/* ===========================================================
   Folio Format — Journal stylesheet
   Shared by /blog/index.html and every individual post under
   /blog/<slug>/index.html. Tokens mirror the main landing
   page so the journal feels like a chapter in the same book,
   not a separate site.
   =========================================================== */

:root {
  /* Surfaces */
  --ink:           #0E0D0B;
  --ink-soft:      #1A1816;
  --ink-muted:     #3A3530;
  --ink-dim:       #6B635A;
  --parchment:     #F5F0E6;
  --parchment-deep: #EAE3D2;
  --parchment-soft: #FBF8F1;
  --surface:       #FFFFFF;

  /* Brass accents */
  --brass:        #A98A4B;
  --brass-deep:   #7D6332;
  --brass-light:  #C9A968;
  --brass-glow:   rgba(201, 169, 104, 0.18);

  /* Hairlines */
  --hairline-dark:        rgba(245, 240, 230, 0.12);
  --hairline-dark-strong: rgba(245, 240, 230, 0.22);

  /* Type stack — identical to the home page */
  --font-display: 'Fraunces', Georgia, serif;
  --font-serif:   'EB Garamond', Georgia, serif;
  --font-body:    'Archivo', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --bg:        var(--ink);
  --bg-soft:   var(--ink-soft);
  --fg:        var(--parchment-soft);
  --fg-muted:  rgba(245, 240, 230, 0.72);
  --border:    var(--hairline-dark);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.65;
  font-feature-settings: "kern", "liga", "onum", "calt";
  overflow-x: hidden;
}
img, picture, video, canvas, svg { display: block; max-width: 100%; }
button { font-family: inherit; font-size: inherit; background: none; border: none; color: inherit; cursor: pointer; }
a { color: inherit; text-decoration: none; }
::selection { background: var(--brass); color: var(--ink); }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0);
  white-space: nowrap; border: 0;
}

/* Skip-to-main link — first focusable element on each blog page.
   Mirrors the home page convention. */
.skip-to-main {
  position: absolute;
  top: 0; left: 0;
  padding: 12px 18px;
  font-family: var(--font-body);
  font-size: 11px; font-weight: 600;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--ink);
  background: var(--brass);
  border: 1px solid var(--brass);
  transform: translateY(-110%);
  transition: transform 200ms ease;
  z-index: 9999;
}
.skip-to-main:focus, .skip-to-main:focus-visible {
  outline: none; transform: translateY(0);
}
main:focus, main:focus-visible { outline: none; }

/* Background wash matches the home page */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background:
    radial-gradient(circle at 18% 8%, rgba(201, 169, 104, 0.08), transparent 28%),
    radial-gradient(circle at 84% 18%, rgba(90, 30, 30, 0.12), transparent 30%),
    linear-gradient(180deg, rgba(255,255,255,0.018), transparent 24%);
}

/* ===========================================================
   NAV — mirrored from the home page so the journal pages feel
   like the same site, with one journal-aware tweak: a journal
   link is added inline and the wordmark links back to root.
   =========================================================== */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 32px;
  padding: 18px 32px;
  background: rgba(14, 13, 11, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.18);
}
.site-nav-wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-display);
  font-weight: 500;
  letter-spacing: -0.005em;
  font-variation-settings: "opsz" 36;
}
.site-nav-wordmark-folio { font-size: 18px; color: var(--fg); }
.site-nav-wordmark-format {
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.36em;
  text-transform: uppercase;
  color: var(--brass);
}
.site-nav-wordmark::before {
  content: "";
  width: 15px;
  height: 18px;
  margin-right: 8px;
  display: inline-block;
  vertical-align: -3px;
  background:
    linear-gradient(90deg, transparent 48%, var(--brass) 48%, var(--brass) 52%, transparent 52%),
    linear-gradient(90deg, transparent 7%, var(--brass) 7%, var(--brass) 13%, transparent 13%, transparent 87%, var(--brass) 87%, var(--brass) 93%, transparent 93%);
  border: 1px solid var(--brass);
  opacity: 0.9;
}
.site-nav-spacer { flex: 1; }
.site-nav-link, .site-nav-cta {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--fg-muted);
  transition: color 200ms ease;
}
.site-nav-link:hover, .site-nav-cta:hover { color: var(--brass-light); }
.site-nav-link.is-current { color: var(--brass-light); }
.site-nav-cta {
  padding: 10px 20px;
  border: 1px solid var(--brass);
  color: var(--brass);
}
.site-nav-cta:hover { background: var(--brass); color: var(--ink); }
@media (max-width: 600px) {
  .site-nav { gap: 16px; padding: 14px 20px; }
  .site-nav-link { display: none; }
}

/* ===========================================================
   ARTICLE WRAPPER + SHARED TYPOGRAPHY
   The journal uses a measured single-column reading width.
   No sidebars. The body reads like the inside of the book.
   =========================================================== */
.journal-wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 96px 32px 128px;
}
@media (max-width: 720px) {
  .journal-wrap { padding: 64px 24px 96px; }
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--brass);
}
.eyebrow-rule {
  width: 24px; height: 1px;
  background: var(--brass);
  opacity: 0.6;
}

.journal-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 28px 0 0;
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--fg-muted);
}
.journal-meta time { color: var(--fg-muted); }
.journal-meta-sep { color: var(--brass); opacity: 0.6; }

/* ===========================================================
   INDEX PAGE — list of posts
   =========================================================== */
.journal-index-header {
  margin-bottom: 64px;
  border-bottom: 1px solid var(--hairline-dark);
  padding-bottom: 40px;
}
.journal-index-title {
  margin: 24px 0 16px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(44px, 6vw, 72px);
  line-height: 1.04;
  letter-spacing: -0.018em;
  color: var(--fg);
  font-variation-settings: "opsz" 144;
}
.journal-index-title em { font-style: italic; font-variation-settings: "opsz" 144; }
.journal-index-lede {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 20px;
  line-height: 1.55;
  color: var(--fg-muted);
  max-width: 56ch;
}

.journal-list { list-style: none; }
.journal-list-item {
  padding: 36px 0;
  border-bottom: 1px solid var(--hairline-dark);
}
.journal-list-item:first-child { padding-top: 0; }
.journal-list-item:last-child { border-bottom: none; }
.journal-list-link {
  display: block;
  transition: color 200ms ease;
}
.journal-list-link:hover .journal-list-title,
.journal-list-link:focus-visible .journal-list-title {
  color: var(--brass-light);
}
.journal-list-link:focus-visible {
  outline: none;
  box-shadow: 0 2px 0 0 var(--brass);
}
.journal-list-title {
  margin: 14px 0 10px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--fg);
  font-variation-settings: "opsz" 96;
  transition: color 200ms ease;
}
.journal-list-title em { font-style: italic; font-variation-settings: "opsz" 96; }
.journal-list-desc {
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.6;
  color: var(--fg-muted);
  max-width: 60ch;
}

/* ===========================================================
   POST PAGE — long-form reading
   =========================================================== */
.post-header { margin-bottom: 48px; }
.post-title {
  margin: 24px 0 16px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(36px, 5vw, 56px);
  line-height: 1.08;
  letter-spacing: -0.018em;
  color: var(--fg);
  font-variation-settings: "opsz" 144;
}
.post-title em { font-style: italic; font-variation-settings: "opsz" 144; }
.post-deck {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 21px;
  line-height: 1.5;
  color: var(--fg-muted);
  max-width: 56ch;
  margin-top: 8px;
}

.post-body {
  font-family: var(--font-serif);
  font-size: 19px;
  line-height: 1.72;
  color: var(--fg);
}
.post-body p {
  margin: 0 0 1.3em;
  max-width: 64ch;
}
.post-body p:first-of-type::first-line {
  font-variant-caps: small-caps;
  letter-spacing: 0.05em;
}
.post-body h2 {
  margin: 2.4em 0 0.6em;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(24px, 2.6vw, 30px);
  line-height: 1.2;
  letter-spacing: -0.005em;
  color: var(--fg);
  font-variation-settings: "opsz" 96;
}
.post-body h2 em { font-style: italic; font-variation-settings: "opsz" 96; }
.post-body h3 {
  margin: 1.8em 0 0.4em;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 21px;
  line-height: 1.25;
  color: var(--fg);
  font-variation-settings: "opsz" 36;
}
.post-body ul, .post-body ol {
  margin: 0 0 1.3em 1.2em;
  max-width: 60ch;
}
.post-body li {
  margin-bottom: 0.4em;
  padding-left: 0.3em;
}
.post-body strong {
  color: var(--fg);
  font-weight: 600;
}
.post-body em { font-style: italic; }
.post-body code {
  font-family: 'Fira Code', 'SF Mono', Menlo, Consolas, monospace;
  font-size: 0.88em;
  background: rgba(255, 255, 255, 0.04);
  padding: 2px 6px;
  border: 1px solid var(--hairline-dark);
  color: var(--brass-light);
}
.post-body a {
  color: var(--brass-light);
  border-bottom: 1px solid rgba(201, 169, 104, 0.35);
  transition: color 200ms ease, border-color 200ms ease;
}
.post-body a:hover {
  color: var(--brass);
  border-bottom-color: var(--brass);
}
.post-body blockquote {
  margin: 1.6em 0;
  padding: 4px 0 4px 24px;
  border-left: 1px solid var(--brass);
  font-style: italic;
  color: var(--fg-muted);
  max-width: 60ch;
}

/* Section break ornament between major parts of a long post */
.post-break {
  text-align: center;
  margin: 2.4em 0;
  color: var(--brass);
  font-size: 14px;
  letter-spacing: 0.6em;
  text-indent: 0.6em;
}

/* Inline schematic for cover-layout / spread diagrams. Uses the same
   panelled-card chrome as .post-data-card for visual consistency. */
.post-spread-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin: 1.4em 0 1.8em;
  padding: 14px 18px;
  border: 1px solid var(--hairline-dark);
  border-left: 2px solid var(--brass);
  background: rgba(255, 255, 255, 0.018);
  font-family: var(--font-body);
  font-size: 12px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--brass-light);
}
.post-spread-diagram-sep { color: var(--brass); opacity: 0.6; }

/* Inline data card — used for KDP tables and worked examples */
.post-data-card {
  margin: 2em 0;
  padding: 22px 26px;
  background: rgba(255, 255, 255, 0.018);
  border: 1px solid var(--hairline-dark);
  border-left: 2px solid var(--brass);
}
.post-data-card-title {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.36em;
  text-transform: uppercase;
  color: var(--brass);
}
.post-data-card p { margin-bottom: 0.6em; }
.post-data-card p:last-child { margin-bottom: 0; }
.post-data-card table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--fg);
}
.post-data-card th, .post-data-card td {
  text-align: left;
  padding: 8px 12px 8px 0;
  border-bottom: 1px solid var(--hairline-dark);
}
.post-data-card th {
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 11px;
  color: var(--brass);
}
.post-data-card tr:last-child td { border-bottom: none; }

/* ===========================================================
   POST FOOTER — closing note + related posts
   =========================================================== */
.post-cta {
  margin: 80px 0 0;
  padding: 40px 32px;
  background: var(--bg-soft);
  border: 1px solid var(--hairline-dark);
  text-align: center;
}
.post-cta-eyebrow {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.36em;
  text-transform: uppercase;
  color: var(--brass);
  margin-bottom: 16px;
}
.post-cta-title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(22px, 2.4vw, 28px);
  line-height: 1.25;
  color: var(--fg);
  margin-bottom: 12px;
  font-variation-settings: "opsz" 96;
}
.post-cta-title em { font-style: italic; font-variation-settings: "opsz" 96; }
.post-cta-lede {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 16px;
  line-height: 1.5;
  color: var(--fg-muted);
  max-width: 56ch;
  margin: 0 auto 24px;
}
.post-cta-fineprint {
  margin-top: 16px;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 14px;
  color: var(--fg-muted);
}
.post-cta-fineprint em {
  color: var(--brass-light);
  font-style: normal;
}
@media (max-width: 600px) {
  .post-cta { padding: 32px 22px; }
}

.post-related {
  margin: 64px 0 0;
  padding-top: 32px;
  border-top: 1px solid var(--hairline-dark);
}
.post-related-eyebrow {
  display: block;
  margin-bottom: 16px;
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.36em;
  text-transform: uppercase;
  color: var(--brass);
}
.post-related-list {
  list-style: none;
}
.post-related-list li {
  margin-bottom: 14px;
}
.post-related-list a {
  font-family: var(--font-display);
  font-size: 18px;
  color: var(--fg);
  font-variation-settings: "opsz" 36;
  border-bottom: 1px solid transparent;
  transition: color 200ms ease, border-color 200ms ease;
}
.post-related-list a:hover {
  color: var(--brass-light);
  border-bottom-color: var(--brass);
}

.post-back {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--fg-muted);
  transition: color 200ms ease;
}
.post-back:hover { color: var(--brass-light); }
.post-back::before { content: "←"; }

/* Table of contents — only on longer technical posts. Hairline rule,
   italic deck-style links, no bullets. */
.post-toc {
  margin: 2em 0 2.4em;
  padding: 22px 26px;
  border-top: 1px solid var(--hairline-dark);
  border-bottom: 1px solid var(--hairline-dark);
}
.post-toc-label {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.36em;
  text-transform: uppercase;
  color: var(--brass);
}
.post-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.post-toc-list a {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 17px;
  color: var(--fg);
  border-bottom: 1px solid transparent;
  transition: color 200ms ease, border-color 200ms ease;
}
.post-toc-list a:hover {
  color: var(--brass-light);
  border-bottom-color: var(--brass);
}

/* "Last checked" footer block. Combines the date stamp with the
   approved KDP-acceptance hedge so both live in one editorial
   place at the end of every technical post. */
.post-last-checked {
  margin: 48px 0 0;
  padding: 24px 26px;
  border-top: 1px solid var(--hairline-dark);
  border-left: 2px solid var(--brass);
  background: rgba(255, 255, 255, 0.014);
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.6;
  color: var(--fg-muted);
}
.post-last-checked strong {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--brass);
}

/* Topic index on the Journal index page — small horizontal row of
   filterable categories, no JavaScript, just a scannable line. */
.journal-topic-index {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 24px 0 12px;
  padding: 12px 0;
  border-top: 1px solid var(--hairline-dark);
  border-bottom: 1px solid var(--hairline-dark);
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--brass);
}
.journal-topic-index span { color: rgba(245, 240, 230, 0.6); }
.journal-topic-index .sep { color: var(--brass); opacity: 0.6; }

/* ===========================================================
   FOOTER — mirrored from the home page
   =========================================================== */
.site-footer {
  padding: 72px 32px 32px;
  font-family: var(--font-serif);
  color: var(--fg-muted);
  border-top: 1px solid var(--hairline-dark);
}
.site-footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 64px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--hairline-dark);
}
.site-footer-brand {
  font-family: var(--font-display);
  font-size: 22px;
  color: var(--fg);
  font-variation-settings: "opsz" 36;
}
.site-footer-brand::before {
  content: "";
  width: 15px;
  height: 18px;
  margin-right: 8px;
  display: inline-block;
  vertical-align: -3px;
  background:
    linear-gradient(90deg, transparent 48%, var(--brass) 48%, var(--brass) 52%, transparent 52%),
    linear-gradient(90deg, transparent 7%, var(--brass) 7%, var(--brass) 13%, transparent 13%, transparent 87%, var(--brass) 87%, var(--brass) 93%, transparent 93%);
  border: 1px solid var(--brass);
  opacity: 0.9;
}
.site-footer-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.site-footer-col h4 {
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--brass);
  margin-bottom: 16px;
}
.site-footer-col a {
  display: block;
  margin-bottom: 8px;
  font-size: 15px;
  color: var(--fg-muted);
  transition: color 200ms ease;
}
.site-footer-col a:hover { color: var(--brass-light); }
.site-footer-base {
  max-width: 1200px;
  margin: 32px auto 0;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--fg-muted);
}
@media (max-width: 720px) {
  .site-footer-inner { grid-template-columns: 1fr; }
  .site-footer-cols { grid-template-columns: 1fr 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* Inline calculator callout — embedded mid-article in cover-sizing
   posts. Brass accent, hairline rules, clearly a tool not a banner. */
.post-tool-callout {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 24px;
  align-items: center;
  margin: 2.2em 0;
  padding: 22px 26px;
  border: 1px solid var(--hairline-dark);
  border-left: 2px solid var(--brass);
  background: rgba(255, 255, 255, 0.022);
}
.post-tool-callout-label {
  display: block;
  width: 100%;
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.36em;
  text-transform: uppercase;
  color: var(--brass);
}
.post-tool-callout-body { flex: 1; min-width: 240px; }
.post-tool-callout-body strong {
  display: block;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 500;
  line-height: 1.2;
  color: var(--fg);
  margin-bottom: 4px;
  font-variation-settings: "opsz" 36;
}
.post-tool-callout-body p {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.55;
  color: var(--fg-muted);
  max-width: 50ch;
}
.post-tool-callout-link {
  display: inline-block;
  padding: 12px 18px;
  border: 1px solid var(--brass);
  background: transparent;
  color: var(--brass);
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  transition: background 200ms ease, color 200ms ease;
  white-space: nowrap;
}
.post-tool-callout-link:hover {
  background: var(--brass);
  color: var(--ink);
}