/* ============================================
   DEEZIPA WEBSITE — STYLES
   Version 1.0
   ============================================ */

/* -------------------------------------------
   CSS CUSTOM PROPERTIES
   ------------------------------------------- */
:root {
  /* Color System */
  --color-bg:          #FAF8F5;
  --color-bg-warm:     #F5F0EA;
  --color-bg-alt:      #EDE8E1;
  --color-text:        #2C2C2C;
  --color-text-muted:  #5A5A5A;
  --color-text-light:  #8A8A8A;
  --color-accent:      #1B4332;
  --color-accent-light:#2D6A4F;
  --color-accent-subtle:#E8F0EC;
  --color-earth:       #8B6914;
  --color-earth-light: #B8860B;
  --color-earth-subtle:#F5EDDA;
  --color-border:      #D4CFC8;
  --color-border-light:#E8E3DC;
  --color-white:       #FFFFFF;
  --color-black:       #1A1A1A;

  /* Typography Scale */
  --font-serif:        'Georgia', 'Times New Roman', 'Palatino Linotype', serif;
  --font-sans:         'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --font-mono:         'SF Mono', 'Fira Code', 'Fira Mono', monospace;

  --text-xs:           clamp(0.7rem, 0.65rem + 0.25vw, 0.75rem);
  --text-sm:           clamp(0.8rem, 0.75rem + 0.25vw, 0.875rem);
  --text-base:         clamp(0.95rem, 0.9rem + 0.25vw, 1.05rem);
  --text-md:           clamp(1rem, 0.95rem + 0.3vw, 1.15rem);
  --text-lg:           clamp(1.15rem, 1rem + 0.5vw, 1.35rem);
  --text-xl:           clamp(1.3rem, 1.1rem + 0.8vw, 1.75rem);
  --text-2xl:          clamp(1.6rem, 1.2rem + 1.5vw, 2.5rem);
  --text-3xl:          clamp(2rem, 1.5rem + 2vw, 3.25rem);
  --text-4xl:          clamp(2.5rem, 1.8rem + 3vw, 4.5rem);

  /* Spacing */
  --space-xs:          0.25rem;
  --space-sm:          0.5rem;
  --space-md:          1rem;
  --space-lg:          1.5rem;
  --space-xl:          2rem;
  --space-2xl:         3rem;
  --space-3xl:         4rem;
  --space-4xl:         6rem;
  --space-5xl:         8rem;

  /* Layout */
  --max-width:         1200px;
  --max-width-narrow:  900px;
  --nav-height:        64px;

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-base:   250ms ease;
  --transition-slow:   400ms ease;

  /* Shadows */
  --shadow-sm:         0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:         0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg:         0 8px 30px rgba(0,0,0,0.08);
}

/* -------------------------------------------
   RESET & BASE
   ------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

button {
  background: none;
  border: none;
  cursor: pointer;
  font: inherit;
  color: inherit;
}

/* Focus States */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

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

/* -------------------------------------------
   CONTAINER
   ------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* -------------------------------------------
   SECTION HEADER (reusable)
   ------------------------------------------- */
.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-header__eyebrow {
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-earth);
  margin-bottom: var(--space-sm);
  font-weight: 500;
}

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

.section-header__title {
  font-family: var(--font-serif);
  font-size: var(--text-3xl);
  font-weight: 400;
  line-height: 1.2;
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

.section-header__subtitle {
  font-size: var(--text-md);
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

.section-header--left .section-header__subtitle {
  margin: 0;
}

/* -------------------------------------------
   BUTTONS
   ------------------------------------------- */
.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.03em;
  border-radius: 3px;
  transition: all var(--transition-base);
  cursor: pointer;
}

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

.btn--primary:hover {
  background-color: var(--color-accent-light);
  border-color: var(--color-accent-light);
}

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

.btn--secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ===========================================
   NAVIGATION
   =========================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(250, 248, 245, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.site-header--scrolled {
  background-color: rgba(250, 248, 245, 0.97);
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.04);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: var(--nav-height);
}

.nav__logo {
  font-family: var(--font-sans);
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--color-text);
  text-transform: uppercase;
}

.nav__logo:hover {
  color: var(--color-accent);
}

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

.nav__link {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-accent);
  transition: width var(--transition-base);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-text);
}

.nav__link:hover::after,
.nav__link--active::after {
  width: 100%;
}

.nav__link--cta {
  background-color: var(--color-accent);
  color: var(--color-white) !important;
  padding: 0.45rem 1.1rem;
  border-radius: 3px;
  font-weight: 500;
}

.nav__link--cta::after {
  display: none;
}

.nav__link--cta:hover {
  background-color: var(--color-accent-light);
}

/* Mobile Toggle */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  z-index: 1001;
}

.nav__toggle-bar {
  display: block;
  width: 100%;
  height: 1.5px;
  background-color: var(--color-text);
  transition: all var(--transition-base);
  transform-origin: center;
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(1) {
  transform: rotate(45deg) translate(4px, 5px);
}

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

.nav__toggle[aria-expanded="true"] .nav__toggle-bar:nth-child(3) {
  transform: rotate(-45deg) translate(4px, -5px);
}

/* ===========================================
   HERO
   =========================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(var(--nav-height) + var(--space-3xl)) var(--space-lg) var(--space-3xl);
  overflow: hidden;
}

.hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 720px;
}

.hero__eyebrow {
  font-size: var(--text-sm);
  letter-spacing: 0.2em;
  color: var(--color-earth);
  text-transform: uppercase;
  margin-bottom: var(--space-lg);
  font-weight: 500;
}

.hero__title {
  font-family: var(--font-serif);
  font-size: var(--text-4xl);
  font-weight: 400;
  line-height: 1.15;
  color: var(--color-text);
  margin-bottom: var(--space-xl);
}

.hero__subtitle {
  font-size: var(--text-md);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-2xl);
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

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

/* Hero Abstract Visual */
.hero__visual {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

.hero__line {
  position: absolute;
  background-color: var(--color-border-light);
}

.hero__line--1 {
  width: 1px;
  height: 40%;
  top: 15%;
  left: 20%;
  opacity: 0.5;
}

.hero__line--2 {
  width: 30%;
  height: 1px;
  top: 60%;
  left: 35%;
  opacity: 0.4;
}

.hero__line--3 {
  width: 1px;
  height: 25%;
  bottom: 10%;
  right: 25%;
  opacity: 0.3;
}

.hero__node {
  position: absolute;
  border-radius: 50%;
  background-color: var(--color-accent);
  opacity: 0.12;
}

.hero__node--1 {
  width: 8px;
  height: 8px;
  top: 15%;
  left: 20%;
}

.hero__node--2 {
  width: 6px;
  height: 6px;
  top: 40%;
  left: 55%;
}

.hero__node--3 {
  width: 10px;
  height: 10px;
  top: 60%;
  left: 35%;
  opacity: 0.18;
}

.hero__node--4 {
  width: 5px;
  height: 5px;
  top: 75%;
  right: 30%;
}

.hero__node--5 {
  width: 7px;
  height: 7px;
  bottom: 10%;
  right: 25%;
  opacity: 0.15;
}

/* ===========================================
   ORIGIN
   =========================================== */
.origin {
  padding: var(--space-5xl) 0;
  background-color: var(--color-bg-warm);
}

.origin__content {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
}

.origin__heading {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 400;
  line-height: 1.3;
  margin-bottom: var(--space-md);
}

.origin__subtext {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-style: italic;
  color: var(--color-earth);
  margin-bottom: var(--space-2xl);
}

.origin__body {
  font-size: var(--text-md);
  color: var(--color-text-muted);
  line-height: 1.8;
}

/* ===========================================
   JOURNEY / TIMELINE
   =========================================== */
.journey {
  padding: var(--space-5xl) 0;
}

.timeline {
  position: relative;
  max-width: 700px;
  margin: 0 auto;
  padding-left: 40px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 1px;
  background-color: var(--color-border);
}

.timeline__item {
  position: relative;
  margin-bottom: var(--space-3xl);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.timeline__item.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.timeline__marker {
  position: absolute;
  left: -28px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-bg);
  border: 2px solid var(--color-accent);
  z-index: 2;
}

.timeline__item[data-stage="07"] .timeline__marker {
  background-color: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-accent-subtle);
}

.timeline__card {
  padding: var(--space-lg) var(--space-xl);
  background-color: var(--color-white);
  border: 1px solid var(--color-border-light);
  border-radius: 4px;
  transition: box-shadow var(--transition-base);
}

.timeline__card:hover {
  box-shadow: var(--shadow-md);
}

.timeline__number {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-earth);
  letter-spacing: 0.1em;
  display: block;
  margin-bottom: var(--space-xs);
}

.timeline__title {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 400;
  margin-bottom: var(--space-sm);
}

.timeline__text {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ===========================================
   EARLY LEARNING PHILOSOPHY
   =========================================== */
.learning {
  padding: var(--space-5xl) 0;
  background-color: var(--color-bg-warm);
}

.learning__content {
  max-width: 720px;
  margin: 0 auto;
}

.learning__body p {
  font-size: var(--text-md);
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
}

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

/* ===========================================
   TECHNOLOGY
   =========================================== */
.technology {
  padding: var(--space-5xl) 0;
}

.tech-progression {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  max-width: 400px;
  margin: 0 auto var(--space-3xl);
}

.tech-progression__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.tech-progression__item.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.tech-progression__label {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  color: var(--color-text);
  padding: var(--space-sm) var(--space-xl);
  border: 1px solid var(--color-border);
  border-radius: 3px;
  background-color: var(--color-white);
  text-align: center;
  min-width: 220px;
  transition: border-color var(--transition-base), color var(--transition-base);
}

.tech-progression__item:hover .tech-progression__label {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.tech-progression__item--final .tech-progression__label {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-white);
}

.tech-progression__arrow {
  font-size: var(--text-sm);
  color: var(--color-text-light);
  padding: var(--space-xs) 0;
}

.tech__body {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
}

.tech__body p {
  font-size: var(--text-md);
  color: var(--color-text-muted);
  line-height: 1.8;
}

/* ===========================================
   RESEARCH
   =========================================== */
.research {
  padding: var(--space-5xl) 0;
  background-color: var(--color-bg-warm);
}

.research__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  margin-bottom: var(--space-3xl);
}

.research__label {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-earth);
  margin-bottom: var(--space-lg);
  font-weight: 600;
}

.research__list li {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border-light);
}

.research__list li:last-child {
  border-bottom: none;
}

.research__links li {
  margin-bottom: var(--space-sm);
}

.research__link {
  font-size: var(--text-base);
  color: var(--color-text);
  transition: color var(--transition-fast);
}

.research__link:hover {
  color: var(--color-accent);
}

.research__pending {
  font-size: var(--text-sm);
  color: var(--color-text-light);
  font-style: italic;
}

.research__counts {
  display: flex;
  justify-content: center;
  gap: var(--space-4xl);
  flex-wrap: wrap;
}

.research__stat {
  text-align: center;
}

.research__stat-number {
  display: block;
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
}

.research__stat-label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

/* ===========================================
   RESPONSIBLE AI
   =========================================== */
.responsible-ai {
  padding: var(--space-5xl) 0;
}

.rai__concepts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-xl);
}

.rai__concept {
  padding: var(--space-xl);
  border: 1px solid var(--color-border-light);
  border-radius: 4px;
  background-color: var(--color-white);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.rai__concept:hover {
  border-color: var(--color-accent-subtle);
  box-shadow: var(--shadow-sm);
}

.rai__concept h3 {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: 400;
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}

.rai__concept p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ===========================================
   PURPOSE / IMPACT
   =========================================== */
.purpose {
  padding: var(--space-5xl) 0;
  background-color: var(--color-bg-warm);
}

.purpose__themes {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
}

.purpose__theme {
  padding: var(--space-xl);
  border-left: 2px solid var(--color-accent-subtle);
  transition: border-color var(--transition-base);
}

.purpose__theme:hover {
  border-left-color: var(--color-accent);
}

.purpose__theme h3 {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: 400;
  margin-bottom: var(--space-sm);
}

.purpose__theme p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ===========================================
   ECOSYSTEM
   =========================================== */
.ecosystem {
  padding: var(--space-5xl) 0;
}

.ecosystem__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
}

.ecosystem__item {
  padding: var(--space-xl);
  border: 1px solid var(--color-border-light);
  border-radius: 4px;
  background-color: var(--color-white);
  transition: box-shadow var(--transition-base);
}

.ecosystem__item:hover {
  box-shadow: var(--shadow-md);
}

.ecosystem__item h3 {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: 400;
  margin-bottom: var(--space-sm);
}

.ecosystem__item p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.ecosystem__status {
  font-size: var(--text-xs);
  color: var(--color-earth);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-weight: 500;
}

/* ===========================================
   ABOUT
   =========================================== */
.about {
  padding: var(--space-5xl) 0;
  background-color: var(--color-bg-warm);
}

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
}

.about__bio p {
  font-size: var(--text-md);
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: var(--space-xl);
}

.about__slot {
  margin-bottom: var(--space-xl);
}

.about__slot h3 {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-earth);
  margin-bottom: var(--space-sm);
  font-weight: 600;
}

.about__slot p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
}

.about__links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.about__links li {
  margin-bottom: var(--space-xs);
}

.about__links a {
  font-size: var(--text-base);
  color: var(--color-text);
  transition: color var(--transition-fast);
}

.about__links a:hover {
  color: var(--color-accent);
}

.about__details .about__slot p {
  font-style: italic;
  color: var(--color-text-light);
}

/* ===========================================
   FOOTER
   =========================================== */
.site-footer {
  padding: var(--space-4xl) 0 var(--space-xl);
  border-top: 1px solid var(--color-border-light);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: var(--space-3xl);
  margin-bottom: var(--space-3xl);
}

.footer__logo {
  font-family: var(--font-sans);
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
}

.footer__tagline {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.footer__heading {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text);
  margin-bottom: var(--space-lg);
  font-weight: 600;
}

.footer__list li {
  margin-bottom: var(--space-sm);
}

.footer__link {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-accent);
}

.footer__pending {
  font-size: var(--text-xs);
  color: var(--color-text-light);
  font-style: italic;
}

.footer__bottom {
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border-light);
  text-align: center;
}

.footer__bottom p {
  font-size: var(--text-sm);
  color: var(--color-text-light);
}

/* ===========================================
   EDUCATION / ACADEMIC FOUNDATION
   =========================================== */
.education {
  padding: var(--space-5xl) 0;
}

.education__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: var(--space-xl);
}

.education__card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-lg);
  padding: var(--space-xl);
  border: 1px solid var(--color-border-light);
  border-radius: 4px;
  background-color: var(--color-white);
  transition: box-shadow var(--transition-base);
}

.education__card:hover {
  box-shadow: var(--shadow-md);
}

.education__logo {
  flex-shrink: 0;
  width: 70px;
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-bg);
  border-radius: 6px;
  overflow: hidden;
}

.education__logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.education__details h3 {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-xs);
  color: var(--color-text);
}

.education__details p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: var(--space-xs);
}

.education__dates {
  font-size: var(--text-xs);
  color: var(--color-text-light);
  letter-spacing: 0.02em;
}

/* ===========================================
   ASSOCIATIONS — LOGO STRIP
   =========================================== */
.associations {
  padding: var(--space-3xl) 0;
  background-color: var(--color-bg-warm);
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
}

.associations__label {
  text-align: center;
  font-size: var(--text-xs);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-light);
  margin-bottom: var(--space-xl);
}

.associations__strip {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-3xl);
  flex-wrap: wrap;
}

.associations__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  opacity: 0.7;
  transition: opacity var(--transition-base);
}

.associations__item:hover {
  opacity: 1;
}

.associations__item img {
  width: 48px;
  height: 48px;
  object-fit: contain;
}

.associations__item span {
  font-size: var(--text-xs);
  color: var(--color-text-light);
  text-align: center;
  max-width: 100px;
  line-height: 1.3;
}

/* About section education list */
.about__education {
  list-style: none;
  padding: 0;
  margin: 0;
}

.about__education li {
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border-light);
}

.about__education li:last-child {
  border-bottom: none;
}

.about__education strong {
  display: block;
  font-size: var(--text-base);
  color: var(--color-text);
  margin-bottom: 2px;
}

.about__education span {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.about__dates {
  color: var(--color-text-light) !important;
  font-size: var(--text-xs) !important;
}

/* Research stat links */
.research__stat-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.research__stat-link:hover .research__stat-number {
  color: var(--color-earth);
}

.research__stat-link:hover .research__stat-label {
  color: var(--color-accent);
}

.research__stat-link .research__stat-number {
  font-size: var(--text-2xl);
  color: var(--color-accent);
  transition: color var(--transition-fast);
}

.research__stat-link .research__stat-label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

/* ===========================================
   SCROLL ANIMATIONS
   =========================================== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===========================================
   RESPONSIVE — TABLET
   =========================================== */
@media (max-width: 900px) {
  .research__grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .about__grid {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
  }

  .footer__brand {
    grid-column: 1 / -1;
  }
}

/* ===========================================
   RESPONSIVE — MOBILE
   =========================================== */
@media (max-width: 680px) {
  :root {
    --nav-height: 56px;
  }

  .nav__toggle {
    display: flex;
  }

  .nav__menu {
    position: fixed;
    top: 0;
    right: 0;
    width: 280px;
    height: 100vh;
    background-color: var(--color-bg);
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    padding: calc(var(--nav-height) + var(--space-xl)) var(--space-xl) var(--space-xl);
    gap: var(--space-lg);
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    box-shadow: -4px 0 20px rgba(0,0,0,0.08);
    z-index: 999;
  }

  .nav__menu.is-open {
    transform: translateX(0);
  }

  .nav__link {
    font-size: var(--text-md);
  }

  .nav__link--cta {
    margin-top: var(--space-md);
  }

  .hero {
    padding-top: calc(var(--nav-height) + var(--space-2xl));
    min-height: 90vh;
  }

  .hero__title {
    font-size: var(--text-3xl);
  }

  .hero__actions {
    flex-direction: column;
    align-items: center;
  }

  .timeline {
    padding-left: 30px;
  }

  .timeline::before {
    left: 8px;
  }

  .timeline__marker {
    left: -24px;
  }

  .tech-progression__label {
    min-width: 180px;
    font-size: var(--text-base);
  }

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

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

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

  .research__counts {
    gap: var(--space-2xl);
  }

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

  .education__card {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .associations__strip {
    gap: var(--space-xl);
  }

  .associations__item span {
    max-width: 80px;
    font-size: 0.65rem;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
}

/* ===========================================
   PRINT STYLES
   =========================================== */
@media print {
  .site-header,
  .nav__toggle,
  .hero__visual {
    display: none;
  }

  body {
    font-size: 12pt;
    color: #000;
    background: #fff;
  }

  .hero {
    min-height: auto;
    padding: 2rem 0;
  }
}