:root{--surface:#ffffff;--surface-muted:#f1f5f9;--border:#e2e8f0;--text-main:#0f172a;--text-muted:#64748b;--primary:#2563eb;--primary-dark:#1d4ed8;--accent:#2563eb;--shadow-soft:0 8px 30px rgba(15,23,42,0.08);color:var(--text-main,#0f172a);background-color:var(--surface,#fff);}
.fdg-studio{border-radius:20px;overflow:hidden;margin-bottom:1.5rem;border:1px solid var(--border,#e2e8f0);background:var(--surface,#fff);box-shadow:var(--shadow-soft,0 8px 30px rgba(15,23,42,0.08));}
.fdg-split{display:flex;flex-direction:column;gap:0;}
.fdg-options{display:flex;flex-direction:column;gap:0;background:var(--surface-muted,#f1f5f9);border-bottom:1px solid var(--border,#e2e8f0);}
.fdg-result{display:flex;flex-direction:column;gap:0.65rem;min-width:0;padding:clamp(12px,3vw,18px);background:linear-gradient(180deg,var(--surface,#fff) 0%,var(--surface-muted,#f1f5f9) 100%);}
.fdg-split-label{display:block;font-size:0.6875rem;font-weight:700;letter-spacing:0.08em;text-transform:uppercase;color:var(--text-muted,#64748b);padding:0 4px;}
.fdg-options .fdg-split-label{padding:14px 18px 0 18px;}
.fdg-result .fdg-split-label{padding:0 4px 0 4px;}
@media (min-width:768px){.fdg-split{flex-direction:row;align-items:stretch;gap:0;}.fdg-options{flex:0 0 min(340px,38vw);max-width:380px;border-bottom:none;border-right:1px solid var(--border,#e2e8f0);}.fdg-result{flex:1;min-width:0;padding:clamp(14px,2vw,22px);}.fdg-options .fdg-split-label{padding-top:16px;}}
.fdg-canvas-frame{position:relative;width:100%;border-radius:16px;border:1px solid var(--border,#e2e8f0);background:var(--surface,#fff);box-shadow:inset 0 1px 0 rgba(255,255,255,0.9);flex:1;min-height:min(52vh,420px);display:flex;align-items:center;justify-content:center;}
.fdg-canvas-frame::after{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;box-shadow:inset 0 0 0 1px rgba(15,23,42,0.04);}
#dendrite-canvas{display:block;width:100%;height:auto;max-height:min(70vh,620px);vertical-align:middle;cursor:crosshair;touch-action:pan-y;background:var(--surface,#fff);}
.fdg-dock{display:flex;flex-direction:column;gap:8px;padding:12px 16px 16px;}
@media (min-width:400px){.fdg-dock{flex-direction:row;flex-wrap:wrap;}}
@media (min-width:768px){.fdg-dock{flex-direction:column;}}
.fdg-dock button{font-family:inherit;font-size:0.875rem;font-weight:600;letter-spacing:0.02em;border-radius:12px;border:1px solid var(--border,#e2e8f0);padding:10px 16px;background:var(--surface,#fff);color:var(--text-main,#0f172a);transition:transform 0.15s ease,border-color 0.15s ease,background 0.15s ease;flex:1;min-width:0;}
@media (min-width:400px) and (max-width:767px){.fdg-dock button{flex:1 1 calc(50% - 4px);}}
.fdg-dock button:hover{border-color:var(--primary,#2563eb);background:var(--surface-muted,#f1f5f9);color:var(--primary,#2563eb);}
.fdg-dock button:active{transform:scale(0.98);}
.fdg-dock .fdg-btn-primary{background:linear-gradient(135deg,var(--primary,#2563eb) 0%,var(--primary-dark,#1d4ed8) 100%);border-color:transparent;color:#fff;}
.fdg-dock .fdg-btn-primary:hover{color:#fff;border-color:transparent;filter:brightness(1.05);background:linear-gradient(135deg,var(--primary,#2563eb) 0%,var(--primary-dark,#1d4ed8) 100%);}
.fdg-mixer{padding:0 16px 18px;background:transparent;}
.fdg-mixer-stack{display:flex;flex-direction:column;gap:12px;}
.fdg-field{display:flex;flex-direction:column;gap:8px;padding:12px;border-radius:12px;border:1px solid var(--border,#e2e8f0);background:var(--surface,#fff);}
.fdg-field label{font-size:0.8125rem;font-weight:600;color:var(--text-muted,#64748b);text-transform:uppercase;letter-spacing:0.06em;}
.fdg-field-top{display:flex;align-items:baseline;justify-content:space-between;gap:8px;}
.fdg-chip{font-variant-numeric:tabular-nums;font-size:0.875rem;font-weight:700;color:var(--primary,#2563eb);background:rgba(37,99,235,0.1);border-radius:8px;padding:4px 10px;}
.fdg-field input[type="range"]{width:100%;accent-color:var(--primary,#2563eb);}
.fdg-field select{width:100%;padding:10px 12px;border-radius:10px;border:1px solid var(--border,#e2e8f0);background:var(--surface,#fff);color:var(--text-main,#0f172a);font-size:0.9375rem;}
.fdg-prose{padding-bottom:3rem;}
.fdg-prose h2{font-size:clamp(1.35rem,3vw,1.65rem);margin-top:2.25rem;margin-bottom:0.75rem;font-weight:700;color:var(--text-main,#0f172a);}
.fdg-prose h2:first-child{margin-top:0;}
.fdg-prose h3{font-size:1.05rem;margin-top:1.5rem;margin-bottom:0.5rem;font-weight:600;color:var(--text-main,#0f172a);}
.fdg-prose p,.fdg-prose li{color:var(--text-muted,#64748b);line-height:1.65;}
.fdg-prose p{margin-bottom:0.85rem;}
.fdg-lede{font-size:1.05rem;color:var(--text-main,#0f172a);}
.fdg-table-wrap{overflow-x:auto;border-radius:14px;border:1px solid var(--border,#e2e8f0);margin:1rem 0;}
.fdg-table{width:100%;border-collapse:collapse;font-size:0.9rem;}
.fdg-table th,.fdg-table td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--border,#e2e8f0);}
.fdg-table th{background:var(--surface-muted,#f1f5f9);color:var(--text-main,#0f172a);font-weight:600;}
.fdg-table tr:last-child td{border-bottom:none;}
.fdg-dl{margin:1rem 0;}
.fdg-dl dt{font-weight:600;color:var(--text-main,#0f172a);margin-top:0.85rem;}
.fdg-dl dt:first-child{margin-top:0;}
.fdg-dl dd{margin:0.25rem 0 0 0;color:var(--text-muted,#64748b);}
.fdg-callout{border-radius:14px;border-left:4px solid var(--primary,#2563eb);padding:14px 18px;background:var(--surface-muted,#f1f5f9);margin:1.25rem 0;}
.fdg-callout strong{color:var(--text-main,#0f172a);}
.fdg-muted{font-size:0.9rem;color:var(--text-muted,#64748b);margin-bottom:1rem;}
.bmc-math .faq-section{margin-top:2.5rem;}
.bmc-math .related-tools-section{margin-top:2rem;}
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0;}