:root {
  --color-primary: #1e3a5f;
  --color-accent: #9c7f68;
  --color-accent-light: rgb(20, 40, 66, 0.1);
  --color-text: #2d3436;
  --color-text-light: #636e72;
  --color-bg: #ffffff;
  --color-bg-alt: #f8f9fa;
  --color-border: #e9ecef;
  --font-family: 'Calibri', 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
  --transition: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 8px;
}

.nav-link {
  display: block;
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-light);
  text-decoration: none;
  border-radius: 6px;
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--color-primary);
  background: var(--color-bg-alt);
}

.nav-link-highlight {
  color: var(--color-accent);
}

.nav-link-highlight:hover {
  color: var(--color-accent);
  background: var(--color-accent-light);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: var(--transition);
}

.section {
  padding: 120px 0;
}

.hero-section {
  padding-top: 180px;
  padding-bottom: 140px;
}

.hero-content {
  max-width: 700px;
}

.hero-label {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  margin-bottom: 16px;
  letter-spacing: 0.02em;
}

.hero-title {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 700;
  line-height: 1.15;
  color: var(--color-primary);
  margin-bottom: 24px;
  letter-spacing: -0.03em;
}

.hero-description {
  font-size: 18px;
  color: var(--color-text-light);
  margin-bottom: 32px;
  max-width: 560px;
}

.hero-affiliations {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  color: var(--color-text-light);
}

.divider {
  color: var(--color-border);
}

.section-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: 16px;
  color: var(--color-text-light);
  margin-bottom: 48px;
  max-width: 540px;
}

.section-alt {
  background: var(--color-bg-alt);
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.research-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 32px;
  transition: var(--transition);
}

.research-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
}

.card-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

.card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 12px;
  line-height: 1.4;
}

.card-description {
  font-size: 14px;
  color: var(--color-text-light);
  margin-bottom: 20px;
  line-height: 1.6;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  font-size: 12px;
  font-weight: 500;
  color: var(--color-text-light);
  background: var(--color-bg-alt);
  padding: 4px 10px;
  border-radius: 4px;
}

.projects-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--color-border);
  border-radius: 12px;
  overflow: hidden;
}

.project-item {
  display: grid;
  grid-template-columns: 60px 1fr auto;
  gap: 32px;
  align-items: center;
  padding: 32px;
  background: var(--color-bg);
  transition: var(--transition);
}

.project-item:hover {
  background: var(--color-bg-alt);
}

.project-number {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

.project-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.project-title a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

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

.project-preview {
  margin-top: 16px;
}

.project-image {
  width: 100%;
  height: auto;
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

.project-description {
  font-size: 14px;
  color: var(--color-text-light);
}

.project-type {
  font-size: 12px;
  font-weight: 500;
  color: var(--color-text-light);
  background: var(--color-bg-alt);
  padding: 6px 12px;
  border-radius: 4px;
  white-space: nowrap;
}

.publications-list {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.publication-item {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--color-border);
}

.publication-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.publication-year {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
}

.publication-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
  line-height: 1.5;
}

.publication-authors {
  font-size: 14px;
  color: var(--color-text);
  margin-bottom: 4px;
}

.publication-venue {
  font-size: 14px;
  color: var(--color-text-light);
  font-style: italic;
  margin-bottom: 12px;
}

.publication-links {
  display: flex;
  gap: 16px;
}

.pub-link {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-accent);
  text-decoration: none;
  transition: var(--transition);
}

.pub-link:hover {
  text-decoration: underline;
}

.cv-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 64px;
  margin-bottom: 64px;
}

.cv-heading {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 24px;
}

.cv-item {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 20px;
  margin-bottom: 24px;
}

.cv-period {
  font-size: 13px;
  color: var(--color-text-light);
}

.cv-details h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 2px;
}

.cv-details p {
  font-size: 14px;
  color: var(--color-text-light);
}

.cv-note {
  font-size: 13px !important;
  font-style: italic;
}

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

.btn {
  display: inline-block;
  padding: 14px 28px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  border-radius: 8px;
  transition: var(--transition);
}

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

.btn-primary:hover {
  background: #1a1d1e;
  transform: translateY(-2px);
}

.footer {
  padding: 64px 0;
  border-top: 1px solid var(--color-border);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.footer-text {
  font-size: 16px;
  color: var(--color-text-light);
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  transition: var(--transition);
}

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

.footer-copyright {
  font-size: 13px;
  color: var(--color-text-light);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 24px;
    display: none;
  }

  .nav-menu.active {
    display: flex;
  }

  .nav-link {
    padding: 12px 0;
  }

  .section {
    padding: 80px 0;
  }

  .hero-section {
    padding-top: 140px;
    padding-bottom: 80px;
  }

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

  .project-item {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .project-number {
    order: -1;
  }

  .project-meta {
    justify-self: start;
  }

  .publication-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .publication-year {
    margin-bottom: 4px;
  }

  .cv-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .cv-item {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .footer-content {
    flex-direction: column;
    gap: 24px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 32px;
  }

  .section-title {
    font-size: 26px;
  }

  .research-card {
    padding: 24px;
  }

  .project-item {
    padding: 24px;
  }
}

.detail-hero {
  padding-top: 140px;
  padding-bottom: 20px;
}

.detail-hero + .section {
  padding-top: 20px;
}

.back-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-accent);
  text-decoration: none;
  margin-bottom: 24px;
  transition: var(--transition);
}

.back-link:hover {
  opacity: 0.8;
}

.detail-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 12px;
}

.detail-title {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-primary);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.detail-subtitle {
  font-size: 18px;
  color: var(--color-text-light);
  margin-bottom: 24px;
  max-width: 700px;
}

.detail-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.detail-content {
  max-width: 800px;
}

.detail-content h2 {
  font-size: 22px;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: 40px;
  margin-bottom: 16px;
}

.detail-content h2:first-child {
  margin-top: 0;
}

.detail-content p {
  font-size: 16px;
  color: var(--color-text);
  line-height: 1.8;
  margin-bottom: 16px;
}

.detail-content ul {
  margin-left: 24px;
  margin-bottom: 16px;
}

.detail-content li {
  font-size: 16px;
  color: var(--color-text);
  line-height: 1.8;
  margin-bottom: 8px;
}

.research-card-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.research-card-link .research-card {
  cursor: pointer;
}

.design-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.design-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  overflow: hidden;
  transition: var(--transition);
}

.design-card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
  transform: translateY(-4px);
}

.design-card-link {
  text-decoration: none;
  color: inherit;
  display: block;
}

.design-card-image {
  width: 100%;
  aspect-ratio: 16/10;
  overflow: hidden;
  background: var(--color-bg-alt);
}

.design-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.design-card:hover .design-card-image img {
  transform: scale(1.05);
}

.design-card-content {
  padding: 20px;
}

.design-card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
  line-height: 1.4;
}

.design-card-description {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.5;
}

.see-more-container {
  text-align: center;
  margin-top: 40px;
}

.see-more-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  text-decoration: none;
  padding: 12px 24px;
  border: 2px solid var(--color-accent);
  border-radius: 8px;
  transition: var(--transition);
}

.see-more-link:hover {
  background: var(--color-accent);
  color: white;
}

@media (max-width: 768px) {
  .design-grid {
    grid-template-columns: 1fr;
  }
  
  .detail-hero {
    padding-top: 120px;
  }
}