/* こよいの本棚 — 枕元の読書灯の下で、背表紙から1冊えらぶ */
:root {
  --night: #1b2036;
  --night-2: #232946;
  --night-3: #2c3354;
  --paper: #f1e9d8;      /* 見出し */
  --text: #e2dacb;       /* 本文 */
  --paper-sub: #c4b9a8;  /* 著者名・日付・PR表記などの補助 */
  --card: #262d4d;
  --lamp: #e8b96a;
  --lamp-deep: #c9953f;
  --line: rgba(241, 233, 216, 0.22);
  --board: #5a4632;

  /* 棚ごとの背表紙の色 */
  --sp-tsukare: #8f82b5;   /* 藤 */
  --sp-sabishii: #c98d9c;  /* 薄紅 */
  --sp-ochikomi: #6c9fa6;  /* 浅葱 */
  --sp-kangae: #94a878;    /* 若草 */
  --sp-naki: #cfa9a0;      /* 灰桜 */
  --sp-ganbari: #c39b5c;   /* 金茶 */
  --sp-nemure: #7f8aa8;    /* 鈍色 */

  --f-head: "Zen Old Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  --f-body: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;  /* 10/22 Zen Kaku Gothic Newは仮名の字間が広く読みにくかったので変更 */
  --measure: 40rem;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--night);
  color: var(--text);
  font-family: var(--f-body);
  -webkit-font-smoothing: antialiased;
  font-size: 1rem;
  line-height: 1.85;
  letter-spacing: 0.02em;
}

/* 読書灯の光。background-attachment: fixed はiOSで効かずAndroidで重いので固定レイヤーで置く */
body::before {
  content: ""; position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background: radial-gradient(60rem 40rem at 12% -10%, rgba(232, 185, 106, 0.08), transparent 60%);
}

.vh { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap; }

h1, h2, h3 { color: var(--paper); word-break: auto-phrase; overflow-wrap: anywhere; text-wrap: balance; }

a { color: var(--lamp); text-underline-offset: 0.2em; }
a:hover { color: var(--paper); }
:focus-visible { outline: 2px solid var(--lamp); outline-offset: 3px; border-radius: 2px; }

.skip-link { position: absolute; left: -999px; top: 0; background: var(--lamp); color: var(--night); padding: 0.5rem 1rem; z-index: 10; }
.skip-link:focus { left: 1rem; top: 1rem; }

.wrap { width: min(100% - 2rem, 62rem); margin-inline: auto; }
.wrap-text { width: min(100% - 2rem, var(--measure)); margin-inline: auto; }

/* ヘッダー */
.site-header { padding: 1.1rem 0; border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; }
.site-name { font-family: var(--f-head); font-size: 1.15rem; font-weight: 700; color: var(--paper); text-decoration: none; letter-spacing: 0.12em; }
.site-name:hover { color: var(--lamp); }
.site-header nav a { font-size: 0.9rem; color: var(--paper-sub); display: inline-block; padding: 0.6rem 0; }

/* PR表記 */
.pr-note { font-size: 0.875rem; color: var(--paper-sub); line-height: 1.7; margin: 1rem 0 0; }
.pr-note b { display: inline-block; border: 1px solid var(--paper-sub); border-radius: 3px; padding: 0 0.35em; margin-right: 0.5em; font-weight: 400; line-height: 1.5; }

/* トップ:見出しと本棚 */
.hero { padding: 2rem 0 0; display: grid; gap: 2.5rem; align-items: end; }
.hero h1 { font-family: var(--f-head); font-weight: 700; font-size: clamp(1.9rem, 5.5vw, 2.9rem); line-height: 1.45; letter-spacing: 0.08em; margin: 0 0 1rem; white-space: pre-line; }
.hero-lead { margin: 0; max-width: 26rem; }

.shelf { position: relative; padding: 0 0.5rem; display: flex; flex-direction: column; }
.shelf-row { min-width: 0; display: flex; align-items: flex-end; justify-content: center; gap: clamp(0.2rem, 1vw, 0.35rem); list-style: none; margin: 0; padding: 0; }
.shelf-hint { order: 3; margin: 0.9rem 0 0; text-align: center; font-size: 0.875rem; color: var(--paper-sub); }
.shelf::after { order: 2; content: ""; display: block; height: 0.8rem; margin: 0 -0.5rem; background: linear-gradient(var(--board), #3e3024); border-radius: 2px; box-shadow: 0 10px 24px rgba(0, 0, 0, 0.35); }

.spine {
  display: flex; flex-direction: column; align-items: center; justify-content: space-between;
  width: clamp(2.2rem, 11vw, 3.6rem);
  padding: 0.9rem 0 0.8rem;
  border-radius: 3px 3px 0 0;
  background: var(--c);
  color: var(--night);
  text-decoration: none;
  box-shadow: inset -6px 0 0 rgba(0, 0, 0, 0.12), inset 2px 0 0 rgba(255, 255, 255, 0.18);
  transition: transform 0.2s ease;
}
.spine:hover, .spine:focus-visible { transform: translateY(-0.6rem); color: var(--night); }
.spine:focus-visible { outline-color: var(--paper); outline-offset: 4px; }
.spine-title { writing-mode: vertical-rl; font-family: var(--f-head); font-weight: 700; font-size: clamp(0.92rem, 3.6vw, 1.1rem); letter-spacing: 0.14em; line-height: 1; }
.spine-band { width: 60%; height: 3px; background: rgba(27, 32, 54, 0.55); border-radius: 2px; }
.shelf-row li:nth-child(odd) .spine-band { width: 40%; }

/* 棚(気分ごとのセクション) */
.shelves { padding: 3rem 0 2rem; }
.mood { padding: 3rem 0 0.5rem; scroll-margin-top: 1rem; }
.mood-head { display: flex; gap: 1rem; align-items: stretch; margin-bottom: 1rem; padding: 1rem 1rem 1rem 0; border-radius: 4px; background: var(--card); background: color-mix(in srgb, var(--c) 14%, transparent); }
.mood-head::before { content: ""; flex: none; width: 0.55rem; border-radius: 2px; background: var(--c); }
.mood h2 { font-family: var(--f-head); font-size: clamp(1.35rem, 3.6vw, 1.7rem); line-height: 1.5; margin: 0; letter-spacing: 0.06em; }
.mood-intro { margin: 0.25rem 0 0; }

.book-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0 2.5rem; }
.book-row { padding: 1rem 0 1rem 0.9rem; border-bottom: 1px solid var(--line); border-left: 3px solid var(--c); margin-top: 0.4rem; }
.book-row h3 { font-family: var(--f-head); font-size: 1.3rem; margin: 0; line-height: 1.5; }
.book-row p { margin: 0.2rem 0; }
.row-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0 0.6rem; }
.book-row .by { font-size: 0.875rem; color: var(--paper-sub); margin: 0; }
.book-row .tagline { font-size: 1rem; }
.row-note { font-size: 0.875rem; color: var(--paper-sub); }
.book-links { display: flex; flex-wrap: wrap; align-items: center; gap: 0.25rem 1.25rem; margin-top: 0.4rem; font-size: 0.92rem; }

/* 棚の残りの本(折りたたみ) */
.more-books { margin-top: 0.75rem; }
.more-books summary {
  display: inline-block; cursor: pointer; padding: 0.6rem 1rem; min-height: 44px;
  border: 1px solid var(--paper-sub); border-radius: 999px; color: var(--text); font-size: 0.92rem;
}
.more-books summary::-webkit-details-marker { display: none; }
.more-books summary::before { content: "＋ " / ""; color: var(--c); font-weight: 700; }
.more-books[open] summary::before { content: "− " / ""; }
.more-books summary:hover { border-color: var(--paper-sub); }

/* サイト内のページへのリンクと、Amazonへのリンクを見た目で分ける */
.link-page { display: inline-block; padding: 0.6rem 0; color: #e6d3ad; text-decoration: underline; text-underline-offset: 0.25em; }
.link-page:hover { color: var(--paper); }

/* 本のページ */
.crumbs { font-size: 0.875rem; color: var(--paper-sub); margin: 1.5rem 0 0; }
.crumbs a { color: var(--paper-sub); }
.page-head { padding: 2rem 0 1rem; }
.page-head h1 { font-family: var(--f-head); font-size: clamp(1.6rem, 4.8vw, 2.3rem); line-height: 1.5; letter-spacing: 0.05em; margin: 0 0 1rem; }
.updated { font-size: 0.875rem; color: var(--paper-sub); margin: 0; }

.toc { margin: 1.25rem 0 1.5rem; }
.toc h2 { font-family: var(--f-head); font-size: 1.05rem; margin: 0 0 0.5rem; }
.toc ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.5rem; }
.toc a {
  display: block; padding: 0.55rem 0.8rem; border-left: 4px solid var(--c); border-radius: 0 4px 4px 0;
  background: var(--card); color: var(--text); text-decoration: none;
}
.toc a:hover { color: var(--paper); }
.toc-title { display: block; font-family: var(--f-head); font-weight: 700; color: var(--paper); }
.toc-night { display: block; font-size: 0.875rem; color: var(--paper-sub); }

.anchor { margin: 1.5rem 0 1rem; padding: 1.25rem; background: var(--card); border-radius: 6px; border: 1px solid var(--line); }
.anchor h2 { font-family: var(--f-head); font-size: 1.2rem; margin: 0 0 0.5rem; }
.anchor p { margin: 0.5rem 0; }

.pick { display: grid; grid-template-columns: 1fr; gap: 0.9rem; padding: 2.25rem 0; border-bottom: 1px solid var(--line); scroll-margin-top: 1rem; }
.pick-spine {
  width: 100%; height: 0.4rem; border-radius: 2px;
  background: var(--c); color: var(--night);
  display: flex; justify-content: center;
  box-shadow: inset -6px 0 0 rgba(0, 0, 0, 0.12), inset 2px 0 0 rgba(255, 255, 255, 0.18);
}
.pick-spine span { display: none; writing-mode: vertical-rl; font-family: var(--f-head); font-weight: 700; font-size: 1rem; letter-spacing: 0.12em; line-height: 1; }
.pick h2 { font-family: var(--f-head); font-size: 1.3rem; line-height: 1.5; margin: 0; }
.pick .by { font-size: 0.875rem; color: var(--paper-sub); margin: 0.15rem 0 0; }
.pick .note { font-size: 0.875rem; color: var(--paper-sub); padding: 0.6rem 0.8rem; background: var(--card); border-radius: 4px; }
.pick-more { margin: 0.9rem 0 0; }
.pick .night { margin: 0.9rem 0 0.4rem; padding-left: 0.9rem; border-left: 3px solid var(--c); font-family: var(--f-head); font-size: 1.1rem; color: var(--paper); }
.pick p { margin: 0.6rem 0; }

.btn-amazon {
  display: inline-block; margin-top: 0.6rem; padding: 0.6rem 1.2rem; border-radius: 999px;
  background: var(--lamp); color: var(--night); font-weight: 700; font-size: 0.92rem; text-decoration: none;
}
.btn-amazon:hover { background: var(--paper); color: var(--night); }
.btn-line {
  display: inline-flex; align-items: center; min-height: 44px; padding: 0 1rem; border-radius: 999px;
  border: 1px solid var(--lamp); color: var(--lamp); font-size: 0.875rem; font-weight: 700; text-decoration: none;
}
.btn-line:hover { background: var(--lamp); color: var(--night); }

.ku { margin: 2.5rem 0; padding: 1.5rem; border: 1px solid var(--lamp-deep); border-radius: 6px; }
.ku h2 { font-family: var(--f-head); font-size: 1.15rem; margin: 0 0 0.5rem; }
.ku p { margin: 0.4rem 0; font-size: 0.95rem; }

.more { padding: 2rem 0 1rem; }
.more h2 { font-family: var(--f-head); font-size: 1.15rem; margin: 0 0 0.75rem; }
.more ul { margin: 0; padding-left: 1.2rem; }

/* 文章ページ(プライバシーなど) */
.doc h1 { font-family: var(--f-head); font-size: 1.7rem; margin: 2rem 0 1rem; }
.doc h2 { font-family: var(--f-head); font-size: 1.15rem; margin: 2rem 0 0.5rem; }

/* フッター */
.site-footer { margin-top: 3rem; padding: 2rem 0 5rem; border-top: 1px solid var(--line); font-size: 0.875rem; color: var(--paper-sub); line-height: 1.8; }
.site-footer p { margin: 0.35rem 0; }
.site-footer a { color: var(--paper-sub); display: inline-block; padding: 0.6rem 0; }

.help-line { margin: 0 0 1rem; padding: 0.4rem 0.8rem; font-size: 0.875rem; color: var(--paper-sub); border-left: 2px solid var(--paper-sub); }

/* 気分の棚へ戻るボタン(スマホ幅だけ) */
.fab {
  position: fixed; right: 1rem; bottom: 1rem; z-index: 5;
  display: inline-flex; align-items: center; padding: 0 0.95rem; border-radius: 999px; min-height: 44px;
  background: rgba(27, 32, 54, 0.92); backdrop-filter: blur(6px); color: var(--paper); border: 1px solid var(--paper-sub);
  font-size: 0.85rem; font-weight: 700; text-decoration: none; box-shadow: 0 6px 18px rgba(0, 0, 0, 0.4);
}
@media (max-width: 47.99rem) {
  body:has(.fab-nav) { padding-bottom: 4.5rem; }
  html:has(.fab-nav) { scroll-padding-bottom: 5rem; }
}
.fab:hover { color: var(--lamp); }

@media (min-width: 48rem) {
  .hero { grid-template-columns: 1fr 1.1fr; padding-top: 4.5rem; }
  .book-list { grid-template-columns: 1fr 1fr; }
  .pick { grid-template-columns: 3.4rem 1fr; gap: 1.75rem; }
  .pick-spine { width: 3.4rem; height: auto; min-height: 11rem; padding: 0.9rem 0; border-radius: 3px; }
  .pick-spine span { display: block; }
  .fab { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .spine { transition: none; }
  .spine:hover, .spine:focus-visible { transform: none; }
}