:root {
  --site-primary: #520049;
  --site-primary-dark: #3b0034;
  --site-primary-soft: #f1def0;
  --site-accent: #8e3c86;
  --site-accent-strong: #4d0045;
  --site-hero-glow: rgba(82, 0, 73, 0.16);
  --site-nav-surface: #2b1630;
  --site-surface: #ffffff;
  --site-surface-muted: #f6f8fb;
  --site-border: rgba(17, 24, 39, 0.1);
  --site-text: #111827;
  --site-text-muted: #4b5563;
  --site-header-black: #020507;
  --site-header-text: rgba(255, 255, 255, 0.92);
  --site-display: "Iowan Old Style", "Book Antiqua", Georgia, serif;
  --site-body: "Avenir Next", "Segoe UI", Helvetica, Arial, sans-serif;
}

html[data-mode="dark"] {
  --site-surface: #0f1720;
  --site-surface-muted: #18222d;
  --site-border: rgba(200, 215, 233, 0.12);
  --site-text: #edf3f9;
  --site-text-muted: #b8c6d6;
  --site-header-black: #010204;
  --site-header-text: rgba(255, 255, 255, 0.84);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--site-body);
  color: var(--site-text);
  background:
    radial-gradient(circle at 10% 10%, var(--site-hero-glow), transparent 28%),
    linear-gradient(180deg, color-mix(in srgb, var(--site-primary-soft) 28%, white) 0%, color-mix(in srgb, var(--site-surface) 86%, #dde7f2) 100%);
}

html[data-mode="dark"] body {
  background:
    radial-gradient(circle at 10% 10%, var(--site-hero-glow), transparent 24%),
    linear-gradient(180deg, #091118 0%, #111a24 100%);
}

body,
button,
input,
select,
textarea {
  font-family: var(--site-body);
}

h1,
h2,
h3,
h4,
h5,
h6,
.rna-title,
.rna-nav-title {
  font-family: var(--site-display);
}

a {
  color: inherit;
}

img {
  max-width: 100%;
}

.rna-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.rna-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
}

.rna-institutional {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  flex-wrap: wrap;
  padding: 8px 24px;
  background: var(--site-header-black);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.rna-institutional-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 10px;
  color: var(--site-header-text);
  text-decoration: none;
  border-radius: 999px;
  font-size: 0.92rem;
}

.rna-institutional-link:hover {
  background: rgba(255, 255, 255, 0.1);
}

.rna-institutional-link img {
  width: 16px;
  height: 16px;
  margin: 0;
}

.rna-main-nav {
  background: color-mix(in srgb, var(--site-surface) 90%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--site-border) 85%, transparent);
  padding: 20px 24px 18px;
}

.rna-main-nav-inner {
  max-width: 1320px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(280px, 360px) 1fr;
  gap: 20px;
  align-items: start;
}

.rna-brand {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.rna-brand-mark {
  width: 62px;
  height: 62px;
  border-radius: 18px;
  background: linear-gradient(155deg, var(--site-primary), var(--site-accent));
  display: grid;
  place-items: center;
  box-shadow: 0 16px 30px color-mix(in srgb, var(--site-hero-glow) 65%, transparent);
  overflow: hidden;
}

.rna-brand-mark img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  margin: 0;
}

.rna-brand-fallback {
  color: white;
  font-weight: 800;
  font-size: 1.12rem;
  letter-spacing: 0.08em;
}

.rna-brand-copy {
  min-width: 0;
}

.rna-kicker {
  margin: 0 0 8px;
  color: var(--site-accent-strong);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.72rem;
  font-weight: 700;
}

.rna-title {
  margin: 0;
  font-size: 1.5rem;
  line-height: 1.1;
}

.rna-paper-line {
  margin: 6px 0 0;
  color: var(--site-text-muted);
  font-size: 0.96rem;
  line-height: 1.5;
}

.rna-nav-group {
  display: grid;
  gap: 14px;
}

.rna-family-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: stretch;
}

.rna-family-pill {
  min-width: 150px;
  padding: 12px 14px;
  border-radius: 16px;
  border: 1px solid color-mix(in srgb, var(--site-border) 90%, transparent);
  background: color-mix(in srgb, var(--site-surface-muted) 86%, transparent);
  text-decoration: none;
}

.rna-family-pill:hover,
.rna-family-pill.is-active {
  background: color-mix(in srgb, var(--site-primary-soft) 86%, white);
  border-color: color-mix(in srgb, var(--site-primary) 38%, var(--site-border));
}

.rna-family-pill strong {
  display: block;
}

.rna-family-pill small {
  color: var(--site-text-muted);
}

.rna-page-row {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.rna-nav-toggle,
.rna-mode-toggle {
  display: none;
  border: 1px solid color-mix(in srgb, var(--site-border) 90%, transparent);
  background: color-mix(in srgb, var(--site-surface) 94%, transparent);
  color: var(--site-text);
  border-radius: 999px;
  padding: 10px 14px;
  cursor: pointer;
}

.rna-page-links {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.rna-page-link,
.rna-page-dropdown > summary {
  list-style: none;
  border: 1px solid color-mix(in srgb, var(--site-border) 90%, transparent);
  color: var(--site-text);
  background: color-mix(in srgb, var(--site-surface) 92%, transparent);
  padding: 10px 14px;
  border-radius: 999px;
  text-decoration: none;
  cursor: pointer;
  font-weight: 600;
}

.rna-page-link.is-active,
.rna-page-link:hover,
.rna-page-dropdown[open] > summary,
.rna-page-dropdown > summary:hover {
  color: white;
  background: linear-gradient(135deg, var(--site-primary), var(--site-accent));
  border-color: transparent;
}

.rna-page-dropdown {
  position: relative;
}

.rna-page-dropdown > summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.rna-page-dropdown > summary::-webkit-details-marker {
  display: none;
}

.rna-page-dropdown-menu {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  min-width: 220px;
  padding: 8px;
  border-radius: 16px;
  border: 1px solid color-mix(in srgb, var(--site-border) 90%, transparent);
  background: color-mix(in srgb, var(--site-surface) 96%, transparent);
  box-shadow: 0 20px 40px rgba(12, 23, 37, 0.16);
  display: grid;
  gap: 4px;
}

.rna-page-dropdown-menu a {
  display: block;
  padding: 10px 12px;
  text-decoration: none;
  border-radius: 10px;
}

.rna-page-dropdown-menu a:hover,
.rna-page-dropdown-menu a.is-active {
  background: color-mix(in srgb, var(--site-primary-soft) 82%, white);
}

.rna-content {
  flex: 1;
  min-width: 0;
}

.rna-content .container-fluid,
.rna-content .wrapper,
.rna-content .well,
.rna-content .sectiontitle {
  max-width: none;
}

.rna-content .wrapper {
  padding-left: 24px;
  padding-right: 24px;
}

.btn-secondary {
  color: #fff;
  background-color: var(--site-primary);
  border-color: var(--site-primary-dark);
}

.btn-secondary:hover,
.btn-secondary:focus,
.btn-secondary:active {
  color: #fff;
  background-color: var(--site-primary-dark);
  border-color: var(--site-primary-dark);
}

.rna-footer {
  margin-top: 48px;
  background: #03070c;
  color: rgba(255, 255, 255, 0.82);
  padding: 28px 24px;
}

.rna-footer-inner {
  max-width: 1320px;
  margin: 0 auto;
  display: grid;
  gap: 10px;
}

.rna-footer-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

.rna-footer-label {
  color: rgba(255, 255, 255, 0.6);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.72rem;
}

.rna-footer a {
  color: rgba(255, 255, 255, 0.9);
}

.rna-main {
  padding-top: 8px;
}

.legacy-page-shell {
  padding: 0;
}

.legacy-entry-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 28px 24px 12px;
}

.legacy-entry-card {
  background: color-mix(in srgb, var(--site-surface) 96%, transparent);
  border: 1px solid color-mix(in srgb, var(--site-border) 90%, transparent);
  border-radius: 24px;
  box-shadow: 0 18px 36px rgba(12, 23, 37, 0.08);
  padding: 24px 28px;
}

.legacy-entry-head {
  margin-bottom: 24px;
  border-bottom: 1px solid color-mix(in srgb, var(--site-border) 85%, transparent);
  padding-bottom: 14px;
}

.legacy-entry-head h1 {
  margin: 0;
}

.legacy-entry-meta {
  margin: 8px 0 0;
  color: var(--site-text-muted);
}

.foldbridge-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.foldbridge-card {
  background: color-mix(in srgb, var(--site-surface) 96%, transparent);
  border: 1px solid color-mix(in srgb, var(--site-border) 90%, transparent);
  border-radius: 22px;
  padding: 22px;
  box-shadow: 0 18px 36px rgba(12, 23, 37, 0.07);
}

.foldbridge-card h3 {
  margin-top: 0;
}

.foldbridge-chip-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 10px 0 0;
}

.foldbridge-chip {
  background: color-mix(in srgb, var(--site-primary-soft) 90%, white);
  color: var(--site-accent-strong);
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 0.84rem;
  font-weight: 600;
}

@media (max-width: 980px) {
  .rna-main-nav-inner {
    grid-template-columns: 1fr;
  }

  .rna-page-row {
    justify-content: space-between;
  }

  .rna-nav-toggle,
  .rna-mode-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .rna-page-links {
    display: none;
    width: 100%;
    padding-top: 8px;
  }

  .rna-page-links.is-open {
    display: flex;
  }

  .rna-page-dropdown {
    width: 100%;
  }

  .rna-page-dropdown-menu {
    position: static;
    min-width: 0;
    margin-top: 8px;
  }
}

@media (max-width: 640px) {
  .rna-main-nav,
  .rna-content .wrapper,
  .rna-footer,
  .legacy-entry-shell {
    padding-left: 16px;
    padding-right: 16px;
  }

  .rna-family-pill {
    min-width: 0;
    width: 100%;
  }

  .legacy-entry-card {
    padding: 20px 18px;
  }
}