:root{--surface:#ffffff;--surface-muted:#f8fafc;--border:#dbe3ee;--text-main:#0f172a;--text-muted:#475569;--primary:#2563eb;--primary-dark:#1e40af;--accent:#06b6d4;--shadow-soft:0 10px 30px rgba(15,23,42,0.08);--gradient:linear-gradient(135deg,#2563eb,#06b6d4);}
.tbg-hero-pills{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px;padding:0;list-style:none;}
.tbg-hero-pills li{margin:0;font-size:13px;font-weight:600;letter-spacing:0.02em;text-transform:uppercase;color:var(--text-muted);background:var(--surface-muted);border:1px solid var(--border);border-radius:999px;padding:6px 12px;}
.tbg-studio{margin:0 0 2.5rem;}
.tbg-shell{background:var(--surface);border:1px solid var(--border);border-radius:20px;box-shadow:var(--shadow-soft);overflow:hidden;}
.tbg-shell-inner{padding:clamp(16px,4vw,28px);}
.tbg-dropzone{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;min-height:132px;padding:20px;border:2px dashed var(--border);border-radius:16px;background:linear-gradient(145deg,var(--surface-muted) 0%,transparent 55%);cursor:pointer;transition:border-color 0.2s ease,background 0.2s ease;margin-bottom:20px;-webkit-tap-highlight-color:transparent;}
.tbg-dropzone:hover,.tbg-dropzone:focus-within{border-color:var(--primary);background:linear-gradient(145deg,color-mix(in srgb,var(--primary) 8%,var(--surface-muted)) 0%,transparent 60%);}
.tbg-layout{display:none;}
.tbg-sticky-bar{display:none;}
.tbg-studio.tbg-has-image .tbg-dropzone{display:none;}
.tbg-studio.tbg-has-image .tbg-layout{display:grid;}
.tbg-studio.tbg-has-image .tbg-sticky-bar{display:block;}
.tbg-dropzone-icon{width:44px;height:44px;border-radius:12px;background:color-mix(in srgb,var(--primary) 15%,transparent);color:var(--primary);display:flex;align-items:center;justify-content:center;font-size:1.15rem;}
.tbg-dropzone-title{font-size:1rem;font-weight:700;color:var(--text-main);margin:0;text-align:center;}
.tbg-dropzone-hint{font-size:0.8125rem;color:var(--text-muted);margin:0;text-align:center;max-width:280px;line-height:1.45;}
.tbg-file-input{position:absolute;width:0;height:0;opacity:0;pointer-events:none;}
.tbg-layout{grid-template-columns:1fr;gap:20px;}
@media (min-width:992px){.tbg-layout{grid-template-columns:minmax(240px,280px) 1fr;gap:24px;align-items:start;}}
.tbg-control-stack{display:flex;flex-direction:column;gap:16px;}
.tbg-panel{background:var(--surface-muted);border:1px solid var(--border);border-radius:14px;padding:14px 16px;}
.tbg-panel-title{font-size:0.6875rem;font-weight:700;letter-spacing:0.08em;text-transform:uppercase;color:var(--text-muted);margin:0 0 10px;}
.tbg-select{width:100%;padding:10px 12px;border-radius:10px;border:1px solid var(--border);background:var(--surface);color:var(--text-main);font-size:0.9375rem;}
.tbg-slider-row{display:grid;grid-template-columns:1fr auto;gap:10px;align-items:center;}
.tbg-slider-row input[type="range"]{width:100%;accent-color:var(--primary);}
.tbg-slider-val{font-variant-numeric:tabular-nums;font-size:0.875rem;font-weight:600;color:var(--text-main);min-width:2rem;text-align:right;}
.tbg-actions{display:flex;flex-wrap:wrap;gap:10px;}
.tbg-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 16px;border-radius:10px;font-size:0.875rem;font-weight:600;border:none;cursor:pointer;transition:transform 0.15s ease,opacity 0.15s ease;-webkit-tap-highlight-color:transparent;}
.tbg-btn:active{transform:scale(0.98);}
.tbg-btn--primary{background:var(--primary);color:#fff;}
.tbg-btn--primary:hover{opacity:0.92;}
.tbg-btn--ghost{background:transparent;color:var(--text-main);border:1px solid var(--border);}
.tbg-btn--ghost:hover{border-color:var(--primary);color:var(--primary);}
.tbg-btn--accent{background:color-mix(in srgb,var(--accent) 85%,#000);color:#fff;}
.tbg-btn--accent:hover{opacity:0.92;}
.tbg-tool-row{display:flex;flex-wrap:wrap;gap:8px;}
.tbg-tool-row--spaced{margin-top:12px;}
.tbg-tool-btn{display:inline-flex;align-items:center;gap:6px;padding:8px 12px;border-radius:999px;font-size:0.8125rem;font-weight:600;border:1px solid var(--border);background:var(--surface);color:var(--text-main);cursor:pointer;transition:background 0.15s ease,border-color 0.15s ease;}
.tbg-tool-btn:hover{border-color:var(--primary);}
.tbg-tool-btn.tbg-tool-btn--on{background:color-mix(in srgb,var(--primary) 18%,var(--surface));border-color:var(--primary);color:var(--primary-dark);}
.tbg-view-tabs{display:none;gap:8px;margin-bottom:12px;}
@media (max-width:991px){.tbg-view-tabs{display:flex;}}
.tbg-view-tab{flex:1;padding:10px;border-radius:10px;border:1px solid var(--border);background:var(--surface-muted);font-size:0.8125rem;font-weight:700;cursor:pointer;color:var(--text-muted);}
.tbg-view-tab.tbg-view-tab--active{background:var(--surface);border-color:var(--primary);color:var(--primary);}
.tbg-canvas-grid{display:grid;grid-template-columns:1fr;gap:16px;}
@media (min-width:992px){.tbg-canvas-grid{grid-template-columns:1fr 1fr;}}
.tbg-pane{display:flex;flex-direction:column;gap:8px;}
@media (max-width:991px){.tbg-canvas-grid .tbg-pane[aria-hidden="true"]{display:none!important;}}
@media (min-width:992px){.tbg-canvas-grid .tbg-pane{display:flex!important;}}
.tbg-pane-head{font-size:0.75rem;font-weight:700;letter-spacing:0.06em;text-transform:uppercase;color:var(--text-muted);margin:0;}
.tbg-canvas-frame{position:relative;border-radius:14px;border:1px solid var(--border);background:var(--surface-muted);overflow:hidden;min-height:200px;}
.tbg-canvas-frame--result{background:repeating-conic-gradient(#e8e8e8 0% 25%,#fff 0% 50%) 50% / 20px 20px;}
.tbg-canvas-inner{position:relative;width:100%;aspect-ratio:1;max-height:min(56vh,520px);display:flex;align-items:center;justify-content:center;}
.tbg-canvas-inner canvas{max-width:100%;max-height:100%;width:auto;height:auto;display:none;border-radius:8px;}
.tbg-placeholder{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;color:var(--text-muted);font-size:0.875rem;text-align:center;padding:16px;}
.tbg-placeholder i{font-size:1.75rem;opacity:0.45;}
.tbg-backdrop-bar{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:4px;}
.tbg-backdrop-label{font-size:0.75rem;font-weight:600;color:var(--text-muted);}
.tbg-backdrop-swatches{display:flex;flex-wrap:wrap;gap:8px;}
.tbg-backdrop-swatch{width:36px;height:36px;border-radius:10px;border:2px solid var(--border);padding:0;cursor:pointer;background:var(--surface);transition:transform 0.15s ease,border-color 0.15s ease;}
.tbg-backdrop-swatch:hover{transform:translateY(-2px);}
.tbg-backdrop-swatch.tbg-backdrop-swatch--on{border-color:var(--primary);box-shadow:0 0 0 2px color-mix(in srgb,var(--primary) 35%,transparent);}
.tbg-swatch-checker{background:repeating-conic-gradient(#ccc 0% 25%,#fff 0% 50%) 50% / 12px 12px;}
.tbg-swatch-white{background:#fff;}
.tbg-swatch-black{background:#111;}
.tbg-swatch-red{background:#e11d48;}
.tbg-swatch-blue{background:#2563eb;}
.tbg-swatch-green{background:#16a34a;}
.tbg-stats{display:none;grid-template-columns:repeat(2,1fr);gap:10px;margin-top:16px;}
@media (min-width:576px){.tbg-stats{grid-template-columns:repeat(4,1fr);}}
.tbg-stat{background:var(--surface-muted);border:1px solid var(--border);border-radius:12px;padding:12px;text-align:center;}
.tbg-stat-val{font-size:1.125rem;font-weight:800;font-variant-numeric:tabular-nums;color:var(--text-main);}
.tbg-stat-label{font-size:0.6875rem;font-weight:600;text-transform:uppercase;letter-spacing:0.05em;color:var(--text-muted);margin-top:4px;}
.tbg-hint{display:none;margin-top:14px;padding:12px 14px;border-radius:12px;border:1px solid var(--border);background:color-mix(in srgb,var(--accent) 6%,var(--surface));font-size:0.8125rem;line-height:1.5;color:var(--text-main);}
.tbg-hint strong{color:var(--primary-dark);}
.tbg-sticky-bar{position:sticky;bottom:0;z-index:5;margin:16px -8px -8px;padding:12px 8px 8px;background:linear-gradient(to top,var(--surface) 70%,transparent);}
@media (min-width:992px){.tbg-sticky-bar{position:static;margin:0;padding:0;background:none;}}
.tbg-sticky-inner{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;}
@media (min-width:992px){.tbg-sticky-inner{justify-content:flex-start;}}
.erase-mode .tbg-canvas-inner{cursor:crosshair;}
.restore-mode .tbg-canvas-inner{cursor:cell;}
.refine-mode .tbg-canvas-inner{cursor:alias;}
.tbg-article{margin-top:2rem;padding-bottom:2rem;}
.tbg-article h2{font-size:1.5rem;font-weight:800;margin:2rem 0 0.75rem;color:var(--text-main);}
.tbg-article h3{font-size:1.15rem;font-weight:700;margin:1.5rem 0 0.5rem;color:var(--text-main);}
.tbg-article p,.tbg-article li{color:var(--text-main);line-height:1.65;font-size:0.9375rem;}
.tbg-article p{margin:0 0 1rem;}
.tbg-callout{border-left:4px solid var(--primary);padding:14px 16px;margin:1.25rem 0;background:var(--surface-muted);border-radius:0 12px 12px 0;font-size:0.9375rem;line-height:1.6;}
.tbg-table-wrap{overflow-x:auto;margin:1rem 0;border:1px solid var(--border);border-radius:12px;}
.tbg-table{width:100%;border-collapse:collapse;font-size:0.875rem;}
.tbg-table th,.tbg-table td{padding:10px 14px;text-align:left;border-bottom:1px solid var(--border);}
.tbg-table th{background:var(--surface-muted);font-weight:700;font-size:0.75rem;text-transform:uppercase;letter-spacing:0.05em;color:var(--text-muted);}
.tbg-table tr:last-child td{border-bottom:none;}
.tbg-dl{margin:1rem 0;}
.tbg-dl dt{font-weight:700;margin-top:1rem;font-size:0.9375rem;}
.tbg-dl dd{margin:0.35rem 0 0;padding:0;color:var(--text-muted);font-size:0.9375rem;line-height:1.6;}
.tbg-steps{counter-reset:tbgstep;margin:1.25rem 0;padding:0;list-style:none;}
.tbg-steps li{counter-increment:tbgstep;position:relative;padding-left:2.5rem;margin-bottom:0.85rem;font-size:0.9375rem;line-height:1.55;color:var(--text-main);}
.tbg-steps li::before{content:counter(tbgstep);position:absolute;left:0;top:0;width:1.75rem;height:1.75rem;border-radius:8px;background:var(--primary);color:#fff;font-size:0.75rem;font-weight:800;display:flex;align-items:center;justify-content:center;}