:root {
  --bg: #f7f5f0;
  --paper: #ffffff;
  --ink: #1d1d1f;
  --sub: #5f6368;
  --line: #ddd8cc;
  --accent: #b3261e;
  --link: #0b57d0;
  --notice-bg: #fff4d6;
  --notice-ink: #5c4400;
  --anthropic: #c15f3c;
  --google: #1a73e8;
  --openai: #10a37f;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161616;
    --paper: #212121;
    --ink: #ececec;
    --sub: #a8a8a8;
    --line: #3a3a3a;
    --accent: #ff7a6e;
    --link: #8ab4f8;
    --notice-bg: #3a3000;
    --notice-ink: #ffe08a;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
  line-height: 1.75;
  -webkit-text-size-adjust: 100%;
}
a { color: var(--link); }
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.9em;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0 0.3em;
  overflow-wrap: anywhere;
}

/* 題字 */
.masthead {
  background: var(--paper);
  border-bottom: 4px double var(--ink);
  text-align: center;
  padding: 20px 16px 12px;
}
.brand {
  color: var(--ink);
  text-decoration: none;
  font-family: "Hiragino Mincho ProN", "Yu Mincho", "Noto Serif JP", serif;
  font-weight: 700;
  font-size: clamp(1.6rem, 6vw, 2.4rem);
  letter-spacing: 0.08em;
}
.tagline { margin: 4px 0 0; color: var(--sub); font-size: 0.85rem; }

/* 「AI による要約」の注意書き */
.notice {
  margin: 0;
  padding: 10px 16px;
  background: var(--notice-bg);
  color: var(--notice-ink);
  text-align: center;
  font-size: 0.9rem;
  font-weight: 600;
  border-bottom: 1px solid var(--line);
}

main { max-width: 760px; margin: 0 auto; padding: 16px; }
.lead { color: var(--sub); font-size: 0.95rem; }

/* トップ：日付の一覧 */
.days { list-style: none; margin: 0; padding: 0; }
.day {
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  border-radius: 6px;
  padding: 12px 16px;
  margin: 0 0 20px;
}
.day-head {
  display: flex; align-items: baseline; justify-content: space-between; gap: 8px;
  margin: 0 0 8px; font-size: 1.25rem;
}
.day-head a { color: var(--ink); text-decoration: none; }
.day-head a:hover { text-decoration: underline; }
.count { color: var(--sub); font-size: 0.85rem; font-weight: 400; white-space: nowrap; }
.headlines { margin: 0; padding-left: 1.2em; }
.headlines li { margin: 4px 0; }
.headlines a { color: var(--ink); text-decoration: none; }
.headlines a:hover { color: var(--link); text-decoration: underline; }

/* 日別ページ */
.crumb { font-size: 0.85rem; color: var(--sub); }
.day-title {
  font-family: "Hiragino Mincho ProN", "Yu Mincho", "Noto Serif JP", serif;
  font-size: clamp(1.4rem, 5vw, 1.9rem);
  margin: 8px 0 4px;
  border-bottom: 2px solid var(--ink);
  padding-bottom: 6px;
}
.scope { color: var(--sub); font-size: 0.85rem; margin: 0 0 16px; }
.item {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 12px 16px;
  margin: 0 0 16px;
  scroll-margin-top: 12px;
}
.item h2 { font-size: 1.15rem; line-height: 1.5; margin: 4px 0 8px; }
.item ul { margin: 0; padding-left: 1.2em; }
.item li { margin: 4px 0; }
.meta {
  display: flex; flex-wrap: wrap; align-items: center; gap: 6px;
  margin: 0; font-size: 0.8rem; color: var(--sub);
}
.meta time { margin-left: auto; }
.tag {
  display: inline-block;
  padding: 0 8px;
  border-radius: 999px;
  color: #fff;
  font-weight: 600;
  font-size: 0.75rem;
  line-height: 1.8;
}
.tag-anthropic { background: var(--anthropic); }
.tag-google { background: var(--google); }
.tag-openai { background: var(--openai); }
.tag-note { background: transparent; color: var(--sub); border: 1px solid var(--line); font-weight: 400; }
.source { margin: 8px 0 0; text-align: right; font-size: 0.9rem; }
.source a::after { content: " →"; }
.note {
  border-top: 1px solid var(--line);
  margin-top: 24px;
  font-size: 0.85rem;
  color: var(--sub);
}
.note h2 { font-size: 0.95rem; margin: 12px 0 4px; }

.footer {
  border-top: 1px solid var(--line);
  text-align: center;
  color: var(--sub);
  font-size: 0.8rem;
  padding: 16px;
}

/* トップと月別ページ：見出しの前の発表元タグ */
.headlines .tag { font-size: 0.65rem; line-height: 1.6; padding: 0 6px; margin-right: 2px; vertical-align: 0.1em; }

/* 月ごとの一覧 */
.months {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 12px 16px;
  margin: 0 0 20px;
}
.months h2 { font-size: 1rem; margin: 0 0 8px; }
.months ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px 20px; }
.months .count { margin-left: 6px; display: inline-block; }
.months [aria-current] { font-weight: 700; }

/* 日別ページ：前後の日 */
.pager { display: flex; justify-content: space-between; gap: 12px; margin: 20px 0 0; font-size: 0.9rem; }