body {
    font-family: Arial, sans-serif;
    margin: 20px;
    background-color: #f4f4f9;
    color: #333;
    max-width: 800px;
    margin: 20px auto;
}
h1, h2 {
    color: #4a4a8c;
}
form {
    background: #fff;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}
label {
    display: block;
    margin-bottom: 10px;
}
input[type="text"], input[type="url"] {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
}
button {
    background-color: #4a4a8c;
    color: white;
    padding: 10px 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}
button:hover {
    background-color: #3a3a6c;
}
table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
th, td {
    border: 1px solid #ddd;
    padding: 12px;
    text-align: left;
}
th {
    background-color: #4a4a8c;
    color: white;
}
.group-header {
    background-color: #e8e8ff;
    font-weight: bold;
    text-align: center;
}
#assignments {
    background: #fff;
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-top: 20px;
}
.assignment-card {
    margin: 10px 0;
    padding: 15px;
    border-radius: 8px;
    border-left: 5px solid #4a4a8c;
    display: flex;
    align-items: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease, opacity 0.3s ease;
    opacity: 0;
    animation: fadeIn 0.5s forwards;
}
.assignment-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}
.assignment-text {
    font-size: 1.1em;
    font-weight: 500;
    flex-grow: 1;
}
.giver, .receiver {
    padding: 5px 10px;
    border-radius: 4px;
    color: #333;
}
a {
    color: #4a4a8c;
    text-decoration: none;
    display: block;
    margin-top: 20px;
}
a:hover {
    text-decoration: underline;
}
#editModal {
    display: none;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.4);
    padding-top: 60px;
}
#editModalContent {
    background-color: #fefefe;
    margin: 5% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 500px;
    border-radius: 8px;
}
#closeModal {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}
#closeModal:hover {
    color: black;
}