:root {
  --bg: #1a1a2e;
  --bg-toolbar: rgba(26,26,46,0.92);
  --text: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --canvas-bg: #16162a;
  --canvas-grid: rgba(255,255,255,0.03);
  --border: rgba(139,92,246,0.12);
  --border-strong: rgba(139,92,246,0.25);
  --primary: #8b5cf6;
  --edge-color: rgba(255,255,255,0.5);
  --node-text: #ffffff;
  --shadow: 0 4px 14px rgba(0,0,0,0.5);
  --radius: 8px;
  --font: 'Inter',-apple-system,sans-serif;
  --transition: 0.2s ease;
}

[data-theme="light"] {
  --bg: #f8fafc;
  --bg-toolbar: rgba(248,250,252,0.92);
  --text: #1e293b;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --canvas-bg: #f1f5f9;
  --canvas-grid: rgba(0,0,0,0.04);
  --border: rgba(139,92,246,0.12);
  --edge-color: rgba(0,0,0,0.4);
  --node-text: #ffffff;
  --shadow: 0 4px 14px rgba(0,0,0,0.08);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:var(--font);background:var(--canvas-bg);overflow:hidden;transition:background var(--transition)}

.toolbar{position:fixed;top:0;left:0;right:0;z-index:100;background:var(--bg-toolbar);backdrop-filter:blur(14px);border-bottom:1px solid var(--border);height:48px;display:flex;align-items:center;justify-content:space-between;padding:0 12px}
.toolbar-left{display:flex;align-items:center;gap:8px}
.toolbar-left h1{font-size:1rem;font-weight:700;color:var(--primary)}
.logo-icon{font-size:1.1rem}
.toolbar-center,.toolbar-right{display:flex;align-items:center;gap:4px}
.separator{width:1px;height:20px;background:var(--border);margin:0 4px}

.tool-btn{display:flex;align-items:center;gap:4px;padding:5px 10px;border:1px solid var(--border);border-radius:var(--radius);background:transparent;color:var(--text-secondary);font-family:var(--font);font-size:0.75rem;font-weight:500;cursor:pointer;transition:all var(--transition);white-space:nowrap}
.tool-btn:hover{background:rgba(139,92,246,0.08);border-color:var(--primary);color:var(--primary)}
.tool-btn:disabled{opacity:0.35;cursor:default}
.tool-btn.active{background:rgba(139,92,246,0.12);color:var(--primary);border-color:var(--primary)}

.map-select{padding:5px 8px;border:1px solid var(--border);border-radius:var(--radius);background:transparent;color:var(--text-secondary);font-family:var(--font);font-size:0.75rem;cursor:pointer;appearance:auto}
.map-select:focus{outline:none;border-color:var(--primary)}

canvas{display:block;cursor:grab;position:absolute;top:48px;left:0}
canvas:active{cursor:grabbing}

/* Context Menu */
.ctx-menu{position:fixed;z-index:200;background:var(--bg-toolbar);backdrop-filter:blur(12px);border:1px solid var(--border-strong);border-radius:var(--radius);padding:4px;box-shadow:var(--shadow);min-width:150px}
.ctx-item{display:flex;align-items:center;gap:6px;width:100%;padding:6px 10px;border:none;border-radius:4px;background:transparent;color:var(--text);font-family:var(--font);font-size:0.78rem;cursor:pointer;transition:background var(--transition)}
.ctx-item:hover{background:rgba(139,92,246,0.12)}

/* Color Picker */
.color-picker{position:fixed;z-index:200;background:var(--bg-toolbar);backdrop-filter:blur(12px);border:1px solid var(--border-strong);border-radius:var(--radius);padding:8px;box-shadow:var(--shadow);display:grid;grid-template-columns:repeat(4,1fr);gap:4px}
.color-swatch{width:28px;height:28px;border-radius:50%;border:2px solid transparent;cursor:pointer;transition:all var(--transition)}
.color-swatch:hover{transform:scale(1.2);border-color:white}

.zoom-indicator{position:fixed;bottom:12px;right:12px;padding:4px 10px;background:var(--bg-toolbar);backdrop-filter:blur(12px);border:1px solid var(--border);border-radius:var(--radius);font-family:var(--font);font-size:0.72rem;color:var(--text-muted);z-index:50}

.toast-container{position:fixed;bottom:12px;left:50%;transform:translateX(-50%);z-index:2000;display:flex;flex-direction:column;gap:6px;align-items:center}
.toast{padding:8px 16px;background:var(--bg-toolbar);border:1px solid var(--border-strong);border-radius:var(--radius);box-shadow:var(--shadow);font-size:0.8rem;color:var(--text);animation:toastIn .3s ease,toastOut .3s ease 2.2s forwards}
@keyframes toastIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
@keyframes toastOut{from{opacity:1}to{opacity:0;transform:translateY(10px)}}

@media(max-width:640px){
  .toolbar{flex-wrap:wrap;height:auto;padding:6px 8px;gap:4px}
  .toolbar-left h1{font-size:0.85rem}
  .tool-btn{padding:4px 6px;font-size:0.7rem}
}