.bmc-math{--cc-surface:#fff;--cc-surface-muted:#f8fafc;--cc-border:#e2e8f0;--cc-text-main:#0f172a;--cc-text-muted:#64748b;--cc-primary:#2563eb;--cc-primary-dark:#1d4ed8;--cc-shadow:0 2px 8px rgba(0,0,0,.06);--cc-accent:#2563eb;}
.pcalc-wrap{max-width:560px;margin-bottom:2rem;}
.pcalc-card{background:var(--surface,var(--cc-surface));border:1px solid var(--border,var(--cc-border));border-radius:16px;padding:1.25rem;box-shadow:var(--shadow-soft,var(--cc-shadow));}
@media (min-width:480px){.pcalc-card{padding:1.5rem;}}
@media (min-width:768px){.pcalc-card{padding:2rem;border-radius:20px;}}
.pcalc-formula-bar{font-family:ui-monospace,monospace;font-size:0.875rem;color:var(--text-muted,var(--cc-text-muted));margin:0 0 1.25rem;padding:0.5rem 0;border-bottom:1px solid var(--border,var(--cc-border));}
.pcalc-form{margin-bottom:0;}
.pcalc-fields{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-bottom:1.25rem;}
@media (max-width:380px){.pcalc-fields{grid-template-columns:1fr;}}
.pcalc-field{min-width:0;}
.pcalc-label{display:block;font-size:0.9375rem;font-weight:600;color:var(--text-main,var(--cc-text-main));margin-bottom:0.375rem;}
.pcalc-sym{font-family:ui-monospace,monospace;color:var(--text-muted,var(--cc-text-muted));font-weight:500;}
.pcalc-input{width:100%;max-width:100%;padding:0.75rem 0.875rem;font-size:1.125rem;line-height:1.4;color:var(--text-main,var(--cc-text-main));background:var(--surface-muted,var(--cc-surface-muted));border:1px solid var(--border,var(--cc-border));border-radius:10px;box-sizing:border-box;-webkit-appearance:none;appearance:none;}
.pcalc-input:focus{outline:0;border-color:var(--primary,var(--cc-primary));box-shadow:0 0 0 3px rgba(37,99,235,.15);}
.pcalc-input::placeholder{color:var(--text-muted,var(--cc-text-muted));}
.pcalc-hint{display:block;font-size:0.75rem;color:var(--text-muted,var(--cc-text-muted));margin-top:0.25rem;}
.pcalc-actions{margin-bottom:0;}
.pcalc-btn{display:inline-flex;align-items:center;justify-content:center;width:100%;padding:0.875rem 1.5rem;font-size:1rem;font-weight:600;color:#fff;background:var(--primary,var(--cc-primary));border:0;border-radius:10px;cursor:pointer;transition:background 0.2s,transform 0.1s;-webkit-tap-highlight-color:transparent;}
.pcalc-btn:hover{background:var(--primary-dark,var(--cc-primary-dark));}
.pcalc-btn:active{transform:scale(0.98);}
.pcalc-btn:focus{outline:0;box-shadow:0 0 0 3px rgba(37,99,235,.25);}
.pcalc-result{margin-top:1.25rem;padding-top:1.25rem;border-top:1px solid var(--border,var(--cc-border));}
.pcalc-result[hidden]{display:none;}
.pcalc-result-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:0.5rem 1rem;margin-bottom:0.5rem;}
.pcalc-result-label{font-size:1rem;color:var(--text-muted,var(--cc-text-muted));}
.pcalc-result-value{font-size:1.75rem;font-weight:700;color:var(--primary,var(--cc-primary));font-variant-numeric:tabular-nums;}
@media (min-width:480px){.pcalc-result-value{font-size:2rem;}}
.pcalc-steps{margin:0 0 0.75rem;font-size:0.875rem;color:var(--text-muted,var(--cc-text-muted));line-height:1.5;}
.pcalc-interpret{margin:0;font-size:0.9375rem;color:var(--text-main,var(--cc-text-main));line-height:1.5;}
.pcalc-err{padding:0.75rem;font-size:0.875rem;color:var(--text-main,var(--cc-text-main));background:var(--surface-muted,var(--cc-surface-muted));border-radius:10px;border-left:4px solid var(--accent,var(--cc-accent));margin-top:1rem;}
.pcalc-err[hidden]{display:none;}
.pcalc-edu{margin-top:2rem;max-width:640px;}
.pcalc-edu-title{font-size:1.25rem;font-weight:700;margin:0 0 0.75rem;color:var(--text-main,var(--cc-text-main));}
.pcalc-edu-sub{font-size:1.0625rem;font-weight:600;margin:1.25rem 0 0.5rem;color:var(--text-main,var(--cc-text-main));}
.pcalc-edu p{margin:0 0 0.75rem;font-size:0.9375rem;line-height:1.6;color:var(--text-main,var(--cc-text-main));}
.pcalc-edu ul{margin:0 0 0.75rem;padding-left:1.25rem;}
.pcalc-edu li{margin-bottom:0.25rem;font-size:0.9375rem;line-height:1.5;color:var(--text-main,var(--cc-text-main));}
.pcalc-edu a{color:var(--primary,var(--cc-primary));font-weight:500;}