body {
    margin: 0;
    padding: 16px;
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    color: #111827;
    background: #f8fafc;
}

img {
    display: block;
    margin-bottom: 16px;
    border-radius: 12px;
}

form {
    max-width: 420px;
    margin-top: 12px;
}

input[type="text"],
input[type="password"],
input[name="username"],
input[name="password"] {
    width: 100%;
    max-width: 420px;
    box-sizing: border-box;
    margin: 6px 0 12px;
    padding: 10px 12px;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    background: #fff;
}

input[type="submit"],
button[type="reset"] {
    padding: 8px 16px;
    border: 0;
    border-radius: 8px;
    background: #2563eb;
    color: #fff;
    cursor: pointer;
}

button[type="reset"] {
    background: #475569;
}

a {
    color: #2563eb;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}