:root{--bg-dark:#050510;--bg-card:#ffffff08;--bg-input:#ffffff0f;--text-main:#fff;--text-dim:#88a;--text-muted:#666;--cyan:#22d3ee;--purple:#a855f7;--border:#ffffff14;--border-focus:#22d3ee80;--accent:var(--calc-color-math);--accent-glow:#22d3ee26;--font-mono:"JetBrains Mono", "Courier New", monospace;--bg-app:#050510;--bg-panel:#ffffff0a;--text-primary:#fff;--text-secondary:#88a;--border-subtle:#ffffff14;--primary:#22d3ee;--primary-hover:#22d3eecc;--success:#10b981;--danger:#ef4444}body{background-color:var(--calc-bg-page);color:var(--calc-text-primary);margin:0;padding:0;font-family:Inter,sans-serif;line-height:1.6}.main-container{max-width:1300px;margin:0 auto;padding:0 20px 20px}.card{background:var(--bg-panel);border:1px solid var(--border-subtle);box-sizing:border-box;border-radius:16px;padding:24px}input[type=number]::-webkit-outer-spin-button,input[type=number]::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}input[type=number]{-moz-appearance:textfield}.hidden{display:none}.page-header{text-align:center;padding:24px 0 8px}.breadcrumb{color:var(--calc-text-muted);margin-bottom:8px;font-size:.8rem}.breadcrumb a{color:var(--calc-text-muted);text-decoration:none}.breadcrumb a:hover{color:var(--calc-cyan)}h1.page-title{color:#fff;margin:0 0 4px;font-size:1.8rem;font-weight:800}.page-sub{color:var(--calc-text-dim);margin:0;font-size:.95rem}.tab-nav{gap:6px;max-width:900px;margin:0 auto;padding:18px 0 0;display:flex}.tab-btn{border:1px solid var(--border-subtle);color:var(--calc-text-dim);cursor:pointer;background:#ffffff0a;border-radius:8px;padding:9px 20px;font-family:inherit;font-size:.9rem;font-weight:600;transition:all 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(width<=700px){.calc-layout{grid-template-columns:1fr}}.input-card{border-left:3px solid var(--calc-cyan)}.result-card{border-left:3px solid var(--purple)}.card-header{color:var(--calc-text-primary);border-bottom:1px solid var(--border-subtle);text-transform:uppercase;letter-spacing:.05em;margin-bottom:20px;padding-bottom:15px;font-size:.8rem;font-weight:700}.form-group{margin-bottom:14px}.form-group label{color:var(--calc-text-dim);text-transform:uppercase;letter-spacing:.05em;margin-bottom:6px;font-size:.82rem;font-weight:600;display:block}.hero-result{text-align:center;padding:20px 0 16px}.hero-label{text-transform:uppercase;letter-spacing:.08em;color:var(--calc-text-dim);margin-bottom:6px;font-size:.78rem;font-weight:700}.hero-value{color:#fff;letter-spacing:-.02em;font-size:2.4rem;font-weight:800;line-height:1.1}.hero-sub{color:var(--calc-text-muted);margin-top:6px;font-size:.85rem}.stat-grid{grid-template-columns:1fr 1fr;gap:10px;margin-top:14px;display:grid}.stat-card{background:#22d3ee0d;border:1px solid #22d3ee26;border-radius:10px;padding:12px}.stat-label{text-transform:uppercase;letter-spacing:.05em;color:var(--calc-text-dim);margin-bottom:4px;font-size:.75rem;font-weight:600}.stat-value{color:#fff;font-size:1.1rem;font-weight:700}.alert-stack{margin-top:12px}.alert{border-radius:8px;margin-bottom:6px;padding:10px 14px;font-size:.87rem;font-weight:500}.alert-info{color:var(--calc-cyan);font-family:var(--font-mono);background:#22d3ee14;border:1px solid #22d3ee40}.alert-danger{color:#fca5a5;background:#ef444414;border:1px solid #ef444440}.interp-card{background:#a855f70f;border:1px solid #a855f738;border-radius:10px;margin-top:14px;padding:14px 16px}.interp-label{text-transform:uppercase;letter-spacing:.06em;color:var(--purple);margin-bottom:6px;font-size:.72rem;font-weight:700}.interp-text{color:var(--calc-text-dim);margin:0;font-size:.88rem;line-height:1.6}.action-bar{flex-wrap:wrap;gap:10px;margin-top:14px;display:flex}.act-btn{color:var(--calc-text-dim);cursor:pointer;background:#ffffff0a;border:1px solid #ffffff1a;border-radius:8px;padding:8px 16px;font-family:inherit;font-size:.84rem;font-weight:600;transition:all .2s}.act-btn:hover{color:var(--calc-cyan);background:#22d3ee14;border-color:#22d3ee4d}.geo-svg-wrap{background:#0000004d;border:1px solid #22d3ee33;border-radius:12px;flex-direction:column;align-items:center;gap:.8rem;margin:1.2rem 0 0;padding:1rem;display:flex}.geo-svg-wrap svg{max-width:100%;height:auto}.geo-steps{box-sizing:border-box;background:#a855f712;border:1px solid #a855f740;border-radius:10px;width:100%;padding:1rem 1.2rem}.geo-steps h4{color:var(--purple);text-transform:uppercase;letter-spacing:.05em;margin:0 0 .6rem;font-size:.88rem}.geo-step{color:#ccc;font-size:.85rem;line-height:1.6;font-family:var(--font-mono);margin-bottom:.3rem}.geo-step strong{color:var(--calc-cyan)}.formula-table{max-width:900px;margin:0 auto}.formula-section-title{color:var(--text-main);margin-bottom:14px;font-size:1.1rem}.formula-table table{border-collapse:collapse;width:100%;margin-bottom:20px;font-size:.9rem}.formula-table th{color:var(--calc-text-primary);text-align:left;text-transform:uppercase;background:#22d3ee1a;padding:10px 12px;font-size:.8rem}.formula-table td{border-bottom:1px solid var(--border-subtle);color:var(--calc-text-dim);padding:10px 12px}.formula-table td:first-child{color:#fff;font-weight:600}.formula-table code{color:var(--calc-cyan);font-family:var(--font-mono);background:#22d3ee1a;border-radius:4px;padding:2px 6px;font-size:.82em}.unit-conv-grid{grid-template-columns:1fr 1fr;align-items:start;gap:20px;max-width:900px;margin:0 auto;display:grid}@media (width<=600px){.unit-conv-grid{grid-template-columns:1fr}}.chart-wrap{background:#ffffff05;border:1px solid #ffffff12;border-radius:12px;max-width:900px;margin:0 auto;padding:18px}.feature-cards-row{grid-template-columns:1fr 1fr;gap:16px;max-width:900px;margin:16px auto 0;display:grid}@media (width<=700px){.feature-cards-row{grid-template-columns:1fr}}.feature-card{border-left:3px solid var(--calc-cyan)}.paint-note{color:var(--calc-text-muted);margin:10px 0 0;font-size:.78rem;line-height:1.5}.faq-section{max-width:900px;margin:30px auto 40px}.faq-title{color:#fff;margin-bottom:14px;font-size:1.1rem;font-weight:700}.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:"+";font-family:var(--font-mono);color:var(--text-dim);flex-shrink:0;margin-left:16px;font-size:1.1rem;transition:color .2s}.faq-item[open] .faq-item__question:after{content:"−";color:var(--accent)}.faq-item__question:hover{color:var(--cyan)}.faq-item__answer{color:var(--text-dim);padding:0 4px 14px;font-size:.85rem;line-height:1.75}.trust-card{border:1px solid #10b98133;border-left:3px solid var(--success);background:#10b9810a;margin-bottom:24px}.trust-badge{color:var(--success);text-transform:uppercase;letter-spacing:.05em;align-items:center;gap:8px;margin-bottom:8px;font-size:.88rem;font-weight:700;display:flex}.trust-meta{color:var(--calc-text-dim);margin-bottom:12px;font-size:.8rem}.trust-sep{margin:0 6px}.trust-text{color:var(--calc-text-dim);margin-bottom:10px;font-size:.87rem;line-height:1.6}.trust-disclaimer{color:var(--text-muted);border-top:1px dashed #ffffff14;padding-top:10px;font-size:.78rem;line-height:1.5}@media (width<=900px){.tab-nav{flex-wrap:wrap}}@media (width<=600px){h1.page-title{font-size:1.4rem}.hero-value{font-size:1.8rem}.stat-grid{grid-template-columns:1fr}}[data-theme=light]{--bg-dark:#e8edf5;--bg-card:#fff;--bg-input:#f0f4f9;--text-main:#0f172a;--text-dim:#334155;--text-muted:#64748b;--cyan:#0891b2;--purple:#7c3aed;--border:#0000001f;--border-focus:#0891b280;--accent:var(--calc-color-math);--accent-glow:#0891b21f;--font-mono:"JetBrains Mono", "Courier New", monospace;--bg-app:#e8edf5;--bg-panel:#fff;--text-primary:#0f172a;--text-secondary:#334155;--border-subtle:#0000001f;--primary:#0891b2;--primary-hover:#0c6680;--success:#059669;--danger:#dc2626}[data-theme=light] body{color:#0f172a;background:#e8edf5}[data-theme=light] .card{background:#fff;border-color:#0000001f;box-shadow:0 2px 12px #00000017}[data-theme=light] .input-card{border-left-color:#0891b2}[data-theme=light] .result-card{border-left-color:#7c3aed}[data-theme=light] .card-header{color:#0f172a;border-bottom-color:#00000014}[data-theme=light] h1.page-title{color:#0f172a}[data-theme=light] .page-sub{color:#475569}[data-theme=light] .breadcrumb,[data-theme=light] .breadcrumb a{color:#64748b}[data-theme=light] .breadcrumb a:hover{color:#0891b2}[data-theme=light] .tab-btn{color:#475569;background:#f0f4f9;border-color:#0000001a}[data-theme=light] .tab-btn:hover{color:#0f172a;background:#0891b214}[data-theme=light] .tab-btn.active{color:#fff;background:#0891b2;border-color:#0891b2;box-shadow:0 2px 8px #0891b233}[data-theme=light] .preset-chip,[data-theme=light] .cov-chip{color:#475569;background:#f0f4f9;border-color:#0000001f}[data-theme=light] .preset-chip:hover,[data-theme=light] .cov-chip:hover{color:#0891b2;background:#0891b214;border-color:#0891b24d}[data-theme=light] .cov-chip.active{color:#0891b2;background:#0891b224;border-color:#0891b266}[data-theme=light] .form-group label{color:#475569}[data-theme=light] .form-group input,[data-theme=light] .glass-input{color:#0f172a;color-scheme:light;background:#f0f4f9;border-color:#0000001f}[data-theme=light] .form-group input:focus,[data-theme=light] .glass-input:focus{border-color:#0891b280;box-shadow:0 0 0 3px #0891b21f}[data-theme=light] .form-group select,[data-theme=light] .glass-select{color:#0f172a;color-scheme:light;background-color:#f0f4f9;border-color:#0000001f}[data-theme=light] .glass-select option{color:#0f172a;background:#fff}[data-theme=light] .glass-input::placeholder{color:#0006}[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:#edf2f9;border-color:#0000001a}[data-theme=light] .stat-label{color:#475569}[data-theme=light] .stat-value{color:#0f172a}[data-theme=light] .alert-info{color:#0e7490;background:#0891b214;border-color:#0891b233}[data-theme=light] .alert-danger{color:#7f1d1d;background:#fff1f2;border-color:#ef444459}[data-theme=light] .interp-card{background:#7c3aed0f;border-color:#7c3aed38}[data-theme=light] .interp-label{color:#7c3aed}[data-theme=light] .interp-text{color:#475569}[data-theme=light] .act-btn{color:#475569;background:#f0f4f9;border-color:#0000001f}[data-theme=light] .act-btn:hover{color:#0891b2;background:#0891b214;border-color:#0891b24d}[data-theme=light] .geo-svg-wrap{background:#f0f4f9;border-color:#0891b233}[data-theme=light] .geo-steps{background:#7c3aed0f;border-color:#7c3aed33}[data-theme=light] .geo-steps h4{color:#7c3aed}[data-theme=light] .geo-step{color:#334155}[data-theme=light] .geo-step strong{color:#0891b2}[data-theme=light] .formula-section-title{color:#0f172a}[data-theme=light] .formula-table th{color:#0f172a;background:#0891b214}[data-theme=light] .formula-table td{color:#334155;border-bottom-color:#00000014}[data-theme=light] .formula-table td:first-child{color:#0f172a}[data-theme=light] .formula-table code{color:#0891b2;background:#0891b214}[data-theme=light] .chart-wrap{background:#f0f4f9;border-color:#0000001a}[data-theme=light] .feature-card{border-left-color:#0891b2}[data-theme=light] .paint-note{color:#64748b}[data-theme=light] .faq-title,[data-theme=light] .faq-item__question{color:#0f172a}[data-theme=light] .faq-item__question:after{color:#64748b}[data-theme=light] .faq-item[open] .faq-item__question:after,[data-theme=light] .faq-item__question:hover{color:#0891b2}[data-theme=light] .faq-item__answer{color:#475569}[data-theme=light] .trust-card{background:#f0fdf4;border-color:#05966933 #05966933 #05966933 #059669}[data-theme=light] .trust-badge{color:#059669}[data-theme=light] .trust-text{color:#334155}[data-theme=light] .trust-disclaimer{color:#64748b;border-top-color:#00000014}