/* ─── Article Reading Layout ────────────────────────────────────
   Standalone styles for essay pages. Imports design tokens from
   the main site via CSS custom properties — no duplication. */

:root {
  --bg:        #f5f3ee;
  --ink:       #0a0a0a;
  --ink-mute:  #6b6b6b;
  --ink-soft:  #a8a8a8;
  --rule:      #1a1a1a;
  --rule-soft: #d8d5cd;
  --page-pad:  clamp(1.5rem, 5vw, 4rem);
}

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  scroll-behavior: smooth;
}

body {
  font-family: 'Space Grotesk', system-ui, sans-serif;
  font-size: 17px;
  line-height: 1.5;
  color: var(--ink);
  background-color: var(--bg);
  min-height: 100vh;
  overflow-x: hidden;
}

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

/* ─── Film grain (matches main site) ───────────────────────── */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9990;
  opacity: 0.028;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-size: 200px 200px;
  animation: grainShift 0.5s steps(1) infinite;
}
@keyframes grainShift {
  0%  { background-position:   0px   0px; }
  20% { background-position: -48px -20px; }
  40% { background-position:  24px -56px; }
  60% { background-position: -72px  12px; }
  80% { background-position:  16px  48px; }
}

/* ─── Article Header / Nav ──────────────────────────────────── */
.article-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  padding: 1.5rem var(--page-pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(245, 243, 238, 0.96);
  border-bottom: 1px solid var(--rule-soft);
  z-index: 20;
}

.article-back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-mute);
  transition: color 0.2s ease, gap 0.2s ease;
}
.article-back::before { content: '←'; transition: transform 0.2s ease; }
.article-back:hover { color: var(--ink); gap: 0.75rem; }
.article-back:hover::before { transform: translateX(-3px); }

.article-logo img {
  display: block;
  height: clamp(22px, 2.5vw, 34px);
  width: auto;
  filter: brightness(0);
}

/* ─── Reading Column ────────────────────────────────────────── */
.article-main {
  padding-top: clamp(7rem, 14vh, 10rem);
  padding-bottom: clamp(5rem, 10vh, 8rem);
  padding-left: var(--page-pad);
  padding-right: var(--page-pad);
}

.article-wrap {
  max-width: 680px;
  margin: 0 auto;
}

/* ─── Cover image ───────────────────────────────────────────── */
.article-cover {
  margin: 0 0 2.4rem;
  width: 100%;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  background: #ece8df;
  border: 1px solid var(--rule-soft, rgba(10,10,10,0.08));
}
.article-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.article-cover--placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
}

.article-cover--grid {
  background-image: url('episteme-grid.png');
  background-size: 300% 200%;
  background-repeat: no-repeat;
}
.article-cover--grid-1 { background-position: left top; }
.article-cover--grid-2 { background-position: center top; }
.article-cover--grid-3 { background-position: right top; }
.article-cover--grid-4 { background-position: left bottom; }
.article-cover--grid-5 { background-position: center bottom; }
.article-cover--grid-6 { background-position: right bottom; }

.article-cover-label {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

/* ─── Kicker ────────────────────────────────────────────────── */
.article-kicker {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 1.4rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}
.article-kicker::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--rule-soft);
  max-width: 48px;
}

/* ─── Title ─────────────────────────────────────────────────── */
.article-title {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: clamp(2rem, 4.5vw, 3rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--ink);
  margin-bottom: 2rem;
}

/* ─── Divider ───────────────────────────────────────────────── */
.article-rule {
  border: none;
  border-top: 1px solid var(--rule);
  margin-bottom: 2.8rem;
}

/* ─── Section headings ──────────────────────────────────────── */
.article-body h2 {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-top: 2.8rem;
  margin-bottom: 1.2rem;
  scroll-margin-top: 6rem;
}

/* ─── Table of Contents ─────────────────────────────────────── */
.article-toc {
  display: none;
  position: fixed;
  top: 6rem;
  right: clamp(1.5rem, 3vw, 3rem);
  width: 148px;
  z-index: 10;
}

@media (min-width: 1140px) {
  .article-toc { display: block; }
}

.article-toc-label {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.62rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 0.75rem;
}

.article-toc-list {
  list-style: none;
  border-left: 1px solid var(--rule-soft);
  padding-left: 0.9rem;
}

.article-toc-list li {
  margin-bottom: 0.55rem;
}

.article-toc-list a {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.66rem;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  line-height: 1.4;
  display: block;
  transition: color 0.2s ease;
}

.article-toc-list a:hover,
.article-toc-list a.active {
  color: var(--ink);
}

/* ─── Body Prose ────────────────────────────────────────────── */
.article-body {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--ink);
}

.article-body p {
  margin-bottom: 1.6em;
}

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

/* ─── Footer ────────────────────────────────────────────────── */
.article-footer {
  padding: clamp(4rem, 8vh, 6rem) var(--page-pad) clamp(3rem, 6vh, 4rem);
  border-top: 1px solid var(--rule);
}

.article-footer-inner {
  max-width: 680px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.article-footer-label {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.article-footer-back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  border-bottom: 1px solid var(--ink);
  padding-bottom: 2px;
  transition: gap 0.2s ease;
}
.article-footer-back::before { content: '←'; }
.article-footer-back:hover { gap: 0.8rem; }

/* ─── Fade-in entrance ──────────────────────────────────────── */
.article-wrap {
  animation: articleIn 0.9s cubic-bezier(0.16, 1, 0.3, 1) both;
}
@keyframes articleIn {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ─── Mobile ────────────────────────────────────────────────── */
@media (max-width: 560px) {
  .article-title {
    font-size: clamp(1.6rem, 7vw, 2.2rem);
  }
  .article-body {
    font-size: 1rem;
    line-height: 1.75;
  }
  .article-footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.2rem;
  }
}