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768px){.grid-row-premium{grid-template-columns:1fr}}.text-center-premium{text-align:center!important}.mx-auto-premium{margin-left:auto!important;margin-right:auto!important}.option-card{display:flex;align-items:center;gap:var(--space-md);padding:var(--space-md);background:var(--bg-secondary);border:1px solid var(--border-light);border-radius:var(--radius-lg);cursor:pointer;transition:all var(--duration-fast) var(--ease-out)}.option-card:hover{border-color:var(--border-hover);transform:translateY(-2px);box-shadow:var(--shadow-sm)}.option-card.is-selected{background:var(--bg-primary);border-color:var(--accent-primary);box-shadow:0 0 0 1px var(--accent-primary)}.option-card input[type=radio],.option-card input[type=checkbox]{accent-color:var(--accent-primary);width:1.25rem;height:1.25rem}.option-card .option-content{display:flex;flex-direction:column}.option-card strong{font-weight:600;color:var(--text-primary);font-size:.9375rem}.option-card 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.label{display:block;font-size:.75rem;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:var(--space-xs)}.detail-item .value{font-weight:600;font-size:1.125rem;color:var(--text-primary);line-height:1.4}@media (max-width: 640px){.details-grid{grid-template-columns:1fr;gap:var(--space-md)}}.input-group label{display:block;margin-bottom:var(--space-xs);font-weight:500;font-size:.875rem;color:var(--text-secondary)}.input-group small{display:block;margin-top:4px;color:var(--text-muted);font-size:.8125rem}.formula-note{margin-top:var(--space-lg);font-size:.875rem;color:var(--text-muted);font-style:italic}.input-stats{display:flex;gap:var(--space-lg);margin-top:var(--space-sm);font-size:.8125rem;color:var(--text-muted)}.card{background:var(--bg-secondary);border:1px solid var(--border-light);border-radius:var(--radius-lg);padding:var(--space-lg);box-shadow:var(--shadow-sm)}.tool-section{max-width:720px;margin:0 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12px;display:flex;align-items:center;gap:6px;background:var(--bg-subtle);border:1px solid var(--border-light);border-radius:var(--radius-sm);color:var(--text-muted);font-size:.75rem;font-weight:500;cursor:pointer;transition:all var(--duration-fast) var(--ease-out)}.copy-btn:hover{background:var(--accent-primary);border-color:var(--accent-primary);color:#fff}.copy-btn.is-copied{background:#10b981;border-color:#10b981;color:#fff}.copy-btn .icon{width:14px;height:14px}.copy-mini{padding:4px 10px;background:var(--bg-subtle);border:1px solid var(--border-light);border-radius:var(--radius-sm);color:var(--text-muted);font-size:.625rem;font-weight:500;cursor:pointer;transition:all var(--duration-fast)}.copy-mini:hover{background:var(--accent-primary);border-color:var(--accent-primary);color:#fff}.output-box{position:relative}.search-input-group{position:relative;width:100%}.search-input-group .form-input{padding-left:3.5rem}.search-input-group .search-icon{position:absolute;left:1.25rem;top:50%;transform:translateY(-50%);color:var(--text-muted);pointer-events:none;display:flex;align-items:center;justify-content:center;z-index:10}.search-input-group .search-icon svg{width:20px;height:20px}.action-btn{padding:6px 12px;background:var(--bg-secondary);border:1px solid var(--border-light);border-radius:var(--radius-sm);color:var(--text-secondary);font-size:.6875rem;font-weight:500;cursor:pointer;transition:all var(--duration-fast) var(--ease-out)}.action-btn:hover{background:var(--accent-primary);border-color:var(--accent-primary);color:#fff}.error-message{margin-top:var(--space-md);padding:var(--space-md);background:#fef2f2;border:1px solid #fecaca;border-radius:var(--radius-md);color:#dc2626;font-family:var(--font-mono);font-size:.8125rem;display:none}.error-message.is-visible{display:block}.toast{position:fixed;bottom:var(--space-xl);left:50%;transform:translate(-50%) translateY(20px);padding:var(--space-sm) var(--space-lg);background:var(--text-primary);border-radius:var(--radius-md);color:#fff;font-size:.875rem;font-weight:500;opacity:0;transition:all var(--duration-normal) var(--ease-out);z-index:1000;box-shadow:var(--shadow-lg)}.toast.is-visible{opacity:1;transform:translate(-50%) translateY(0)}.toast-success{background:#059669}.toast-warning{background:#f59e0b}.toast-error{background:#dc2626}.help-section{max-width:600px;margin:var(--space-2xl) auto 0;padding:0 var(--space-md);color:var(--text-secondary)}.help-section h3{font-size:1rem;font-weight:600;color:var(--text-primary);margin-bottom:var(--space-md);text-align:center}.help-section ol,.help-section ul{padding-left:var(--space-lg);margin:0}.help-section li{margin-bottom:var(--space-xs);line-height:1.6;font-size:.9375rem}.help-section p{font-size:.9375rem;line-height:1.6;margin-bottom:var(--space-md);text-align:center}.related-tools-section{padding:var(--space-2xl) var(--space-md);border-top:1px solid var(--border-light)}.related-tools-container{max-width:800px;margin:0 auto}.related-tools-title{font-size:1rem;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:var(--space-lg);text-align:center}.related-tools-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--space-md)}.related-tool-card{display:flex;align-items:center;gap:var(--space-md);padding:var(--space-md) var(--space-lg);background:var(--bg-secondary);border:1px solid var(--border-light);border-radius:var(--radius-lg);text-decoration:none;transition:all var(--duration-fast) var(--ease-out)}.related-tool-card:hover{border-color:var(--accent-primary);box-shadow:0 4px 12px #00000014;transform:translateY(-2px)}.related-tool-icon{font-size:1.5rem;flex-shrink:0;width:40px;height:40px;display:flex;align-items:center;justify-content:center;background:var(--bg-subtle);border-radius:var(--radius-md)}.related-tool-info{display:flex;flex-direction:column;gap:2px;min-width:0}.related-tool-name{font-size:.875rem;font-weight:600;color:var(--text-primary)}.related-tool-desc{font-size:.75rem;color:var(--text-muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}@media (max-width: 640px){.related-tools-grid{grid-template-columns:1fr}}.resources-hero,.category-hero{text-align:center;padding:var(--space-2xl) var(--space-md);background:linear-gradient(to bottom,var(--accent-light),transparent);border-bottom:1px solid var(--border-light);margin-bottom:var(--space-2xl)}.resources-hero h1,.category-hero 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h2{font-size:1.2rem;margin-bottom:1rem}.modal .form-group{margin-bottom:1rem}.modal .form-group label{display:block;font-size:.85rem;font-weight:600;margin-bottom:.35rem;color:var(--text-secondary)}.modal-actions{display:flex;gap:.75rem;justify-content:flex-end;margin-top:1.5rem}.badge{display:inline-flex;align-items:center;padding:.2rem .6rem;border-radius:999px;font-size:.75rem;font-weight:600}.badge-success{background:#dcfce7;color:#166534}.badge-warning{background:#fef9c3;color:#854d0e}.badge-danger{background:#fee2e2;color:#991b1b}.badge-info{background:#dbeafe;color:#1e40af}@media (max-width: 640px){.tools-grid{grid-template-columns:1fr}}