/* ============================================================
   THE LEARNING MOSAIC - STYLESHEET
   01. Design tokens
   02. Reset and base
   03. Accessibility
   04. Typography
   05. Layout
   06. Header
   07. Hero
   08. Concept strip
   09. Lenses
   10. Crossings
   11. Inquiry
   12. Academic references
   13. Independence note
   14. Study shelf
   15. About
   16. CTA
   17. Footer
   18. Reveal states
   19. Responsive
   20. Reduced motion
   ============================================================ */

/* ============================================================
   01. DESIGN TOKENS
   ============================================================ */
:root {
  /* Color Palette */
  --color-night-graphite: #22242D;
  --color-academic-cobalt: #4966B1;
  --color-raspberry: #B34E70;
  --color-saffron: #D9A83E;
  --color-soft-ice: #EAF0F5;
  --color-pearl: #F9F7F2;
  --color-lavender-gray: #E8E6EE;
  --color-deep-text: #2C3038;
  --color-muted-slate: #707682;
  --color-white: #FFFFFF;

  /* Alpha Accents */
  --color-cobalt-light: rgba(73, 102, 177, 0.08);
  --color-raspberry-light: rgba(179, 78, 112, 0.08);
  --color-saffron-light: rgba(217, 168, 62, 0.12);
  --color-border-subtle: rgba(34, 36, 45, 0.10);
  --color-border-medium: rgba(34, 36, 45, 0.18);
  --color-border-dark: rgba(255, 255, 255, 0.12);

  /* Typography Stacks */
  --font-serif: Georgia, "Times New Roman", Times, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  /* Modular Typography Scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.8125rem);
  --text-sm: clamp(0.8438rem, 0.8rem + 0.22vw, 0.9063rem);
  --text-base: clamp(0.9688rem, 0.92rem + 0.25vw, 1.0625rem);
  --text-md: clamp(1.0938rem, 1.02rem + 0.38vw, 1.2188rem);
  --text-lg: clamp(1.25rem, 1.15rem + 0.5vw, 1.4375rem);
  --text-xl: clamp(1.5rem, 1.35rem + 0.75vw, 1.8125rem);
  --text-2xl: clamp(1.875rem, 1.65rem + 1.1vw, 2.375rem);
  --text-3xl: clamp(2.25rem, 1.95rem + 1.5vw, 3.125rem);
  --text-hero: clamp(2.4rem, 2rem + 2vw, 3.75rem);

  /* Spacing */
  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4.5rem;
  --space-4xl: 6rem;

  /* Layout & Radii */
  --container-max: 1200px;
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Shadows & Transitions */
  --shadow-subtle: 0 2px 8px rgba(34, 36, 45, 0.04);
  --shadow-card: 0 4px 16px rgba(34, 36, 45, 0.06);
  --shadow-hover: 0 8px 24px rgba(34, 36, 45, 0.09);
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* ============================================================
   02. RESET AND BASE
   ============================================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%;
  scroll-behavior: smooth;
  text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
  background-color: var(--color-pearl);
  color: var(--color-deep-text);
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.65;
  background-color: var(--color-pearl);
  color: var(--color-deep-text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
  color: var(--color-night-graphite);
}

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

/* ============================================================
   03. ACCESSIBILITY
   ============================================================ */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1.5rem;
  background: var(--color-night-graphite);
  color: var(--color-white);
  padding: 0.75rem 1.25rem;
  font-weight: 600;
  font-size: var(--text-sm);
  border-radius: var(--radius-sm);
  z-index: 9999;
  box-shadow: var(--shadow-hover);
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 1.5rem;
  outline: 3px solid var(--color-saffron);
  outline-offset: 2px;
}

:focus-visible {
  outline: 2px solid var(--color-academic-cobalt);
  outline-offset: 3px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   04. TYPOGRAPHY
   ============================================================ */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  color: var(--color-night-graphite);
  line-height: 1.25;
  font-weight: 700;
}

h1 {
  font-size: var(--text-hero);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--text-2xl);
  letter-spacing: -0.015em;
  margin-bottom: var(--space-md);
}

h3 {
  font-size: var(--text-lg);
  letter-spacing: -0.01em;
  margin-bottom: var(--space-xs);
}

p {
  margin-bottom: 1rem;
}

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

.eyebrow {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-academic-cobalt);
  margin-bottom: var(--space-sm);
}

.eyebrow-raspberry {
  color: var(--color-raspberry);
}

.eyebrow-light {
  color: var(--color-saffron);
}

.section-desc {
  font-size: var(--text-md);
  color: var(--color-muted-slate);
  max-width: 680px;
  line-height: 1.6;
}

/* ============================================================
   05. LAYOUT & UTILITIES
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-4xl) 0;
  border-bottom: 1px solid var(--color-border-subtle);
}

.section-header {
  margin-bottom: var(--space-2xl);
}

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

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.35rem;
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
  text-decoration: none;
  line-height: 1.2;
}

.btn-primary {
  background-color: var(--color-night-graphite);
  color: var(--color-white);
  border: 1px solid var(--color-night-graphite);
}

.btn-primary:hover {
  background-color: var(--color-academic-cobalt);
  border-color: var(--color-academic-cobalt);
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-subtle);
}

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

.btn-secondary:hover {
  background-color: var(--color-white);
  border-color: var(--color-night-graphite);
  color: var(--color-night-graphite);
  transform: translateY(-1px);
}

.btn-small {
  padding: 0.5rem 0.9rem;
  font-size: var(--text-xs);
}

/* Tags */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
}

.tag {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  font-size: var(--text-xs);
  font-weight: 500;
  background-color: var(--color-white);
  color: var(--color-deep-text);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-xs);
}

/* ============================================================
   06. HEADER
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(249, 247, 242, 0.94);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border-subtle);
  padding: var(--space-sm) 0;
  transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

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

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

.site-brand img {
  height: 38px;
  width: auto;
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  list-style: none;
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-deep-text);
  padding: 0.25rem 0;
  position: relative;
}

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

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

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

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

/* Hamburger toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-around;
  width: 36px;
  height: 36px;
  padding: 6px;
  background: transparent;
  border-radius: var(--radius-xs);
}

.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-night-graphite);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Mobile Nav Overlay */
.mobile-nav-panel {
  display: none;
}

/* ============================================================
   07. HERO
   ============================================================ */
.hero-section {
  padding: var(--space-3xl) 0 var(--space-4xl) 0;
  background-color: var(--color-pearl);
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border-subtle);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--space-3xl);
  align-items: center;
}

.hero-text {
  max-width: 640px;
}

.hero-title {
  margin-bottom: var(--space-lg);
}

.hero-highlight {
  color: var(--color-academic-cobalt);
  font-style: italic;
  position: relative;
  display: inline;
}

.hero-lead {
  font-size: var(--text-md);
  color: var(--color-deep-text);
  line-height: 1.68;
  margin-bottom: var(--space-xl);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.hero-note {
  font-size: var(--text-xs);
  color: var(--color-muted-slate);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 600;
}

/* Mosaic Hero Composition */
.hero-mosaic-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-card);
  position: relative;
}

.hero-mosaic-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border-subtle);
}

.hero-mosaic-title {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-muted-slate);
  text-transform: uppercase;
}

.hero-mosaic-mark {
  width: 28px;
  height: 28px;
}

.hero-mosaic-stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  position: relative;
}

.mosaic-layer {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  border: 1px solid transparent;
}

.mosaic-layer:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-subtle);
}

.layer-machine {
  background-color: var(--color-soft-ice);
  border-left: 4px solid var(--color-academic-cobalt);
}

.layer-human {
  background-color: var(--color-lavender-gray);
  border-left: 4px solid var(--color-raspberry);
}

.layer-neural {
  background-color: #F3F1EC;
  border-left: 4px solid var(--color-night-graphite);
}

.layer-tag {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: var(--space-2xs);
}

.layer-machine .layer-tag { color: var(--color-academic-cobalt); }
.layer-human .layer-tag { color: var(--color-raspberry); }
.layer-neural .layer-tag { color: var(--color-night-graphite); }

.layer-heading {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-night-graphite);
  margin-bottom: 0.2rem;
}

.layer-desc {
  font-size: var(--text-xs);
  color: var(--color-deep-text);
  line-height: 1.45;
}

.mosaic-core-badge {
  align-self: center;
  margin: -6px 0;
  z-index: 2;
  background-color: var(--color-saffron);
  color: var(--color-night-graphite);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.25rem 0.85rem;
  border-radius: var(--radius-full);
  box-shadow: 0 2px 6px rgba(217, 168, 62, 0.35);
}

.hero-mosaic-footer {
  margin-top: var(--space-lg);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-border-subtle);
  text-align: center;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--color-muted-slate);
}

/* ============================================================
   08. CONCEPT STRIP
   ============================================================ */
.concept-strip {
  background-color: var(--color-night-graphite);
  color: var(--color-white);
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--color-border-dark);
  border-bottom: 1px solid var(--color-border-dark);
}

.concept-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.concept-header-block {
  text-align: center;
  max-width: 820px;
  margin: 0 auto;
}

.concept-question {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  color: var(--color-white);
  font-style: italic;
  line-height: 1.35;
}

.concept-statements {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin-top: var(--space-sm);
}

.statement-box {
  background-color: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-md);
  transition: background-color var(--transition-base);
}

.statement-box:hover {
  background-color: rgba(255, 255, 255, 0.06);
}

.statement-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.dot-cobalt { background-color: var(--color-academic-cobalt); }
.dot-raspberry { background-color: var(--color-raspberry); }
.dot-saffron { background-color: var(--color-saffron); }

.statement-text {
  font-size: var(--text-sm);
  color: var(--color-pearl);
  font-weight: 500;
  line-height: 1.4;
  margin-bottom: 0;
}

/* ============================================================
   09. LENSES
   ============================================================ */
.lenses-section {
  background-color: var(--color-pearl);
}

.lenses-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}

.lens-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-xl) var(--space-lg);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-subtle);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  position: relative;
  overflow: hidden;
}

.lens-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background-color: var(--color-academic-cobalt);
}

.lens-card:nth-child(2)::before { background-color: var(--color-raspberry); }
.lens-card:nth-child(3)::before { background-color: var(--color-saffron); }
.lens-card:nth-child(4)::before { background-color: var(--color-night-graphite); }

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

.lens-num {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-muted-slate);
  margin-bottom: var(--space-xs);
}

.lens-title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-sm);
  color: var(--color-night-graphite);
}

.lens-desc {
  font-size: var(--text-sm);
  color: var(--color-deep-text);
  line-height: 1.55;
  margin-bottom: var(--space-lg);
  flex-grow: 1;
}

.lens-topics-label {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted-slate);
  margin-bottom: 0.4rem;
}

/* ============================================================
   10. CROSSINGS
   ============================================================ */
.crossings-section {
  background-color: var(--color-soft-ice);
}

.crossings-wrapper {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.crossing-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  box-shadow: var(--shadow-subtle);
  display: grid;
  grid-template-columns: 240px 1fr 240px;
  gap: var(--space-xl);
  align-items: center;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.crossing-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
}

.crossing-badge-area {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}

.crossing-index {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-academic-cobalt);
}

.crossing-name {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  color: var(--color-night-graphite);
}

.crossing-question-area {
  border-left: 2px solid var(--color-border-subtle);
  border-right: 2px solid var(--color-border-subtle);
  padding: 0 var(--space-xl);
}

.crossing-question {
  font-size: var(--text-base);
  font-style: italic;
  color: var(--color-deep-text);
  line-height: 1.5;
  margin-bottom: 0;
}

.crossing-relations {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.crossing-relations-title {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-muted-slate);
}

/* ============================================================
   11. INQUIRY
   ============================================================ */
.inquiry-section {
  background-color: var(--color-pearl);
}

.inquiry-layout {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-3xl);
  align-items: start;
}

.inquiry-cycle-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  position: relative;
}

.inquiry-step-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  display: flex;
  gap: var(--space-lg);
  align-items: flex-start;
  box-shadow: var(--shadow-subtle);
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.inquiry-step-card:hover {
  transform: translateX(4px);
  border-color: var(--color-academic-cobalt);
}

.inquiry-step-num {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-academic-cobalt);
  line-height: 1;
  padding: var(--space-xs) 0;
}

.inquiry-step-content h3 {
  font-size: var(--text-base);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-night-graphite);
  margin-bottom: 0.25rem;
}

.inquiry-step-content p {
  font-size: var(--text-sm);
  color: var(--color-deep-text);
  line-height: 1.5;
  margin-bottom: 0;
}

/* Inquiry Checklist */
.inquiry-checklist-card {
  background-color: var(--color-lavender-gray);
  border: 1px solid var(--color-border-medium);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}

.inquiry-checklist-card h3 {
  font-size: var(--text-lg);
  color: var(--color-night-graphite);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--color-border-subtle);
}

.checklist-items {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  font-size: var(--text-sm);
  color: var(--color-deep-text);
  line-height: 1.45;
}

.check-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--color-raspberry);
}

/* ============================================================
   12. ACADEMIC REFERENCES
   ============================================================ */
.references-section {
  background-color: var(--color-pearl);
}

.references-disclaimer-box {
  background-color: var(--color-white);
  border: 1px solid var(--color-border-medium);
  border-left: 4px solid var(--color-saffron);
  border-radius: var(--radius-sm);
  padding: var(--space-md) var(--space-lg);
  margin-bottom: var(--space-2xl);
}

.references-disclaimer-text {
  font-size: var(--text-sm);
  color: var(--color-deep-text);
  line-height: 1.55;
  margin-bottom: 0.5rem;
}

.references-contact-note {
  font-size: var(--text-xs);
  color: var(--color-muted-slate);
  font-weight: 600;
  margin-bottom: 0;
}

.references-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.profile-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-xl) var(--space-lg);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-subtle);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  position: relative;
}

.profile-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card);
}

.profile-card.is-contact {
  border-top: 3px solid var(--color-academic-cobalt);
}

.profile-card.is-reference {
  border-top: 3px solid var(--color-muted-slate);
}

.profile-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.profile-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--color-night-graphite);
  color: var(--color-pearl);
  font-family: var(--font-serif);
  font-size: var(--text-md);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.profile-meta-head {
  display: flex;
  flex-direction: column;
}

.profile-pill {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-xs);
  margin-bottom: 0.2rem;
  width: fit-content;
}

.pill-contact {
  background-color: var(--color-cobalt-light);
  color: var(--color-academic-cobalt);
}

.pill-reference {
  background-color: rgba(112, 118, 130, 0.12);
  color: var(--color-muted-slate);
}

.profile-country {
  font-size: var(--text-xs);
  color: var(--color-muted-slate);
  font-weight: 600;
}

.profile-name {
  font-size: var(--text-lg);
  color: var(--color-night-graphite);
  margin-bottom: 0.25rem;
}

.profile-affiliation {
  font-size: var(--text-xs);
  color: var(--color-muted-slate);
  margin-bottom: 0.2rem;
  font-weight: 600;
}

.profile-role {
  font-size: var(--text-xs);
  color: var(--color-deep-text);
  font-style: italic;
  margin-bottom: var(--space-md);
}

.profile-summary {
  font-size: var(--text-sm);
  color: var(--color-deep-text);
  line-height: 1.5;
  margin-bottom: var(--space-md);
  flex-grow: 1;
}

.profile-tags {
  margin-bottom: var(--space-md);
}

.profile-identifier {
  font-size: var(--text-xs);
  color: var(--color-muted-slate);
  font-family: monospace;
  margin-bottom: var(--space-md);
  padding: 0.35rem 0.5rem;
  background-color: var(--color-pearl);
  border-radius: var(--radius-xs);
}

.profile-contact-action {
  margin-top: auto;
  padding-top: var(--space-md);
  border-top: 1px solid var(--color-border-subtle);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.profile-email-link {
  font-size: var(--text-xs);
  word-break: break-all;
  font-weight: 600;
}

.btn-copy {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.4rem 0.75rem;
  font-size: var(--text-xs);
  font-weight: 600;
  background-color: var(--color-pearl);
  border: 1px solid var(--color-border-medium);
  border-radius: var(--radius-xs);
  color: var(--color-night-graphite);
  transition: all var(--transition-fast);
}

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

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

/* ============================================================
   13. INDEPENDENCE NOTE
   ============================================================ */
.independence-note-section {
  background-color: var(--color-lavender-gray);
  border-top: 1px solid var(--color-border-medium);
  border-bottom: 1px solid var(--color-border-medium);
}

.independence-box {
  max-width: 860px;
  margin: 0 auto;
  text-align: center;
}

.independence-box h2 {
  margin-bottom: var(--space-md);
}

.independence-box p {
  font-size: var(--text-base);
  color: var(--color-deep-text);
  line-height: 1.65;
  margin-bottom: 1.25rem;
}

/* ============================================================
   14. STUDY SHELF
   ============================================================ */
.study-shelf-section {
  background-color: var(--color-pearl);
}

.search-container {
  max-width: 720px;
  margin: 0 auto var(--space-2xl) auto;
}

.search-box-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  background-color: var(--color-white);
  border: 2px solid var(--color-border-medium);
  border-radius: var(--radius-md);
  padding: 0.5rem 1rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-box-wrapper:focus-within {
  border-color: var(--color-academic-cobalt);
  box-shadow: 0 0 0 3px rgba(73, 102, 177, 0.15);
}

.search-icon {
  width: 20px;
  height: 20px;
  color: var(--color-muted-slate);
  flex-shrink: 0;
}

.search-input {
  flex-grow: 1;
  border: none;
  background: transparent;
  font-size: var(--text-base);
  color: var(--color-deep-text);
  padding: 0.35rem 0;
}

.search-input:focus {
  outline: none;
}

.search-input::placeholder {
  color: var(--color-muted-slate);
}

.btn-clear {
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-xs);
  background-color: var(--color-lavender-gray);
  color: var(--color-deep-text);
  transition: background-color var(--transition-fast);
}

.btn-clear:hover {
  background-color: var(--color-border-medium);
}

.btn-clear[hidden] {
  display: none;
}

.search-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--space-xs);
  padding: 0 0.5rem;
}

.study-count {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-muted-slate);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.no-results {
  text-align: center;
  padding: var(--space-3xl) var(--space-lg);
  background-color: var(--color-white);
  border: 1px dashed var(--color-border-medium);
  border-radius: var(--radius-md);
  margin-top: var(--space-lg);
}

.no-results p {
  font-size: var(--text-md);
  color: var(--color-muted-slate);
  font-style: italic;
}

.no-results[hidden] {
  display: none;
}

.study-shelf-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.study-article {
  background-color: var(--color-white);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  box-shadow: var(--shadow-subtle);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.study-article:hover {
  border-color: var(--color-border-medium);
  box-shadow: var(--shadow-card);
}

.study-article[hidden] {
  display: none;
}

.study-category {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-academic-cobalt);
  margin-bottom: 0.25rem;
}

.study-title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-xs);
  color: var(--color-night-graphite);
}

.study-summary {
  font-size: var(--text-sm);
  color: var(--color-deep-text);
  line-height: 1.55;
  margin-bottom: var(--space-md);
}

.study-details {
  border-top: 1px solid var(--color-border-subtle);
  padding-top: var(--space-sm);
}

.study-details summary {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-academic-cobalt);
  cursor: pointer;
  padding: 0.4rem 0;
  user-select: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.study-details summary:hover {
  color: var(--color-night-graphite);
}

.study-details summary::-webkit-details-marker {
  display: none;
}

.study-details summary::after {
  content: "+";
  font-size: 1.1rem;
  font-weight: 400;
  transition: transform var(--transition-fast);
}

.study-details[open] summary::after {
  content: "−";
}

.study-expanded-content {
  padding-top: var(--space-sm);
  font-size: var(--text-sm);
  color: var(--color-deep-text);
  line-height: 1.6;
}

.study-tags-wrapper {
  margin-top: var(--space-md);
  padding-top: var(--space-xs);
}

/* ============================================================
   15. ABOUT
   ============================================================ */
.about-section {
  background-color: var(--color-pearl);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.about-lead-text p {
  font-size: var(--text-md);
  line-height: 1.68;
  color: var(--color-deep-text);
  margin-bottom: var(--space-md);
}

.about-principles {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.principle-card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  box-shadow: var(--shadow-subtle);
}

.principle-num {
  font-family: var(--font-serif);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-academic-cobalt);
  margin-bottom: 0.2rem;
}

.principle-title {
  font-size: var(--text-base);
  margin-bottom: 0.35rem;
}

.principle-desc {
  font-size: var(--text-sm);
  color: var(--color-muted-slate);
  line-height: 1.5;
  margin-bottom: 0;
}

/* ============================================================
   16. CTA
   ============================================================ */
.final-cta-section {
  background-color: var(--color-soft-ice);
  text-align: center;
  padding: var(--space-4xl) 0;
}

.cta-box {
  max-width: 680px;
  margin: 0 auto;
}

.cta-box .section-desc {
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--space-xl);
}

.cta-actions {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* ============================================================
   17. FOOTER
   ============================================================ */
.site-footer {
  background-color: var(--color-night-graphite);
  color: var(--color-pearl);
  padding: var(--space-3xl) 0 var(--space-xl) 0;
  margin-top: auto;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-2xl);
  padding-bottom: var(--space-2xl);
  border-bottom: 1px solid var(--color-border-dark);
}

.footer-brand-block {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  max-width: 360px;
}

.footer-mark-wrapper {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.footer-mark-wrapper img {
  width: 32px;
  height: 32px;
}

.footer-title {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.05em;
}

.footer-desc {
  font-size: var(--text-xs);
  color: var(--color-muted-slate);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.footer-note {
  font-size: var(--text-xs);
  color: var(--color-pearl);
  opacity: 0.8;
  margin-top: var(--space-xs);
}

.footer-nav-block {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-nav-title {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-saffron);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md) var(--space-lg);
  list-style: none;
}

.footer-link {
  font-size: var(--text-sm);
  color: var(--color-pearl);
  opacity: 0.85;
}

.footer-link:hover {
  color: var(--color-white);
  opacity: 1;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-lg);
  font-size: var(--text-xs);
  color: var(--color-muted-slate);
  flex-wrap: wrap;
  gap: var(--space-md);
}

.back-to-top {
  color: var(--color-pearl);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.8rem;
  background-color: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius-xs);
  transition: all var(--transition-fast);
}

.back-to-top:hover {
  background-color: rgba(255, 255, 255, 0.12);
  color: var(--color-white);
}

/* ============================================================
   18. REVEAL STATES
   ============================================================ */
/* Default: completely visible without JavaScript */
.reveal {
  opacity: 1;
  transform: none;
}

/* Enabled only when JS runs */
.js-enabled .reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

/* ============================================================
   19. RESPONSIVE
   ============================================================ */
@media (max-width: 1080px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

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

  .hero-mosaic-card {
    max-width: 580px;
    margin: 0 auto;
  }

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

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

  .crossing-card {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .crossing-question-area {
    border-left: none;
    border-right: none;
    border-top: 1px solid var(--color-border-subtle);
    border-bottom: 1px solid var(--color-border-subtle);
    padding: var(--space-md) 0;
  }
}

@media (max-width: 860px) {
  .nav-desktop,
  .header-cta {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .mobile-nav-panel {
    position: fixed;
    top: 61px;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-pearl);
    padding: var(--space-xl);
    display: none;
    flex-direction: column;
    gap: var(--space-xl);
    overflow-y: auto;
    z-index: 999;
    border-top: 1px solid var(--color-border-subtle);
  }

  .mobile-nav-panel.is-active {
    display: flex;
  }

  .mobile-nav-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    list-style: none;
  }

  .mobile-nav-link {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-night-graphite);
    padding: var(--space-xs) 0;
    display: block;
  }

  .concept-statements {
    grid-template-columns: 1fr;
  }

  .inquiry-layout {
    grid-template-columns: 1fr;
  }

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

  .study-shelf-grid {
    grid-template-columns: 1fr;
  }

  .footer-top {
    flex-direction: column;
    gap: var(--space-xl);
  }
}

@media (max-width: 600px) {
  .lenses-grid {
    grid-template-columns: 1fr;
  }

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

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

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

  .cta-actions {
    flex-direction: column;
    align-items: stretch;
  }

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

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

/* ============================================================
   20. REDUCED MOTION
   ============================================================ */
@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;
  }

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