body.bmc-math{--surface:#ffffff;--surface-muted:#f8fafc;--border:#e2e8f0;--text-main:#0f172a;--text-muted:#64748b;--primary:#6366f1;--primary-dark:#4f46e5;--accent:#818cf8;--shadow-soft:0 4px 24px rgba(15,23,42,0.06);--shadow-card:0 2px 12px rgba(15,23,42,0.04);color:var(--text-main);}
.spc-pills{display:flex;flex-wrap:wrap;gap:0.5rem;margin-top:0.75rem;}
.spc-pill{display:inline-flex;align-items:center;padding:0.3rem 0.65rem;border-radius:999px;font-size:0.75rem;font-weight:600;background:linear-gradient(135deg,color-mix(in srgb,var(--primary) 12%,transparent),color-mix(in srgb,var(--primary) 6%,transparent));color:var(--primary);border:1px solid color-mix(in srgb,var(--primary) 25%,transparent);}
.spc-lab{margin-bottom:2rem;}
.spc-card{border:1px solid var(--border);border-radius:18px;overflow:hidden;background:var(--surface);box-shadow:var(--shadow-soft);}
.spc-split{display:flex;flex-direction:column;gap:0;}
.spc-panel--options{background:var(--surface-muted);border-bottom:1px solid var(--border);padding:clamp(12px,3vw,18px);}
.spc-panel--result{background:linear-gradient(180deg,var(--surface) 0%,var(--surface-muted) 100%);padding:clamp(12px,3vw,18px);min-width:0;flex:1;}
.spc-panel-label{display:block;font-size:0.6875rem;font-weight:700;letter-spacing:0.08em;text-transform:uppercase;color:var(--text-muted);margin-bottom:0.65rem;}
@media (min-width:768px){.spc-split{flex-direction:row;align-items:stretch;}.spc-panel--options{flex:0 0 min(300px,36vw);max-width:360px;border-bottom:none;border-right:1px solid var(--border);}.spc-panel--result{flex:1;}}
.spc-viewport{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:0.75rem;box-shadow:var(--shadow-card);}
.spc-canvas-wrap{display:flex;justify-content:center;align-items:center;min-height:min(72vw,360px);background:var(--surface-muted);border-radius:12px;overflow:hidden;position:relative;}
#spcCanvas{display:block;width:100%;max-width:min(520px,100%);height:auto;aspect-ratio:1;cursor:crosshair;touch-action:none;-webkit-tap-highlight-color:transparent;}
.spc-viewport-hint{font-size:0.75rem;color:var(--text-muted);margin:0.75rem 0 0;line-height:1.45;}
.spc-toolbar{background:transparent;border:none;border-radius:0;padding:0;box-shadow:none;}
.spc-toolbar-row{display:grid;grid-template-columns:1fr;gap:0.75rem;margin-bottom:1rem;}
.spc-field label{display:block;font-size:0.75rem;font-weight:600;text-transform:uppercase;letter-spacing:0.05em;color:var(--text-muted);margin-bottom:0.3rem;}
.spc-field select,.spc-field input[type="number"]{width:100%;padding:0.5rem 0.65rem;border-radius:10px;border:1px solid var(--border);background:var(--surface);color:var(--text-main);font-size:0.9375rem;}
.spc-range-head{display:flex;justify-content:space-between;align-items:baseline;font-size:0.75rem;color:var(--text-muted);}
.spc-range-val{font-weight:700;font-variant-numeric:tabular-nums;color:var(--primary);}
.spc-field input[type="range"]{width:100%;height:6px;border-radius:4px;accent-color:var(--primary);margin-top:0.35rem;}
.spc-actions{display:flex;flex-wrap:wrap;gap:0.5rem;}
.spc-btn{display:inline-flex;align-items:center;justify-content:center;padding:0.55rem 1rem;border-radius:10px;font-size:0.875rem;font-weight:600;font-family:inherit;border:1px solid var(--border);background:var(--surface-muted);color:var(--text-main);cursor:pointer;transition:background 0.15s ease,border-color 0.15s ease,transform 0.1s ease;-webkit-tap-highlight-color:transparent;}
.spc-btn:hover{border-color:var(--primary);background:color-mix(in srgb,var(--primary) 8%,var(--surface));color:var(--primary);}
.spc-btn:active{transform:scale(0.98);}
.spc-btn--main{background:var(--primary);border-color:var(--primary);color:#fff;}
.spc-btn--main:hover{background:var(--primary-dark);border-color:var(--primary-dark);color:#fff;}
.spc-btn--outline{background:transparent;}
.spc-presets{margin-top:0.5rem;padding-top:1rem;border-top:1px solid var(--border);}
@media (min-width:768px){.spc-presets{border-top:none;padding-top:0;margin-top:1rem;}}
.spc-presets-title{font-size:1rem;font-weight:700;color:var(--text-main);margin:0 0 0.75rem;}
.spc-preset-row{display:flex;flex-wrap:wrap;gap:0.5rem;}
.spc-preset{flex:1 1 min(140px,100%);padding:0.65rem 0.85rem;border-radius:12px;border:1px solid var(--border);background:var(--surface);font-size:0.8125rem;font-weight:600;color:var(--text-main);cursor:pointer;transition:border-color 0.15s ease,box-shadow 0.15s ease;text-align:left;}
.spc-preset:hover{border-color:var(--primary);box-shadow:var(--shadow-soft);}
.spc-prose{margin-bottom:2rem;}
.spc-prose h2{font-size:clamp(1.1rem,2.5vw,1.35rem);font-weight:700;color:var(--text-main);margin:1.5rem 0 0.6rem;}
.spc-prose h2:first-child{margin-top:0;}
.spc-prose p,.spc-prose li{color:var(--text-muted);line-height:1.6;margin-bottom:0.75rem;}
.spc-prose p:last-child{margin-bottom:0;}
.spc-list{margin:0.5rem 0 1rem;padding-left:1.25rem;}
.spc-list li{margin-bottom:0.4rem;}
.spc-callout{border-radius:12px;border-left:4px solid var(--primary);padding:1rem 1.1rem;background:var(--surface-muted);margin:1.25rem 0;font-size:0.9375rem;color:var(--text-main);line-height:1.55;}
.spc-updated{font-size:0.8125rem;color:var(--text-muted);margin-top:2rem;padding-top:1rem;border-top:1px solid var(--border);}
.bmc-math .faq-section{margin-top:2rem;}
.bmc-math .related-tools-section{margin-top:1.5rem;}
@media (min-width:768px){.spc-canvas-wrap{min-height:min(48vh,440px);}#spcCanvas{max-width:100%;}}