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var(--color-border)}.btn-icon:hover,.btn-icon.active{background-color:var(--color-electric-indigo);border-color:var(--color-electric-indigo);color:var(--color-text-light)}.tool-card{display:block;text-decoration:none;color:inherit;background:var(--color-background);border-radius:var(--radius-card);box-shadow:var(--shadow-card);padding:var(--spacing-xl);transition:all var(--transition-normal);border:2px solid transparent}.tool-card:hover{box-shadow:var(--shadow-hover);border-color:var(--color-electric-indigo);transform:translateY(-4px)}.tool-card h3{margin-bottom:var(--spacing-sm)}.tool-card p{color:var(--color-text-secondary);font-size:var(--font-size-small)}.category-section{margin-bottom:var(--spacing-xxl)}.category-title{font-size:var(--font-size-label);font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:var(--color-electric-indigo);margin-bottom:var(--spacing-lg);padding-bottom:var(--spacing-sm);border-bottom:2px solid var(--color-border)}main{flex:1;padding-bottom:2rem;padding-top:var(--spacing-xxl)}.result-box{background:linear-gradient(135deg,var(--color-deep-teal) 0%,color-mix(in srgb,var(--color-deep-teal) 70%,black) 100%);border-radius:var(--radius-card);padding:var(--spacing-xl);color:var(--color-text-light);text-align:center}.result-value{font-size:2.5rem;font-weight:800;margin-bottom:var(--spacing-xs)}.result-label{font-size:var(--font-size-small);opacity:.8;text-transform:uppercase;letter-spacing:.05em}.result-formula{margin-top:var(--spacing-md);padding-top:var(--spacing-md);border-top:1px solid 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