body {
    font-family: sans-serif;
    line-height: 1.6;
    color: #333;
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f4f4f4;
}

header {
    background: #333;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
    margin-bottom: 2rem;
}

main {
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

h1, h2 {
    color: #333;
    border-bottom: 2px solid #eee;
    padding-bottom: 0.5rem;
}

form {
    margin-bottom: 1rem;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

label {
    font-weight: bold;
    margin-bottom: 5px;
}

input[type="text"],
input[type="password"],
select {
    width: 100%;
    padding: 8px;
    box-sizing: border-box;
    border: 1px solid #ccc;
    border-radius: 4px;
}

button {
    background: #333;
    color: #fff;
    border: none;
    padding: 10px 15px;
    cursor: pointer;
    border-radius: 4px;
    transition: background-color 0.3s;
}

button:hover {
    background: #555;
}

hr {
    border: 0;
    height: 1px;
    background: #ccc;
    margin: 20px 0;
}

ul {
    list-style-type: none;
    padding: 0;
}

li {
    background: #f9f9f9;
    margin: 5px 0;
    padding: 10px;
    border-left: 5px solid #007BFF;
}

.message {
    margin-top: 10px;
    font-weight: bold;
}

#teachers-list p {
    font-style: italic;
    color: #666;
}