:root {
  --bg: #222;
  --panel: #111;
  --panel-2: #00000050;
  --text: #ccc;
  --muted: #8a93a1;
  --border: #333;
  --grid: rgba(255, 255, 255, 0.1);
  --grid-strong: rgba(255, 255, 255, 0.2);
  --axis: rgba(255, 59, 59, 0.9);
  --graph: #ff2b2b;
  --graph-soft: rgba(255, 43, 43, 0.22);
  --danger: #ff6969;
  --radius: 8px;
  --sidebar-width: 400px;
  --font: Inter, "Segoe UI", system-ui, sans-serif;
}

@font-face {
  font-family: Inter;
  src: url("/res/fonts/Inter.ttf");
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
}

button, input { font: inherit; }

.app {
  min-height: 100%;
  padding: 12px;
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 12px;
}

.topbar,
.panel,
.graph-shell,
.item-row {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.topbar {
  padding: 12px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.topbar h1,
.panel-head h2,
.graph-head h2 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.btn {
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  border-radius: 4px;
  padding: 8px 12px;
  cursor: pointer;
  transition: border-color 0.14s ease, background 0.1s ease, transform 0.08s ease;
}

.btn:hover { background-color: #333; }
.btn:active { transform: translateY(1px); }
.btn.delete-btn { color: var(--danger); }
.btn.delete-btn:hover { background-color: #8b000050; }

.layout {
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(300px, var(--sidebar-width)) 1fr;
  gap: 12px;
}

.sidebar {
  min-height: 0;
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 12px;
}

.panel {
  min-height: 0;
  display: grid;
  grid-template-rows: auto 1fr auto;
  overflow: hidden;
}

.panel:hover {
  border-color: #ff000080;
}

.panel-grow { min-height: 0; }

.panel-head,
.graph-head {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.list {
  min-height: 0;
  padding: 12px;
  overflow: auto;
  display: grid;
  gap: 10px;
  align-content: start;
}

.panel-footer {
  padding: 0 12px 12px;
}

.item-row {
  padding: 10px;
  display: grid;
  gap: 10px;
}

.row-top {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
}

.param-top {
  grid-template-columns: 0.65fr 1fr auto;
}

.expr-input,
.param-name,
.param-value {
  min-width: 0;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  border-radius: 8px;
  padding: 10px 11px;
  outline: none;
}

.expr-input:focus,
.param-name:focus,
.param-value:focus {
  border-color: #435065;
}

.row-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.preview,
.muted,
.visible-toggle {
  color: var(--muted);
  font-size: 13px;
}

.preview-value,
.param-result {
  color: var(--graph);
  font-weight: 600;
}

.visible-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  user-select: none;
}

.visible-toggle input {
  accent-color: var(--graph);
}

.graph-shell {
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  display: grid;
  grid-template-rows: auto 1fr;
}

#graph {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--panel-2);
  cursor: crosshair;
}

#graph.dragging { cursor: grabbing; }

.readout {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
  flex-wrap: wrap;
}

.readout strong {
  color: var(--text);
  font-weight: 600;
}

@media (max-width: 980px) {
  .layout { grid-template-columns: 1fr; }
  .topbar { align-items: flex-start; flex-direction: column; }
}