:root{--bg-dark:#050510;--card:#0d0d1f;--input-bg:#111128;--cyan:#00f3ff;--teal:#00d1c1;--purple:#bc13fe;--amber:#f59e0b;--green:#10b981;--red:#f43f5e;--text-main:#fff;--text-dim:#88a;--text-muted:#557;--border:#ffffff14;--radius:12px;--accent:#00d1c1}*,:before,:after{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg-dark);color:var(--text-main);min-height:100vh;font-family:Inter,sans-serif;line-height:1.5}a{color:inherit;text-decoration:none}.calc-breadcrumb{color:var(--text-muted);padding:10px 24px;font-size:.79rem}.calc-breadcrumb a{color:var(--text-dim)}.calc-breadcrumb a:hover{color:var(--cyan)}.main-container{max-width:1200px;margin:0 auto;padding:24px}.calc-title{margin-bottom:6px;font-size:2rem;font-weight:800}.calc-subtitle{color:var(--text-dim);margin-bottom:24px;font-size:.95rem}.outer-tab-nav{border-bottom:1px solid var(--border);gap:4px;margin-bottom:24px;display:flex}.outer-tab-btn{color:var(--text-dim);cursor:pointer;background:0 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auto;display:block}.svg-shape-fill{fill:#00d1c112;stroke:var(--teal);stroke-width:1.5px}.svg-label{fill:var(--text-dim);text-anchor:middle;font-family:Inter,sans-serif;font-size:11px}.svg-label-side{fill:var(--text-dim);text-anchor:end;font-family:Inter,sans-serif;font-size:11px}.hero-card{border-radius:var(--radius);text-align:center;background:linear-gradient(135deg,#00d1c11a,#00f3ff0a);border:1px solid #00d1c140;margin-bottom:16px;padding:24px 20px;box-shadow:0 0 32px #00d1c11f}.hero-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.1em;margin-bottom:8px;font-size:.72rem}.hero-value{color:var(--teal);font-size:2.8rem;font-weight:900;line-height:1}.hero-unit{color:var(--text-dim);margin-left:4px;font-size:1.1rem;font-weight:600}.hero-sub{color:var(--text-dim);margin-top:6px;font-size:.87rem}.stat-grid-8{grid-template-columns:repeat(4,1fr);gap:8px;margin-bottom:16px;display:grid}@media 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th{color:var(--teal);text-align:left;border-bottom:1px solid var(--border);background:#00d1c114;padding:10px 14px;font-weight:600}.data-table td{color:var(--text-dim);border-bottom:1px solid #ffffff0a;padding:9px 14px}.data-table tr:hover td{background:#ffffff05}.toast{z-index:9999;border:1px solid var(--border);color:var(--text-main);opacity:0;pointer-events:none;background:#0d0d1f;border-radius:10px;max-width:320px;padding:12px 18px;font-size:.88rem;transition:all .28s;position:fixed;bottom:24px;right:24px;transform:translateY(10px);box-shadow:0 4px 24px #00000080}.toast.toast-show{opacity:1;transform:translateY(0)}.toast-success{border-left:3px solid var(--green)}.toast-warn{border-left:3px solid var(--amber)}.toast-error{border-left:3px solid var(--red)}.page-sections-outer{max-width:1200px;margin:0 auto;padding:0 24px 48px}.edu-section{margin-top:48px}.edu-section-title{color:var(--text-main);margin-bottom:20px;font-size:1.3rem;font-weight:800}.howto-grid{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;display:grid}.howto-card{border-radius:var(--radius);background:#00f3ff0a;border:1px solid #00f3ff26;padding:18px}.howto-num{color:var(--teal);opacity:.4;margin-bottom:8px;font-size:1.8rem;font-weight:900;line-height:1}.howto-card h3{color:var(--text-main);margin-bottom:6px;font-size:.92rem;font-weight:700}.howto-card p{color:var(--text-dim);font-size:.84rem;line-height:1.6}.formula-pills2{flex-wrap:wrap;gap:10px;display:flex}.fp2{background:#bc13fe14;border:1px solid #bc13fe40;border-radius:10px;flex:200px;min-width:160px;padding:13px 16px}.fp2-label{color:var(--purple);text-transform:uppercase;letter-spacing:.06em;margin-bottom:5px;font-size:.72rem;font-weight:700}.fp2-eq{color:var(--text-main);margin-bottom:4px;font-family:Courier New,monospace;font-size:.94rem;font-weight:700}.fp2-desc{color:var(--text-dim);font-size:.8rem}.edu-table-wrap{overflow-x:auto}.gloss-grid{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:10px;display:grid}.gloss-item{border:1px solid var(--border);border-left:3px solid var(--cyan);background:#ffffff05;border-radius:0 8px 8px 0;padding:12px 14px}.gloss-item dt{color:var(--cyan);margin-bottom:4px;font-size:.88rem;font-weight:700}.gloss-item dd{color:var(--text-dim);font-size:.82rem;line-height:1.55}.examples-grid{grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:14px;display:grid}.example-card{border-radius:var(--radius);background:#ffffff05;border:1px solid #00f3ff26;padding:18px}.example-badge{color:var(--cyan);text-transform:uppercase;letter-spacing:.05em;background:#00f3ff1a;border-radius:20px;margin-bottom:8px;padding:2px 9px;font-size:.7rem;font-weight:700;display:inline-block}.example-card h3{color:var(--text-main);margin-bottom:6px;font-size:.92rem;font-weight:700}.example-card p{color:var(--text-dim);margin-bottom:4px;font-size:.82rem;line-height:1.6}.example-result{color:var(--cyan);margin-top:6px;font-size:.85rem;font-weight:600}.faq-list{flex-direction:column;display:flex}.faq-item{border-bottom:1px solid #ffffff0f}.faq-item__question{cursor:pointer;color:var(--text-main);user-select:none;justify-content:space-between;align-items:center;padding:14px 4px;font-size:.9rem;font-weight:600;list-style:none;transition:color .2s;display:flex}.faq-item__question::-webkit-details-marker{display:none}.faq-item__question:after{content:"+";color:var(--text-dim);flex-shrink:0;margin-left:16px;font-family:Courier New,monospace;font-size:1.1rem;transition:color .2s}.faq-item[open] .faq-item__question:after{content:"−";color:var(--teal)}.faq-item__question:hover{color:var(--teal)}.faq-item__answer{color:var(--text-dim);padding:0 4px 14px;font-size:.85rem;line-height:1.75}.related-grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:10px;display:grid}.related-card{border:1px solid var(--border);color:var(--text-dim);background:#ffffff05;border-radius:10px;padding:12px 14px;font-size:.87rem;transition:all .2s;display:block}.related-card:hover{border-color:var(--teal);color:var(--text-main);background:#00d1c10d}[data-theme=light]{--bg-dark:#e8edf5;--card:#fff;--input-bg:#f0f4f9;--cyan:#0e7490;--teal:#0f766e;--purple:#7c3aed;--amber:#a16207;--green:#065f46;--red:#b91c1c;--text-main:#0f172a;--text-dim:#334155;--text-muted:#64748b;--border:#0000001a;--accent:#0f766e}[data-theme=light] body{background:var(--bg-dark);color:var(--text-main)}[data-theme=light] .card{background:#fff;border-color:#0000001a;box-shadow:0 2px 8px #0000000f}[data-theme=light] .input-card{border-left-color:#0e7490}[data-theme=light] .result-card{border-left-color:#7c3aed}[data-theme=light] .form-input,[data-theme=light] .form-select{color:#0f172a;background:#fff;border-color:#00000026}[data-theme=light] .form-input:focus,[data-theme=light] .form-select:focus{border-color:#0f766e}[data-theme=light] .form-select option{color:#0f172a;background:#fff}[data-theme=light] .chip{color:#334155;background:#f0f4f9;border-color:#0000001f}[data-theme=light] .chip:hover{color:#0f766e;border-color:#0f766e}[data-theme=light] .chip.active{color:#0f766e;background:#0f766e1a;border-color:#0f766e}[data-theme=light] .delivery-row{background:#f0f4f9;border-color:#0000001f}[data-theme=light] .shape-preview{background:#00000008;border-color:#0f766e33}[data-theme=light] .svg-shape-fill{fill:#0f766e14;stroke:#0f766e}[data-theme=light] .svg-label,[data-theme=light] .svg-label-side{fill:#64748b}[data-theme=light] .hero-card{background:linear-gradient(135deg,#0f766e14,#0e74900a);border-color:#0f766e33;box-shadow:0 0 20px #0f766e14}[data-theme=light] .hero-value{color:#0f766e}[data-theme=light] 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