:root{--bsc-primary:#e11d48;--bsc-primary-light:#fff1f2;--bsc-primary-shadow:#e11d4840;--bsc-text:#1e293b;--bsc-text-secondary:#475569;--bsc-text-muted:#64748b;--bsc-bg:#fff;--bsc-bg-secondary:#f8fafc;--bsc-border:#e2e8f0;--bsc-radius:var(--main-radius,.5rem);--bsc-radius-lg:var(--main-radius-lg,.75rem);--bsc-shadow:0 1px 3px #0000000f, 0 1px 2px #0000000a;--bsc-shadow-md:0 4px 12px #00000014}._bsc-container{max-width:560px;margin:0 auto}@media (max-width:768px){._bsc-container{padding-left:1rem;padding-right:1rem}}._bsc-input-section{background:var(--bsc-bg);border-radius:var(--bsc-radius-lg);box-shadow:var(--bsc-shadow);border-style:solid;border-width:1px;border-color:var(--bsc-border);flex-direction:column;gap:1rem;margin-bottom:1rem;padding:1.25rem;display:flex}._bsc-field{flex-direction:column;gap:.375rem;display:flex}._bsc-label{color:var(--bsc-text);align-items:center;gap:.375rem;font-size:.8125rem;font-weight:600;display:flex}._bsc-label svg{color:var(--bsc-text-muted)}._bsc-hint{color:var(--bsc-text-muted);font-size:.75rem;line-height:1.4}._bsc-unit-toggle{background:var(--bsc-bg-secondary);border-radius:var(--bsc-radius);border-style:solid;border-width:1.5px;border-color:var(--bsc-border);display:flex;overflow:hidden}._bsc-unit-btn{color:var(--bsc-text-muted);cursor:pointer;background:0 0;border:none;flex:1;padding:.5rem .75rem;font-family:inherit;font-size:.8125rem;font-weight:600;transition:all .15s}._bsc-unit-btn._bsc-unit-active{background:var(--bsc-primary);color:#fff}._bsc-unit-btn:not(._bsc-unit-active):hover{color:var(--bsc-primary)}._bsc-input-wrapper{background:var(--bsc-bg-secondary);border-style:solid;border-width:1.5px;border-color:var(--bsc-border);border-radius:var(--bsc-radius);align-items:center;transition:border-color .2s,box-shadow .2s;display:flex;overflow:hidden}._bsc-input-wrapper:focus-within{border-color:var(--bsc-primary);box-shadow:0 0 0 3px #e11d481a}._bsc-input{color:var(--bsc-text);background:0 0;border:none;outline:none;flex:1;min-width:0;padding:.625rem .75rem;font-family:inherit;font-size:1rem;font-weight:500}._bsc-input::placeholder{color:#94a3b8}._bsc-input::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}._bsc-input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}._bsc-input[type=number]{-moz-appearance:textfield}._bsc-input-unit{color:var(--bsc-text-muted);border-left-style:solid;border-left-width:1px;border-left-color:var(--bsc-border);white-space:nowrap;background:0 0;padding:.625rem .75rem;font-size:.8125rem;font-weight:600}._bsc-calculate-btn{background:var(--bsc-primary);color:#fff;border-radius:var(--bsc-radius);cursor:pointer;width:100%;box-shadow:0 2px 8px var(--bsc-primary-shadow);border:none;justify-content:center;align-items:center;gap:.5rem;padding:.75rem;font-family:inherit;font-size:.9375rem;font-weight:600;transition:opacity .15s,box-shadow .15s;display:flex}._bsc-calculate-btn:hover{opacity:.9}@media (max-width:480px){._bsc-input-section{padding:1rem}}._bsc-result-section{flex-direction:column;gap:1rem;margin-bottom:1rem;display:flex}._bsc-result-card{background:var(--bsc-bg);border-radius:var(--bsc-radius-lg);box-shadow:var(--bsc-shadow);border-style:solid;border-width:1px;border-color:var(--bsc-border);text-align:center;padding:1.5rem}._bsc-result-header{color:var(--bsc-text-muted);justify-content:center;align-items:center;gap:.375rem;margin-bottom:.75rem;font-size:.8125rem;font-weight:600;display:flex}._bsc-result-header svg{color:var(--bsc-primary)}._bsc-primary-size{color:var(--bsc-primary);margin-bottom:.25rem;font-size:2.5rem;font-weight:700;line-height:1.1}._bsc-size-label{color:var(--bsc-text-muted);font-size:.8125rem}._bsc-sizes-grid{grid-template-columns:repeat(3,1fr);gap:.5rem;display:grid}._bsc-size-item{background:var(--bsc-bg);border-radius:var(--bsc-radius);text-align:center;box-shadow:var(--bsc-shadow);border-style:solid;border-width:1px;border-color:var(--bsc-border);padding:.75rem .5rem}._bsc-size-system{color:var(--bsc-text-muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:.25rem;font-size:.6875rem;font-weight:600}._bsc-size-value{color:var(--bsc-text);font-size:1.0625rem;font-weight:700}._bsc-sister-card{background:var(--bsc-bg);border-radius:var(--bsc-radius-lg);box-shadow:var(--bsc-shadow);border-style:solid;border-width:1px;border-color:var(--bsc-border);padding:1.25rem}._bsc-sister-header{color:var(--bsc-text);align-items:center;gap:.375rem;margin-bottom:.25rem;font-size:.8125rem;font-weight:600;display:flex}._bsc-sister-header svg{color:var(--bsc-primary)}._bsc-sister-desc{color:var(--bsc-text-muted);margin-bottom:.75rem;font-size:.75rem}._bsc-sister-sizes{flex-wrap:wrap;gap:.5rem;display:flex}._bsc-sister-tag{border-radius:var(--main-radius-full,9999px);background:var(--bsc-bg-secondary);color:var(--bsc-text);border-style:solid;border-width:1px;border-color:var(--bsc-border);align-items:center;gap:.25rem;padding:.375rem .75rem;font-size:.8125rem;font-weight:600;display:inline-flex}._bsc-sister-tag._bsc-sister-down{color:#0369a1;background:#f0f9ff;border-color:#bae6fd}._bsc-sister-tag._bsc-sister-up{color:#7c3aed;background:#f5f3ff;border-color:#ddd6fe}._bsc-sister-tag svg{width:10px;height:10px}._bsc-tips-card{background:var(--bsc-bg);border-radius:var(--bsc-radius-lg);box-shadow:var(--bsc-shadow);border-style:solid;border-width:1px;border-color:var(--bsc-border);padding:1.25rem}._bsc-tips-header{color:var(--bsc-text);align-items:center;gap:.375rem;margin-bottom:.75rem;font-size:.8125rem;font-weight:600;display:flex}._bsc-tips-header svg{color:var(--bsc-primary)}._bsc-tips-list{flex-direction:column;gap:.5rem;margin:0;padding:0;list-style:none;display:flex}._bsc-tips-list li{color:var(--bsc-text-secondary);align-items:flex-start;gap:.5rem;font-size:.8125rem;line-height:1.5;display:flex}._bsc-tips-list li svg{color:var(--bsc-primary);flex-shrink:0;margin-top:.1875rem}@media (max-width:480px){._bsc-sizes-grid{grid-template-columns:repeat(2,1fr)}._bsc-primary-size{font-size:2rem}._bsc-result-card,._bsc-sister-card,._bsc-tips-card{padding:1rem}}._bsc-reference{background:var(--bsc-bg);border-radius:var(--bsc-radius-lg);box-shadow:var(--bsc-shadow);border-style:solid;border-width:1px;border-color:var(--bsc-border);padding:1.25rem}._bsc-reference-title{color:var(--bsc-text);align-items:center;gap:.375rem;margin-bottom:.75rem;font-size:.8125rem;font-weight:600;display:flex}._bsc-reference-title svg{color:var(--bsc-primary)}._bsc-reference-content p{color:var(--bsc-text-secondary);margin:0 0 .5rem;font-size:.8125rem;line-height:1.6}._bsc-reference-content p:last-child{margin-bottom:0}._bsc-reference-note{font-style:italic;color:var(--bsc-text-muted)!important}