px; color: var(--fg-dim);
  text-transform: uppercase; letter-spacing: 0.04em;
  flex-shrink: 0;
}
.pane-tools { display: flex; gap: 4px; }
.cursor-pos {
  font-family: ui-monospace, monospace;
  font-size: 11px;
  color: var(--fg-dim);
}

.splitter {
  background: var(--border);
  cursor: col-resize;
  transition: background 0.12s;
}
.splitter:hover { background: var(--accent); }

/* Tree view --------------------------------------------------------------- */
.tree-root {
  flex: 1;
  overflow: auto;
  padding: 8px 4px 60px;
  font-family: ui-monospace, "SF Mono", Consolas, monospace;
  font-size: 13px;
  line-height: 1.55;
  white-space: nowrap;
}
.tn { display: block; padding-left: 20px; position: relative; }
.tn-row {
  display: flex;
  align-items: baseline;
  gap: 6px;
  padding: 1px 6px;
  border-radius: 4px;
}
.tn-row:hover { background: var(--bg-elev-2); }
.tn-row.selected { background: var(--bg-elev-3); }
.tn-toggle {
  cursor: pointer;
  width: 12px;
  display: inline-block;
  color: var(--fg-dim);
  user-select: none;
  font-family: monospace;
  font-size: 10px;
}
.tn-toggle.empty { visibility: hidden; }
.tn-key { color: var(--key); }
.tn-string { color: var(--string); }
.tn-number { color: var(--number); }
.tn-keyword { color: var(--keyword); }
.tn-punct { color: var(--punct); }
.tn-summary { color: var(--fg-dim); font-style: italic; padding-left: 4px; }
.tn-children { margin-left: 12px; border-left: 1px solid var(--border); }
.tn-children.collapsed { display: none; }
.tn-actions {
  visibility: hidden;
  display: inline-flex; gap: 2px;
  padding-left: 6px;
}
.tn-row:hover .tn-actions { visibility: visible; }
.tn-act {
  background: transparent; border: none;
  color: var(--fg-dim); cursor: pointer;
  padding: 0 4px; font-size: 11px;
}
.tn-act:hover { color: var(--fg); }

.tn-edit-input {
  background: var(--bg-elev-3);
  border: 1px solid var(--accent);
  color: var(--fg);
  font: inherit;
  padding: 0 4px;
  border-radius: 3px;
  min-width: 60px;
}
.tn-type-select {
  background: var(--bg-elev-3);
  border: 1px solid var(--border);
  color: var(--fg);
  font: inherit;
  border-radius: 3px;
  margin-left: 4px;
}

/* Code view --------------------------------------------------------------- */
.code-root {
  flex: 1;
  min-height: 0;
  overflow: hidden;
  position: relative;
}
.cm-editor {
  height: 100%;
  font-size: 13px;
}
.cm-editor.cm-focused { outline: none; }
.cm-scroller { font-family: ui-monospace, "SF Mono", Consolas, monospace !important; }

/* Problems strip ---------------------------------------------------------- */
.problems {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 12px;
  background: rgba(248, 81, 73, 0.08);
  border-top: 1px solid rgba(248, 81, 73, 0.4);
  flex-shrink: 0;
}
.problems-content {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}
.problems-icon {
  color: var(--red);
  font-size: 16px;
  flex-shrink: 0;
}
.problems-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.problems-loc {
  font-family: ui-monospace, monospace;
  font-size: 12px;
  color: var(--red);
  font-weight: 600;
}
.problems-msg {
  font-size: 13px;
  color: var(--fg-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.fix-btn {
  flex-shrink: 0;
  padding: 6px 12px;
  font-size: 13px;
}
.fix-btn.gated:not(.unlocked) {
  opacity: 0.7;
}

/* Side panel -------------------------------------------------------------- */
.side-panel {
  width: 360px;
  border-left: 1px solid var(--border);
  background: var(--bg-elev);
  display: flex; flex-direction: column;
  overflow: hidden;
}
.side-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
}
.side-tab {
  flex: 1;
  padding: 10px 12px;
  background: transparent;
  border: none;
  color: var(--fg-dim);
  font-size: 13px;
  border-bottom: 2px solid transparent;
}
.side-tab.active { color: var(--fg); border-bottom-color: var(--accent); }
.side-tab:hover:not(.active) { color: var(--fg); }
.side-tab-pane {
  flex: 1;
  overflow: auto;
  padding: 14px;
  display: none;
}
.side-tab-pane.active { display: block; }
.side-empty {
  padding: 16px;
  background: var(--bg-elev-2);
  border-radius: 8px;
  border: 1px solid var(--border);
}
.side-empty p { margin: 8px 0 0; font-size: 13px; color: var(--fg-dim); }
.side-empty code {
  background: var(--bg-elev-3);
  padding: 1px 4px;
  border-radius: 3px;
  font-size: 12px;
}
.muted { color: var(--fg-dim); }
.small { font-size: 12px; }
#ai-instruction { width: 100%; resize: vertical; margin-top: 12px; min-height: 90px; }
.ai-result {
  margin-top: 14px;
  padding: 12px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 8px;
}
.ai-summary { font-weight: 600; margin-bottom: 8px; }
.ai-diff {
  font-family: ui-monospace, monospace;
  font-size: 12px;
  background: var(--bg);
  padding: 8px;
  border-radius: 6px;
  max-height: 280px;
  overflow: auto;
  white-space: pre;
  margin: 0 0 10px;
}
.ai-diff .add { color: var(--green); }
.ai-diff .del { color: var(--red); }
.ai-diff .head { color: var(--fg-dim); }
.ai-actions { display: flex; gap: 8px; }
.ai-error {
  margin-top: 12px;
  padding: 10px;
  background: rgba(248, 81, 73, 0.1);
  color: var(--red);
  border: 1px solid var(--red);
  border-radius: 6px;
  font-size: 13px;
}

.docs-list { display: flex; flex-direction: column; gap: 6px; }
.doc-item {
  padding: 10px 12px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  display: flex; justify-content: space-between; align-items: center;
  gap: 8px;
}
.doc-item:hover { border-color: var(--accent); }
.doc-item.active { border-color: var(--accent); background: var(--bg-elev-3); }
.doc-item-title { font-weight: 600; flex: 1; }
.doc-item-meta { font-size: 11px; color: var(--fg-dim); }
.doc-item-actions { display: flex; gap: 4px; }
.doc-item-actions button {
  background: transparent; border: none;
  color: var(--fg-dim); padding: 2px 6px;
  border-radius: 4px;
}
.doc-item-actions button:hover { color: var(--red); background: var(--bg); }

.schema-output {
  font-family: ui-monospace, monospace;
  font-size: 12px;
  background: var(--bg);
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  max-height: 400px;
  overflow: auto;
  white-space: pre;
  margin: 8px 0;
}

/* Statusbar --------------------------------------------------------------- */
.statusbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--bg-elev);
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--fg-dim);
}
.statusbar .grow { flex: 1; }
.statusbar .dot { color: var(--fg-faint); }
.statusbar .status-path {
  font-family: ui-monospace, monospace;
  color: var(--fg);
  max-width: 50%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
#status-validity.valid { color: var(--green); }
#status-validity.invalid { color: var(--red); }

/* Modal ------------------------------------------------------------------- */
.modal {
  position: fixed; inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex; align-items: center; justify-content: center;
  z-index: 5000;
}
.modal-card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  width: 100%; max-width: 420px;
  position: relative;
}
.modal-card h2 { margin: 0 0 8px; font-size: 18px; }
.modal-card p { margin: 0 0 12px; color: var(--fg-dim); }
.modal-card input { width: 100%; margin-bottom: 12px; }
.modal-close {
  position: absolute; top: 8px; right: 8px;
  background: transparent; border: none;
  color: var(--fg-dim); font-size: 22px;
  width: 32px; height: 32px;
  border-radius: 6px;
}
.modal-close:hover { background: var(--bg-elev-2); color: var(--fg); }
.error {
  background: rgba(248, 81, 73, 0.1);
  color: var(--red);
  border: 1px solid var(--red);
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 13px;
  margin-top: 8px;
}

/* Toast ------------------------------------------------------------------- */
.toast {
  position: fixed;
  bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--bg-elev-3);
  color: var(--fg);
  padding: 10px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  z-index: 6000;
  font-size: 13px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

/* Responsive -------------------------------------------------------------- */
@media (max-width: 900px) {
  .workspace { grid-template-columns: 1fr; grid-template-rows: 1fr 1fr; }
  .splitter { display: none; }
  .pane-tree { border-bottom: 1px solid var(--border); }
  .side-panel { position: fixed; top: 0; right: 0; bottom: 0; width: 90vw; z-index: 4000; }
  .doc-title { max-width: none; }
}