/* ── Fonts ── */
  @font-face {
    font-family: "EB Garamond";
    src: url("/fonts/eb-garamond-roman.woff2") format("woff2");
    font-weight: 400; font-display: swap;
  }
  @font-face {
    font-family: "EB Garamond";
    src: url("/fonts/eb-garamond-italic.woff2") format("woff2");
    font-weight: 400; font-style: italic; font-display: swap;
  }
  @font-face {
    font-family: "Departure Mono";
    src: url("/fonts/DepartureMono-Regular.otf") format("opentype");
    font-weight: 400;
    font-display: swap;
  }
  @font-face {
    font-family: "JetBrains Mono";
    src: url("/fonts/jetbrains-mono-roman.woff2") format("woff2");
    font-weight: 400;
    font-display: swap;
  }
  @font-face {
    font-family: "Rubik Glitch";
    src: url("/fonts/RubikGlitch-Regular.ttf") format("truetype");
    font-weight: 400;
    font-display: swap;
  }

  :root {
    --bg: #F4EFE4;
    --card-bg: #FBF8F2;
    --text: #3A3632;
    --text-light: #8A847C;
    --text-mid: #5E5850;
    --border: #E6DED1;
    --accent: #6B8CAE;
    --accent-soft: rgba(107, 140, 174, 0.10);
    --radius: 14px;
  }

  * { box-sizing: border-box; margin: 0; padding: 0; }
  ::selection { background: var(--accent-soft); }

  body {
    background: var(--bg);
    font-family: "EB Garamond", Georgia, serif;
    color: var(--text);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
  }

  /* Paper grain texture */
  body::before {
    content: "";
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    pointer-events: none; z-index: 9999;
    opacity: 0.04;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 512 512' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='5' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-size: 300px 300px;
    mix-blend-mode: multiply;
  }

  /* ═══════ Header ═══════ */
  .site-header {
    max-width: 1200px;
    margin: 0 auto;
    padding: 32px 56px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }
  .site-logo {
    font-family: "Rubik Glitch", monospace;
    font-size: 1.5rem;
    letter-spacing: 0.18em;
    color: #2F2B26;
    text-decoration: none;
    transform: scaleY(0.9) scaleX(0.95);
    display: inline-block;
    text-shadow: 3px 2px 0 rgba(170,130,90,0.2), -2px -1px 0 rgba(220,195,165,0.15);
    animation: subtle-glitch 2s infinite;
  }
  @keyframes subtle-glitch {
    0%, 94%, 100% { transform: scaleY(0.9) scaleX(0.95) translate(0); }
    95% { transform: scaleY(0.9) scaleX(0.95) translate(-0.5px, 0.3px); }
    96% { transform: scaleY(0.9) scaleX(0.95) translate(0.5px, -0.3px); }
    97% { transform: scaleY(0.9) scaleX(0.95) translate(-0.3px, 0); }
  }
  .header-nav {
    display: flex; align-items: center; gap: 28px; list-style: none;
  }
  .header-nav a {
    font-family: "JetBrains Mono", monospace;
    font-size: 0.6rem; letter-spacing: 3.5px;
    text-transform: uppercase; color: #70695F;
    text-decoration: none; transition: color 0.3s;
  }
  .header-nav a:hover { color: #2F2B26; }
  .nav-dot { width: 4px; height: 4px; background: #8B8D72; border-radius: 50%; }
  .header-rule {
    max-width: 1200px;
    margin: 18px auto 0; padding: 0 56px;
  }
  .header-rule hr { border: none; border-top: 1px solid rgba(80, 70, 55, 0.15); }

  /* ═══════ Three-Column Editorial Layout ═══════ */
  .editorial {
    max-width: 1200px;
    margin: 0 auto;
    padding: 48px 56px 0;
    display: grid;
    grid-template-columns: 200px 1fr 220px;
    gap: 48px;
    align-items: start;
  }

  /* ── Left Column: Reading Note Intro ── */
  .col-left {
    position: sticky;
    top: 48px;
    padding-right: 0;
  }
  .col-left-eyebrow {
    font-family: "JetBrains Mono", monospace;
    font-size: 0.5rem;
    letter-spacing: 4.5px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 20px;
  }
  .col-left-subtitle {
    font-family: "EB Garamond", Georgia, serif;
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-mid);
    font-style: italic;
    margin-bottom: 28px;
  }
  /* Botanical ornament — same style as homepage */
  .col-left-ornament {
    width: 72px;
    height: 96px;
    opacity: 0.35;
    margin: 0 auto 0 0;
  }
  .breadcrumb {
    font-family: "JetBrains Mono", monospace;
    font-size: 0.52rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text-light);
    margin-top: 28px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
  }
  .breadcrumb a {
    color: var(--text-light);
    text-decoration: none;
    transition: color 0.3s;
  }
  .breadcrumb a:hover { color: var(--accent); }
  .breadcrumb .sep { margin: 0 6px; opacity: 0.4; }

  /* ── Center Column: Chapter List ── */
  .col-center {}
  .book-title {
    font-family: "EB Garamond", Georgia, serif;
    font-size: 3rem;
    font-weight: 400;
    line-height: 1.08;
    color: var(--text);
    margin-bottom: 10px;
  }
  .book-byline {
    font-family: "JetBrains Mono", monospace;
    font-size: 0.6rem;
    letter-spacing: 2.5px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 4px;
  }
  .book-year {
    font-family: "JetBrains Mono", monospace;
    font-size: 0.68rem;
    color: var(--text-light);
    margin-bottom: 16px;
  }
  .book-avatar {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 28px;
    padding-bottom: 28px;
    border-bottom: 1px solid var(--border);
  }
  .avatar-circle {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: "EB Garamond", serif;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-mid);
  }
  .avatar-meta-name {
    font-family: "JetBrains Mono", monospace;
    font-size: 0.55rem;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--text);
  }
  .avatar-meta-date {
    font-family: "JetBrains Mono", monospace;
    font-size: 0.52rem;
    color: var(--text-light);
    letter-spacing: 1px;
  }

  /* Chapter list */
  .chapter-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
  }
  .ch-card {
    display: flex;
    align-items: baseline;
    gap: 14px;
    padding: 12px 16px;
    border-radius: 8px;
    border: 1px solid transparent;
    text-decoration: none;
    color: inherit;
    transition: all 0.25s ease;
  }
  .ch-card:hover {
    background: var(--card-bg);
    border-color: var(--border);
    transform: translateX(4px);
  }
  .ch-num {
    font-family: "JetBrains Mono", monospace;
    font-size: 0.55rem;
    letter-spacing: 1.5px;
    color: var(--text-light);
    white-space: nowrap;
    min-width: 36px;
  }
  .ch-title {
    font-family: "EB Garamond", Georgia, serif;
    font-size: 1.05rem;
    color: var(--text);
    line-height: 1.4;
  }
  .ch-card:hover .ch-title { color: var(--accent); }

  /* ── Right Column: Book Sidebar ── */
  .col-right {
    position: sticky;
    top: 48px;
  }
  .sidebar-frame {
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    background: var(--card-bg);
    box-shadow: 0 2px 8px rgba(47, 43, 38, 0.06);
  }
  .sidebar-cover {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 3px 10px rgba(47, 43, 38, 0.08);
    margin-bottom: 16px;
    line-height: 0;
  }
  .sidebar-cover img {
    width: 100%;
    display: block;
  }
  .sidebar-meta {
    font-family: "JetBrains Mono", monospace;
    font-size: 0.6rem;
    color: var(--text-light);
    margin-bottom: 14px;
    letter-spacing: 0.5px;
  }
  .sidebar-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 18px;
  }
  .sidebar-tag {
    font-family: "JetBrains Mono", monospace;
    font-size: 0.5rem;
    letter-spacing: 0.8px;
    text-transform: lowercase;
    color: var(--text-mid);
    background: rgba(107, 140, 174, 0.07);
    padding: 3px 10px;
    border-radius: 100px;
    border: none;
  }
  .sidebar-desc {
    font-size: 0.9rem;
    line-height: 1.7;
    color: var(--text-mid);
    margin-bottom: 20px;
    font-style: italic;
  }
  .sidebar-link {
    font-family: "Departure Mono", monospace;
    font-size: 0.58rem;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: var(--accent);
    text-decoration: none;
    transition: opacity 0.3s;
  }
  .sidebar-link:hover { opacity: 0.7; }

  /* ═══════ Footer ═══════ */
  .site-footer {
    max-width: 1200px;
    margin: 0 auto;
    padding: 60px 56px 48px;
  }
  .footer-rule {
    border: none;
    border-top: 1px solid var(--border);
    margin-bottom: 32px;
  }
  .footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
  }
  .footer-quote-left {
    font-size: 0.88rem;
    font-style: italic;
    color: var(--text-mid);
    line-height: 1.7;
    max-width: 480px;
    white-space: nowrap;
  }

  .footer-right-sec {
    display: flex; align-items: baseline; gap: 24px;
  }
  .footer-copy, .footer-author {
    font-family: "JetBrains Mono", monospace;
    font-size: 0.5rem; letter-spacing: 1.5px;
    color: var(--text-light); text-transform: uppercase;
  }
  .footer-author {
    font-family: "EB Garamond", serif;
    font-size: 0.85rem; letter-spacing: 0;
    text-transform: none; font-style: italic;
  }

  /* ═══════ Responsive ═══════ */
  @media (max-width: 1000px) {
    .editorial {
      grid-template-columns: 1fr 200px;
      gap: 36px;
    }
    .col-left { display: none; }
  }
  @media (max-width: 768px) {
    .editorial {
      grid-template-columns: 1fr;
      padding: 32px 28px 0;
      gap: 32px;
    }
    .col-left { display: none; }
    .col-center { padding-left: 0; }
    .col-right {
      position: static;
      padding-left: 0;
      display: grid;
      grid-template-columns: 120px 1fr;
      gap: 20px;
      align-items: start;
    }
    .sidebar-cover { margin-bottom: 0; }
    .sidebar-tags { margin-bottom: 12px; }
    .site-header nav { display: none; }
    .site-header { padding: 24px 28px 0; }
    .header-rule { padding: 0 28px; }
    .site-footer { padding: 40px 28px 36px; }
    .footer-bottom { flex-direction: column; gap: 12px; }
    .footer-quote-left { white-space: normal; font-size: 0.82rem; max-width: 100%; }
    .book-title { font-size: 2.4rem; }
  }
  @media (max-width: 580px) {
    .site-header { padding: 20px 20px 0; }
    .header-rule { padding: 0 20px; }
    .editorial { padding: 24px 20px 0; }
    .col-right { grid-template-columns: 1fr; }
    .site-footer { padding: 32px 20px 28px; }
    .book-title { font-size: 2rem; }
  }

/* Shared book shell reuses the existing Marginalia stylesheet above. */
.rn-book main.col-center{max-width:none;margin:0;padding:0;min-width:0;font-family:"EB Garamond",Georgia,"Songti SC","Noto Serif CJK SC",serif;line-height:1.75}
.rn-book .editorial{grid-template-columns:200px minmax(0,1fr) 220px}
.rn-book .book-title{font-size:48px;line-height:1.08;font-weight:400;margin:0 0 10px}
.rn-book .header-nav a{font-size:9.6px;letter-spacing:3.5px;color:#70695F}
.rn-book .col-left-subtitle{margin:0 0 28px}
.rn-book .sidebar-desc{margin:0 0 20px}
.rn-book .sidebar-cover img{height:auto}
.rn-book .ch-num{font-size:8.8px;color:var(--text-light)}
.rn-book .ch-title{display:grid;grid-template-columns:64px auto;align-items:baseline;gap:12px}
.rn-book .ch-title small{font:11px "JetBrains Mono",monospace;color:#70695F;margin-left:0}
.rn-explore{font:12px "JetBrains Mono",monospace;gap:12px 20px;margin-bottom:14px}
.rn-count{font:11px "JetBrains Mono",monospace;color:var(--text-light);margin:0 0 12px}
.rn-about{margin-top:30px;padding-top:18px;border-top:1px solid var(--border);font-size:15px;line-height:1.9}
.rn-about summary{cursor:pointer;color:var(--text-mid);font-size:13px}
.rn-book .site-footer span,.rn-chapter .site-footer span{float:none}
/* Chapter reading geometry and palette match the existing chapter family. */
body.rn-chapter{--bg:#F5F2EE;--text:#2E2824;--text-light:#7A6E68;--text-mid:#7A6E68;--border:#D8D0C8;--card-bg:#FDFCFB;background:var(--bg);font-family:Georgia,"Times New Roman","Songti SC","Noto Serif CJK SC",serif;line-height:1.85}
.rn-chapter::before{display:none}
.rn-chapter main.container{max-width:900px;margin:0 auto;padding:40px 30px 100px;font-family:inherit;line-height:1.85}
.rn-chapter .chapter-nav{justify-content:space-between;align-items:center;gap:8px 16px;padding:12px 0;margin-bottom:20px;font:11.5px Inter,-apple-system,sans-serif;line-height:1.85}
.rn-chapter a{color:#7D6B5A}
.rn-chapter .cover-strip{display:flex;gap:14px;align-items:center;margin-bottom:28px;padding-bottom:22px;border-bottom:1px solid var(--border)}
.rn-chapter .cover-thumb{width:44px;height:64px;object-fit:cover;border-radius:3px;box-shadow:2px 2px 8px #00000019;display:block}
.rn-chapter .cover-book{font:700 12px Inter,-apple-system,sans-serif}
.rn-chapter .cover-ch{font:11px Inter,-apple-system,sans-serif;color:#9B8B7E;margin-top:2px}
.rn-chapter h1{font:700 48px/1.08 Georgia,"Songti SC","Noto Serif CJK SC",serif;letter-spacing:-.03em;margin:0 0 4px}
.rn-chapter h1 span{font-size:.6em;color:#7D6B5A}
.rn-chapter .byline{font:italic 13.5px/1.85 Inter,-apple-system,sans-serif;color:#9B8B7E;margin:8px 0 0}
.rn-chapter-heading{margin-bottom:24px}
.rn-chapter .annotation{max-width:none;padding:24px 0;scroll-margin-top:20px}
.rn-chapter .annotation p:not(.locator){font-size:15px;line-height:28.5px;margin:14px 0}
.rn-chapter .annotation h2{font:600 19px/1.5 Georgia,"Songti SC","Noto Serif CJK SC",serif;color:var(--text);margin:0 0 12px}
.rn-chapter .locator{font-size:12px;color:#66594F;margin:0 0 18px}
.rn-chapter .small{font-size:11px;line-height:1.8}
.rn-chapter .contents{margin:22px 0 8px;padding:16px 20px;background:#F0EBE5;border-color:#D8D0C8;font-size:13px;line-height:1.9;scroll-margin-top:20px}
.rn-chapter .contents summary{cursor:pointer}
.rn-chapter .contents ol{margin-top:12px}
.rn-chapter .related{font-size:12px}
.rn-back-contents{display:inline-block;margin-top:12px;font:11px/1.8 Inter,-apple-system,sans-serif;text-decoration:none}
.rn-chapter .sources h2{font:700 12px/1.8 Inter,-apple-system,sans-serif;text-transform:uppercase;letter-spacing:.1em;border-bottom:1px solid var(--border);padding-bottom:7px}
.rn-chapter .sources li{margin:8px 0;font-size:13px;line-height:1.8}
.rn-chapter .citation{display:inline-block;padding:0 3px;font-size:12px;color:#665043}
.rn-chapter .site-footer{max-width:900px;padding:0 30px 40px}
.rn-chapter .footer-quote-left{white-space:normal}
@media(max-width:1000px){.rn-book .editorial{grid-template-columns:minmax(0,1fr) 200px}}
@media(max-width:768px){.rn-book .editorial{grid-template-columns:minmax(0,1fr)}.rn-book .book-title{font-size:38.4px}.rn-book .site-header nav{display:none}.rn-book .col-right{display:block}.rn-book .sidebar-frame{max-width:350px}.rn-book .sidebar-cover{max-width:180px;margin-bottom:16px}.rn-chapter .contents ol{columns:1}}
@media(max-width:600px){.rn-chapter main.container{padding:25px 16px 80px}.rn-chapter h1{font-size:30px}.rn-chapter .site-footer{padding:0 16px 28px}}
@media(max-width:580px){.rn-book .book-title{font-size:32px}.rn-book .book-avatar{margin-bottom:20px;padding-bottom:20px}.rn-book .rn-explore{font-size:11px}}