:root{--surface:#ffffff;--surface-muted:#f8fafc;--border:#e2e8f0;--text-main:#0f172a;--text-muted:#64748b;--primary:#2563eb;--primary-dark:#1d4ed8;--accent:#0ea5e9;--shadow-soft:0 8px 30px rgba(15,23,42,0.08);--gradient:linear-gradient(135deg,#eff6ff 0%,#f8fafc 100%);--sbg-radius:18px;--sbg-radius-sm:12px;--sbg-ink:var(--text-main);--sbg-muted:var(--text-muted);--sbg-line:var(--border);--sbg-surface:var(--surface);--sbg-glow:linear-gradient(135deg,#1e1b4b 0%,#312e81 35%,#4c1d95 70%,#5b21b6 100%);--sbg-glass:rgba(255,255,255,0.06);--sbg-safe:max(0.65rem,env(safe-area-inset-bottom));}
.sbg-wrap{margin:0 0 2rem;}
.sbg-chrome{background:var(--sbg-surface);border:1px solid var(--sbg-line);border-radius:var(--sbg-radius);box-shadow:var(--shadow-soft);overflow:hidden;}
.sbg-stage{position:relative;min-height:min(52vw,280px);padding:1.25rem 1rem 1.5rem;background:var(--sbg-glow);isolation:isolate;}
@media (min-width:768px){.sbg-stage{min-height:320px;padding:1.75rem;}}
.sbg-stage::after{content:"";position:absolute;inset:0;background:radial-gradient(ellipse 80% 60% at 50% 100%,rgba(255,255,255,0.14),transparent 55%);pointer-events:none;z-index:0;}
.sbg-stage-inner{position:relative;z-index:1;display:flex;align-items:center;justify-content:center;min-height:min(48vw,240px);}
@media (min-width:768px){.sbg-stage-inner{min-height:280px;}}
.sbg-svg-slot{display:flex;align-items:center;justify-content:center;padding:0.75rem;border-radius:var(--sbg-radius-sm);background:var(--sbg-glass);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);box-shadow:0 4px 24px rgba(0,0,0,0.25),inset 0 1px 0 rgba(255,255,255,0.12);}
.sbg-svg-slot svg{display:block;max-width:100%;height:auto;filter:drop-shadow(0 12px 28px rgba(0,0,0,0.35));}
.sbg-live-pill{position:absolute;top:0.85rem;left:50%;transform:translateX(-50%);z-index:2;display:inline-flex;align-items:center;gap:0.4rem;padding:0.35rem 0.75rem;font-size:0.6875rem;font-weight:700;letter-spacing:0.06em;text-transform:uppercase;color:rgba(255,255,255,0.92);background:rgba(0,0,0,0.35);border:1px solid rgba(255,255,255,0.18);border-radius:999px;pointer-events:none;}
.sbg-live-pill::before{content:"";width:6px;height:6px;border-radius:50%;background:#34d399;box-shadow:0 0 0 2px rgba(52,211,153,0.35);animation:sbg-pulse 1.6s ease-in-out infinite;}
@keyframes sbg-pulse{0%,100%{opacity:1;}50%{opacity:0.45;}}
.sbg-metrics{display:flex;flex-wrap:nowrap;gap:0.5rem;padding:0.75rem 1rem;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none;border-bottom:1px solid var(--sbg-line);background:linear-gradient(180deg,var(--surface-muted) 0%,var(--sbg-surface) 100%);}
.sbg-metrics::-webkit-scrollbar{display:none;}
.sbg-metric{flex:0 0 auto;min-width:5.5rem;padding:0.5rem 0.65rem;border-radius:10px;border:1px solid var(--sbg-line);background:var(--sbg-surface);}
.sbg-metric-k{display:block;font-size:0.625rem;font-weight:700;letter-spacing:0.04em;text-transform:uppercase;color:var(--sbg-muted);}
.sbg-metric-v{display:block;font-size:0.9375rem;font-weight:700;color:var(--sbg-ink);margin-top:0.15rem;}
.sbg-main{display:flex;flex-direction:column;gap:1rem;}
@media (min-width:992px){.sbg-main{flex-direction:row;align-items:stretch;}}
.sbg-deck{padding:1rem 1rem calc(1.25rem + 4.25rem);display:flex;flex-direction:column;gap:1rem;}
@media (min-width:768px){.sbg-deck{padding:1.25rem 1.5rem 1.5rem;}}
@media (min-width:992px){.sbg-deck{flex:1;min-width:0;}}
.sbg-field{display:flex;flex-direction:column;gap:0.4rem;}
.sbg-field label{font-size:0.8125rem;font-weight:600;color:var(--sbg-ink);}
.sbg-field-hint{font-size:0.75rem;color:var(--sbg-muted);margin:0;line-height:1.35;}
.sbg-num{width:100%;max-width:8rem;padding:0.55rem 0.75rem;font-size:1rem;font-weight:600;border:1px solid var(--sbg-line);border-radius:10px;background:var(--sbg-surface);color:var(--sbg-ink);}
.sbg-num:focus{outline:2px solid var(--primary);outline-offset:1px;}
.sbg-slider{width:100%;height:6px;border-radius:999px;background:var(--surface-muted);accent-color:var(--primary);-webkit-appearance:none;appearance:none;}
.sbg-slider::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:18px;height:18px;border-radius:50%;background:var(--primary);border:2px solid var(--sbg-surface);box-shadow:0 2px 8px rgba(37,99,235,0.35);cursor:pointer;}
.sbg-slider::-moz-range-thumb{width:18px;height:18px;border-radius:50%;background:var(--primary);border:2px solid var(--sbg-surface);cursor:pointer;}
.sbg-color-row{display:grid;grid-template-columns:1fr 1fr;gap:0.75rem;}
@media (max-width:380px){.sbg-color-row{grid-template-columns:1fr;}}
.sbg-swatch{display:flex;align-items:center;gap:0.65rem;padding:0.55rem 0.65rem;border:1px solid var(--sbg-line);border-radius:12px;background:var(--surface-muted);}
.sbg-swatch input[type="color"]{width:40px;height:40px;padding:0;border:none;border-radius:10px;cursor:pointer;background:transparent;}
.sbg-swatch span{font-size:0.75rem;font-weight:600;color:var(--sbg-ink);}
.sbg-toggle{display:flex;align-items:center;gap:0.5rem;font-size:0.8125rem;font-weight:600;color:var(--sbg-ink);cursor:pointer;-webkit-tap-highlight-color:transparent;}
.sbg-toggle input{width:1rem;height:1rem;accent-color:var(--primary);}
.sbg-actions{display:flex;flex-direction:column;gap:0.5rem;}
@media (min-width:480px){.sbg-actions{flex-direction:row;flex-wrap:wrap;}}
.sbg-btn{display:inline-flex;align-items:center;justify-content:center;gap:0.35rem;padding:0.65rem 1rem;font-size:0.875rem;font-weight:700;border-radius:12px;border:1px solid transparent;cursor:pointer;-webkit-tap-highlight-color:transparent;transition:background 0.15s,transform 0.1s;}
.sbg-btn:active{transform:scale(0.98);}
.sbg-btn:focus-visible{outline:2px solid var(--primary);outline-offset:2px;}
.sbg-btn--primary{background:var(--primary);color:#fff;}
.sbg-btn--primary:hover{background:var(--primary-dark);}
.sbg-btn--ghost{background:var(--surface-muted);color:var(--sbg-ink);border-color:var(--sbg-line);}
.sbg-btn--ghost:hover{background:#e2e8f0;}
.sbg-btn--dark{background:var(--sbg-ink);color:#fff;}
.sbg-btn--dark:hover{background:#1e293b;}
.sbg-status{min-height:1.25rem;font-size:0.8125rem;color:var(--sbg-muted);margin:0;}
.sbg-status.sbg-status--ok{color:#059669;}
.sbg-status.sbg-status--err{color:#dc2626;}
.sbg-markup{border:1px solid var(--sbg-line);border-radius:var(--sbg-radius-sm);background:var(--surface-muted);display:flex;flex-direction:column;overflow:hidden;margin:0 1rem 1rem;}
@media (min-width:768px){.sbg-markup{margin:0 1.5rem 1.5rem;}}
@media (min-width:992px){.sbg-markup{margin:1.25rem 1.5rem 1.5rem 0;flex:0 0 38%;max-width:420px;}}
.sbg-markup-title{margin:0;padding:0.75rem 1rem;font-size:0.8125rem;font-weight:700;line-height:1.35;color:var(--sbg-ink);border-bottom:1px solid var(--sbg-line);background:var(--sbg-surface);}
.sbg-code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:0.6875rem;line-height:1.45;color:var(--sbg-ink);margin:0;padding:0.75rem 1rem 1rem;overflow:auto;white-space:pre-wrap;word-break:break-all;background:var(--sbg-surface);}
.sbg-prose-block{margin:2rem 0;padding:0;}
.sbg-prose-block h2{font-size:clamp(1.25rem,3vw,1.5rem);font-weight:700;color:var(--sbg-ink);margin:0 0 0.75rem;line-height:1.25;}
.sbg-prose-block p{font-size:0.9375rem;line-height:1.65;color:var(--sbg-muted);margin:0 0 1rem;}
.sbg-prose-block p:last-child{margin-bottom:0;}
.sbg-prose-block ul{margin:0 0 1rem;padding-left:1.2rem;color:var(--sbg-muted);font-size:0.9375rem;line-height:1.6;}
.sbg-prose-block li{margin-bottom:0.35rem;}
.sbg-dl{margin:0;}
.sbg-dl dt{font-weight:700;color:var(--sbg-ink);font-size:0.9375rem;margin-top:1rem;}
.sbg-dl dt:first-child{margin-top:0;}
.sbg-dl dd{margin:0.35rem 0 0;padding:0;font-size:0.9375rem;line-height:1.6;color:var(--sbg-muted);}
.sbg-callout{margin:1.75rem 0;padding:1rem 1.15rem;border-left:4px solid var(--accent);border-radius:0 var(--sbg-radius-sm) var(--sbg-radius-sm) 0;background:var(--surface-muted);font-size:0.9375rem;line-height:1.55;color:var(--sbg-muted);}
.sbg-callout strong{color:var(--sbg-ink);}
.internal-link{color:var(--primary);font-weight:600;text-decoration:underline;text-underline-offset:2px;}
.internal-link:hover{color:var(--primary-dark);}
.sbg-dock{position:fixed;left:0;right:0;bottom:0;z-index:40;display:flex;gap:0.5rem;padding:0.5rem 0.75rem calc(0.5rem + var(--sbg-safe));background:rgba(255,255,255,0.92);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-top:1px solid var(--sbg-line);box-shadow:0 -8px 24px rgba(15,23,42,0.06);}
.sbg-dock .sbg-btn{flex:1;padding:0.7rem 0.5rem;font-size:0.8125rem;}
@media (min-width:768px){.sbg-dock{display:none;}}