.main-container{max-width:1400px;margin:0 auto;padding:40px 20px}.page-title{font-family:var(--calc-font-headline);color:var(--calc-text-primary);margin:0 0 .4rem;font-size:clamp(1.7rem,4vw,2.5rem);font-weight:800}.page-subtitle{color:var(--calc-text-faded);max-width:820px;margin:0 0 1.5rem;line-height:1.55}.action-bar{flex-wrap:wrap;gap:.5rem;margin:0 0 1.5rem;display:flex}.action-btn{background:var(--calc-bg-card);border:1px solid var(--calc-border-default);border-radius:var(--calc-radius-md);color:var(--calc-text-faded);cursor:pointer;padding:.5rem .9rem;font-size:.85rem;transition:border-color .15s,color .15s,background .15s}.action-btn:hover{border-color:var(--calc-cyan);color:var(--calc-cyan)}.action-btn--reset{margin-left:auto}.calc-layout{grid-template-columns:1.1fr .9fr;align-items:start;gap:1.5rem;display:grid}@media (width<=1024px){.calc-layout{grid-template-columns:1fr}}.input-card,.result-card{background:var(--calc-bg-card);border:1px solid var(--calc-border-default);border-radius:var(--calc-radius-lg);margin-bottom:1.25rem;padding:1.25rem 1.5rem}.card-title{font-family:var(--calc-font-headline);text-transform:uppercase;letter-spacing:.08em;color:var(--calc-text-faded);margin:0 0 1rem;font-size:.78rem}.tab-control{flex-wrap:wrap;gap:.4rem;margin-bottom:1rem;display:flex}.tab-btn{background:var(--calc-bg-card);border:1px solid var(--calc-border-default);border-radius:var(--calc-radius-md);min-width:120px;color:var(--calc-text-faded);cursor:pointer;flex:1;padding:.6rem .5rem;font-size:.88rem;font-weight:600;transition:border-color .15s,color .15s,background .15s}.tab-btn:hover{color:var(--calc-text-primary)}.tab-btn.active{color:var(--calc-cyan);background:#22d3ee1a;border-color:#22d3ee80}.tab-panel[hidden]{display:none}.field{margin-bottom:1rem}.field-label{color:var(--calc-text-faded);margin-bottom:.35rem;font-size:.85rem;display:block}input[type=text],select.full-select{background:var(--calc-bg-input);border:1px solid var(--calc-border-strong);border-radius:var(--calc-radius-md);width:100%;color:var(--calc-text-primary);font-family:var(--calc-font-mono);box-sizing:border-box;padding:.6rem .75rem;font-size:1rem;transition:border-color .15s}input[type=text]:focus,select.full-select:focus{border-color:var(--calc-cyan);outline:none}input[type=text]:disabled{opacity:.6;cursor:not-allowed}.field-hint{color:var(--calc-text-dim);margin-top:.3rem;font-size:.78rem}.panel-hint{color:var(--calc-text-dim);margin:.5rem 0 0;font-size:.85rem;line-height:1.5}.solve-chips{flex-wrap:wrap;gap:.4rem;display:flex}.chip{background:var(--calc-bg-input);border:1px solid var(--calc-border-default);color:var(--calc-text-dim);cursor:pointer;font-size:.78rem;font-weight:600;font-family:var(--calc-font-body,Inter, sans-serif);white-space:nowrap;border-radius:20px;padding:.35rem .85rem;transition:color .2s,border-color .2s,background .2s}.chip:hover{border-color:var(--calc-cyan);color:var(--calc-cyan)}.chip.active{border-color:var(--calc-cyan);color:var(--calc-cyan);background:#22d3ee1f}.result-value{font-family:var(--calc-font-mono);color:var(--calc-cyan);margin-bottom:.35rem;font-size:clamp(2rem,6vw,2.9rem);font-weight:700;line-height:1.1}.result-value--partial,.result-value--idle{color:var(--calc-text-dim)}.result-detail{color:var(--calc-text-faded);margin-bottom:1rem;font-size:.92rem;line-height:1.5}.stat-grid{grid-template-columns:repeat(2,1fr);gap:.6rem;margin-bottom:1rem;display:grid}.stat-cell{background:var(--calc-bg-input);border:1px solid var(--calc-border-default);border-radius:var(--calc-radius-md);text-align:center;padding:.65rem}.stat-val{font-size:.95rem;font-weight:700;font-family:var(--calc-font-mono);color:var(--calc-text-primary);word-break:break-word;margin-bottom:.2rem}.stat-lbl{color:var(--calc-text-dim);text-transform:uppercase;letter-spacing:.04em;font-size:.68rem}.interpretation{border-left:3px solid var(--calc-cyan);border-radius:0 var(--calc-radius-md) var(--calc-radius-md) 0;color:var(--calc-text-faded);background:#22d3ee12;margin:0 0 1rem;padding:.85rem 1rem;font-size:.9rem;line-height:1.6}.interpretation:empty{display:none}.interpretation--warn{border-left-color:var(--calc-amber);color:var(--calc-text-faded);background:#fbbf2417}.alert-box{border-radius:var(--calc-radius-md);border:1px solid #0000;margin-bottom:.75rem;padding:.65rem .9rem;font-size:.83rem}.alert-box.hidden{display:none}.alert-box.warn{color:var(--calc-amber);background:#f59e0b14;border-color:#f59e0b40}.formula-strip{flex-wrap:wrap;gap:.5rem;margin-bottom:1rem;display:flex}.f-pill{background:#22d3ee14;border:1px solid #22d3ee33;border-radius:8px;align-items:center;gap:.5rem;padding:.4rem .75rem;display:flex}.f-eq{font-family:var(--calc-font-mono);color:var(--calc-cyan);font-size:.8rem}.f-lbl{color:var(--calc-text-dim);font-size:.72rem}.section-title-sm{text-transform:uppercase;letter-spacing:.06em;color:var(--calc-text-faded);margin:1.5rem 0 .75rem;font-size:.85rem;font-weight:700}.scenario-compare{grid-template-columns:1fr 1fr;gap:1rem;display:grid}@media (width<=640px){.scenario-compare{grid-template-columns:1fr}}.scenario-card{background:var(--calc-bg-input);border:1px solid var(--calc-border-default);border-radius:12px;padding:1rem}.scenario-title{color:var(--calc-purple);text-transform:uppercase;letter-spacing:.04em;margin-bottom:.6rem;font-size:.8rem;font-weight:700}.proj-stat{justify-content:space-between;align-items:center;padding:.4rem 0;font-size:.83rem;display:flex}.ps-lbl{color:var(--calc-text-dim);font-weight:600}.ps-val{color:var(--calc-text-primary);font-family:var(--calc-font-mono);font-weight:700}.scenario-tag{color:var(--calc-cyan);text-align:center;background:#22d3ee1a;border-radius:6px;margin-top:.5rem;padding:.4rem .6rem;font-size:.78rem;font-weight:600}.calc-section{margin-top:2rem}.calc-section__title{font-family:var(--calc-font-headline);color:var(--calc-text-primary);margin-bottom:1rem;font-size:1.2rem}.faq-item{border-bottom:1px solid #ffffff0f}.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:.95rem;font-weight:600;list-style:none;display:flex}.faq-item__question::-webkit-details-marker{display:none}.faq-item__question:after{content:"+";font-family:var(--calc-font-mono);color:var(--calc-text-dim);margin-left:16px;font-size:1.1rem}.faq-item[open] .faq-item__question:after{content:"−";color:var(--calc-cyan)}.faq-item__answer{color:var(--calc-text-faded);padding:0 4px 14px;font-size:.88rem;line-height:1.7}[data-theme=light] .action-btn,[data-theme=light] .tab-btn,[data-theme=light] .chip{color:#475569;background:#fff;border-color:#0000001f}[data-theme=light] .tab-btn.active,[data-theme=light] .chip.active{color:#0891b2;background:#0891b21a;border-color:#0891b2}[data-theme=light] .chip:hover{color:#0891b2;border-color:#0891b2}[data-theme=light] .input-card,[data-theme=light] .result-card,[data-theme=light] .scenario-card{background:#fff;border-color:#0000001f;box-shadow:0 1px 4px #0000000f}[data-theme=light] input[type=text],[data-theme=light] select.full-select{color:#0f172a;background:#f0f4f9;border-color:#00000026}[data-theme=light] .stat-cell{background:#edf2f9;border-color:#0000001a}[data-theme=light] .result-value{color:#0891b2}[data-theme=light] .result-value--partial,[data-theme=light] .result-value--idle{color:#64748b}[data-theme=light] .f-pill{background:#0891b212;border-color:#0891b233}[data-theme=light] .f-eq{color:#0891b2}[data-theme=light] .interpretation{color:#334155;background:#eff9fb;border-left-color:#0891b2}[data-theme=light] .interpretation--warn{color:#334155;background:#fffbeb;border-left-color:#b45309}[data-theme=light] .alert-box.warn{color:#78350f;background:#fffbeb;border-color:#d9770659}[data-theme=light] .scenario-title{color:#7c3aed}[data-theme=light] .scenario-tag{color:#0891b2;background:#0891b214}[data-theme=light] .faq-item{background:#fff;border:1px solid #0000001a;border-radius:10px;margin-bottom:8px;overflow:hidden;box-shadow:0 1px 4px #0000000f}[data-theme=light] .faq-item[open]{border-left:3px solid #0891b2}[data-theme=light] .faq-item__question{color:#0f172a;padding:14px 16px}[data-theme=light] .faq-item__question:after{color:#64748b}[data-theme=light] .faq-item[open] .faq-item__question:after{color:#0891b2}[data-theme=light] .faq-item__answer{color:#475569;border-top:1px solid #0000000f;padding:12px 16px 16px}