/* ============================================
   TRAYTO — Commerce Operations Design System
   ============================================
   Visual direction: merchant operations briefing desk,
   specialist editorial journal, catalog control room.
   ============================================ */

/* --- Custom Properties --- */
:root {
  /* Paper & background */
  --color-paper: #F5F0E8;
  --color-paper-warm: #EDE7DA;
  --color-paper-cool: #EAECEE;
  --color-fog: #E8E4DC;
  --color-stone: #D5CFC4;

  /* Text */
  --color-graphite: #2D3436;
  --color-graphite-soft: #4A4E50;
  --color-graphite-muted: #6B7074;
  --color-graphite-light: #8B9196;

  /* Accent: oxidised blue */
  --color-blue: #5B7B8A;
  --color-blue-dark: #3D5A68;
  --color-blue-light: #8FAAB5;
  --color-blue-bg: #EDF2F4;

  /* Accent: copper / rust */
  --color-copper: #C0956C;
  --color-copper-dark: #9A7350;
  --color-rust: #A65D3F;
  --color-copper-bg: #F5EDE4;

  /* Active accent */
  --color-active: #C0573B;
  --color-active-hover: #A84830;

  /* Borders, lines */
  --color-rule: #CCC5B8;
  --color-rule-light: #DDD8CE;
  --color-rule-dark: #A89E90;

  /* System */
  --color-white: #FEFCF8;
  --color-error: #C0392B;
  --color-success: #5B8A5E;

  /* Typography */
  --font-heading: 'Playfair Display', 'Georgia', serif;
  --font-body: 'Inter', 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Consolas', monospace;

  /* Sizing */
  --size-base: 1rem;
  --size-sm: 0.875rem;
  --size-xs: 0.75rem;
  --size-lg: 1.125rem;
  --size-xl: 1.25rem;
  --size-2xl: 1.5rem;
  --size-3xl: 2rem;
  --size-4xl: 2.75rem;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Layout */
  --max-width: 72rem;
  --max-content: 48rem;
  --max-wide: 60rem;
  --border-radius: 3px;
  --border-radius-lg: 6px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

/* --- Reset & Base --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--size-base);
  line-height: 1.7;
  color: var(--color-graphite);
  background-color: var(--color-paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-blue-dark);
  text-decoration-color: var(--color-rule);
  text-underline-offset: 3px;
  transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
}

a:hover {
  color: var(--color-active);
  text-decoration-color: var(--color-active);
}

a:focus-visible {
  outline: 2px solid var(--color-blue);
  outline-offset: 2px;
  border-radius: var(--border-radius);
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-graphite);
}

h1 { font-size: var(--size-4xl); margin-bottom: var(--space-lg); letter-spacing: -0.02em; }
h2 { font-size: var(--size-2xl); margin-top: var(--space-3xl); margin-bottom: var(--space-md); }
h3 { font-size: var(--size-xl); margin-top: var(--space-2xl); margin-bottom: var(--space-sm); }
h4 { font-size: var(--size-lg); margin-top: var(--space-xl); margin-bottom: var(--space-sm); }

p { margin-bottom: var(--space-md); }
ul, ol { margin-bottom: var(--space-md); padding-left: var(--space-xl); }
li { margin-bottom: var(--space-xs); }

blockquote {
  border-left: 3px solid var(--color-copper);
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-xl) 0;
  background: var(--color-copper-bg);
  font-style: italic;
  color: var(--color-graphite-soft);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

code {
  font-family: var(--font-mono);
  font-size: var(--size-sm);
  background: var(--color-fog);
  padding: 0.15em 0.4em;
  border-radius: var(--border-radius);
}

pre {
  background: var(--color-graphite);
  color: var(--color-paper);
  padding: var(--space-lg);
  border-radius: var(--border-radius-lg);
  overflow-x: auto;
  margin: var(--space-xl) 0;
  line-height: 1.5;
}

pre code {
  background: none;
  padding: 0;
  color: inherit;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-xl) 0;
  font-size: var(--size-sm);
}

th, td {
  padding: var(--space-sm) var(--space-md);
  text-align: left;
  border-bottom: 1px solid var(--color-rule-light);
}

th {
  font-weight: 600;
  background: var(--color-fog);
  border-bottom-color: var(--color-rule);
}

tr:hover td {
  background: var(--color-paper-warm);
}

hr {
  border: none;
  border-top: 1px solid var(--color-rule-light);
  margin: var(--space-3xl) 0;
}

/* --- Layout --- */
.site-main {
  min-height: 60vh;
}

.page-wrapper,
.article-wrapper,
.pillar-wrapper,
.case-study-wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
}

.page-body,
.article-body,
.pillar-body,
.case-study-body {
  max-width: var(--max-content);
}

/* --- Header --- */
.site-header {
  background: var(--color-graphite);
  color: var(--color-paper);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 2px solid var(--color-copper);
}

.site-header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-sm) var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
  color: var(--color-paper);
  flex-shrink: 0;
}

.site-logo__text {
  font-family: var(--font-heading);
  font-size: var(--size-xl);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.site-logo:hover .site-logo__text {
  color: var(--color-copper);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.site-nav__primary,
.site-nav__utility {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 0;
  margin: 0;
}

.site-nav__primary a,
.site-nav__utility a,
.site-nav__utility button {
  color: var(--color-paper-cool);
  text-decoration: none;
  font-size: var(--size-sm);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--border-radius);
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
}

.site-nav__primary a:hover,
.site-nav__utility a:hover,
.site-nav__utility button:hover {
  color: var(--color-white);
  background: rgba(255,255,255,0.08);
}

.site-nav__primary a[aria-current="page"] {
  color: var(--color-copper);
  background: rgba(192,149,108,0.12);
}

.site-nav__utility {
  border-left: 1px solid rgba(255,255,255,0.12);
  padding-left: var(--space-md);
}

.search-toggle {
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-body);
}

/* Mobile nav toggle */
.mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  flex-direction: column;
  gap: 4px;
}

.mobile-nav-toggle__bar {
  width: 22px;
  height: 2px;
  background: var(--color-paper);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.mobile-nav-toggle[aria-expanded="true"] .mobile-nav-toggle__bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.mobile-nav-toggle[aria-expanded="true"] .mobile-nav-toggle__bar:nth-child(2) {
  opacity: 0;
}
.mobile-nav-toggle[aria-expanded="true"] .mobile-nav-toggle__bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

@media (max-width: 64rem) {
  .mobile-nav-toggle {
    display: flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-graphite);
    flex-direction: column;
    padding: var(--space-lg);
    border-top: 1px solid rgba(255,255,255,0.08);
    box-shadow: 0 8px 24px rgba(0,0,0,0.3);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav__primary,
  .site-nav__utility {
    flex-direction: column;
    width: 100%;
    gap: 0;
  }

  .site-nav__primary a,
  .site-nav__utility a,
  .site-nav__utility button {
    display: block;
    padding: var(--space-sm) var(--space-md);
    font-size: var(--size-base);
  }

  .site-nav__utility {
    border-left: none;
    border-top: 1px solid rgba(255,255,255,0.08);
    padding-left: 0;
    padding-top: var(--space-md);
    margin-top: var(--space-md);
  }
}

/* --- Search overlay --- */
.search-overlay {
  position: fixed;
  inset: 0;
  background: rgba(45,52,54,0.85);
  z-index: 200;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 10vh;
  backdrop-filter: blur(4px);
}

.search-overlay[hidden] {
  display: none;
}

.search-overlay__inner {
  background: var(--color-white);
  border-radius: var(--border-radius-lg);
  padding: var(--space-xl);
  width: 90%;
  max-width: 40rem;
  box-shadow: 0 16px 48px rgba(0,0,0,0.3);
  position: relative;
}

.search-overlay__close {
  position: absolute;
  top: var(--space-sm);
  right: var(--space-md);
  background: none;
  border: none;
  font-size: var(--size-2xl);
  cursor: pointer;
  color: var(--color-graphite-muted);
  line-height: 1;
}

.search-overlay__close:hover {
  color: var(--color-graphite);
}

/* --- Breadcrumbs --- */
.breadcrumbs {
  padding: var(--space-md) 0;
  margin-bottom: var(--space-md);
}

.breadcrumbs__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  padding: 0;
  font-size: var(--size-sm);
  color: var(--color-graphite-muted);
}

.breadcrumbs__item:not(:last-child)::after {
  content: "›";
  margin-left: var(--space-xs);
  color: var(--color-rule);
}

.breadcrumbs__item a {
  color: var(--color-graphite-muted);
  text-decoration: none;
}

.breadcrumbs__item a:hover {
  color: var(--color-blue-dark);
  text-decoration: underline;
}

/* --- Hero image --- */
.hero-image {
  margin: 0 calc(var(--space-lg) * -1) var(--space-xl);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  background: var(--color-fog);
  aspect-ratio: 16/9;
}

.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* --- Page header --- */
.page-header,
.article-header,
.pillar-header,
.case-study-header {
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-rule-light);
}

.intro-summary {
  font-size: var(--size-lg);
  color: var(--color-graphite-soft);
  line-height: 1.6;
  max-width: var(--max-content);
}

/* --- Article meta --- */
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  font-size: var(--size-sm);
  color: var(--color-graphite-muted);
  margin-top: var(--space-md);
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

/* --- Signal badges --- */
.signal-badge {
  display: inline-block;
  font-size: var(--size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.2em 0.6em;
  border-radius: var(--border-radius);
  line-height: 1.4;
}

.signal-badge--default { background: var(--color-fog); color: var(--color-graphite-soft); }
.signal-badge--topic { background: var(--color-blue-bg); color: var(--color-blue-dark); }
.signal-badge--pillar { background: var(--color-copper-bg); color: var(--color-copper-dark); }
.signal-badge--case-study { background: #E8F0E5; color: var(--color-success); }
.signal-badge--tool { background: #F0ECF5; color: #6C5B8A; }
.signal-badge--new { background: var(--color-active); color: var(--color-white); }

/* --- Pillar TOC --- */
.pillar-toc {
  background: var(--color-paper-warm);
  border: 1px solid var(--color-rule-light);
  border-left: 3px solid var(--color-blue);
  padding: var(--space-lg);
  margin-bottom: var(--space-2xl);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  max-width: var(--max-content);
}

.pillar-toc strong {
  display: block;
  font-size: var(--size-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-graphite-muted);
  margin-bottom: var(--space-sm);
}

.pillar-toc ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-xs) var(--space-lg);
}

.pillar-toc a {
  font-size: var(--size-sm);
  text-decoration: none;
  color: var(--color-blue-dark);
}

.pillar-toc a:hover {
  color: var(--color-active);
  text-decoration: underline;
}

/* --- Methodology box --- */
.methodology-box {
  background: var(--color-blue-bg);
  border: 1px solid var(--color-blue-light);
  border-left: 3px solid var(--color-blue);
  border-radius: 0 var(--border-radius-lg) var(--border-radius-lg) 0;
  padding: var(--space-lg);
  margin: var(--space-2xl) 0;
}

.methodology-box__header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  font-size: var(--size-base);
}

.methodology-box__icon {
  color: var(--color-blue);
  font-size: var(--size-lg);
}

.methodology-box__content {
  font-size: var(--size-sm);
  color: var(--color-graphite-soft);
  line-height: 1.65;
}

.methodology-box__content p:last-child {
  margin-bottom: 0;
}

/* --- Practical block --- */
.practical-block {
  background: var(--color-copper-bg);
  border: 1px solid var(--color-stone);
  border-left: 3px solid var(--color-copper);
  border-radius: 0 var(--border-radius-lg) var(--border-radius-lg) 0;
  padding: var(--space-lg);
  margin: var(--space-2xl) 0;
}

.practical-block__header {
  margin-bottom: var(--space-md);
}

.practical-block__content {
  font-size: var(--size-sm);
  color: var(--color-graphite-soft);
  line-height: 1.65;
}

.practical-block__content p:last-child {
  margin-bottom: 0;
}

/* --- Checklist card --- */
.checklist-card {
  background: var(--color-white);
  border: 1px solid var(--color-rule-light);
  border-radius: var(--border-radius-lg);
  padding: var(--space-lg);
  margin: var(--space-2xl) 0;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.checklist-card__header {
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-rule-light);
}

.checklist-card__content ul {
  list-style: none;
  padding: 0;
}

.checklist-card__content li {
  padding: var(--space-xs) 0;
  padding-left: var(--space-lg);
  position: relative;
  font-size: var(--size-sm);
}

.checklist-card__content li::before {
  content: "☐";
  position: absolute;
  left: 0;
  color: var(--color-blue);
}

/* --- FAQ block --- */
.faq-block {
  margin: var(--space-3xl) 0;
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-rule-light);
}

.faq-block h2 {
  margin-top: 0;
}

.faq-block__list {
  max-width: var(--max-content);
}

.faq-block__item {
  border-bottom: 1px solid var(--color-rule-light);
}

.faq-toggle {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  padding: var(--space-md) 0;
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: var(--size-base);
  font-weight: 600;
  color: var(--color-graphite);
  text-align: left;
  gap: var(--space-md);
}

.faq-toggle:hover {
  color: var(--color-blue-dark);
}

.faq-toggle__icon {
  font-size: var(--size-xl);
  color: var(--color-blue);
  flex-shrink: 0;
  transition: transform var(--transition-base);
}

.faq-toggle[aria-expanded="true"] .faq-toggle__icon {
  transform: rotate(45deg);
}

.faq-block__answer {
  padding: 0 0 var(--space-lg);
  color: var(--color-graphite-soft);
  font-size: var(--size-sm);
  line-height: 1.65;
}

/* --- Related links --- */
.related-links {
  margin-top: var(--space-3xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-rule-light);
}

.related-links__list {
  list-style: none;
  padding: 0;
  display: grid;
  gap: var(--space-md);
}

.related-links__item {
  padding: var(--space-md);
  background: var(--color-paper-warm);
  border-radius: var(--border-radius);
  border-left: 3px solid var(--color-copper);
}

.related-links__item a {
  font-weight: 600;
  text-decoration: none;
}

.related-links__item a:hover {
  text-decoration: underline;
}

.related-links__item p {
  font-size: var(--size-sm);
  color: var(--color-graphite-muted);
  margin: var(--space-xs) 0 0;
}

/* --- Support image --- */
.support-image {
  margin: var(--space-2xl) 0;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  background: var(--color-fog);
}

.support-image img {
  width: 100%;
}

.support-image figcaption {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--size-xs);
  color: var(--color-graphite-muted);
  background: var(--color-paper-warm);
}

/* --- Related grid (pillar pages) --- */
.pillar-related {
  margin-top: var(--space-3xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-rule-light);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-md);
}

.related-card {
  display: block;
  padding: var(--space-lg);
  background: var(--color-white);
  border: 1px solid var(--color-rule-light);
  border-radius: var(--border-radius-lg);
  text-decoration: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.related-card:hover {
  border-color: var(--color-blue);
  box-shadow: 0 2px 8px rgba(91,123,138,0.12);
}

.related-card__title {
  display: block;
  font-weight: 600;
  color: var(--color-graphite);
  margin-bottom: var(--space-xs);
}

.related-card__desc {
  display: block;
  font-size: var(--size-sm);
  color: var(--color-graphite-muted);
}

/* --- Homepage specific --- */
.home-hero {
  padding: var(--space-3xl) 0 var(--space-2xl);
  max-width: var(--max-wide);
}

.home-hero__title {
  font-size: clamp(2rem, 4vw, 3.2rem);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
}

.home-hero__lead {
  font-size: var(--size-lg);
  color: var(--color-graphite-soft);
  max-width: 38rem;
  line-height: 1.6;
}

.home-search {
  margin: var(--space-xl) 0 var(--space-3xl);
  max-width: 36rem;
}

.home-pillars {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-md);
  margin: var(--space-2xl) 0;
}

.pillar-card {
  background: var(--color-white);
  border: 1px solid var(--color-rule-light);
  border-radius: var(--border-radius-lg);
  padding: var(--space-lg);
  text-decoration: none;
  display: block;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.pillar-card:hover {
  border-color: var(--color-blue);
  box-shadow: 0 4px 12px rgba(91,123,138,0.1);
  transform: translateY(-1px);
}

.pillar-card__label {
  display: block;
  font-size: var(--size-xs);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-blue);
  margin-bottom: var(--space-sm);
  font-weight: 600;
}

.pillar-card__title {
  font-family: var(--font-heading);
  font-size: var(--size-lg);
  color: var(--color-graphite);
  margin-bottom: var(--space-sm);
}

.pillar-card__desc {
  font-size: var(--size-sm);
  color: var(--color-graphite-muted);
  line-height: 1.5;
}

/* Process strip */
.process-strip {
  background: var(--color-graphite);
  color: var(--color-paper);
  padding: var(--space-2xl) var(--space-lg);
  margin: var(--space-3xl) calc(var(--space-lg) * -1);
  border-radius: var(--border-radius-lg);
}

.process-strip__inner {
  max-width: var(--max-wide);
  margin: 0 auto;
}

.process-strip__title {
  color: var(--color-copper);
  font-size: var(--size-xl);
  margin-bottom: var(--space-lg);
}

.process-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-md);
  list-style: none;
  padding: 0;
  counter-reset: step;
}

.process-steps li {
  counter-increment: step;
  padding: var(--space-md);
  background: rgba(255,255,255,0.06);
  border-radius: var(--border-radius);
  border-left: 2px solid var(--color-copper);
  font-size: var(--size-sm);
}

.process-steps li::before {
  content: counter(step);
  display: block;
  font-family: var(--font-heading);
  font-size: var(--size-2xl);
  color: var(--color-copper);
  margin-bottom: var(--space-xs);
  font-weight: 700;
}

/* Featured articles grid */
.featured-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-lg);
  margin: var(--space-2xl) 0;
}

.article-card {
  background: var(--color-white);
  border: 1px solid var(--color-rule-light);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.article-card:hover {
  border-color: var(--color-blue);
  box-shadow: 0 4px 12px rgba(91,123,138,0.1);
}

.article-card__image {
  aspect-ratio: 16/9;
  background: var(--color-fog);
  overflow: hidden;
}

.article-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.article-card__body {
  padding: var(--space-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.article-card__tag {
  font-size: var(--size-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-blue);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.article-card__title {
  font-family: var(--font-heading);
  font-size: var(--size-lg);
  color: var(--color-graphite);
  margin-bottom: var(--space-sm);
  line-height: 1.3;
}

.article-card__excerpt {
  font-size: var(--size-sm);
  color: var(--color-graphite-muted);
  line-height: 1.5;
  flex: 1;
}

/* Blog hub */
.blog-hub__filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-rule-light);
}

.filter-btn {
  background: var(--color-paper-warm);
  border: 1px solid var(--color-rule-light);
  border-radius: var(--border-radius);
  padding: var(--space-xs) var(--space-md);
  font-family: var(--font-body);
  font-size: var(--size-sm);
  cursor: pointer;
  color: var(--color-graphite-soft);
  transition: all var(--transition-fast);
}

.filter-btn:hover,
.filter-btn.is-active {
  background: var(--color-blue-bg);
  border-color: var(--color-blue);
  color: var(--color-blue-dark);
}

/* Section headings */
.section-heading {
  font-size: var(--size-xl);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--color-copper);
  display: inline-block;
}

/* Metric ribbon */
.metric-ribbon {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin: var(--space-xl) 0;
  padding: var(--space-lg);
  background: var(--color-paper-warm);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-rule-light);
}

.metric-ribbon__item {
  flex: 1;
  min-width: 140px;
  text-align: center;
}

.metric-ribbon__value {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--size-2xl);
  font-weight: 700;
  color: var(--color-blue-dark);
}

.metric-ribbon__label {
  font-size: var(--size-xs);
  color: var(--color-graphite-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* --- Footer --- */
.site-footer {
  background: var(--color-graphite);
  color: var(--color-paper-cool);
  margin-top: var(--space-4xl);
  border-top: 2px solid var(--color-copper);
}

.site-footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-3xl) var(--space-lg) var(--space-xl);
}

.site-footer__columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.site-footer__heading {
  display: block;
  font-size: var(--size-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-copper);
  margin-bottom: var(--space-md);
}

.site-footer__column ul {
  list-style: none;
  padding: 0;
}

.site-footer__column li {
  margin-bottom: var(--space-xs);
}

.site-footer__column a {
  color: var(--color-paper-cool);
  text-decoration: none;
  font-size: var(--size-sm);
  transition: color var(--transition-fast);
}

.site-footer__column a:hover {
  color: var(--color-white);
}

.site-footer__legal {
  padding-top: var(--space-xl);
  border-top: 1px solid rgba(255,255,255,0.08);
}

.site-footer__legal ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  padding: 0;
  margin-bottom: var(--space-md);
}

.site-footer__legal a {
  color: var(--color-graphite-light);
  text-decoration: none;
  font-size: var(--size-xs);
}

.site-footer__legal a:hover {
  color: var(--color-paper);
}

.site-footer__copy {
  font-size: var(--size-xs);
  color: var(--color-graphite-light);
}

/* --- Tool pages --- */
.tool-layout {
  background: var(--color-white);
  border: 1px solid var(--color-rule-light);
  border-radius: var(--border-radius-lg);
  padding: var(--space-xl);
  margin: var(--space-2xl) 0;
}

.tool-input-group {
  margin-bottom: var(--space-lg);
}

.tool-input-group label {
  display: block;
  font-weight: 600;
  font-size: var(--size-sm);
  margin-bottom: var(--space-xs);
}

.tool-input-group input,
.tool-input-group textarea,
.tool-input-group select {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-rule);
  border-radius: var(--border-radius);
  font-family: var(--font-body);
  font-size: var(--size-base);
  background: var(--color-paper);
}

.tool-input-group input:focus,
.tool-input-group textarea:focus,
.tool-input-group select:focus {
  outline: none;
  border-color: var(--color-blue);
  box-shadow: 0 0 0 3px rgba(91,123,138,0.15);
}

.tool-btn {
  background: var(--color-blue-dark);
  color: var(--color-white);
  border: none;
  padding: var(--space-sm) var(--space-xl);
  border-radius: var(--border-radius);
  font-family: var(--font-body);
  font-size: var(--size-base);
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.tool-btn:hover {
  background: var(--color-active);
}

/* --- Glossary --- */
.glossary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-md);
}

.glossary-chip {
  background: var(--color-white);
  border: 1px solid var(--color-rule-light);
  border-radius: var(--border-radius);
  padding: var(--space-md);
  text-decoration: none;
  transition: border-color var(--transition-fast);
}

.glossary-chip:hover {
  border-color: var(--color-blue);
}

.glossary-chip__term {
  display: block;
  font-weight: 600;
  color: var(--color-graphite);
  margin-bottom: var(--space-xs);
}

.glossary-chip__def {
  font-size: var(--size-sm);
  color: var(--color-graphite-muted);
}

/* --- 404 --- */
.error-page {
  text-align: center;
  padding: var(--space-4xl) var(--space-lg);
  max-width: var(--max-content);
  margin: 0 auto;
}

.error-page__code {
  font-family: var(--font-heading);
  font-size: 8rem;
  color: var(--color-rule);
  line-height: 1;
  margin-bottom: var(--space-md);
}

/* --- Changelog --- */
.changelog-entry {
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--color-rule-light);
}

.changelog-entry__date {
  font-size: var(--size-sm);
  color: var(--color-graphite-muted);
  font-weight: 600;
}

.changelog-entry__title {
  font-size: var(--size-lg);
  margin: var(--space-xs) 0 var(--space-sm);
}

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

.section-alt {
  background: var(--color-paper-warm);
  padding: var(--space-3xl) var(--space-lg);
  margin: var(--space-3xl) calc(var(--space-lg) * -1);
  border-radius: var(--border-radius-lg);
}

.section-fog {
  background: var(--color-paper-cool);
  padding: var(--space-3xl) var(--space-lg);
  margin: var(--space-3xl) calc(var(--space-lg) * -1);
}

.max-content { max-width: var(--max-content); }
.max-wide { max-width: var(--max-wide); }

/* --- Print --- */
@media print {
  .site-header, .site-footer, .search-overlay, .mobile-nav-toggle { display: none; }
  body { background: white; color: black; font-size: 11pt; }
  a { color: black; text-decoration: underline; }
}

/* --- Pagefind overrides --- */
.pagefind-ui {
  --pagefind-ui-scale: 0.9;
  --pagefind-ui-primary: var(--color-blue-dark);
  --pagefind-ui-text: var(--color-graphite);
  --pagefind-ui-background: var(--color-white);
  --pagefind-ui-border: var(--color-rule);
  --pagefind-ui-tag: var(--color-blue-bg);
  --pagefind-ui-border-width: 1px;
  --pagefind-ui-border-radius: var(--border-radius);
  --pagefind-ui-font: var(--font-body);
}

/* =========================================================
   Newsletter widget
   ========================================================= */
.nl-widget {
  background: var(--color-blue-bg);
  border: 1px solid var(--color-rule);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  margin-top: var(--space-2xl);
}

.nl-widget__eyebrow {
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-blue-mid);
  margin: 0 0 var(--space-xs);
}

.nl-widget__heading {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-graphite);
  margin: 0 0 var(--space-sm);
  line-height: 1.25;
}

.nl-widget__body {
  font-size: var(--text-sm);
  color: var(--color-graphite-light);
  margin: 0 0 var(--space-lg);
  line-height: 1.6;
}

.nl-form__honeypot {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.nl-form__field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
  margin-bottom: var(--space-md);
}

.nl-form__label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-graphite);
}

.nl-form__label span { color: var(--color-copper); }

.nl-form__input {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-rule);
  border-radius: var(--border-radius);
  background: var(--color-white);
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-graphite);
  transition: border-color 0.15s;
}

.nl-form__input:focus {
  outline: none;
  border-color: var(--color-blue-mid);
  box-shadow: 0 0 0 3px rgba(91,123,138,0.15);
}

.nl-form__submit {
  width: 100%;
  background: var(--color-copper);
  color: var(--color-white);
  border: none;
  border-radius: var(--border-radius);
  padding: var(--space-sm) var(--space-lg);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, opacity 0.15s;
}

.nl-form__submit:hover { background: #a87a55; }
.nl-form__submit:disabled { opacity: 0.6; cursor: not-allowed; }

.nl-form__note {
  font-size: var(--text-xs);
  color: var(--color-graphite-light);
  margin: var(--space-sm) 0 0;
  text-align: center;
}

.nl-success {
  text-align: center;
  padding: var(--space-lg);
}

.nl-success__icon {
  font-size: 2rem;
  color: var(--color-copper);
  margin-bottom: var(--space-sm);
}

.nl-success__msg {
  font-weight: 600;
  color: var(--color-graphite);
}

.nl-error {
  margin-top: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: #fdf2f2;
  border: 1px solid #f5c6c6;
  border-radius: var(--border-radius);
}

.nl-error__msg {
  font-size: var(--text-sm);
  color: #b91c1c;
  margin: 0;
}

/* Sidebar layout for article and pillar pages */
.page-with-sidebar {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  align-items: start;
}

@media (min-width: 1024px) {
  .page-with-sidebar {
    grid-template-columns: 1fr 320px;
  }
  .page-with-sidebar__sidebar {
    position: sticky;
    top: calc(var(--header-h) + var(--space-lg));
  }
}