:root {
  --bg: #16181d;
  --bg-panel: #1d2026;
  --bg-toolbar: #22262e;
  --border: #2e333d;
  --text: #d7dae0;
  --text-dim: #8a90a0;
  --accent: #4f8ef7;
  --accent-2: #2563eb;
  --error: #f87171;
  --ok: #4ade80;
  --table-bg: #232730;
  --table-row-alt: #262b35;
  --edge: #5b6372;
  --edge-hi: #4f8ef7;
  font-size: 14px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  overflow: hidden;
}

/* ---------- Toolbar ---------- */
#toolbar {
  display: flex;
  align-items: center;
  gap: 18px;
  height: 46px;
  padding: 0 14px;
  background: var(--bg-toolbar);
  border-bottom: 1px solid var(--border);
}

.brand {
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.4px;
  color: var(--accent);
}
.brand span { color: var(--text); font-weight: 400; }

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 6px;
}
.toolbar-group:nth-of-type(2) { flex: 1; justify-content: center; }

#toolbar button {
  background: #2b303a;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 11px;
  font-size: 12.5px;
  cursor: pointer;
  transition: background 0.15s;
}
#toolbar button:hover { background: #353b47; }

#zoom-level {
  min-width: 44px;
  text-align: center;
  color: var(--text-dim);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

#search {
  width: 280px;
  background: #14161b;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 6px 10px;
  font-size: 13px;
  outline: none;
}
#search:focus { border-color: var(--accent); }

/* ---------- Layout ---------- */
#app {
  display: flex;
  height: calc(100% - 46px);
}

#editor-pane {
  width: 340px;
  min-width: 200px;
  max-width: 60vw;
  display: flex;
  flex-direction: column;
  background: var(--bg-panel);
  border-right: 1px solid var(--border);
}

.pane-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 12px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-dim);
  border-bottom: 1px solid var(--border);
}

.status { font-size: 12px; }
.status.ok { color: var(--ok); }
.status.err { color: var(--error); }

#editor {
  flex: 1;
  width: 100%;
  resize: none;
  border: none;
  outline: none;
  background: var(--bg-panel);
  color: var(--text);
  font-family: "SF Mono", Menlo, Monaco, "Courier New", monospace;
  font-size: 12.5px;
  line-height: 1.55;
  padding: 12px;
  tab-size: 2;
}

#errors {
  max-height: 140px;
  overflow-y: auto;
  font-family: "SF Mono", Menlo, monospace;
  font-size: 11.5px;
  color: var(--error);
  border-top: 1px solid var(--border);
}
#errors:empty { display: none; }
#errors div { padding: 4px 12px; border-bottom: 1px solid #2a2025; }

#splitter {
  width: 5px;
  cursor: col-resize;
  background: transparent;
  flex-shrink: 0;
}
#splitter:hover { background: var(--accent-2); }

#diagram-pane {
  position: relative;
  flex: 1;
  overflow: hidden;
}

#diagram {
  position: absolute;
  inset: 0;
}

#diagram svg {
  width: 100%;
  height: 100%;
  display: block;
  background:
    radial-gradient(circle, #2a2e38 1px, transparent 1px) 0 0 / 24px 24px,
    var(--bg);
}

#hint {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 11.5px;
  color: var(--text-dim);
  background: rgba(29, 32, 38, 0.85);
  padding: 5px 14px;
  border-radius: 14px;
  pointer-events: none;
  white-space: nowrap;
}

/* ---------- Focus banner ---------- */
#focus-banner {
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 12px;
  background: #1c2433;
  border: 1px solid var(--accent-2);
  border-radius: 8px;
  padding: 7px 14px;
  font-size: 13px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
}
#focus-banner.hidden { display: none; }
#focus-banner b { color: var(--accent); }
#btn-clear-focus {
  background: var(--accent-2);
  border: none;
  color: #fff;
  border-radius: 5px;
  padding: 4px 11px;
  font-size: 12px;
  cursor: pointer;
}
#btn-clear-focus:hover { background: var(--accent); }

/* ---------- LOD (level-of-detail) tables ---------- */
.tbl-mini { stroke: rgba(0,0,0,0.35); stroke-width: 1; }

/* ---------- Tools / Explore panel ---------- */
#tools-panel {
  width: 300px;
  min-width: 300px;
  background: var(--bg-panel);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}
#tools-panel.collapsed { display: none; }

.tp-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--text-dim);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg-panel);
  z-index: 2;
}
#tp-close {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  padding: 0 4px;
}
#tp-close:hover { color: var(--error); }

.tp-section {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
}
.tp-title {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.4px;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 8px;
}
.tp-dim { color: var(--text-dim); font-weight: 400; }

#tools-panel input[type="text"],
#tools-panel select {
  width: 100%;
  background: #14161b;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 6px 9px;
  font-size: 12.5px;
  outline: none;
  margin-bottom: 6px;
}
#tools-panel input[type="text"]:focus,
#tools-panel select:focus { border-color: var(--accent); }

.tp-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}
.tp-row select { margin-bottom: 0; flex: 1; }
.tp-row input[type="range"] { flex: 1; }
.tp-label { font-size: 12px; color: var(--text-dim); white-space: nowrap; }
.tp-label b { color: var(--text); font-variant-numeric: tabular-nums; }

.tp-check {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text);
  cursor: pointer;
  margin-bottom: 6px;
}
.tp-backbone-row { opacity: 0.5; }
.tp-backbone-row.active { opacity: 1; }

#tools-panel button {
  background: #2b303a;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 10px;
  font-size: 12px;
  cursor: pointer;
  transition: background 0.15s;
}
#tools-panel button:hover { background: #353b47; }
.tp-row button { flex: 1; }
.tp-primary {
  width: 100%;
  background: var(--accent-2) !important;
  border-color: #3474e8 !important;
  color: #fff;
  margin-top: 2px;
}
.tp-primary:hover { background: var(--accent) !important; }

.tp-list {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  max-height: 260px;
  overflow-y: auto;
}
.tp-list li {
  padding: 6px 8px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 12.5px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.tp-list li:hover { background: var(--table-row-alt); }

.tp-kind {
  font-size: 9.5px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: #fff;
  background: #3a4150;
  border-radius: 3px;
  padding: 1px 5px;
  flex-shrink: 0;
}
.tp-kind.table { background: #2f6feb; }
.tp-kind.column { background: #1f883d; }
.tp-kind.note { background: #8957e5; }
.tp-kind.enum { background: #bf8700; }
.tp-kind.relationship { background: #cf222e; }
.tp-kind.group { background: #57606a; }

.tp-res-main { overflow: hidden; }
.tp-res-label {
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.tp-res-sub {
  color: var(--text-dim);
  font-size: 11px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tp-group-item {
  justify-content: space-between;
}
.tp-group-left {
  display: flex;
  align-items: center;
  gap: 8px;
  overflow: hidden;
}
.tp-group-swatch {
  width: 11px;
  height: 11px;
  border-radius: 3px;
  flex-shrink: 0;
}
.tp-group-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.tp-group-count { color: var(--text-dim); font-size: 11px; font-variant-numeric: tabular-nums; }
.tp-group-item.hidden-group { opacity: 0.45; }
.tp-group-toggle {
  padding: 1px 6px !important;
  font-size: 11px !important;
}

.tp-msg { font-size: 12px; margin-top: 6px; min-height: 16px; }
.tp-msg.ok { color: var(--ok); }
.tp-msg.err { color: var(--error); }

@media (max-width: 900px) {
  #tools-panel { width: 240px; min-width: 240px; }
}