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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Merriweather', serif;
  background-color: var(--color-background);
  color: var(--color-text);
  line-height: 1.7;
  overflow-x: hidden;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
}

input, button, textarea, select {
  font: inherit;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Lato', sans-serif;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-heading);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

ul {
  list-style: none;
}

p {
  margin-bottom: 1rem;
}

/* ----------------------- */
/* --- CSS VARIABLES --- */
/* ----------------------- */
:root {
  --color-primary: #2c3e50; /* Muted Blue/Grey */
  --color-primary-dark: #1a2530;
  --color-secondary: #bdc3c7; /* Light Grey */
  --color-accent: #e0e0d1; /* Cream */
  --color-background: #fdfdfb;
  --color-surface: #ffffff;
  --color-text: #505050;
  --color-heading: #2c3e50;
  --font-primary: 'Lato', sans-serif;
  --font-secondary: 'Merriweather', serif;
  --spacing-xs: 0.25rem;
  --spacing-s: 0.5rem;
  --spacing-m: 1rem;
  --spacing-l: 1.5rem;
  --spacing-xl: 2.5rem;
  --spacing-xxl: 4rem;
  --section-padding: clamp(4rem, 8vw, 6rem);
  --border-radius: 8px;
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
  --shadow-md: 0 5px 15px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.15);
  --transition-speed: 0.3s;
}

/* -------------------------- */
/* --- UTILITY & LAYOUT --- */
/* -------------------------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-l);
}

.section {
  padding: var(--section-padding) 0;
  overflow: hidden;
}

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

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

.section-title {
  font-size: clamp(2rem, 5vw, 2.75rem);
  margin-bottom: var(--spacing-s);
  position: relative;
  padding-bottom: var(--spacing-m);
}

.section-title::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background-color: var(--color-primary);
}

.section-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--color-text);
  max-width: 700px;
  margin: 0 auto;
  margin-bottom: var(--spacing-xl);
  font-family: var(--font-secondary);
}

.btn {
  display: inline-block;
  padding: 0.8rem 1.8rem;
  background-color: var(--color-primary);
  color: #fff;
  border-radius: var(--border-radius);
  font-family: var(--font-primary);
  font-weight: 700;
  transition: all var(--transition-speed) ease;
  border: 2px solid transparent;
  cursor: pointer;
}

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

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: #fff;
}

/* ------------------- */
/* --- HEADER & NAV --- */
/* ------------------- */
.main-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-speed) ease;
}

.main-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo {
  font-family: var(--font-primary);
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--color-heading);
}
.logo:hover {
  color: var(--color-primary-dark);
}

.nav-links {
  display: flex;
  gap: var(--spacing-l);
}

.nav-links a {
  font-family: var(--font-primary);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
  padding: 0.5rem 0;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-speed) ease-in-out;
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-links a.active {
  color: var(--color-primary);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1001;
}

.mobile-menu-toggle .hamburger {
  display: block;
  width: 25px;
  height: 2px;
  background-color: var(--color-heading);
  position: relative;
  transition: all 0.3s ease;
}

.mobile-menu-toggle .hamburger::before,
.mobile-menu-toggle .hamburger::after {
  content: '';
  position: absolute;
  left: 0;
  width: 25px;
  height: 2px;
  background-color: var(--color-heading);
  transition: all 0.3s ease;
}

.mobile-menu-toggle .hamburger::before { top: -8px; }
.mobile-menu-toggle .hamburger::after { bottom: -8px; }

/* ---------------- */
/* --- HERO SECTION --- */
/* ---------------- */
.hero-split {
  min-height: calc(90vh - 80px);
  display: grid;
  align-items: center;
  gap: var(--spacing-xl);
}

.hero-text { z-index: 2; }

.hero-text .subtitle {
  font-size: 1.25rem;
  font-family: var(--font-primary);
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--color-primary);
  font-weight: 700;
  margin-bottom: var(--spacing-m);
}

.hero-text h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  margin-bottom: var(--spacing-l);
}

.hero-text p {
  font-size: 1.1rem;
  max-width: 55ch;
  margin-bottom: var(--spacing-xl);
  color: var(--color-text);
}

.hero-image-wrapper {
  position: relative;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-image {
  width: 100%;
  height: 100%;
  min-height: 400px;
  object-fit: cover;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  position: relative;
  z-index: 1;
}

.page-header {
  min-height: 40vh;
  background-size: cover;
  background-position: center;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  text-align: center;
}

.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(44, 62, 80, 0.7);
}

.page-header-content {
  position: relative;
  z-index: 1;
}

.page-header h1 {
  font-size: clamp(2.5rem, 6vw, 3.5rem);
  color: white;
}
.page-header p {
  font-size: 1.25rem;
  max-width: 60ch;
  margin: var(--spacing-m) auto 0;
  opacity: 0.9;
}


/* -------------------------- */
/* --- ASYMMETRIC SECTIONS --- */
/* -------------------------- */
.section-asymmetric {
  display: grid;
  grid-template-columns: 1fr;
  align-items: center;
  gap: var(--spacing-xxl);
}

.section-asymmetric .content-block h2 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  margin-bottom: var(--spacing-l);
}

.section-asymmetric .image-block {
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  position: relative;
}

.section-asymmetric .image-block::before {
  content: '';
  display: block;
  padding-bottom: 75%;
}

.section-asymmetric .image-block img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.diagonal-cta {
  background-color: var(--color-primary);
  color: white;
  position: relative;
  margin: var(--section-padding) 0;
  padding: 8rem 0;
}

.diagonal-cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-background);
  transform: skewY(-4deg);
  transform-origin: top left;
  z-index: -1;
}

.diagonal-cta::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-background);
  transform: skewY(4deg);
  transform-origin: bottom right;
  z-index: -1;
}

.diagonal-cta-content h2 {
  color: white;
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  margin-bottom: var(--spacing-l);
}

/* -------------------------- */
/* --- CARD & GRID STYLES --- */
/* -------------------------- */
.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-l);
}

.feature-card {
  background-color: var(--color-surface);
  border-radius: var(--border-radius);
  padding: var(--spacing-l);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-speed) ease;
  border: 1px solid #eaeaea;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.feature-card .icon {
  font-size: 2.5rem;
  color: var(--color-primary);
  margin-bottom: var(--spacing-m);
}

.feature-card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-s);
}

.publications-grid {
    display: grid;
    gap: var(--spacing-l);
    grid-template-columns: 1fr;
}

.publication-card {
    background-color: var(--color-surface);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: box-shadow var(--transition-speed) ease;
}

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

.publication-card img {
    height: 220px;
    width: 100%;
    object-fit: cover;
}

.publication-content {
    padding: var(--spacing-l);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.publication-content .category {
    font-family: var(--font-primary);
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--color-primary);
    text-transform: uppercase;
    margin-bottom: var(--spacing-s);
}

.publication-content h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-m);
    flex-grow: 1;
}

.publication-content .read-more {
    font-family: var(--font-primary);
    font-weight: 700;
    color: var(--color-primary);
}

.publication-content .read-more:hover {
    text-decoration: underline;
}

/* ------------------- */
/* --- TIMELINE --- */
/* ------------------- */
.timeline {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
}

.timeline::after {
    content: '';
    position: absolute;
    width: 4px;
    background-color: var(--color-accent);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -2px;
}

.timeline-item {
    padding: 10px 40px;
    position: relative;
    background-color: inherit;
    width: 50%;
}

.timeline-item::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    right: -12px;
    background-color: var(--color-surface);
    border: 4px solid var(--color-primary);
    top: 25px;
    border-radius: 50%;
    z-index: 1;
}

.timeline-item.left {
    left: 0;
}

.timeline-item.right {
    left: 50%;
}

.timeline-item.left::before {
    content: " ";
    height: 0;
    position: absolute;
    top: 28px;
    width: 0;
    z-index: 1;
    right: 30px;
    border: medium solid white;
    border-width: 10px 0 10px 10px;
    border-color: transparent transparent transparent var(--color-surface);
}

.timeline-item.right::before {
    content: " ";
    height: 0;
    position: absolute;
    top: 28px;
    width: 0;
    z-index: 1;
    left: 30px;
    border: medium solid white;
    border-width: 10px 10px 10px 0;
    border-color: transparent var(--color-surface) transparent transparent;
}


.timeline-item.right::after {
    left: -10px;
}

.timeline-content {
    background-color: var(--color-surface);
    position: relative;
    border-radius: var(--border-radius);
    padding: var(--spacing-l);
    box-shadow: var(--shadow-sm);
    border: 1px solid #eaeaea;
}
.timeline-content h3 {
    font-size: 1.25rem;
    color: var(--color-primary);
}

.timeline-content .date {
    font-family: var(--font-primary);
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: var(--spacing-s);
}

/* ------------------- */
/* --- FOOTER --- */
/* ------------------- */
.main-footer {
  background-color: var(--color-primary-dark);
  color: var(--color-secondary);
  padding: var(--section-padding) 0;
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--spacing-xxl);
}

.footer-about .logo {
  color: #fff;
  font-size: 1.8rem;
  margin-bottom: var(--spacing-m);
  display: inline-block;
}
.footer-about p {
  max-width: 45ch;
}
.footer-col h4 {
  color: #fff;
  font-size: 1.1rem;
  margin-bottom: var(--spacing-l);
  font-family: var(--font-primary);
}

.footer-links li {
  margin-bottom: var(--spacing-s);
}
.footer-links a {
  color: var(--color-secondary);
  transition: all var(--transition-speed) ease;
}
.footer-links a:hover {
  color: #fff;
  padding-left: 5px;
}

.footer-bottom {
  margin-top: var(--spacing-xxl);
  padding-top: var(--spacing-l);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
}

/* ------------------- */
/* --- COOKIE BANNER --- */
/* ------------------- */
#cookie-banner {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: rgba(26, 37, 48, 0.95);
  color: white;
  padding: var(--spacing-l);
  z-index: 9999;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-l);
  backdrop-filter: blur(5px);
  font-size: 0.9rem;
}

#cookie-banner p {
  margin: 0;
}

#cookie-banner .cookie-buttons {
  display: flex;
  gap: var(--spacing-m);
  flex-shrink: 0;
}

#cookie-banner button {
  padding: 0.6rem 1.2rem;
  border-radius: var(--border-radius);
  border: none;
  cursor: pointer;
  font-weight: 700;
  transition: background-color var(--transition-speed) ease;
}

#cookie-banner #accept-cookies {
  background-color: var(--color-accent);
  color: var(--color-primary-dark);
}
#cookie-banner #accept-cookies:hover {
  background-color: #f1f1e5;
}

#cookie-banner #decline-cookies {
  background-color: transparent;
  color: var(--color-secondary);
  border: 1px solid var(--color-secondary);
}
#cookie-banner #decline-cookies:hover {
  background-color: var(--color-secondary);
  color: var(--color-primary-dark);
}

/* ------------------- */
/* --- RESPONSIVE --- */
/* ------------------- */
@media (max-width: 992px) {
  .hero-split {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-text p {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-image-wrapper {
    order: -1;
    margin-bottom: var(--spacing-l);
  }
  footer-grid {
      grid-template-columns: 1fr;
  }
}

@media (min-width: 768px) {
    .section-asymmetric {
        grid-template-columns: 1fr 1fr;
    }
    .section-asymmetric.reverse {
        grid-template-columns: 1fr 1fr;
    }
    .section-asymmetric.reverse .image-block {
        order: -1;
    }
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .publications-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .hero-split {
        grid-template-columns: 3fr 2fr;
    }
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .publications-grid {
        grid-template-columns: repeat(3, 1fr);
    }
     .section-asymmetric {
        grid-template-columns: 2fr 1fr;
    }
    .section-asymmetric.reverse {
        grid-template-columns: 1fr 2fr;
    }
}


@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 60%;
    height: 100vh;
    flex-direction: column;
    background-color: var(--color-surface);
    padding: 80px var(--spacing-l) var(--spacing-l);
    gap: var(--spacing-m);
    transition: right 0.4s ease-in-out;
    box-shadow: -5px 0 15px rgba(0,0,0,0.1);
  }
  .nav-links.active {
    right: 0;
  }
  .mobile-menu-toggle {
    display: block;
  }
  .mobile-menu-toggle.active .hamburger {
    background-color: transparent;
  }
  .mobile-menu-toggle.active .hamburger::before {
    transform: rotate(45deg) translate(5px, 6px);
  }
  .mobile-menu-toggle.active .hamburger::after {
    transform: rotate(-45deg) translate(5px, -6px);
  }
  .timeline::after {
        left: 31px;
    }
    .timeline-item {
        width: 100%;
        padding-left: 70px;
        padding-right: 25px;
    }
    .timeline-item::before {
        left: 60px;
        border: medium solid white;
        border-width: 10px 10px 10px 0;
        border-color: transparent white transparent transparent;
    }
    .timeline-item.left::after, .timeline-item.right::after {
        left: 20px;
    }
    .timeline-item.right {
        left: 0%;
    }
    #cookie-banner {
      flex-direction: column;
      text-align: center;
    }
    .footer-grid {
      grid-template-columns: 1fr;
      text-align: center;
    }
    .footer-about p {
      margin: 0 auto;
    }
}