body {
    font-family: Arial, sans-serif;
    background: #f0f0f0;
    margin: 0;
    padding: 20px;
}
.container {
    max-width: 400px;
    margin: 0 auto;
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
h2 { text-align: center; }
.list-item {
    display: flex;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px solid #eee;
}
.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    margin-right: 10px;
}
.info { flex: 1; }
.btn {
    background: #4CAF50;
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
}
.btn-danger { background: #f44336; }
.btn-small { padding: 4px 8px; font-size: 12px; }
.switch-link {
    color: #2196F3;
    cursor: pointer;
    text-decoration: underline;
    margin-top: 10px;
    display: inline-block;
}
.form-group { margin-bottom: 15px; }
.form-group label { display: block; margin-bottom: 5px; }
.form-group input {
    width: 100%;
    padding: 8px;
    box-sizing: border-box;
}
.checkbox-group {
    display: flex;
    align-items: center;
}
.checkbox-group input { width: auto; margin-right: 5px; }
.error { color: red; font-size: 14px; margin-top: 10px; }
.hidden { display: none; }