body {
    font-family: Arial, sans-serif;
    background: #f4f4f4;
    margin: 0;
    padding: 20px;
}
.container {
    max-width: 900px;
    margin: auto;
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
h1, h2 {
    color: #333;
}
label {
    display: block;
    margin-top: 15px;
    font-weight: bold;
}
input, select, textarea, button {
    width: 100%;
    padding: 8px;
    margin-top: 5px;
    border: 1px solid #ddd;
    border-radius: 4px;
}
button {
    background: #007bff;
    color: white;
    border: none;
    cursor: pointer;
    margin-top: 20px;
}
button:hover {
    background: #0056b3;
}
.error {
    background: #f8d7da;
    color: #721c24;
    padding: 10px;
    border-radius: 4px;
    margin: 10px 0;
}
.success {
    background: #d4edda;
    color: #155724;
    padding: 10px;
    border-radius: 4px;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}
th, td {
    border: 1px solid #ddd;
    padding: 8px;
    text-align: left;
}
th {
    background: #f2f2f2;
}
.yanit {
    background: #f9f9f9;
    padding: 10px;
    margin: 10px 0;
    border-left: 3px solid #007bff;
}
.mesaj {
    background: #eef;
    padding: 10px;
    margin: 10px 0;
}