body {
    font-family: -apple-system, sans-serif;
    max-width: 640px;
    margin: 60px auto;
    padding: 0 20px;
    color: #222;
}

h1 { font-size: 28px; }

.new-btn {
    display: inline-block;
    margin: 16px 0;
    text-decoration: none;
    color: #fff;
    background: #222;
    padding: 8px 14px;
    border-radius: 6px;
}

.post-list { list-style: none; padding: 0; }
.post-list li {
    padding: 14px 0;
    border-bottom: 1px solid #eee;
    display: flex;
    justify-content: space-between;
}
.post-list a { color: #222; text-decoration: none; font-weight: 600; }
.date { color: #999; font-size: 13px; }

form { display: flex; flex-direction: column; gap: 10px; }
input, textarea {
    font-size: 15px;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-family: inherit;
}
button {
    align-self: flex-start;
    padding: 8px 16px;
    background: #222;
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

.content { white-space: pre-wrap; line-height: 1.6; margin: 20px 0; }
.back-link { display: inline-block; margin-top: 20px; color: #666; }