* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: Arial, "Malgun Gothic", sans-serif;
    background: #f4f6f8;
    color: #222;
}
.wrap {
    width: min(900px, calc(100% - 32px));
    margin: 40px auto;
}
h1 { margin-bottom: 8px; }
.sub { color: #666; margin-top: 0; }
.card, .post, .empty {
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 10px;
    padding: 20px;
}
.card {
    display: grid;
    gap: 10px;
    margin: 24px 0 32px;
}
label { font-weight: 700; }
input, textarea {
    width: 100%;
    border: 1px solid #bbb;
    border-radius: 7px;
    padding: 12px;
    font: inherit;
}
textarea { resize: vertical; }
button {
    margin-top: 6px;
    border: 0;
    border-radius: 7px;
    padding: 12px 18px;
    font-size: 16px;
    cursor: pointer;
}
.list { display: grid; gap: 12px; }
.post { margin-bottom: 12px; }
.post-head {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
    margin-bottom: 12px;
}
time { color: #777; font-size: 13px; white-space: nowrap; }
.content { line-height: 1.65; }
.notice {
    border-radius: 7px;
    padding: 12px 14px;
    margin-top: 20px;
}
.success { background: #e9f7ef; }
.error { background: #fdecec; }