* { box-sizing: border-box; }
body {
    font-family: system-ui, sans-serif;
    margin: 0;
    background: #f5f5f4;
    color: #222;
}
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: #1f2937;
    color: white;
}
header a { color: white; text-decoration: none; }
header .brand { font-weight: 600; }
header nav { display: flex; gap: 1rem; align-items: center; }
main {
    max-width: 700px;
    margin: 2rem auto;
    padding: 0 1rem;
}
.login-box {
    max-width: 320px;
    margin: 4rem auto;
    background: white;
    padding: 2rem;
    border-radius: 8px;
}
form label {
    display: block;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}
form input, form textarea {
    display: block;
    width: 100%;
    padding: 0.5rem;
    margin-top: 0.25rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-family: inherit;
}
button {
    background: #1f2937;
    color: white;
    border: none;
    padding: 0.6rem 1.2rem;
    border-radius: 4px;
    cursor: pointer;
}
.error { color: #b91c1c; }
.tool-list { list-style: none; padding: 0; }
.tool-list li { margin-bottom: 0.5rem; }
.tool-list a {
    display: block;
    padding: 1rem;
    background: white;
    border-radius: 6px;
    text-decoration: none;
    color: #1f2937;
}
.result-box {
    background: white;
    padding: 1rem;
    border-radius: 6px;
    white-space: pre-wrap;
    margin-top: 1rem;
}