#tool-wrapper {
    max-width: 800px;
    margin: 80px auto 40px;
    padding: 30px;
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.dark-mode #tool-wrapper { background: #2c3e50; }
#tool-wrapper h1 { text-align: center; color: #2c3e50; margin-bottom: 30px; }
.dark-mode #tool-wrapper h1 { color: #ecf0f1; }
textarea { width: 100%; height: 150px; padding: 15px; font-size: 14px; font-family: monospace; border: 2px solid #3498db; border-radius: 8px; resize: vertical; background: #f8f9fa; color: #2c3e50; }
.dark-mode textarea { background: #1a252f; color: #ecf0f1; }
textarea:focus { outline: none; border-color: #2980b9; }
.input-section, .output-section { margin-bottom: 20px; }
.actions { display: flex; gap: 15px; justify-content: center; margin-bottom: 20px; }
.actions button, .copy-actions button { padding: 12px 30px; font-size: 16px; font-weight: bold; border: none; border-radius: 8px; cursor: pointer; transition: all 0.3s; }
#encode-btn, #copy-btn { background: #2ecc71; color: white; }
#encode-btn:hover, #copy-btn:hover { background: #27ae60; }
#decode-btn, #clear-btn { background: #3498db; color: white; }
#decode-btn:hover, #clear-btn:hover { background: #2980b9; }
.copy-actions { display: flex; gap: 15px; justify-content: center; }