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p{color:var(--ink-soft);margin:0;font-size:1.02rem;line-height:1.65}.rule-work{border:1px solid var(--line);background:#f8f4eb;border-radius:20px;padding:clamp(18px,3vw,30px);box-shadow:inset 0 1px #ffffffbf}.math-line{border-bottom:1px solid var(--line);padding:17px 0}.math-line:first-child{padding-top:0}.math-line:last-child{border-bottom:0;padding-bottom:0}.math-line>small{color:var(--teal-dark);letter-spacing:.11em;text-transform:uppercase;margin-bottom:11px;font-size:.7rem;font-weight:800;line-height:1.35;display:block}.math-expression{color:var(--ink);flex-wrap:wrap;align-items:center;gap:.46em;font-family:Georgia,Times New Roman,serif;font-size:clamp(1.25rem,2.4vw,1.75rem);line-height:1.6;display:flex}.didactic-arrow{border-left:4px solid var(--teal);color:var(--teal-dark);background:#dcece89e;border-radius:0 12px 12px 0;grid-template-columns:26px minmax(0,1fr);align-items:center;gap:8px;margin:9px 0;padding:10px 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