/* ============================================================
   Design tokens
   ============================================================ */
:root {
  /* Colors */
  --color-bg:           #f8f7f5;
  --color-surface:      #ffffff;
  --color-nav-bg:       #f1f0ed;
  --color-nav-border:   #e4e2de;
  --color-border:       #e4e2de;
  --color-text:         #18181a;
  --color-text-muted:   #6a6a67;
  --color-text-faint:   #9a9994;
  --color-accent:       #2a9d8f;
  --color-accent-hover: #227f74;
  --color-tag-bg:       #e8f5f3;
  --color-tag-text:     #227f74;
  --color-evidence-bg:  #f0eeea;
  --color-stub-bg:      #fafaf9;

  /* Typography — variable font with static fallback */
  --font: 'Inter var', 'Inter', system-ui, -apple-system, sans-serif;

  /* Spacing scale */
  --sp-1:  4px;
  --sp-2:  8px;
  --sp-3:  12px;
  --sp-4:  16px;
  --sp-5:  20px;
  --sp-6:  24px;
  --sp-8:  32px;
  --sp-10: 40px;
  --sp-12: 48px;
  --sp-16: 64px;

  /* Layout */
  --nav-width:           240px;
  --content-max:         880px;
  --mobile-bar-height:   52px;

  /* Radii */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

@supports (font-variation-settings: normal) {
  body { font-family: 'Inter var', system-ui, sans-serif; }
}

ul { list-style: none; }

a {
  color: var(--color-accent);
  text-decoration: none;
}

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

/* ============================================================
   Layout
   ============================================================ */
.layout {
  display: flex;
  min-height: 100vh;
}

/* ============================================================
   Left nav
   ============================================================ */
.site-nav {
  width: var(--nav-width);
  flex-shrink: 0;
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  background: var(--color-nav-bg);
  border-right: 1px solid var(--color-nav-border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  z-index: 100;
}

.nav-header {
  padding: var(--sp-8) var(--sp-6);
  border-bottom: 1px solid var(--color-nav-border);
}

.nav-brand {
  display: block;
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--color-text);
  text-decoration: none;
  margin-bottom: var(--sp-3);
}

.nav-brand:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.nav-tagline {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.nav-list {
  padding: var(--sp-4) 0;
  flex: 1;
}

.nav-list li + li {
  margin-top: 1px;
}

.nav-link {
  display: block;
  padding: var(--sp-2) var(--sp-6);
  font-size: 0.875rem;
  color: var(--color-text);
  text-decoration: none;
  line-height: 1.4;
  transition: background 0.1s ease, color 0.1s ease;
}

.nav-link:hover {
  background: var(--color-nav-border);
  color: var(--color-text);
  text-decoration: none;
}

.nav-link.is-active {
  font-weight: 500;
  color: var(--color-accent);
  background: var(--color-surface);
}

.nav-group {
  margin-bottom: var(--sp-1);
}

.nav-sublist {
  padding-bottom: var(--sp-2);
}

.nav-sublink {
  display: block;
  padding: var(--sp-1) var(--sp-6) var(--sp-1) calc(var(--sp-6) + 14px);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.1s ease;
}

.nav-sublink:hover {
  color: var(--color-text);
  text-decoration: none;
}

.nav-sublink.is-active {
  color: var(--color-accent);
  font-weight: 500;
}

.nav-footer {
  padding: var(--sp-4) var(--sp-6);
  border-top: 1px solid var(--color-nav-border);
}

.nav-search-link {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--sp-2) 0;
  transition: color 0.1s ease;
}

.nav-search-link:hover {
  color: var(--color-text);
  text-decoration: none;
}

/* ============================================================
   Main content
   ============================================================ */
.main-content {
  margin-left: var(--nav-width);
  flex: 1;
  min-height: 100vh;
}

.content-inner {
  max-width: var(--content-max);
  padding: var(--sp-12) var(--sp-10);
}

/* ============================================================
   Sections
   ============================================================ */
.section {
  margin-bottom: var(--sp-16);
}

.section--header {
  padding-bottom: var(--sp-8);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--sp-10);
}

.page-title {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--color-text-faint);
  margin-bottom: var(--sp-4);
}

.page-thesis {
  font-size: 1.875rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.025em;
  line-height: 1.3;
  margin-bottom: var(--sp-6);
  max-width: 640px;
}

.page-intro {
  font-size: 1rem;
  color: var(--color-text-muted);
  max-width: 560px;
  line-height: 1.65;
}

/* Process strip */
.process-strip {
  display: flex;
  align-items: baseline;
  gap: var(--sp-3);
  flex-wrap: wrap;
  margin-top: var(--sp-6);
  padding-top: var(--sp-5);
  border-top: 1px solid var(--color-border);
}

.process-label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--color-text-faint);
  margin-right: var(--sp-1);
  flex-shrink: 0;
}

.process-step {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.process-arrow {
  font-size: 0.875rem;
  color: var(--color-text-faint);
  flex-shrink: 0;
}

.section-header-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: var(--sp-5);
  gap: var(--sp-4);
}

.section-heading {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--color-text-faint);
  display: block;
  margin-bottom: var(--sp-5);
}

.section-link {
  font-size: 0.8125rem;
  white-space: nowrap;
  color: var(--color-accent);
  text-decoration: none;
  flex-shrink: 0;
}

.section-link:hover {
  text-decoration: underline;
}

.section-intro {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-bottom: var(--sp-5);
}

/* ============================================================
   Browse chips
   ============================================================ */
.section--browse {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  flex-wrap: wrap;
  margin-bottom: var(--sp-12);
}

.browse-label {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  white-space: nowrap;
  flex-shrink: 0;
}

.chip-row {
  display: flex;
  gap: var(--sp-2);
  flex-wrap: wrap;
}

.chip {
  display: inline-block;
  padding: 5px var(--sp-3);
  font-size: 0.8125rem;
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  border-radius: 100px;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.1s ease, color 0.1s ease;
}

.chip:hover {
  background: var(--color-nav-border);
  color: var(--color-text);
  text-decoration: none;
}

/* ============================================================
   Card grid
   ============================================================ */
.card-grid {
  display: grid;
  gap: var(--sp-4);
}

.card-grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

.card-grid--2 {
  grid-template-columns: repeat(2, 1fr);
}

.card-grid--4 {
  grid-template-columns: repeat(4, 1fr);
}

/* Featured hero layout: large left card + two smaller stacked right */
.card-grid--featured {
  grid-template-columns: 3fr 2fr;
  grid-template-rows: auto auto;
}

.card-grid--featured .card--hero {
  grid-row: 1 / 3;
}

/* ============================================================
   Cards
   ============================================================ */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--sp-5);
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.card--compact {
  padding: var(--sp-4);
  gap: var(--sp-2);
}

.card--stub {
  background: var(--color-stub-bg);
  opacity: 0.7;
}

.card--coming-soon {
  background: var(--color-stub-bg);
}

.card-tag {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--color-accent);
}

.card-tag--muted {
  color: var(--color-text-faint);
}

.page-fit {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  max-width: 760px;
  margin-top: var(--sp-5);
}

.card-title {
  font-size: 0.9375rem;
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--color-text);
}

.card--compact .card-title {
  font-size: 0.875rem;
}

.card-body {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.card-evidence {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  background: var(--color-evidence-bg);
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius-sm);
  line-height: 1.5;
}

.card-meta {
  font-size: 0.8125rem;
  color: var(--color-text-faint);
  line-height: 1.5;
}

.card-link {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-accent);
  text-decoration: none;
  margin-top: auto;
}

.card--hero .card-link {
  margin-top: var(--sp-4);
}

.card-link:hover {
  text-decoration: underline;
}

/* ============================================================
   Card modifiers — hero featured card
   ============================================================ */
.card--hero {
  padding: var(--sp-8);
  border-left: 2px solid rgba(42, 157, 143, 0.4);
}

.card--hero .card-title {
  font-size: 1.125rem;
  line-height: 1.35;
}

.card-chart-caption {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: var(--sp-3);
  margin-bottom: calc(-1 * var(--sp-2));
}

.card-chart {
  display: block;
  width: 100%;
}

.card-chart-legend {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: calc(-1 * var(--sp-2));
  margin-bottom: var(--sp-3);
}

.card--featured-sm {
  padding: var(--sp-5);
  gap: var(--sp-3);
}

.card--featured-sm .card-title {
  font-size: 0.875rem;
}

.card--featured-sm .card-body {
  font-size: 0.875rem;
  line-height: 1.65;
}

/* ============================================================
   Resource callout (compact, overview only)
   ============================================================ */
.resource-callout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-6);
  padding: var(--sp-4) var(--sp-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.resource-callout-text {
  display: flex;
  align-items: baseline;
  gap: var(--sp-3);
  flex-wrap: wrap;
  min-width: 0;
}

.resource-callout-title {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  white-space: nowrap;
}

.resource-callout-desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.resource-callout-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-accent);
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
}

.resource-callout-link:hover {
  text-decoration: underline;
  color: var(--color-accent-hover);
}

/* ============================================================
   Card modifiers — case study
   ============================================================ */
.card--case-study {
  gap: var(--sp-3);
}

/* ============================================================
   Card modifiers — method
   ============================================================ */
.card-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-2);
}

.status-badge {
  font-size: 0.625rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  padding: 2px 7px;
  border-radius: 100px;
  white-space: nowrap;
}

.status-badge--tested {
  background: #e5efde;
  color: #2d5a27;
}

.status-badge--dev {
  background: var(--color-tag-bg);
  color: var(--color-text-faint);
}

.card-output {
  margin-top: var(--sp-5);
  padding-top: var(--sp-4);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.8125rem;
  line-height: 1.5;
}

.output-label {
  color: var(--color-text);
  font-weight: 600;
}

/* ============================================================
   Card modifiers — resource
   ============================================================ */
.card--resource {
  background: var(--color-surface);
}

/* ============================================================
   Card modifiers — section nav (overview explore row)
   ============================================================ */
.card--nav {
  background: var(--color-nav-bg);
  border: 1px solid var(--color-nav-border);
  border-radius: var(--radius-lg);
  padding: var(--sp-5);
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  text-decoration: none;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.card--nav:hover {
  border-color: var(--color-accent);
  background: var(--color-surface);
  text-decoration: none;
}

.card-nav-label {
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--color-text);
}

.card-nav-role {
  font-size: 0.75rem;
  color: var(--color-text-faint);
}

.card-nav-desc {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  flex: 1;
}

.card-nav-link {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-accent);
  margin-top: auto;
}

.card--nav:hover .card-nav-link {
  text-decoration: underline;
}

/* ============================================================
   Card secondary body text
   ============================================================ */
.card-body--secondary {
  color: var(--color-text-faint);
  font-size: 0.8125rem;
}

.card-body--faint {
  color: var(--color-text-faint);
}

/* ============================================================
   Card related links
   ============================================================ */
.card-related {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}

.card-related-link {
  font-size: 0.75rem;
  color: var(--color-text-faint);
  text-decoration: none;
}

.card-related-link:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

/* ============================================================
   Cluster note (sparse category)
   ============================================================ */
.cluster-note {
  font-size: 0.8125rem;
  color: var(--color-text-faint);
  margin-top: var(--sp-4);
  line-height: 1.5;
}

.cluster-note a {
  color: var(--color-text-muted);
}

.cluster-note a:hover {
  color: var(--color-accent);
}

/* ============================================================
   In-development items block (resources page)
   ============================================================ */
.dev-items {
  margin-top: var(--sp-6);
  padding: var(--sp-4) var(--sp-5);
  background: var(--color-stub-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.dev-items-label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--color-text-faint);
  margin-bottom: var(--sp-3);
}

.dev-list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.dev-list li {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.dev-list strong {
  font-weight: 500;
  color: var(--color-text);
}

/* ============================================================
   About page
   ============================================================ */
.about-body {
  max-width: 560px;
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
  margin-bottom: var(--sp-8);
}

.about-body p {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text-muted);
}

.about-links {
  display: flex;
  gap: var(--sp-6);
  flex-wrap: wrap;
}

.about-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-accent);
  text-decoration: none;
}

.about-link:hover {
  text-decoration: underline;
  color: var(--color-accent-hover);
}

/* ============================================================
   Clusters
   ============================================================ */
.cluster {
  margin-bottom: var(--sp-10);
}

.cluster:last-child {
  margin-bottom: 0;
}

.cluster-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text-muted);
  padding-bottom: var(--sp-3);
  margin-bottom: var(--sp-4);
  border-bottom: 1px solid var(--color-border);
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--sp-8);
  margin-top: var(--sp-8);
  border-top: 1px solid var(--color-border);
}

.footer-name {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

.footer-nav {
  display: flex;
  gap: var(--sp-6);
}

.footer-nav a {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-decoration: none;
}

.footer-nav a:hover {
  color: var(--color-text);
  text-decoration: none;
}

/* ============================================================
   Mobile header
   ============================================================ */
.mobile-header {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--mobile-bar-height);
  background: var(--color-nav-bg);
  border-bottom: 1px solid var(--color-nav-border);
  z-index: 200;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--sp-4);
}

.mobile-site-name {
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.mobile-menu-btn,
.mobile-search-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--sp-2);
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
}

.mobile-menu-btn:hover,
.mobile-search-btn:hover {
  background: var(--color-nav-border);
}

/* Hamburger icon via CSS */
.hamburger {
  display: block;
  width: 20px;
  height: 2px;
  background: currentColor;
  position: relative;
  transition: background 0.15s ease;
}

.hamburger::before,
.hamburger::after {
  content: '';
  display: block;
  width: 20px;
  height: 2px;
  background: currentColor;
  position: absolute;
  left: 0;
  transition: transform 0.2s ease;
}

.hamburger::before { top: -6px; }
.hamburger::after  { top:  6px; }

/* Open state */
.mobile-menu-btn[aria-expanded="true"] .hamburger {
  background: transparent;
}

.mobile-menu-btn[aria-expanded="true"] .hamburger::before {
  transform: translateY(6px) rotate(45deg);
}

.mobile-menu-btn[aria-expanded="true"] .hamburger::after {
  transform: translateY(-6px) rotate(-45deg);
}

/* Nav backdrop */
.nav-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.25);
  z-index: 90;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.nav-backdrop.is-visible {
  opacity: 1;
}

/* ============================================================
   Case study pages
   ============================================================ */

.section--header .card-tag {
  margin-bottom: var(--sp-4);
}

.cs-meta + .page-intro {
  margin-top: var(--sp-6);
}

.cs-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-4) var(--sp-8);
  margin-top: var(--sp-5);
}

.cs-meta-item {
  display: flex;
  flex-direction: column;
  gap: var(--sp-1);
}

.cs-meta-label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--color-text-faint);
}

.cs-meta-value {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.cs-heading {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.01em;
  margin-bottom: var(--sp-5);
}

.cs-body {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 600px;
}

.cs-body + .cs-body {
  margin-top: var(--sp-4);
}

.cs-steps {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  margin-top: var(--sp-6);
  max-width: 580px;
}

.cs-step {
  display: flex;
  gap: var(--sp-4);
  align-items: flex-start;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

.cs-steps + .cs-body {
  margin-top: var(--sp-5);
}

.cs-step-n {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-evidence-bg);
  color: var(--color-text-muted);
  font-size: 0.6875rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

.cs-step strong {
  color: var(--color-text);
  font-weight: 500;
}

.cs-list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  margin-top: var(--sp-4);
  max-width: 600px;
}

.cs-list li {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  padding-left: var(--sp-4);
  position: relative;
}

.cs-list li::before {
  content: '–';
  position: absolute;
  left: 0;
  color: var(--color-text-faint);
}

.cs-list strong {
  color: var(--color-text);
  font-weight: 500;
}

.cs-key-finding {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-5);
  padding: var(--sp-4) var(--sp-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 2px solid var(--color-accent);
  border-radius: var(--radius-md);
  margin: var(--sp-5) 0;
  max-width: 640px;
}

.cs-key-finding-label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--color-accent);
  white-space: nowrap;
  padding-top: 3px;
  flex-shrink: 0;
}

.cs-key-finding-text {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.5;
}

.cs-finding {
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--color-text);
  border-left: 2px solid var(--color-accent);
  padding: var(--sp-3) var(--sp-5);
  margin: var(--sp-6) 0;
  max-width: 540px;
  line-height: 1.5;
}

.cs-breakdown {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-4);
  margin-top: var(--sp-6);
}

.cs-breakdown--2col {
  grid-template-columns: repeat(2, 1fr);
  margin-top: var(--sp-5);
}

.cs-breakdown-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--sp-5);
}

.cs-breakdown-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--sp-3);
}

.cs-breakdown-list {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.cs-breakdown-list li {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  padding-left: var(--sp-3);
  position: relative;
}

.cs-breakdown-list li::before {
  content: '–';
  position: absolute;
  left: 0;
  color: var(--color-text-faint);
}

.cs-related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--sp-6);
  margin-top: var(--sp-5);
}

.cs-related-item {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.cs-related-type {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--color-accent);
}

.cs-related-title {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text);
}

.cs-related-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-accent);
  text-decoration: none;
}

.cs-related-link:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.cs-related-desc {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

.mp-card {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--sp-5);
}

.mp-card-link {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-accent);
  text-decoration: none;
  margin-top: var(--sp-1);
}

.mp-card-link:hover {
  color: var(--color-accent-hover);
}

/* ============================================================
   Responsive — tablet
   ============================================================ */
@media (max-width: 960px) {
  .card-grid--3,
  .card-grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Featured grid: collapse to equal two-column, hero card no longer spans */
  .card-grid--featured {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto;
  }

  .card-grid--featured .card--hero {
    grid-row: auto;
    grid-column: 1 / -1;
  }

  .content-inner {
    padding: var(--sp-10) var(--sp-8);
  }

  .cs-breakdown {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ============================================================
   Responsive — mobile
   ============================================================ */
@media (max-width: 768px) {
  .mobile-header {
    display: flex;
  }

  .site-nav {
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    top: 0;
    padding-top: var(--mobile-bar-height);
    z-index: 150;
  }

  .site-nav.is-open {
    transform: translateX(0);
  }

  .nav-backdrop {
    display: block;
  }

  .nav-backdrop.is-visible {
    display: block;
  }

  .main-content {
    margin-left: 0;
    padding-top: var(--mobile-bar-height);
  }

  .content-inner {
    padding: var(--sp-8) var(--sp-5);
  }

  .card-grid--featured,
  .card-grid--4,
  .card-grid--3,
  .card-grid--2 {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
  }

  .card-grid--featured .card--hero {
    grid-row: auto;
    grid-column: auto;
  }

  .resource-callout {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--sp-4);
  }

  .process-strip {
    gap: var(--sp-2);
    padding-top: var(--sp-4);
  }

  .section--browse {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--sp-2);
  }

  .chip-row {
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: var(--sp-2);
    width: 100%;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .chip-row::-webkit-scrollbar {
    display: none;
  }

  .page-title {
    font-size: 1.375rem;
  }

  .site-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--sp-4);
  }

  .cs-breakdown,
  .cs-related-grid {
    grid-template-columns: 1fr;
  }
}