.length-converter{display:flex;justify-content:center;align-items:center;min-height:100vh;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;transition:all .3s ease}.length-converter.light{background-color:#f5f7fa;color:#333}.length-converter.dark{background-color:#2d3748;color:#e2e8f0}.length-converter .converter-container{width:100%;max-width:500px;padding:2rem;border-radius:10px;box-shadow:0 4px 15px rgba(0,0,0,.1)}.light .length-converter .converter-container{background-color:#fff;border:1px solid #e2e8f0}.dark .length-converter .converter-container{background-color:#1a202c;border:1px solid #4a5568}.length-converter .converter-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem}.length-converter .converter-header h1{font-size:1.75rem;font-weight:600;margin:0}.length-converter .converter-header .theme-toggle{background:none;border:none;font-size:1.5rem;cursor:pointer;padding:5px;border-radius:50%;display:flex;align-items:center;justify-content:center}.light .length-converter .converter-header .theme-toggle{background-color:#f8fafc;color:#333}.light .length-converter .converter-header .theme-toggle:hover{background-color:#e2e8f0}.dark .length-converter .converter-header .theme-toggle{background-color:#4a5568;color:#f7fafc}.dark .length-converter .converter-header .theme-toggle:hover{background-color:#2d3748}.length-converter .input-group{margin-bottom:1.5rem}.length-converter .input-group label{display:block;margin-bottom:.5rem;font-weight:500}.length-converter .input-group input{width:100%;padding:.75rem;border-radius:8px;font-size:1rem;transition:border .3s ease;outline:none}.light .length-converter .input-group input{border:1px solid #cbd5e0;background-color:#fff;color:#1a202c}.light .length-converter .input-group input:focus{border-color:#4299e1;box-shadow:0 0 0 3px rgba(66,153,225,.2)}.dark .length-converter .input-group input{border:1px solid #4a5568;background-color:#2d3748;color:#e2e8f0}.dark .length-converter .input-group input:focus{border-color:#4299e1;box-shadow:0 0 0 3px rgba(66,153,225,.3)}.length-converter .unit-selectors{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem}.length-converter .unit-selectors .selector-group{flex:1}.length-converter .unit-selectors .selector-group label{display:block;margin-bottom:.5rem;font-weight:500}.length-converter .unit-selectors .selector-group select{width:100%;padding:.75rem;border-radius:8px;font-size:1rem;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right .75rem center;background-size:1rem;outline:none}.light .length-converter .unit-selectors .selector-group select{border:1px solid #cbd5e0;background-color:#fff;color:#1a202c}.light .length-converter .unit-selectors .selector-group select:focus{border-color:#4299e1;box-shadow:0 0 0 3px rgba(66,153,225,.2)}.dark .length-converter .unit-selectors .selector-group select{border:1px solid #4a5568;background-color:#2d3748;color:#e2e8f0}.dark .length-converter .unit-selectors .selector-group select:focus{border-color:#4299e1;box-shadow:0 0 0 3px rgba(66,153,225,.3)}.length-converter .unit-selectors .swap-button{margin:1.75rem 1rem 0;width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.25rem;cursor:pointer;transition:all .2s ease}.light .length-converter .unit-selectors .swap-button{background-color:#edf2f7;color:#4a5568;border:1px solid #cbd5e0}.light .length-converter .unit-selectors .swap-button:hover{background-color:#e2e8f0;transform:rotate(180deg)}.dark .length-converter .unit-selectors .swap-button{background-color:#4a5568;color:#e2e8f0;border:1px solid #2d3748}.dark .length-converter .unit-selectors .swap-button:hover{background-color:#2d3748;transform:rotate(180deg)}.length-converter .result-container{background-color:rgba(66,153,225,.1);padding:1.25rem;border-radius:8px;margin-bottom:1.5rem;display:flex;flex-direction:column;align-items:center}.light .length-converter .result-container{border:1px solid rgba(66,153,225,.2)}.dark .length-converter .result-container{border:1px solid rgba(66,153,225,.3)}.length-converter .result-container .result-label{font-weight:500;margin-bottom:.5rem;font-size:.875rem;opacity:.8}.length-converter .result-container .result-value{font-size:2rem;font-weight:700;margin-bottom:.25rem}.light .length-converter .result-container .result-value{color:#2b6cb0}.dark .length-converter .result-container .result-value{color:#63b3ed}.length-converter .result-container .result-unit{font-size:1rem;opacity:.8}.length-converter .conversion-formula{text-align:center;padding:.75rem;border-radius:8px;font-size:.875rem}.light .length-converter .conversion-formula{background-color:#f7fafc;border:1px solid #edf2f7}.dark .length-converter .conversion-formula{background-color:#2d3748;border:1px solid #4a5568}.length-converter .conversion-formula p{margin:0}@media screen and (max-width:600px){.length-converter{padding:1rem}.length-converter .converter-container{padding:1.25rem}.length-converter .unit-selectors{flex-direction:column}.length-converter .unit-selectors .selector-group{width:100%;margin-bottom:1rem}.length-converter .unit-selectors .swap-button{margin:.5rem auto;transform:rotate(90deg)}.length-converter .unit-selectors .swap-button:hover{transform:rotate(270deg)!important}.length-converter .result-container .result-value{font-size:1.5rem}}