:root {
  --bg: #111318;
  --panel: #1b1f27;
  --panel-2: #202530;
  --text: #f2f5f7;
  --muted: #9aa4b2;
  --accent: #8b5cf6;
  --danger: #ef4444;
  --border: #30384a;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: grid;
  grid-template-columns: 360px 1fr;
  min-height: 100vh;
}
.sidebar {
  border-right: 1px solid var(--border);
  padding: 20px;
  overflow: auto;
  background: #0d1015;
}
h1 { margin: 0 0 8px; font-size: 24px; }
h2 { margin: 0 0 12px; font-size: 16px; }
.muted, .hint { color: var(--muted); font-size: 13px; line-height: 1.5; }
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px;
  margin-top: 16px;
}
label { display: block; font-size: 13px; margin-top: 10px; color: var(--muted); }
input, textarea, button, select {
  width: 100%;
  margin-top: 6px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  padding: 10px 12px;
  font: inherit;
}
textarea { resize: vertical; min-height: 84px; }
button {
  cursor: pointer;
  font-weight: 700;
  margin-top: 10px;
}
button.primary { background: var(--accent); border-color: var(--accent); }
button.danger { background: rgba(239,68,68,.12); border-color: rgba(239,68,68,.45); color: #fecaca; }
.file-label input { padding: 8px 0 0; border: 0; background: transparent; }
.workspace { display: flex; flex-direction: column; min-width: 0; }
.workspace-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
}
.canvas-shell {
  overflow: auto;
  padding: 20px;
  height: calc(100vh - 58px);
}
.canvas-stage {
  display: grid;
  place-items: center;
  margin: 0 auto;
  min-height: 100%;
}
.canvas-container {
  box-shadow: 0 25px 60px rgba(0,0,0,.35);
}
.upper-canvas { outline: 2px solid rgba(139, 92, 246, 0.1); }
@media (max-width: 980px) {
  body { grid-template-columns: 1fr; }
  .sidebar { border-right: 0; border-bottom: 1px solid var(--border); }
  .canvas-shell { height: auto; }
}