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.mode-btn:hover,.base64-tool .type-btn:hover{border-color:var(--primary-color)}.base64-tool .mode-btn.active{background:var(--primary-color);color:#fff;border-color:var(--primary-color)}.base64-tool .type-btn.active{background:var(--bg-tertiary);border-color:var(--text-secondary)}.base64-tool .type-btn:disabled{opacity:.5;cursor:not-allowed}.base64-tool .options{margin-left:auto}.base64-tool .checkbox-label{display:flex;align-items:center;gap:.5rem;cursor:pointer;font-size:1rem;color:var(--gray-900)}.base64-tool .checkbox-label input{width:18px;height:18px;cursor:pointer}.base64-tool .sample-buttons{display:flex;align-items:center;gap:.75rem;margin-bottom:1.5rem;flex-wrap:wrap}.base64-tool .sample-buttons span{color:var(--text-secondary);font-size:.875rem}.base64-tool .sample-buttons button{padding:.5rem 1rem;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:6px;cursor:pointer;font-size:.85rem;color:var(--text-primary);transition:all .2s}.base64-tool .sample-buttons button:hover{background:var(--bg-tertiary);border-color:var(--border-dark)}.base64-tool .editor-container{display:grid;grid-template-columns:1fr auto 1fr;gap:1rem;margin-bottom:1.5rem}.base64-tool .editor-pane{display:flex;flex-direction:column}.base64-tool .pane-header{display:flex;justify-content:space-between;align-items:center;padding:.75rem 1rem;background:var(--bg-secondary);border-radius:8px 8px 0 0;font-weight:500;color:var(--text-primary)}.base64-tool .char-count{font-size:.85rem;color:var(--text-tertiary);font-weight:400}.base64-tool .editor-pane textarea{width:100%;height:300px;padding:1rem;border:1px solid var(--border-color);border-top:none;border-radius:0 0 8px 8px;font-family:Courier New,monospace;font-size:.875rem;resize:vertical;line-height:1.6;background:var(--bg-primary);color:var(--text-primary)}.base64-tool .editor-pane textarea:focus{outline:none;border-color:var(--primary-color)}.base64-tool .editor-pane 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.file-label.is-loading{cursor:default;pointer-events:none}.base64-tool .file-label.is-dragging{transform:scale(1.02)}.base64-tool .drop-indicator{color:var(--primary-color);font-weight:500}.base64-tool .drop-indicator .upload-icon{animation:bounce .5s ease infinite alternate}@keyframes bounce{0%{transform:translateY(0)}to{transform:translateY(-10px)}}.base64-tool .size-warning{margin-top:1rem;padding:.75rem 1rem;background:#fff3cd;border:1px solid #ffc107;border-radius:6px;color:#856404;font-size:.875rem;display:flex;align-items:center;gap:.5rem}.base64-tool .size-warning .warning-icon{font-size:1.1rem}.base64-tool .loading-indicator{display:flex;flex-direction:column;align-items:center;gap:1rem;color:var(--primary, #3B82F6);font-weight:500}.base64-tool .upload-icon{font-size:3rem;margin-bottom:1rem}.base64-tool .file-hint{font-size:.85rem;color:var(--text-muted);margin-top:.5rem}.base64-tool .file-info{margin-top:1.5rem;padding:1rem;background:var(--bg-secondary);border-radius:8px;display:flex;flex-direction:column;gap:.25rem}.base64-tool .file-info strong{color:var(--primary-color)}.base64-tool .file-info span{font-size:.85rem;color:var(--text-secondary)}.base64-tool .error-message{display:flex;align-items:center;gap:.5rem;padding:1rem;background:#fff3cd;border:1px solid #ffc107;border-radius:8px;color:#856404;margin-bottom:1.5rem}.base64-tool .error-icon{font-size:1.2rem}.base64-tool .action-buttons{display:flex;gap:1rem;margin-bottom:2rem;flex-wrap:wrap}.base64-tool .action-btn{padding:.75rem 1.5rem;border:1px solid var(--border-color);background:var(--bg-primary);border-radius:8px;cursor:pointer;font-weight:500;color:var(--text-primary);transition:all .2s}.base64-tool .action-btn:hover:not(:disabled){background:var(--bg-secondary)}.base64-tool .action-btn.primary{background:var(--primary-color);color:#fff;border-color:var(--primary-color)}.base64-tool 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.stats-section{margin-bottom:2rem}.base64-tool .stats-section h3{margin-bottom:1rem;color:var(--primary-color)}.base64-tool .stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:1rem}.base64-tool .stat-item{background:var(--bg-secondary);padding:1rem;border-radius:8px;text-align:center}.base64-tool .stat-label{display:block;font-size:.85rem;color:var(--text-secondary);margin-bottom:.5rem}.base64-tool .stat-value{font-size:1.25rem;font-weight:600;color:var(--primary-color)}.base64-tool .history-section{margin-bottom:2rem}.base64-tool .history-section h3{margin-bottom:1rem;color:var(--primary-color)}.base64-tool .history-list{display:flex;flex-direction:column;gap:.5rem}.base64-tool .history-item{display:flex;align-items:center;gap:1rem;padding:.75rem 1rem;background:var(--bg-secondary);border-radius:6px;cursor:pointer;transition:background .2s}.base64-tool .history-item:hover{background:var(--bg-tertiary)}.base64-tool .history-mode{padding:.25rem .5rem;border-radius:4px;font-size:.75rem;font-weight:600}.base64-tool .history-mode.encode{background:#d4edda;color:#155724}.base64-tool .history-mode.decode{background:#cce5ff;color:#004085}.base64-tool .history-preview{flex:1;font-family:Courier New,monospace;font-size:.85rem;color:var(--text-secondary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.base64-tool .history-time{font-size:.8rem;color:var(--text-tertiary)}.base64-tool .feature-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1.5rem;margin-bottom:2rem}.base64-tool .feature-card{background:var(--bg-secondary);padding:1.5rem;border-radius:8px;text-align:center}.base64-tool .feature-card h4{color:var(--primary-color);margin-bottom:.5rem}.base64-tool .feature-card p{color:var(--text-secondary);font-size:.875rem;line-height:1.6}.base64-tool .tips-section{background:var(--bg-secondary);border-radius:8px;padding:1.5rem;margin-bottom:2rem}.base64-tool .tips-section h3{color:var(--primary-color);margin-bottom:1rem}.base64-tool .tips-section ul{list-style:none;padding:0;margin:0}.base64-tool .tips-section li{padding:.5rem 0;color:var(--text-secondary);line-height:1.6}.base64-tool .tips-section li strong{color:var(--primary-color)}.base64-tool .tips-section code{background:var(--bg-primary);padding:.2rem .5rem;border-radius:4px;font-size:.85rem;color:var(--text-primary)}.base64-tool .cta-section{background:linear-gradient(135deg,var(--primary-color),var(--primary-dark));color:#fff;padding:2rem;border-radius:12px;text-align:center}.base64-tool .cta-section h3{margin-bottom:.5rem}.base64-tool .cta-section p{opacity:.9;margin-bottom:1.5rem}.base64-tool .cta-button{display:inline-block;padding:.75rem 2rem;background:#fff;color:var(--primary-color);text-decoration:none;border-radius:8px;font-weight:600;transition:transform .2s}.base64-tool .cta-button:hover{transform:translateY(-2px)}@media (max-width: 768px){.base64-tool,.base64-tool .tool-content{padding:1rem}.base64-tool .controls-section h3{font-size:1.15rem;font-weight:700;color:var(--gray-900);margin-bottom:1.25rem;padding-bottom:.75rem;border-bottom:2px solid var(--primary);letter-spacing:.03em}.controls-section{flex-direction:column;align-items:stretch}.base64-tool .mode-selector,.base64-tool .input-type-selector{justify-content:center}.base64-tool .options{margin-left:0;text-align:center}.base64-tool .editor-container{grid-template-columns:1fr}.base64-tool .swap-button-container{transform:rotate(90deg)}.base64-tool .sample-buttons,.base64-tool .action-buttons{justify-content:center}.base64-tool .data-uri-box{flex-direction:column}}@media print{.base64-tool .controls-section,.base64-tool .sample-buttons,.base64-tool .action-buttons,.base64-tool .history-section,.base64-tool .cta-section{display:none}.controls-section:last-child{margin-bottom:0;padding-bottom:0;border-bottom:none}}