/* ==========================================================
   PROOF — Main Stylesheet
   Design system: "The Purity of the Word"
   Fonts: Newsreader (content) + Inter (UI)
   ========================================================== */

/* --- Custom Properties (Design Tokens) --- */
:root {
  /* Colors — Ink on Paper Monochrome */
  --color-bg: #fbf9f4;
  --color-ink: #000000;
  --color-body: #1b1c19;
  --color-surface-low: #f5f3ee;
  --color-surface-high: #eae8e3;
  --color-outline-variant: #c6c6c6;

  /* Typography */
  --font-headline: 'Newsreader', serif;
  --font-body: 'Newsreader', serif;
  --font-label: 'Inter', sans-serif;

  /* Type scale */
  --text-display: 3.5rem;
  --text-headline: 1.75rem;
  --text-body-lg: 1.15rem;
  --text-body: 1rem;
  --text-body-essay: 1.125rem;
  --text-label-md: 0.75rem;
  --text-label-sm: 0.68rem;

  /* Tracking */
  --tracking-display: -0.02em;
  --tracking-headline: -0.01em;
  --tracking-nav: 0.05rem;
  --tracking-label-md: 0.12em;
  --tracking-label-sm: 0.15em;

  /* Layout */
  --max-content: 80rem;
  --max-prose: 55ch;
  --header-height: 72px;
}


/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.8;
}

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

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

ul, ol {
  list-style: none;
}

/* Scrollbar */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--color-bg); }
::-webkit-scrollbar-thumb { background: var(--color-outline-variant); }


/* --- Site Header --- */
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  width: 100%;
  padding: 1.5rem 2rem;
  background-color: var(--color-bg);
}

.site-title {
  font-family: var(--font-headline);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--color-ink);
}

.site-nav {
  display: flex;
  gap: 3rem;
}

.nav-link {
  font-family: var(--font-label);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: var(--tracking-nav);
  color: rgba(27, 28, 25, 0.6);
  transition: color 200ms;
}

.nav-link:hover {
  color: var(--color-ink);
}

.nav-link--active {
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-ink);
  padding-bottom: 2px;
}


/* --- TOC Bar --- */
.toc-bar {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 3rem;
  padding: 0.75rem 1rem;
  width: 100%;
  background-color: var(--color-surface-low);
  border-top: 1px solid rgba(27, 28, 25, 0.05);
  border-bottom: 1px solid rgba(27, 28, 25, 0.05);
  position: sticky;
  top: 0;
  z-index: 40;
}

.toc-link {
  font-family: var(--font-label);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(27, 28, 25, 0.5);
  transition: color 200ms;
}

.toc-link:hover {
  color: var(--color-ink);
}

.toc-link--active {
  color: var(--color-ink);
  font-weight: 700;
}

.toc-link--pending {
  opacity: 0.3;
  cursor: default;
}


/* --- Edition Grid --- */
.edition-main {
  max-width: var(--max-content);
  margin: 0 auto;
  padding: 0 1.5rem;
}

@media (min-width: 768px) {
  .edition-main {
    padding: 0 3rem;
  }
}

.edition-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 768px) {
  .edition-grid {
    grid-template-columns: repeat(12, 1fr);
  }
}


/* --- Hero Section (Friday state) --- */
.edition-hero {
  margin-bottom: 8rem;
  padding-top: 6rem;
}

@media (min-width: 768px) {
  .edition-hero .hero-content {
    grid-column: 2 / 10;
  }
}

.hero-volume {
  font-family: var(--font-label);
  font-size: var(--text-label-sm);
  letter-spacing: var(--tracking-label-sm);
  text-transform: uppercase;
  opacity: 0.6;
  margin-bottom: 1.5rem;
  display: block;
}

.hero-title {
  font-family: var(--font-headline);
  font-size: var(--text-display);
  line-height: 1.1;
  letter-spacing: var(--tracking-display);
  font-style: italic;
  margin-bottom: 2rem;
}

.hero-subtitle {
  font-family: var(--font-body);
  font-size: var(--text-body-essay);
  max-width: 36rem;
  opacity: 0.8;
  line-height: 1.8;
  font-style: italic;
}


/* --- Poem Section (Monday state / compressed in Friday) --- */
.poem-section {
  margin-bottom: 12rem;
  padding-top: 8rem;
}

.poem-section--compressed {
  padding-top: 0;
}

/* Monday: left metadata column */
@media (min-width: 768px) {
  .poem-metadata-col {
    grid-column: 1 / 4;
  }

  .poem-content-col {
    grid-column: 5 / 12;
  }

  /* Friday compressed: poem centered */
  .poem-section--compressed .poem-aside {
    grid-column: 1 / 2;
    display: block;
  }

  .poem-section--compressed .poem-content-col {
    grid-column: 4 / 10;
    border-left: 1px solid rgba(198, 198, 198, 0.1);
    padding-left: 3rem;
  }
}

.poem-metadata-sticky {
  position: sticky;
  top: 10rem;
}

.poem-metadata-sticky .label-sm {
  display: block;
  margin-bottom: 0.5rem;
}

.poem-metadata-divider {
  border-top: 1px solid rgba(27, 28, 25, 0.1);
  width: 2rem;
  padding-top: 1rem;
  margin-bottom: 0.25rem;
}

.poem-title {
  font-family: var(--font-headline);
  font-size: var(--text-display);
  line-height: 1.1;
  letter-spacing: var(--tracking-display);
  font-style: italic;
  margin-bottom: 1.5rem;
}

.poem-title--compressed {
  font-family: var(--font-label);
  font-size: var(--text-label-md);
  letter-spacing: var(--tracking-label-md);
  text-transform: uppercase;
  font-style: normal;
  margin-bottom: 3rem;
}

.poem-body {
  font-family: var(--font-body);
  font-size: var(--text-body-lg);
  line-height: 1.8;
  font-style: italic;
  color: rgba(27, 28, 25, 0.9);
  max-width: var(--max-prose);
}

.poem-body p {
  margin-bottom: 2rem;
}

.poem-body .stanza-break {
  margin-bottom: 6rem;
}

.poem-aside {
  display: none;
}

.poem-aside-text {
  font-family: var(--font-label);
  font-size: 10px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  writing-mode: vertical-lr;
  transform: rotate(180deg);
  opacity: 0.4;
  height: 100%;
  display: flex;
  justify-content: flex-end;
}

.poem-byline {
  margin-top: 0.5rem;
}

.poem-marginalia {
  margin-top: 8rem;
  padding-top: 3rem;
  border-top: 1px solid rgba(27, 28, 25, 0.05);
}

.poem-marginalia p {
  font-family: var(--font-body);
  font-style: italic;
  font-size: 0.9rem;
  color: rgba(27, 28, 25, 0.7);
  line-height: 1.6;
  max-width: 66%;
}

.poem-cta {
  margin-top: 6rem;
}

.poem-cta a {
  font-family: var(--font-body);
  font-size: var(--text-body-essay);
  border-bottom: 1px solid rgba(27, 28, 25, 0.1);
  padding-bottom: 0.5rem;
  display: inline-flex;
  align-items: center;
  gap: 2rem;
  transition: border-color 300ms;
}

.poem-cta a:hover {
  border-color: var(--color-body);
}

.poem-cta .arrow {
  font-family: var(--font-label);
  font-size: var(--text-label-md);
  transition: transform 300ms;
}

.poem-cta a:hover .arrow {
  transform: translateX(4px);
}


/* --- Essay Section --- */
.essay-section {
  margin-bottom: 12rem;
  position: relative;
}

@media (min-width: 768px) {
  .essay-content-col {
    grid-column: 2 / 9;
  }

  .essay-marginalia-col {
    grid-column: 10 / 13;
    padding-top: 6rem;
  }
}

.essay-header {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.essay-header .label-divider {
  opacity: 0.3;
}

.essay-title {
  font-family: var(--font-headline);
  font-size: var(--text-headline);
  letter-spacing: var(--tracking-headline);
  margin-bottom: 3rem;
}

.essay-body {
  position: relative;
  max-height: 24rem;
  overflow: hidden;
  transition: max-height 400ms ease-in-out;
}

.essay-body.expanded {
  max-height: none;
}

.essay-body-inner {
  font-family: var(--font-body);
  font-size: var(--text-body-essay);
  line-height: 1.8;
  color: rgba(27, 28, 25, 0.9);
}

.essay-body-inner p {
  margin-bottom: 2rem;
}

.essay-body-inner p:last-child {
  margin-bottom: 0;
}

.paper-reveal {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 8rem;
  background: linear-gradient(to top, #fbf9f4 0%, rgba(251, 249, 244, 0) 100%);
  pointer-events: none;
  transition: opacity 400ms ease-in-out;
}

.essay-body.expanded .paper-reveal {
  opacity: 0;
}

.expand-trigger {
  margin-top: 2rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  font-family: var(--font-body);
  font-size: var(--text-body-essay);
}

.expand-trigger .expand-text {
  border-bottom: 1px solid var(--color-ink);
  padding-bottom: 2px;
}

.expand-trigger .expand-arrow {
  font-family: var(--font-label);
  font-size: var(--text-label-md);
  letter-spacing: var(--tracking-label-md);
  transition: transform 300ms;
}

.expand-trigger:hover .expand-arrow {
  transform: translateX(8px);
}

.essay-body.expanded + .expand-trigger {
  display: none;
}

.essay-marginalia {
  font-family: var(--font-body);
  font-style: italic;
  font-size: 0.85rem;
  line-height: 1.5;
  color: rgba(27, 28, 25, 0.6);
  opacity: 0.7;
}

@media (max-width: 767px) {
  .essay-marginalia-col {
    display: none;
  }
}


/* --- Correspondence Section --- */
.correspondence-section {
  margin-bottom: 12rem;
}

@media (min-width: 768px) {
  .correspondence-col {
    grid-column: 4 / 10;
  }
}

.correspondence-header {
  font-family: var(--font-label);
  font-size: var(--text-label-md);
  letter-spacing: var(--tracking-label-md);
  text-transform: uppercase;
  opacity: 0.6;
  margin-bottom: 3rem;
}

.letter {
  margin-bottom: 6rem;
  padding-left: 2rem;
  font-style: italic;
  border-left: 1px solid rgba(27, 28, 25, 0.05);
}

@media (min-width: 768px) {
  .letter {
    padding-left: 4rem;
  }
}

.letter-date {
  font-family: var(--font-label);
  font-size: var(--text-label-sm);
  letter-spacing: var(--tracking-label-md);
  text-transform: uppercase;
  opacity: 0.5;
  font-style: italic;
  margin-bottom: 1.5rem;
}

.letter-body {
  font-family: var(--font-body);
  font-size: var(--text-body-essay);
  line-height: 1.8;
  color: rgba(27, 28, 25, 0.8);
}

.letter-body p {
  margin-bottom: 1.5rem;
}


/* --- Shared Typography Utilities --- */
.label-md {
  font-family: var(--font-label);
  font-size: var(--text-label-md);
  letter-spacing: var(--tracking-label-md);
  text-transform: uppercase;
  font-weight: 500;
}

.label-sm {
  font-family: var(--font-label);
  font-size: var(--text-label-sm);
  letter-spacing: var(--tracking-label-sm);
  text-transform: uppercase;
  opacity: 0.6;
}

.italic {
  font-style: italic;
}


/* --- Footer --- */
.site-footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  width: 100%;
  padding: 4rem 2rem;
  margin-top: 6rem;
  background-color: var(--color-surface-low);
}

.footer-title {
  font-family: var(--font-headline);
  font-size: 1.25rem;
  font-style: italic;
}

.footer-nav {
  display: flex;
  gap: 3rem;
}

.footer-link {
  font-family: var(--font-label);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(27, 28, 25, 0.7);
  transition: color 200ms;
}

.footer-link:hover {
  color: var(--color-ink);
}


/* --- Archive Page --- */
.archive-page {
  max-width: 64rem;
  margin: 0 auto;
  padding: 8rem 2rem 12rem;
}

@media (min-width: 768px) {
  .archive-page {
    padding: 8rem 6rem 12rem;
  }
}

.archive-header {
  margin-bottom: 12rem;
  max-width: 40rem;
}

.archive-title {
  font-family: var(--font-headline);
  font-size: 4rem;
  font-style: italic;
  margin-bottom: 2rem;
  line-height: 1.1;
}

@media (min-width: 768px) {
  .archive-title {
    font-size: 6rem;
  }
}

.archive-subtitle {
  font-family: var(--font-label);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(27, 28, 25, 0.6);
  line-height: 1.8;
}

.archive-entries {
  display: flex;
  flex-direction: column;
  gap: 16rem;
}

.archive-entry {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

@media (min-width: 768px) {
  .archive-entry {
    flex-direction: row;
    align-items: baseline;
  }
}

.archive-entry-meta {
  width: 100%;
}

@media (min-width: 768px) {
  .archive-entry-meta {
    width: 33.333%;
  }
}

.archive-entry-label {
  font-family: var(--font-label);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  opacity: 0.4;
  display: block;
  margin-bottom: 1rem;
}

.archive-edition-number {
  font-family: var(--font-headline);
  letter-spacing: -0.05em;
  line-height: 1;
}

.archive-entry-content {
  flex: 1;
}

.archive-entry-info {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.archive-dot {
  color: rgba(198, 198, 198, 0.3);
}

.archive-pseudonym {
  font-family: var(--font-headline);
  font-style: italic;
}

.archive-pieces {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.archive-piece-link {
  font-family: var(--font-headline);
  transition: font-style 300ms, color 300ms;
}

.archive-piece-link:hover {
  font-style: italic;
}

/* Geological Recession */
.geo-1 { font-size: 3.5rem; opacity: 1; font-weight: 800; }
.geo-2 { font-size: 2.75rem; opacity: 0.8; font-weight: 700; }
.geo-3 { font-size: 2.25rem; opacity: 0.6; font-weight: 500; }
.geo-4 { font-size: 1.75rem; opacity: 0.45; font-weight: 400; }
.geo-5 { font-size: 1.25rem; opacity: 0.3; font-weight: 300; }
.geo-6 { font-size: 0.875rem; opacity: 0.15; font-weight: 200; }

.geo-1 ~ .archive-entry-content .archive-piece-link { font-size: 1.5rem; }
.geo-2 ~ .archive-entry-content .archive-piece-link { font-size: 1.25rem; }
.geo-3 ~ .archive-entry-content .archive-piece-link { font-size: 1.125rem; }
.geo-4 ~ .archive-entry-content .archive-piece-link { font-size: 1rem; }
.geo-5 ~ .archive-entry-content .archive-piece-link { font-size: 0.875rem; }
.geo-6 ~ .archive-entry-content .archive-piece-link { font-size: 0.75rem; }

.archive-marginalia {
  margin-top: 12rem;
  padding-top: 6rem;
  border-top: 1px solid rgba(198, 198, 198, 0.1);
  text-align: right;
  opacity: 0.4;
}

.archive-marginalia p {
  font-family: var(--font-headline);
  font-style: italic;
  font-size: 0.875rem;
  max-width: 20rem;
  margin-left: auto;
}


/* --- About Page --- */
.about-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 6rem 2rem 12rem;
}

@media (min-width: 768px) {
  .about-page {
    padding: 6rem 6rem 12rem;
  }
}

.about-hero {
  width: 100%;
  max-width: 72rem;
  display: grid;
  grid-template-columns: 1fr;
  row-gap: 6rem;
}

@media (min-width: 768px) {
  .about-hero {
    grid-template-columns: repeat(12, 1fr);
    column-gap: 2rem;
  }
}

@media (min-width: 768px) {
  .about-headline-col {
    grid-column: 1 / 9;
  }
}

.about-title {
  font-family: var(--font-headline);
  font-size: var(--text-display);
  line-height: 1.1;
  letter-spacing: var(--tracking-display);
  margin-bottom: 3rem;
}

.about-intro {
  max-width: 36rem;
}

.about-intro p {
  font-family: var(--font-body);
  font-size: 1.25rem;
  line-height: 1.8;
  margin-bottom: 2rem;
}

@media (min-width: 768px) {
  .about-marginalia-col {
    grid-column: 10 / 13;
    padding-top: 1rem;
  }
}

.about-marginalia-inner {
  border-left: 1px solid rgba(198, 198, 198, 0.1);
  padding-left: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.about-marginalia-inner .label-md {
  display: block;
  opacity: 0.6;
  margin-bottom: 0.5rem;
}

.about-marginalia-inner .tradition-list {
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-style: italic;
  line-height: 1.6;
  opacity: 0.8;
}

@media (max-width: 767px) {
  .about-marginalia-col {
    display: none;
  }
}

/* Colophon Grid */
.colophon-grid {
  grid-column: 1 / -1;
  margin-top: 6rem;
  border-top: 1px solid rgba(198, 198, 198, 0.1);
  padding-top: 6rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 4rem;
}

@media (min-width: 768px) {
  .colophon-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.colophon-section {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.colophon-section h2 {
  font-family: var(--font-label);
  font-size: var(--text-label-md);
  letter-spacing: var(--tracking-label-md);
  text-transform: uppercase;
  color: var(--color-ink);
}

.colophon-section p {
  font-family: var(--font-body);
  font-size: 0.875rem;
  line-height: 1.8;
  opacity: 0.8;
}

.colophon-persona-label {
  font-family: var(--font-label);
  font-size: var(--text-label-sm);
  letter-spacing: var(--tracking-label-sm);
  text-transform: uppercase;
  opacity: 0.6;
  display: block;
}

.colophon-persona-name {
  font-family: var(--font-body);
  font-size: var(--text-body-essay);
}

.colophon-persona-detail {
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-style: italic;
  opacity: 0.7;
}

.colophon-link {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
}

.colophon-link .arrow {
  font-family: var(--font-label);
  font-size: var(--text-label-md);
  margin-left: 0.25rem;
  display: inline-block;
  transition: transform 300ms;
}

.colophon-link:hover .arrow {
  transform: translateX(4px);
}

/* Anagrams Note */
.anagrams-note {
  margin-top: 8rem;
}

@media (min-width: 768px) {
  .anagrams-note {
    grid-column: 1 / 9;
  }
}

.anagrams-note-inner {
  background-color: var(--color-surface-low);
  padding: 3rem;
}

.anagrams-note-inner h3 {
  font-family: var(--font-headline);
  font-size: 1.5rem;
  font-style: italic;
  margin-bottom: 1.5rem;
}

.anagrams-note-inner p {
  font-family: var(--font-body);
  font-size: var(--text-body-essay);
  line-height: 1.8;
}

.anagrams-note-inner strong {
  font-weight: 700;
}


/* --- Responsive: Mobile Adjustments --- */
@media (max-width: 767px) {
  .site-header {
    padding: 1rem 1.5rem;
  }

  .site-nav {
    gap: 1.5rem;
  }

  .toc-bar {
    gap: 1.5rem;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    justify-content: flex-start;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
  }

  .hero-title,
  .poem-title,
  .about-title {
    font-size: 2.5rem;
  }

  .archive-title {
    font-size: 3rem;
  }

  .archive-entries {
    gap: 8rem;
  }

  .geo-1 { font-size: 2.5rem; }
  .geo-2 { font-size: 2rem; }
  .geo-3 { font-size: 1.75rem; }
  .geo-4 { font-size: 1.5rem; }
  .geo-5 { font-size: 1.125rem; }
  .geo-6 { font-size: 0.75rem; }

  .poem-metadata-col {
    margin-bottom: 2rem;
  }

  .letter {
    padding-left: 1.5rem;
  }
}