*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html,body{width:100%;height:100%;overflow:hidden;background:#05050a;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;user-select:none;-webkit-user-select:none}
#canvas{display:block;width:100vw;height:100vh;cursor:crosshair}

/* 浮动图标 */
.panel-toggle{
  position:fixed;top:16px;right:16px;z-index:101;
  width:48px;height:48px;border-radius:14px;
  border:1px solid rgba(255,255,255,0.1);
  background:rgba(12,12,28,0.85);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  color:#fff;font-size:22px;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
  transition:transform 0.25s,background 0.2s;
}
.panel-toggle:hover{background:rgba(28,28,56,0.9);transform:scale(1.05)}
.panel-toggle.hidden{transform:scale(0);opacity:0;pointer-events:none}

/* 面板 */
.panel{
  position:fixed;top:16px;right:16px;width:280px;
  background:rgba(12,12,28,0.85);backdrop-filter:blur(20px) saturate(180%);-webkit-backdrop-filter:blur(20px) saturate(180%);
  border:1px solid rgba(255,255,255,0.08);border-radius:16px;
  color:#e0e0f0;z-index:100;
  transition:transform 0.3s cubic-bezier(0.4,0,0.2,1),opacity 0.3s;
  box-shadow:0 8px 32px rgba(0,0,0,0.5);
  transform-origin:top right;
}
.panel.collapsed{transform:scale(0.6) translateX(120px);opacity:0;pointer-events:none}

.panel-header{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;border-bottom:1px solid rgba(255,255,255,0.06)}
.panel-title{font-size:16px;font-weight:600}
.icon-btn{background:none;border:none;color:#8888aa;font-size:16px;cursor:pointer;padding:4px 8px;border-radius:6px;transition:color 0.2s,background 0.2s}
.icon-btn:hover{color:#fff;background:rgba(255,255,255,0.08)}

.panel-body{padding:14px 18px 18px;max-height:75vh;overflow-y:auto}
.panel-body::-webkit-scrollbar{width:4px}
.panel-body::-webkit-scrollbar-thumb{background:rgba(255,255,255,0.12);border-radius:4px}

.control-group{margin-bottom:14px}
.control-label{display:block;font-size:12px;font-weight:500;color:#9090b0;margin-bottom:8px}

.style-grid{display:grid;grid-template-columns:1fr 1fr;gap:6px}
.style-btn,.color-btn{padding:7px 8px;font-size:12px;border:1px solid rgba(255,255,255,0.08);border-radius:8px;background:rgba(255,255,255,0.03);color:#b0b0c8;cursor:pointer;transition:all 0.15s;text-align:center;white-space:nowrap}
.style-btn:hover,.color-btn:hover{background:rgba(255,255,255,0.07);color:#fff}
.style-btn.active,.color-btn.active{background:linear-gradient(135deg,rgba(120,80,220,0.35),rgba(200,80,180,0.25));border-color:rgba(160,120,240,0.4);color:#fff}

.color-row{display:flex;gap:6px;flex-wrap:wrap}
.color-btn{flex:1;min-width:52px}

.toggle-row{display:flex;align-items:center;gap:10px}
.switch{position:relative;display:inline-block;width:40px;height:22px}
.switch input{opacity:0;width:0;height:0}
.slider{position:absolute;inset:0;background:rgba(255,255,255,0.1);border-radius:22px;transition:0.3s}
.slider::before{content:"";position:absolute;width:16px;height:16px;left:3px;top:3px;background:#ccc;border-radius:50%;transition:0.3s}
.switch input:checked+.slider{background:linear-gradient(135deg,#7850dc,#c850b4)}
.switch input:checked+.slider::before{transform:translateX(18px);background:#fff}
.toggle-text{font-size:13px;color:#b0b0c8}

.range{-webkit-appearance:none;appearance:none;width:100%;height:4px;border-radius:4px;background:rgba(255,255,255,0.1);outline:none}
.range::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:14px;height:14px;border-radius:50%;background:linear-gradient(135deg,#7850dc,#c850b4);cursor:pointer}
.range::-moz-range-thumb{width:14px;height:14px;border-radius:50%;border:none;background:linear-gradient(135deg,#7850dc,#c850b4);cursor:pointer}

.action-row{display:flex;gap:6px;margin-top:4px}
.action-btn{flex:1;padding:9px 6px;font-size:13px;border:1px solid rgba(255,255,255,0.1);border-radius:8px;background:rgba(255,255,255,0.04);color:#c0c0d8;cursor:pointer;transition:all 0.15s}
.action-btn:hover{background:rgba(255,255,255,0.08);color:#fff}
.action-btn.primary{background:linear-gradient(135deg,rgba(120,80,220,0.3),rgba(200,80,180,0.2));border-color:rgba(160,120,240,0.35);color:#fff}

.hint{margin-top:12px;font-size:11px;color:#606080;text-align:center}

.fps{position:fixed;bottom:10px;left:12px;font-size:11px;color:rgba(180,180,220,0.3);font-family:"SF Mono","Menlo",monospace;z-index:100;pointer-events:none}

@media(max-width:600px){.panel{width:calc(100vw - 32px)}}