.base64-container{max-width:90vw;width:900px;margin:2rem auto;padding:2.5rem;background:var(--bg-primary);border-radius:var(--radius);box-shadow:var(--shadow-lg);text-align:center;position:relative;overflow:hidden;border:1px solid var(--border-color)}.base64-header{margin-bottom:2rem}.base64-title{display:flex;align-items:center;justify-content:center;gap:1vw;font-size:2rem;font-weight:700;margin-bottom:15px}.title-icon{color:var(--primary);filter:drop-shadow(0 2px 4px rgba(0,0,0,.1))}.letters-div{display:flex}.letter{opacity:0;transform:translateY(10px);display:inline-block;animation:fadeInUp .4s forwards;color:var(--primary);font-size:2rem;font-weight:700;letter-spacing:.05em;text-shadow:0 2px 4px rgba(0,0,0,.1)}@keyframes fadeInUp{to{opacity:1;transform:translateY(0)}}.letter:nth-child(1){animation-delay:0s}.letter:nth-child(2){animation-delay:.05s}.letter:nth-child(3){animation-delay:.1s}.letter:nth-child(4){animation-delay:.15s}.letter:nth-child(5){animation-delay:.2s}.letter:nth-child(6){animation-delay:.25s}.letter:nth-child(7){animation-delay:.3s}.letter:nth-child(8){animation-delay:.35s}.letter:nth-child(9){animation-delay:.4s}.letter:nth-child(10){animation-delay:.45s}.letter:nth-child(11){animation-delay:.5s}.letter:nth-child(12){animation-delay:.55s}.letter:nth-child(13){animation-delay:.6s}.letter:nth-child(14){animation-delay:.65s}.letter:nth-child(15){animation-delay:.7s}.letter:nth-child(16){animation-delay:.75s}.base64-description{color:var(--text-secondary);font-size:1.1rem;max-width:600px;margin:0 auto}.converter-content{max-width:900px;margin:0 auto}.mode-selector{display:flex;justify-content:center;gap:1rem;margin-bottom:2rem}.mode-button{display:flex;align-items:center;gap:.5rem;padding:.75rem 1.5rem;border:none;border-radius:var(--radius);background:var(--bg-secondary);color:var(--text-primary);font-weight:500;cursor:pointer;transition:all .2s ease}.mode-button:hover{background:var(--border-color);transform:translateY(-2px)}.mode-button.active{background:var(--primary);color:#fff}.converter-boxes{display:grid;grid-template-columns:1fr auto 1fr;gap:1rem;align-items:start;margin-bottom:2rem}.input-box,.output-box{background:var(--bg-secondary);border-radius:var(--radius);padding:1rem;border:1px solid var(--border-color)}.box-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}.box-header h3{font-size:1.1rem;font-weight:600;color:var(--text-primary)}.clear-button,.copy-button{display:flex;align-items:center;gap:.5rem;padding:.5rem 1rem;border:none;border-radius:var(--radius);background:var(--bg-primary);color:var(--text-primary);font-weight:500;cursor:pointer;transition:all .2s ease}.clear-button:hover,.copy-button:hover{background:var(--border-color);transform:translateY(-2px)}.copy-button:active{transform:translateY(0);background:var(--primary);color:#fff}.copy-button.copied{background:var(--color-success);color:#fff;border-color:var(--color-success)}.copy-button:disabled{opacity:.5;cursor:not-allowed}.converter-textarea{width:100%;height:200px;padding:1rem;border:2px solid var(--border-color);border-radius:var(--radius);font-family:Inter,monospace;font-size:1rem;resize:vertical;background:var(--bg-primary);color:var(--text-primary);transition:all .2s ease}.converter-textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #6366f11a}.swap-button-container{display:flex;align-items:center;justify-content:center}.swap-button{width:48px;height:48px;border:none;border-radius:50%;background:var(--bg-secondary);color:var(--text-primary);cursor:pointer;transition:all .2s ease;display:flex;align-items:center;justify-content:center}.swap-button:hover{background:var(--border-color);transform:rotate(180deg)}.error-message{text-align:center;color:var(--color-error);margin-bottom:1rem;padding:.75rem;background:#ef44441a;border-radius:var(--radius);border:1px solid var(--color-error)}.action-buttons{display:flex;justify-content:center;gap:1rem}.convert-button{display:flex;align-items:center;gap:.5rem;padding:.75rem 2rem;border:none;border-radius:var(--radius);background:var(--primary);color:#fff;font-weight:500;cursor:pointer;transition:all .2s ease}.convert-button:hover{background:var(--primary-hover);transform:translateY(-2px)}@media(max-width:768px){.base64-container{margin:1rem auto;padding:1.5rem}.base64-title,.letter{font-size:1.5rem}.converter-boxes{grid-template-columns:1fr;gap:1rem}.swap-button-container{margin:1rem 0}.swap-button{transform:rotate(90deg)}.swap-button:hover{transform:rotate(270deg)}}@media(max-width:480px){.base64-container{padding:1rem}.base64-title,.letter{font-size:1.25rem}.base64-description{font-size:1rem}}