/* ============================================================
   Nietzsche Reading Guide — design system
   Spare / modernist: restrained palette, generous whitespace,
   serif-tinged sans-serif typography, narrow reading column.
   ============================================================ */

:root {
  --bg: #eef1f4;           /* cool fog-white */
  --bg-rule: #d2d8df;      /* cool hairline */
  --fg: #1a1f26;           /* cool near-black */
  --fg-muted: #5e6770;     /* fog-rock gray */
  --fg-faint: #98a0a9;     /* faint cool gray */
  --accent: #2c3e54;       /* twilight slate, after Friedrich */
  --accent-soft: #6e7d90;  /* mist-mountain blue */
  --max: 660px;
  --max-wide: 920px;
  --sans: "Inter", "Helvetica Neue", system-ui, -apple-system, "Segoe UI", sans-serif;
  --serif: "Source Serif Pro", "Iowan Old Style", "Palatino", "Georgia", serif;
  --mono: "JetBrains Mono", "SF Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  padding: 3.5rem 1.5rem 6rem;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 120ms ease, color 120ms ease;
}
a:hover {
  border-bottom-color: var(--accent);
}

/* ---- Layout ---- */

.wrap {
  max-width: var(--max);
  margin: 0 auto;
}
.wrap-wide {
  max-width: var(--max-wide);
  margin: 0 auto;
}

.site-head {
  max-width: var(--max-wide);
  margin: 0 auto 4rem;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 2rem;
  border-bottom: 1px solid var(--bg-rule);
  padding-bottom: 1rem;
}
.site-title {
  font-family: var(--serif);
  font-weight: 400;
  font-style: italic;
  font-size: 1.5rem;
  letter-spacing: 0.01em;
  color: var(--fg);
  border: none;
}
.site-title:hover { border: none; color: var(--accent); }
.site-nav {
  display: flex;
  gap: 1.6rem;
  font-size: 0.92rem;
}
.site-nav a {
  color: var(--fg-muted);
  border: none;
}
.site-nav a:hover, .site-nav a.is-current {
  color: var(--accent);
}

/* ---- Headings ---- */

h1, h2, h3, h4 {
  font-family: var(--sans);
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--fg);
  line-height: 1.25;
}
h1 {
  font-size: 2.1rem;
  margin: 0 0 0.5rem;
  font-weight: 400;
}
h1.serif {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 2.4rem;
  letter-spacing: -0.015em;
}
h2 {
  font-size: 1.18rem;
  margin: 3rem 0 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-muted);
}
h3 {
  font-size: 1.05rem;
  margin: 2rem 0 0.4rem;
  font-weight: 500;
}

p {
  margin: 0 0 1.1rem;
}

em, i, cite {
  font-family: var(--serif);
  font-style: italic;
}

.dek {
  font-family: var(--serif);
  font-style: italic;
  color: var(--fg-muted);
  font-size: 1.05rem;
  margin: 0 0 2.5rem;
}

.eyebrow {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--fg-faint);
  margin: 0 0 1.2rem;
}

.rule {
  height: 1px;
  background: var(--bg-rule);
  border: none;
  margin: 3rem 0;
}

/* ---- Index lists ---- */

.theme-index {
  list-style: none;
  padding: 0;
  margin: 0;
}
.theme-index li {
  border-top: 1px solid var(--bg-rule);
  padding: 1rem 0;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  align-items: baseline;
}
.theme-index li:last-child { border-bottom: 1px solid var(--bg-rule); }
.theme-index a {
  font-family: var(--serif);
  font-size: 1.15rem;
  color: var(--fg);
  border: none;
}
.theme-index a:hover { color: var(--accent); }
.theme-index .gloss {
  font-family: var(--sans);
  font-size: 0.92rem;
  color: var(--fg-muted);
  font-style: normal;
}
.theme-index .period-tag {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--fg-faint);
  white-space: nowrap;
}

.cluster {
  margin-bottom: 3rem;
}
.cluster h2 {
  margin-top: 0;
}
.cluster .cluster-note {
  font-family: var(--serif);
  font-style: italic;
  color: var(--fg-muted);
  font-size: 0.98rem;
  margin: -0.2rem 0 1.2rem;
}

/* ---- Filter bar ---- */

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0 0 2.5rem;
  font-size: 0.85rem;
}
.filter-bar .label {
  color: var(--fg-faint);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.72rem;
  margin-right: 0.6rem;
  align-self: center;
}
.filter-bar button {
  background: transparent;
  border: 1px solid var(--bg-rule);
  color: var(--fg-muted);
  padding: 0.3rem 0.75rem;
  font-family: var(--sans);
  font-size: 0.85rem;
  cursor: pointer;
  border-radius: 999px;
  transition: all 120ms ease;
}
.filter-bar button:hover {
  border-color: var(--accent-soft);
  color: var(--fg);
}
.filter-bar button.is-active {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
}

/* ---- Theme pages ---- */

.passage-list {
  list-style: none;
  padding: 0;
  margin: 0 0 2rem;
  counter-reset: passage;
}
.passage-list li {
  counter-increment: passage;
  padding: 1rem 0 1.1rem 2.6rem;
  border-top: 1px solid var(--bg-rule);
  position: relative;
}
.passage-list li:last-child {
  border-bottom: 1px solid var(--bg-rule);
}
.passage-list li::before {
  content: counter(passage, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1.05rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--fg-faint);
  letter-spacing: 0.04em;
}
.passage-list .citation {
  font-family: var(--serif);
  font-size: 1.02rem;
  display: block;
  margin-bottom: 0.25rem;
}
.passage-list .citation .title {
  font-style: italic;
}
.passage-list .citation a.title {
  color: var(--fg);
  border-bottom: 1px solid transparent;
  transition: border-color 120ms ease, color 120ms ease;
}
.passage-list .citation a.title:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.passage-list .citation .ref {
  color: var(--fg-muted);
  font-style: normal;
}
.passage-list .gloss {
  font-size: 0.95rem;
  color: var(--fg-muted);
  margin: 0;
}

.framing {
  font-family: var(--serif);
  font-size: 1.18rem;
  line-height: 1.55;
  color: var(--fg);
  border-left: 2px solid var(--accent-soft);
  padding: 0.2rem 0 0.2rem 1.1rem;
  margin: 0 0 2.5rem;
  font-style: italic;
}

.connections {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.4rem;
}

/* ---- Across-the-corpus blocks (theme pages) ---- */

.book-head {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.2rem;
  letter-spacing: 0;
  text-transform: none;
  color: var(--fg);
  margin: 2.6rem 0 0.4rem;
}
.book-head a.title {
  font-style: italic;
  color: var(--fg);
  border: none;
}
.book-head a.title:hover {
  color: var(--accent);
}

.corpus-bullets {
  list-style: none;
  padding: 0;
  margin: 0.6rem 0 1.6rem;
}
.corpus-bullets li {
  border-top: 1px solid var(--bg-rule);
  padding: 0.65rem 0;
  font-size: 0.94rem;
  line-height: 1.55;
  color: var(--fg-muted);
}
.corpus-bullets li:last-child {
  border-bottom: 1px solid var(--bg-rule);
}
.corpus-bullets .ref {
  font-family: var(--serif);
  color: var(--fg);
  font-style: normal;
  margin-right: 0.35rem;
}
.corpus-bullets .passage-title {
  font-family: var(--serif);
  font-style: italic;
  color: var(--fg);
}
/* ---- Submissions (reader essays) ---- */

/* Link list on theme pages */
.submission-list {
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem;
}
.submission-list li {
  border-top: 1px solid var(--bg-rule);
  padding: 1rem 0;
}
.submission-list li:last-child {
  border-bottom: 1px solid var(--bg-rule);
}
.submission-list a {
  font-family: var(--serif);
  font-size: 1.15rem;
  color: var(--fg);
  border: none;
  display: block;
  margin-bottom: 0.15rem;
}
.submission-list a:hover {
  color: var(--accent);
}
.submission-list .gloss {
  font-family: var(--sans);
  font-size: 0.92rem;
  color: var(--fg-muted);
  display: block;
}

/* Standalone submission essay pages */
.submission {
  margin: 1rem 0 3rem;
}
.submission-title {
  font-family: var(--serif);
  font-weight: 400;
  font-style: italic;
  font-size: 1.5rem;
  letter-spacing: -0.005em;
  line-height: 1.25;
  color: var(--fg);
  margin: 0.4rem 0 1.6rem;
  text-transform: none;
}
.submission-title--page {
  font-size: 2.2rem;
  line-height: 1.18;
  margin: 0 0 2rem;
  letter-spacing: -0.015em;
}
.submission p {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--fg);
  margin: 0 0 1.2rem;
}
.submission-section {
  font-family: var(--sans);
  font-weight: 500;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin: 2.4rem 0 1rem;
  line-height: 1.3;
}
.submission-part-head {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.55rem;
  letter-spacing: -0.005em;
  line-height: 1.25;
  color: var(--fg);
  margin: 3.5rem 0 1.2rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--bg-rule);
  text-transform: none;
}
.submission-passage-head {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.18rem;
  letter-spacing: 0;
  line-height: 1.3;
  color: var(--fg);
  margin: 2.4rem 0 0.55rem;
  text-transform: none;
}
.submission-subpassage-head {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1rem;
  color: var(--fg-muted);
  margin: 1.6rem 0 0.4rem;
  text-transform: none;
}
.submission-framing {
  font-family: var(--serif);
  font-style: italic;
  color: var(--fg-muted);
  font-size: 0.98rem;
  line-height: 1.6;
  margin: 0 0 1.2rem;
  border-left: 2px solid var(--bg-rule);
  padding-left: 1rem;
}
.submission-framing em {
  font-style: italic;
}
.submission-index-list {
  list-style: none;
  padding: 0;
  margin: 0.4rem 0 1.2rem;
}
.submission-index-list li {
  border-top: 1px solid var(--bg-rule);
  padding: 0.55rem 0;
  font-size: 0.94rem;
  line-height: 1.55;
  color: var(--fg-muted);
}
.submission-index-list li:last-child {
  border-bottom: 1px solid var(--bg-rule);
}
.submission-index-list strong {
  font-family: var(--serif);
  font-weight: 400;
  color: var(--fg);
}

.connections li {
  font-size: 0.95rem;
}
.connections a { font-family: var(--serif); font-size: 1.02rem; }
.connections .why {
  color: var(--fg-muted);
  font-size: 0.92rem;
  display: block;
  margin-top: 0.1rem;
}

.meta-row {
  display: flex;
  gap: 1.4rem;
  font-size: 0.78rem;
  color: var(--fg-faint);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin: 0 0 2rem;
}
.meta-row .item strong {
  color: var(--fg-muted);
  font-weight: 500;
}

.crumb {
  font-size: 0.82rem;
  color: var(--fg-faint);
  margin: 0 0 1rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
.crumb a { color: var(--fg-muted); border: none; }
.crumb a:hover { color: var(--accent); }

.sequence-note {
  font-family: var(--serif);
  font-style: italic;
  color: var(--fg-muted);
  margin: 0 0 1.6rem;
}

.footer-nav {
  margin-top: 4.5rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--bg-rule);
  display: flex;
  justify-content: space-between;
  font-size: 0.88rem;
}
.footer-nav a { color: var(--fg-muted); border: none; }
.footer-nav a:hover { color: var(--accent); }

/* ---- Corpus page ---- */

.corpus {
  list-style: none;
  padding: 0;
  margin: 0;
}
.corpus > li {
  border-top: 1px solid var(--bg-rule);
  padding: 1.2rem 0;
  display: grid;
  grid-template-columns: 5rem 1fr;
  gap: 1.2rem;
}
.corpus > li:last-child { border-bottom: 1px solid var(--bg-rule); }
.corpus .year {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--fg-faint);
  padding-top: 0.15rem;
}
.corpus .title {
  font-family: var(--serif);
  font-size: 1.18rem;
  font-style: italic;
  margin: 0 0 0.25rem;
}
.corpus .gloss {
  font-size: 0.95rem;
  color: var(--fg-muted);
  margin: 0 0 0.4rem;
}
.corpus .anchors {
  font-size: 0.85rem;
  color: var(--fg-muted);
}
.corpus .anchors a { color: var(--fg); }
.corpus .anchors a:hover { color: var(--accent); }

.period-band {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--fg-faint);
  margin: 2.5rem 0 0.4rem;
  border-bottom: 1px solid var(--bg-rule);
  padding-bottom: 0.4rem;
}
.period-band:first-of-type { margin-top: 1rem; }

/* ---- Hero (home) ---- */

.hero {
  padding-top: 1rem;
}
.hero .glyph {
  font-family: var(--serif);
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin-bottom: 1.4rem;
}
.hero h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 1.4rem;
}
.hero .lede {
  font-family: var(--serif);
  font-size: 1.25rem;
  line-height: 1.5;
  color: var(--fg);
  margin-bottom: 2.5rem;
  max-width: 36rem;
}

.entrances {
  display: grid;
  gap: 1.1rem;
  margin: 2rem 0 0;
  list-style: none;
  padding: 0;
}
.entrances li {
  border-top: 1px solid var(--bg-rule);
  padding: 1rem 0;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  align-items: baseline;
}
.entrances li:last-child { border-bottom: 1px solid var(--bg-rule); }
.entrances a {
  font-family: var(--serif);
  font-size: 1.25rem;
  color: var(--fg);
  border: none;
}
.entrances a:hover { color: var(--accent); }
.entrances .gloss { color: var(--fg-muted); font-size: 0.92rem; max-width: 26rem; }
.entrances .arrow { color: var(--fg-faint); font-family: var(--mono); }

/* ---- Quote / pull ---- */

blockquote {
  margin: 2.5rem 0;
  padding: 0 0 0 1.2rem;
  border-left: 2px solid var(--accent-soft);
  font-family: var(--serif);
  font-style: italic;
  color: var(--fg);
  font-size: 1.08rem;
}
blockquote cite {
  display: block;
  font-size: 0.85rem;
  color: var(--fg-muted);
  font-style: normal;
  margin-top: 0.6rem;
}

/* ---- Glossary ---- */

.glossary {
  margin: 0 0 3rem;
}
.glossary dt {
  font-family: var(--serif);
  font-size: 1.1rem;
  font-weight: 400;
  font-style: italic;
  color: var(--fg);
  margin: 1.6rem 0 0.3rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--bg-rule);
}
.glossary dt:first-child {
  border-top: none;
  padding-top: 0;
  margin-top: 0;
}
.glossary dd {
  margin: 0 0 0.4rem;
  font-size: 0.98rem;
  line-height: 1.6;
  color: var(--fg);
}
.glossary dd a {
  font-size: 0.88rem;
  color: var(--fg-muted);
  border: none;
  margin-left: 0.3rem;
}
.glossary dd a:hover {
  color: var(--accent);
}

/* ---- Footer ---- */

.site-foot {
  max-width: var(--max-wide);
  margin: 6rem auto 0;
  padding-top: 1.4rem;
  border-top: 1px solid var(--bg-rule);
  font-size: 0.82rem;
  color: var(--fg-faint);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.site-foot em { font-family: var(--serif); }

/* ---- Responsive ---- */

@media (max-width: 640px) {
  body { padding: 2rem 1.1rem 4rem; font-size: 16px; }
  .site-head { flex-direction: column; gap: 0.7rem; align-items: flex-start; margin-bottom: 2.5rem; }
  .site-nav { gap: 1.1rem; }
  .theme-index li, .entrances li { grid-template-columns: 1fr; }
  .theme-index .period-tag { display: none; }
  .corpus > li { grid-template-columns: 1fr; gap: 0.3rem; }
  .corpus .year { font-size: 0.78rem; }
}