body {
    font-family: monospace;
    background-color: #ffffff;
    color: #000000;
    margin: 40px auto;
    max-width: 800px;
    line-height: 1.6;
    padding: 0 20px;
}
a {
    color: #0000ee;
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}
form {
    margin-bottom: 20px;
}
input, textarea, button, select {
    font-family: monospace;
    margin-bottom: 10px;
    font-size: 14px;
}
table {
    width: 100%;
    border-collapse: collapse;
}
th, td {
    border: 1px solid #ccc;
    padding: 8px;
    text-align: left;
}
.warning {
    color: red;
    font-weight: bold;
}
.nav {
    margin-bottom: 20px;
    border-bottom: 1px solid #ccc;
    padding-bottom: 10px;
}

body.dark-mode {
    background-color: #121212;
    color: #e0e0e0;
}
body.dark-mode a {
    color: #82aaff;
}
body.dark-mode th, body.dark-mode td {
    border-color: #444;
}
body.dark-mode input, body.dark-mode textarea, body.dark-mode button, body.dark-mode select {
    background-color: #333;
    color: #e0e0e0;
    border: 1px solid #555;
}
body.dark-mode .nav {
    border-bottom: 1px solid #444;
}

/* responsive / mobile */
input, select, textarea, button {
    max-width: 100%;
    box-sizing: border-box;
}
textarea {
    width: 100%;
}
.table-wrapper {
    overflow-x: auto;
    width: 100%;
}
@media (max-width: 600px) {
    body {
        margin: 15px auto;
        padding: 0 15px;
    }
    table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }
}