* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #1a4c39;
  --primary-light: rgba(26, 76, 57, 0.1);
  --primary-hover: #143b2c;
  --dark: #121212;
  --gray-900: #121212;
  --gray-600: #4b5650;
  --gray-500: #707070;
  --gray-400: #8d9690;
  --gray-200: #e5e9e6;
  --gray-100: #f4f6f4;
  --white: #ffffff;
  --bg: #efe9de;
}

body {
  font-family: "Inter", sans-serif;
  background-color: var(--bg);
  color: var(--gray-900);
  line-height: 1.6;
  overflow-x: hidden;
  width: 100%;
  padding-top: 84px;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

@media (min-width: 768px) {
  .container {
    padding: 0 48px;
  }
}

.site-header {
  position: fixed;
  top: 0;
  width: 100%;
  background-color: var(--white);
  border-bottom: 1px solid var(--gray-200);
  z-index: 1000;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0;
}

.logo {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.nav-links {
  display: flex;
  gap: 24px;
  align-items: center;
}

.nav-links a {
  color: var(--gray-400);
  text-decoration: none;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transition: color 0.3s ease;
  position: relative;
  padding-bottom: 6px;
}

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

.nav-links a.is-active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--primary);
}

.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  border: 1px solid var(--gray-200);
  background: var(--white);
  border-radius: 10px;
  padding: 8px;
  gap: 4px;
}

.hamburger span {
  width: 22px;
  height: 2px;
  background-color: var(--primary);
  transition: 0.3s;
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    left: -100%;
    top: 70px;
    flex-direction: column;
    background-color: var(--white);
    width: 100%;
    text-align: center;
    transition: 0.3s;
    padding: 20px 0;
    gap: 0;
    border-bottom: 1px solid var(--gray-200);
  }

  .nav-links.is-open {
    left: 0;
  }

  .nav-links a {
    display: block;
    padding: 15px;
    margin: 0;
  }

  .hamburger {
    display: flex;
  }

  .hamburger.active span:nth-child(2) {
    opacity: 0;
  }

  .hamburger.active span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
  }

  .hamburger.active span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
  }
}

.hero {
  padding: 80px 0;
  text-align: center;
  padding-top: 100px;
}

.section-label {
  font-size: 0.75rem;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-weight: 600;
}

.section-title {
  font-size: clamp(2rem, 3vw, 3.4rem);
  font-weight: 400;
  margin-top: 8px;
  margin-bottom: 24px;
}

.hero-description {
  font-size: 1.1rem;
  color: var(--gray-600);
  font-weight: 300;
  max-width: 700px;
  margin: 0 auto 48px;
  line-height: 1.8;
}

.research-grid {
  display: grid;
  gap: 48px;
  margin-top: 64px;
}

@media (min-width: 768px) {
  .research-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 64px;
  }
}

.research-category {
  background-color: var(--white);
  border: 1px solid var(--gray-200);
  padding: 32px;
  border-radius: 4px;
  transition: all 0.3s ease;
}

.research-category:hover {
  border-color: var(--primary);
  box-shadow: 0 10px 30px rgba(18, 18, 18, 0.08);
}

.category-icon {
  width: 56px;
  height: 56px;
  background-color: var(--primary-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.category-icon svg {
  width: 24px;
  height: 24px;
  color: var(--primary);
}

.category-title {
  font-size: 1.5rem;
  font-weight: 500;
  margin-bottom: 16px;
  text-align: left;
}

.category-description {
  color: var(--gray-500);
  margin-bottom: 24px;
  line-height: 1.7;
  text-align: left;
}

.research-list {
  list-style: none;
}

.research-list li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  color: var(--gray-600);
  font-weight: 300;
  margin-bottom: 16px;
}

.research-list li::before {
  content: "";
  width: 6px;
  height: 6px;
  background-color: var(--primary);
  border-radius: 50%;
  margin-top: 8px;
  flex-shrink: 0;
}

.publications {
  background-color: var(--gray-100);
  padding: 64px 0;
  margin: 96px 0;
  overflow-x: hidden;
  width: 100%;
}

.publications-subtitle {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--primary);
  margin: 32px 0 16px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.publications-list {
  list-style: none;
  display: grid;
  gap: 16px;
  margin-top: 40px;
  width: 100%;
  max-width: 100%;
}

.publications-subtitle + .publications-list {
  margin-top: 0;
}

.publications-list li {
  border: 1px solid var(--gray-200);
  background-color: var(--white);
  padding: 16px 20px;
  border-radius: 999px;
  color: var(--gray-600);
  line-height: 1.7;
  transition: border-color 0.3s ease, color 0.3s ease;
  word-wrap: break-word;
  overflow-wrap: break-word;
  hyphens: auto;
  width: 100%;
  max-width: 100%;
}

.publications-list em {
  font-style: normal;
  font-weight: 600;
  color: var(--gray-900);
  word-wrap: break-word;
  overflow-wrap: break-word;
  hyphens: auto;
}

.publications-list li:hover {
  border-color: var(--primary);
}

@media (max-width: 767px) {
  .publications-list li {
    padding: 14px 18px;
    font-size: 0.875rem;
    line-height: 1.6;
    border-radius: 16px;
  }

  .publications-list em {
    display: block;
    margin-bottom: 4px;
  }
}

@media (min-width: 768px) {
  .publications-list li {
    padding: 18px 28px;
  }
}

footer {
  border-top: 1px solid var(--gray-200);
  padding: 32px 0;
  text-align: center;
}

.copyright {
  color: var(--gray-500);
  font-size: 0.875rem;
}

.social-links {
  display: flex;
  gap: 24px;
  justify-content: center;
}

.social-link {
  color: var(--gray-400);
  transition: color 0.3s ease;
}

.social-link:hover {
  color: var(--primary);
}

.icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}