.bookshelf-page {
  --shelf-bg: #f7f8fa;
  --shelf-surface: #fff;
  --shelf-ink: #202a35;
  --shelf-muted: #536171;
  --shelf-line: #d5dde4;
  --shelf-accent: #15576b;
  --shelf-accent-soft: #eaf3f5;
  max-width: 1120px;
  background: var(--shelf-bg);
  color: var(--shelf-ink);
  font-size: 16px;
}
@media (prefers-color-scheme: dark) {
  .bookshelf-page {
    --shelf-bg: #13181e;
    --shelf-surface: #1b222b;
    --shelf-ink: #edf1f5;
    --shelf-muted: #b2bdca;
    --shelf-line: #46525f;
    --shelf-accent: #9bdae8;
    --shelf-accent-soft: #263943;
  }
}
.bookshelf-page a { color: var(--shelf-accent); }
.bookshelf-page footer { border-color: var(--shelf-line); color: var(--shelf-muted); }
.bookshelf, .bookshelf * { box-sizing: border-box; }
.bookshelf [hidden] { display: none !important; }
.bookshelf h2, .bookshelf h3, .bookshelf h4 { border: 0; padding: 0; margin: 0; line-height: 1.5; }
.bookshelf p { margin: 0; }
.bookshelf :is(a, button, input, select, summary):focus-visible { outline: 3px solid var(--shelf-accent); outline-offset: 4px; }
.shelf-sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.shelf-eyebrow { color: var(--shelf-accent); font-size: .85rem; font-weight: 650; letter-spacing: .03em; }
.shelf-hero h1 { display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px 20px; margin: 8px 0 10px; font-size: clamp(1.9rem, 4vw, 2.65rem); letter-spacing: -.025em; }
.shelf-hero h1 span { font-size: .9rem; font-weight: 500; color: var(--shelf-muted); letter-spacing: 0; }
.shelf-lead { color: var(--shelf-muted); font-size: .95rem; }
.shelf-tools { margin-top: 24px; padding: 20px 24px 0; border: 1px solid var(--shelf-line); border-radius: 14px; background: var(--shelf-surface); }
.shelf-tools fieldset { margin: 0; padding: 0; border: 0; min-width: 0; }
.shelf-search-row { display: grid; grid-template-columns: minmax(0, 1fr) 220px; gap: 16px; margin-bottom: 18px; }
.shelf-tools label, .shelf-filter-label { font-size: .8rem; font-weight: 650; color: var(--shelf-muted); }
.shelf-tools label { display: block; margin-bottom: 5px; }
.shelf-tools input, .shelf-tools select { width: 100%; height: 46px; padding: 0 12px; font: inherit; font-size: .95rem; color: var(--shelf-ink); background: var(--shelf-bg); border: 1px solid var(--shelf-line); border-radius: 7px; }
.shelf-tools input::placeholder { color: var(--shelf-muted); opacity: 1; }
.shelf-filter-row { display: flex; align-items: baseline; gap: 14px; margin: 12px 0; }
.shelf-filter-label { flex: 0 0 56px; }
.shelf-language-buttons, .shelf-genre-buttons { display: flex; flex-wrap: wrap; gap: 7px; }
#shelf-genre-select { display: none; }
.shelf-tools button { min-height: 38px; padding: 6px 13px; border: 1px solid var(--shelf-line); border-radius: 6px; font: inherit; font-size: .85rem; font-weight: 550; cursor: pointer; color: var(--shelf-ink); background: var(--shelf-surface); }
.shelf-tools button:hover { background: var(--shelf-accent-soft); }
.shelf-tools button[aria-pressed="true"] { color: var(--shelf-accent); background: var(--shelf-accent-soft); border-color: var(--shelf-accent); box-shadow: inset 0 0 0 1px var(--shelf-accent); }
.shelf-language-buttons button span { margin-left: 6px; font-size: .75rem; }
.shelf-preferences { align-items: center; flex-wrap: wrap; }
.shelf-format-field { display: flex; align-items: center; gap: 12px; margin-left: auto; }
.shelf-format-field label { margin: 0; white-space: nowrap; }
.shelf-format-field select { width: 190px; height: 38px; font-size: .85rem; }
.shelf-audience-row { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 20px; margin: 16px 0; }
.shelf-audience-row label { display: flex; align-items: center; flex-wrap: wrap; gap: 7px; margin: 0; cursor: pointer; font-size: .85rem; color: var(--shelf-ink); }
.shelf-audience-row input { width: 19px; height: 19px; margin: 0; padding: 0; accent-color: var(--shelf-accent); }
.shelf-card .shelf-format-badge { align-self: flex-start; font-size: .72rem; color: var(--shelf-muted); border: 1px solid var(--shelf-line); border-radius: 4px; padding: 0 6px; margin-bottom: 8px; }
.shelf-related-button { align-self: flex-start; font: inherit; font-size: .8rem; padding: 5px 0; border: 0; color: var(--shelf-accent); background: none; cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }
.shelf-map { margin-top: 18px; padding: 18px 22px; border: 1px solid var(--shelf-line); border-radius: 10px; background: var(--shelf-surface); scroll-margin-top: 20px; }
.shelf-map > summary { cursor: pointer; font-weight: 650; }
.shelf-map > summary span { color: var(--shelf-muted); font-weight: 400; font-size: .8rem; margin-left: 12px; }
.shelf-map .shelf-map-intro { font-size: .88rem; margin-top: 16px; }
.shelf-map #shelf-map-message { margin: 10px 0; }
.shelf-map-method { border-top: 1px solid var(--shelf-line); padding-top: 14px; font-size: .8rem; color: var(--shelf-muted); }
.shelf-map-method summary { cursor: pointer; }
.shelf-map-method p { margin-top: 12px; }
.shelf-results-bar { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-top: 17px; padding: 11px 0; border-top: 1px solid var(--shelf-line); font-size: .85rem; }
.shelf-results-bar #shelf-reset { padding: 0; color: var(--shelf-accent); background: none; border: 0; text-decoration: underline; text-underline-offset: 3px; }
.shelf-upcoming { margin-top: 16px; padding: 14px 18px; border-left: 3px solid var(--shelf-accent); border-radius: 0 8px 8px 0; background: var(--shelf-accent-soft); }
.shelf-upcoming summary { display: flex; align-items: center; gap: 14px; cursor: pointer; list-style: none; font-size: .9rem; }
.shelf-upcoming summary::-webkit-details-marker { display: none; }
.shelf-badge { flex-shrink: 0; font-size: .72rem; font-weight: 700; color: var(--shelf-accent); border: 1px solid var(--shelf-accent); border-radius: 4px; padding: 2px 7px; }
.shelf-upcoming small { display: block; color: var(--shelf-muted); font-size: .78rem; }
.shelf-upcoming-more { margin-left: auto; flex-shrink: 0; font-size: .8rem; text-decoration: underline; }
.shelf-upcoming-more::after { content: " ＋"; }
.shelf-upcoming details[open] .shelf-upcoming-more::after { content: " −"; }
.shelf-upcoming-content { padding-top: 12px; font-size: .9rem; }
.shelf-upcoming-content p + p { margin-top: 8px; }
.shelf-language { margin-top: 38px; }
.shelf-language > h2 { display: flex; gap: 12px; align-items: baseline; padding-bottom: 10px; border-bottom: 1px solid var(--shelf-line); font-size: 1.4rem; }
.shelf-language-count { font-size: .85rem; font-weight: 500; color: var(--shelf-muted); }
.shelf-genre { margin-top: 24px; }
.shelf-genre-heading { display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: 4px 12px; margin-bottom: 12px; }
.shelf-genre-heading h3 { font-size: 1rem; }
.shelf-genre-count { color: var(--shelf-muted); margin-left: 7px; font-size: .8rem; font-weight: 500; }
.shelf-genre-heading p { font-size: .8rem; color: var(--shelf-muted); }
.shelf-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.shelf-card { display: flex; flex-direction: column; padding: 20px; border: 1px solid var(--shelf-line); background: var(--shelf-surface); border-radius: 10px; min-width: 0; overflow-wrap: anywhere; scroll-margin-top: 24px; }
.shelf-card-top { display: flex; gap: 10px; justify-content: space-between; align-items: baseline; font-size: .72rem; color: var(--shelf-muted); margin-bottom: 10px; }
.shelf-card-top span:first-child { color: var(--shelf-accent); }
.shelf-card h4 { font-size: 1.05rem; line-height: 1.55; }
.shelf-card .shelf-author { font-size: .8rem; color: var(--shelf-muted); margin-top: 8px; }
.shelf-card .shelf-introduction { font-size: .9rem; margin: 16px 0; }
.shelf-book-details { margin-top: auto; font-size: .82rem; }
.shelf-book-details summary { width: fit-content; cursor: pointer; color: var(--shelf-muted); padding: 5px 0; }
.shelf-book-details > div { padding: 10px 0 2px; }
.shelf-book-details dl { display: grid; grid-template-columns: 3em 1fr; gap: 4px 8px; margin: 10px 0; }
.shelf-book-details dd { margin: 0; }
.shelf-links { display: flex; flex-wrap: wrap; gap: 10px 18px; margin-top: 12px; font-size: .82rem; }
.shelf-card .shelf-links { padding-top: 14px; border-top: 1px solid var(--shelf-line); }
.shelf-library-link { font-weight: 650; }
.shelf-empty { text-align: center; margin: 32px 0; padding: 32px 20px; border: 1px dashed var(--shelf-line); border-radius: 10px; }
.shelf-empty h2 { font-size: 1.1rem; margin-bottom: 10px; }
.shelf-empty p { color: var(--shelf-muted); font-size: .9rem; }
.shelf-guide { margin-top: 36px; padding: 18px 22px; background: var(--shelf-surface); border: 1px solid var(--shelf-line); border-radius: 10px; font-size: .9rem; }
.shelf-guide > summary { cursor: pointer; font-weight: 650; }
.shelf-guide > p { margin-top: 14px; }
.shelf-learning-path { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); list-style: none; padding: 0; gap: 16px; margin: 20px 0; }
.shelf-learning-path li { position: relative; padding: 12px; background: var(--shelf-accent-soft); border-radius: 6px; font-size: .8rem; font-weight: 650; }
.shelf-learning-path li:not(:last-child)::after { content: "→"; position: absolute; right: -15px; top: 50%; transform: translateY(-50%); }
.shelf-learning-path span { display: block; color: var(--shelf-muted); font-weight: 400; font-size: .75rem; }
.shelf-note { color: var(--shelf-muted); font-size: .78rem; }
.bookshelf .shelf-policy { margin-top: 24px; max-width: 85ch; }
@media (max-width: 950px) {
  .shelf-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 600px) {
  .bookshelf-page { padding: 20px 16px 40px; }
  .shelf-tools { padding: 16px 16px 0; }
  .shelf-search-row { grid-template-columns: 1fr; gap: 10px; margin-bottom: 16px; }
  .shelf-filter-row { display: block; }
  .shelf-filter-label { display: block; margin-bottom: 7px; }
  .shelf-language-buttons { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 6px; }
  .shelf-language-buttons button { font-size: .8rem; padding: 6px 4px; white-space: nowrap; }
  .shelf-language-buttons button span { margin-left: 4px; font-size: .7rem; }
  .shelf-format-field { margin-top: 12px; display: block; }
  .shelf-format-field label { margin-bottom: 5px; }
  .shelf-format-field select { width: 100%; height: 42px; }
  .shelf-genre-buttons { display: none; }
  #shelf-genre-select { display: block; }
  .shelf-grid { grid-template-columns: 1fr; }
  .shelf-upcoming summary { gap: 10px; align-items: flex-start; flex-wrap: wrap; }
  .shelf-upcoming summary > span:nth-child(2) { flex: 1; min-width: 180px; }
  .shelf-upcoming-more { display: none; }
  .shelf-upcoming summary::after { content: "詳細を開く ＋"; font-size: .78rem; color: var(--shelf-accent); }
  .shelf-upcoming details[open] summary::after { content: "詳細を閉じる −"; }
  .shelf-language { margin-top: 28px; }
  .shelf-map { padding: 16px; }
  .shelf-map > summary span { display: block; margin-left: 17px; }
  .shelf-learning-path { grid-template-columns: 1fr; gap: 22px; }
  .shelf-learning-path li:not(:last-child)::after { content: "↓"; right: 50%; top: auto; bottom: -23px; transform: none; }
}
@media (prefers-color-scheme: dark) {
}
@media (forced-colors: active) { .shelf-tools button[aria-pressed="true"] { outline: 2px solid Highlight; outline-offset: -4px; } }