.mode-toggle-wrap{display:flex;justify-content:center;margin-bottom:32px}.mode-tabs{display:flex;background:var(--bg-card);border:1px solid var(--border);padding:4px;border-radius:12px;box-shadow:var(--shadow-sm)}.mode-tabs button{padding:10px 24px;border-radius:8px;border:none;background:transparent;color:var(--text-secondary);font-size:.9rem;font-weight:600;cursor:pointer;transition:all var(--transition)}.mode-tabs button:hover{color:var(--text-primary)}.mode-tabs button.active{background:var(--bg-elevated);color:var(--accent);box-shadow:var(--shadow-sm)}.b64-textarea{width:100%;height:180px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-md);padding:16px;color:var(--text-primary);font-family:var(--font-mono);font-size:.8rem;line-height:1.6;resize:none;outline:none;transition:all var(--transition)}.b64-textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-dim)}.b64-textarea.output{background:var(--bg-input);cursor:default}.b64-actions{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}.btn-ghost{background:transparent;border:1px solid var(--border);color:var(--text-secondary);padding:6px 12px;border-radius:6px;font-size:.8rem;font-weight:600;cursor:pointer;transition:all var(--transition)}.btn-ghost:hover{background:var(--bg-hover);color:var(--text-primary);border-color:var(--accent)}.empty-state-msg{display:flex;align-items:center;justify-content:center;height:100%;min-height:200px;color:var(--text-muted);font-style:italic;text-align:center;padding:24px}.converter-input-stack,.encode-output-wrap,.decode-input-wrap,.decode-result-wrap{display:flex;flex-direction:column;gap:20px}.result-actions-grid{display:grid;grid-template-columns:1fr auto;gap:20px;align-items:center}.btn-sm{padding:8px 16px;font-size:.8rem}@media (max-width: 992px){.base64-page .tool-grid{display:flex;flex-direction:column;align-items:stretch!important;gap:24px;width:100%}.result-actions{grid-template-columns:1fr;gap:24px}}@media (max-width: 768px){.result-actions-grid{grid-template-columns:1fr}}@media (max-width: 640px){.base64-page .tool-grid{width:100%;margin:0}.panel-body{padding:20px 14px!important}}.input-type-tabs{display:flex;gap:12px;margin:4px 0 24px}.input-type-tabs button{padding:8px 16px;border-radius:8px;border:1px solid var(--border);background:var(--bg-surface);color:var(--text-secondary);font-size:.85rem;font-weight:600;cursor:pointer;transition:all var(--transition)}.input-type-tabs button:hover{border-color:var(--accent);color:var(--text-primary)}.input-type-tabs button.active{background:var(--accent);color:#fff!important;border-color:var(--accent);box-shadow:0 4px 12px var(--accent-dim)}.preview-wrap{display:flex;flex-direction:column;gap:16px}.file-encoded-msg{display:flex;align-items:center;justify-content:center;height:120px;color:var(--accent);font-weight:700;font-size:1.1rem;text-transform:uppercase;letter-spacing:1px;border:1px dashed var(--border);border-radius:var(--radius-md);background:var(--bg-surface)}.image-result,.text-result{display:flex;flex-direction:column;gap:16px}.pro-toggle-container{display:flex;align-items:center;gap:12px;cursor:pointer;-webkit-user-select:none;user-select:none;padding:4px 0}.pro-toggle-switch{width:42px;height:22px;background:var(--border);border-radius:99px;position:relative;transition:all .3s cubic-bezier(.4,0,.2,1)}.pro-toggle-switch.active{background:var(--accent)}.pro-toggle-handle{width:16px;height:16px;background:#fff;border-radius:50%;position:absolute;top:3px;left:3px;transition:all .3s cubic-bezier(.4,0,.2,1);box-shadow:0 2px 4px #0000001a}.pro-toggle-switch.active .pro-toggle-handle{transform:translate(20px)}.pro-toggle-label{font-size:.85rem;font-weight:600;color:var(--text-secondary)}.pro-toggle-container:hover .pro-toggle-label{color:var(--text-primary)}.no-preview-msg{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:40px 20px;text-align:center;background:var(--bg-surface);border-radius:var(--radius-md);min-height:200px;border:1px dashed var(--border)}.file-type-icon{font-size:3rem;margin-bottom:16px;filter:drop-shadow(0 4px 12px var(--shadow-color))}.no-preview-msg p{font-weight:700;color:var(--text-primary);margin-bottom:8px;font-size:1.1rem}.no-preview-msg span{color:var(--text-secondary);font-size:.9rem}.text-encode-stack,.file-preview-stack{display:flex;flex-direction:column;gap:16px}.file-info-card{display:flex;align-items:center;gap:16px;padding:16px;background:var(--bg-surface);border:1px solid var(--border);border-radius:var(--radius-md);position:relative}.file-icon{font-size:1.5rem;background:var(--bg-elevated);width:48px;height:48px;display:flex;align-items:center;justify-content:center;border-radius:8px}.file-details{flex:1;overflow:hidden}.file-name{font-weight:600;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:.9rem}.file-size{font-size:.8rem;color:var(--text-secondary)}.remove-btn{background:transparent;border:none;color:var(--text-secondary);font-size:1.2rem;cursor:pointer;padding:4px 8px;transition:all var(--transition)}.remove-btn:hover{color:var(--error);transform:scale(1.1)}