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(width<=900px){.playground{grid-template-columns:minmax(0,1fr)}.playground-lanes{max-height:380px;position:static}}.rail-choice{flex-wrap:wrap;gap:16px;margin-top:12px;display:flex}.rail-option{color:var(--muted);cursor:pointer;align-items:center;gap:6px;font-size:13px;display:inline-flex}.rail-option:hover{color:var(--text)}.rail-option input{accent-color:var(--accent);cursor:pointer}