@font-face { font-family: 'Fraunces'; font-style: normal; font-weight: 300 600; font-display: swap;   src: url(/fonts/fraunces-latin.woff2) format('woff2'); }
@font-face { font-family: 'Inter'; font-style: normal; font-weight: 300 600; font-display: swap; src: url(/fonts/inter-latin.woff2) format('woff2'); }
@font-face { font-family: 'JetBrains Mono'; font-style: normal; font-weight: 400; font-display: swap; src: url(/fonts/jetbrains-mono-latin-400.woff2) format('woff2'); }
@font-face { font-family: 'JetBrains Mono'; font-style: normal; font-weight: 500; font-display: swap; src: url(/fonts/jetbrains-mono-latin-500.woff2) format('woff2'); }

:root {
  --bg:         oklch(8% 0.002 260);
  --bg-card:    oklch(12% 0.003 260);
  --bg-card-h:  oklch(16% 0.004 260);
  --surface:    oklch(14% 0.003 260);
  --fg:         oklch(96% 0.002 260);
  --fg-bright:  oklch(99% 0 0);
  --muted:      oklch(58% 0.004 260);
  --faint:      oklch(60% 0.003 260);
  --border:     oklch(28% 0.003 260);
  --border-hi:  oklch(50% 0.004 260);
  --accent:     oklch(96% 0.002 260);
  --progress:   oklch(72% 0.08 230);
  --font-display: 'Fraunces', 'Iowan Old Style', Georgia, serif;
  --font-body:    'Inter', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;
  --fs-h1:    clamp(40px, 5.5vw, 64px);
  --fs-h2:    clamp(26px, 3.2vw, 36px);
  --fs-h3:    20px;
  --fs-volume: 1.65rem;
  --fs-lead:  20px;
  --fs-body:  19px;
  --fs-meta:  13px;
  --fs-micro: 12px;
  --fs-small: 0.95rem;
  --gap-xs: 8px;
  --gap-sm: 12px;
  --gap-md: 20px;
  --gap-lg: 32px;
  --gap-xl: 56px;
  --gap-2xl: 96px;
  --measure: 52rem;
  --library: 54rem;
  --gutter: 1.35rem;
  --radius-sm: 8px;
  --radius: 12px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; color-scheme: dark; scrollbar-width: none; }
html::-webkit-scrollbar { display: none; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.7;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
a { color: inherit; }
p { text-wrap: pretty; margin: 0 0 1.4rem; }
h1, h2, h3 { text-wrap: balance; margin: 0; }
img { max-width: 100%; }
:focus-visible { outline: 1px solid var(--border-hi); outline-offset: 3px; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.top {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(12px);
  background: oklch(8% 0.002 260 / 0.75);
  border-bottom: 1px solid var(--border);
}
.top-inner {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0.95rem var(--gutter);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--gap-sm);
}
body.library .top-inner { max-width: var(--library); }
.top a {
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
}
.top a:hover { color: var(--fg-bright); }
.brand {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.02em;
  color: var(--fg-bright) !important;
  text-transform: none;
}

.read-progress {
  display: none;
  height: 2px;
  background: var(--border);
}
body.reader .read-progress { display: block; }
.read-progress-bar {
  height: 100%;
  width: 0%;
  background: var(--progress);
}

.toc-mobile {
  display: none;
  padding: 0 var(--gutter) 0.75rem;
  max-width: var(--measure);
  margin: 0 auto;
}
.toc-mobile select {
  appearance: none;
  width: 100%;
  background: var(--surface);
  color: var(--fg);
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.library-page {
  max-width: var(--library);
  margin: 0 auto;
  padding: 2.25rem var(--gutter) 5rem;
}
.library h1 {
  font-family: var(--font-display);
  font-size: clamp(32px, 4.5vw, 48px);
  line-height: 1;
  letter-spacing: -0.03em;
  font-weight: 400;
  margin: 0;
}

.shelf {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.15rem;
  margin-top: 1.75rem;
  align-items: stretch;
}
.volume {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 0;
  overflow: hidden;
  border-radius: var(--radius);
  transition: border-color 0.15s, background 0.15s;
  height: 100%;
}
.volume:hover {
  border-color: var(--border-hi);
  background: var(--bg-card-h);
}
.volume-cover {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.volume-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.volume-body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 1.15rem 1.2rem 1.2rem;
}
.volume-meta {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.55rem;
}
.volume h2 {
  font-family: var(--font-display);
  font-size: var(--fs-volume);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 400;
  color: var(--fg-bright);
  margin: 0 0 0.4rem;
}
.volume-sub {
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--muted);
  margin: 0;
}
.volume-open {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
  margin-top: auto;
  padding-top: 1.1rem;
}
.volume:hover .volume-open { color: var(--fg-bright); }

.book {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 2.75rem var(--gutter) 4.5rem;
}
.book .loading,
.book .error {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  letter-spacing: 0.04em;
}

.titlepage {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--gap-lg);
  align-items: center;
  margin: 0 0 var(--gap-2xl);
  padding: 0 0 var(--gap-xl);
  border-bottom: 1px solid var(--border);
}
.titlepage-cover {
  margin: 0;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: oklch(10% 0.002 260);
}
.titlepage-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 32% 40%;
  display: block;
}
.titlepage-copy {
  margin: 0;
  padding: 0;
  max-width: none;
  width: auto;
}
.titlepage.no-cover .titlepage-cover { display: none; }
.titlepage .meta {
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.65rem;
}
.titlepage h1 {
  font-family: var(--font-display);
  font-size: var(--fs-h1);
  line-height: 0.95;
  letter-spacing: -0.035em;
  font-weight: 400;
  color: var(--fg-bright);
  margin: 0 0 0.75rem;
}
.titlepage .subtitle {
  font-size: var(--fs-lead);
  line-height: 1.45;
  color: var(--muted);
  margin: 0 0 0.75rem;
}
.titlepage .author {
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
  margin: 0 0 1.5rem;
}
.epigraph {
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2vw, 1.4rem);
  line-height: 1.4;
  color: var(--fg-bright);
  margin: 0 0 0.85rem;
}
.dedication {
  font-size: var(--fs-small);
  line-height: 1.6;
  color: var(--muted);
  margin: 0 0 1.5rem;
}
.titlepage-begin {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--fg-bright);
  border-bottom: 1px solid var(--border-hi);
  padding-bottom: 0.2rem;
}
.titlepage-begin:hover { border-bottom-color: var(--fg-bright); }

@media (min-width: 860px) {
  .titlepage {
    grid-template-columns: 1.05fr 0.95fr;
    gap: var(--gap-xl);
    min-height: calc(100vh - 9rem);
    padding-bottom: var(--gap-lg);
  }
  .titlepage-cover {
    aspect-ratio: 4 / 5;
    max-height: calc(100vh - 10rem);
  }
}

.chapter {
  margin: 0 0 var(--gap-2xl);
  scroll-margin-top: 4.5rem;
}
.chapter h2 {
  font-family: var(--font-display);
  font-size: var(--fs-h2);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 400;
  color: var(--fg-bright);
  margin: 0 0 var(--gap-lg);
}
.chapter p:last-of-type { margin-bottom: 0; }

.chapter-nav {
  display: flex;
  justify-content: space-between;
  gap: var(--gap-md);
  margin-top: var(--gap-xl);
  padding-top: var(--gap-md);
  border-top: 1px solid var(--border);
}
.chapter-nav a {
  text-decoration: none;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--faint);
  max-width: 45%;
  line-height: 1.5;
}
.chapter-nav a:hover { color: var(--fg-bright); }
.chapter-nav .next { margin-left: auto; text-align: right; }

.source {
  margin-top: var(--gap-2xl);
  padding-top: var(--gap-lg);
  border-top: 1px solid var(--border);
  font-size: var(--fs-meta);
  color: var(--muted);
  line-height: 1.65;
}
.source a {
  color: var(--progress);
  text-decoration: none;
  border-bottom: 1px solid oklch(72% 0.08 230 / 0.25);
}
.source a:hover {
  color: var(--fg-bright);
  border-bottom-color: var(--border-hi);
}

.chapter-rail {
  position: fixed;
  top: 50%;
  right: 0;
  transform: translateY(-50%);
  z-index: 90;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.55rem;
  padding-right: 1rem;
}
.chapter-rail a {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--faint);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-direction: row-reverse;
  transition: color 0.2s;
  line-height: 1.4;
}
.chapter-rail a::before {
  content: '';
  width: 10px;
  height: 1px;
  background: var(--faint);
  transition: width 0.2s, background 0.2s;
}
.chapter-rail a:hover { color: var(--fg); }
.chapter-rail a:hover::before,
.chapter-rail a.active::before {
  width: 20px;
  background: var(--fg);
}
.chapter-rail a.active { color: var(--fg); }
.chapter-rail .rail-progress {
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
  overflow: hidden;
}
.chapter-rail .rail-progress-bar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 0;
  background: var(--progress);
}

footer.site {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 var(--gutter) 3rem;
  font-size: 0.9rem;
  color: var(--muted);
}
body.library footer.site { max-width: var(--library); }

@media (max-width: 960px) {
  .chapter-rail { display: none; }
  body.reader .toc-mobile { display: block; }
}

  @media (max-width: 640px) {
  body { font-size: 18px; }
  .shelf { grid-template-columns: 1fr; }
  .titlepage { min-height: 0; gap: var(--gap-md); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .volume,
  .chapter-rail a,
  .chapter-rail a::before { transition: none; }
}