:root {
  --bg-color: #0f172a;
  --panel-bg: #1e293b;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --border: #334155;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--font-sans); background-color: var(--bg-color); color: var(--text-main); display: flex; flex-direction: column; min-height: 100vh; }
.app-header { background: var(--panel-bg); border-bottom: 1px solid var(--border); padding: 1rem 2rem; display: flex; justify-content: space-between; align-items: center; }
.brand h1 { font-size: 1.25rem; font-weight: 700; }
.badge { font-size: 0.75rem; background: var(--accent); padding: 0.125rem 0.5rem; border-radius: 9999px; }
.nav-rail { display: flex; gap: 0.5rem; }
.nav-btn, .tool-btn, .btn { background: var(--border); color: var(--text-main); border: none; padding: 0.5rem 1rem; border-radius: 0.375rem; cursor: pointer; font-size: 0.875rem; font-weight: 500; transition: background 0.2s; }
.nav-btn:hover, .tool-btn:hover, .btn:hover { background: #475569; }
.nav-btn.active, .tool-btn.active { background: var(--accent); }
.app-main { flex: 1; padding: 2rem; max-width: 1400px; margin: 0 auto; width: 100%; }
.view-panel { display: none; }
.view-panel.active { display: block; }
.workspace-grid { display: grid; grid-template-columns: 320px 1fr; gap: 2rem; }
.control-panel, .canvas-workspace, .assistant-box, .table-container, .docs-content { background: var(--panel-bg); border: 1px solid var(--border); border-radius: 0.5rem; padding: 1.5rem; }
.control-panel h2, .view-panel h2 { font-size: 1.125rem; margin-bottom: 1rem; }
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; font-size: 0.8125rem; color: var(--text-muted); margin-bottom: 0.375rem; }
.form-group select, .form-group input[type="number"] { width: 100%; padding: 0.5rem; background: var(--bg-color); border: 1px solid var(--border); color: var(--text-main); border-radius: 0.375rem; }
.actions { display: flex; flex-direction: column; gap: 0.5rem; margin-top: 1.5rem; }
.btn.primary { background: var(--accent); }
.btn.primary:hover { background: var(--accent-hover); }
.canvas-workspace { display: flex; flex-direction: column; align-items: center; gap: 1rem; }
.toolbar { display: flex; gap: 0.5rem; width: 100%; }
.canvas-container { background: #000; border: 1px solid var(--border); border-radius: 0.375rem; overflow: auto; max-width: 100%; display: flex; justify-content: center; align-items: center; padding: 1rem; }
canvas { image-rendering: pixelated; max-width: 100%; height: auto; }
table { width: 100%; border-collapse: collapse; margin-top: 1rem; }
th, td { padding: 0.75rem; text-align: left; border-bottom: 1px solid var(--border); font-size: 0.875rem; }
th { color: var(--text-muted); }
.app-footer { background: var(--panel-bg); border-top: 1px solid var(--border); padding: 1rem; text-align: center; font-size: 0.75rem; color: var(--text-muted); }
@media(max-width: 768px) { .workspace-grid { grid-template-columns: 1fr; } .app-header { flex-direction: column; gap: 1rem; } }