body {
    font-family: Tahoma, Verdana, Arial, sans-serif;
    background-color: #e9ecef;
    color: #333;
    margin: 0;
    padding: 0;
}
#wrapper {
    width: 960px;
    margin: 20px auto;
    background-color: #ffffff;
    border: 1px solid #999;
    box-shadow: 2px 2px 5px #ccc;
}
#header {
    background-color: #004488;
    color: white;
    padding: 15px 20px;
    border-bottom: 3px solid #002244;
}
#header h1 {
    margin: 0;
    font-size: 24px;
    letter-spacing: 1px;
}
#content-area {
    display: flex;
}
#main {
    width: 70%;
    padding: 20px;
    border-right: 1px dashed #ccc;
}
#sidebar {
    width: 30%;
    padding: 20px;
    background-color: #f4f4f4;
}
.box {
    border: 1px solid #b0c4de;
    background-color: #f9fbfd;
    padding: 10px;
    margin-bottom: 15px;
}
.box-title {
    background-color: #b0c4de;
    padding: 5px;
    font-weight: bold;
    margin: -10px -10px 10px -10px;
    color: #003366;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}
th, td {
    border: 1px solid #ccc;
    padding: 8px;
    text-align: left;
}
th {
    background-color: #e0e0e0;
}
input[type="text"], input[type="password"], textarea {
    width: 95%;
    padding: 5px;
    border: 1px solid #999;
    font-family: inherit;
    margin-bottom: 10px;
}
input[type="submit"] {
    background-color: #004488;
    color: white;
    border: 1px solid #002244;
    padding: 5px 15px;
    cursor: pointer;
    font-weight: bold;
}
input[type="submit"]:hover {
    background-color: #0055aa;
}
.error { color: red; font-weight: bold; margin-bottom: 10px; }