body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #f4f7f6;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}
.login-container, .dashboard-container {
    background-color: #fff;
    padding: 2em;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
}
.dashboard-container {
    max-width: 800px;
}
h2 {
    color: #333;
    text-align: center;
    margin-bottom: 1.5em;
}
label {
    display: block;
    margin-bottom: 0.5em;
    color: #555;
    font-weight: 600;
}
input[type="text"], input[type="password"] {
    width: 100%;
    padding: 0.8em;
    margin-bottom: 1em;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
}
button {
    width: 100%;
    padding: 0.9em;
    border: none;
    background-color: #007bff;
    color: white;
    font-size: 1em;
    font-weight: 600;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
}
button:hover {
    background-color: #0056b3;
}
.error {
    color: #d93025;
    background-color: #f8d7da;
    border: 1px solid #f5c6cb;
    padding: 0.75em;
    border-radius: 4px;
    margin-top: 1em;
    text-align: center;
}
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2em;
    border-bottom: 1px solid #eee;
    padding-bottom: 1em;
}
header h1 {
    margin: 0;
    font-size: 1.5em;
}
header a {
    text-decoration: none;
    color: #007bff;
    font-weight: 600;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1em;
}
th, td {
    padding: 0.8em;
    text-align: left;
    border-bottom: 1px solid #ddd;
}
th {
    background-color: #f2f2f2;
    font-weight: 600;
}