.settings-panel { background: var(--card-bg); flex: 1; padding: 25px; border-radius: var(--radius); box-shadow: 0 4px 12px rgba(0,0,0,0.08); border: 1px solid var(--border-color); }
       
        .control-group { margin-bottom: 15px; }
        .control-group label { display: block; margin-bottom: 6px; font-weight: 600; font-size: 0.85rem; color: var(--text-main); }
        .text-input, .select-input { width: 100%; padding: 10px; border: 1px solid var(--border-color); border-radius: 8px; font-size: 0.9rem; background: #fafafa; }
        .text-input:focus, .select-input:focus { outline: 2px solid var(--primary-color); background: #fff; }

        .action-btn { width: 100%; background-color: var(--primary-color); color: white; border: none; border-radius: 8px; padding: 12px; font-size: 1rem; font-weight: 600; cursor: pointer; transition: background-color 0.2s; margin-top: 10px; }
        .action-btn:hover { background-color: var(--primary-hover); }
        
        .preview-panel { background: #fff; flex: 1; padding: 25px; border-radius: var(--radius); box-shadow: 0 4px 12px rgba(0,0,0,0.08); border: 1px solid var(--border-color); display: flex; flex-direction: column; justify-content: center; }
        
        .email-list { display: flex; flex-direction: column; gap: 10px; margin-top: 15px; }
        .email-item { display: flex; justify-content: space-between; align-items: center; padding: 10px 14px; background: #f9fbfd; border: 1px solid var(--border-color); border-radius: 8px; font-size: 0.9rem; font-family: monospace; color: var(--text-main); }
        .copy-single-btn { background-color: #27ae60; color: white; border: none; border-radius: 6px; padding: 6px 12px; font-size: 0.8rem; font-weight: 600; cursor: pointer; transition: background-color 0.2s; }
        .copy-single-btn:hover { background-color: #219653; }

        .instruction { color: var(--text-muted); text-align: center; font-size: 0.85rem; }

        @media (max-width: 768px) { .main-container { flex-direction: column; } }