.main-container{max-width:960px;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);max-width:68ch;margin:0 0 1.5rem;line-height:1.5}.action-bar{flex-wrap:wrap;gap:.5rem;margin-bottom:1.25rem;display:flex}.action-btn{background:var(--calc-bg-input);border:1px solid var(--calc-border-default);color:var(--calc-text-faded);cursor:pointer;font-size:.8rem;font-weight:600;font-family:var(--calc-font-body);border-radius:8px;padding:.5rem .9rem;transition:border-color .2s,color .2s}.action-btn:hover{border-color:var(--calc-cyan);color:var(--calc-cyan)}.action-btn--reset:hover{border-color:var(--calc-rose);color:var(--calc-rose)}[data-theme=light] .action-btn{color:#334155;background:#f0f4f9;border-color:#00000026}.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);width:100%;padding:.65rem .85rem;font-size:1.05rem;transition:border-color .15s}.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}.input-row{align-items:center;gap:.5rem;display:flex}.input-row input{flex:1}.unit-suffix{color:var(--calc-text-dim);font-family:var(--calc-font-mono);white-space:nowrap;font-size:.9rem}.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}.interpretation{color:var(--calc-text-dim);border-top:1px solid var(--calc-border-subtle,#ffffff14);margin-top:.6rem;padding-top:.6rem;font-size:.85rem;line-height:1.5}.speed-compare{flex-direction:column;gap:.75rem;margin-top:1rem;display:flex}.speed-row{grid-template-columns:1fr;gap:.3rem;display:grid}.speed-row__label{color:var(--calc-text-faded);justify-content:space-between;gap:.5rem;font-size:.85rem;display:flex}.speed-row__formula{font-family:var(--calc-font-mono);color:var(--calc-text-dim);font-size:.78rem}.speed-row__bar-track{background:var(--calc-bg-input);border-radius:5px;height:10px;overflow:hidden}.speed-row__bar{background:var(--calc-cyan);border-radius:5px;height:100%}.speed-row__value{font-family:var(--calc-font-mono);color:var(--calc-text-primary);font-size:.95rem}.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] .unit-suffix{color:#64748b}[data-theme=light] .result-value{color:#0891b2}[data-theme=light] .interpretation{border-top-color:#00000014}[data-theme=light] .speed-row__bar-track{background:#eef2f7}[data-theme=light] .speed-row__bar{background:#0891b2}