/* ===== Tokens ===== */
:root {
  --bg: #0b0d10;
  --bg-elev: #12161b;
  --bg-elev-2: #181d24;
  --panel: #0f1318;
  --border: #1f262e;
  --border-strong: #2a323c;
  --text: #e5e9ef;
  --text-dim: #8a94a3;
  --text-faint: #5c6573;
  --accent: #7dd3fc;
  --danger: #f87171;
  --ok: #86efac;

  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --ui: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.theme-light {
  --bg: #f7f8fa;
  --bg-elev: #ffffff;
  --bg-elev-2: #f1f3f7;
  --panel: #ffffff;
  --border: #e4e7ec;
  --border-strong: #cdd3db;
  --text: #1a1f29;
  --text-dim: #5a6573;
  --text-faint: #97a0ad;
  --accent: #0284c7;
}

* { box-sizing: border-box; }

html, body, #root {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--ui);
  font-size: 13px;
  overflow: hidden;
}

button {
  font-family: inherit;
  font-size: 12px;
  background: var(--bg-elev-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 11px;
  cursor: pointer;
  letter-spacing: 0.01em;
  transition: background .12s, border-color .12s, color .12s;
}
button:hover {
  background: var(--bg-elev);
  border-color: var(--border-strong);
}
button.ghost {
  background: transparent;
  color: var(--text-dim);
}

/* ===== App layout ===== */
.app {
  display: grid;
  grid-template-rows: 52px 1fr;
  height: 100vh;
  background: var(--bg);
}

.toolbar {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 24px;
  padding: 0 18px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elev);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}
.brand-mark {
  width: 28px; height: 28px;
  display: grid; place-items: center;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  border-radius: 7px;
}
.brand-title {
  font-weight: 600;
  letter-spacing: -0.01em;
  font-size: 13.5px;
}
.brand-sub {
  font-size: 10.5px;
  color: var(--text-faint);
  letter-spacing: 0.04em;
  text-transform: lowercase;
  margin-top: 1px;
}

.toolbar-actions {
  display: flex;
  gap: 6px;
  justify-self: start;
}

.stats {
  display: flex;
  gap: 18px;
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 11px;
}
.stats b {
  color: var(--text);
  font-weight: 600;
  margin-right: 4px;
}

/* ===== Split ===== */
.split {
  display: flex;
  height: 100%;
  min-height: 0;
}
.pane {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  background: var(--panel);
}
.editor-pane { border-right: 1px solid var(--border); }

.split-handle {
  width: 4px;
  margin: 0 -2px;
  cursor: col-resize;
  position: relative;
  z-index: 5;
  background: transparent;
}
.split-handle::after {
  content: "";
  position: absolute;
  inset: 0 1px;
  background: transparent;
  transition: background .15s;
}
.split-handle:hover::after,
.split-handle[data-dragging="true"]::after {
  background: var(--accent);
  opacity: 0.4;
}

.pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elev);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-dim);
}
.pane-title { letter-spacing: 0.04em; }
.pane-status {
  font-family: var(--mono);
  font-size: 10px;
  padding: 2px 7px;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.pane-status.ok  { background: rgba(134,239,172,0.1); color: var(--ok); }
.pane-status.err { background: rgba(248,113,113,0.12); color: var(--danger); }

.selection-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-left: 12px;
  padding: 3px 4px 3px 8px;
  border-radius: 999px;
  background: color-mix(in oklab, var(--accent) 18%, transparent);
  color: var(--text);
  font-family: var(--mono);
  font-size: 10.5px;
  border: 1px solid color-mix(in oklab, var(--accent) 45%, transparent);
}
.selection-pill .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
}
.selection-pill .x {
  background: transparent;
  border: none;
  color: var(--text-dim);
  padding: 0 4px;
  cursor: pointer;
  font-size: 13px;
  line-height: 1;
  border-radius: 4px;
}
.selection-pill .x:hover { color: var(--text); background: rgba(255,255,255,0.06); }

.legend {
  display: flex;
  gap: 10px;
  font-family: var(--mono);
  font-size: 10px;
  color: var(--text-faint);
}
.legend-item { display: inline-flex; align-items: center; gap: 4px; }
.legend-item .dot {
  width: 7px; height: 7px; border-radius: 2px; display: inline-block;
}

/* ===== Editor ===== */
.editor {
  position: relative;
  flex: 1;
  display: flex;
  min-height: 0;
  background: var(--panel);
}
.gutter {
  flex: 0 0 44px;
  padding: 12px 8px 12px 0;
  text-align: right;
  font-family: var(--mono);
  font-size: 12px;
  line-height: 20px;
  color: var(--text-faint);
  user-select: none;
  overflow: hidden;
  background: var(--panel);
  border-right: 1px solid var(--border);
}
.gutter-line { height: 20px; }

.editor-stack {
  flex: 1;
  position: relative;
  min-width: 0;
}

.highlight-layer {
  position: absolute;
  inset: 0;
  padding: 12px 16px;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 20px;
  white-space: pre;
  tab-size: 2;
  color: transparent;
  overflow: hidden;
  pointer-events: none;
  word-break: normal;
  overflow-wrap: normal;
}
.highlight-layer .hl-mark {
  background: color-mix(in oklab, var(--accent) 28%, transparent);
  box-shadow:
    0 0 0 1px color-mix(in oklab, var(--accent) 55%, transparent),
    0 0 18px color-mix(in oklab, var(--accent) 35%, transparent);
  border-radius: 3px;
  color: transparent;
  padding: 0;
}

.editor-area {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  background: transparent;
  color: var(--text);
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 20px;
  padding: 12px 16px;
  border: none;
  outline: none;
  resize: none;
  white-space: pre;
  tab-size: 2;
  caret-color: var(--accent);
}
.editor-area::selection { background: rgba(125,211,252,0.25); }

.editor-error {
  position: absolute;
  left: 14px;
  bottom: 14px;
  right: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 8px;
  background: rgba(248,113,113,0.08);
  border: 1px solid rgba(248,113,113,0.25);
  color: var(--danger);
  font-family: var(--mono);
  font-size: 11.5px;
}
.editor-error .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--danger);
}

/* ===== Canvas ===== */
.canvas-wrap {
  position: relative;
  flex: 1;
  overflow: hidden;
  cursor: grab;
  background: var(--bg);
}
.canvas-wrap:active { cursor: grabbing; }

.canvas-grid {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
}
.theme-light .canvas-grid {
  background-image:
    radial-gradient(circle, rgba(0,0,0,0.08) 1px, transparent 1px);
}

.canvas-stage {
  position: absolute;
  top: 0; left: 0;
  transform-origin: 0 0;
  will-change: transform;
}

.edges {
  position: absolute;
  pointer-events: none;
  overflow: visible;
}

/* ===== Node card ===== */
.node {
  position: absolute;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 1px 0 rgba(255,255,255,0.02) inset, 0 8px 24px rgba(0,0,0,0.35);
  overflow: hidden;
  transition: border-color .15s, box-shadow .15s;
}
.theme-light .node {
  box-shadow: 0 1px 0 rgba(255,255,255,0.8) inset, 0 6px 18px rgba(20,30,50,0.08);
}
.node[data-edge-hover="true"] {
  border-color: var(--type-color);
}
.node[data-selected="true"] {
  border-color: var(--accent);
  box-shadow:
    0 0 0 1px var(--accent),
    0 0 0 5px color-mix(in oklab, var(--accent) 18%, transparent),
    0 12px 32px rgba(0,0,0,0.55);
}
.theme-light .node[data-selected="true"] {
  box-shadow:
    0 0 0 1px var(--accent),
    0 0 0 5px color-mix(in oklab, var(--accent) 18%, transparent),
    0 8px 24px rgba(20,30,50,0.12);
}

.node-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elev-2);
  height: 38px;
  cursor: pointer;
  user-select: none;
}
.node-header:hover { background: color-mix(in oklab, var(--type-color) 8%, var(--bg-elev-2)); }
.node[data-selected="true"] > .node-header {
  background: color-mix(in oklab, var(--accent) 14%, var(--bg-elev-2));
}
.node-type {
  font-family: var(--mono);
  font-size: 9.5px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 2px 6px;
  border-radius: 3px;
  background: color-mix(in oklab, var(--type-color) 18%, transparent);
  color: var(--type-color);
  border: 1px solid color-mix(in oklab, var(--type-color) 35%, transparent);
}
.node-label {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--text);
  font-weight: 500;
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.node-count {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--text-faint);
}

.node-body {
  padding: 8px 0;
}
.entry {
  display: flex;
  align-items: center;
  gap: 10px;
  height: 28px;
  padding: 0 12px;
  font-family: var(--mono);
  font-size: 11.5px;
  transition: background .12s;
  cursor: pointer;
  user-select: none;
}
.entry:hover { background: var(--bg-elev-2); }
.entry[data-hover="true"] { background: color-mix(in oklab, var(--accent) 12%, transparent); }
.entry[data-selected="true"] {
  background: color-mix(in oklab, var(--accent) 22%, transparent);
  box-shadow: inset 2px 0 0 var(--accent);
}

.entry-key {
  color: var(--text-dim);
  flex: 0 0 auto;
  max-width: 110px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.entry-idx {
  color: var(--text-faint);
  font-style: italic;
}
.entry-val {
  color: var(--type-color);
  margin-left: auto;
  max-width: 150px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-align: right;
}
.entry-ref {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--type-color);
  padding: 1px 7px;
  border-radius: 4px;
  background: color-mix(in oklab, var(--type-color) 12%, transparent);
  cursor: default;
}
.entry-arrow { color: var(--text-faint); font-size: 10px; }

/* ===== Canvas controls ===== */
.canvas-controls {
  position: absolute;
  right: 14px;
  bottom: 14px;
  display: flex;
  gap: 4px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 4px;
  align-items: center;
}
.canvas-controls button {
  width: 28px;
  height: 28px;
  padding: 0;
  background: transparent;
  border: none;
  font-size: 14px;
  color: var(--text-dim);
  border-radius: 5px;
}
.canvas-controls button:hover {
  background: var(--bg-elev-2);
  color: var(--text);
}
.zoom-label {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--text-faint);
  padding: 0 8px;
  border-left: 1px solid var(--border);
  margin-left: 2px;
  height: 18px;
  display: flex;
  align-items: center;
}

/* ===== Minimap ===== */
.minimap {
  position: absolute;
  left: 14px;
  bottom: 14px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px;
  overflow: hidden;
}
.minimap svg { display: block; }

/* Scrollbar tweaks */
.editor-area::-webkit-scrollbar { width: 10px; height: 10px; }
.editor-area::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 6px;
  border: 2px solid var(--panel);
}
.editor-area::-webkit-scrollbar-track { background: transparent; }

/* ===== Pre-mount SEO fallback (replaced by React on load) ===== */
.seo-fallback {
  height: 100%;
  overflow: auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
  max-width: 640px;
  margin: 0 auto;
  padding: 48px 24px;
  background: var(--bg);
  color: var(--text);
}
.seo-fallback h1 {
  font-size: 22px;
  font-weight: 600;
  margin: 0 0 12px;
}
.seo-fallback p {
  color: var(--text-dim);
  line-height: 1.55;
  margin: 0 0 16px;
}
.seo-fallback ul {
  margin: 0 0 20px;
  padding-left: 18px;
  color: var(--text-dim);
  line-height: 1.7;
}
.seo-fallback strong { color: var(--text); }
.seo-fallback-loading { color: var(--text-faint); font-size: 12px; }