body {
    font-family: Arial, sans-serif;
    background: #e5ddd5;
    padding: 0;
    margin: 0;
}

.container {
    width: 95%;
    max-width: 800px;
    margin: 40px auto;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    padding: 20px;
}

h1, h2, h3 {
    color: #075e54;
    margin-top: 0;
}

ul.user-list {
    list-style: none;
    padding: 0;
}

ul.user-list li {
    margin-bottom: 4px;
}

#messages {
    background: #f7f7f7;
    border: 1px solid #ddd;
    height: 320px;
    overflow-y: auto;
    padding: 10px;
    margin-bottom: 10px;
    border-radius: 4px;
}

.message-self {
    text-align: right;
    color: #128c7e;
}

.message-other {
    text-align: left;
    color: #222;
}

form {
    margin-top: 10px;
}

input[type="text"], input[type="password"], input[type="submit"], button, textarea {
    font-size: 16px;
    padding: 7px;
    margin: 3px 0;
    border-radius: 4px;
    border: 1px solid #aaa;
    outline: none;
}

input[type="text"]:focus, input[type="password"]:focus, textarea:focus {
    border-color: #128c7e;
}

button, input[type="submit"] {
    background: #128c7e;
    color: #fff;
    border: none;
    cursor: pointer;
    transition: background 0.2s;
}

button:hover, input[type="submit"]:hover {
    background: #075e54;
}

.table-admin {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
}

.table-admin th, .table-admin td {
    border: 1px solid #ddd;
    padding: 8px;
}

.table-admin th {
    background: #075e54;
    color: #fff;
}

.table-admin tr:nth-child(even) {
    background: #f2f2f2;
}