body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: #f4f6f8;
}
header {
    background: #1e293b;
    padding: 15px 40px;
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
nav a {
    color: white;
    margin-left: 25px;
    text-decoration: none;
    font-weight: bold;
    cursor: pointer;
}
nav a:hover { text-decoration: underline; }
.container {
    max-width: 500px;
    margin: 40px auto;
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 0 15px rgba(0,0,0,0.08);
}
h1, h2 { margin-top: 0; }
input, select, button {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    font-size: 16px;
    box-sizing: border-box;
}
button {
    background: #1e293b;
    color: white;
    border: none;
    cursor: pointer;
    margin-right: 8px;
}
button:last-child { margin-right: 0; }
.msg { margin-top: 15px; font-weight: bold; }