:root{--bg-dark:#050510;--card:#0d0d1f;--input-bg:#111827;--text-main:#fff;--text-dim:#88a;--text-muted:#666;--cyan:#22d3ee;--purple:#a855f7;--border:#ffffff12;--border-mid:#ffffff1f;--accent:var(--calc-color-math);--accent-glow:#22d3ee1f;--font-mono:"JetBrains Mono", "Courier New", monospace}body{background:var(--calc-bg-page);color:var(--calc-text-primary);margin:0;padding:0;font-family:Inter,Plus Jakarta Sans,sans-serif;line-height:1.6}.main-container{max-width:1300px;margin:0 auto;padding:0 20px 24px}.calc-title{text-align:center;letter-spacing:-.02em;color:var(--calc-text-primary);margin:14px 0 4px;font-size:2rem;font-weight:800}.calc-subtitle{text-align:center;color:var(--calc-text-dim);margin:0 0 20px;font-size:1rem}.tab-nav{background:var(--input-bg);border:1px solid var(--calc-border-default);border-radius:12px;gap:4px;margin-bottom:20px;padding:4px;display:flex}.tab-btn{color:var(--calc-text-dim);cursor:pointer;background:0 0;border:none;border-radius:8px;flex:1;padding:8px 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.f-title{color:var(--calc-text-dim);text-transform:uppercase;letter-spacing:.05em;margin-bottom:6px;font-size:.75rem;font-weight:700}.formula-box .f-eq{font-family:var(--font-mono);color:var(--calc-cyan);font-size:.95rem}.fp-row{flex-wrap:wrap;gap:8px;margin-bottom:20px;display:flex}.fp{background:#a855f714;border:1px solid #a855f738;border-radius:8px;align-items:baseline;gap:8px;padding:9px 14px;display:inline-flex}.fp-eq{font-family:var(--font-mono);color:var(--purple);font-size:.85rem}.fp-desc{color:var(--calc-text-muted);font-size:.77rem}.ref-grid-visual{grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:10px;margin-top:10px;display:grid}.ref-card-v{text-align:center;background:#22d3ee0a;border:1px solid #22d3ee24;border-radius:10px;padding:14px}.ref-card-v .ref-icon{margin-bottom:6px;font-size:1.7rem;display:block}.ref-card-v .ref-label{color:var(--calc-text-muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:4px;font-size:.72rem;display:block}.ref-card-v .ref-val{color:var(--calc-cyan);font-size:.9rem;font-weight:700}.conv-table-wrap{margin-top:10px;overflow-x:auto}.conv-table{border-collapse:collapse;width:100%;font-size:.86rem}.conv-table th{color:var(--calc-cyan);text-align:left;background:#22d3ee17;border-bottom:1px solid #22d3ee2e;padding:8px 10px;font-weight:600}.conv-table td{border-bottom:1px solid var(--calc-border-default);color:var(--calc-text-dim);cursor:pointer;padding:7px 10px;transition:background .15s}.conv-table tr:hover td{color:var(--calc-text-primary);background:#22d3ee0d}.u-section{margin-bottom:28px}.u-title{color:var(--calc-text-primary);letter-spacing:-.01em;border-bottom:1px solid var(--calc-border-default);margin:0 0 14px;padding-bottom:8px;font-size:1.1rem;font-weight:800}.toast{background:var(--calc-bg-card);border:1px solid var(--border-mid);color:var(--calc-text-primary);opacity:0;pointer-events:none;border-radius:10px;align-items:center;gap:8px;min-width:160px;padding:10px 16px;font-size:.85rem;transition:opacity .25s,transform .25s;display:flex;transform:translate(20px);box-shadow:0 4px 20px #0006}.toast.show{opacity:1;transform:translate(0)}.toast-success{border-left:3px solid #10b981}.toast-warn{border-left:3px solid #f59e0b}.toast-error{border-left:3px solid #ef4444}.calc-breadcrumb{color:var(--calc-text-muted);padding:10px 20px;font-size:.82rem}.calc-breadcrumb a{color:var(--calc-text-dim);text-decoration:none}.calc-breadcrumb a:hover{color:var(--calc-cyan)}.faq-list{flex-direction:column;display:flex}.faq-item-enhanced{border-bottom:1px solid var(--calc-border-default)}.faq-item__question{cursor:pointer;color:var(--calc-text-primary);user-select:none;justify-content:space-between;align-items:center;padding:14px 4px;font-size:.9rem;font-weight:600;list-style:none;transition:color 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