.bpc-scope{--navy:#002868;--navy-dark:#00183F;--navy-mid:#003580;--red:#BF0A30;--red-h:#9B0826;--green:#00875A;--green-h:#006644;--green-light:#e6f7f0;--aqua:#0d9488;--aqua-dark:#0f766e;--aqua-light:#d5f5f0;--purple:#7c3aed;--purple-light:#f3edff;--amber:#d97706;--amber-light:#fef3e2;--white:#fff;--charcoal:#1D1D1F;--gray:#5F6368;--border:#E0E4E8;--bg:#F7F9FC;--bg2:#EEF2F8;--gold:#C8922A;--sh-sm:0 1px 4px rgba(0,40,104,.08);--sh-md:0 4px 20px rgba(0,40,104,.12);--sh-lg:0 8px 40px rgba(0,40,104,.18);font-family:'Inter',sans-serif;color:var(--charcoal);line-height:1.6}.bpc-scope *,.bpc-scope *::before,.bpc-scope *::after{box-sizing:border-box;margin:0;padding:0}.bpc-scope a{text-decoration:none;color:inherit}@keyframes lsiBlink{0%,100%{opacity:1}50%{opacity:.35}}@keyframes lsiFade{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.bpc-hero{background:linear-gradient(135deg,var(--navy-dark) 0%,var(--navy) 50%,#0a3b6e 100%);position:relative;overflow:hidden;border-radius:16px;padding:44px 48px 40px;margin-bottom:32px}.bpc-hero::before{content:'';position:absolute;inset:0;background:radial-gradient(ellipse 55% 65% at 88% 35%,rgba(8,145,178,.24) 0%,transparent 60%),radial-gradient(ellipse 40% 50% at 8% 85%,rgba(191,10,48,.12) 0%,transparent 50%);pointer-events:none}.bpc-hero::after{content:'';position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.025) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.025) 1px,transparent 1px);background-size:48px 48px;pointer-events:none}.bpc-hero-in{position:relative;z-index:2}.bpc-badge{display:inline-flex;align-items:center;gap:7px;background:rgba(8,145,178,.18);border:1px solid rgba(8,145,178,.38);color:#a5e9f7;font-size:11px;font-weight:700;letter-spacing:.6px;text-transform:uppercase;padding:4px 13px;border-radius:20px;margin-bottom:16px}.bpc-badge .dot{width:6px;height:6px;background:var(--aqua);border-radius:50%;animation:lsiBlink 1.4s infinite}.bpc-hero h1{font-family:'Montserrat',sans-serif;font-weight:800;font-size:clamp(26px,3.6vw,40px);color:var(--white);line-height:1.16;letter-spacing:-.6px;margin-bottom:14px}.bpc-hero h1 .accent{color:transparent;background:linear-gradient(90deg,#a5e9f7,var(--aqua));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.bpc-hero-sub{font-size:16px;color:rgba(255,255,255,.76);line-height:1.7;max-width:660px;margin-bottom:22px}.bpc-pills{display:flex;flex-wrap:wrap;gap:7px}.bpc-pill{background:rgba(255,255,255,.09);border:1px solid rgba(255,255,255,.16);color:rgba(255,255,255,.82);font-size:12px;font-weight:500;padding:5px 13px;border-radius:20px}.bpc-calc{background:var(--white);border:1px solid var(--border);border-radius:16px;box-shadow:var(--sh-md);overflow:hidden;margin-bottom:36px}.bpc-calc-head{background:var(--bg);border-bottom:1px solid var(--border);padding:20px 26px}.bpc-calc-head h2{font-family:'Montserrat',sans-serif;font-size:19px;font-weight:800;color:var(--navy);margin-bottom:3px}.bpc-calc-head p{font-size:13.5px;color:var(--gray)}.bpc-grid{display:grid;grid-template-columns:1fr 1fr;gap:0}.bpc-inputs{padding:26px;border-right:1px solid var(--border)}.bpc-output{padding:26px;background:var(--bg)}.bpc-field{margin-bottom:16px}.bpc-field label{display:block;font-size:13px;font-weight:700;color:var(--navy-mid);margin-bottom:6px}.bpc-field label .hint{font-weight:500;color:var(--gray);font-size:12px}.bpc-inwrap{display:flex;align-items:stretch;border:1.5px solid var(--border);border-radius:8px;overflow:hidden;transition:border-color .18s,box-shadow .18s;background:var(--white)}.bpc-inwrap:focus-within{border-color:var(--aqua);box-shadow:0 0 0 3px rgba(8,145,178,.12)}.bpc-pre,.bpc-suf{display:flex;align-items:center;padding:0 12px;background:var(--bg2);color:var(--gray);font-size:13px;font-weight:600;white-space:nowrap}.bpc-pre{border-right:1px solid var(--border)}.bpc-suf{border-left:1px solid var(--border)}.bpc-inwrap input,.bpc-inwrap select{flex:1;border:0;outline:0;padding:11px 12px;font-size:15px;font-family:'Inter',sans-serif;color:var(--charcoal);background:transparent;width:100%;min-width:0}.bpc-inwrap select{cursor:pointer}.bpc-row2{display:grid;grid-template-columns:1fr 1fr;gap:12px}.bpc-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}.bpc-btn{font-family:'Montserrat',sans-serif;font-weight:700;font-size:14px;padding:12px 22px;border-radius:8px;border:0;cursor:pointer;transition:all .18s;display:inline-flex;align-items:center;gap:7px}.bpc-btn-primary{background:var(--navy);color:var(--white);flex:1;justify-content:center;min-width:150px}.bpc-btn-primary:hover{background:var(--navy-mid);transform:translateY(-1px);box-shadow:var(--sh-md)}.bpc-btn-sec{background:var(--white);color:var(--navy);border:1.5px solid var(--border)}.bpc-btn-sec:hover{border-color:var(--navy);background:var(--bg)}.bpc-btn-wa{background:#25D366;color:var(--white)}.bpc-btn-wa:hover{background:#1da851;transform:translateY(-1px)}.bpc-btn[hidden]{display:none}.bpc-result-empty{text-align:center;padding:30px 16px;color:var(--gray)}.bpc-result-empty .ic{font-size:38px;margin-bottom:12px;opacity:.5}.bpc-result-empty p{font-size:14px;line-height:1.6}.bpc-result{animation:lsiFade .4s ease}.bpc-verdict{border-radius:12px;padding:22px;text-align:center;margin-bottom:18px;color:var(--white)}.bpc-verdict.corrosive{background:linear-gradient(135deg,var(--red),var(--red-h))}.bpc-verdict.balanced{background:linear-gradient(135deg,var(--green),var(--green-h))}.bpc-verdict.scaling{background:linear-gradient(135deg,var(--purple),#5b21b6)}.bpc-verdict-label{font-size:11px;font-weight:700;letter-spacing:1px;text-transform:uppercase;opacity:.85;margin-bottom:6px}.bpc-verdict-num{font-family:'Montserrat',sans-serif;font-size:46px;font-weight:800;line-height:1;letter-spacing:-1px}.bpc-verdict-word{font-family:'Montserrat',sans-serif;font-size:17px;font-weight:700;margin-top:6px}.bpc-verdict-note{font-size:13px;opacity:.9;margin-top:8px;line-height:1.5}.bpc-chart-wrap{background:var(--white);border:1px solid var(--border);border-radius:10px;padding:16px;margin-bottom:16px}.bpc-cw-t{font-family:'Montserrat',sans-serif;font-size:13px;font-weight:700;color:var(--navy);margin-bottom:10px;text-align:center}.bpc-canvas-box{position:relative;height:150px}.bpc-break{background:var(--white);border:1px solid var(--border);border-radius:10px;overflow:hidden;margin-bottom:16px}.bpc-bk-t{font-family:'Montserrat',sans-serif;font-size:13px;font-weight:700;color:var(--navy);padding:12px 16px;background:var(--bg);border-bottom:1px solid var(--border)}.bpc-break table{width:100%;border-collapse:collapse;font-size:13px}.bpc-break td{padding:9px 16px;border-bottom:1px solid var(--border)}.bpc-break tr:last-child td{border-bottom:0}.bpc-break td:first-child{color:var(--gray)}.bpc-break td:last-child{text-align:right;font-weight:700;color:var(--charcoal);font-variant-numeric:tabular-nums}.bpc-break tr.total td{background:var(--navy);color:var(--white);font-weight:800}.bpc-break tr.total td:first-child{color:var(--white)}.bpc-fix{border-radius:10px;padding:14px 16px;font-size:13.5px;line-height:1.6}.bpc-fix.show-corrosive{background:var(--red-h);background:rgba(191,10,48,.07);border:1px solid rgba(191,10,48,.22);color:var(--charcoal)}.bpc-fix.show-balanced{background:var(--green-light);border:1px solid rgba(0,135,90,.25);color:var(--charcoal)}.bpc-fix.show-scaling{background:var(--purple-light);border:1px solid rgba(124,58,237,.22);color:var(--charcoal)}.bpc-fix strong{color:var(--navy)}.bpc-error{background:rgba(191,10,48,.08);border:1px solid rgba(191,10,48,.3);color:var(--red-h);border-radius:8px;padding:11px 14px;font-size:13px;margin-top:14px}.bpc-error[hidden]{display:none}.bpc-sec{margin:40px 0}.bpc-sec h2{font-family:'Montserrat',sans-serif;font-size:clamp(22px,3vw,30px);font-weight:800;color:var(--navy);line-height:1.2;margin-bottom:14px}.bpc-sec h3{font-family:'Montserrat',sans-serif;font-size:19px;font-weight:800;color:var(--navy-mid);margin:24px 0 10px}.bpc-sec p{font-size:15.5px;color:var(--charcoal);line-height:1.8;margin-bottom:15px;max-width:820px}.bpc-sec ul,.bpc-sec ol{margin:0 0 15px 22px;max-width:820px}.bpc-sec li{font-size:15.5px;color:var(--charcoal);line-height:1.75;margin-bottom:7px}.bpc-sec a{color:var(--navy);font-weight:600;border-bottom:1px solid var(--border)}.bpc-sec a:hover{border-color:var(--navy)}.bpc-lead{font-size:17px!important;color:var(--gray)!important;line-height:1.75!important}.bpc-tbl-wrap{overflow-x:auto;border:1px solid var(--border);border-radius:12px;box-shadow:var(--sh-sm);margin:18px 0}.bpc-dtbl{width:100%;border-collapse:collapse;font-size:13.5px;min-width:520px}.bpc-dtbl thead th{background:var(--navy);color:var(--white);font-family:'Montserrat',sans-serif;font-weight:700;text-align:left;padding:12px 15px;font-size:12.5px}.bpc-dtbl tbody td{padding:11px 15px;border-bottom:1px solid var(--border);color:var(--charcoal)}.bpc-dtbl tbody tr:nth-child(even){background:var(--bg)}.bpc-dtbl tbody tr:hover{background:var(--aqua-light)}.bpc-dtbl .c-cor{color:var(--red);font-weight:700}.bpc-dtbl .c-bal{color:var(--green);font-weight:700}.bpc-dtbl .c-sca{color:var(--purple);font-weight:700}.bpc-box{background:var(--aqua-light);border-left:4px solid var(--aqua);border-radius:8px;padding:18px 20px;margin:18px 0}.bpc-box.gov{background:var(--bg2);border-left-color:var(--navy)}.bpc-box-t{font-family:'Montserrat',sans-serif;font-size:15px;font-weight:800;color:var(--navy);margin-bottom:7px}.bpc-box p{font-size:14px;color:var(--charcoal);line-height:1.7;margin-bottom:0;max-width:none}.bpc-eg{background:var(--white);border:1px solid var(--border);border-radius:12px;padding:22px 24px;margin-bottom:16px;box-shadow:var(--sh-sm)}.bpc-eg-tag{display:inline-block;font-size:11px;font-weight:700;letter-spacing:.5px;text-transform:uppercase;color:var(--aqua-dark);background:var(--aqua-light);padding:3px 11px;border-radius:20px;margin-bottom:10px}.bpc-eg h3{margin-top:0}.bpc-tips{display:grid;grid-template-columns:1fr 1fr;gap:14px}.bpc-tip{background:var(--white);border:1px solid var(--border);border-radius:10px;padding:18px 20px;display:flex;gap:13px}.bpc-tip-n{flex-shrink:0;width:30px;height:30px;border-radius:8px;background:var(--navy);color:var(--white);font-family:'Montserrat',sans-serif;font-weight:800;font-size:14px;display:flex;align-items:center;justify-content:center}.bpc-tip-t{font-family:'Montserrat',sans-serif;font-size:14.5px;font-weight:700;color:var(--navy);margin-bottom:5px}.bpc-tip-b p{font-size:13.5px;color:var(--gray);line-height:1.65;margin:0;max-width:none}.bpc-qref{background:var(--navy);border-radius:12px;padding:26px 28px;color:var(--white);margin:18px 0}.bpc-qref h3{color:var(--white);margin-top:0}.bpc-qref table{width:100%;border-collapse:collapse;font-size:14px;margin-top:12px}.bpc-qref td{padding:9px 0;border-bottom:1px solid rgba(255,255,255,.14)}.bpc-qref td:first-child{color:rgba(255,255,255,.7)}.bpc-qref td:last-child{text-align:right;font-weight:700}.bpc-qref tr:last-child td{border-bottom:0}.bpc-faq-item{border:1.5px solid var(--border);border-radius:9px;overflow:hidden;margin-bottom:9px}.bpc-faq-q{display:flex;justify-content:space-between;align-items:center;padding:15px 18px;cursor:pointer;gap:12px;font-family:'Montserrat',sans-serif;font-size:14.5px;font-weight:700;color:var(--navy);user-select:none;transition:background .18s}.bpc-faq-q:hover{background:var(--bg)}.bpc-faq-item.open .bpc-faq-q{background:var(--navy);color:var(--white)}.bpc-faq-ic{flex-shrink:0;width:22px;height:22px;border:2px solid var(--border);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:15px;transition:all .18s}.bpc-faq-item.open .bpc-faq-ic{background:var(--white);border-color:var(--white);color:var(--navy)}.bpc-faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease,padding .3s ease;font-size:14.5px;color:var(--gray);line-height:1.75;padding:0 18px}.bpc-faq-item.open .bpc-faq-a{max-height:460px;padding:15px 18px 18px}.bpc-faq-a a{color:var(--navy);font-weight:600}.bpc-rel-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:13px}.bpc-rc{background:var(--white);border:1.5px solid var(--border);border-radius:11px;padding:18px;transition:all .2s;display:flex;flex-direction:column}.bpc-rc:hover{transform:translateY(-3px);box-shadow:var(--sh-md);border-color:var(--navy)}.bpc-rc-ic{width:40px;height:40px;border-radius:9px;background:var(--aqua-light);display:flex;align-items:center;justify-content:center;font-size:19px;margin-bottom:10px}.bpc-rc-n{font-family:'Montserrat',sans-serif;font-size:13.5px;font-weight:700;color:var(--navy-mid);line-height:1.3;margin-bottom:5px;flex:1}.bpc-rc-d{font-size:12px;color:var(--gray);line-height:1.55}.bpc-legal{background:var(--bg);border:1px solid var(--border);border-radius:10px;padding:22px 24px;margin-top:30px}.bpc-legal h3{font-family:'Montserrat',sans-serif;font-size:15px;font-weight:800;color:var(--navy);margin-bottom:8px}.bpc-legal p{font-size:12.5px;color:var(--gray);line-height:1.7;margin-bottom:10px;max-width:none}.bpc-legal p:last-child{margin-bottom:0}.bpc-legal a{color:var(--navy);font-weight:600}@media (max-width:768px){.bpc-hero{padding:32px 22px 30px}.bpc-grid{grid-template-columns:1fr}.bpc-inputs{border-right:0;border-bottom:1px solid var(--border)}.bpc-tips{grid-template-columns:1fr}.bpc-rel-grid{grid-template-columns:1fr 1fr}.bpc-btn-primary{min-width:100%}}@media (max-width:440px){.bpc-rel-grid{grid-template-columns:1fr}.bpc-row2{grid-template-columns:1fr}.bpc-verdict-num{font-size:38px}}.bpc-qref-t{font-family:'Montserrat',sans-serif;font-size:19px;font-weight:800;color:var(--white);margin-bottom:4px}.bpc-legal-t{font-family:'Montserrat',sans-serif;font-size:15px;font-weight:800;color:var(--navy);margin-bottom:8px}