#weight-balance-lesson .wb-cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
#weight-balance-lesson .wb-two{grid-template-columns:repeat(2,minmax(0,1fr))}
#weight-balance-lesson .wb-card{padding:20px;border:1px solid var(--line);background:white;border-radius:12px}
#weight-balance-lesson .wb-card h3{font-size:23px;margin:4px 0 16px}
#weight-balance-lesson .wb-formula{display:grid;gap:12px;margin:24px 0;padding:22px;background:var(--navy);color:white;border-radius:12px;font-size:19px;overflow-wrap:anywhere}
#weight-balance-lesson .wb-lab{padding:24px;background:white;border:1px solid #a6c1cb;border-radius:16px;margin:24px 0}
#weight-balance-lesson .wb-buttons{display:flex;gap:8px;flex-wrap:wrap}
#weight-balance-lesson button{background:var(--navy);color:white;border:1px solid var(--navy);border-radius:8px;padding:10px 15px;min-height:44px;cursor:pointer}
#weight-balance-lesson button:hover{background:var(--teal)}
#weight-balance-lesson button:disabled{opacity:.5;cursor:default}
#weight-balance-lesson .wb-controls{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:22px 0}
#weight-balance-lesson fieldset{min-width:0;border:1px solid var(--line);border-radius:10px;padding:16px}
#weight-balance-lesson legend{padding:0 7px;font-weight:700}
#weight-balance-lesson label{display:flex;justify-content:space-between;gap:12px;font-weight:600;flex-wrap:wrap}
#weight-balance-lesson output{color:var(--teal);font-variant-numeric:tabular-nums}
#weight-balance-lesson input[type=range]{display:block;width:100%;min-height:36px;margin:8px 0 15px;accent-color:var(--teal)}
#weight-balance-lesson select{font:inherit;width:100%;min-height:48px;background:var(--paper);color:var(--ink);border:1px solid #829ca8;border-radius:8px;padding:10px;margin:10px 0 22px}
#weight-balance-lesson :is(select,input):focus-visible{outline:3px solid #287f9a;outline-offset:4px}
#seesaw{display:block;width:100%;height:auto;margin-top:24px;background:var(--paper);border-radius:12px}
#seesaw text{font:14px 'DM Sans',sans-serif;fill:var(--navy)}
#seesaw .block-label{fill:white;font-size:20px;font-weight:700;text-anchor:middle}
#weight-balance-lesson .wb-caption{font-size:13px}
#weight-balance-lesson .wb-equation{font-size:19px;font-weight:700;color:var(--navy);overflow-wrap:anywhere}
#weight-balance-lesson .wb-feedback{padding:16px;border-left:3px solid var(--teal);background:var(--paper);color:var(--ink)}
#weight-balance-lesson .wb-table-wrap{overflow-x:auto;margin:24px 0}
#weight-balance-lesson table{width:100%;border-collapse:collapse;font-size:14px;font-variant-numeric:tabular-nums}
#weight-balance-lesson caption{text-align:left;color:var(--muted);margin-bottom:12px}
#weight-balance-lesson th,#weight-balance-lesson td{text-align:left;padding:12px 10px;border:1px solid var(--line)}
#weight-balance-lesson thead th{background:var(--navy);color:white}
#weight-balance-lesson tfoot{background:var(--paper);font-weight:700}
#weight-balance-lesson .wb-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;padding:20px 0}
#weight-balance-lesson .wb-metrics span{display:block;font-size:13px;color:var(--muted)}
#weight-balance-lesson .wb-metrics strong{font-size:23px;color:var(--navy)}
@media(max-width:650px){#weight-balance-lesson .wb-cards,#weight-balance-lesson .wb-controls{grid-template-columns:1fr}#weight-balance-lesson .wb-lab{padding:16px}#weight-balance-lesson th,#weight-balance-lesson td{padding:8px 6px;font-size:12px}#weight-balance-lesson .wb-metrics{grid-template-columns:1fr}#weight-balance-lesson .wb-metrics strong{font-size:24px}#weight-balance-lesson .wb-formula{font-size:17px;padding:18px}}

@media(max-width:650px){#seesaw text{font-size:24px}#seesaw .block-label{font-size:26px}}