/* ==========================================================================
   EVIDENCE & PRACTICE - CORE STYLESHEET
   Identity: Evidence & Practice | Learning, Movement, and Public Systems
   Design Style: Editorial, Academic, Scientific, Responsive
   ========================================================================== */

/* --------------------------------------------------------------------------
   01. DESIGN TOKENS & CSS VARIABLES
   -------------------------------------------------------------------------- */
:root {
  /* Color Palette */
  --color-deep-ink: #17252A;
  --color-emerald: #2E7D6A;
  --color-emerald-dark: #236354;
  --color-emerald-light: #E7F3EF;
  --color-soft-mint: #B9D8CB;
  --color-apricot: #E99B66;
  --color-apricot-light: #FDF3EB;
  --color-warm-linen: #F7F2E8;
  --color-cloud: #EEF2EF;
  --color-charcoal: #30393B;
  --color-muted-gray: #6E797A;
  --color-light-gray: #E2E8E5;
  --color-white: #FFFFFF;

  /* Typography */
  --font-serif: "Iowan Old Style", "Apple Garamond", "Baskerville", "Times New Roman", "Droid Serif", Times, "Source Serif Pro", serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* Layout & Spacing */
  --container-max-width: 1180px;
  --container-padding: 1.5rem;
  --header-height: 80px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Elevation & Borders */
  --border-subtle: 1px solid rgba(23, 37, 42, 0.08);
  --border-medium: 1px solid rgba(23, 37, 42, 0.16);
  --border-emerald: 1px solid rgba(46, 125, 106, 0.25);
  --shadow-subtle: 0 2px 8px rgba(23, 37, 42, 0.04);
  --shadow-card: 0 4px 16px rgba(23, 37, 42, 0.06);
  --shadow-hover: 0 8px 24px rgba(23, 37, 42, 0.1);

  /* Transitions */
  --transition-fast: 0.18s ease;
  --transition-base: 0.28s ease;
}

/* --------------------------------------------------------------------------
   02. RESET & BASE
   -------------------------------------------------------------------------- */
*,
*::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);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--color-charcoal);
  background-color: var(--color-warm-linen);
  overflow-x: hidden;
}

/* Accessibility: Skip to Main Content */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  background-color: var(--color-deep-ink);
  color: var(--color-white);
  padding: 0.75rem 1.25rem;
  z-index: 10000;
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: top var(--transition-fast);
}

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

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

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

a:hover {
  color: var(--color-emerald-dark);
}

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

ul,
ol {
  list-style: none;
}

/* --------------------------------------------------------------------------
   03. TYPOGRAPHY & COMMON UTILITIES
   -------------------------------------------------------------------------- */
.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);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-emerald);
  margin-bottom: 0.75rem;
}

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

.section-header {
  margin-bottom: 3.5rem;
  max-width: 780px;
}

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

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.85rem, 3.2vw, 2.65rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-deep-ink);
  letter-spacing: -0.015em;
  margin-bottom: 1rem;
}

.section-desc {
  font-size: 1.08rem;
  line-height: 1.6;
  color: var(--color-muted-gray);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.4rem;
  font-size: 0.94rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

.btn-primary:hover {
  background-color: var(--color-emerald-dark);
  border-color: var(--color-emerald-dark);
  color: var(--color-white);
  box-shadow: 0 4px 12px rgba(46, 125, 106, 0.25);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-deep-ink);
  border-color: var(--color-deep-ink);
}

.btn-secondary:hover {
  background-color: var(--color-deep-ink);
  color: var(--color-white);
  transform: translateY(-1px);
}

.btn-light {
  background-color: var(--color-white);
  color: var(--color-deep-ink);
  border-color: rgba(23, 37, 42, 0.12);
}

.btn-light:hover {
  background-color: var(--color-cloud);
  border-color: var(--color-deep-ink);
  color: var(--color-deep-ink);
  transform: translateY(-1px);
}

/* --------------------------------------------------------------------------
   04. HEADER & NAVIGATION
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(247, 242, 232, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: var(--border-subtle);
  height: var(--header-height);
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

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

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

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

.nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--color-charcoal);
  padding: 0.35rem 0.2rem;
  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-emerald);
  transition: width var(--transition-fast);
}

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

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

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

/* Mobile Toggle */
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid rgba(23, 37, 42, 0.15);
  border-radius: var(--radius-sm);
  padding: 0.55rem;
  cursor: pointer;
  color: var(--color-deep-ink);
  transition: all var(--transition-fast);
}

.nav-toggle:hover {
  background-color: rgba(23, 37, 42, 0.05);
}

.nav-toggle svg {
  width: 24px;
  height: 24px;
}

.nav-toggle .icon-close {
  display: none;
}

.nav-toggle[aria-expanded="true"] .icon-hamburger {
  display: none;
}

.nav-toggle[aria-expanded="true"] .icon-close {
  display: block;
}

/* --------------------------------------------------------------------------
   05. HERO SECTION
   -------------------------------------------------------------------------- */
.hero-section {
  padding: 4.5rem 0 5rem;
  position: relative;
  background: linear-gradient(180deg, var(--color-warm-linen) 0%, #FAF7F0 100%);
  border-bottom: var(--border-subtle);
}

.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: 0.6rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-emerald);
  background-color: var(--color-emerald-light);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  margin-bottom: 1.25rem;
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2.35rem, 4.2vw, 3.4rem);
  font-weight: 800;
  line-height: 1.18;
  color: var(--color-deep-ink);
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}

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

.hero-title .highlight-text::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 0;
  width: 100%;
  height: 8px;
  background-color: var(--color-soft-mint);
  opacity: 0.45;
  z-index: -1;
  border-radius: 2px;
}

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

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.hero-note {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--color-muted-gray);
  font-weight: 500;
}

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

/* Hero Pathway Visual (Pure HTML/CSS) */
.hero-visual-wrapper {
  position: relative;
}

.pathway-card {
  background-color: var(--color-white);
  border: var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-card);
  position: relative;
}

.pathway-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1.25rem;
  border-bottom: var(--border-subtle);
  margin-bottom: 1.5rem;
}

.pathway-badge {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-deep-ink);
  background-color: var(--color-warm-linen);
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-sm);
  border: var(--border-subtle);
}

.pathway-title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-deep-ink);
}

.pathway-stages {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  position: relative;
}

.pathway-stages::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 15px;
  bottom: 25px;
  width: 2px;
  background: linear-gradient(180deg, var(--color-emerald) 0%, var(--color-soft-mint) 50%, var(--color-apricot) 100%);
  z-index: 1;
}

.stage-item {
  display: flex;
  align-items: flex-start;
  gap: 1.2rem;
  position: relative;
  z-index: 2;
}

.stage-node {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--color-white);
  border: 2px solid var(--color-emerald);
  color: var(--color-deep-ink);
  font-size: 0.82rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.06);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.stage-item:last-child .stage-node {
  border-color: var(--color-apricot);
  background-color: var(--color-apricot-light);
  color: var(--color-deep-ink);
}

.stage-content {
  background-color: var(--color-cloud);
  padding: 0.85rem 1.1rem;
  border-radius: var(--radius-md);
  border: var(--border-subtle);
  flex-grow: 1;
  transition: background-color var(--transition-fast);
}

.stage-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--color-deep-ink);
  margin-bottom: 0.2rem;
}

.stage-desc {
  font-size: 0.84rem;
  color: var(--color-muted-gray);
  line-height: 1.45;
}

.pathway-footer {
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
  color: var(--color-muted-gray);
  font-weight: 600;
}

.pathway-footer-mark {
  width: 28px;
  height: 28px;
}

/* --------------------------------------------------------------------------
   06. STATS SECTION
   -------------------------------------------------------------------------- */
.stats-section {
  padding: 3rem 0;
  background-color: var(--color-deep-ink);
  color: var(--color-white);
}

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

.stat-card {
  padding: 1rem;
  border-left: 2px solid var(--color-emerald);
}

.stat-number {
  font-family: var(--font-serif);
  font-size: clamp(2.2rem, 3.5vw, 3rem);
  font-weight: 700;
  line-height: 1;
  color: var(--color-apricot);
  margin-bottom: 0.4rem;
}

.stat-label {
  font-size: 0.92rem;
  color: var(--color-soft-mint);
  font-weight: 500;
  line-height: 1.4;
}

/* --------------------------------------------------------------------------
   07. FIELDS SECTION
   -------------------------------------------------------------------------- */
.fields-section {
  padding: 5.5rem 0;
  background-color: var(--color-cloud);
}

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

.field-card {
  background-color: var(--color-white);
  border: var(--border-medium);
  border-radius: var(--radius-md);
  padding: 2.25rem;
  box-shadow: var(--shadow-subtle);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.field-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-emerald);
}

.field-number {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-emerald);
  margin-bottom: 0.75rem;
}

.field-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-deep-ink);
  margin-bottom: 1rem;
  line-height: 1.3;
}

.field-desc {
  font-size: 0.95rem;
  color: var(--color-charcoal);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.field-topics {
  padding-top: 1.25rem;
  border-top: var(--border-subtle);
}

.field-topics-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-muted-gray);
  margin-bottom: 0.6rem;
}

.topics-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.topic-tag {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-deep-ink);
  background-color: var(--color-warm-linen);
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-sm);
  border: var(--border-subtle);
}

/* --------------------------------------------------------------------------
   08. FRAMEWORK SECTION
   -------------------------------------------------------------------------- */
.framework-section {
  padding: 5.5rem 0;
  background-color: var(--color-white);
  border-top: var(--border-subtle);
  border-bottom: var(--border-subtle);
}

.framework-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: start;
}

.framework-checklist-card {
  background-color: var(--color-warm-linen);
  border: var(--border-medium);
  border-radius: var(--radius-lg);
  padding: 2.25rem;
}

.checklist-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-deep-ink);
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: var(--border-subtle);
}

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

.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.95rem;
  color: var(--color-charcoal);
  font-weight: 500;
}

.checklist-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: var(--color-emerald);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  margin-top: 2px;
}

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

.step-card {
  background-color: var(--color-cloud);
  border: var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  position: relative;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

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

.step-number {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-emerald);
  margin-bottom: 0.5rem;
}

.step-title {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-deep-ink);
  margin-bottom: 0.6rem;
}

.step-desc {
  font-size: 0.88rem;
  color: var(--color-charcoal);
  line-height: 1.55;
}

/* --------------------------------------------------------------------------
   09. RESEARCHERS SECTION (ACADEMIC REFERENCES)
   -------------------------------------------------------------------------- */
.researchers-section {
  padding: 5.5rem 0;
  background-color: var(--color-warm-linen);
}

.researchers-intro-banner {
  background-color: var(--color-white);
  border-left: 4px solid var(--color-emerald);
  border-top: var(--border-subtle);
  border-right: var(--border-subtle);
  border-bottom: var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 1.25rem 1.5rem;
  margin-bottom: 3rem;
  font-size: 0.94rem;
  color: var(--color-charcoal);
  line-height: 1.6;
}

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

.researcher-card {
  background-color: var(--color-white);
  border: var(--border-medium);
  border-radius: var(--radius-md);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-subtle);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.researcher-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-emerald);
}

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

.avatar-initials {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--color-deep-ink);
  color: var(--color-warm-linen);
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  letter-spacing: 0.05em;
  border: 2px solid var(--color-emerald);
}

.country-badge {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-muted-gray);
  background-color: var(--color-cloud);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  border: var(--border-subtle);
}

.researcher-name {
  font-family: var(--font-serif);
  font-size: 1.38rem;
  font-weight: 700;
  color: var(--color-deep-ink);
  margin-bottom: 0.25rem;
  line-height: 1.25;
}

.researcher-institution {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-emerald);
  margin-bottom: 0.2rem;
}

.researcher-dept {
  font-size: 0.82rem;
  color: var(--color-muted-gray);
  margin-bottom: 0.35rem;
}

.researcher-role {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-charcoal);
  background-color: var(--color-cloud);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
}

.researcher-summary {
  font-size: 0.88rem;
  color: var(--color-charcoal);
  line-height: 1.55;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.card-meta-footer {
  padding-top: 1rem;
  border-top: var(--border-subtle);
}

.orcid-identifier {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--color-muted-gray);
  background-color: var(--color-cloud);
  padding: 0.3rem 0.6rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
}

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

.card-tag {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--color-charcoal);
  background-color: var(--color-cloud);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  border: var(--border-subtle);
}

/* Alias Box */
.alias-box {
  margin-top: 1rem;
  background-color: var(--color-warm-linen);
  border: var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.75rem;
}

.alias-label {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-muted-gray);
  margin-bottom: 0.3rem;
}

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

.alias-email {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--color-deep-ink);
  font-weight: 600;
  word-break: break-all;
}

.copy-alias-btn {
  flex-shrink: 0;
  background-color: var(--color-white);
  border: var(--border-medium);
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-deep-ink);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: all var(--transition-fast);
}

.copy-alias-btn:hover {
  background-color: var(--color-emerald);
  border-color: var(--color-emerald);
  color: var(--color-white);
}

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

/* --------------------------------------------------------------------------
   10. LIBRARY SECTION
   -------------------------------------------------------------------------- */
.library-section {
  padding: 5.5rem 0;
  background-color: var(--color-cloud);
}

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

.library-card {
  background-color: var(--color-white);
  border: var(--border-medium);
  border-radius: var(--radius-md);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-subtle);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}

.library-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: var(--color-emerald);
}

.library-category {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-emerald);
  background-color: var(--color-emerald-light);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
  align-self: flex-start;
}

.library-title {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-deep-ink);
  margin-bottom: 0.75rem;
  line-height: 1.35;
}

.library-desc {
  font-size: 0.9rem;
  color: var(--color-charcoal);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   11. ABOUT SECTION & PRINCIPLES
   -------------------------------------------------------------------------- */
.about-section {
  padding: 5.5rem 0;
  background-color: var(--color-white);
  border-top: var(--border-subtle);
}

.about-intro-box {
  max-width: 820px;
  margin-bottom: 3.5rem;
}

.about-intro-text {
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--color-charcoal);
  margin-top: 1rem;
}

.principles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-bottom: 4rem;
}

.principle-card {
  background-color: var(--color-warm-linen);
  border: var(--border-medium);
  border-radius: var(--radius-md);
  padding: 2rem;
  display: flex;
  flex-direction: column;
}

.principle-number {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-emerald);
  margin-bottom: 0.5rem;
}

.principle-title {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-deep-ink);
  margin-bottom: 0.75rem;
}

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

/* Disclaimer Box */
.reference-notice-box {
  background-color: var(--color-cloud);
  border: 1px solid rgba(23, 37, 42, 0.12);
  border-left: 4px solid var(--color-apricot);
  border-radius: var(--radius-sm);
  padding: 1.5rem 2rem;
}

.notice-title {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-deep-ink);
  margin-bottom: 0.5rem;
}

.notice-text {
  font-size: 0.92rem;
  color: var(--color-charcoal);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   12. FOOTER
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: var(--color-deep-ink);
  color: var(--color-white);
  padding: 4.5rem 0 2.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
  max-width: 360px;
}

.footer-brand-header {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  margin-bottom: 0.75rem;
}

.footer-mark {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

.footer-brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--color-white);
}

.footer-brand-tagline {
  font-size: 0.92rem;
  color: var(--color-soft-mint);
  line-height: 1.5;
}

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

.footer-link {
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--color-warm-linen);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--color-soft-mint);
}

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

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

/* Toast Notification for Clipboard Copy */
.toast-notification {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background-color: var(--color-deep-ink);
  color: var(--color-white);
  padding: 0.8rem 1.4rem;
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--color-emerald);
  font-size: 0.88rem;
  font-weight: 600;
  box-shadow: var(--shadow-hover);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-base);
  z-index: 9999;
}

.toast-notification.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* --------------------------------------------------------------------------
   13. ANIMATIONS & PROGRESSIVE ENHANCEMENT
   -------------------------------------------------------------------------- */
/* By default (.reveal without .js-enabled), all elements are visible! */
.reveal {
  opacity: 1;
  transform: none;
}

/* Progressive enhancement: Only animate if JS is enabled and motion allowed */
.js-enabled .reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

@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;
  }
}

/* --------------------------------------------------------------------------
   14. RESPONSIVE MEDIA QUERIES
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

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

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

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

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

@media (max-width: 768px) {
  :root {
    --header-height: 70px;
  }

  .site-header .container {
    position: relative;
  }

  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .nav-wrapper {
    position: absolute;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background-color: var(--color-warm-linen);
    border-bottom: var(--border-medium);
    box-shadow: var(--shadow-hover);
    padding: 1.5rem var(--container-padding);
    flex-direction: column;
    align-items: flex-start;
    gap: 1.5rem;
    display: none;
  }

  .nav-wrapper.is-open {
    display: flex;
  }

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    gap: 1rem;
  }

  .nav-link {
    display: block;
    width: 100%;
    font-size: 1.05rem;
    padding: 0.5rem 0;
  }

  .header-cta {
    width: 100%;
  }

  .header-cta .btn {
    width: 100%;
  }

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

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

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

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

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

  .hero-title {
    font-size: 2.15rem;
  }

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

  .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: 1.25rem;
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .pathway-card {
    padding: 1.25rem;
  }
}