.divisibility{--rule-blue:#287f9a;--rule-blue-soft:#dff4f8;--rule-yellow:#f2c45f;--rule-ink:#30323a}.divisibility .eyebrow{color:var(--rule-blue)}.divisibility h1 em{color:#d85f79}.five-phases{grid-template-columns:repeat(5,1fr)}.rule-board{display:flex;flex-direction:column;gap:16px;min-height:285px;justify-content:center}.number-row{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}.number-card{background:#fff;border:2px solid #b8dfe6;border-radius:14px;box-shadow:0 5px 14px rgba(48,50,58,.08);font:900 clamp(24px,4vw,36px) Nunito,sans-serif;letter-spacing:.04em;padding:12px 15px}.number-card mark{background:#ffe39b;border-radius:7px;color:inherit;padding:0 3px}.number-card .sum{color:#26727d;display:block;font:800 14px Nunito,sans-serif;letter-spacing:0;margin-top:5px;text-align:center}.rule-note{background:#ffffffdc;border:1px solid #cfe8ec;border-radius:14px;color:#4f7278;font-size:15px;font-weight:700;line-height:1.45;margin:0 auto;max-width:620px;padding:11px 14px;text-align:center}.compare-lanes{display:grid;gap:12px;grid-template-columns:repeat(2,minmax(0,1fr));margin:auto;max-width:620px;width:100%}.lane{background:#fff;border:2px solid #cfe8ec;border-radius:16px;padding:14px;text-align:center}.lane strong{color:#26727d;display:block;font:900 16px Nunito,sans-serif;margin-bottom:9px}.lane .number-row{gap:7px}.lane .number-card{font-size:22px;padding:8px 10px}.lock-panel{align-items:center;display:flex;flex-wrap:wrap;gap:12px;justify-content:center}.lock{background:#fff;border:2px solid #ded8ef;border-radius:16px;min-width:145px;padding:15px;text-align:center}.lock b{display:block;font:900 17px Nunito,sans-serif}.lock span{color:#6c6874;display:block;font-size:14px;margin-top:5px}.lock.open{background:#e4f5e9;border-color:#9ed0ae}.lock.closed{background:#ffe7ec;border-color:#efbac5}.lock-plus{font:900 24px Nunito,sans-serif}.scenario-card{background:#fff;border:2px solid #b8dfe6;border-radius:18px;margin:auto;max-width:610px;padding:20px;text-align:center}.scenario-card .big-number{font:900 clamp(38px,7vw,64px) Nunito,sans-serif}.scenario-card p{color:#5f626d;font-size:16px;line-height:1.5;margin:8px 0 0}.multi-hint{background:#fff4d6;border:1px solid #ead39e;border-radius:10px;color:#76591f;font-size:13px;font-weight:700;margin-bottom:10px;padding:8px 10px}.choice.selected{background:var(--aqua-soft);border-color:var(--aqua)}.choice.correct{background:var(--green-soft);border-color:var(--green)}.choice.wrong{background:var(--coral-soft);border-color:var(--coral)}
@media(max-width:760px){.five-phases{grid-template-columns:repeat(5,minmax(58px,1fr));overflow-x:auto}.five-phases .phase-step{flex-direction:column}.compare-lanes{grid-template-columns:1fr}.rule-board{min-height:230px}}