/* ============================================================
   Atlas & Foresight — Core Design System & Styles
   Maps, Meaning, and Adaptive Futures
   ============================================================ */

/* --- Custom Properties / Theme Tokens --- */
:root {
  /* Color Palette */
  --color-forest-ink: #12343B;
  --color-deep-teal: #1E6F74;
  --color-saffron: #F2B134;
  --color-saffron-hover: #DFA026;
  --color-saffron-light: #FFF4DC;
  --color-warm-sand: #F7F3EA;
  --color-warm-sand-light: #FCFAF6;
  --color-mist: #EAF2F2;
  --color-mist-light: #F4F8F8;
  --color-slate-gray: #6F7D86;
  --color-slate-light: #8E9CA5;
  --color-soft-charcoal: #2F3A40;
  --color-white: #FFFFFF;

  /* Editorial & UI Accents */
  --border-subtle: rgba(18, 52, 59, 0.12);
  --border-card: rgba(18, 52, 59, 0.08);
  --border-dark-mode: rgba(234, 242, 242, 0.14);
  --shadow-sm: 0 2px 6px rgba(18, 52, 59, 0.04);
  --shadow-md: 0 8px 24px rgba(18, 52, 59, 0.08);
  --shadow-lg: 0 16px 40px rgba(18, 52, 59, 0.12);
  --shadow-card-hover: 0 14px 32px rgba(18, 52, 59, 0.11);

  /* Typography & Font Stacks */
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-serif: 'Newsreader', Georgia, 'Times New Roman', serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Menlo, Consolas, monospace;

  /* Layout & Sizing */
  --container-max-width: 1180px;
  --container-padding: 1.5rem;
  --header-height: 80px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-pill: 9999px;

  /* Transitions */
  --transition-fast: 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-base: 0.28s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

/* --- Base & Reset --- */
*,
*::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);
  background-color: var(--color-warm-sand);
  color: var(--color-soft-charcoal);
  line-height: 1.65;
  font-weight: 400;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul, ol {
  list-style: none;
}

/* --- Accessibility: Skip Link & Focus States --- */
.skip-to-content {
  position: absolute;
  top: -100px;
  left: 1.5rem;
  background: var(--color-saffron);
  color: var(--color-forest-ink);
  font-weight: 700;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  z-index: 99999;
  box-shadow: var(--shadow-md);
  transition: top var(--transition-fast);
}

.skip-to-content:focus {
  top: 1rem;
  outline: 3px solid var(--color-forest-ink);
}

:focus-visible {
  outline: 3px solid var(--color-saffron);
  outline-offset: 3px;
}

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

.section-spacing {
  padding-top: 5.5rem;
  padding-bottom: 5.5rem;
}

/* --- Typography Utilities --- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-deep-teal);
  margin-bottom: 0.85rem;
}

.eyebrow::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-saffron);
}

.section-title {
  font-size: clamp(2rem, 3.2vw, 2.75rem);
  font-weight: 700;
  color: var(--color-forest-ink);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
}

.section-desc {
  font-size: 1.1rem;
  color: var(--color-slate-gray);
  max-width: 720px;
  line-height: 1.7;
}

.section-header {
  margin-bottom: 3.5rem;
}

.section-header.center {
  text-align: center;
}

.section-header.center .eyebrow {
  justify-content: center;
}

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

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.75rem;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-forest-ink);
  color: var(--color-warm-sand);
  border: 1px solid var(--color-forest-ink);
  box-shadow: 0 4px 14px rgba(18, 52, 59, 0.2);
}

.btn-primary:hover {
  background-color: var(--color-deep-teal);
  border-color: var(--color-deep-teal);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(30, 111, 116, 0.28);
}

.btn-accent {
  background-color: var(--color-saffron);
  color: var(--color-forest-ink);
  border: 1px solid var(--color-saffron);
  font-weight: 700;
  box-shadow: 0 4px 14px rgba(242, 177, 52, 0.28);
}

.btn-accent:hover {
  background-color: var(--color-saffron-hover);
  border-color: var(--color-saffron-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(242, 177, 52, 0.38);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-forest-ink);
  border: 1.5px solid var(--color-forest-ink);
}

.btn-outline:hover {
  background-color: var(--color-forest-ink);
  color: var(--color-warm-sand);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 0.45rem 0.9rem;
  font-size: 0.82rem;
  border-radius: var(--radius-sm);
}

/* ============================================================
   Header & Navigation
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(247, 243, 234, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.site-header.scrolled {
  background-color: rgba(255, 255, 255, 0.96);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  gap: 1.5rem;
}

.header-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  text-decoration: none;
}

.header-logo img {
  height: 48px;
  width: auto;
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.85rem;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--color-soft-charcoal);
  position: relative;
  padding: 0.4rem 0;
  transition: color var(--transition-fast);
}

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

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

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

.header-action {
  display: flex;
  align-items: center;
}

/* Hamburger Button */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background-color: var(--color-mist);
  border: 1px solid var(--border-subtle);
  gap: 5px;
  cursor: pointer;
  z-index: 1100;
}

.menu-toggle-line {
  width: 20px;
  height: 2px;
  background-color: var(--color-forest-ink);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
  transform-origin: center;
}

.menu-toggle[aria-expanded="true"] .line-top {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .line-mid {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] .line-bot {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Navigation Drawer */
.mobile-nav-drawer {
  display: none;
}

/* ============================================================
   Hero Section
   ============================================================ */
.hero-section {
  position: relative;
  padding-top: 4.5rem;
  padding-bottom: 5.5rem;
  background-color: var(--color-warm-sand);
  background-image: 
    radial-gradient(circle at 10% 20%, rgba(30, 111, 116, 0.05) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(242, 177, 52, 0.08) 0%, transparent 50%),
    linear-gradient(to right, rgba(18, 52, 59, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(18, 52, 59, 0.03) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 48px 48px, 48px 48px;
  border-bottom: 1px solid var(--border-subtle);
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.95fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-eyebrow {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--color-deep-teal);
  text-transform: uppercase;
  margin-bottom: 1.25rem;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  background: var(--color-mist);
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(30, 111, 116, 0.18);
}

.hero-title {
  font-size: clamp(2.25rem, 3.8vw, 3.4rem);
  font-weight: 800;
  color: var(--color-forest-ink);
  line-height: 1.18;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.hero-highlight {
  color: var(--color-deep-teal);
  position: relative;
  display: inline;
  background: linear-gradient(120deg, rgba(242, 177, 52, 0.22) 0%, rgba(242, 177, 52, 0.38) 100%);
  background-repeat: no-repeat;
  background-size: 100% 35%;
  background-position: 0 88%;
}

.hero-description {
  font-size: 1.15rem;
  color: var(--color-soft-charcoal);
  line-height: 1.75;
  margin-bottom: 2.25rem;
  max-width: 580px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
}

.hero-note {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-slate-gray);
  letter-spacing: 0.02em;
}

.hero-note-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-saffron);
  box-shadow: 0 0 0 3px rgba(242, 177, 52, 0.3);
}

/* Hero Right: Exploration / Atlas / System Map Panel */
.hero-visual {
  width: 100%;
}

.system-map-panel {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(18, 52, 59, 0.12);
  box-shadow: var(--shadow-lg);
  padding: 1.75rem;
  position: relative;
  overflow: hidden;
}

.system-map-panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-deep-teal), var(--color-saffron));
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 1.25rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-card);
}

.panel-title-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.panel-mark-icon {
  width: 28px;
  height: 28px;
  border-radius: 6px;
}

.panel-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-forest-ink);
  letter-spacing: 0.02em;
}

.panel-badge {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-forest-ink);
  background-color: var(--color-saffron-light);
  border: 1px solid rgba(242, 177, 52, 0.4);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-pill);
}

/* 4 Interactive Framework Steps */
.framework-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
  position: relative;
}

.framework-step-card {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 0.9rem 1rem;
  background-color: var(--color-warm-sand-light);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
}

.framework-step-card:hover {
  background-color: var(--color-mist-light);
  border-color: rgba(30, 111, 116, 0.25);
  transform: translateX(4px);
}

.step-number {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-deep-teal);
  background: var(--color-mist);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(30, 111, 116, 0.2);
  flex-shrink: 0;
}

.step-info {
  display: flex;
  flex-direction: column;
}

.step-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-forest-ink);
  margin-bottom: 0.15rem;
}

.step-desc {
  font-size: 0.84rem;
  color: var(--color-slate-gray);
  line-height: 1.4;
}

.panel-footer {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px dashed rgba(18, 52, 59, 0.15);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-deep-teal);
  letter-spacing: 0.04em;
}

.panel-flow-text {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-soft-charcoal);
}

.panel-flow-text span {
  color: var(--color-saffron-hover);
  font-weight: 700;
}

/* ============================================================
   Statistics Bar
   ============================================================ */
.stats-section {
  background-color: var(--color-forest-ink);
  color: var(--color-warm-sand);
  padding: 2.75rem 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

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

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
  padding: 0 1rem;
}

.stat-item:not(:last-child)::after {
  content: "";
  position: absolute;
  right: -1rem;
  top: 15%;
  height: 70%;
  width: 1px;
  background-color: rgba(234, 242, 242, 0.15);
}

.stat-value {
  font-size: clamp(2.2rem, 3.2vw, 3rem);
  font-weight: 800;
  color: var(--color-saffron);
  line-height: 1.1;
  margin-bottom: 0.35rem;
  letter-spacing: -0.02em;
}

.stat-label {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-mist);
  letter-spacing: 0.02em;
  text-transform: lowercase;
}

/* ============================================================
   Themes Section (#themes)
   ============================================================ */
.themes-section {
  background-color: var(--color-warm-sand);
}

.themes-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem;
}

.theme-card {
  background-color: var(--color-white);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-base);
  position: relative;
}

.theme-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-card-hover);
  border-color: rgba(30, 111, 116, 0.28);
}

.theme-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.theme-index {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-saffron);
}

.theme-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-mist);
  border: 2px solid var(--color-deep-teal);
}

.theme-title {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--color-forest-ink);
  line-height: 1.25;
  margin-bottom: 0.85rem;
}

.theme-text {
  font-size: 0.98rem;
  color: var(--color-soft-charcoal);
  line-height: 1.65;
  margin-bottom: 1.75rem;
  flex-grow: 1;
}

.theme-topics-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-slate-gray);
  margin-bottom: 0.65rem;
}

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

.theme-tag {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-forest-ink);
  background-color: var(--color-mist);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(30, 111, 116, 0.12);
}

/* ============================================================
   Method Section (#method)
   ============================================================ */
.method-section {
  background-color: var(--color-mist);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.method-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 3.5rem;
  align-items: flex-start;
}

.method-overview {
  display: flex;
  flex-direction: column;
}

.method-checklist-title {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-deep-teal);
  margin-top: 1.5rem;
  margin-bottom: 1rem;
}

.method-checklist {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.checklist-item {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  font-size: 0.96rem;
  font-weight: 600;
  color: var(--color-forest-ink);
}

.checklist-icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background-color: var(--color-deep-teal);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  flex-shrink: 0;
}

.method-cards-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

.method-step-card {
  background-color: var(--color-white);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
}

.method-step-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: rgba(30, 111, 116, 0.25);
}

.method-step-num {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-saffron);
  margin-bottom: 0.5rem;
}

.method-step-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-forest-ink);
  margin-bottom: 0.65rem;
}

.method-step-desc {
  font-size: 0.9rem;
  color: var(--color-soft-charcoal);
  line-height: 1.55;
}

/* ============================================================
   Researchers Section (#researchers)
   ============================================================ */
.researchers-section {
  background-color: var(--color-warm-sand);
}

.researchers-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.researcher-card {
  background-color: var(--color-white);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-base);
  position: relative;
}

.researcher-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: rgba(30, 111, 116, 0.25);
}

.researcher-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.researcher-avatar {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-forest-ink), var(--color-deep-teal));
  color: var(--color-warm-sand);
  font-weight: 700;
  font-size: 1.15rem;
  display: flex;
  align-items: center;
  justify-content: center;
  letter-spacing: 0.05em;
  box-shadow: 0 4px 10px rgba(18, 52, 59, 0.15);
}

.researcher-country {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-slate-gray);
  background-color: var(--color-warm-sand);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(18, 52, 59, 0.08);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.researcher-name {
  font-size: 1.22rem;
  font-weight: 700;
  color: var(--color-forest-ink);
  line-height: 1.25;
  margin-bottom: 0.35rem;
}

.researcher-institution {
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--color-deep-teal);
  line-height: 1.45;
  margin-bottom: 0.95rem;
  min-height: 2.8em;
}

.researcher-summary {
  font-size: 0.88rem;
  color: var(--color-soft-charcoal);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

/* Researcher Metadata & Alias Box */
.researcher-meta {
  padding-top: 1rem;
  border-top: 1px solid var(--border-card);
  margin-top: auto;
}

.researcher-orcid {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--color-slate-gray);
  margin-bottom: 0.75rem;
}

.researcher-orcid::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: #a6ce39; /* ORCID green accent */
}

.alias-box {
  background-color: var(--color-mist);
  border: 1px solid rgba(30, 111, 116, 0.15);
  border-radius: var(--radius-md);
  padding: 0.75rem 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.alias-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-deep-teal);
}

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

.alias-address {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-forest-ink);
  word-break: break-all;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background-color: var(--color-white);
  color: var(--color-forest-ink);
  border: 1px solid rgba(18, 52, 59, 0.18);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.copy-btn:hover {
  background-color: var(--color-forest-ink);
  color: var(--color-warm-sand);
  border-color: var(--color-forest-ink);
}

.copy-btn.copied {
  background-color: var(--color-deep-teal);
  color: var(--color-white);
  border-color: var(--color-deep-teal);
}

.researcher-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag-badge {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-deep-teal);
  background-color: var(--color-mist);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(30, 111, 116, 0.15);
}

/* ============================================================
   Library Section (#library)
   ============================================================ */
.library-section {
  background-color: var(--color-warm-sand-light);
  border-top: 1px solid var(--border-subtle);
}

.library-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.library-card {
  background-color: var(--color-white);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-base);
}

.library-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: rgba(30, 111, 116, 0.25);
}

.library-category {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-deep-teal);
  margin-bottom: 0.85rem;
}

.library-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-forest-ink);
  line-height: 1.3;
  margin-bottom: 0.85rem;
}

.library-desc {
  font-size: 0.92rem;
  color: var(--color-soft-charcoal);
  line-height: 1.6;
}

/* ============================================================
   About Section (#about) & Principles
   ============================================================ */
.about-section {
  background-color: var(--color-warm-sand);
}

.about-intro-grid {
  display: grid;
  grid-template-columns: 1fr;
  max-width: 860px;
  margin-bottom: 3.5rem;
}

.about-statement {
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--color-forest-ink);
  line-height: 1.7;
}

.principles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
  margin-bottom: 4rem;
}

.principle-card {
  background-color: var(--color-white);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 2.25rem 2rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.principle-num {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-saffron);
  margin-bottom: 1rem;
}

.principle-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-forest-ink);
  margin-bottom: 0.85rem;
  line-height: 1.25;
}

.principle-text {
  font-size: 0.95rem;
  color: var(--color-soft-charcoal);
  line-height: 1.65;
}

/* Reference Notice / Disclaimer Box */
.reference-notice-box {
  background-color: var(--color-mist);
  border-left: 4px solid var(--color-deep-teal);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 1.5rem 1.75rem;
  border-top: 1px solid rgba(30, 111, 116, 0.15);
  border-right: 1px solid rgba(30, 111, 116, 0.15);
  border-bottom: 1px solid rgba(30, 111, 116, 0.15);
}

.reference-notice-title {
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-forest-ink);
  margin-bottom: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.reference-notice-text {
  font-size: 0.88rem;
  color: var(--color-slate-gray);
  line-height: 1.6;
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  background-color: var(--color-forest-ink);
  color: var(--color-mist);
  padding: 4.5rem 0 2.5rem 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 2.5rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(234, 242, 242, 0.12);
}

.footer-brand {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  max-width: 440px;
}

.footer-mark {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.footer-brand-text {
  display: flex;
  flex-direction: column;
}

.footer-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-warm-sand);
  letter-spacing: 0.02em;
  margin-bottom: 0.25rem;
}

.footer-desc {
  font-size: 0.88rem;
  color: var(--color-slate-light);
  line-height: 1.5;
}

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

.footer-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--color-mist);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding-top: 2rem;
  font-size: 0.85rem;
  color: var(--color-slate-light);
}

.back-to-top {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--color-mist);
  font-weight: 600;
  transition: color var(--transition-fast);
}

.back-to-top:hover {
  color: var(--color-saffron);
}

/* ============================================================
   Reveal Animations (Progressive Enhancement)
   ============================================================ */
html.js-enabled .reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.65s cubic-bezier(0.16, 1, 0.3, 1), transform 0.65s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

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

/* Stagger delays for children */
html.js-enabled .stagger-1 { transition-delay: 0.08s; }
html.js-enabled .stagger-2 { transition-delay: 0.16s; }
html.js-enabled .stagger-3 { transition-delay: 0.24s; }
html.js-enabled .stagger-4 { transition-delay: 0.32s; }
html.js-enabled .stagger-5 { transition-delay: 0.40s; }
html.js-enabled .stagger-6 { transition-delay: 0.48s; }

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

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

/* ============================================================
   Responsive Media Queries
   ============================================================ */

/* Tablet & Smaller Screens (< 1024px) */
@media (max-width: 1023px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .hero-content {
    max-width: 720px;
  }

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

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

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

  .principles-grid {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem 1.5rem;
  }

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

/* Mobile Screens (< 768px) */
@media (max-width: 767px) {
  :root {
    --container-padding: 1.25rem;
    --header-height: 72px;
  }

  .section-spacing {
    padding-top: 4rem;
    padding-bottom: 4rem;
  }

  .header-logo img {
    height: 40px;
  }

  /* Show Menu Toggle & Hide Desktop Nav */
  .nav-desktop,
  .header-action {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  /* Mobile Nav Drawer */
  .mobile-nav-drawer {
    display: block;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-warm-sand);
    padding: 2rem var(--container-padding);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
    z-index: 999;
    border-bottom: 1px solid var(--border-subtle);
    overflow-y: auto;
  }

  .mobile-nav-drawer.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    margin-bottom: 2rem;
  }

  .mobile-nav-link {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-forest-ink);
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-card);
  }

  .mobile-nav-action {
    width: 100%;
  }

  .mobile-nav-action .btn {
    width: 100%;
  }

  /* 1-column layouts */
  .themes-grid {
    grid-template-columns: 1fr;
  }

  .method-cards-grid {
    grid-template-columns: 1fr;
  }

  .researchers-grid {
    grid-template-columns: 1fr;
  }

  .library-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }

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

  .footer-top {
    flex-direction: column;
    gap: 2rem;
  }

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

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