/* ==========================================================================
   THREAD & SYSTEM — Stylesheet
   Identity: Aubergine + Cream + Copper (Sage accent)
   Design: Editorial, Academic, Scientific, Responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Root Variables & Tokens
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette */
  --color-aubergine: #34213F;
  --color-plum: #4A2A53;
  --color-plum-light: #5E3969;
  --color-copper: #C9784A;
  --color-copper-dark: #AA5F34;
  --color-copper-light: #F7EDE7;
  --color-copper-border: #E8BCA3;
  --color-sage: #93A88A;
  --color-sage-dark: #6D8264;
  --color-sage-light: #EEF3EC;
  --color-sage-border: #C2D1BC;
  --color-cream: #F6F1E7;
  --color-cream-surface: #FAF7F2;
  --color-cream-muted: #EDE6D8;
  --color-mist: #ECE8EE;
  --color-mist-surface: #F4F1F6;
  --color-graphite: #323238;
  --color-muted: #74727C;
  --color-muted-light: #9B98A3;
  --color-border: #E3DCD2;
  --color-border-subtle: #EDE7DD;
  --color-border-dark: #4A3355;
  --color-white: #FFFFFF;

  /* Typography Stacks */
  --font-serif: "Charter", "Iowan Old Style", "Palatino Linotype", "Palatino", "Baskerville", "Georgia", "Times New Roman", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  /* Layout & Sizing */
  --container-max: 1180px;
  --container-padding: 1.5rem;
  --header-height: 4.5rem;

  /* Shadows (Discreet & Editorial) */
  --shadow-sm: 0 2px 4px rgba(52, 33, 63, 0.04);
  --shadow-md: 0 6px 16px rgba(52, 33, 63, 0.07);
  --shadow-lg: 0 14px 32px rgba(52, 33, 63, 0.09);
  --shadow-card-hover: 0 10px 24px rgba(52, 33, 63, 0.1);

  /* Radii */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --radius-pill: 9999px;

  /* Transitions */
  --transition-fast: 0.18s ease;
  --transition-normal: 0.28s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 0.45s cubic-bezier(0.16, 1, 0.3, 1);
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--color-graphite);
  background-color: var(--color-cream);
  line-height: 1.65;
  font-size: 1rem;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

/* Accessibility: Skip Link */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  z-index: 1000;
  background: var(--color-aubergine);
  color: var(--color-cream);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 1rem;
  outline: 3px solid var(--color-copper);
}

/* Focus styles */
:focus-visible {
  outline: 2px solid var(--color-copper);
  outline-offset: 3px;
}

/* Typography defaults */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  color: var(--color-aubergine);
  line-height: 1.25;
  font-weight: 700;
}

p {
  margin-bottom: 1rem;
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--color-copper-dark);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-copper);
}

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

ul, ol {
  list-style: none;
}

button {
  font-family: inherit;
  font-size: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

/* --------------------------------------------------------------------------
   3. Layout Utilities
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.section {
  padding: 5rem 0;
  position: relative;
}

.section--cream {
  background-color: var(--color-cream);
}

.section--surface {
  background-color: var(--color-cream-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section--mist {
  background-color: var(--color-mist);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section-header {
  margin-bottom: 3.25rem;
  max-width: 760px;
}

.section-header--center {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-copper);
  margin-bottom: 0.75rem;
}

.section-title {
  font-size: 2.25rem;
  letter-spacing: -0.01em;
  margin-bottom: 1rem;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--color-muted);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   4. Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 500;
  background-color: rgba(246, 241, 231, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-fast), box-shadow var(--transition-fast);
}

.site-header.is-scrolled {
  box-shadow: var(--shadow-sm);
  background-color: rgba(246, 241, 231, 0.98);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.header-brand {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.header-logo {
  height: 40px;
  width: auto;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 2.5rem;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-graphite);
  padding: 0.35rem 0;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-copper);
  transition: width var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-aubergine);
}

.nav-link:hover::after {
  width: 100%;
}

.header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-cream);
  background-color: var(--color-aubergine);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-aubergine);
  transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.header-cta:hover {
  background-color: var(--color-plum);
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

/* Mobile Menu Toggle */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 8px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background-color: var(--color-cream-surface);
  cursor: pointer;
  z-index: 600;
}

.mobile-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-aubergine);
  transition: transform var(--transition-normal), opacity var(--transition-fast);
  border-radius: 2px;
}

.mobile-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.mobile-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.mobile-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --------------------------------------------------------------------------
   5. Buttons & Badges
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.2;
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.btn--primary {
  background-color: var(--color-aubergine);
  color: var(--color-cream);
  border: 1px solid var(--color-aubergine);
  box-shadow: var(--shadow-sm);
}

.btn--primary:hover {
  background-color: var(--color-plum);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn--secondary {
  background-color: transparent;
  color: var(--color-aubergine);
  border: 1px solid var(--color-aubergine);
}

.btn--secondary:hover {
  background-color: rgba(52, 33, 63, 0.05);
  color: var(--color-aubergine);
  border-color: var(--color-aubergine);
  transform: translateY(-2px);
}

.btn--sm {
  padding: 0.4rem 0.85rem;
  font-size: 0.8125rem;
  border-radius: var(--radius-sm);
}

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

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

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: center;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-pill);
  background-color: var(--color-mist);
  color: var(--color-aubergine);
  border: 1px solid var(--color-border);
}

.badge--sage {
  background-color: var(--color-sage-light);
  color: var(--color-sage-dark);
  border-color: var(--color-sage-border);
}

.badge--copper {
  background-color: var(--color-copper-light);
  color: var(--color-copper-dark);
  border-color: var(--color-copper-border);
}

/* --------------------------------------------------------------------------
   6. Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  padding: 4.5rem 0 5.5rem;
  background-color: var(--color-cream);
  position: relative;
  overflow: hidden;
}

/* Subtle background architectural lines */
.hero-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  width: 1px;
  height: 100%;
  background: linear-gradient(180deg, var(--color-border-subtle) 0%, transparent 80%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-content {
  max-width: 620px;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--color-copper-dark);
  text-transform: uppercase;
  margin-bottom: 1.25rem;
  padding: 0.35rem 0.85rem;
  background-color: var(--color-copper-light);
  border: 1px solid var(--color-copper-border);
  border-radius: var(--radius-pill);
}

.hero-title {
  font-size: 3rem;
  line-height: 1.18;
  color: var(--color-aubergine);
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.hero-title-highlight {
  color: var(--color-copper);
  display: inline-block;
  position: relative;
}

.hero-title-highlight::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--color-copper-border);
  opacity: 0.5;
  border-radius: 2px;
}

.hero-description {
  font-size: 1.15rem;
  line-height: 1.65;
  color: var(--color-graphite);
  margin-bottom: 2rem;
}

.hero-actions {
  margin-bottom: 1.75rem;
}

.hero-note {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--color-muted);
  font-style: normal;
}

.hero-note::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-sage);
}

/* --------------------------------------------------------------------------
   7. Hero Visual: Connection Map Panel
   -------------------------------------------------------------------------- */
.connection-panel {
  background-color: var(--color-aubergine);
  color: var(--color-cream);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border-dark);
  position: relative;
}

.connection-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(246, 241, 231, 0.12);
  padding-bottom: 1.25rem;
  margin-bottom: 1.75rem;
}

.connection-panel-title {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-cream);
  margin: 0;
}

.connection-panel-status {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--color-sage);
  background-color: rgba(147, 168, 138, 0.15);
  border: 1px solid rgba(147, 168, 138, 0.35);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-pill);
}

/* 4-Node Network Diagram */
.connection-map-diagram {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 1.5rem;
  padding: 1rem 0;
}

/* Cross connection lines */
.connection-map-diagram::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 10%;
  right: 10%;
  height: 1px;
  background: dashed 1px rgba(201, 120, 74, 0.4);
  pointer-events: none;
}

.connection-map-diagram::after {
  content: "";
  position: absolute;
  top: 10%;
  bottom: 10%;
  left: 50%;
  width: 1px;
  background: dashed 1px rgba(147, 168, 138, 0.4);
  pointer-events: none;
}

/* Center Emblem */
.connection-center-emblem {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 52px;
  height: 52px;
  background-color: var(--color-plum);
  border: 2px solid var(--color-copper);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  box-shadow: 0 0 16px rgba(201, 120, 74, 0.3);
}

.connection-center-emblem img {
  width: 28px;
  height: 28px;
}

.connection-node {
  background-color: rgba(74, 42, 83, 0.65);
  border: 1px solid rgba(246, 241, 231, 0.15);
  border-radius: var(--radius-md);
  padding: 1rem;
  position: relative;
  transition: all var(--transition-fast);
  z-index: 5;
}

.connection-node:hover {
  background-color: rgba(74, 42, 83, 0.95);
  border-color: var(--color-copper);
  transform: translateY(-2px);
}

.connection-node-num {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  color: var(--color-copper);
  display: block;
  margin-bottom: 0.25rem;
}

.connection-node-name {
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  color: var(--color-cream);
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.connection-node-desc {
  font-size: 0.75rem;
  color: var(--color-mist);
  opacity: 0.85;
  line-height: 1.4;
  margin: 0;
}

.connection-panel-footer {
  border-top: 1px solid rgba(246, 241, 231, 0.12);
  padding-top: 1.25rem;
  margin-top: 1.5rem;
  text-align: center;
}

.connection-panel-triad {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--color-sage);
  text-transform: uppercase;
}

/* --------------------------------------------------------------------------
   8. Statistics Strip
   -------------------------------------------------------------------------- */
.stats-strip {
  background-color: var(--color-aubergine);
  color: var(--color-cream);
  padding: 3rem 0;
  border-top: 1px solid var(--color-border-dark);
  border-bottom: 1px solid var(--color-border-dark);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  text-align: center;
}

.stat-item {
  padding: 0 1rem;
  position: relative;
}

.stat-item:not(:last-child)::after {
  content: "";
  position: absolute;
  right: 0;
  top: 15%;
  height: 70%;
  width: 1px;
  background-color: rgba(246, 241, 231, 0.15);
}

.stat-value {
  font-family: var(--font-serif);
  font-size: 3rem;
  font-weight: 700;
  line-height: 1;
  color: var(--color-copper);
  margin-bottom: 0.5rem;
}

.stat-label {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--color-mist);
  font-weight: 500;
  line-height: 1.4;
  margin: 0;
}

/* --------------------------------------------------------------------------
   9. Domains Section (#domains)
   -------------------------------------------------------------------------- */
.domains-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem;
}

.domain-card {
  background-color: var(--color-cream-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.domain-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-copper-border);
}

.domain-card-header {
  margin-bottom: 1.25rem;
}

.domain-num {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-copper);
  display: inline-block;
  margin-bottom: 0.5rem;
}

.domain-title {
  font-size: 1.5rem;
  color: var(--color-aubergine);
  margin-bottom: 0.75rem;
}

.domain-desc {
  font-size: 0.95rem;
  color: var(--color-graphite);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.domain-topics {
  border-top: 1px solid var(--color-border-subtle);
  padding-top: 1.25rem;
}

.domain-topics-label {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-muted);
  display: block;
  margin-bottom: 0.5rem;
}

.topic-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.topic-tag {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-aubergine);
  background-color: var(--color-cream);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

/* --------------------------------------------------------------------------
   10. Method Section (#method)
   -------------------------------------------------------------------------- */
.method-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 3rem;
  align-items: start;
}

.method-checklist-card {
  background-color: var(--color-aubergine);
  color: var(--color-cream);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  border: 1px solid var(--color-border-dark);
  box-shadow: var(--shadow-md);
}

.checklist-title {
  font-size: 1.25rem;
  color: var(--color-cream);
  margin-bottom: 0.5rem;
}

.checklist-desc {
  font-size: 0.875rem;
  color: var(--color-mist);
  margin-bottom: 1.5rem;
}

.method-checklist {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  font-size: 0.9375rem;
  line-height: 1.45;
  color: var(--color-cream);
}

.checklist-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: rgba(201, 120, 74, 0.25);
  border: 1px solid var(--color-copper);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-copper-light);
  font-size: 0.75rem;
  font-weight: bold;
  margin-top: 2px;
}

/* 4 Method Steps Cards */
.method-steps {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.method-step-card {
  background-color: var(--color-cream-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.method-step-card:hover {
  border-color: var(--color-copper);
  transform: translateY(-2px);
}

.method-step-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-copper);
  display: block;
  margin-bottom: 0.5rem;
}

.method-step-title {
  font-size: 1.3rem;
  color: var(--color-aubergine);
  margin-bottom: 0.5rem;
}

.method-step-desc {
  font-size: 0.875rem;
  color: var(--color-graphite);
  line-height: 1.55;
  margin: 0;
}

/* --------------------------------------------------------------------------
   11. Researchers Section (#researchers)
   -------------------------------------------------------------------------- */
.researchers-intro-box {
  background-color: var(--color-mist);
  border-left: 3px solid var(--color-copper);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1rem 1.25rem;
  margin-top: 1rem;
  font-size: 0.875rem;
  color: var(--color-graphite);
  line-height: 1.55;
}

.researchers-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.researcher-card {
  background-color: var(--color-cream-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.researcher-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-copper-border);
}

.researcher-card-top {
  margin-bottom: 1.25rem;
}

.researcher-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.researcher-avatar {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-md);
  background-color: var(--color-aubergine);
  color: var(--color-cream);
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  letter-spacing: 0.05em;
  border: 1px solid var(--color-border-dark);
}

.researcher-country {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background-color: var(--color-mist);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.researcher-name {
  font-size: 1.35rem;
  color: var(--color-aubergine);
  margin-bottom: 0.25rem;
}

.researcher-affiliation {
  font-size: 0.8125rem;
  color: var(--color-muted);
  line-height: 1.4;
  margin-bottom: 0.35rem;
}

.researcher-role {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-copper-dark);
  margin-bottom: 0.85rem;
}

.researcher-summary {
  font-size: 0.875rem;
  color: var(--color-graphite);
  line-height: 1.55;
  margin-bottom: 1.25rem;
}

/* Researcher Card Bottom Actions / Tags */
.researcher-card-bottom {
  border-top: 1px solid var(--color-border-subtle);
  padding-top: 1rem;
}

.alias-box {
  background-color: var(--color-mist);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.75rem;
}

.alias-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.35rem;
}

.alias-label {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-muted);
}

.alias-value-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.alias-value {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-aubergine);
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-aubergine);
  background-color: var(--color-cream-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.copy-btn:hover {
  background-color: var(--color-aubergine);
  color: var(--color-cream);
  border-color: var(--color-aubergine);
}

.copy-btn.is-copied {
  background-color: var(--color-sage-dark);
  color: var(--color-white);
  border-color: var(--color-sage-dark);
}

.orcid-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-sage-dark);
  background-color: var(--color-sage-light);
  border: 1px solid var(--color-sage-border);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  display: inline-block;
}

/* --------------------------------------------------------------------------
   12. Reading Section (#reading)
   -------------------------------------------------------------------------- */
.reading-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.reading-card {
  background-color: var(--color-cream-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.reading-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--color-copper-border);
}

.reading-category {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-copper-dark);
  margin-bottom: 0.75rem;
  display: inline-block;
}

.reading-title {
  font-size: 1.35rem;
  color: var(--color-aubergine);
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.reading-desc {
  font-size: 0.875rem;
  color: var(--color-graphite);
  line-height: 1.6;
  margin: 0;
}

/* --------------------------------------------------------------------------
   13. About Section (#about)
   -------------------------------------------------------------------------- */
.about-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: start;
}

.about-lead-text {
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--color-graphite);
}

.principles-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.principle-card {
  background-color: var(--color-cream-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  transition: border-color var(--transition-fast);
}

.principle-card:hover {
  border-color: var(--color-copper);
}

.principle-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-copper);
  display: block;
  margin-bottom: 0.35rem;
}

.principle-title {
  font-size: 1.15rem;
  color: var(--color-aubergine);
  margin-bottom: 0.35rem;
}

.principle-desc {
  font-size: 0.875rem;
  color: var(--color-graphite);
  line-height: 1.55;
  margin: 0;
}

/* --------------------------------------------------------------------------
   14. Disclaimer Notice Box
   -------------------------------------------------------------------------- */
.disclaimer-section {
  padding: 2.5rem 0;
  background-color: var(--color-cream);
}

.disclaimer-box {
  background-color: var(--color-mist);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-aubergine);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.75rem;
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
}

.disclaimer-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  color: var(--color-aubergine);
  margin-top: 2px;
}

.disclaimer-title {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-aubergine);
  margin-bottom: 0.35rem;
}

.disclaimer-text {
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.55;
  margin: 0;
}

/* --------------------------------------------------------------------------
   15. Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: var(--color-aubergine);
  color: var(--color-cream);
  padding: 4rem 0 2.5rem;
  border-top: 1px solid var(--color-border-dark);
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(246, 241, 231, 0.12);
  padding-bottom: 2.5rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
  gap: 2rem;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.footer-mark {
  width: 42px;
  height: 42px;
}

.footer-brand-text h2 {
  font-size: 1.25rem;
  color: var(--color-cream);
  margin-bottom: 0.15rem;
}

.footer-brand-text p {
  font-size: 0.8125rem;
  color: var(--color-sage);
  margin: 0;
}

.footer-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-mist);
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-copper);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8125rem;
  color: var(--color-mist);
  opacity: 0.8;
}

.footer-back-top {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--color-cream);
  font-weight: 600;
  transition: color var(--transition-fast);
}

.footer-back-top:hover {
  color: var(--color-copper);
}

/* --------------------------------------------------------------------------
   16. Progressive Enhancement & Scroll Reveal
   -------------------------------------------------------------------------- */
/* Elements are fully visible by default */
.reveal {
  opacity: 1;
  transform: none;
}

/* Only when JS is actively running, apply subtle reveal animations */
.js-enabled .reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.js-enabled .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* --------------------------------------------------------------------------
   17. Responsive Design (Breakpoints)
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .hero-content {
    max-width: 100%;
  }

  .method-layout,
  .about-layout {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

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

@media (max-width: 768px) {
  :root {
    --header-height: 4rem;
  }

  .section {
    padding: 3.5rem 0;
  }

  .hero-section {
    padding: 3rem 0 4rem;
  }

  .hero-title {
    font-size: 2.25rem;
  }

  .section-title {
    font-size: 1.85rem;
  }

  .mobile-toggle {
    display: flex;
  }

  .header-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background-color: var(--color-cream-surface);
    flex-direction: column;
    align-items: flex-start;
    padding: 2rem var(--container-padding);
    gap: 2rem;
    border-top: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
  }

  .header-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    gap: 1.25rem;
  }

  .nav-link {
    font-size: 1.15rem;
    display: block;
    width: 100%;
    padding: 0.5rem 0;
  }

  .header-cta {
    width: 100%;
    padding: 0.85rem;
    font-size: 1rem;
  }

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

  .stat-item:nth-child(2)::after {
    display: none;
  }

  .domains-grid,
  .method-steps,
  .researchers-grid,
  .reading-grid {
    grid-template-columns: 1fr;
  }

  .footer-top {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.5rem;
  }

  .footer-nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.85rem;
  }

  .btn-group {
    flex-direction: column;
    width: 100%;
  }

  .btn-group .btn {
    width: 100%;
  }

  .stats-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .stat-item::after {
    display: none !important;
  }

  .connection-map-diagram {
    grid-template-columns: 1fr;
  }

  .connection-center-emblem {
    display: none;
  }

  .disclaimer-box {
    flex-direction: column;
    gap: 0.75rem;
  }
}

/* --------------------------------------------------------------------------
   18. Reduced Motion
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .js-enabled .reveal {
    opacity: 1 !important;
    transform: none !important;
  }
}