.stc-pair { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:10px; margin:16px 0; }
.stc-pair strong { font-size:1.35rem; overflow-wrap:anywhere; }
.stc-row { display:grid; grid-template-columns:minmax(0,1fr) minmax(0,1fr) auto; gap:8px; align-items:end; }
#stc-tool { min-width:0; }
#stc-tool td, #stc-tool th, #stc-status, #stc-mean-step, #stc-variance-step { overflow-wrap:anywhere; }
#stc-tool .calc-table { table-layout:fixed; width:100%; }
#stc-tool input, #stc-tool textarea, #stc-tool select { min-width:0; }
@media(max-width:480px) { .stc-row { grid-template-columns:minmax(0,1fr) minmax(0,1fr); } .stc-row button { grid-column:1/-1; justify-self:start; } }