:root {
  --bg: #0f172a;
  --bg-sidebar: #1e293b;
  --bg-card: #1e293b;
  --bg-canvas: #0c1220;
  --text: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --primary: #3b82f6;
  --primary-light: #60a5fa;
  --border: rgba(59,130,246,0.1);
  --border-strong: rgba(59,130,246,0.25);
  --shadow: 0 4px 14px rgba(0,0,0,0.4);
  --radius: 8px;
  --font: 'Inter',-apple-system,sans-serif;
  --mono: 'JetBrains Mono',monospace;
  --transition: 0.2s ease;
  --glass: rgba(30,41,59,0.9);
  --grid: rgba(59,130,246,0.04);
  --node-w: 120;
  --node-h: 70;
}
[data-theme="light"]{
  --bg: #f8fafc;--bg-sidebar:#ffffff;--bg-card:#ffffff;--bg-canvas:#f1f5f9;
  --text:#1e293b;--text-secondary:#475569;--text-muted:#64748b;
  --border:rgba(59,130,246,0.12);--shadow:0 4px 14px rgba(0,0,0,0.06);
  --glass:rgba(255,255,255,0.9);--grid:rgba(59,130,246,0.06);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:var(--font);background:var(--bg);color:var(--text);overflow:hidden;min-height:100vh;transition:background var(--transition)}

.toolbar{position:fixed;top:0;left:0;right:0;z-index:100;height:46px;background:var(--glass);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 12px}
.toolbar-left,.toolbar-center,.toolbar-right{display:flex;align-items:center;gap:4px}
.toolbar-left h1{font-size:1rem;font-weight:700;color:var(--primary);margin-left:6px}
.separator{width:1px;height:18px;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(59,130,246,0.06);border-color:var(--primary);color:var(--primary)}
.tool-btn.active{background:rgba(59,130,246,0.1);color:var(--primary);border-color:var(--primary)}

.app-layout{display:flex;height:calc(100vh - 46px);margin-top:46px}
.palette{width:170px;background:var(--bg-sidebar);border-right:1px solid var(--border);padding:12px;overflow-y:auto;flex-shrink:0}
.palette-title{font-size:0.68rem;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);margin-bottom:8px}
.palette-list{display:flex;flex-direction:column;gap:4px}
.pal-item{display:flex;align-items:center;gap:6px;padding:8px 10px;border:1px solid var(--border);border-radius:var(--radius);background:transparent;color:var(--text-secondary);font-family:var(--font);font-size:0.78rem;cursor:pointer;transition:all var(--transition);text-align:left}
.pal-item:hover{background:rgba(59,130,246,0.06);border-color:var(--primary);color:var(--primary)}
.zone-item{font-size:0.72rem}

.canvas-wrap{flex:1;position:relative;overflow:hidden}
canvas{display:block;cursor:grab;position:absolute;top:0;left:0}
canvas:active{cursor:grabbing}

.ctx-menu{position:fixed;z-index:200;background:var(--glass);backdrop-filter:blur(12px);border:1px solid var(--border-strong);border-radius:var(--radius);padding:4px;box-shadow:var(--shadow);min-width:140px}
.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(59,130,246,0.1)}

.tier-picker{position:fixed;z-index:200;background:var(--glass);backdrop-filter:blur(12px);border:1px solid var(--border-strong);border-radius:var(--radius);padding:6px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:4px}
.tier-swatch{padding:6px 12px;border:none;border-radius:4px;color:#fff;font-family:var(--font);font-size:0.75rem;font-weight:500;cursor:pointer;transition:opacity var(--transition)}
.tier-swatch:hover{opacity:0.85}

.zoom-info{position:fixed;bottom:10px;right:10px;padding:3px 8px;background:var(--glass);border:1px solid var(--border);border-radius:var(--radius);font-size:0.7rem;color:var(--text-muted);z-index:50;font-family:var(--mono)}

.toast-container{position:fixed;bottom:10px;left:50%;transform:translateX(-50%);z-index:2000;display:flex;flex-direction:column;gap:6px;align-items:center}
.toast{padding:8px 14px;background:var(--glass);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(8px)}to{opacity:1;transform:translateY(0)}}
@keyframes toastOut{from{opacity:1}to{opacity:0;transform:translateY(8px)}}

@media(max-width:640px){.palette{display:none}.app-layout{flex-direction:column}}