* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, sans-serif;
  background-color: #f4f4f4;
  color: #222;
  line-height: 1.6;
}

.page-header {
  background-color: #ffffff;
  padding: 1.5rem;
  border-bottom: 1px solid #ddd;
}

.nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
  text-align: center;
}

.nav-list li {
  display: inline-block;
  margin: 0 1rem;
}

.nav-list a {
  text-decoration: none;
  color: #333;
  font-weight: 500;
}

.container {
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1rem;
}

.card {
  background-color: #ffffff;
  padding: 1.5rem;
  margin-bottom: 2rem;
  border: 1px solid #ddd;
  border-radius: 8px;
}

.profile img {
  width: 150px;
  border-radius: 50%;
  display: block;
  margin-bottom: 1rem;
}

.form-group {
  margin-bottom: 1rem;
}

label {
  display: block;
  margin-bottom: 0.25rem;
}

input,
textarea {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid #ccc;
  border-radius: 4px;
}

button {
  padding: 0.6rem 1.2rem;
  background-color: #222;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

.page-footer {
  text-align: center;
  padding: 1.5rem;
  font-size: 0.85rem;
  color: #666;
  background-color: #ffffff;
  border-top: 1px solid #ddd;
}