.converter-wrapper{max-width:800px}.category-tabs{display:flex;justify-content:center;gap:.75rem;flex-wrap:wrap;margin-bottom:2rem}.category-btn{padding:.75rem 1.25rem;border:2px solid var(--bi-border);border-radius:12px;background:var(--bi-surface);color:var(--bi-text-muted);font-weight:500;cursor:pointer;transition:all .3s ease;display:flex;align-items:center;gap:.5rem}.category-btn:hover{border-color:#3498db;color:#3498db;transform:translateY(-2px)}.category-btn.active{background:linear-gradient(135deg,var(--brand) 0%,var(--brand-strong) 100%);border-color:transparent;color:#fff;box-shadow:0 4px 15px rgba(var(--brand-rgb),.4)}.category-btn i{font-size:1.1rem}.converter-card{background:var(--bi-surface);border-radius:20px;padding:2rem;box-shadow:0 10px 40px #00000014;margin-bottom:1.5rem}.converter-section{display:flex;align-items:flex-end;gap:1rem;margin-bottom:1.5rem}.input-group-wrapper{flex:1}.input-label{display:block;font-size:.875rem;font-weight:500;color:var(--bi-text-muted);margin-bottom:.5rem}.converter-input{font-size:1.25rem;font-weight:600;padding:.875rem 1rem;border:2px solid var(--bi-border);border-radius:12px 0 0 12px}.converter-input:focus{border-color:var(--brand);box-shadow:0 0 0 .2rem rgba(var(--brand-rgb),.25)}.unit-select{min-width:120px;font-weight:500;border:2px solid var(--bi-border);border-left:none;border-radius:0 12px 12px 0;cursor:pointer}.unit-select:focus{border-color:var(--brand);box-shadow:0 0 0 .2rem rgba(var(--brand-rgb),.25)}.btn-swap{width:48px;height:48px;border-radius:50%;border:2px solid var(--bi-border);background:var(--bi-surface);color:var(--brand);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .3s ease;margin-bottom:0}.btn-swap:hover{background:linear-gradient(135deg,var(--brand) 0%,var(--brand-strong) 100%);border-color:transparent;color:#fff;transform:rotate(180deg)}.btn-swap i{font-size:1.25rem}.quick-actions{display:flex;gap:.75rem;margin-bottom:1.5rem;padding-bottom:1.5rem;border-bottom:1px solid var(--bi-border)}.quick-actions .btn{border-radius:10px;padding:.5rem 1rem;font-weight:500}.common-conversions{margin-bottom:1rem}.common-conversions h5{font-size:1rem;font-weight:600;color:var(--bi-text);margin-bottom:1rem}.common-conversions h5 i{margin-right:.5rem;color:#f39c12}.common-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:.75rem}.common-item{padding:.75rem 1rem;background:var(--bi-surface-2);border-radius:10px;cursor:pointer;transition:all .2s ease;text-align:center;font-size:.9rem;color:var(--bi-text)}.common-item:hover{background:linear-gradient(135deg,rgba(var(--brand-rgb),.08),rgba(var(--brand-strong-rgb),.08));color:var(--brand);transform:translateY(-2px)}.favorites-card{background:var(--bi-surface);border-radius:20px;padding:1.5rem;box-shadow:0 4px 20px #0000000d;margin-bottom:1.5rem}.favorites-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}.favorites-header h5{font-size:1rem;font-weight:600;color:var(--bi-text);margin:0}.favorites-header h5 i{margin-right:.5rem}.favorites-list{display:flex;flex-wrap:wrap;gap:.75rem}.favorite-item{display:flex;align-items:center;gap:.5rem;padding:.5rem 1rem;background:linear-gradient(135deg,#fff9e6,#fff5d6);border:1px solid #f0e0b0;border-radius:50px;cursor:pointer;transition:all .2s ease;font-size:.9rem}.favorite-item:hover{transform:translateY(-2px);box-shadow:0 4px 10px #0000001a}.favorite-item .favorite-name{font-weight:500;color:#856404}.favorite-item .favorite-delete{width:20px;height:20px;border-radius:50%;border:none;background:#0000001a;color:#856404;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:.75rem;opacity:0;transition:opacity .2s ease}.favorite-item:hover .favorite-delete{opacity:1}.favorite-item .favorite-delete:hover{background:#e74c3c;color:#fff}.empty-favorites{text-align:center;padding:1.5rem;color:#95a5a6;font-size:.9rem}.formula-card{background:linear-gradient(135deg,rgba(var(--brand-rgb),.03),rgba(var(--brand-strong-rgb),.03));border-radius:16px;padding:1.25rem;border:1px dashed rgba(var(--brand-rgb),.25)}.formula-card h5{font-size:.9rem;font-weight:600;color:var(--brand);margin-bottom:.75rem}.formula-card h5 i{margin-right:.5rem}.formula-display{font-family:Courier New,monospace;font-size:1rem;color:var(--bi-text);background:var(--bi-surface);padding:1rem;border-radius:10px;word-break:break-all}.modal-content{border-radius:20px;border:none}.modal-header{border-bottom:1px solid var(--bi-border);padding:1.5rem}.modal-title{font-weight:600;color:var(--bi-text)}.modal-title i{margin-right:.5rem;color:#f39c12}.modal-body{padding:1.5rem}.current-selection{background:var(--bi-surface-2);padding:1rem;border-radius:10px;margin-top:1rem}@media (max-width: 768px){.converter-section{flex-direction:column;align-items:stretch}.btn-swap{align-self:center;transform:rotate(90deg)}.btn-swap:hover{transform:rotate(270deg)}.category-tabs{gap:.5rem}.category-btn{padding:.625rem 1rem;font-size:.9rem}.converter-card{padding:1.5rem}.common-list{grid-template-columns:repeat(2,1fr)}}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.converter-card{animation:fadeIn .3s ease}html[data-theme=dark] .category-btn:hover{border-color:var(--brand);color:var(--brand)}html[data-theme=dark] .converter-card,html[data-theme=dark] .favorites-card{box-shadow:0 10px 40px #00000059;border:1px solid var(--bi-border)}html[data-theme=dark] .favorite-item{background:linear-gradient(135deg,#f39c1224,#f1c40f1a);border-color:#f39c1259}html[data-theme=dark] .favorite-item .favorite-name,html[data-theme=dark] .favorite-item .favorite-delete{color:#f0c674}html[data-theme=dark] .favorite-item .favorite-delete{background:#ffffff26}html[data-theme=dark] .favorite-item .favorite-delete:hover{background:#dc3545;color:#fff}html[data-theme=dark] .empty-favorites{color:var(--bi-text-muted)}