body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f9f9f9;
}

header {
    background: #1a73e8;
    color: #fff;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav a {
    color: white;
    margin-left: 15px;
    text-decoration: none;
    font-weight: bold;
}

nav a:hover {
    text-decoration: underline;
}

.container {
    max-width: 1000px;
    margin: 20px auto;
    background: #fff;
    padding: 20px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}


body {
    font-family: Arial, sans-serif;
    margin: 20px;
    background-color: #f4f4f4;
}
header {
    background: #333;
    color: #fff;
    padding: 10px;
    border-radius: 5px;
}
nav a {
    color: #fff;
    margin-right: 10px;
    text-decoration: none;
    font-weight: bold;
}
nav a:hover {
    text-decoration: underline;
}
.error {
    color: red;
    padding: 10px;
    border: 1px solid red;
    border-radius: 4px;
    margin-bottom: 15px;
}
.success {
    color: green;
    padding: 10px;
    border: 1px solid green;
    border-radius: 4px;
    margin-bottom: 15px;
}
section {
    margin: 20px 0;
}
.table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}
.table th, .table td {
    padding: 12px;
    border: 1px solid #ddd;
    text-align: left;
}
.table th {
    background: #333;
    color: #fff;
}
.table tr:nth-child(even) {
    background: #f9f9f9;
}
a {
    color: #0066cc;
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}
@media (max-width: 600px) {
    .table, .table th, .table td {
        display: block;
        width: 100%;
    }
    .table th {
        display: none;
    }
    .table td {
        text-align: right;
        position: relative;
        padding-left: 50%;
    }
    .table td:before {
        content: attr(data-label);
        position: absolute;
        left: 10px;
        font-weight: bold;
    }
}