/* ===========================================================================
   Latent Shelf — shared stylesheet (home + book pages)
   Chapter pages carry their own inline styles but share these design tokens.
   =========================================================================== */

:root{
  --ground:#F4F5F7; --surface:#FFFFFF; --surface-2:#FBFBFC;
  --ink:#181B22; --muted:#59606E; --faint:#8A909C;
  --accent:#A9640F; --accent-bright:#C67C1C; --accent-soft:#F3E7D4;
  --line:#E3E6EB; --line-strong:#D3D8E0;
  --good:#2E7350; --crit:#AA3A2B;
  --display:"Archivo",system-ui,sans-serif;
  --body:"Hanken Grotesk",system-ui,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,"SFMono-Regular",monospace;
  --measure:66ch;
  --shadow:0 1px 2px rgba(20,24,34,.04),0 8px 24px rgba(20,24,34,.05);
  --radius:14px;
}
:root:not([data-theme="light"]){
  @media (prefers-color-scheme:dark){
    --ground:#101218; --surface:#1A1D24; --surface-2:#20242C;
    --ink:#E9EBEF; --muted:#99A0AD; --faint:#6B7280;
    --accent:#E0A34C; --accent-bright:#EDB767; --accent-soft:#2E2418;
    --line:#282D37; --line-strong:#343A46;
    --good:#5FB98A; --crit:#E08072;
    --shadow:0 1px 2px rgba(0,0,0,.3),0 10px 30px rgba(0,0,0,.35);
  }
}
:root[data-theme="dark"]{
  --ground:#101218; --surface:#1A1D24; --surface-2:#20242C;
  --ink:#E9EBEF; --muted:#99A0AD; --faint:#6B7280;
  --accent:#E0A34C; --accent-bright:#EDB767; --accent-soft:#2E2418;
  --line:#282D37; --line-strong:#343A46;
  --good:#5FB98A; --crit:#E08072;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 10px 30px rgba(0,0,0,.35);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto} *{animation:none!important;transition:none!important}}
body{margin:0;background:var(--ground);color:var(--ink);font-family:var(--body);font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
.wrap{max-width:920px;margin:0 auto;padding:0 24px}
a{color:inherit;text-decoration:none}
::selection{background:var(--accent);color:#fff}
img{max-width:100%}

/* ---------- top nav ---------- */
.nav{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--ground) 88%,transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav-in{max-width:920px;margin:0 auto;padding:12px 24px;display:flex;align-items:center;gap:12px}
.brand{display:flex;align-items:center;gap:9px;font-family:var(--display);font-weight:800;font-size:1.02rem;letter-spacing:-.01em;color:var(--ink)}
.brand .mark{width:22px;height:22px;border-radius:6px;background:var(--accent);display:inline-flex;align-items:center;justify-content:center;color:#fff;font-size:13px;flex:none}
.crumbs{font-family:var(--mono);font-size:11.5px;color:var(--faint);letter-spacing:.02em;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;border-left:1px solid var(--line-strong);padding-left:12px}
.crumbs a:hover{color:var(--accent)}
.nav .toggle{margin-left:auto;flex:none;background:var(--surface);border:1px solid var(--line-strong);color:var(--muted);font-family:var(--mono);font-size:11px;font-weight:500;letter-spacing:.06em;text-transform:uppercase;padding:7px 12px;border-radius:7px;cursor:pointer;transition:border-color .15s,color .15s}
.nav .toggle:hover{border-color:var(--accent);color:var(--accent)}
.nav .toggle:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* ---------- home hero ---------- */
.home-hero{padding:72px 0 34px}
.eyebrow{font-family:var(--mono);font-size:12.5px;font-weight:500;letter-spacing:.16em;text-transform:uppercase;color:var(--accent);margin:0 0 20px}
.home-hero h1{font-family:var(--display);font-weight:800;font-size:clamp(2.4rem,7vw,4rem);line-height:1.02;letter-spacing:-.025em;text-wrap:balance;margin:0 0 22px;max-width:16ch}
.home-hero p.lede{font-size:1.2rem;line-height:1.55;color:var(--muted);max-width:var(--measure);margin:0}
.home-hero .count{font-family:var(--mono);font-size:12px;color:var(--faint);margin-top:26px;letter-spacing:.03em}

/* ---------- section heading ---------- */
.shelf-head{display:flex;align-items:baseline;gap:12px;margin:14px 0 22px;padding-top:30px;border-top:1px solid var(--line)}
.shelf-head h2{font-family:var(--display);font-weight:700;font-size:1.5rem;letter-spacing:-.01em;margin:0}
.shelf-head .n{font-family:var(--mono);font-size:12px;color:var(--faint);margin-left:auto}

/* ---------- book grid ---------- */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:18px;padding-bottom:60px}
.book-card{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:transform .16s ease,border-color .16s ease,box-shadow .16s ease}
.book-card:hover{transform:translateY(-3px);border-color:var(--accent);box-shadow:0 10px 34px rgba(20,24,34,.12)}
.book-cover{aspect-ratio:16/7;background:linear-gradient(135deg,var(--accent) 0%,var(--accent-bright) 100%);display:flex;align-items:center;justify-content:center;position:relative}
.book-cover .em{font-size:2.6rem;filter:drop-shadow(0 2px 6px rgba(0,0,0,.2))}
.book-cover .ct{position:absolute;top:11px;right:12px;font-family:var(--mono);font-size:10.5px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:#fff;background:rgba(0,0,0,.22);border-radius:20px;padding:4px 10px}
.book-card .body{padding:18px 20px 20px;display:flex;flex-direction:column;flex:1}
.book-card h3{font-family:var(--display);font-weight:700;font-size:1.18rem;line-height:1.2;letter-spacing:-.01em;margin:0 0 8px;text-wrap:balance}
.book-card .desc{font-size:.94rem;color:var(--muted);margin:0 0 16px;flex:1}
.book-card .foot{display:flex;align-items:center;justify-content:space-between;gap:10px;font-family:var(--mono);font-size:11.5px;color:var(--faint)}
.book-card .go{color:var(--accent);font-weight:600}

/* ---------- book page ---------- */
.book-header{padding:44px 0 6px;display:grid;grid-template-columns:120px 1fr;gap:26px;align-items:start}
@media (max-width:560px){.book-header{grid-template-columns:1fr;gap:18px}}
.book-badge{aspect-ratio:3/4;border-radius:12px;background:linear-gradient(150deg,var(--accent) 0%,var(--accent-bright) 100%);display:flex;align-items:center;justify-content:center;font-size:3rem;box-shadow:var(--shadow)}
.book-header .meta .eyebrow{margin-bottom:14px}
.book-header h1{font-family:var(--display);font-weight:800;font-size:clamp(1.9rem,4.6vw,2.7rem);line-height:1.05;letter-spacing:-.02em;text-wrap:balance;margin:0 0 12px}
.book-header .subtitle{font-size:1.1rem;color:var(--muted);margin:0;max-width:var(--measure)}

.prose{padding:24px 0 8px}
.prose p{max-width:var(--measure);margin:0 0 16px;color:var(--ink)}

/* credit box */
.credit{background:var(--surface);border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:12px;padding:20px 22px;margin:14px 0 8px;box-shadow:var(--shadow)}
.credit .label{font-family:var(--mono);font-size:10.5px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);margin:0 0 12px}
.credit .who{font-family:var(--display);font-weight:700;font-size:1.15rem;margin:0 0 4px}
.credit .role{font-size:.92rem;color:var(--muted);margin:0 0 14px;max-width:60ch}
.credit dl{display:grid;grid-template-columns:auto 1fr;gap:6px 16px;margin:0;font-size:.9rem}
.credit dt{font-family:var(--mono);font-size:11px;letter-spacing:.04em;text-transform:uppercase;color:var(--faint);align-self:baseline}
.credit dd{margin:0;color:var(--ink)}
.credit dd a{color:var(--accent);text-decoration:underline;text-underline-offset:2px}
.credit .fine{margin:14px 0 0;font-size:.82rem;color:var(--faint);line-height:1.5;max-width:64ch}

/* chapter list */
.ch-head{display:flex;align-items:baseline;gap:12px;margin:38px 0 18px;padding-top:28px;border-top:1px solid var(--line)}
.ch-head h2{font-family:var(--display);font-weight:700;font-size:1.35rem;letter-spacing:-.01em;margin:0}
.ch-head .n{font-family:var(--mono);font-size:12px;color:var(--faint);margin-left:auto}
.ch-list{display:flex;flex-direction:column;gap:12px;padding-bottom:64px}
.ch-item{display:grid;grid-template-columns:auto 1fr auto;gap:18px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:18px 20px;transition:border-color .15s ease,transform .15s ease}
.ch-item:hover{border-color:var(--accent);transform:translateX(2px)}
.ch-num{font-family:var(--mono);font-weight:600;font-size:13px;color:var(--surface);background:var(--accent);border-radius:8px;width:38px;height:38px;display:flex;align-items:center;justify-content:center;flex:none}
.ch-item h3{font-family:var(--display);font-weight:600;font-size:1.1rem;letter-spacing:-.01em;margin:0 0 4px}
.ch-item .blurb{font-size:.9rem;color:var(--muted);margin:0}
.ch-item .aside{display:flex;flex-direction:column;align-items:flex-end;gap:5px;flex:none;font-family:var(--mono);font-size:10.5px;color:var(--faint);text-align:right}
.ch-item .quizpill{background:var(--accent-soft);color:var(--accent);font-weight:600;border-radius:20px;padding:3px 9px;letter-spacing:.02em}
.ch-item .arrow{color:var(--accent);font-size:16px;font-weight:700}
@media (max-width:560px){.ch-item{grid-template-columns:auto 1fr}.ch-item .aside{display:none}}

/* ---------- footer ---------- */
.foot-wrap{border-top:1px solid var(--line);padding:30px 0 60px;color:var(--faint);font-family:var(--mono);font-size:12px;line-height:1.7}
.foot-wrap b{color:var(--muted);font-weight:600}
.foot-wrap a{color:var(--accent)}