/* =====================================================
   Fountain Pen Navi — スタイルシート
   ===================================================== */

/* -- カラーパレット & トークン -- */
:root {
  --clr-bg:         #eef1f4;
  --clr-surface:    #ffffff;
  --clr-surface-2:  #e4e9ef;
  --clr-border:     #cfd6de;
  --clr-text:       #15202b;
  --clr-text-sub:   #4a5a6a;
  --clr-accent:     #1f4b7a;
  --clr-accent-lt:  #3d6f9c;
  --clr-accent-bg:  #e8f0f7;
  --clr-gold:       #b08d57;
  --clr-tag-bg:     #e8eef4;
  --clr-tag-text:   #1f4b7a;
  --clr-amazon:     #ff9900;
  --clr-amazon-dk:  #e07000;
  --radius-sm:      6px;
  --radius-md:      12px;
  --radius-lg:      20px;
  --shadow-card:    0 2px 12px rgba(31,75,122,.08);
  --shadow-hover:   0 6px 24px rgba(31,75,122,.16);
  --font-serif:     "Libre Baskerville", "Times New Roman", serif;
  --font-sans:      "IBM Plex Sans JP", "Helvetica Neue", sans-serif;
  --transition:     .2s ease;
}

.site-logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--clr-accent);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.site-logo-icon { display: none; }

.curated-cover img {
  width: 96px;
  height: 96px;
  object-fit: contain;
  background: #fff;
}

/* -- リセット & ベース -- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--clr-bg);
  color: var(--clr-text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--clr-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; display: block; }

/* -- ヘッダー -- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--clr-border);
}
.site-header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--clr-text);
  text-decoration: none;
}
.site-logo-icon {
  width: 32px;
  height: 32px;
  object-fit: contain;
  flex-shrink: 0;
}
.site-logo-text { letter-spacing: .04em; }
.site-nav {
  display: flex;
  gap: 24px;
  align-items: center;
}
.site-nav a {
  color: var(--clr-text-sub);
  font-size: .9rem;
  transition: color var(--transition);
}
.site-nav a:hover, .site-nav a.active {
  color: var(--clr-accent);
  text-decoration: none;
}

/* -- ヒーロー -- */
.hero {
  background: linear-gradient(135deg, #f9f2ea 0%, #fff8f2 50%, #f5ede0 100%);
  text-align: center;
  padding: 72px 20px 56px;
  border-bottom: 1px solid var(--clr-border);
}
.hero-kicker {
  font-size: .85rem;
  color: var(--clr-accent);
  letter-spacing: .12em;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 12px;
}
.hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  color: var(--clr-text);
  letter-spacing: .06em;
  margin-bottom: 16px;
}
.hero-sub {
  font-size: 1rem;
  color: var(--clr-text-sub);
  max-width: 500px;
  margin: 0 auto 28px;
  line-height: 1.7;
}
.hero-updated {
  font-size: .8rem;
  color: var(--clr-text-sub);
  margin-top: 20px;
}

/* -- 検索ボックス -- */
.searchbox {
  max-width: 480px;
  margin: 0 auto 8px;
}
.searchbox input {
  width: 100%;
  padding: 13px 18px;
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-lg);
  font-family: var(--font-sans);
  font-size: 1rem;
  background: #fff;
  color: var(--clr-text);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.searchbox input:focus {
  border-color: var(--clr-accent-lt);
  box-shadow: 0 0 0 3px rgba(196,154,108,.2);
}

/* -- コンテナ -- */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 20px 80px;
}

/* -- ツールバー -- */
.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 20px;
  margin-bottom: 28px;
}
.toolbar-label {
  font-size: .82rem;
  color: var(--clr-text-sub);
  font-weight: 500;
  flex-shrink: 0;
}
.genre-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.sort-box {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}
.sort-box select {
  padding: 6px 12px;
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: .85rem;
  background: #fff;
  color: var(--clr-text);
  cursor: pointer;
}

/* -- チップ -- */
.chip {
  padding: 5px 14px;
  border-radius: 99px;
  font-size: .82rem;
  font-weight: 500;
  cursor: pointer;
  border: 1.5px solid var(--clr-border);
  background: #fff;
  color: var(--clr-text-sub);
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}
.chip:hover, .chip.active {
  background: var(--clr-accent);
  border-color: var(--clr-accent);
  color: #fff;
  text-decoration: none;
}

/* -- セクション見出し -- */
.section-head {
  text-align: center;
  margin-bottom: 32px;
}
.count-badge {
  display: inline-block;
  background: var(--clr-accent);
  color: #fff;
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .08em;
  padding: 3px 12px;
  border-radius: 99px;
  margin-bottom: 10px;
}
.section-head h2 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 6px;
}
.section-head p { font-size: .88rem; color: var(--clr-text-sub); }
.rank-activity {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 10px;
}
.rank-activity-item {
  display: inline-block;
  font-size: .78rem;
  font-weight: 600;
  color: var(--clr-accent);
  background: var(--clr-accent-bg);
  padding: 4px 10px;
  border-radius: 99px;
}

/* -- カードグリッド -- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 48px;
}
.grid-compact {
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 14px;
}

/* -- カード -- */
.card {
  display: flex;
  flex-direction: column;
  background: var(--clr-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  text-decoration: none;
  color: var(--clr-text);
  transition: transform var(--transition), box-shadow var(--transition);
  border: 1px solid var(--clr-border);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  text-decoration: none;
}
.cover {
  position: relative;
  background: var(--clr-surface-2);
  aspect-ratio: 2/3;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .3s ease;
}
.card:hover .cover img { transform: scale(1.04); }
.cover-fallback {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
  background: linear-gradient(160deg, var(--clr-surface-2), var(--clr-accent-bg));
}
.cover-fallback-title {
  font-family: var(--font-serif);
  font-size: .85rem;
  color: var(--clr-accent);
  text-align: center;
  line-height: 1.4;
  font-weight: 700;
}
.cover-fallback-lg { aspect-ratio: 2/3; border-radius: var(--radius-md); }
.rank {
  position: absolute;
  top: 8px;
  left: 8px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .75rem;
  font-weight: 700;
  background: rgba(0,0,0,.4);
  color: #fff;
}
.rank-top3 { background: var(--clr-gold); }
.rank-move {
  position: absolute;
  top: 8px;
  right: 8px;
  font-size: .68rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 99px;
  letter-spacing: .02em;
}
.rank-move-new { background: #2e7d32; color: #fff; }
.rank-move-up { background: #1565c0; color: #fff; }
.rank-move-down { background: #757575; color: #fff; }
.crown {
  position: absolute;
  bottom: 8px;
  left: 0; right: 0;
  text-align: center;
  font-size: .72rem;
  font-weight: 700;
  color: var(--clr-gold);
  background: rgba(0,0,0,.55);
  padding: 3px 6px;
  letter-spacing: .04em;
}
.card-body {
  padding: 12px 14px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}
.card-title {
  font-family: var(--font-serif);
  font-size: .92rem;
  font-weight: 700;
  line-height: 1.3;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-author {
  font-size: .78rem;
  color: var(--clr-text-sub);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 4px;
}
.card-publisher {
  font-size: .72rem;
  color: var(--clr-text-sub);
}
.card-genre {
  background: var(--clr-tag-bg);
  color: var(--clr-tag-text);
  font-size: .68rem;
  padding: 2px 8px;
  border-radius: 99px;
  font-weight: 500;
}
.card-scores {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: auto;
  padding-top: 8px;
}
.score-star { color: var(--clr-gold); font-weight: 700; font-size: .82rem; }
.score-mention { color: var(--clr-accent); font-size: .82rem; }
.grid-empty {
  text-align: center;
  color: var(--clr-text-sub);
  padding: 40px;
  font-size: 1rem;
}

/* -- ジャンルセクション -- */
.genre-links {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--clr-border);
}
.genre-links h2 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 16px;
}

/* -- サイト概要 -- */
.site-about-summary {
  margin-top: 48px;
  padding: 28px 24px;
  background: var(--clr-accent-bg);
  border-radius: var(--radius-md);
  border: 1px solid var(--clr-border);
}
.site-about-summary h2 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--clr-accent);
}
.site-about-summary p { font-size: .92rem; color: var(--clr-text-sub); line-height: 1.8; }

/* -- パンくず -- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: .82rem;
  color: var(--clr-text-sub);
  margin-bottom: 24px;
}
.breadcrumb a { color: var(--clr-accent); }
.breadcrumb a:hover { text-decoration: underline; }

/* -- ページ見出し -- */
.page-head {
  margin-bottom: 32px;
}
.page-badge {
  display: inline-block;
  background: var(--clr-tag-bg);
  color: var(--clr-tag-text);
  font-size: .78rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 99px;
  margin-bottom: 8px;
}
.page-head h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  margin-bottom: 6px;
}
.page-head p { font-size: .9rem; color: var(--clr-text-sub); }

/* -- 書籍詳細 -- */
.book-detail {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 36px;
  margin-bottom: 56px;
}
.book-detail-cover img {
  border-radius: var(--radius-md);
  box-shadow: 0 4px 20px rgba(0,0,0,.15);
  width: 200px;
  height: 300px;
  object-fit: cover;
}
.book-title {
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 2.5vw, 1.8rem);
  font-weight: 700;
  margin-bottom: 8px;
  line-height: 1.3;
}
.book-author, .book-publisher {
  font-size: .9rem;
  color: var(--clr-text-sub);
  margin-bottom: 4px;
}
.book-genres {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}
.book-scores {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  margin: 20px 0;
  padding: 16px 20px;
  background: var(--clr-accent-bg);
  border-radius: var(--radius-md);
  border: 1px solid var(--clr-border);
}
.score-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}
.score-label {
  font-size: .72rem;
  color: var(--clr-text-sub);
  font-weight: 500;
}
.score-value { font-size: 1.1rem; font-weight: 700; }
.score-total { color: var(--clr-accent); }
.score-sub { font-size: .7rem; color: var(--clr-text-sub); }
.book-overview {
  margin-bottom: 24px;
}
.book-overview h2 {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--clr-accent);
}
.book-overview p {
  font-size: .92rem;
  line-height: 1.9;
  color: var(--clr-text-sub);
}
.amazon-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--clr-amazon);
  color: #fff !important;
  font-weight: 700;
  font-size: .95rem;
  padding: 13px 28px;
  border-radius: var(--radius-md);
  text-decoration: none !important;
  transition: background var(--transition), transform var(--transition);
  box-shadow: 0 2px 8px rgba(255,153,0,.3);
}
.amazon-btn:hover {
  background: var(--clr-amazon-dk);
  transform: translateY(-2px);
}

/* -- 関連書籍 -- */
.related-books {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--clr-border);
}
.related-books h2 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 16px;
}

/* -- 状況別特集 -- */
.hero-compact { padding: 48px 20px 36px; }
.hero-badge, .feature-badge {
  display: inline-block;
  background: var(--clr-accent-bg);
  color: var(--clr-accent);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .08em;
  padding: 4px 12px;
  border-radius: 99px;
  margin-bottom: 14px;
}
.hero-accent { color: var(--clr-accent); }
.hero-title-main { color: var(--clr-text); }
.hero-has-bg {
  position: relative;
  color: #fff;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-bg-panel {
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  filter: blur(6px);
  transform: scale(1.08);
}
.hero-bg-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(44,40,37,.72), rgba(44,40,37,.88));
  z-index: 1;
}
.hero-has-bg .hero-inner { position: relative; z-index: 2; }
.hero-has-bg .hero-accent,
.hero-has-bg .hero-title-main,
.hero-has-bg .hero-sub,
.hero-has-bg .hero-updated { color: #fff; }
.hero-has-bg .hero-badge {
  background: rgba(255,255,255,.16);
  color: #fff;
}
.feature-links { margin: 56px 0 40px; }
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}
.feature-card {
  position: relative;
  min-height: 220px;
  padding: 24px 20px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--clr-surface-2), var(--clr-accent-bg));
  background-size: cover;
  background-position: center;
  color: var(--clr-text);
  text-decoration: none !important;
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition);
}
.feature-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(250,248,245,.15), rgba(250,248,245,.92));
}
.feature-card > * { position: relative; z-index: 1; }
.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}
.feature-card h2,
.feature-card h3 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  line-height: 1.5;
  margin: 8px 0;
}
.feature-card p {
  font-size: .88rem;
  color: var(--clr-text-sub);
  line-height: 1.6;
}
.feature-more {
  text-align: center;
  margin-top: 16px;
  font-size: .9rem;
}
.aio-summary {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  margin-bottom: 28px;
  font-size: .92rem;
  color: var(--clr-text-sub);
  line-height: 1.8;
}

.feature-fit {
  margin: -8px 0 32px;
  padding: 18px 0 0;
  border-top: 1px solid var(--clr-border);
}
.feature-fit-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0 0 14px;
  color: var(--clr-text);
}
.feature-fit-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}
@media (min-width: 640px) {
  .feature-fit-grid { grid-template-columns: repeat(3, 1fr); }
}
.feature-fit-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
}
.feature-fit-card h3 {
  font-size: .8rem;
  font-weight: 700;
  color: var(--clr-accent, #b45309);
  letter-spacing: .02em;
  margin: 0 0 10px;
}
.feature-fit-card ul {
  margin: 0;
  padding: 0 0 0 1.1em;
  color: var(--clr-text-sub);
  font-size: .85rem;
  line-height: 1.7;
}
.feature-fit-card li { margin-bottom: 6px; }
.feature-fit-card-muted {
  background: transparent;
  border-style: dashed;
}
.feature-fit-card-muted h3 { color: var(--clr-text-sub); opacity: .85; }
.feature-fit-card-muted ul { color: var(--clr-text-sub); opacity: .85; }

.curated-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.curated-item {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 16px;
  padding: 16px;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  text-decoration: none !important;
  color: inherit;
  transition: box-shadow var(--transition), transform var(--transition);
}
.curated-item:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}
.curated-cover img,
.curated-cover .cover-fallback {
  width: 96px;
  height: 144px;
  border-radius: var(--radius-sm);
  object-fit: cover;
}
.curated-body h3 {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  margin-bottom: 4px;
}
.curated-author {
  font-size: .85rem;
  color: var(--clr-text-sub);
  margin-bottom: 8px;
}
.curated-comment {
  margin-top: 10px;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--clr-text-sub);
}
.back-link { margin-top: 32px; }
.back {
  font-size: .9rem;
  color: var(--clr-text-sub);
}

/* -- 実践例 -- */
.practice-badge {
  display: inline-block;
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .04em;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--clr-accent-bg);
  color: var(--clr-accent);
}
.practice-card-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}
.practice-card {
  display: block;
  padding: 20px 18px;
  border-radius: var(--radius-md);
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  text-decoration: none !important;
  color: inherit;
  transition: box-shadow var(--transition), transform var(--transition);
}
.practice-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}
.practice-card h3 {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  margin: 10px 0 8px;
  line-height: 1.5;
}
.practice-card p {
  font-size: .88rem;
  color: var(--clr-text-sub);
  line-height: 1.6;
}
.practice-links { margin: 56px 0 40px; }
.practice-genre-block { margin-bottom: 40px; }
.practice-genre-title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  margin-bottom: 16px;
}
.practice-article { padding-bottom: 48px; }
.practice-header { margin: 24px 0 28px; }
.practice-header h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 4vw, 2rem);
  line-height: 1.45;
  margin: 12px 0;
}
.practice-lead {
  font-size: 1.05rem;
  color: var(--clr-text-sub);
  line-height: 1.8;
}
.practice-updated {
  margin-top: 12px;
  font-size: .82rem;
  color: var(--clr-text-muted);
}
.practice-body p {
  margin-bottom: 1.1em;
  line-height: 1.9;
  color: var(--clr-text);
}
.practice-disclaimer {
  margin: 28px 0;
  padding: 14px 16px;
  font-size: .85rem;
  color: var(--clr-text-sub);
  background: var(--clr-surface-2);
  border-radius: var(--radius-sm);
}
.practice-related h2,
.practice-notes-on-book h2 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  margin-bottom: 16px;
}
.practice-book-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.practice-book-card {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 14px;
  padding: 12px;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  text-decoration: none !important;
  color: inherit;
  background: var(--clr-surface);
}
.practice-book-card:hover { box-shadow: var(--shadow-card); }
.practice-book-cover img,
.practice-book-cover .cover-fallback {
  width: 72px;
  height: 108px;
  border-radius: var(--radius-sm);
  object-fit: cover;
}
.practice-book-meta h3 {
  font-size: .98rem;
  margin-bottom: 4px;
  line-height: 1.45;
}
.practice-book-meta p {
  font-size: .85rem;
  color: var(--clr-text-sub);
}
.practice-note-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.practice-note-links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: .95rem;
}
.practice-notes-on-book { margin-top: 40px; }

/* -- フッター -- */
.footer {
  background: var(--clr-text);
  color: rgba(255,255,255,.7);
  margin-top: 0;
}
.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 20px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-logo {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: #fff;
  font-weight: 700;
}
.footer-tagline { font-size: .88rem; }
.footer-nav {
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
}
.footer-nav a { color: rgba(255,255,255,.7); font-size: .82rem; }
.footer-nav a:hover { color: #fff; text-decoration: none; }
.footer-note { font-size: .75rem; opacity: .6; }
.footer-sisters { font-size: .75rem; opacity: .65; }
.footer-sisters a { color: rgba(255,255,255,.7); }
.footer-sisters a:hover { color: #fff; text-decoration: none; }
.footer-copy { font-size: .75rem; opacity: .5; }

/* -- レスポンシブ -- */
@media (max-width: 680px) {
  .book-detail {
    grid-template-columns: 1fr;
  }
  .book-detail-cover {
    display: flex;
    justify-content: center;
  }
  .sort-box { margin-left: 0; }
  .hero { padding: 48px 16px 36px; }
  .grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 14px; }
}
@media (max-width: 420px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
}