:root{--bg-app:#09090b;--bg-panel:#18181b;--bg-input:#27272a;--text-primary:#fafafa;--text-secondary:#a1a1aa;--text-muted:#71717a;--border-subtle:#3f3f46;--border-focus:#22d3ee80;--primary:#22d3ee;--primary-hover:#0891b2;--success:#10b981;--danger:#ef4444;--accent:var(--calc-color-math);--accent-glow:#22d3ee33;--bg-dark:var(--bg-app);--card-bg:var(--bg-panel);--cyan:#22d3ee;--purple:#a855f7}body{background-color:var(--bg-app);color:var(--text-primary);margin:0;padding:0;font-family:Inter,sans-serif;line-height:1.6}.calc-breadcrumb{color:var(--calc-text-muted);padding:10px 20px;font-size:.85rem}.calc-breadcrumb a{color:var(--text-secondary);text-decoration:none}.calc-breadcrumb a:hover{color:var(--primary)}.main-container{max-width:1300px;margin:0 auto;padding:0 20px 20px}.calc-title{text-align:center;letter-spacing:-.02em;margin:10px 0 4px;font-size:2rem;font-weight:800}.calc-subtitle{text-align:center;color:var(--text-secondary);margin:0 0 20px;font-size:1rem}.tab-nav{background:var(--bg-input);border:1px solid var(--border-subtle);border-radius:12px;gap:4px;margin-bottom:20px;padding:4px;display:flex}.tab-btn{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;border-radius:8px;flex:1;padding:8px 16px;font-size:.9rem;font-weight:600;transition:transform .25s,opacity .25s,color .2s,box-shadow .25s}.tab-btn.active{background:var(--primary);color:#000}.tab-btn:focus-visible{outline:2px solid var(--border-focus);outline-offset:2px}.tab-content{display:none}.tab-content.active{display:block}.preset-chips{flex-wrap:wrap;gap:6px;margin-bottom:14px;display:flex}.preset-chip{border:1px solid var(--border-subtle);color:var(--text-secondary);cursor:pointer;background:#ffffff0a;border-radius:20px;padding:5px 13px;font-family:inherit;font-size:.82rem;font-weight:600;transition:transform .25s,opacity .25s,color .2s,box-shadow 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16px}.hero-label{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.08em;margin-bottom:6px;font-size:.75rem;font-weight:700}.hero-value{color:#fff;letter-spacing:-.02em;word-break:break-all;margin-bottom:8px;font-size:2.4rem;font-weight:800;line-height:1.1}.hero-sub{color:var(--text-secondary);font-size:.9rem}.stat-grid{grid-template-columns:1fr 1fr;gap:10px;margin-top:16px;display:grid}.stat-card{border:1px solid var(--border-subtle);text-align:center;background:#ffffff08;border-radius:10px;padding:12px}.stat-card.s-mL{border-left:3px solid #22d3ee8c}.stat-card.s-gal{border-left:3px solid #a855f78c}.stat-card.s-cup{border-left:3px solid #10b9818c}.stat-card.s-floz{border-left:3px solid #f59e0b8c}.stat-card .s-label{color:var(--calc-text-muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:4px;font-size:.75rem}.stat-card .s-value{color:#fff;word-break:break-all;font-size:1rem;font-weight:700}.chart-wrap{background:#ffffff05;border:1px solid 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tr{cursor:pointer;transition:background .15s}.ref-table tbody tr:hover td{color:#fff;background:#22d3ee0f}.ref-table-hint{color:var(--calc-text-muted);margin-bottom:8px;font-size:.8rem;font-style:italic}.formula-box{background:var(--bg-input);border:1px solid var(--border-subtle);border-radius:10px;margin-bottom:12px;padding:14px 16px}.formula-box .f-title{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em;margin-bottom:6px;font-size:.8rem;font-weight:700}.formula-box .f-eq{color:var(--calc-cyan);font-family:Courier New,monospace;font-size:1rem}.ref-grid-visual{grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:.75rem;margin-top:1rem;display:grid}.ref-card-v{text-align:center;background:#22d3ee0f;border:1px solid #22d3ee2e;border-radius:10px;padding:.9rem 1rem}.ref-card-v .ref-icon{margin-bottom:.3rem;font-size:1.6rem;display:block}.ref-card-v 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td{color:#fff;background:#a855f70a}.qr-section{margin-bottom:2rem}.qr-section-title{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.07em;border-bottom:1px solid #ffffff12;margin-bottom:.5rem;padding-bottom:8px;font-size:.85rem;font-weight:700}.upgrade-wrap{max-width:900px;margin:0 auto;padding:0 20px;overflow-x:hidden}.u-section{margin:48px 0 0}.u-title{color:#fff;letter-spacing:-.01em;border-bottom:1px solid #ffffff12;margin:0 0 18px;padding-bottom:10px;font-size:1.3rem;font-weight:800}.ob-grid{grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:14px;display:grid}.ob-card{text-align:center;background:#22d3ee0a;border:1px solid #22d3ee26;border-radius:12px;padding:22px}.ob-num{color:var(--calc-cyan);margin-bottom:10px;font-family:Courier New,monospace;font-size:2rem;font-weight:900;line-height:1;display:block}.ob-card h3{color:#fff;margin:0 0 7px;font-size:.95rem;font-weight:700}.ob-card p{color:var(--calc-text-muted);margin:0;font-size:.85rem;line-height:1.6}.formula-pills2{flex-wrap:wrap;gap:10px;display:flex}.fp2{background:#a855f714;border:1px solid #a855f740;border-radius:10px;flex-direction:column;flex:180px;gap:5px;min-width:160px;padding:13px 16px;display:flex}.fp2-label{color:var(--purple);text-transform:uppercase;letter-spacing:.06em;font-size:.73rem;font-weight:700}.fp2-eq{color:#fff;font-family:Courier New,monospace;font-size:.96rem;font-weight:700}.fp2-desc{color:var(--calc-text-muted);margin:0;font-size:.8rem}.gloss-grid2{grid-template-columns:repeat(auto-fit,minmax(195px,1fr));gap:10px;margin:0;display:grid}.glossary-chip{background:#ffffff05;border:1px solid #ffffff12;border-radius:10px;padding:13px 14px}.glossary-chip dt{color:var(--calc-cyan);margin:0 0 4px;font-size:.85rem;font-weight:700;display:block}.glossary-chip 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10px;font-size:.78rem}}[data-theme=light]{--bg-app:#e8edf5;--bg-panel:#fff;--bg-input:#edf2f9;--text-primary:#0f172a;--text-secondary:#334155;--text-muted:#64748b;--border-subtle:#0000001f;--border-focus:#0891b2;--primary:#0891b2;--primary-hover:#0f766e;--success:#059669;--danger:#dc2626;--accent:var(--calc-color-math);--accent-glow:#0891b21f;--bg-dark:var(--bg-app);--card-bg:var(--bg-panel)}[data-theme=light] body{color:#0f172a;background-color:#e8edf5}[data-theme=light] .card{background:#fff;border-color:#0000001f;box-shadow:0 2px 8px #00000014}[data-theme=light] .input-card{border-left:3px solid #0891b2}[data-theme=light] .result-card{border-left:3px solid #7c3aed}[data-theme=light] .tab-btn{color:#334155}[data-theme=light] .tab-btn.active{color:#fff;background:#0891b2}[data-theme=light] .form-label{color:#475569}[data-theme=light] .section-label{color:#475569;border-color:#0000001a}[data-theme=light] .btn-secondary{color:#334155;background:#edf2f9;border-color:#00000026}[data-theme=light] .btn-secondary:hover{color:#0f172a;background:#e2e8f0;border-color:#0891b2}[data-theme=light] .hero-value{color:#0f172a}[data-theme=light] .hero-label{color:#475569}[data-theme=light] .hero-sub{color:#64748b}[data-theme=light] .stat-card{background:#f0f4f9;border-color:#0000001a;box-shadow:0 1px 3px #0000000f}[data-theme=light] .stat-card.s-mL{border-left:3px solid #0891b2}[data-theme=light] .stat-card.s-gal{border-left:3px solid #7c3aed}[data-theme=light] .stat-card.s-cup{border-left:3px solid #059669}[data-theme=light] .stat-card.s-floz{border-left:3px solid #0891b2}[data-theme=light] .stat-card .s-label{color:#64748b}[data-theme=light] .stat-card .s-value{color:#0f172a}[data-theme=light] .chart-wrap{background:#f0f4f9;border-color:#0000001a}[data-theme=light] .chart-wrap h3{color:#64748b}[data-theme=light] .act-btn{color:#475569;background:#edf2f9;border-color:#0000001f}[data-theme=light] 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.fp2-eq{color:#0f172a}[data-theme=light] .fp2-desc{color:#475569}[data-theme=light] .glossary-chip{background:#f0f4f9;border-color:#0000001a}[data-theme=light] .glossary-chip dt{color:#0891b2}[data-theme=light] .glossary-chip dd{color:#475569}[data-theme=light] .act-btn2{color:#475569;background:#edf2f9;border-color:#0000001f}[data-theme=light] .act-btn2:hover{color:#0891b2;background:#0891b214;border-color:#0891b2}[data-theme=light] .rel-card2{color:#475569;background:#f0f4f9;border-color:#0000001a}[data-theme=light] .rel-card2:hover{color:#0891b2;background:#0891b20f;border-color:#0891b2}[data-theme=light] .article-body2{color:#475569}[data-theme=light] .article-body2 h3{color:#0f172a}[data-theme=light] .faq-item-enhanced{background:#fff;border-color:#0000001a;box-shadow:0 1px 4px #0000000f}[data-theme=light] .faq-q{color:#0f172a}[data-theme=light] .faq-q:after{color:#0891b2}[data-theme=light] .faq-a{color:#475569}[data-theme=light] .faq-section-extra .faq-q{color:#0f172a}