:root{--accent:var(--calc-color-construction);--bg-app:var(--calc-bg-page);--bg-card:var(--calc-bg-card);--bg-input:var(--calc-bg-input);--text-primary:var(--calc-text-primary);--text-secondary:var(--calc-text-faded);--text-muted:var(--calc-text-dim);--cyan:var(--calc-cyan);--purple:var(--calc-purple);--green:var(--calc-emerald);--red:var(--calc-rose);--amber:var(--calc-amber);--border:var(--calc-border-default);--radius:var(--calc-radius-md)}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg-app);color:var(--text-primary);min-height:100vh;font-family:Inter,sans-serif;line-height:1.5}a{color:inherit;text-decoration:none}.calc-breadcrumb{color:var(--calc-text-muted);padding:10px 24px;font-size:.79rem}.calc-breadcrumb a{color:var(--text-secondary)}.main-container{max-width:1200px;margin:0 auto;padding:24px}.calc-title{margin-bottom:8px;font-size:2rem;font-weight:700}.calc-subtitle{color:var(--text-secondary);margin-bottom:24px}.tab-nav{border-bottom:1px solid var(--calc-border-default);margin-bottom:24px;display:flex}.tab-btn{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;border-bottom:2px solid #0000;margin-bottom:-1px;padding:10px 22px;font-family:inherit;font-size:.9rem;transition:transform .25s,opacity .25s,color .2s,box-shadow .25s}.tab-btn:hover{color:var(--text-primary)}.tab-btn.active{color:var(--accent);border-bottom-color:var(--accent);font-weight:600}.tab-content{display:none}.tab-content.active{display:block}.calc-layout{grid-template-columns:360px 1fr;align-items:start;gap:20px;display:grid}@media (width<=900px){.calc-layout{grid-template-columns:1fr}}.card{background:var(--calc-bg-card);border:1px solid var(--calc-border-default);border-radius:var(--calc-radius-md);padding:20px}.input-card{border-left:3px solid var(--calc-cyan)}.result-card{border-left:3px solid var(--purple)}.form-group{margin-bottom:16px}.form-label{color:var(--text-secondary);margin-bottom:6px;font-size:.82rem;font-weight:500;display:block}.form-input:focus,.form-select:focus{border-color:var(--accent);outline:none}.form-select option{background:var(--calc-bg-card)}.section-title{margin-bottom:14px;font-size:1rem;font-weight:700}.section-divider{border:none;border-top:1px solid var(--calc-border-default);margin:18px 0}.lw-row{grid-template-columns:1fr auto 1fr;align-items:center;gap:8px;display:grid}.lw-sep{color:var(--calc-text-muted);text-align:center;font-size:1.1rem;font-weight:600}.lw-hint{color:var(--calc-text-muted);margin-top:4px;font-size:.73rem}.labor-chips{flex-wrap:wrap;gap:6px;display:flex}.labor-chip{border:1px solid var(--calc-border-default);background:var(--bg-input);color:var(--text-secondary);cursor:pointer;border-radius:8px;padding:7px 12px;font-family:inherit;font-size:.81rem;font-weight:500;transition:transform .25s,opacity .25s,color .2s,box-shadow .25s}.labor-chip:hover{border-color:var(--accent);color:var(--accent)}.labor-chip.active{border-color:var(--accent);color:var(--accent);background:#2dd4bf1f;font-weight:600}.toggle-row{cursor:pointer;align-items:center;gap:10px;padding:8px 0;display:flex}.toggle-row input[type=checkbox]{width:16px;height:16px;accent-color:var(--accent);cursor:pointer;flex-shrink:0}.toggle-row span{color:var(--text-secondary);font-size:.82rem}.hero-result{text-align:center;border-radius:var(--calc-radius-md);background:linear-gradient(135deg,#2dd4bf14,#22d3ee0a);border:1px solid #2dd4bf33;margin-bottom:20px;padding:24px}.hero-label{color:var(--calc-text-muted);text-transform:uppercase;letter-spacing:.08em;margin-bottom:6px;font-size:.78rem}.hero-value{color:var(--accent);font-size:2.2rem;font-weight:800;line-height:1.1}.hero-sub{color:var(--text-secondary);margin-top:6px;font-size:.87rem}.stat-grid{grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px;margin-bottom:20px;display:grid}.stat-card{background:var(--calc-bg-card);border:1px solid var(--calc-border-default);border-left:3px solid var(--purple);border-radius:var(--calc-radius-md);padding:13px}.stat-label{color:var(--calc-text-muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:5px;font-size:.71rem}.stat-value{color:var(--text-primary);font-size:1.05rem;font-weight:700}.formula-strip{flex-wrap:wrap;gap:8px;margin-bottom:20px;display:flex}.formula-pill{color:var(--accent);white-space:nowrap;background:#2dd4bf1a;border:1px solid #2dd4bf4d;border-radius:20px;padding:5px 14px;font-size:.75rem}.alert-stack{flex-direction:column;gap:8px;margin-bottom:16px;display:flex}.alert{border-left:3px solid;border-radius:8px;padding:10px 14px;font-size:.84rem;line-height:1.5}.alert-info{color:#7fffd4;background:#2dd4bf14;border-color:#2dd4bf}.alert-success{border-color:var(--green);color:#6ee7b7;background:#10b98114}.alert-warn{border-color:var(--amber);color:#fcd34d;background:#f59e0b14}.alert-danger{border-color:var(--red);color:#fca5a5;background:#f43f5e14}.proj-chart-wrap{background:#00000040;border:1px solid #2dd4bf33;border-radius:12px;margin:16px 0;padding:1.2rem}.proj-cost-range{background:#2dd4bf14;border:1px solid #2dd4bf40;border-radius:8px;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;margin-top:12px;padding:12px 16px;display:flex}.proj-cost-col{text-align:center}.proj-cost-label{color:var(--calc-text-muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:3px;font-size:.71rem}.proj-cost-low{color:#10b981;font-size:1.1rem;font-weight:700}.proj-cost-est{color:var(--accent);font-size:1.4rem;font-weight:800}.proj-cost-high{color:#f59e0b;font-size:1.1rem;font-weight:700}.proj-interp-card{background:#2dd4bf0f;border-left:4px solid #2dd4bf;border-radius:0 10px 10px 0;margin-top:10px;padding:10px 14px}.proj-interp-title{color:#2dd4bf;text-transform:uppercase;letter-spacing:.05em;margin-bottom:4px;font-size:.82rem;font-weight:700}.proj-interp-text{color:#ccc;font-size:.85rem;line-height:1.6}.seasonal-row{flex-wrap:wrap;gap:6px;margin-top:10px;display:flex}.season-chip{border-radius:16px;padding:4px 10px;font-size:.76rem;font-weight:600}.season-chip.best{color:#10b981;background:#10b9812e;border:1px solid #10b98159}.season-chip.ok{color:#f59e0b;background:#f59e0b24;border:1px solid #f59e0b47}.season-chip.bad{color:#ef4444;background:#ef44441a;border:1px solid #ef444438}.sod-action-bar{border-top:1px solid var(--calc-border-default);flex-wrap:wrap;gap:8px;margin-top:16px;padding-top:12px;display:flex}.sod-action-btn{border:1px solid var(--calc-border-default);color:var(--text-secondary);cursor:pointer;background:#ffffff0a;border-radius:8px;padding:8px 16px;font-family:inherit;font-size:.82rem;font-weight:500;transition:transform .25s,opacity .25s,color .2s,box-shadow .25s}.sod-action-btn:hover{color:var(--accent);background:#2dd4bf14;border-color:#2dd4bf59}.sod-toast{background:var(--calc-bg-card);border:1px solid var(--calc-border-default);z-index:9999;border-radius:10px;max-width:280px;padding:12px 18px;font-size:.87rem;animation:.25s toastIn;position:fixed;bottom:24px;right:24px;box-shadow:0 4px 24px #0006}.sod-toast-success{color:#6ee7b7;border-color:#10b98166}.sod-toast-warn{color:#fcd34d;border-color:#f59e0b66}.sod-toast-error{color:#fca5a5;border-color:#f43f5e66}@keyframes toastIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.data-table{border-collapse:collapse;width:100%;font-size:.87rem}.data-table th{color:var(--accent);text-align:left;border-bottom:1px solid var(--calc-border-default);background:#2dd4bf1a;padding:10px 14px;font-weight:600}.data-table td{color:var(--text-secondary);border-bottom:1px solid #ffffff0a;padding:9px 14px}.data-table tr:hover td{background:#ffffff05}.data-table tr.active-row td{color:var(--text-primary);background:#2dd4bf14}.data-table tr.active-row td:first-child{color:var(--accent);font-weight:700}.type-detail-card{background:#2dd4bf0f;border:1px solid #2dd4bf33;border-radius:12px;margin-bottom:20px;padding:18px}.type-detail-header{align-items:center;gap:10px;margin-bottom:12px;display:flex}.type-detail-name{color:var(--text-primary);font-size:1.1rem;font-weight:700}.type-season-badge{text-transform:uppercase;letter-spacing:.05em;border-radius:12px;padding:3px 9px;font-size:.72rem;font-weight:700}.badge-warm{color:#f59e0b;background:#f59e0b2e;border:1px solid #f59e0b4d}.badge-cool{color:#38bdf8;background:#0ea5e92e;border:1px solid #0ea5e94d}[data-theme=light] .badge-cool{color:#0369a1;background:#0369a11f;border-color:#0369a140}.type-detail-grid{grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:10px;display:grid}.type-detail-stat{border:1px solid var(--calc-border-default);background:#ffffff08;border-radius:8px;padding:10px 12px}.type-detail-stat-label{color:var(--calc-text-muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:3px;font-size:.7rem}.type-detail-stat-value{color:var(--text-primary);font-size:.88rem;font-weight:600}.type-detail-desc{color:var(--text-secondary);margin-top:10px;font-size:.83rem;line-height:1.6}.install-steps{flex-direction:column;gap:12px;margin-top:8px;display:flex}.install-step{border:1px solid var(--calc-border-default);background:#ffffff05;border-radius:10px;grid-template-columns:44px 1fr;align-items:start;gap:12px;padding:14px;display:grid}.install-step__num{width:36px;height:36px;color:var(--accent);background:#2dd4bf26;border:2px solid #2dd4bf59;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:.9rem;font-weight:800;display:flex}.install-step__body h4{color:var(--text-primary);margin-bottom:4px;font-size:.9rem;font-weight:700}.install-step__body p{color:var(--text-secondary);margin-bottom:6px;font-size:.82rem;line-height:1.55}.install-step__cost{color:#f59e0b;background:#f59e0b1f;border:1px solid #f59e0b40;border-radius:10px;padding:2px 9px;font-size:.74rem;font-weight:600;display:inline-block}.proj-timeline{flex-direction:column;gap:0;margin-top:8px;display:flex}.timeline-row{border-left:2px solid #2dd4bf4d;grid-template-columns:120px 1fr;align-items:start;gap:12px;margin-left:8px;padding:12px 0 12px 16px;display:grid}.timeline-row+.timeline-row{border-top:none}.timeline-day{color:var(--accent);white-space:nowrap;font-size:.78rem;font-weight:700}.timeline-desc{color:var(--text-secondary);font-size:.83rem;line-height:1.5}.upgrade-wrap{max-width:900px;margin:2rem auto;padding:0 1rem;overflow-x:hidden}.u-section{margin:2.5rem 0}.u-title{color:var(--calc-cyan);letter-spacing:.03em;margin-bottom:1.2rem;font-size:1.4rem;font-weight:700}.ob-grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1.2rem;display:grid}.ob-card{background:#22d3ee0d;border:1px solid #22d3ee33;border-radius:12px;padding:1.4rem}.ob-num{color:var(--calc-cyan);opacity:.5;font-size:2rem;font-weight:800;line-height:1}.ob-card h3{color:var(--text-primary);margin:.4rem 0 .5rem;font-size:1rem;font-weight:700}.ob-card p{color:var(--text-secondary);margin:0;font-size:.88rem}.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-desc{color:var(--text-secondary);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 dd{color:var(--text-secondary);margin:0;font-size:.82rem}.act-row2{flex-wrap:wrap;gap:10px;margin:24px 0;display:flex}.act-btn2{border:1px solid var(--calc-border-default);color:var(--text-secondary);cursor:pointer;background:#ffffff0a;border-radius:8px;padding:8px 18px;font-family:inherit;font-size:.84rem;font-weight:600;transition:transform .25s,opacity .25s,color .2s,box-shadow .25s}.act-btn2:hover{color:var(--calc-cyan);background:#22d3ee14;border-color:#22d3ee4d}.rel-grid2{grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px;display:grid}.rel-card2{border:1px solid var(--calc-border-default);color:var(--text-secondary);background:#ffffff05;border-radius:10px;padding:12px 14px;font-size:.87rem;text-decoration:none;transition:transform .25s,opacity .25s,color .2s,box-shadow .25s;display:block}.rel-card2:hover{color:var(--calc-cyan);background:#22d3ee0f;border-color:#22d3ee40}.article-body2{color:var(--text-secondary);font-size:.92rem;line-height:1.72}.article-body2 h3{color:var(--text-primary);margin:22px 0 8px;font-size:1.05rem;font-weight:700}.article-body2 p{margin:0 0 12px}.faq-section-extra{max-width:860px;margin:2rem auto;padding:0 1rem}.shape-chip{border:1px solid var(--calc-border-default);background:var(--bg-input);color:var(--text-secondary);cursor:pointer;border-radius:8px;padding:7px 14px;font-size:.83rem;transition:transform .25s,opacity .25s,color .2s,box-shadow .25s}.shape-chip.active{border-color:var(--accent);color:var(--accent);background:#2dd4bf1a}.related-section{max-width:1200px;margin:0 auto;padding:0 24px 48px}.related-section h2{margin-bottom:16px;font-size:1.3rem}.related-grid{grid-template-columns:repeat(auto-fill,minmax(185px,1fr));gap:12px;display:grid}.related-card{background:var(--calc-bg-card);border:1px solid var(--calc-border-default);color:var(--text-secondary);border-radius:8px;padding:13px;font-size:.87rem;transition:transform .25s,opacity .25s,color .2s,box-shadow .25s}.related-card:hover{border-color:var(--accent);color:var(--text-primary)}@media (width<=768px){.main-container{padding:16px}.calc-title{font-size:1.5rem}.tab-btn{padding:8px 12px;font-size:.81rem}}[data-theme=light] .card{background:var(--calc-bg-card);border-color:#00000014;box-shadow:0 2px 8px #0000000f}[data-theme=light] .form-select{color:#0f172a;background:#fff;border-color:#0000001f}[data-theme=light] .form-input:focus,[data-theme=light] .form-select:focus{border-color:var(--accent)}[data-theme=light] .hero-result{background:linear-gradient(135deg,#0f766e0f,#0891b20a);border-color:#0f766e33}[data-theme=light] .hero-value{text-shadow:none}[data-theme=light] .stat-card{border-color:#00000014;border-left-color:var(--purple);background:#f0f4f9}[data-theme=light] .stat-value{color:#0f172a}[data-theme=light] .formula-pill{color:var(--accent);background:#0f766e14;border-color:#0f766e33}[data-theme=light] .tab-nav{background:0 0;border-bottom-color:#0000001a}[data-theme=light] .tab-btn{color:#475569}[data-theme=light] .tab-btn:hover{color:#0f172a;background:#0000000a}[data-theme=light] .tab-btn.active{color:var(--accent);border-bottom-color:var(--accent);background:#0f766e0f}[data-theme=light] .alert-info{color:#0369a1;background:#0891b20f;border-color:#0891b240}[data-theme=light] .alert-success{color:#059669;background:#0596690f;border-color:#05966940}[data-theme=light] .alert-warn{color:#0891b2;background:#0891b20f;border-color:#0891b240}[data-theme=light] .alert-danger{color:#dc2626;background:#dc26260f;border-color:#dc262640}[data-theme=light] .labor-chip{color:#334155;background:#f0f4f9;border-color:#0000001f}[data-theme=light] .labor-chip:hover{border-color:var(--accent);color:var(--accent)}[data-theme=light] .labor-chip.active{border-color:var(--accent);color:var(--accent);background:#0f766e1a}[data-theme=light] .toggle-row span{color:#334155}[data-theme=light] .proj-chart-wrap{background:#f8fafb;border-color:#0f766e33}[data-theme=light] .proj-cost-range{background:#0f766e0f;border-color:#0f766e26}[data-theme=light] .proj-interp-card{border-left-color:var(--accent);background:#eff9f8}[data-theme=light] .proj-interp-title{color:var(--accent)}[data-theme=light] .proj-interp-text{color:#334155}[data-theme=light] .proj-cost-est{color:var(--accent)}[data-theme=light] .season-chip.best{color:#059669;background:#0596691a;border-color:#05966940}[data-theme=light] .season-chip.ok{color:#0891b2;background:#0891b21a;border-color:#0891b240}[data-theme=light] .season-chip.bad{color:#dc2626;background:#dc262614;border-color:#dc262633}[data-theme=light] .sod-action-btn{color:#334155;background:#00000008;border-color:#0000001f}[data-theme=light] .sod-action-btn:hover{border-color:var(--accent);color:var(--accent);background:#0f766e14}[data-theme=light] .sod-toast{color:#0f172a;background:#fff;border-color:#00000026;box-shadow:0 4px 20px #0000001f}[data-theme=light] .sod-toast-success{color:#059669;border-color:#05966966}[data-theme=light] .data-table th{color:var(--accent);background:#0f766e14;border-bottom-color:#0000001a}[data-theme=light] .data-table td{color:#334155;border-bottom-color:#0000000f}[data-theme=light] .data-table tr:hover td{background:#00000005}[data-theme=light] .data-table tr.active-row td{color:#0f172a;background:#0f766e12}[data-theme=light] .data-table tr.active-row td:first-child{color:var(--accent)}[data-theme=light] .type-detail-card{background:#eff9f8;border-color:#0f766e33}[data-theme=light] .type-detail-stat{background:#f0f4f9;border-color:#00000014}[data-theme=light] .type-detail-stat-value{color:#0f172a}[data-theme=light] .type-detail-desc{color:#475569}[data-theme=light] .install-step{background:#fff;border-color:#00000014;box-shadow:0 1px 4px #0000000a}[data-theme=light] .install-step__num{background:#0f766e1a;border-color:#0f766e40}[data-theme=light] .install-step__body h4{color:#0f172a}[data-theme=light] .install-step__body p{color:#475569}[data-theme=light] .proj-timeline{border-color:#0f766e33}[data-theme=light] .timeline-row{border-left-color:#0f766e4d}[data-theme=light] .timeline-desc{color:#475569}[data-theme=light] .faq-q{color:#0f172a}[data-theme=light] .faq-q:after{color:#64748b}[data-theme=light] .faq-item.open .faq-q:after,[data-theme=light] .faq-q:hover{color:var(--accent)}[data-theme=light] .faq-a{color:#475569}[data-theme=light] .glossary-chip{background:#f0f4f9;border-color:#00000014}[data-theme=light] .glossary-chip dt{color:var(--accent)}[data-theme=light] .glossary-chip dd{color:#475569}[data-theme=light] .rel-card2{background:#f0f4f9;border-color:#00000014}[data-theme=light] .rel-card2:hover{border-color:var(--accent);color:var(--accent);background:#0f766e0f}[data-theme=light] .fp2{background:#7c3aed0f;border-color:#7c3aed2e}[data-theme=light] .fp2-desc{color:#475569}[data-theme=light] .calc-breadcrumb,[data-theme=light] .calc-breadcrumb a{color:#64748b}[data-theme=light] .calc-breadcrumb a:hover{color:var(--accent)}[data-theme=light] input,[data-theme=light] select{color-scheme:light}[data-theme=light] .section-divider{border-top-color:#00000014}.formula-pills2{margin-bottom:3rem}.fp2-title{margin-bottom:1rem;font-size:1.1rem;font-weight:700}.fp2-grid{grid-template-columns:repeat(3,1fr);gap:.75rem;display:grid}.fp2-pill{background:#22d3ee0f;border:1px solid #22d3ee26;border-radius:10px;flex-direction:column;gap:4px;padding:.75rem 1rem;display:flex}[data-theme=light] .fp2-pill{background:#0891b20f;border-color:#0891b233}.fp2-name{color:var(--calc-text-dim);text-transform:uppercase;letter-spacing:.04em;font-size:.72rem}.fp2-eq{font-family:var(--font-mono);color:var(--calc-cyan);font-size:.82rem;font-weight:600}[data-theme=light] .fp2-eq{color:#0891b2}.faq-section{margin-bottom:3rem}.faq-title{margin-bottom:1rem;font-size:1.1rem;font-weight:700}.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 .2s;display:flex}.faq-item__question::-webkit-details-marker{display:none}.faq-item__question:after{content:"+";font-family:var(--font-mono);color:var(--calc-text-dim);flex-shrink:0;margin-left:16px;font-size:1.1rem;transition:color .2s}.faq-item-enhanced[open] .faq-item__question:after{content:"‘2";color:var(--calc-cyan)}.faq-item__question:hover{color:var(--calc-cyan)}.faq-item__answer{color:var(--calc-text-dim);padding:0 4px 14px;font-size:.85rem;line-height:1.75}[data-theme=light] .faq-list{gap:8px}[data-theme=light] .faq-item-enhanced{background:#fff;border:1px solid #0000001a;border-radius:10px;overflow:hidden;box-shadow:0 1px 4px #0000000f}[data-theme=light] .faq-item__question{color:#0f172a;padding:14px 16px}[data-theme=light] 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strong{color:var(--text-main,#fff)}.gloss-section2{margin-bottom:3rem}.gs2-title{margin-bottom:1rem;font-size:1.1rem;font-weight:700}.gs2-grid{grid-template-columns:repeat(2,1fr);gap:1rem;display:grid}@media (width<=700px){.gs2-grid{grid-template-columns:1fr}}.gs2-item{background:var(--card,#ffffff0a);border:1px solid var(--border,#ffffff1a);color:var(--text-dim,#88a);border-radius:10px;padding:1rem;font-size:.83rem;line-height:1.7}[data-theme=light] .gs2-item{background:#fff;border-color:#0000001a;box-shadow:0 1px 3px #0000000d}.gs2-item strong{color:var(--text-main,#fff)}@media 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