/* ============================================================
   MTRADECRAFT WEBSITE — CANONICAL STYLESHEET (v5)
   ------------------------------------------------------------
   Navy primary, steel accent, hairline borders only.
   Playfair Display headlines, DM Sans body, DM Mono labels.
   ============================================================ */

:root {
  /* Palette */
  --navy: #1e3a5f;
  --navy-deep: #16263f;
  --navy-bg: #eef2f7;
  --steel: #6b7a8f;
  --steel-deep: #4f5d72;
  --steel-bg: #eef0f3;
  --steel-light: #a8b4c4;

  --white: #ffffff;
  --off-white: #f4f5f7;
  --paper: #fafbfc;

  --text-primary: #1a1f29;
  --text-secondary: #3f4856;
  --text-muted: #6b7280;
  --text-faint: #9ba3af;

  --border: #e5e7eb;
  --border-dark: #d1d5db;
  --border-hairline: #eeeff2;

  /* Typography */
  --serif: 'Playfair Display', Georgia, serif;
  --sans: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'DM Mono', 'JetBrains Mono', 'Courier New', monospace;

  /* Spacing scale */
  --container: 1200px;
  --gutter: 2rem;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-secondary);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* ============================================================
   LAYOUT PRIMITIVES
   ============================================================ */

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section {
  padding: 6rem 0;
}

.section-alt {
  background: var(--off-white);
}

.section-dark {
  background: var(--navy-deep);
  color: var(--white);
}

/* ============================================================
   TYPOGRAPHY
   ============================================================ */

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 400;
  color: var(--text-primary);
  line-height: 1.2;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--steel);
  margin-bottom: 1.25rem;
  display: block;
}

.section-dark .eyebrow {
  color: var(--steel-light);
}

.label {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
  letter-spacing: -0.01em;
}

.section-intro {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin-bottom: 4rem;
  line-height: 1.6;
}

.section-dark .section-title,
.section-dark h1,
.section-dark h2,
.section-dark h3 { color: var(--white); }

.section-dark p { color: rgba(255,255,255,0.78); }

/* ============================================================
   NAVIGATION
   ============================================================ */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--border-hairline);
}

.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 1.25rem var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--navy);
  letter-spacing: -0.01em;
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.nav-logo img {
  height: 44px;
  width: auto;
  display: block;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  align-items: center;
  list-style: none;
}

.nav-links a {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-secondary);
  transition: color 0.15s ease;
}

.nav-links a:hover { color: var(--navy); }
.nav-links a.active { color: var(--navy); }

.nav-cta {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.65rem 1.25rem;
  border: 1px solid var(--navy);
  color: var(--navy);
  transition: all 0.15s ease;
}

.nav-cta:hover {
  background: var(--navy);
  color: var(--white);
}

/* ============================================================
   BUTTONS
   ============================================================ */

.btn {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 1rem 1.75rem;
  border: 1px solid var(--navy);
  color: var(--navy);
  background: transparent;
  transition: all 0.15s ease;
  cursor: pointer;
}

.btn:hover {
  background: var(--navy);
  color: var(--white);
}

.btn-primary {
  background: var(--navy);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--navy-deep);
}

.btn-light {
  border-color: var(--white);
  color: var(--white);
}

.btn-light:hover {
  background: var(--white);
  color: var(--navy);
}

/* ============================================================
   HERO
   ============================================================ */

.hero {
  padding: 7rem 0 6rem;
  border-bottom: 1px solid var(--border-hairline);
}

.hero-headline {
  font-size: 3.75rem;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  max-width: 900px;
  margin-bottom: 2rem;
}

.hero-headline em {
  font-style: italic;
  color: var(--steel);
}

.hero-sub {
  font-size: 1.25rem;
  line-height: 1.55;
  color: var(--text-secondary);
  max-width: 640px;
  margin-bottom: 2.5rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}

/* ============================================================
   CTA SECTION (DARK)
   ============================================================ */

.cta {
  background: var(--navy-deep);
  color: var(--white);
  padding: 6rem 0;
}

.cta-heading {
  font-family: var(--serif);
  font-size: 2.5rem;
  line-height: 1.15;
  color: var(--white);
  max-width: 720px;
  margin-bottom: 1.5rem;
}

.cta-heading em {
  font-style: italic;
  color: var(--steel-light);
}

.cta-sub {
  font-size: 1.0625rem;
  color: rgba(255,255,255,0.72);
  max-width: 580px;
  margin-bottom: 2.5rem;
}

/* ============================================================
   FOOTER
   ============================================================ */

.footer {
  background: var(--navy-deep);
  color: rgba(255,255,255,0.65);
  padding: 4rem 0 2rem;
  border-top: 1px solid rgba(255,255,255,0.08);
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand .nav-logo { color: var(--white); }
.footer-brand p {
  margin-top: 1rem;
  font-size: 0.9rem;
  color: rgba(255,255,255,0.55);
  max-width: 320px;
  line-height: 1.6;
}

.footer-col h4 {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--steel-light);
  margin-bottom: 1.25rem;
  font-weight: 400;
}

.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 0.65rem; }
.footer-col a {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.65);
  transition: color 0.15s;
}
.footer-col a:hover { color: var(--white); }

.footer-bottom {
  max-width: var(--container);
  margin: 0 auto;
  padding: 2rem var(--gutter) 0;
  border-top: 1px solid rgba(255,255,255,0.08);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.45);
}

/* ============================================================
   GRIDS & CARDS
   ============================================================ */

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }

.card {
  background: var(--white);
  border: 1px solid var(--border);
  padding: 2.5rem;
}

.card-featured {
  background: var(--white);
  border: 1px solid var(--navy);
  padding: 3rem;
  position: relative;
}

.card-featured::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--navy);
}

.card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.card-price {
  font-family: var(--mono);
  font-size: 1.5rem;
  color: var(--navy);
  margin: 1rem 0 1.5rem;
}

.card-price small {
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.card ul {
  list-style: none;
  margin: 1.5rem 0;
}

.card li {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-hairline);
  font-size: 0.95rem;
  color: var(--text-secondary);
  position: relative;
  padding-left: 1.5rem;
}

.card li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--steel);
}

.card li:last-child { border-bottom: none; }

/* ============================================================
   COMPARISON TABLE (services page / homepage)
   ============================================================ */

.compare-table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  font-size: 0.95rem;
}

.compare-table th {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 400;
  text-align: left;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-dark);
}

.compare-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-hairline);
  color: var(--text-secondary);
}

.compare-table td:first-child { color: var(--text-primary); }
.compare-table td strong { color: var(--text-primary); font-weight: 500; }
.compare-table tr:last-child td { background: var(--steel-bg); }

/* ============================================================
   QUARTERLY CADENCE BLOCK
   ============================================================ */

.cadence { margin-top: 2.5rem; }

.cadence-label {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.cadence-list { list-style: none; border-top: 1px solid var(--border-dark); }

.cadence-list li {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 1rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--border);
  align-items: baseline;
}

.cadence-quarter {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--steel);
  text-transform: uppercase;
}

.cadence-detail {
  font-size: 12.5px;
  color: var(--text-secondary);
  line-height: 1.55;
}

.cadence-detail strong { color: var(--text-primary); font-weight: 500; }

/* ============================================================
   ABOUT PAGE — BIO / DOES & DOESN'T
   ============================================================ */

.bio-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 4rem;
  align-items: start;
}

.bio-photo {
  width: 100%;
}

.bio-photo img {
  width: 100%;
  height: auto;
  display: block;
}

.bio-name {
  font-size: 2.25rem;
  margin-bottom: 0.5rem;
}

.bio-title {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
  margin-bottom: 2rem;
}

.bio-body p {
  font-size: 1.0625rem;
  line-height: 1.65;
  margin-bottom: 1.25rem;
  color: var(--text-secondary);
}

.does-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  margin-top: 2rem;
}

.does-col h3 {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--navy);
  font-weight: 500;
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-dark);
}

.does-col ul { list-style: none; }
.does-col li {
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--border-hairline);
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

/* ============================================================
   RESOURCES INDEX — EDITORIAL POST LIST
   ============================================================ */

.post-list {
  margin-top: 3rem;
  border-top: 1px solid var(--border-dark);
}

.post-list-item {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 2.5rem;
  padding: 2.25rem 0;
  border-bottom: 1px solid var(--border);
  align-items: baseline;
  transition: opacity 0.15s ease;
}

.post-list-item:hover {
  opacity: 0.7;
}

.post-list-date {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
  padding-top: 0.5rem;
}

.post-list-content h3 {
  font-family: var(--serif);
  font-size: 1.5rem;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  font-weight: 400;
}

.post-list-content p {
  font-size: 1rem;
  line-height: 1.55;
  color: var(--text-secondary);
  margin-bottom: 0;
}

.post-list-tag {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-top: 0.75rem;
  display: inline-block;
}

/* ============================================================
   SINGLE POST / ARTICLE
   ============================================================ */

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 720px) 280px;
  gap: 5rem;
  max-width: 1080px;
  margin: 0 auto;
  align-items: start;
}

.article-header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 2.5rem;
  margin-bottom: 3rem;
}

.article-meta {
  display: flex;
  gap: 1.5rem;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
  margin-bottom: 1.5rem;
}

.article-title {
  font-size: 2.5rem;
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.article-dek {
  font-size: 1.125rem;
  line-height: 1.55;
  color: var(--text-secondary);
  font-style: italic;
  max-width: 600px;
}

.article-body {
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--text-secondary);
}

.article-body p {
  margin-bottom: 1.5rem;
}

.article-body h2 {
  font-family: var(--serif);
  font-size: 1.625rem;
  color: var(--text-primary);
  margin: 3rem 0 1.25rem;
  letter-spacing: -0.01em;
  font-weight: 400;
}

.article-body h3 {
  font-family: var(--serif);
  font-size: 1.25rem;
  color: var(--text-primary);
  margin: 2.25rem 0 1rem;
  font-weight: 500;
}

.article-body ul, .article-body ol {
  margin: 1.5rem 0 1.5rem 1.25rem;
  padding-left: 0.75rem;
}

.article-body li {
  margin-bottom: 0.65rem;
}

.article-body blockquote {
  border-left: 2px solid var(--steel);
  padding: 0.25rem 0 0.25rem 1.5rem;
  margin: 2rem 0;
  font-style: italic;
  color: var(--text-primary);
}

.article-body strong {
  color: var(--text-primary);
  font-weight: 500;
}

.article-body a {
  color: var(--navy);
  border-bottom: 1px solid var(--steel);
  transition: border-color 0.15s;
}

.article-body a:hover {
  border-color: var(--navy);
}

.article-sidebar {
  position: sticky;
  top: 100px;
}

.sidebar-card {
  background: var(--off-white);
  border: 1px solid var(--border);
  padding: 1.75rem;
  margin-bottom: 1.5rem;
}

.sidebar-card .label {
  margin-bottom: 0.75rem;
}

.sidebar-card h4 {
  font-family: var(--serif);
  font-size: 1.125rem;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  line-height: 1.3;
  font-weight: 500;
}

.sidebar-card p {
  font-size: 0.875rem;
  line-height: 1.55;
  margin-bottom: 1.25rem;
}

.sidebar-card .btn {
  font-size: 10px;
  padding: 0.65rem 1rem;
  display: block;
  text-align: center;
}

/* Email signup at bottom of article */
.article-signup {
  margin-top: 4rem;
  padding: 3rem;
  background: var(--off-white);
  border: 1px solid var(--border);
}

.article-signup .label {
  margin-bottom: 0.75rem;
}

.article-signup h3 {
  font-family: var(--serif);
  font-size: 1.5rem;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  font-weight: 500;
}

.article-signup p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.signup-form {
  display: flex;
  gap: 0.5rem;
}

.signup-form input {
  flex: 1;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border-dark);
  background: var(--white);
  font-family: var(--sans);
  font-size: 0.95rem;
  color: var(--text-primary);
}

.signup-form input:focus {
  outline: none;
  border-color: var(--navy);
}

.signup-form .btn {
  padding: 0.85rem 1.5rem;
}

/* Article footer / next article */
.article-footer {
  margin-top: 4rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.article-footer a {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.article-footer a:hover { color: var(--navy); }

/* ============================================================
   REGULATIONS PAGE — LONG-FORM REFERENCE LAYOUT
   ============================================================ */

.reg-layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 4rem;
  align-items: start;
}

.reg-toc {
  position: sticky;
  top: 100px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.reg-toc-label {
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.reg-toc ul {
  list-style: none;
}

.reg-toc > ul > li {
  margin-bottom: 1.25rem;
}

.reg-toc > ul > li > a {
  display: block;
  font-weight: 500;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 0.5rem;
  font-size: 10px;
}

.reg-toc ul ul {
  padding-left: 0.5rem;
  border-left: 1px solid var(--border);
}

.reg-toc ul ul li {
  margin: 0.4rem 0;
}

.reg-toc ul ul a {
  color: var(--text-secondary);
  font-size: 10.5px;
  letter-spacing: 0.04em;
  text-transform: none;
  line-height: 1.45;
  display: block;
  padding: 0.25rem 0 0.25rem 0.75rem;
  border-left: 2px solid transparent;
  transition: all 0.15s;
}

.reg-toc ul ul a:hover {
  color: var(--navy);
  border-left-color: var(--steel);
}

.reg-body {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-secondary);
  max-width: 760px;
}

.reg-body > p {
  margin-bottom: 1.25rem;
}

.reg-body strong {
  color: var(--text-primary);
  font-weight: 500;
}

.reg-body a {
  color: var(--navy);
  border-bottom: 1px solid var(--steel);
}

.reg-body a:hover {
  border-color: var(--navy);
}

.reg-part-header {
  margin: 5rem 0 2rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--navy);
}

.reg-part-header:first-of-type {
  margin-top: 3rem;
}

.reg-part-eyebrow {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--steel);
  margin-bottom: 0.5rem;
  display: block;
}

.reg-part-title {
  font-family: var(--serif);
  font-size: 2rem;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  font-weight: 400;
  margin: 0;
}

.reg-rule {
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--border);
}

.reg-rule:last-child {
  border-bottom: none;
}

.reg-rule-name {
  font-family: var(--serif);
  font-size: 1.5rem;
  color: var(--text-primary);
  font-weight: 500;
  margin-bottom: 0.5rem;
  line-height: 1.25;
  scroll-margin-top: 100px;
}

.reg-nist {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
  margin-bottom: 1.75rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-hairline);
}

.reg-rule h4 {
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--navy);
  font-weight: 500;
  margin: 1.75rem 0 0.75rem;
}

.reg-rule p {
  margin-bottom: 1rem;
}

.reg-rule ul, .reg-rule ol {
  margin: 0.75rem 0 1.25rem 1.25rem;
  padding-left: 0.5rem;
}

.reg-rule li {
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
  line-height: 1.65;
}

.reg-rule em {
  color: var(--text-primary);
  font-style: italic;
}

/* Status callout for withdrawn rules, deadlines, etc. */
.reg-callout {
  background: var(--off-white);
  border-left: 3px solid var(--steel);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}

.reg-callout strong {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--navy);
  margin-bottom: 0.5rem;
}

/* Crosswalk table */
.crosswalk-table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  font-size: 0.85rem;
}

.crosswalk-table th {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 400;
  text-align: left;
  padding: 0.75rem 0.65rem;
  border-bottom: 1px solid var(--border-dark);
  background: var(--off-white);
}

.crosswalk-table td {
  padding: 0.85rem 0.65rem;
  border-bottom: 1px solid var(--border-hairline);
  color: var(--text-secondary);
  vertical-align: top;
  line-height: 1.5;
}

.crosswalk-table td:first-child {
  color: var(--text-primary);
  font-weight: 500;
}

.crosswalk-table td:last-child {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--steel);
  letter-spacing: 0.06em;
  white-space: nowrap;
}

/* Reference list section */
.ref-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.5rem 3rem;
  margin-top: 2rem;
}

.ref-col h4 {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--navy);
  font-weight: 500;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.ref-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.ref-col li {
  padding: 0.5rem 0;
  font-size: 0.9rem;
  line-height: 1.5;
}

.ref-col a {
  color: var(--text-secondary);
  border-bottom: none;
}

.ref-col a:hover {
  color: var(--navy);
}

.reg-footer-note {
  margin-top: 4rem;
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  font-style: italic;
  color: var(--text-muted);
  line-height: 1.6;
}

@media (max-width: 900px) {
  .reg-layout { grid-template-columns: 1fr; gap: 2rem; }
  .reg-toc { position: static; }
  .ref-grid { grid-template-columns: 1fr; gap: 2rem; }
  .crosswalk-table { font-size: 0.78rem; }
  .crosswalk-table th,
  .crosswalk-table td { padding: 0.6rem 0.4rem; }
}

@media (max-width: 600px) {
  .section { padding: 4rem 0; }
  .hero { padding: 4rem 0; }
  .hero-headline { font-size: 2rem; }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 1rem; align-items: flex-start; }
}

@media (max-width: 900px) {
  .hero-headline { font-size: 2.5rem; }
  .section-title { font-size: 1.875rem; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; gap: 2rem; }
  .bio-layout { grid-template-columns: 1fr; gap: 2rem; }
  .bio-photo { max-width: 280px; }
  .does-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .nav-links { display: none; }
  .article-layout { grid-template-columns: 1fr; gap: 3rem; }
  .article-sidebar { position: static; }
  .post-list-item { grid-template-columns: 100px 1fr; gap: 1.5rem; }
  .article-title { font-size: 2rem; }
  .signup-form { flex-direction: column; }
}

@media (max-width: 600px) {
  .section { padding: 4rem 0; }
  .hero { padding: 4rem 0; }
  .hero-headline { font-size: 2rem; }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 1rem; align-items: flex-start; }
}

/* ============================================================
   LOGO RESPONSIVE SIZING
   ============================================================ */
.footer-brand .nav-logo img { height: 36px; }

@media (max-width: 600px) {
  .nav-logo img { height: 36px; }
  .footer-brand .nav-logo img { height: 30px; }
}