:root {
  --bg: #f5f5f7;
  --card: #ffffff;
  --text: #1a1a1a;
  --sub: #666666;
  --border: #949494;
  --line: #e6e6e6;
  --accent: #0017c1;
  --accent-tint: #e8f1fe;
  --error: #ce0000;
  --ok: #197a4b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 100%/1.7 system-ui, "Meiryo UI", "Hiragino Sans", sans-serif;
}

.site-header,
main,
.site-footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 16px;
}

.site-header { padding-top: 32px; padding-bottom: 8px; }
h1 { margin: 0; font-size: 1.75rem; line-height: 1.3; letter-spacing: -0.01em; }
.lead { margin: 6px 0 0; color: var(--sub); }

h2 { font-size: 1.15rem; margin: 0 0 12px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px;
  margin: 20px 0 28px;
}

.field { display: block; margin-bottom: 14px; position: relative; }
.label { display: block; font-weight: 600; margin-bottom: 6px; }
.hint { font-weight: 400; color: var(--sub); font-size: 0.875rem; }

input[type="text"],
textarea {
  width: 100%;
  font: inherit;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #ffffff;
  color: var(--text);
}
textarea { resize: vertical; min-height: 110px; }
input[type="text"]:focus,
textarea:focus { outline: 3px solid #ffd43d; outline-offset: 1px; border-color: #000000; }

.counter { display: block; text-align: right; font-size: 0.875rem; color: var(--sub); }
.counter.over { color: var(--error); font-weight: 700; }

/* 人には見えない入力欄 */
.trap { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }

button {
  font: inherit;
  font-weight: 600;
  min-height: 44px;
  padding: 10px 24px;
  border: none;
  border-radius: 999px;
  background: var(--accent);
  color: #ffffff;
  cursor: pointer;
  transition: transform 100ms ease-out, opacity 120ms ease-out;
}
button:active { transform: scale(0.97); }
button:disabled { opacity: 0.45; cursor: default; }
button.ghost { background: var(--accent-tint); color: var(--accent); padding: 8px 18px; min-height: 40px; }

.status { margin: 0; font-size: 0.9375rem; }
.status.error { color: var(--error); font-weight: 600; }
.status.ok { color: var(--ok); font-weight: 600; }

.rules { margin-top: 16px; color: var(--sub); font-size: 0.9375rem; }
.rules summary { cursor: pointer; color: var(--text); font-weight: 600; }
.rules ul { margin: 8px 0 0; padding-left: 1.25em; }

.list-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 8px; }
.list-head h2 { margin: 0; }

.posts { list-style: none; margin: 0; padding: 0; }
.post {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px 16px;
  margin-bottom: 10px;
}
.post-meta { display: flex; flex-wrap: wrap; gap: 4px 12px; font-size: 0.875rem; color: var(--sub); margin-bottom: 4px; }
.post-no { font-variant-numeric: tabular-nums; }
.post-name { font-weight: 700; color: var(--text); }
.post-body { margin: 0; white-space: pre-wrap; overflow-wrap: anywhere; }

.empty { color: var(--sub); text-align: center; padding: 24px 0; }

.site-footer { color: var(--sub); font-size: 0.875rem; padding-top: 16px; padding-bottom: 40px; text-align: center; }

@media (prefers-reduced-motion: reduce) {
  button { transition: none; }
  button:active { transform: none; opacity: 0.7; }
}