.bf-canvas{--bf-primary: #6366f1;--bf-primary-hover: #818cf8;--bf-primary-bg: rgba(99, 102, 241, .06);--bf-accent: #f472b6;--bf-surface: #ffffff;--bf-surface-2: #f8fafc;--bf-text: #0f172a;--bf-text-secondary: #64748b;--bf-border: #e2e8f0;--bf-border-focus: #6366f1;--bf-error: #ef4444;--bf-success: #22c55e;--bf-radius: 8px;--bf-radius-sm: 4px;--bf-radius-lg: 12px;--bf-shadow-sm: 0 1px 2px rgba(0,0,0,.05);--bf-shadow-md: 0 4px 12px rgba(0,0,0,.1);--bf-shadow-lg: 0 12px 32px rgba(0,0,0,.12);--bf-transition: .15s ease;--bf-font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;font-family:var(--bf-font);color:var(--bf-text);position:relative;min-height:200px}.bf-canvas-editing{cursor:default}.bf-block-wrapper{position:relative;border:2px solid transparent;border-radius:var(--bf-radius);transition:border-color var(--bf-transition),box-shadow var(--bf-transition),background-color var(--bf-transition);margin:0}.bf-block-editable{cursor:pointer}.bf-block-hovered{border-color:#6366f14d;background:var(--bf-primary-bg)}.bf-block-selected{border-color:var(--bf-primary);box-shadow:0 0 0 3px #6366f126;background:#6366f105}.bf-block-dragging{border-color:var(--bf-primary);border-style:dashed;background:#6366f10a;transition:transform 0ms!important;will-change:transform}.bf-block-drop-target{border-color:var(--bf-accent);background:#f472b60a}.bf-drop-indicator{position:absolute;top:-3px;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--bf-primary),var(--bf-accent));border-radius:2px;z-index:20;animation:bf-fade-in 80ms ease}.bf-block-sidebar{position:absolute;left:-44px;top:50%;transform:translateY(-50%);display:flex;flex-direction:column;align-items:center;gap:4px;z-index:10;animation:bf-fade-in .1s ease}.bf-block-sidebar-handle{display:flex;align-items:center;justify-content:center;width:28px;height:36px;cursor:grab;color:#94a3b8;border-radius:4px;transition:all var(--bf-transition);touch-action:none;-webkit-user-select:none;user-select:none}.bf-block-sidebar-handle:hover{background:var(--bf-primary-bg);color:var(--bf-primary)}.bf-block-sidebar-handle:active{cursor:grabbing}.bf-block-sidebar-label{font-size:10px;font-weight:600;color:var(--bf-primary);white-space:nowrap;letter-spacing:.3px;writing-mode:vertical-lr;transform:rotate(180deg);max-height:80px;overflow:hidden;text-overflow:ellipsis}.bf-block-actions{position:absolute;top:-40px;right:8px;display:flex;gap:2px;background:var(--bf-surface);border:1px solid var(--bf-border);border-radius:var(--bf-radius);padding:4px;box-shadow:var(--bf-shadow-md);z-index:50;animation:bf-scale-in .1s ease}.bf-action-btn{all:unset;display:flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:var(--bf-radius-sm);color:var(--bf-text-secondary);cursor:pointer;transition:all var(--bf-transition);-webkit-user-select:none;user-select:none}.bf-action-btn:hover{background:var(--bf-primary-bg);color:var(--bf-primary)}.bf-action-btn:disabled{opacity:.3;cursor:not-allowed}.bf-action-delete:hover{background:#ef44441a;color:var(--bf-error)}.bf-action-separator{width:1px;background:var(--bf-border);margin:4px 2px}.bf-block-hover-hint{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);background:#6366f1e6;color:#fff;padding:6px 16px;border-radius:20px;font-size:12px;font-weight:600;letter-spacing:.3px;pointer-events:none;z-index:40;animation:bf-fade-in .15s ease;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.bf-add-block{position:relative;height:24px;display:flex;align-items:center;justify-content:center;z-index:20}.bf-add-block-prominent{height:auto;margin-top:16px}.bf-add-block-line{position:relative;width:100%;display:flex;align-items:center;justify-content:center}.bf-add-block-line:before{content:"";position:absolute;left:24px;right:24px;height:1px;background:transparent;transition:background var(--bf-transition)}.bf-add-block:hover .bf-add-block-line:before{background:linear-gradient(90deg,transparent,var(--bf-primary),transparent)}.bf-add-block-btn{all:unset;position:relative;z-index:2;display:flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:50%;background:var(--bf-surface);border:2px solid var(--bf-border);color:var(--bf-text-secondary);cursor:pointer;transition:all var(--bf-transition);font-size:18px;font-weight:300;line-height:1;opacity:0}.bf-add-block:hover .bf-add-block-btn,.bf-add-block-prominent .bf-add-block-btn{opacity:1}.bf-add-block-btn:hover{border-color:var(--bf-primary);color:var(--bf-primary);background:var(--bf-primary-bg);transform:scale(1.15);box-shadow:0 2px 8px #6366f140}.bf-add-block-icon{display:flex;align-items:center;justify-content:center;transition:transform .2s ease}.bf-add-block-icon-open{transform:rotate(45deg)}.bf-add-block-prominent .bf-add-block-btn{width:48px;height:48px;font-size:28px;border-width:2px;border-style:dashed;border-color:var(--bf-primary);color:var(--bf-primary);background:var(--bf-primary-bg);opacity:1}.bf-add-menu{position:absolute;top:100%;left:50%;transform:translate(-50%);margin-top:8px;width:280px;background:var(--bf-surface);border:1px solid var(--bf-border);border-radius:var(--bf-radius-lg);box-shadow:var(--bf-shadow-lg);overflow:hidden;z-index:1000;animation:bf-scale-in .12s ease;font-family:var(--bf-font)}.bf-add-menu-title{padding:12px 16px 8px;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;color:var(--bf-text-secondary);border-bottom:1px solid var(--bf-border)}.bf-add-menu-group{padding:4px}.bf-add-menu-category{padding:6px 12px 4px;font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;color:var(--bf-text-secondary)}.bf-add-menu-item{all:unset;display:flex;align-items:center;gap:10px;width:100%;padding:8px 12px;border-radius:var(--bf-radius);font-size:14px;cursor:pointer;transition:background var(--bf-transition);box-sizing:border-box;color:var(--bf-text)}.bf-add-menu-item:hover{background:var(--bf-primary-bg);color:var(--bf-primary)}.bf-add-menu-item-icon{font-size:18px;width:28px;text-align:center;flex-shrink:0}.bf-add-menu-item-label{font-weight:500}.bf-empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:300px;color:var(--bf-text-secondary);text-align:center;padding:40px}.bf-empty-icon{font-size:48px;margin-bottom:16px;opacity:.5}.bf-empty-title{font-size:20px;font-weight:600;color:var(--bf-text);margin:0 0 8px}.bf-empty-text{font-size:15px;margin:0 0 24px}.bf-block-error{padding:16px;background:#ef44440d;border:1px dashed var(--bf-error);border-radius:var(--bf-radius);color:var(--bf-error);font-size:14px;text-align:center}.bf-slash-menu{position:fixed;z-index:1000;width:320px;max-height:380px;background:var(--bf-surface);border:1px solid var(--bf-border);border-radius:var(--bf-radius-lg);box-shadow:var(--bf-shadow-lg);overflow:hidden;animation:bf-slide-up .15s ease;font-family:var(--bf-font)}.bf-slash-menu-header{padding:8px;border-bottom:1px solid var(--bf-border)}.bf-slash-menu-input{width:100%;padding:8px 12px;border:1px solid var(--bf-border);border-radius:var(--bf-radius);font-size:14px;outline:none;background:var(--bf-surface-2);color:var(--bf-text);font-family:var(--bf-font);box-sizing:border-box}.bf-slash-menu-input:focus{border-color:var(--bf-primary);box-shadow:0 0 0 2px #6366f126}.bf-slash-menu-items{max-height:300px;overflow-y:auto;padding:4px}.bf-slash-menu-group{margin-bottom:4px}.bf-slash-menu-category{padding:6px 12px 4px;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.5px;color:var(--bf-text-secondary)}.bf-slash-menu-item{all:unset;display:flex;align-items:center;gap:10px;width:100%;padding:8px 12px;border-radius:var(--bf-radius);font-size:14px;cursor:pointer;transition:background var(--bf-transition);box-sizing:border-box;color:var(--bf-text)}.bf-slash-menu-item:hover,.bf-slash-menu-item-active{background:var(--bf-primary-bg)}.bf-slash-menu-icon{font-size:18px;width:24px;text-align:center;flex-shrink:0}.bf-slash-menu-empty{padding:20px;text-align:center;color:var(--bf-text-secondary);font-size:14px}.bf-editable-text{outline:none;min-height:1em;cursor:text;border-radius:4px;transition:box-shadow var(--bf-transition)}.bf-editable-text:empty:before{content:attr(data-placeholder);color:var(--bf-text-secondary);opacity:.5;pointer-events:none}.bf-editable-text:focus{outline:none;box-shadow:inset 0 0 0 1px #6366f14d}@keyframes bf-fade-in{0%{opacity:0}to{opacity:1}}@keyframes bf-slide-up{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes bf-scale-in{0%{opacity:0;transform:scale(.95) translate(-50%)}to{opacity:1;transform:scale(1) translate(-50%)}}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:#f1f5f9;color:#0f172a;min-height:100vh}.demo-app{display:flex;flex-direction:column;min-height:100vh}.demo-header{display:flex;align-items:center;justify-content:space-between;padding:10px 20px;background:linear-gradient(135deg,#0f172a,#1e293b);color:#fff;position:sticky;top:0;z-index:100;box-shadow:0 4px 20px #0003;gap:12px;flex-wrap:wrap}.demo-header-left{display:flex;align-items:center;gap:10px;flex-shrink:0}.demo-logo{font-size:18px;font-weight:800;display:flex;align-items:center;gap:6px;background:linear-gradient(135deg,#818cf8,#f472b6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;white-space:nowrap}.demo-logo-icon{-webkit-text-fill-color:initial;font-size:20px}.demo-badge{padding:2px 7px;background:#6366f133;color:#a5b4fc;font-size:10px;font-weight:600;border-radius:4px;text-transform:uppercase;letter-spacing:.5px;white-space:nowrap}.demo-header-actions{display:flex;align-items:center;gap:4px;flex-wrap:wrap}.demo-status{font-size:12px;color:#94a3b8;margin-right:4px;white-space:nowrap}.demo-btn{all:unset;display:inline-flex;align-items:center;gap:5px;padding:6px 12px;font-size:13px;font-weight:500;border-radius:6px;cursor:pointer;transition:all .15s ease;font-family:inherit;white-space:nowrap}.demo-btn:disabled{opacity:.35;cursor:not-allowed}.demo-btn-ghost{color:#cbd5e1;background:#ffffff0f}.demo-btn-ghost:hover:not(:disabled){background:#ffffff24;color:#fff}.demo-btn-primary{background:linear-gradient(135deg,#6366f1,#8b5cf6);color:#fff;font-weight:600}.demo-btn-primary:hover:not(:disabled){background:linear-gradient(135deg,#818cf8,#a78bfa);box-shadow:0 4px 12px #6366f159}.demo-hint{padding:7px 16px;background:#eff6ff;color:#3b82f6;font-size:12px;text-align:center;border-bottom:1px solid #dbeafe;flex-wrap:wrap;display:flex;align-items:center;justify-content:center;gap:4px}.demo-hint kbd{display:inline-flex;align-items:center;padding:1px 5px;background:#fff;border:1px solid #93c5fd;border-radius:3px;font-family:monospace;font-size:11px;box-shadow:0 1px #93c5fd}.demo-main{flex:1;display:flex;padding:24px 16px;max-width:100%}.demo-canvas-container{flex:1;width:100%;max-width:100%}.demo-canvas{background:#fff;border-radius:12px;box-shadow:0 1px 3px #0000000d,0 6px 24px #00000012;padding:12px 12px 24px 52px;min-height:60vh;width:100%}.demo-json-panel{width:min(440px,90vw);background:#1e293b;border-radius:12px;overflow:hidden;position:fixed;right:16px;top:70px;bottom:70px;z-index:200;box-shadow:0 12px 40px #00000059;display:flex;flex-direction:column;animation:bf-slide-in-right .2s ease}.demo-json-header{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;background:#0f172a;color:#e2e8f0;font-size:14px;font-weight:600}.demo-json-content{flex:1;overflow:auto;padding:16px;margin:0;font-family:JetBrains Mono,Fira Code,Courier New,monospace;font-size:12px;line-height:1.6;color:#a5b4fc;white-space:pre-wrap;word-break:break-all}.demo-footer{padding:10px 20px;text-align:center;color:#94a3b8;font-size:12px;border-top:1px solid #e2e8f0;background:#fff}@keyframes bf-slide-in-right{0%{opacity:0;transform:translate(20px)}to{opacity:1;transform:translate(0)}}@media(min-width:1280px){.demo-main{padding:32px 48px;max-width:1400px;margin:0 auto;width:100%}.demo-canvas{padding:16px 24px 32px 60px;border-radius:16px}}@media(min-width:768px)and (max-width:1279px){.demo-main{padding:24px}.demo-canvas{padding:14px 16px 24px 54px}}@media(max-width:767px){.demo-header{padding:8px 12px}.demo-status{display:none}.demo-btn{padding:6px 10px;font-size:12px}.demo-hint{font-size:11px;padding:6px 10px}.demo-main{padding:12px 8px}.demo-canvas{padding:12px 8px 20px;border-radius:10px}.bf-block-sidebar{display:none!important}.bf-block-actions{right:4px;top:-36px;gap:1px;padding:3px}.demo-json-panel{width:calc(100vw - 16px);right:8px;left:8px;top:60px;bottom:50px}}@media(max-width:400px){.demo-header-actions{gap:2px}.demo-btn{padding:5px 8px;font-size:11px}}