.base64-encoder{min-height:100vh;display:flex;flex-direction:column;align-items:center;padding:2rem 1rem;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;color:#333;background-color:#f5f7fa}.base64-encoder .container{width:100%;max-width:800px;margin:0 auto;background-color:#fff;border-radius:12px;box-shadow:0 4px 16px rgba(0,0,0,.1);padding:2rem}@media(max-width:768px){.base64-encoder .container{padding:1.5rem}}@media(max-width:480px){.base64-encoder .container{padding:1rem}}.base64-encoder h1{text-align:center;margin-bottom:1rem;color:#2c3e50;font-size:2.5rem}@media(max-width:768px){.base64-encoder h1{font-size:2rem}}@media(max-width:480px){.base64-encoder h1{font-size:1.75rem}}.base64-encoder .description{text-align:center;margin-bottom:2rem;color:#5f6368;line-height:1.5}.base64-encoder .input-section,.base64-encoder .output-section{margin-bottom:1.5rem}.base64-encoder label{display:block;margin-bottom:.5rem;font-weight:500;color:#2c3e50}.base64-encoder textarea{width:100%;padding:1rem;border:1px solid #ddd;border-radius:8px;resize:vertical;font-family:inherit;font-size:1rem;background-color:#f9f9f9;transition:border-color .3s ease,box-shadow .3s ease}.base64-encoder textarea:focus{outline:none;border-color:#1a73e8;box-shadow:0 0 0 2px rgba(26,115,232,.2)}.base64-encoder textarea::placeholder{color:#aaa}.base64-encoder .button-group{display:flex;gap:1rem;margin-bottom:1.5rem}@media(max-width:480px){.base64-encoder .button-group{flex-direction:column}}.base64-encoder .clear-button,.base64-encoder .process-button{flex:1;padding:.75rem 1.5rem;border:none;border-radius:8px;cursor:pointer;font-weight:500;transition:all .3s ease}.base64-encoder .clear-button:focus,.base64-encoder .process-button:focus{outline:none;box-shadow:0 0 0 2px rgba(0,0,0,.2)}.base64-encoder .process-button{background-color:#1a73e8;color:#fff}.base64-encoder .process-button:hover{background-color:#1558b5}.base64-encoder .clear-button{background-color:#f1f3f4;color:#5f6368}.base64-encoder .clear-button:hover{background-color:#ddd}.base64-encoder .output-container{position:relative}.base64-encoder .copy-button{position:absolute;top:.5rem;right:.5rem;padding:.5rem 1rem;background-color:hsla(0,0%,100%,.8);border:1px solid #ddd;border-radius:4px;cursor:pointer;transition:all .3s ease;font-size:.875rem}.base64-encoder .copy-button:hover{background-color:#f1f3f4}.base64-encoder .copy-button:focus{outline:none;box-shadow:0 0 0 2px rgba(0,0,0,.1)}.base64-encoder .error-message{margin-bottom:1.5rem;padding:.75rem;background-color:#ffebee;color:#c62828;border-radius:8px;border-left:4px solid #c62828}.base64-encoder .info-section{margin-top:2rem;padding-top:1.5rem;border-top:1px solid #eee}.base64-encoder .info-section h2{margin-bottom:1rem;font-size:1.25rem;color:#2c3e50}.base64-encoder .info-section ul{padding-left:1.5rem;margin-bottom:1rem}.base64-encoder .info-section li{margin-bottom:.5rem;line-height:1.5}.base64-encoder footer{margin-top:2rem;text-align:center;color:#5f6368;font-size:.875rem}