body {
    font-family: 'Segoe UI', sans-serif;
    background: #f9f9f9;
    margin: 0;
    padding: 0;
}
header, footer {
    background-color: #004d40;
    color: white;
    text-align: center;
    padding: 10px 0;
}
.container { width: 90%; margin: 20px auto; }
.login-box {
    width: 400px; background: white; margin: 100px auto;
    padding: 20px; border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1); text-align: center;
}
.login-box img { width: 100px; margin-bottom: 10px; }
.login-box input {
    width: 90%; padding: 10px; margin: 10px 0;
    border: 1px solid #ddd; border-radius: 5px;
}
button {
    background: #00796b; color: white;
    padding: 10px 20px; border: none;
    border-radius: 5px; cursor: pointer;
}
.sidebar {
    width: 220px; background: #00796b;
    position: fixed; height: 100%;
    color: white; padding: 20px;
}
.sidebar h3 { text-align: center; }
.sidebar a {
    display: block; color: white; padding: 10px; text-decoration: none;
}
.sidebar a:hover { background: #004d40; }
.table {
    width: 100%; border-collapse: collapse; background: white;
}
.table th, .table td {
    padding: 10px; border: 1px solid #ddd; text-align: center;
}
.content { margin-left: 240px; padding: 20px; }