body {
  background-color: #f8f8f8;
  font-family: sans-serif;
  margin: 0;
}
main {
  max-width: 800px;
  margin: 40px auto;
  background-color: white;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}
.post-item {
  padding: 15px;
  border-bottom: 1px solid #ddd;
  overflow: hidden; /* float 포함 */
}
.post-item:last-child {
  border-bottom: none;
}
.post-index {
  margin-right: 5px;
  color: #888;
  font-weight: bold;
}
.post-title {
  font-weight: bold;
  font-size: 16px;
  cursor: pointer;
  display: inline-block;
}
.post-title:hover {
  text-decoration: underline;
}
.post-meta {
  float: right;
  font-size: 14px;
  color: #555;
  text-align: right;
}
.post-writer {
  margin-right: 10px;
}
.post-enddate {
  color: #777;
}
@media (max-width: 700px) {
  main {
    margin: 20px;
  }
  .post-title {
    display: block;
    margin-bottom: 8px;
  }
  .post-meta {
    float: none;
    display: block;
    text-align: left;
  }
}