:root {
  --bg: #f7f4ee; --card: #ffffff; --ink: #222831; --muted: #6b7280; --line: #e4ded3;
  --main: #8a5a1f; --main-soft: #f1e6d6; --ai: #2f6db5; --ai-soft: #e3eefa;
  --radius: 10px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1b1d21; --card: #25282d; --ink: #e8e6e3; --muted: #9aa0a8; --line: #383c43;
    --main: #e0a96d; --main-soft: #3a2e22; --ai: #8db8ec; --ai-soft: #1f2d3d;
  }
}
:root[data-theme="dark"] {
  --bg: #1b1d21; --card: #25282d; --ink: #e8e6e3; --muted: #9aa0a8; --line: #383c43;
  --main: #e0a96d; --main-soft: #3a2e22; --ai: #8db8ec; --ai-soft: #1f2d3d;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg); color: var(--ink);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", sans-serif;
  line-height: 1.7; letter-spacing: .02em; font-size: 16px;
}
a { color: var(--main); }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.top { display: flex; justify-content: space-between; align-items: center; gap: 12px;
  padding: 12px 16px; border-bottom: 1px solid var(--line); background: var(--card); flex-wrap: wrap; }
.logo { font-weight: 800; text-decoration: none; color: var(--ink); }
.top nav a { margin-left: 16px; text-decoration: none; color: var(--muted); font-size: 14px; }
main { max-width: 1080px; margin: 0 auto; padding: 24px 16px 48px; }
.foot { max-width: 1080px; margin: 0 auto; padding: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }

/* 本棚 */
.intro h1 { font-size: 26px; margin: 8px 0 4px; }
.intro p { margin: 0 0 16px; color: var(--muted); }
.controls { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; margin-bottom: 12px; }
#q { flex: 1 1 260px; padding: 10px 12px; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--card); color: var(--ink); font-size: 16px; }
.toggle { font-size: 14px; white-space: nowrap; }
select { padding: 8px; border-radius: 8px; border: 1px solid var(--line); background: var(--card); color: var(--ink); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0; }
.chip { font-size: 12px; padding: 3px 10px; border-radius: 999px; border: 1px solid var(--line);
  background: var(--card); color: var(--ink); text-decoration: none; cursor: pointer; }
.chip.genre { border-color: var(--main); }
.chip.on { background: var(--main); color: #fff; border-color: var(--main); }
.grid { list-style: none; padding: 0; margin: 12px 0 0; display: grid; gap: 14px;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); }
.card a { display: flex; flex-direction: column; height: 100%; text-decoration: none; color: var(--ink);
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.card a:hover { border-color: var(--main); }
.card .cv { aspect-ratio: 3 / 4; background: var(--main-soft); display: flex; align-items: center; justify-content: center; overflow: hidden; }
.card .cv img { width: 100%; height: 100%; object-fit: contain; }
.card .cv span { padding: 12px; font-size: 13px; color: var(--muted); }
.card .meta { padding: 8px 10px 10px; display: flex; flex-direction: column; gap: 4px; }
.card .t { font-size: 13px; font-weight: 700; line-height: 1.45; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.card .au { font-size: 11px; color: var(--muted); overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.marks { display: flex; gap: 4px; flex-wrap: wrap; }
.mark { font-size: 10px; padding: 1px 6px; border-radius: 4px; background: var(--main-soft); color: var(--main); font-weight: 700; }

/* 本のページ */
.book .head { display: flex; gap: 24px; align-items: flex-start; }
.book .cover { width: 140px; flex: 0 0 auto; border-radius: 6px; box-shadow: 0 2px 10px rgba(0,0,0,.15); background: var(--card); }
.book .cover.none { height: 240px; background: var(--main-soft); }
.book h1 { font-size: 22px; line-height: 1.5; margin: 0 0 4px; }
.authors { color: var(--muted); margin: 0 0 8px; }
.buy { display: flex; align-items: center; gap: 8px; margin-top: 12px; }
.btn { display: inline-block; padding: 8px 16px; border-radius: 8px; background: var(--main); color: #fff;
  text-decoration: none; font-weight: 700; border: 0; font-size: 14px; cursor: pointer; }
.ad { font-size: 11px; color: var(--muted); border: 1px solid var(--line); border-radius: 4px; padding: 0 6px; }
.book section { margin-top: 28px; }
.book h2 { font-size: 17px; border-left: 4px solid var(--main); padding-left: 10px; }
.sums { list-style: none; padding: 0; display: grid; gap: 10px; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.sum { display: flex; flex-direction: column; padding: 14px 16px; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--card); text-decoration: none; color: var(--ink); }
.sum:hover { border-color: var(--main); }
.sum span { font-size: 13px; color: var(--muted); }
.reviews ul { padding-left: 1.2em; }
.reviews li { margin: 8px 0; }
.badge.ai { font-size: 11px; background: var(--ai-soft); color: var(--ai); padding: 1px 8px; border-radius: 4px; vertical-align: middle; }
blockquote { margin: 10px 0; padding: 10px 14px; border-left: 3px solid var(--line); background: var(--card); border-radius: 0 8px 8px 0; }
blockquote p { margin: 0; }
cite { display: block; font-size: 12px; color: var(--muted); font-style: normal; margin-top: 4px; }
.prose { max-width: 760px; }

/* 本のページ:左に要約(タブ)、右に AI書評・持ち主のひと言 */
body.wide main { max-width: 1440px; }
.cols { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 28px; margin-top: 24px; align-items: start; }
.book .cols section { margin-top: 0; }
.side section + section { margin-top: 28px; }
.side { position: sticky; top: 12px; }
.vbar { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 6px; }
.vbar #print { margin-left: auto; }
.tabs { display: flex; gap: 6px; flex-wrap: wrap; }
.tab { font: inherit; font-size: 14px; padding: 6px 14px; border-radius: 8px; border: 1px solid var(--line);
  background: var(--card); color: var(--ink); cursor: pointer; }
.tab.on { background: var(--main); color: #fff; border-color: var(--main); font-weight: 700; }
#note { margin: 0 0 8px; min-height: 1.4em; }
.stage { overflow: hidden; border-radius: 6px; background: #d9dee3; }
.stage iframe { border: 0; display: block; transform-origin: 0 0; background: transparent; }
.stage.pdf iframe { width: 100%; height: 85vh; }

@media (max-width: 960px) {
  .cols { grid-template-columns: minmax(0, 1fr); }
  .side { position: static; }
}
@media (max-width: 640px) {
  .book .head { flex-direction: column; }
  .book .cover { width: 140px; }
  .grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }
  .top nav a { margin-left: 10px; }
}