:root{--primary: #2563eb;--primary-hover: #1d4ed8;--bg-main: #f8fafc;--panel-bg: #ffffff;--border-color: #e2e8f0;--text-main: #0f172a;--text-muted: #64748b;--danger: #ef4444;--success: #10b981;--warning: #f59e0b;--header-height: 56px;--drawer-width: 280px}*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background-color:var(--bg-main);color:var(--text-main);overflow:hidden;height:100vh;width:100vw;-webkit-user-select:none;user-select:none}#app{display:flex;flex-direction:column;height:100vh;width:100vw}.navbar{height:var(--header-height);background:var(--panel-bg);border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between;padding:0 16px;z-index:20}.nav-brand{display:flex;align-items:center;gap:8px;font-weight:700;font-size:1.15rem;color:var(--text-main)}.brand-badge{background:#dbeafe;color:var(--primary);font-size:.72rem;padding:2px 6px;border-radius:4px}.nav-actions{display:flex;align-items:center;gap:8px}.btn{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;border-radius:6px;font-size:.88rem;font-weight:500;border:1px solid var(--border-color);background:#fff;color:var(--text-main);cursor:pointer;transition:all .15s ease}.btn:active{transform:scale(.97)}.btn-primary{background:var(--primary);border-color:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-hover)}.btn-danger{color:var(--danger);border-color:#fecaca;background:#fef2f2}.btn-icon{padding:8px;border-radius:6px}.main-workspace{flex:1;display:flex;position:relative;overflow:hidden}.component-drawer{width:var(--drawer-width);background:var(--panel-bg);border-right:1px solid var(--border-color);display:flex;flex-direction:column;z-index:15;transition:transform .25s cubic-bezier(.4,0,.2,1)}.drawer-header{padding:12px 16px;border-bottom:1px solid var(--border-color);font-weight:600;font-size:.95rem;display:flex;justify-content:space-between;align-items:center}.category-tabs{display:flex;padding:6px 12px;gap:4px;border-bottom:1px solid var(--border-color);overflow-x:auto;scrollbar-width:none}.category-tabs::-webkit-scrollbar{display:none}.tab-btn{padding:4px 8px;font-size:.8rem;border-radius:4px;border:none;background:none;color:var(--text-muted);cursor:pointer;white-space:nowrap}.tab-btn.active{background:#eff6ff;color:var(--primary);font-weight:600}.component-list{flex:1;overflow-y:auto;padding:12px;display:grid;grid-template-columns:1fr;gap:8px}.comp-card{padding:10px;border:1px solid var(--border-color);border-radius:6px;background:#fafafa;cursor:grab;transition:all .15s ease;display:flex;flex-direction:column;gap:4px}.comp-card:hover{border-color:var(--primary);background:#f0f7ff}.comp-card-name{font-size:.86rem;font-weight:600}.comp-card-desc{font-size:.72rem;color:var(--text-muted);line-height:1.25}.canvas-viewport{flex:1;position:relative;background-color:#f1f5f9;background-image:linear-gradient(to right,#e2e8f0 1px,transparent 1px),linear-gradient(to bottom,#e2e8f0 1px,transparent 1px);background-size:20px 20px;cursor:crosshair;overflow:hidden;touch-action:none}#circuit-svg{width:100%;height:100%;position:absolute;top:0;left:0}.floating-toolbar{position:absolute;bottom:20px;right:20px;display:flex;gap:8px;background:var(--panel-bg);padding:6px;border-radius:8px;box-shadow:0 4px 12px #00000014;border:1px solid var(--border-color);z-index:10}.mobile-bottom-bar{display:none;height:54px;background:var(--panel-bg);border-top:1px solid var(--border-color);padding:0 8px;align-items:center;justify-content:space-around;z-index:18}.bottom-tab-item{display:flex;flex-direction:column;align-items:center;font-size:.7rem;color:var(--text-muted);background:none;border:none;gap:2px}.bottom-tab-item.active{color:var(--primary);font-weight:600}.drawer-backdrop{display:none;position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;z-index:14}.pin-target{cursor:pointer;transition:r .15s ease,stroke .15s ease}.pin-target:hover,.pin-target.connecting{r:9;stroke:#ef4444;fill:#fee2e2}.element-node{cursor:move}.element-node.selected text.element-tag{fill:var(--primary)}.wire-hitarea:hover+path{stroke:#2563eb!important;stroke-width:4!important}@media (max-width: 768px){.component-drawer{position:fixed;top:0;bottom:0;left:0;width:82vw;max-width:320px;transform:translate(-100%);box-shadow:2px 0 12px #00000026}.component-drawer.open{transform:translate(0)}.drawer-backdrop.open{display:block}.mobile-bottom-bar{display:flex}.floating-toolbar{bottom:70px;right:12px;padding:4px;gap:4px}.btn span.btn-text{display:none}}