/* ---------------------------------------------------------------------------
   article.css — the site's chrome, applied to the writing.

   The articles used to be bare centred columns on a flat background while the
   home page had a floating nav, a grid field and accent wash. Same palette,
   different world. This gives them the same room: identical tokens, the same
   background treatment, the same header, so moving between them reads as one
   site rather than two.
--------------------------------------------------------------------------- */

/* --- Background --------------------------------------------------------- */

body {
  position: relative;
  z-index: 0;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -2;
  background-size: 100% 100%, 100% 100%, 40px 40px, 40px 40px;
  background-position: 0 0, 0 0, -1px -1px, -1px -1px;
  background-image:
    radial-gradient(ellipse 80% 50% at 15% 85%, rgba(var(--accent-rgb), 0.14), transparent),
    radial-gradient(ellipse 60% 40% at 85% 12%, rgba(var(--accent-rgb), 0.10), transparent),
    linear-gradient(var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
}

/* --- Floating header ---------------------------------------------------- */

.site-header {
  position: fixed;
  top: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  width: 90%;
  max-width: 900px;
  z-index: 500;
  border-radius: 999px;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  backdrop-filter: blur(20px) saturate(1.6);
  -webkit-backdrop-filter: blur(20px) saturate(1.6);
  box-shadow: var(--shadow-sm);
  transition: top var(--dur-base) var(--ease-out-expo),
              width var(--dur-base) var(--ease-out-expo),
              max-width var(--dur-base) var(--ease-out-expo),
              border-radius var(--dur-base) var(--ease-out-expo),
              box-shadow var(--dur-base) var(--ease-out-expo);
}

.site-header.header-compact {
  top: 0;
  width: 100%;
  max-width: 100%;
  border-radius: 0;
  border-color: transparent;
  border-bottom: 1px solid var(--card-border);
  box-shadow: var(--shadow-md);
}

.site-header .header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 1.4rem;
}

.site-header .logo-container {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--text);
}

.site-header .logo-icon {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  object-fit: cover;
}

.site-header .logo-text {
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin: 0;
}

.site-header nav {
  display: flex;
  gap: 1.35rem;
}

.site-header nav a {
  position: relative;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.84rem;
  transition: color var(--dur-fast) ease;
}

.site-header nav a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 100%;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: right center;
  transition: transform var(--dur-base) var(--ease-out-expo);
}

.site-header nav a:hover {
  color: var(--text);
}

.site-header nav a:hover::after {
  transform: scaleX(1);
  transform-origin: left center;
}

@media (max-width: 680px) {
  .site-header .logo-text { display: none; }
  .site-header nav { gap: 1rem; }
  .site-header nav a { font-size: 0.78rem; }
}

/* --- Article shell ------------------------------------------------------ */

.article-container {
  padding-top: 7.5rem;
}

.article-kicker {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

/* Reading progress sits under the header rather than over it. */
.reading-progress {
  z-index: 400;
}

/* --- Figures ------------------------------------------------------------ */

.article-content figure {
  margin: 2.5rem 0;
  border: 1px solid var(--card-border);
  border-radius: 14px;
  overflow: hidden;
  background: var(--card-bg);
  box-shadow: var(--shadow-sm);
}

.article-content figure img,
.article-content figure svg {
  display: block;
  width: 100%;
  height: auto;
}

.article-content figure.plot {
  padding: 1.25rem 1rem 0.5rem;
  color: var(--text);
}

.article-content figcaption {
  padding: 0.85rem 1.1rem 1rem;
  border-top: 1px solid var(--card-border);
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--muted);
}

.article-content figcaption b {
  color: var(--text);
  font-weight: 600;
}

.article-content figure.plot figcaption {
  border-top: 1px solid var(--card-border);
  margin-top: 0.75rem;
}

/* --- Pull quote and key claim ------------------------------------------- */

.article-content .claim {
  margin: 2.5rem 0;
  padding: 1.4rem 1.6rem;
  border-left: 3px solid var(--accent);
  border-radius: 0 12px 12px 0;
  background: rgba(var(--accent-rgb), 0.06);
  font-size: 1.12rem;
  line-height: 1.6;
  color: var(--text);
}

/* --- References --------------------------------------------------------- */

.article-content .references {
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--card-border);
}

.article-content .references h2 {
  margin-top: 0;
  font-size: 1.05rem;
}

.article-content .references ol {
  padding-left: 1.25rem;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.65;
}

.article-content .references li {
  margin-bottom: 0.6rem;
}

.article-content .references a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(var(--accent-rgb), 0.35);
}

/* --- Article footer nav ------------------------------------------------- */

.article-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  margin-top: 3.5rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--card-border);
}

.article-nav a {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.92rem;
  transition: transform var(--dur-base) var(--ease-out-expo);
  display: inline-block;
}

.article-nav a:hover {
  transform: translateX(3px);
}

.article-nav a.prev:hover {
  transform: translateX(-3px);
}