:root {
  --paper:   #f7f3ec;
  --paper2:  #f0e9de;
  --paper3:  #e8dece;
  --ink:     #1c1710;
  --ink2:    #4a3f2f;
  --ink3:    #8a7a60;
  --ink4:    #b5a882;
  --gold:    #9a7b3c;
  --gold2:   #c9a55a;
  --border:  #d9cdb8;
  --border2: #c5b89e;
  --tag-bg:  #ede5d6;
  --tag-col: #7a5c28;
  --code-bg: #ede8df;
  --r: 6px;
  --ff-disp: 'Playfair Display', Georgia, serif;
  --ff-body: 'Source Serif 4', Georgia, serif;
  --ff-mono: 'JetBrains Mono', monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { background: var(--paper); color: var(--ink); font-family: var(--ff-body); font-size: 15px; font-weight: 300; line-height: 1.65; min-height: 100vh; }
a { color: inherit; text-decoration: none; }

/* NAV */
.nav {
  position: sticky; top: 0; z-index: 200;
  display: flex; align-items: center; gap: 14px;
  padding: 0 28px; height: 52px;
  background: rgba(247,243,236,.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav-logo {
  display: flex; align-items: center; gap: 8px;
  font-family: var(--ff-disp); font-size: 1.05rem; font-weight: 700;
  white-space: nowrap; letter-spacing: .01em;
}
.nav-logo svg { color: var(--gold); flex-shrink: 0; }
.nav-logo:hover { color: var(--gold); }

.nav-search {
  flex: 1; display: flex; align-items: center; gap: 8px;
  max-width: 340px; margin: 0 auto;
  background: var(--paper2); border: 1px solid var(--border);
  border-radius: 24px; padding: 6px 14px;
  transition: border-color .2s;
}
.nav-search:focus-within { border-color: var(--gold2); }
.nav-search svg { color: var(--ink4); flex-shrink: 0; }
#search {
  background: none; border: none; outline: none;
  font-family: var(--ff-body); font-size: .85rem; font-weight: 300;
  color: var(--ink); width: 100%;
}
#search::placeholder { color: var(--ink4); }

.nav-count { font-family: var(--ff-mono); font-size: .7rem; color: var(--ink4); white-space: nowrap; }

/* SEARCH DROP */
.search-drop {
  position: fixed; top: 52px; left: 50%; transform: translateX(-50%);
  width: min(560px, 94vw); max-height: 65vh; overflow-y: auto;
  background: var(--paper); border: 1px solid var(--border2);
  border-radius: 0 0 var(--r) var(--r);
  box-shadow: 0 8px 28px rgba(0,0,0,.08); z-index: 300;
}
.search-drop.hidden { display: none; }
.sr-item {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 10px 16px; border-bottom: 1px solid var(--border);
  cursor: pointer; transition: background .12s;
}
.sr-item:last-child { border-bottom: none; }
.sr-item:hover { background: var(--paper2); }
.sr-spine { width: 6px; min-height: 38px; border-radius: 2px; flex-shrink: 0; margin-top: 2px; }
.sr-body { flex: 1; min-width: 0; }
.sr-title { font-family: var(--ff-disp); font-size: .88rem; font-weight: 700; color: var(--ink); margin-bottom: 2px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sr-meta { font-family: var(--ff-mono); font-size: .65rem; color: var(--ink4); margin-bottom: 3px; }
.sr-preview { font-size: .77rem; color: var(--ink3); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.sr-empty { padding: 22px 16px; font-family: var(--ff-disp); font-style: italic; font-size: .85rem; color: var(--ink4); text-align: center; }

/* MAIN */
main { max-width: 1280px; margin: 0 auto; padding: 0 28px 80px; }

/* LIB HEADER */
.lib-header { padding: 44px 0 32px; border-bottom: 1px solid var(--border); margin-bottom: 44px; }
.lib-header h1 { font-family: var(--ff-disp); font-size: 2.6rem; font-weight: 700; letter-spacing: -.01em; margin-bottom: 6px; line-height: 1.1; }
.lib-meta { font-family: var(--ff-mono); font-size: .75rem; color: var(--ink4); letter-spacing: .04em; }

/* SHELF */
.shelf { margin-bottom: 52px; }
.shelf-head { display: flex; align-items: baseline; gap: 10px; margin-bottom: 18px; }
.shelf-label { font-family: var(--ff-mono); font-size: .68rem; font-weight: 500; text-transform: uppercase; letter-spacing: .14em; color: var(--ink3); }
.shelf-count { font-family: var(--ff-mono); font-size: .62rem; color: var(--ink4); }

.shelf-books { display: flex; flex-wrap: wrap; gap: 4px; align-items: flex-end; padding: 16px 8px 0; min-height: 130px; background: rgba(0,0,0,.015); border-radius: 2px 2px 0 0; }

/* BOOK */
.book {
  display: flex; flex-direction: column;
  cursor: pointer; text-decoration: none;
  transition: transform .2s cubic-bezier(.34,1.56,.64,1);
}
.book:hover { transform: translateY(-10px); }
.book:hover .spine { filter: brightness(1.15); box-shadow: 3px 0 12px rgba(0,0,0,.22); }

.spine {
  width: 38px;
  height: var(--h, 120px);
  background: var(--c, #2d4a3e);
  border-radius: 2px 5px 5px 2px;
  border-left: 5px solid rgba(0,0,0,.2);
  border-right: 1px solid rgba(255,255,255,.07);
  box-shadow: 2px 0 6px rgba(0,0,0,.16);
  display: flex; align-items: center; justify-content: center;
  padding: 10px 0;
  transition: filter .2s, box-shadow .2s;
  position: relative;
}
.spine::after {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: rgba(255,255,255,.12);
  border-radius: 0 5px 0 0;
}
.spine-text {
  font-family: var(--ff-disp); font-size: .6rem; font-weight: 700;
  writing-mode: vertical-rl; transform: rotate(180deg);
  color: rgba(255,255,255,.9); letter-spacing: .07em;
  max-height: calc(var(--h, 120px) - 24px);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  user-select: none;
}

/* PLANK */
.plank {
  height: 9px; margin-top: 0;
  background: linear-gradient(180deg,#a07830 0%,#7a5810 60%,#6a4808 100%);
  border-radius: 0 0 3px 3px;
  box-shadow: 0 3px 7px rgba(0,0,0,.17);
}

/* TAG */
.tag {
  display: inline-block; background: var(--tag-bg); color: var(--tag-col);
  font-family: var(--ff-mono); font-size: .62rem; padding: 2px 7px;
  border-radius: 20px; margin-right: 3px; margin-bottom: 3px;
  border: 1px solid rgba(154,123,60,.2);
}

/* EMPTY */
.empty { text-align: center; padding: 72px 24px; max-width: 460px; margin: 0 auto; }
.empty svg { display: block; margin: 0 auto 18px; color: var(--ink4); }
.empty h2 { font-family: var(--ff-disp); font-size: 1.45rem; font-weight: 700; margin-bottom: 10px; color: var(--ink2); }
.empty p { color: var(--ink3); font-size: .9rem; margin-bottom: 20px; line-height: 1.7; }
.empty a { color: var(--gold); text-decoration: underline; }
.empty code { background: var(--code-bg); padding: 1px 5px; border-radius: 3px; font-family: var(--ff-mono); font-size: .8em; color: var(--gold); }
.empty pre { display: inline-block; text-align: left; background: var(--paper2); border: 1px solid var(--border); border-radius: var(--r); padding: 13px 18px; font-family: var(--ff-mono); font-size: .75rem; color: var(--ink3); line-height: 1.8; }

/* NOTE LAYOUT */
.note-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 44px;
  padding-top: 36px;
  align-items: start;
  /* prevent the grid from overflowing viewport */
  min-width: 0;
}
@media (max-width: 760px) { .note-layout { grid-template-columns: 1fr; } .aside { display: none; } }

/* Sidebar: sticky, scrollable, full viewport height minus nav */
.aside {
  position: sticky;
  top: 52px;
  height: calc(100vh - 52px);
  overflow-y: auto;
  overflow-x: hidden;
  padding: 20px 0 40px;
  /* hide scrollbar visually but keep it functional */
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}
.aside::-webkit-scrollbar { width: 4px; }
.aside::-webkit-scrollbar-track { background: transparent; }
.aside::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.back { display: inline-flex; align-items: center; gap: 5px; font-family: var(--ff-mono); font-size: .72rem; color: var(--gold); margin-bottom: 18px; transition: opacity .2s; }
.back:hover { opacity: .7; }

.aside-spine { width: 46px; height: 114px; border-radius: 2px 6px 6px 2px; border-left: 5px solid rgba(0,0,0,.18); display: flex; align-items: center; justify-content: center; margin-bottom: 18px; flex-shrink: 0; }
.aside-spine-text { font-family: var(--ff-disp); font-size: .68rem; font-weight: 700; writing-mode: vertical-rl; transform: rotate(180deg); color: rgba(255,255,255,.88); overflow: hidden; max-height: 96px; text-overflow: ellipsis; white-space: nowrap; }

.aside-block { margin-bottom: 14px; }
.aside-lbl { font-family: var(--ff-mono); font-size: .6rem; text-transform: uppercase; letter-spacing: .14em; color: var(--ink4); margin-bottom: 4px; }
.aside-val { font-size: .8rem; color: var(--ink3); }

#toc a { display: block; font-size: .72rem; color: var(--ink3); padding: 2px 0 2px 9px; border-left: 2px solid var(--border); margin-bottom: 3px; transition: color .14s, border-color .14s; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#toc a:hover, #toc a.active { color: var(--gold); border-left-color: var(--gold); }
#toc a.h3 { padding-left: 18px; font-size: .67rem; }

/* ARTICLE */
.crumb { font-family: var(--ff-mono); font-size: .66rem; color: var(--ink4); margin-bottom: 9px; display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }
.crumb a { color: var(--gold); }
.sep { color: var(--ink4); }
.note-title { font-family: var(--ff-disp); font-size: 2.1rem; font-weight: 700; line-height: 1.2; margin-bottom: 28px; text-transform: capitalize; letter-spacing: -.01em; }

/* MARKDOWN */
.md { max-width: 100%; min-width: 0; overflow-x: hidden; }
.md h1,.md h2,.md h3,.md h4 { font-family: var(--ff-disp); color: var(--ink); line-height: 1.3; margin: 1.8rem 0 .7rem; }
.md h1 { font-size: 1.65rem; border-bottom: 1px solid var(--border); padding-bottom: .45rem; }
.md h2 { font-size: 1.28rem; color: var(--gold); }
.md h3 { font-size: 1.08rem; }
.md p { margin-bottom: .95rem; }
.md a { color: var(--gold); border-bottom: 1px solid var(--border2); transition: border-color .14s; }
.md a:hover { border-bottom-color: var(--gold); }
.md ul,.md ol { margin: .5rem 0 .95rem 1.4rem; }
.md li { margin-bottom: .28rem; }
.md blockquote { border-left: 3px solid var(--gold); padding: .55rem 1.1rem; margin: 1.4rem 0; background: var(--paper2); border-radius: 0 var(--r) var(--r) 0; font-style: italic; font-family: var(--ff-disp); color: var(--ink2); }
.md code { background: var(--code-bg); color: var(--gold); font-family: var(--ff-mono); font-size: .8em; padding: 2px 5px; border-radius: 3px; border: 1px solid var(--border); }
.md pre { background: var(--paper2); border: 1px solid var(--border); border-radius: var(--r); padding: 1.1rem; overflow-x: auto; margin: 1.1rem 0; }
.md pre code { background: none; border: none; padding: 0; color: var(--ink2); font-size: .84em; }
.md table { width: 100%; border-collapse: collapse; font-size: .87rem; margin: 1.4rem 0; }
.md th { background: var(--paper2); border: 1px solid var(--border); padding: 6px 11px; text-align: left; font-family: var(--ff-mono); font-size: .68rem; text-transform: uppercase; letter-spacing: .05em; color: var(--ink3); }
.md td { border: 1px solid var(--border); padding: 6px 11px; color: var(--ink2); }
.md tr:hover td { background: var(--paper2); }
.md img { max-width: 100%; border-radius: var(--r); margin: .9rem 0; border: 1px solid var(--border); }
.md hr { border: none; border-top: 1px solid var(--border); margin: 1.8rem 0; }

/* Article column must not overflow the grid */
article { min-width: 0; overflow-x: hidden; padding-top: 20px; }

/* MOBILE */
@media (max-width: 600px) {
  main { padding: 0 14px 56px; }
  .nav { padding: 0 14px; }
  .lib-header h1 { font-size: 1.9rem; }
  .spine { width: 28px; min-height: 70px; }
  .note-title { font-size: 1.65rem; }
}