body{background-color:var(--calc-bg-page);color:var(--calc-text-primary);min-height:100vh}.main-container{max-width:1400px;margin:0 auto;padding:1.5rem 1.5rem 3rem}.page-title{font-family:var(--calc-font-headline);color:var(--calc-text-primary);margin:0 0 .5rem;font-size:clamp(1.6rem,4vw,2.4rem)}.page-subtitle{color:var(--calc-text-faded);margin:0 0 2rem;line-height:1.5}.tab-nav{border-bottom:1px solid var(--calc-border-default);gap:.5rem;margin-bottom:1.5rem;display:flex;overflow-x:auto}.tab-btn{color:var(--calc-text-faded);cursor:pointer;font-family:var(--calc-font-headline);white-space:nowrap;background:0 0;border:none;border-bottom:2px solid #0000;padding:.75rem 1rem;font-size:.95rem;transition:color .15s,border-color .15s}.tab-btn:hover{color:var(--calc-text-primary)}.tab-btn.active{color:var(--calc-cyan);border-bottom-color:var(--calc-cyan)}.tab-content{display:none}.tab-content.active{display:block}.calc-layout{grid-template-columns:1fr 1fr;align-items:start;gap:1.5rem;display:grid}.form-row{grid-template-columns:1fr 1fr;gap:1rem;display:grid}.stat-grid{grid-template-columns:repeat(auto-fit,minmax(110px,1fr));gap:.75rem;margin-top:1.25rem;display:grid}.stat-card{background:var(--calc-bg-input);border:1px solid var(--calc-border-default);border-radius:var(--calc-radius-md);padding:.65rem .85rem}.stat-label{color:var(--calc-text-faded);margin-bottom:.2rem;font-size:.75rem}.stat-value{color:var(--calc-text-primary);font-family:var(--calc-font-mono);font-size:1rem}.geo-svg-wrap{text-align:center;margin-top:1.5rem}.geo-svg-wrap svg{width:100%;max-width:220px;height:auto}.svg-tri-line{stroke:var(--calc-cyan);stroke-width:2px;fill:none}.svg-tri-poly{stroke:var(--calc-cyan);stroke-width:2px;fill:#22d3ee14}.svg-text-a,.svg-text-b,.svg-text-c{fill:var(--calc-text-faded);font-family:var(--calc-font-mono)}#radius-order-note{background:var(--calc-bg-input);border:1px solid var(--calc-border-default);border-left:3px solid var(--calc-cyan);border-radius:var(--calc-radius-md);margin:0 0 .75rem;padding:.5rem .75rem}@media (width<=768px){.calc-layout,.form-row{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:.05em;color:var(--calc-text-faded);margin:0 0 1rem;font-size:1rem}.form-group{flex-direction:column;gap:.4rem;margin-bottom:1rem;display:flex}.form-group:last-child{margin-bottom:0}.form-group label{color:var(--calc-text-faded);font-size:.9rem}.form-group input,.form-group select{background:var(--calc-bg-input);border:1px solid var(--calc-border-strong);border-radius:var(--calc-radius-md);color:var(--calc-text-primary);font-family:var(--calc-font-mono);transition:var(--calc-transition-default,border-color .15s);padding:.65rem .85rem;font-size:1.05rem}.form-group input:focus,.form-group select:focus{border-color:var(--calc-cyan);outline:none}.input-hint{color:var(--calc-text-dim);font-size:.8rem}.result-value{font-family:var(--calc-font-mono);color:var(--calc-cyan);margin-bottom:.3rem;font-size:clamp(1.8rem,5vw,2.6rem)}.result-detail{color:var(--calc-text-faded);line-height:1.5}.hidden{display:none!important}.solve-chips{flex-wrap:wrap;gap:.4rem;margin-bottom:1rem;display:flex}.chip{background:var(--calc-bg-input);border:1px solid var(--calc-border-default);color:var(--calc-text-faded);cursor:pointer;white-space:nowrap;border-radius:20px;padding:.35rem .9rem;font-size:.78rem;font-weight:600;transition:border-color .2s,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}.formula-strip{flex-wrap:wrap;gap:.5rem;margin-top:1rem;display:flex}.f-pill{background:var(--calc-bg-input);border:1px solid var(--calc-border-default);border-radius:10px;flex-direction:column;flex:auto;align-items:center;gap:.15rem;padding:.5rem .9rem;display:flex}.f-eq{font-family:var(--calc-font-mono);color:var(--calc-cyan);font-size:.85rem}.f-lbl{color:var(--calc-text-faded);text-transform:uppercase;letter-spacing:.04em;font-size:.7rem}.calc-section{margin-top:2.5rem}.calc-section__title{color:var(--calc-text-primary);margin-bottom:1rem;font-size:1.1rem;font-weight:700}.calc-related__card{flex-direction:column;gap:.3rem;display:flex}.faq-list{flex-direction:column;display:flex}.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:.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(--calc-font-mono);color:var(--calc-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(--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{background:#fff;border:1px solid #0000001a;border-radius:10px;transition:box-shadow .2s,border-color .2s;overflow:hidden;box-shadow:0 1px 4px #0000000f}[data-theme=light] .faq-item:hover{border-color:#0891b259;box-shadow:0 2px 10px #0891b214}[data-theme=light] .faq-item[open]{border-color:#0891b266 #0891b266 #0891b266 #0891b2;border-left-style:solid;border-left-width:3px;box-shadow:0 2px 12px #0891b21a}[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,[data-theme=light] .faq-item__question:hover{color:#0891b2}[data-theme=light] .faq-item__answer{color:#475569;border-top:1px solid #0000000f;padding:12px 16px 16px}[data-theme=light] .input-card,[data-theme=light] .result-card{background:#fff;border-color:#0000001f;box-shadow:0 1px 4px #0000000f}[data-theme=light] .form-group input,[data-theme=light] .form-group select{background:#f0f4f9;border-color:#00000026}[data-theme=light] .tab-nav{border-bottom-color:#0000001f}[data-theme=light] .tab-btn{color:#64748b}[data-theme=light] .tab-btn:hover{color:#0f172a}[data-theme=light] .tab-btn.active{color:#0891b2;border-bottom-color:#0891b2}[data-theme=light] .stat-card{background:#f0f4f9;border-color:#00000026}[data-theme=light] .stat-value{color:#0f172a}[data-theme=light] .result-value{color:#0891b2}[data-theme=light] .svg-tri-line,[data-theme=light] .svg-tri-poly{stroke:#0891b2}[data-theme=light] .svg-tri-poly{fill:#0891b214}[data-theme=light] #radius-order-note{background:#f0f4f9;border-color:#00000026 #00000026 #00000026 #0891b2}[data-theme=light] .chip{color:#334155;background:#f0f4f9;border-color:#00000026}[data-theme=light] .chip.active{color:#0891b2;background:#0891b21f;border-color:#0891b2}[data-theme=light] .f-pill{background:#f0f4f9;border-color:#0000001f}[data-theme=light] .f-eq{color:#0891b2}