/* ==========================================================================
   NICKEL-WIRE.COM — Editorial Intelligence Aesthetic System
   Cream substrate · Fraunces serif · Inter sans · Copper + Sage accents
   Navy ink · Tabular numerals · Drop-cap · Pull-quotes · Reading-shell grid
   ========================================================================== */

/* ------ 0. Design Tokens ------ */
:root {
  /* Palette */
  --bg:          #F5F0E6;
  --bg-elev:     #FBF8F1;
  --bg-deep:     #EDE6D6;
  --ink:         #1A2B3C;
  --ink-soft:    #45556A;
  --ink-faint:   #7A8493;
  /* Formerly copper/amber — replaced site-wide with deep grey */
  --copper:      #3A3F45;
  --copper-deep: #25282C;
  --sage:        #7A8B7A;
  --sage-soft:   #B8C4B5;
  --rule:        #D6CDB8;
  --rule-strong: #B8AC91;

  /* Type */
  --serif: 'Fraunces', 'Libre Baskerville', Georgia, 'Times New Roman', serif;
  --sans:  'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono:  'IBM Plex Mono', 'SF Mono', Menlo, 'Courier New', monospace;

  /* Measure */
  --measure: 680px;
  --shell:   1240px;
  --sidenote: 280px;

  /* Motion */
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* ------ 1. Reset & Base ------ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  font-feature-settings: "kern", "liga", "calt";
}
img { max-width: 100%; height: auto; display: block; }
ul, ol { padding-left: 1.25rem; }
li { margin-bottom: 0.4rem; }
::selection { background: var(--copper); color: var(--bg-elev); }

/* Tabular numerals everywhere — critical for data-dense editorial feel */
.stat-value, .data-value, table, .mono, code, .num, .figure, .pullquote,
th, td, .data, .breadcrumb, .page-meta, time {
  font-feature-settings: "tnum" 1, "kern" 1;
  font-variant-numeric: tabular-nums;
}

/* ------ 2. Links ------ */
a {
  color: var(--copper);
  text-decoration: none;
  background-image: linear-gradient(var(--copper), var(--copper));
  background-repeat: no-repeat;
  background-size: 0% 1px;
  background-position: 0 100%;
  transition: background-size 0.4s var(--ease), color 0.2s ease;
  padding-bottom: 1px;
}
a:hover, a:focus-visible {
  color: var(--copper-deep);
  background-size: 100% 1px;
}
a:focus-visible { outline: 2px solid var(--copper); outline-offset: 3px; border-radius: 1px; }

/* ------ 3. Typography ------ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--serif);
  color: var(--ink);
  font-weight: 500;
  line-height: 1.15;
  letter-spacing: -0.015em;
  font-feature-settings: "kern", "liga", "dlig", "ss01";
}
h1 {
  font-size: clamp(2.4rem, 5.5vw, 4rem);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.022em;
  margin-bottom: 1.5rem;
}
h2 {
  font-size: clamp(1.75rem, 3.4vw, 2.35rem);
  font-weight: 500;
  margin: 3rem 0 1.25rem;
  letter-spacing: -0.018em;
}
h3 {
  font-size: clamp(1.3rem, 2.4vw, 1.55rem);
  font-weight: 600;
  margin: 2.25rem 0 1rem;
  letter-spacing: -0.012em;
}
h4 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 1.75rem 0 0.6rem;
  letter-spacing: -0.005em;
}
p { margin-bottom: 1.15rem; }
strong { color: var(--ink); font-weight: 600; }
em { font-style: italic; }
blockquote { font-family: var(--serif); font-style: italic; color: var(--ink-soft); }
code, .mono, .data-value {
  font-family: var(--mono);
  font-size: 0.93em;
  color: var(--copper-deep);
}

/* Drop-cap on lead paragraphs */
.lead { font-size: 1.12rem; line-height: 1.6; color: var(--ink); }
.lead::first-letter {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 5.6em;
  float: left;
  line-height: 0.85;
  padding: 0.06em 0.08em 0 0;
  margin: 0.04em 0.04em 0 0;
  color: var(--copper);
  font-feature-settings: "ss01";
}

/* Paragraph-in-view emphasis (driven by JS IntersectionObserver) */
.reading-column p, .reading-shell p, article p {
  transition: color 0.8s ease, opacity 0.8s ease;
}
p.passive { color: var(--ink-faint); }
p.active  { color: var(--ink); }

/* ------ 4. Layout Containers ------ */
.container { width: 100%; max-width: var(--shell); margin: 0 auto; padding: 0 1.5rem; }
.reading-column { max-width: var(--measure); margin: 0 auto; padding: 0 1.5rem; }
.wide-column { max-width: 1080px; margin: 0 auto; padding: 0 1.5rem; }
section { padding: 4.5rem 0; }
.section-tight { padding: 3rem 0; }

/* Reading-shell grid: central 680px column with 280px sidenote rail */
.reading-shell {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns:
    [full-start] minmax(1.5rem, 1fr)
    [wide-start] minmax(0, 120px)
    [main-start] minmax(0, var(--measure)) [main-end]
    minmax(0, 40px)
    [side-start] minmax(0, var(--sidenote)) [side-end wide-end]
    minmax(1.5rem, 1fr) [full-end];
  column-gap: 0;
}
.reading-shell > * { grid-column: main-start / main-end; }
.reading-shell > .wide    { grid-column: wide-start / wide-end; }
.reading-shell > .full    { grid-column: full-start / full-end; }
.reading-shell > .sidenote { grid-column: side-start / side-end; }

@media (max-width: 1024px) {
  .reading-shell { display: block; max-width: var(--measure); }
  .reading-shell > .sidenote {
    margin: 1.5rem 0;
    padding: 1.25rem 1.25rem;
    background: var(--bg-elev);
    border-left: 2px solid var(--copper);
  }
}

/* ------ 5. Scroll-progress bar ------ */
#scroll-progress {
  position: fixed; top: 0; left: 0;
  height: 2px; width: 0%;
  background: var(--copper);
  z-index: 2000;
  transition: width 0.08s linear;
  pointer-events: none;
}

/* ------ 6. Header / Navigation ------ */
.site-header {
  position: fixed; top: 0; left: 0; right: 0;
  background-color: rgba(245, 240, 230, 0.88);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid transparent;
  z-index: 1000;
  transition: box-shadow 0.25s ease, border-color 0.25s ease, background-color 0.25s ease;
}
.site-header.scrolled {
  box-shadow: 0 1px 0 var(--rule), 0 4px 20px rgba(26, 43, 60, 0.04);
  border-bottom-color: var(--rule);
  background-color: rgba(245, 240, 230, 0.94);
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  min-height: 72px;
  padding-top: 0.5rem; padding-bottom: 0.5rem;
}
.brand {
  display: flex; flex-direction: column; line-height: 1.1;
  color: var(--ink);
  background: none;
  padding: 0;
}
.brand:hover { color: var(--ink); background: none; }
.brand-wordmark {
  font-family: var(--sans);
  font-weight: 500;
  font-size: 1.15rem;
  letter-spacing: 0.06em;
  color: var(--ink);
  position: relative;
  padding: 0;
}
.brand-wordmark::after { display: none; }
.brand-wordmark em {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  color: var(--copper);
  letter-spacing: -0.01em;
  padding: 0 0.04em;
}
.brand-tagline {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--sage);
  margin-top: 3px;
  font-weight: 400;
}

.main-nav ul { display: flex; list-style: none; padding: 0; margin: 0; gap: 1.85rem; }
.main-nav li { margin: 0; }
.main-nav a {
  font-family: var(--sans);
  font-size: 0.9rem; font-weight: 400; color: var(--ink-soft);
  padding: 0.4rem 0; position: relative;
  letter-spacing: 0.005em;
  background: none;
}
.main-nav a:hover { color: var(--copper); background: none; }
.main-nav a.active, .main-nav a[aria-current="page"] { color: var(--ink); font-weight: 500; }
.main-nav a.active::after, .main-nav a[aria-current="page"]::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 1px; background-color: var(--copper);
}
.nav-toggle {
  display: none; background: none; border: none; cursor: pointer;
  padding: 0.5rem; width: 44px; height: 44px;
  align-items: center; justify-content: center;
}
.nav-toggle span {
  display: block; width: 22px; height: 1.5px;
  background-color: var(--ink); position: relative;
  transition: background 0.2s;
}
.nav-toggle span::before, .nav-toggle span::after {
  content: ""; position: absolute; left: 0;
  width: 22px; height: 1.5px; background-color: var(--ink);
  transition: transform 0.25s ease;
}
.nav-toggle span::before { top: -7px; }
.nav-toggle span::after { top: 7px; }
.nav-toggle.is-open span { background: transparent; }
.nav-toggle.is-open span::before { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span::after  { transform: translateY(-7px) rotate(-45deg); }

/* ------ 7. Hero / Page Hero ------ */
.hero, .page-hero {
  background-color: var(--bg);
  color: var(--ink);
  padding: 9.5rem 0 5rem;
  position: relative;
  border-bottom: 1px solid var(--rule);
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 15% 25%, rgba(58, 63, 69, 0.06) 0%, transparent 55%),
    radial-gradient(ellipse 70% 55% at 85% 75%, rgba(122, 139, 122, 0.08) 0%, transparent 55%);
  pointer-events: none;
}
.hero > .container { position: relative; z-index: 1; }

.hero h1, .page-hero h1 {
  color: var(--ink);
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  line-height: 1.03;
  margin-bottom: 1.5rem;
  letter-spacing: -0.024em;
  max-width: 920px;
}
.hero h1 .line-break { display: block; }
.hero h1 .accent-line { color: var(--copper); font-style: italic; font-weight: 400; }

.hero-sub, .standfirst {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(1.08rem, 1.6vw, 1.3rem);
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 720px;
  margin-bottom: 1.5rem;
}
.hero-body { font-size: 1rem; max-width: 720px; color: var(--ink-soft); margin-bottom: 2.25rem; line-height: 1.65; }
.hero-ctas { display: flex; flex-wrap: wrap; gap: 1rem; margin-bottom: 3.5rem; }
.hero-compact, .page-hero { padding: 8rem 0 3rem; }
.hero-compact h1 { font-size: clamp(2rem, 4.8vw, 3.1rem); margin-bottom: 0.9rem; }
.hero-compact .hero-sub { font-size: 1.1rem; margin-bottom: 0; }

/* Kicker above H1 */
.kicker, .chapter-kicker {
  font-family: var(--mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--copper);
  margin-bottom: 1.15rem;
  font-weight: 400;
}
.chapter-kicker { color: var(--sage); }
.chapter-kicker .num { color: var(--copper); }

/* Page meta strip (byline / volume / reading time) */
.page-meta {
  display: flex; flex-wrap: wrap; gap: 1.5rem 2rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-faint);
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  margin-top: 2rem;
}
.page-meta span strong {
  display: block; color: var(--ink-soft); font-weight: 500;
  margin-bottom: 2px; font-size: 0.72rem; letter-spacing: 0.18em;
}
.page-meta span { color: var(--ink); }

/* ------ 8. Buttons ------ */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 0.85rem 1.6rem;
  font-family: var(--sans);
  font-size: 0.92rem; font-weight: 500; letter-spacing: 0.02em;
  border-radius: 1px; border: 1px solid transparent; cursor: pointer;
  transition: all 0.25s var(--ease); text-decoration: none; line-height: 1.2;
  background-image: none;
}
.btn:hover { background-image: none; }
.btn-primary { background-color: var(--copper); color: var(--bg-elev); border-color: var(--copper); }
.btn-primary:hover { background-color: var(--copper-deep); border-color: var(--copper-deep); color: var(--bg-elev); transform: translateY(-1px); }
.btn-outline-light { background-color: transparent; color: var(--ink); border-color: var(--ink-soft); }
.btn-outline-light:hover { background-color: var(--ink); border-color: var(--ink); color: var(--bg-elev); }
.btn-outline { background-color: transparent; color: var(--copper); border-color: var(--copper); }
.btn-outline:hover { background-color: var(--copper); color: var(--bg-elev); }
.btn-arrow::after { content: " →"; margin-left: 0.4rem; transition: transform 0.25s var(--ease); display: inline-block; }
.btn-arrow:hover::after { transform: translateX(3px); }

/* ------ 9. Stat Bar ------ */
.stat-bar {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 0;
  border-top: 1px solid var(--rule);
  padding-top: 2.5rem;
  margin-top: 1rem;
}
.stat { padding: 0 1.5rem; border-right: 1px solid var(--rule); text-align: left; }
.stat:first-child { padding-left: 0; }
.stat:last-child { border-right: none; padding-right: 0; }
.stat-value {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.85rem, 3.2vw, 2.55rem);
  color: var(--ink);
  line-height: 1.05;
  margin-bottom: 0.5rem;
  letter-spacing: -0.018em;
}
.stat-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--ink-faint);
  font-weight: 400;
}

/* ------ 10. Section helpers ------ */
.section-eyebrow {
  font-family: var(--mono);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--copper);
  margin-bottom: 1rem;
  font-weight: 400;
}
.section-intro { max-width: 760px; margin: 0 auto 3rem; text-align: center; }
.section-intro h2 { margin-top: 0; }
.section-intro p {
  font-size: 1.1rem;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-style: italic;
  line-height: 1.55;
}

hr, .rule {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 4rem auto;
  max-width: 1080px;
}

/* ------ 11. Three-col ------ */
.three-col {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 3rem; max-width: 1080px; margin: 0 auto;
}
.three-col h3 {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 500;
  margin-top: 0;
  margin-bottom: 1rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--rule-strong);
  color: var(--ink);
}
.three-col .col { position: relative; }
.three-col .col::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 32px; height: 1px;
  background: var(--copper);
}
.three-col p { font-size: 0.96rem; line-height: 1.65; color: var(--ink-soft); }

/* ------ 12. App card grid ------ */
.app-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem; max-width: 1200px; margin: 0 auto;
}
.app-card {
  background-color: var(--bg-elev);
  border: 1px solid var(--rule);
  padding: 2rem 1.75rem;
  transition: all 0.3s var(--ease);
  display: flex; flex-direction: column;
  border-top: 2px solid var(--copper);
  position: relative;
}
.app-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 14px 36px rgba(26, 43, 60, 0.07);
  background-color: var(--bg-elev);
  border-top-color: var(--copper-deep);
}
.app-card-icon { width: 40px; height: 40px; margin-bottom: 1.15rem; color: var(--copper); }
.app-card-icon svg { width: 100%; height: 100%; }
.app-card h3 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.3rem;
  margin: 0 0 0.5rem;
  letter-spacing: -0.012em;
}
.app-card-meta {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--sage);
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px dashed var(--rule);
  letter-spacing: 0.04em;
}
.app-card p { font-size: 0.94rem; line-height: 1.6; color: var(--ink-soft); margin-bottom: 1.25rem; flex-grow: 1; }
.app-card-link {
  font-family: var(--sans);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--copper);
  margin-top: auto;
  background: none;
  padding: 0;
}
.app-card-link:hover { color: var(--copper-deep); background: none; }
.app-card-link::after { content: " →"; transition: transform 0.25s var(--ease); display: inline-block; }
.app-card-link:hover::after { transform: translateX(3px); }

/* ------ 13. Tables ------ */
.data-table-wrap, .data-wrap {
  overflow-x: auto;
  margin: 2.25rem 0;
  border: 1px solid var(--rule);
  background-color: var(--bg-elev);
}
table.data-table, table.data {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--sans);
  font-size: 0.92rem;
  font-feature-settings: "tnum" 1;
  font-variant-numeric: tabular-nums;
}
table.data-table caption, table.data caption {
  caption-side: top;
  text-align: left;
  padding: 1rem 1.25rem 0.9rem;
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: 0.95rem;
  color: var(--ink-soft);
  background: var(--bg-elev);
  border-bottom: 1px solid var(--rule);
}
table.data-table caption::before, table.data caption::before {
  content: "Table — ";
  color: var(--copper);
  font-style: italic;
  font-weight: 500;
}
.data-table thead th, table.data thead th {
  background-color: var(--bg-deep);
  color: var(--ink);
  text-align: left;
  padding: 0.9rem 1.25rem;
  font-weight: 500;
  font-family: var(--mono);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border-bottom: 1px solid var(--rule-strong);
}
.data-table tbody td, table.data tbody td {
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
  color: var(--ink);
}
.data-table tbody tr:last-child td, table.data tbody tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover, table.data tbody tr:hover { background-color: var(--bg); }
.data-table td.numeric, table.data td.numeric,
.data-table td .data-value, table.data td .data-value {
  font-family: var(--mono);
  color: var(--copper-deep);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
}

/* ------ 14. Validation grid ------ */
.validation-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem; max-width: 1080px; margin: 2.5rem auto 0;
}
.inst-tile {
  background-color: var(--bg-elev);
  border: 1px solid var(--rule);
  border-left: 2px solid var(--sage);
  padding: 1.5rem 1.35rem;
  transition: border-left-color 0.25s ease, transform 0.25s ease;
}
.inst-tile:hover { border-left-color: var(--copper); transform: translateY(-2px); }
.inst-tile h4 {
  font-family: var(--serif);
  font-size: 1.08rem;
  font-weight: 500;
  margin: 0 0 0.4rem;
  color: var(--ink);
}
.inst-tile .loc {
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--sage);
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}
.inst-tile p { font-size: 0.88rem; line-height: 1.55; color: var(--ink-soft); margin: 0; }

/* ------ 15. Breadcrumb ------ */
.breadcrumb {
  padding: 1.25rem 0 0;
  font-size: 0.82rem;
  color: var(--ink-faint);
  font-family: var(--mono);
}
.breadcrumb ol { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 0.5rem; }
.breadcrumb li { margin: 0; }
.breadcrumb li + li::before { content: "—"; margin-right: 0.5rem; color: var(--rule-strong); }
.breadcrumb a { color: var(--copper); background: none; }
.breadcrumb a:hover { color: var(--copper-deep); }
.breadcrumb [aria-current="page"] { color: var(--ink); }

/* ------ 16. ALKN bridge ------ */
.alkn-bridge {
  max-width: 860px; margin: 2rem auto;
  background: var(--bg-elev);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--copper);
  padding: 2.25rem 2.25rem;
  position: relative;
}
.alkn-bridge::before {
  content: "⬥";
  position: absolute;
  top: 1rem; right: 1.25rem;
  font-size: 0.9rem;
  color: var(--copper);
  opacity: 0.4;
}
.alkn-bridge h3 {
  margin-top: 0;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.4rem;
  color: var(--ink);
}
.alkn-bridge p { font-size: 0.97rem; color: var(--ink-soft); line-height: 1.65; }
.alkn-bridge .compliance-note {
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--ink-faint);
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--rule);
  font-style: normal;
  letter-spacing: 0.02em;
}

/* ------ 17. Property rows ------ */
.property-row {
  display: grid; grid-template-columns: 280px 1fr;
  gap: 2.5rem; padding: 2.25rem 0;
  border-bottom: 1px solid var(--rule);
}
.property-row:last-child { border-bottom: none; }
.property-row h3 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.3rem;
  color: var(--ink);
  letter-spacing: -0.012em;
}
.property-row h3::before {
  content: ""; display: block;
  width: 28px; height: 1px;
  background: var(--copper);
  margin-bottom: 0.75rem;
}
.property-row p { margin: 0; font-size: 0.98rem; line-height: 1.7; color: var(--ink-soft); }

/* ------ 18. Process diagram ------ */
.process-diagram {
  display: flex; align-items: center; justify-content: space-between;
  gap: 0.75rem; flex-wrap: wrap; margin: 2.5rem 0;
}
.process-step {
  flex: 1 1 180px;
  background-color: var(--bg-elev);
  border: 1px solid var(--rule);
  border-top: 2px solid var(--sage);
  padding: 1.25rem 1rem;
  text-align: center;
  position: relative; min-width: 160px;
  transition: border-top-color 0.25s ease;
}
.process-step:hover { border-top-color: var(--copper); }
.process-step-num {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--copper);
  letter-spacing: 0.18em;
  margin-bottom: 0.5rem;
}
.process-step h4 {
  font-family: var(--serif);
  font-size: 1rem;
  margin: 0;
  color: var(--ink);
  font-weight: 500;
}
.process-arrow { color: var(--copper); font-size: 1.25rem; flex: 0 0 auto; }

/* ------ 19. Diameter compare ------ */
.diameter-compare {
  display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: center;
  max-width: 720px; margin: 2.5rem auto; padding: 2rem;
  background-color: var(--bg-elev); border: 1px solid var(--rule);
}
.diameter-visual { text-align: center; }
.diameter-circle {
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, var(--rule-strong) 0%, var(--ink-soft) 70%);
  margin: 0 auto 1rem; box-shadow: inset -3px -3px 8px rgba(26, 43, 60, 0.2);
}
.diameter-circle.big { width: 120px; height: 120px; }
.diameter-circle.small { width: 60px; height: 60px; }
.diameter-visual .label {
  font-family: var(--mono);
  font-size: 0.88rem;
  color: var(--copper);
  font-weight: 500;
}
.diameter-visual .meta { font-size: 0.78rem; color: var(--ink-faint); margin-top: 0.35rem; font-family: var(--mono); }

/* ------ 20. FAQ ------ */
.faq-list { max-width: 820px; margin: 2rem auto 0; }
.faq-item { border-bottom: 1px solid var(--rule); }
.faq-item:first-child { border-top: 1px solid var(--rule); }
.faq-question {
  width: 100%; text-align: left; padding: 1.4rem 0;
  background: none; border: none; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--serif);
  font-size: 1.08rem;
  color: var(--ink);
  font-weight: 500;
  gap: 1rem;
  letter-spacing: -0.01em;
}
.faq-question:hover { color: var(--copper); }
.faq-toggle {
  flex: 0 0 auto; width: 22px; height: 22px;
  position: relative; transition: transform 0.3s var(--ease);
}
.faq-toggle::before, .faq-toggle::after {
  content: ""; position: absolute;
  background-color: var(--copper);
  transition: transform 0.3s var(--ease);
}
.faq-toggle::before { top: 10px; left: 3px; right: 3px; height: 1.5px; }
.faq-toggle::after { top: 3px; bottom: 3px; left: 10px; width: 1.5px; }
.faq-item.is-open .faq-toggle::after { transform: scaleY(0); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s var(--ease); }
.faq-answer-inner { padding: 0 0 1.5rem; color: var(--ink-soft); font-size: 0.98rem; line-height: 1.7; }

/* ------ 21. News / Articles ------ */
.article-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem; max-width: 1200px; margin: 0 auto;
}
.article-card {
  background-color: var(--bg-elev);
  border: 1px solid var(--rule);
  padding: 1.85rem; display: flex; flex-direction: column;
  transition: all 0.3s var(--ease);
}
.article-card:hover {
  border-color: var(--copper);
  box-shadow: 0 10px 28px rgba(26, 43, 60, 0.06);
  transform: translateY(-2px);
}
.article-meta {
  display: flex; gap: 1rem;
  font-family: var(--mono);
  font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.14em;
  color: var(--ink-faint); margin-bottom: 1rem;
}
.article-tag { color: var(--copper); }
.article-card h3 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.3rem;
  margin: 0 0 1rem;
  line-height: 1.3;
  letter-spacing: -0.014em;
}
.article-card p { font-size: 0.94rem; line-height: 1.6; color: var(--ink-soft); margin-bottom: 1.25rem; flex-grow: 1; }

/* ------ 22. Form ------ */
.form-block {
  max-width: 640px; margin: 2.5rem auto 0;
  background-color: var(--bg-elev);
  border: 1px solid var(--rule);
  padding: 2.25rem 2rem;
}
.form-row { margin-bottom: 1.25rem; }
.form-row label {
  display: block; font-size: 0.76rem; font-weight: 500;
  margin-bottom: 0.5rem; color: var(--ink-soft);
  text-transform: uppercase; letter-spacing: 0.12em;
  font-family: var(--mono);
}
.form-row input, .form-row select, .form-row textarea {
  width: 100%; padding: 0.8rem 0.95rem;
  border: 1px solid var(--rule);
  background-color: var(--bg);
  font-family: var(--sans); font-size: 0.97rem; color: var(--ink);
  border-radius: 1px;
  transition: border-color 0.2s, background-color 0.2s, box-shadow 0.2s;
}
.form-row input:focus, .form-row select:focus, .form-row textarea:focus {
  outline: none; border-color: var(--copper);
  background-color: var(--bg-elev);
  box-shadow: 0 0 0 3px rgba(58, 63, 69, 0.12);
}
.form-row textarea { min-height: 140px; resize: vertical; }

/* ------ 23. Footer ------ */
.site-footer {
  background-color: var(--bg-deep);
  color: var(--ink-soft);
  padding: 4rem 0 2rem;
  font-size: 0.9rem;
  border-top: 1px solid var(--rule);
}
.footer-top {
  display: grid; grid-template-columns: 2fr repeat(4, 1fr);
  gap: 2.5rem; padding-bottom: 3rem;
  border-bottom: 1px solid var(--rule-strong);
}
.footer-brand .brand-wordmark { color: var(--ink); font-size: 1.1rem; }
.footer-brand .brand-wordmark::after { display: none; }
.footer-brand .brand-wordmark em { color: var(--copper); }
.footer-brand .brand-tagline { color: var(--sage); margin-top: 5px; }
.footer-brand p { font-size: 0.88rem; line-height: 1.65; margin-top: 1rem; color: var(--ink-soft); font-family: var(--serif); font-style: italic; }
.footer-col h4 {
  font-family: var(--mono);
  font-size: 0.72rem; font-weight: 500; color: var(--ink);
  text-transform: uppercase; letter-spacing: 0.18em; margin: 0 0 1.1rem;
}
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin-bottom: 0.55rem; }
.footer-col a { color: var(--ink-soft); font-size: 0.88rem; background: none; }
.footer-col a:hover { color: var(--copper); background: none; }
.footer-bottom {
  padding-top: 2rem;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
  text-align: center; line-height: 1.65;
}
.footer-bottom a { color: var(--ink-soft); background: none; }
.footer-bottom a:hover { color: var(--copper); background: none; }

/* ------ 24. Pull-quote ------ */
.pullquote {
  margin: 3rem auto;
  max-width: 860px;
  padding: 2.5rem 2rem;
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
  text-align: left;
  position: relative;
}
.pullquote::before {
  content: "“";
  position: absolute;
  top: -0.2rem;
  left: -0.3rem;
  font-family: var(--serif);
  font-size: 6rem;
  color: var(--copper);
  opacity: 0.35;
  line-height: 1;
  font-style: italic;
}
.pullquote blockquote {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(1.35rem, 2.4vw, 1.75rem);
  line-height: 1.35;
  color: var(--ink);
  letter-spacing: -0.012em;
  margin: 0;
  padding-left: 1.5rem;
}
.pullquote blockquote em, .pullquote blockquote strong {
  color: var(--copper);
  font-style: italic;
  font-weight: 400;
}
.pullquote cite {
  display: block;
  margin-top: 1.25rem;
  padding-left: 1.5rem;
  font-family: var(--mono);
  font-style: normal;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--ink-faint);
}
.pullquote cite::before { content: "— "; color: var(--copper); }

/* ------ 25. Figures (charts / diagrams / images) ------ */
.figure, figure.figure {
  margin: 2.75rem 0;
  padding: 1.75rem 1.75rem 1.5rem;
  background-color: var(--bg-elev);
  border: 1px solid var(--rule);
  position: relative;
}
.figure-number {
  font-family: var(--mono);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--copper);
  margin-bottom: 0.4rem;
  font-weight: 500;
}
.figure-title {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.15rem;
  color: var(--ink);
  margin-bottom: 0.35rem;
  letter-spacing: -0.012em;
}
.figure-source {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--rule);
}
.figure-source strong { color: var(--ink-soft); font-weight: 500; }
.figure-body { padding: 0.5rem 0; }
figcaption, .figure-caption {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.92rem;
  color: var(--ink-soft);
  line-height: 1.55;
}
.figure svg, figure.figure svg { display: block; margin: 0 auto; max-width: 100%; height: auto; }

/* Bar charts (pure CSS) */
.bar-row {
  display: grid;
  grid-template-columns: 140px 1fr 80px;
  gap: 1rem;
  align-items: center;
  padding: 0.55rem 0;
  border-bottom: 1px dashed var(--rule);
  font-family: var(--mono);
  font-size: 0.82rem;
}
.bar-row:last-child { border-bottom: none; }
.bar-label { color: var(--ink); font-weight: 500; }
.bar-track {
  background: var(--bg-deep);
  height: 14px;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--rule);
}
.bar-fill {
  height: 100%;
  background-color: var(--copper);
  background-image: repeating-linear-gradient(
    45deg,
    var(--copper) 0 4px,
    var(--copper-deep) 4px 8px
  );
  transition: width 1.2s var(--ease);
}
.bar-fill.sage {
  background-color: var(--sage);
  background-image: repeating-linear-gradient(
    45deg,
    var(--sage) 0 4px,
    #5F7060 4px 8px
  );
}
.bar-value {
  color: var(--copper-deep);
  font-weight: 500;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* SVG diagram defaults: 1.5px ink-navy strokes, copper italic labels, no fills */
svg.diagram { stroke: var(--ink); stroke-width: 1.5; fill: none; }
svg.diagram text { fill: var(--copper); font-family: var(--serif); font-style: italic; font-size: 12px; stroke: none; }
svg.diagram .axis, svg.diagram .grid { stroke: var(--rule-strong); stroke-width: 1; }
svg.diagram .accent { stroke: var(--copper); }

/* Illustration placeholder */
.illustration-placeholder {
  background: var(--bg-elev);
  border: 1px dashed var(--rule-strong);
  padding: 3.5rem 2rem;
  text-align: center;
  margin: 2rem 0;
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--copper);
  position: relative;
}
.illustration-placeholder::before {
  content: "";
  position: absolute; inset: 8px;
  border: 1px solid var(--rule);
  pointer-events: none;
}

/* ------ 26. Sidenote / Further reading ------ */
.sidenote {
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--ink-soft);
}
.sidenote-label {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--copper);
  margin-bottom: 0.5rem;
  display: block;
}

.further-reading {
  background: var(--bg-elev);
  border: 1px solid var(--rule);
  border-left: 2px solid var(--sage);
  padding: 1.5rem 1.5rem;
  margin: 2.5rem 0;
}
.further-reading h4 {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--sage);
  margin: 0 0 1rem;
  font-weight: 500;
}
.further-reading ul { list-style: none; padding: 0; margin: 0; }
.further-reading li {
  padding: 0.5rem 0;
  border-bottom: 1px dashed var(--rule);
  font-family: var(--serif);
  font-size: 0.95rem;
  font-style: italic;
  margin-bottom: 0;
}
.further-reading li:last-child { border-bottom: none; }
.further-reading a { color: var(--ink); background-image: linear-gradient(var(--copper), var(--copper)); }
.further-reading a:hover { color: var(--copper); }

/* ------ 27. Utility ------ */
.bg-white { background-color: var(--bg-elev); }
.bg-offwhite { background-color: var(--bg); }
.bg-navy { background-color: var(--bg-deep); color: var(--ink); }
.bg-navy h1, .bg-navy h2, .bg-navy h3, .bg-navy h4 { color: var(--ink); }
.bg-data { background-color: var(--bg-elev); }
.text-center { text-align: center; }
.text-mono { font-family: var(--mono); }
.mb-0 { margin-bottom: 0 !important; }
.mt-0 { margin-top: 0 !important; }
.mb-sm { margin-bottom: 0.75rem; }
.mb-md { margin-bottom: 1.5rem; }
.mb-lg { margin-bottom: 2.5rem; }

.callout {
  background-color: var(--bg-elev);
  border-left: 3px solid var(--copper);
  padding: 1.5rem 1.75rem; margin: 2rem 0;
  font-size: 0.98rem; line-height: 1.65;
  color: var(--ink-soft);
}
.callout-data { border-left-color: var(--sage); background-color: var(--bg-elev); }
.callout h4 {
  margin-top: 0;
  font-family: var(--serif);
  font-weight: 500;
  color: var(--ink);
  font-size: 1.08rem;
}

.source-note {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-faint);
  font-style: normal;
  margin-top: 1.25rem;
  padding-left: 1rem;
  border-left: 1px solid var(--rule);
  letter-spacing: 0.02em;
}

/* ------ 28. Fade-in ------ */
.fade-in { opacity: 0; transform: translateY(14px); transition: opacity 0.8s var(--ease), transform 0.8s var(--ease); }
.fade-in.is-visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .fade-in { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
  #scroll-progress { transition: none; }
  .bar-fill { transition: none; }
}

/* ------ 29. Responsive ------ */
@media (max-width: 1100px) {
  .three-col { gap: 2.25rem; }
  .main-nav ul { gap: 1.3rem; }
  .main-nav a { font-size: 0.86rem; }
}
@media (max-width: 1024px) {
  .three-col { grid-template-columns: 1fr; gap: 2rem; }
  .validation-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .property-row { grid-template-columns: 1fr; gap: 0.75rem; }
  .stat-bar { grid-template-columns: repeat(2, 1fr); gap: 2rem 0; }
  .stat { border-right: none; padding: 0 1rem; }
  .stat:nth-child(odd) { border-right: 1px solid var(--rule); }
}
@media (max-width: 768px) {
  body { font-size: 16px; }
  section { padding: 3.5rem 0; }
  .main-nav {
    position: fixed; top: 72px; left: 0; right: 0; bottom: 0;
    background-color: var(--bg); transform: translateX(100%);
    transition: transform 0.3s var(--ease);
    padding: 2rem 1.5rem; overflow-y: auto;
    border-top: 1px solid var(--rule);
  }
  .main-nav.is-open { transform: translateX(0); }
  .main-nav ul { flex-direction: column; gap: 0; }
  .main-nav li { border-bottom: 1px solid var(--rule); }
  .main-nav a { display: block; padding: 1rem 0; font-size: 1.05rem; color: var(--ink); }
  .nav-toggle { display: inline-flex; }
  .hero, .page-hero { padding: 7.5rem 0 3.5rem; }
  .hero-ctas { flex-direction: column; align-items: stretch; }
  .hero-ctas .btn { width: 100%; }
  .validation-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  .process-diagram { flex-direction: column; }
  .process-arrow { transform: rotate(90deg); }
  .diameter-compare { grid-template-columns: 1fr; gap: 1.5rem; padding: 1.5rem; }
  .pullquote { padding: 2rem 1rem; margin: 2rem 0; }
  .pullquote::before { font-size: 4rem; }
  .bar-row { grid-template-columns: 1fr; gap: 0.35rem; }
  .bar-row .bar-value { text-align: left; }
  h1 { font-size: 2.1rem; }
  h2 { font-size: 1.65rem; margin: 2.5rem 0 1rem; }
  .lead::first-letter { font-size: 4.2em; padding: 0.04em 0.08em 0 0; }
  .page-meta { gap: 1rem 1.5rem; }
}
@media (max-width: 600px) {
  .stat-bar { grid-template-columns: 1fr; }
  .stat { border-right: none !important; padding: 1rem 0; border-bottom: 1px solid var(--rule); }
  .stat:last-child { border-bottom: none; }
}
@media (max-width: 480px) {
  .container, .reading-column, .wide-column { padding: 0 1rem; }
  .alkn-bridge { padding: 1.5rem 1.25rem; }
  .form-block { padding: 1.5rem 1.25rem; }
  .figure, figure.figure { padding: 1.25rem 1.25rem 1rem; }
}
@media print {
  .site-header, .nav-toggle, .hero-ctas, .site-footer, #scroll-progress { display: none; }
  body { font-size: 11pt; background: #FFF; color: #000; }
  .hero, .page-hero { background: #FFF; color: #000; padding: 2rem 0; border: none; }
  .hero h1, .page-hero h1 { color: #000; }
  .pullquote { border-color: #000; }
  a { color: #000; background: none; }
  .fade-in { opacity: 1; transform: none; }
}