/* ==========================================================================
   Negentropia — Quiet Editorial Monochrome Stylesheet
   100% Pure Monochrome (#0c0c0b, #e6e4dd, #b8b5ac, #78756e)
   ========================================================================== */

:root {
  --bg: #0c0c0b;
  --surface: #121210;
  --ink: #e6e4dd;
  --body: #b8b5ac;
  --muted: #78756e;
  --rule: rgba(230, 228, 221, 0.12);
  --rule-strong: rgba(230, 228, 221, 0.32);

  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, monospace;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  background-color: var(--bg);
  color: var(--ink);
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--sans);
  font-weight: 400;
  line-height: 1.7;
  color: var(--body);
  background-color: var(--bg);
  min-height: 100vh;
}

::selection {
  background: var(--ink);
  color: var(--bg);
}

a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--rule-strong);
  text-underline-offset: 3px;
  transition: text-decoration-color 0.2s ease, color 0.2s ease;
}

a:hover {
  text-decoration-color: var(--ink);
}

.mono {
  font-family: var(--mono);
  font-size: 0.8125rem;
  letter-spacing: 0.01em;
}

.muted {
  color: var(--muted);
}

/* ---------- MASTHEAD ---------- */
.masthead {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(12, 12, 11, 0.88);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}

.masthead-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 1rem clamp(1.25rem, 4vw, 3rem);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
}

.masthead-mark {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  color: var(--ink);
  text-decoration: none;
  opacity: 0.95;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.masthead-mark:hover {
  opacity: 1;
  transform: scale(1.04);
}

.brand-glyph {
  display: block;
  filter: drop-shadow(0 0 4px rgba(230, 228, 221, 0.2));
}

.masthead-center {
  justify-self: center;
  text-decoration: none;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
}

.wordmark-title {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: 0.01em;
  line-height: 1.1;
}

.wordmark-sub {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  color: var(--muted);
  line-height: 1;
}

.masthead-meta {
  justify-self: end;
  display: flex;
  align-items: center;
}

.formula-badge {
  display: inline-flex;
  align-items: center;
  justify-content: flex-end;
  line-height: 1;
  user-select: none;
  opacity: 0.85;
  transition: opacity 0.2s ease;
}

.formula-badge:hover {
  opacity: 1;
}

.badge-math {
  font-family: var(--serif);
  font-size: 1.1rem;
  letter-spacing: 0.04em;
  color: var(--ink);
}

.badge-math em {
  font-style: italic;
  font-family: var(--serif);
  margin-right: 0.12em;
}

/* ---------- MONOGRAPH LAYOUT ---------- */
.monograph {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 4vw, 3rem);
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 4.5rem);
}

/* ---------- LEFT STICKY INDEX ---------- */
.index-col {
  border-right: 1px solid var(--rule);
  padding: 3.5rem 1.5rem 3.5rem 0;
}

.index-sticky {
  position: sticky;
  top: 5.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.index-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.index-nav {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.index-link {
  text-decoration: none;
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  font-size: 0.88rem;
  color: var(--muted);
  transition: color 0.2s ease;
}

.index-link .sec-num {
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.92rem;
  min-width: 1.6rem;
}

.index-link:hover,
.index-link.active {
  color: var(--ink);
}

.index-colophon {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  font-size: 0.76rem;
  color: var(--muted);
  line-height: 1.6;
}

/* ---------- MAIN READING COLUMN ---------- */
.reading-col {
  padding: 3.5rem 0 5rem;
}

/* ---------- PREAMBLE ---------- */
.preamble {
  padding-bottom: 4.5rem;
  border-bottom: 1px solid var(--rule);
}

.kicker {
  font-family: var(--mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 1.25rem;
}

h1 {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(2.1rem, 4vw, 3.35rem);
  line-height: 1.14;
  color: var(--ink);
  letter-spacing: -0.015em;
  margin-bottom: 1.75rem;
}

h1 em {
  font-style: italic;
  font-weight: 300;
}

.opening {
  font-size: 1.06rem;
  line-height: 1.75;
  color: var(--body);
  max-width: 64ch;
}

.opening strong {
  color: var(--ink);
  font-weight: 500;
}

/* ---------- CHAPTER SECTIONS ---------- */
.chapter {
  padding: 4.25rem 0;
  border-bottom: 1px solid var(--rule);
}

.chapter-head {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  margin-bottom: 2rem;
}

.chapter-head .sec-num {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.35rem;
  color: var(--muted);
}

h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  color: var(--ink);
  letter-spacing: -0.01em;
}

.prose-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(200px, 0.65fr);
  gap: clamp(1.75rem, 4vw, 3.5rem);
  align-items: start;
}

.prose p {
  margin-bottom: 1.4rem;
  font-size: 1.01rem;
  max-width: 64ch;
}

.prose strong {
  color: var(--ink);
  font-weight: 500;
}

.prose em {
  font-family: var(--serif);
  font-size: 1.06em;
  color: var(--ink);
}

sup {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--ink);
  margin-left: 0.1rem;
}

.epigraph {
  margin: 2rem 0 0.5rem;
  padding: 1.25rem 0 1.25rem 1.5rem;
  border-left: 1px solid var(--rule-strong);
}

.epigraph p {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.25rem;
  line-height: 1.5;
  color: var(--ink);
  margin-bottom: 0;
}

/* Sidenotes */
.sidenotes {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  padding-top: 0.25rem;
  border-left: 1px solid var(--rule);
  padding-left: 1.25rem;
}

.sidenote {
  font-size: 0.8rem;
  line-height: 1.55;
  color: var(--muted);
}

.sn-num {
  font-family: var(--mono);
  color: var(--ink);
  display: block;
  margin-bottom: 0.25rem;
  font-size: 0.74rem;
}

.channel-list {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  margin-top: 0.4rem;
}

/* ---------- COMPARISON TABLE (§2) ---------- */
.comparison {
  margin-top: 2.25rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
}

.comp-col {
  padding: 1.5rem 1.5rem 1.5rem 0;
}

.comp-col.active-col {
  padding-left: 1.5rem;
  padding-right: 0;
  border-left: 1px solid var(--rule);
  color: var(--ink);
}

.comp-title {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  font-family: var(--serif);
  font-size: 1.1rem;
  color: var(--ink);
  margin-bottom: 1rem;
}

.comp-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  font-size: 0.9rem;
}

.comp-col:not(.active-col) ul {
  color: var(--muted);
}

.comp-col li {
  padding-top: 0.6rem;
  border-top: 1px solid var(--rule);
}

/* ---------- LEDGER TABLE (§3) ---------- */
.ledger-intro {
  max-width: 64ch;
  margin-bottom: 2rem;
}

.ledger {
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
}

.ledger-row {
  display: grid;
  grid-template-columns: 60px minmax(180px, 1.2fr) minmax(200px, 1.5fr) 130px;
  gap: 1.25rem;
  padding: 1rem 0;
  border-top: 1px solid var(--rule);
  align-items: baseline;
  font-size: 0.92rem;
}

.ledger-row:first-child {
  border-top: none;
}

.ledger-header {
  font-family: var(--mono);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  padding: 0.75rem 0;
}

.ledger-title {
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.05rem;
}

/* ---------- CONTACT CARD (§4) ---------- */
.contact-card {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.95fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
  border-top: 1px solid var(--rule-strong);
  padding-top: 2rem;
}

.contact-lead {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--ink);
  margin-bottom: 0.85rem;
}

.contact-desc {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--body);
  margin-bottom: 1.75rem;
  max-width: 52ch;
}

.join-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
}

.direct-contact {
  font-size: 0.78rem;
  color: var(--muted);
}

.direct-contact a {
  color: var(--body);
}

/* Directory / Fihrist */
.contact-directory {
  background: var(--surface);
  border: 1px solid var(--rule);
  padding: 1.5rem 1.75rem;
}

.directory-title {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 0.5rem;
}

.directory-list {
  list-style: none;
  display: flex;
  flex-direction: column;
}

.directory-list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--rule);
  font-size: 0.86rem;
  gap: 1rem;
}

.directory-list li:last-child {
  border-bottom: none;
}

.dir-label {
  font-size: 0.76rem;
  color: var(--muted);
  flex-shrink: 0;
}

.dir-link {
  color: var(--ink);
  text-align: right;
  word-break: break-all;
  text-decoration-color: var(--rule-strong);
}

.dir-link:hover {
  text-decoration-color: var(--ink);
}

.submit-btn {
  display: inline-flex;
  align-items: center;
  background: var(--ink);
  color: var(--bg);
  border: 1px solid var(--ink);
  padding: 0.75rem 1.45rem;
  font-family: var(--sans);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}

.submit-btn:hover {
  background: transparent;
  color: var(--ink);
}

/* ---------- COLOPHON / FOOTER ---------- */
.colophon {
  padding-top: 3rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  font-size: 0.85rem;
}

.colophon-left {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.colophon-left strong {
  color: var(--ink);
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.05rem;
}

.colophon-right {
  display: flex;
  gap: 0.6rem;
  color: var(--muted);
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 960px) {
  .monograph {
    grid-template-columns: 1fr;
  }

  .index-col {
    border-right: none;
    border-bottom: 1px solid var(--rule);
    padding: 1.25rem 0;
  }

  .index-sticky {
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
  }

  .index-label,
  .index-colophon {
    display: none;
  }

  .index-nav {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 1.25rem;
  }

  .prose-grid {
    grid-template-columns: 1fr;
  }

  .contact-card {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 640px) {
  .wordmark-title {
    font-size: 1rem;
  }

  .contact-card {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .comparison {
    grid-template-columns: 1fr;
  }

  .comp-col.active-col {
    padding-left: 0;
    border-left: none;
    border-top: 1px solid var(--rule-strong);
  }

  .ledger-header {
    display: none;
  }

  .ledger-row {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }

  .field-row {
    grid-template-columns: 1fr;
    gap: 0.4rem;
  }
}