body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f0f4f7;
}
.container {
  display: flex;
  min-height: 100vh;
}
.sidebar {
  width: 240px;
  background: linear-gradient(to bottom right, #89d8d3, #03c8a8);
  color: white;
  padding: 20px;
}
.sidebar .logo {
  width: 100%;
  margin-bottom: 20px;
}
.sidebar ul {
  list-style: none;
  padding-left: 0;
}
.sidebar li {
  margin: 15px 0;
}
.sidebar a {
  color: white;
  text-decoration: none;
  font-weight: bold;
}
.sidebar a:hover {
  text-decoration: underline;
}
.main-content {
  flex-grow: 1;
  padding: 30px;
}
h1 {
  margin-bottom: 20px;
}
form {
  background: white;
  padding: 20px;
  border-radius: 10px;
  max-width: 600px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}
form label {
  display: block;
  margin-top: 10px;
}
form input, form select {
  width: 100%;
  padding: 10px;
  margin-top: 5px;
}
form button {
  margin-top: 20px;
  padding: 12px;
  background-color: #03c8a8;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}
form button:hover {
  background-color: #028d7e;
}
#mesaj {
  margin-top: 10px;
}


.back-button {
  display: inline-block;
  margin-bottom: 10px;
  text-decoration: none;
  color: #03c8a8;
  font-weight: bold;
}
.back-button:hover {
  text-decoration: underline;
}