/* article.css - long-form article template
   Extends site.css (warm-editorial tokens). Do NOT redefine :root tokens.
   Single centered column: header + inline TOC chip bar + body + share +
   related grid + prev/next + back-to-writing. Honors prefers-reduced-motion.
   No horizontal overflow at any width. */

/* ----------------------------------------------------------------- -- Reading progress */
.article-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 3px;
  z-index: 60;
  background: transparent;
  pointer-events: none;
}
.article-progress__bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-strong));
  transform-origin: left center;
  will-change: width;
}
.article-progress[data-anim="false"] .article-progress__bar { transition: none; }
.article-progress[data-anim="true"]  .article-progress__bar { transition: width 80ms linear; }

/* ----------------------------------------------------------------- -- Breadcrumb */
.article-breadcrumb {
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(5.5rem, 12vh, 7rem) clamp(1.25rem, 5vw, 4rem) var(--sp-2);
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.06em;
  color: var(--muted);
}
.article-breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin: 0;
  padding: 0;
}
.article-breadcrumb li { display: inline-flex; align-items: center; gap: 0.5rem; }
.article-breadcrumb li + li::before {
  content: "/";
  color: var(--border-strong);
  margin-right: 0.25rem;
}
.article-breadcrumb a { color: var(--muted); transition: color var(--dur-fast); }
.article-breadcrumb a:hover { color: var(--accent-strong); }
.article-breadcrumb [aria-current="page"] { color: var(--fg); }

/* ----------------------------------------------------------------- -- Article layout shell */
.article {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 5vw, 4rem) var(--sp-6);
  display: block;
}

/* ----------------------------------------------------------------- -- Header */
.article__header {
  margin: 0 0 var(--sp-5);
}

.article__topic {
  display: inline-flex;
  align-items: center;
  justify-content: flex-start;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-strong);
  margin: 0 0 var(--sp-2);
}
.article__topic::before {
  content: "";
  width: 1.5rem;
  height: 1px;
  background: var(--accent);
}
.article__title {
  font-family: var(--font-display);
  font-size: var(--fs-h1);
  line-height: 1.05;
  letter-spacing: -0.022em;
  font-weight: 380;
  font-variation-settings: "opsz" 96;
  margin: 0 0 var(--sp-2);
  color: var(--fg);
}
.article__dek {
  font-size: var(--fs-lede);
  line-height: 1.5;
  color: var(--fg-soft);
  margin: 0 0 var(--sp-3);
}
.article__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem var(--sp-3);
  align-items: center;
  font-size: var(--fs-small);
  color: var(--muted);
  padding-top: var(--sp-2);
  border-top: var(--bw) solid var(--border);
  margin-top: var(--sp-2);
}
.article__meta .byline { color: var(--fg); }
.article__meta .byline strong { font-weight: 600; }
.article__meta .dot { color: var(--border-strong); }
.article__source {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--accent-strong);
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: var(--accent);
}
.article__source:hover { color: var(--accent); }

/* ----------------------------------------------------------------- -- Inline contents (opt-in)
   Sits between header and body. Emitted by render.js ONLY when an article
   sets `toc: true` (and has >= 2 H2s) — the TOC is off by default because
   these sequential guides have too-fine/repetitive headings for a useful one.
   A quiet, compact directory of plain links — not a pill wall. Two columns on
   wide screens, one column under 640px; capped height with a thin scrollbar
   for long curated lists. article.js scroll-spy sets aria-current="true" on
   the active link. */
.article__toc {
  margin: 0 0 var(--sp-5);
  padding: var(--sp-3) var(--sp-4);
  border: var(--bw) solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--r);
  background: var(--surface);
}
.article__toc-title {
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 var(--sp-2);
}
.article__toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: var(--sp-5);
  row-gap: 0.15rem;
  /* Graceful cap for a genuinely long curated list: scroll instead of
     dominating the page. 22rem ~= 10 rows in two columns. */
  max-height: 22rem;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}
.article__toc-list li { min-width: 0; }
.article__toc-list a {
  display: block;
  font-family: var(--font-body);
  font-size: var(--fs-small);
  line-height: 1.35;
  padding: 0.3rem 0;
  color: var(--fg-soft);
  border-bottom: 1px solid transparent;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition:
    color var(--dur-fast) var(--ease-soft),
    border-color var(--dur-fast) var(--ease-soft),
    padding-left var(--dur-fast) var(--ease-soft);
}
.article__toc-list a:hover {
  color: var(--fg);
  border-bottom-color: var(--border-strong);
  padding-left: 0.35rem;
}
.article__toc-list a[aria-current="true"] {
  color: var(--accent-strong);
  font-weight: 600;
  border-bottom-color: var(--accent);
  padding-left: 0.35rem;
}
.article__toc[data-anim="false"] .article__toc-list a { transition: none; }

/* One column on narrow screens; tighter padding. */
@media (max-width: 640px) {
  .article__toc { padding: var(--sp-3); }
  .article__toc-list {
    grid-template-columns: 1fr;
    column-gap: 0;
    max-height: 18rem;
  }
}

/* ----------------------------------------------------------------- -- Body typography */
.article__body {
  margin-inline: 0;
  font-size: 1.125rem;
  line-height: 1.72;
  color: var(--fg);
  overflow-wrap: anywhere;   /* break long URLs / tokens so they never blow out the column */
  word-break: break-word;
}
.article__body > * { max-width: 100%; }
.article__body p { margin: 0 0 var(--sp-3); }
.article__body a {
  color: var(--fg);
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
}
.article__body a:hover { color: var(--accent-strong); }
.article__body strong { color: var(--fg); font-weight: 600; }
.article__body em { font-style: italic; }

.article__body h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  line-height: 1.15;
  letter-spacing: -0.018em;
  font-weight: 420;
  font-variation-settings: "opsz" 60;
  margin: var(--sp-5) 0 var(--sp-2);
  scroll-margin-top: clamp(6rem, 12vh, 8rem);
  color: var(--fg);
}
.article__body h3 {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2vw, 1.45rem);
  font-weight: 500;
  margin: var(--sp-4) 0 var(--sp-2);
  scroll-margin-top: clamp(6rem, 12vh, 8rem);
}
.article__body h4 {
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: 600;
  margin: var(--sp-3) 0 var(--sp-1);
}

.article__body ul,
.article__body ol { padding-left: 1.4rem; margin: 0 0 var(--sp-3); }
.article__body li { margin-bottom: 0.5rem; }
.article__body li::marker { color: var(--accent-strong); }

.article__body hr {
  border: none;
  height: 1px;
  background: var(--border);
  margin: var(--sp-5) auto;
  width: 4rem;
}

/* Inline code */
.article__body code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--surface-warm);
  padding: 0.12em 0.4em;
  border-radius: var(--r-sm);
  border: var(--bw) solid var(--border-soft);
}

/* ----------------------------------------------------------------- -- Code blocks */
.article__body pre {
  position: relative;
  background: var(--surface);
  border: var(--bw) solid var(--border);
  border-radius: var(--r);
  padding: var(--sp-3) var(--sp-3) var(--sp-3);
  margin: 0 0 var(--sp-3);
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.6;
}
.article__body pre code {
  font-family: var(--font-mono);
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
  display: block;
  min-width: max-content;
}
.article__body pre[data-lang]::before {
  content: attr(data-lang);
  position: absolute;
  top: 0;
  left: 0;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--surface-muted);
  padding: 0.2rem 0.55rem;
  border-radius: 0 0 var(--r-sm) 0;
  border-right: var(--bw) solid var(--border);
  border-bottom: var(--bw) solid var(--border);
}
.article__body pre[data-lang] { padding-top: calc(var(--sp-3) + 1.1rem); }
.article-code-copy {
  position: absolute;
  top: var(--sp-1);
  right: var(--sp-1);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  background: var(--surface-muted);
  border: var(--bw) solid var(--border);
  border-radius: var(--r-sm);
  padding: 0.25rem 0.5rem;
  transition: color var(--dur-fast), border-color var(--dur-fast), background var(--dur-fast);
}
.article-code-copy:hover { color: var(--fg); border-color: var(--border-strong); }
.article-code-copy[data-copied="true"] {
  color: var(--accent-strong);
  border-color: var(--accent);
  background: var(--accent-soft);
}

/* ----------------------------------------------------------------- -- Blockquote + pull-quote */
.article__body blockquote {
  margin: var(--sp-4) 0;
  padding: var(--sp-1) 0 var(--sp-1) var(--sp-3);
  border-left: 3px solid var(--border-strong);
  color: var(--fg-soft);
  font-style: italic;
}
.article__body blockquote p { margin: 0 0 var(--sp-1); }
.article__body blockquote p:last-child { margin-bottom: 0; }
.article__body blockquote cite {
  display: block;
  margin-top: var(--sp-1);
  font-size: var(--fs-small);
  font-style: normal;
  color: var(--muted);
}

.pull-quote {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.6vw, 1.9rem);
  line-height: 1.3;
  letter-spacing: -0.012em;
  font-weight: 420;
  font-variation-settings: "opsz" 60;
  color: var(--fg);
  border-left: 3px solid var(--accent);
  padding: var(--sp-2) 0 var(--sp-2) var(--sp-3);
  margin: var(--sp-5) 0;
  font-style: normal;
}
.pull-quote cite {
  display: block;
  margin-top: var(--sp-2);
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-strong);
}

/* ----------------------------------------------------------------- -- Callouts */
.callout {
  display: flex;
  gap: var(--sp-2);
  align-items: flex-start;
  padding: var(--sp-2) var(--sp-3);
  margin: var(--sp-4) 0;
  border: var(--bw) solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--r);
  background: var(--surface-warm);
}
.callout--info  { border-left-color: var(--accent-2);   background: var(--surface-warm); }
.callout--tip   { border-left-color: var(--accent);      background: var(--surface-warm); }
.callout--warn  { border-left-color: var(--accent-strong); background: var(--surface-muted); }
.callout__icon {
  flex: 0 0 auto;
  width: 1.25rem;
  height: 1.25rem;
  color: var(--accent-strong);
  margin-top: 0.2rem;
}
.callout__body { min-width: 0; }
.callout__title {
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-strong);
  margin: 0 0 0.25rem;
}
.callout p:last-child { margin-bottom: 0; }

/* ----------------------------------------------------------------- -- Images + captions */
.article__body figure { margin: var(--sp-4) 0; text-align: center; }
.article__body figure img {
  display: block;
  margin: 0 auto;
  border-radius: var(--r);
  border: var(--bw) solid var(--border);
  max-width: 100%;
  height: auto;
}
.article__body figcaption {
  margin-top: var(--sp-1);
  font-size: var(--fs-small);
  color: var(--muted);
  font-style: italic;
  max-width: 40rem;
  margin-inline: auto;
}

/* ----------------------------------------------------------------- -- Gallery */
.gallery {
  display: grid;
  gap: var(--sp-2);
  margin: var(--sp-4) 0;
}
.gallery--2 { grid-template-columns: repeat(2, 1fr); }
.gallery--3 { grid-template-columns: repeat(3, 1fr); }
.gallery--4 { grid-template-columns: repeat(2, 1fr); }
.gallery figure { margin: 0; }
.gallery img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  cursor: zoom-in;
  border-radius: var(--r);
  border: var(--bw) solid var(--border);
  transition: transform var(--dur-fast) var(--ease-out);
}
.gallery img:hover { transform: scale(1.01); }
.gallery[data-anim="false"] img { transition: none; cursor: zoom-in; }
@media (max-width: 640px) {
  .gallery--2, .gallery--3, .gallery--4 { grid-template-columns: 1fr; }
}

/* ----------------------------------------------------------------- -- Tables */
.article__body .table-wrap { overflow-x: auto; margin: 0 0 var(--sp-3); border: var(--bw) solid var(--border); border-radius: var(--r); }
.article__body table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--fs-small);
  min-width: max-content;
}
.article__body th,
.article__body td {
  text-align: left;
  padding: var(--sp-1) var(--sp-2);
  border-bottom: var(--bw) solid var(--border);
  vertical-align: top;
}
.article__body thead th {
  background: var(--surface-muted);
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg);
}
.article__body tbody tr:last-child td { border-bottom: none; }
.article__body tbody tr:nth-child(even) { background: var(--surface); }

/* ----------------------------------------------------------------- -- Share row */
.article__share {
  margin: var(--sp-5) 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-2);
  align-items: center;
  padding-block: var(--sp-4);
  border-top: var(--bw) solid var(--border);
}
.article__share-label {
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-right: var(--sp-1);
}
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 0.85rem;
  border: var(--bw) solid var(--border);
  border-radius: var(--r);
  font-size: var(--fs-small);
  color: var(--fg);
  background: var(--surface);
  transition: border-color var(--dur-fast), color var(--dur-fast), background var(--dur-fast);
}
.share-btn:hover { border-color: var(--accent); color: var(--accent-strong); background: var(--surface-warm); }
.share-btn[data-copied="true"] { color: var(--accent-strong); border-color: var(--accent); }
.share-btn svg { width: 15px; height: 15px; }

/* ----------------------------------------------------------------- -- Related (end section, full container width) */
.article__related {
  margin-top: 0;
  padding-top: var(--sp-4);
  border-top: var(--bw) solid var(--border);
}
.article__related-title {
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 2.4vw, 1.7rem);
  line-height: 1.2;
  letter-spacing: -0.012em;
  font-weight: 420;
  font-variation-settings: "opsz" 60;
  color: var(--fg);
  margin: 0;
}
.article__related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-3);
  margin-top: var(--sp-3);
}
@media (max-width: 820px) {
  .article__related-grid { grid-template-columns: 1fr; }
}

.related-card {
  display: block;
  padding: var(--sp-3);
  border: var(--bw) solid var(--border);
  border-radius: var(--r);
  background: var(--surface);
  color: var(--fg);
  transition: border-color var(--dur-fast), color var(--dur-fast), background var(--dur-fast);
}
.related-card:hover {
  color: var(--accent-strong);
  border-color: var(--accent);
  background: var(--surface-warm);
}
.related-card .related-card__topic {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  display: block;
  margin-bottom: 0.4rem;
}
.related-card .related-card__title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  line-height: 1.3;
  font-weight: 500;
}

/* ----------------------------------------------------------------- -- Prev / next nav */
.article__pagenav {
  margin: var(--sp-5) 0 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-2);
  border-top: var(--bw) solid var(--border);
  padding-top: var(--sp-4);
}
.article__pagenav a {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: var(--sp-2);
  border: var(--bw) solid var(--border);
  border-radius: var(--r);
  background: var(--surface);
  transition: border-color var(--dur-fast);
}
.article__pagenav a:hover { border-color: var(--accent); }
.article__pagenav .pn-label {
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}
.article__pagenav .pn-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  line-height: 1.3;
  color: var(--fg);
}
.article__pagenav .pn-next { text-align: right; }
@media (max-width: 640px) {
  .article__pagenav { grid-template-columns: 1fr; }
  .article__pagenav .pn-next { text-align: left; }
}

/* ----------------------------------------------------------------- -- Back to writing */
.article__back {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--muted);
  margin: var(--sp-5) 0 0;
  transition: color var(--dur-fast);
}
.article__back:hover { color: var(--fg); }
.article__back-wrap { margin: 0; }

/* ----------------------------------------------------------------- -- Lightbox */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(36, 33, 31, 0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-4);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur) var(--ease-out), visibility var(--dur);
}
.lightbox[data-open="true"] { opacity: 1; visibility: visible; }
.lightbox[data-anim="false"] { transition: none; }
.lightbox img {
  max-width: min(92vw, 1100px);
  max-height: 88vh;
  border-radius: var(--r);
  box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}
.lightbox__close {
  position: absolute;
  top: var(--sp-3);
  right: var(--sp-3);
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--bg);
  border: var(--bw) solid rgba(255,255,255,0.3);
  border-radius: 50%;
  font-size: 1.5rem;
  line-height: 1;
}
.lightbox__close:hover { background: rgba(255,255,255,0.1); }

/* ----------------------------------------------------------------- -- Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .article-progress__bar,
  .article__toc-list a,
  .gallery img,
  .lightbox,
  .share-btn,
  .related-card,
  .article__pagenav a { transition: none !important; }
  html { scroll-behavior: auto; }
}