html {
  scroll-behavior: smooth;
}

/* === BASE === */
body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  color: #000;
  background-color: #fff;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  box-sizing: border-box;
}

/* === CONTAINER für Header + Main === */
.content-container {
  width: 100%;
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 40px;
  box-sizing: border-box;
}

/* === HEADER === */
header {
  background-color: #fff;
  padding: 20px 0;
  border-bottom: 1px solid #eee;
  box-shadow: 0 1px 4px rgba(0,0,0,0.05);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
}

.site-name {
  font-size: 20px;
  font-weight: bold;
}

/* === NAVIGATION === */
.nav-menu {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin: 0;
  padding: 0;
}

.nav-menu li a {
  text-decoration: none;
  color: #000;
  font-size: 15px;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-menu li a:hover,
.nav-menu li a.active {
  color: #d90c1a;
}

/* === MAIN === */
main {
  flex: 1;
  padding: 40px 0;
  text-align: left;
  box-sizing: border-box;
}

/* === HEADINGS === */
h1 {
  font-size: 24px;
  margin-bottom: 10px;
  color: #000;
}

.intro {
  font-size: 16px;
  margin-bottom: 32px;
  color: #222;
}

/* === TILE GRID === */
.tile-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  gap: 24px;
}

/* === TILE === */
.tile-wrapper {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 260px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  height: 100%;
}

.tile-wrapper:hover {
  transform: translateY(-6px);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.2);
}

.tile-image-top {
  height: 200px;
  background-color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tile-image-top img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.tile-image1 {
  background-color: #84ee12;
  padding: 16px;
  text-align: left;
  text-decoration: none;
  color: #2A3132;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  flex-grow: 1;
  min-height: 140px;
}

.tile-image1 h2 {
  font-size: 16px;
  font-weight: bold;
  margin: 0 0 8px 0;
}

.tile-image1 p {
  font-size: 14px;
  margin: 0 0 6px 0;
  color: #2A3132;
  line-height: 1.3;
}

.tile-image2 {
  background-image: url('image2.jpg');
  background-size: cover;
  background-position: center;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2),
              0 4px 8px rgba(0, 0, 0, 0.1);
}

/* === FOOTER === */
footer {
  background-color: #fff;
  color: #444;
  font-size: 13px;
  text-align: center;
  padding: 20px 10px;
  border-top: 1px solid #eee;
  margin-top: auto;
}

footer a {
  color: #3a3aff;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

/* === RESPONSIVE === */
@media (max-width: 768px) {
  .content-container {
    padding: 0 20px;
  }

  main {
    padding-left: 0;
    padding-right: 0;
  }

  h1 {
    font-size: 20px;
    text-align: center;
  }

  .nav-menu {
    flex-direction: column;
    gap: 10px;
    align-items: flex-start;
    margin-top: 10px;
  }

  .tile-grid {
    flex-direction: column;
    align-items: center;
    gap: 32px;
  }

  .tile-wrapper {
    width: 100%;
    max-width: 90%;
  }

  .tile-image1 h2 {
    font-size: 15px;
  }

  .tile-image1 p {
    font-size: 13px;
  }

  .pub-nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

/* === ABOUT SITE CARD === */
.about-card {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  background-color: #f9f9f9;
  border-radius: 20px;
  padding: 40px 30px;
  gap: 40px;
  box-shadow: 0 20px 24px rgba(0,0,0,0.1);
  margin-bottom: 60px;
}

.about-photo img {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  margin-top: 2px;
  object-fit: cover;
  border: 4px solid #eee;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.about-text {
  flex: 1;
  min-width: 240px;
}

.about-text h1 {
  font-size: 24px;
  margin-bottom: 16px;
  color: #000;
}

.about-text p {
  font-size: 16px;
  line-height: 1.6;
  color: #222;
  margin-bottom: 16px;
}

/* ===  EMAIL UND LINKS === */
.scholar-link {
  color: #d90c1a;
  text-decoration: none;
  font-weight: 500;
}

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

.contact-links {
  font-size: 15px;
}

.scholar-link,
.scholar-link:visited,
.scholar-link:hover,
.scholar-link:active {
  color: #d90c1a;
  text-decoration: none;
  font-weight: 500;
}

.scholar-link {
  color: #d90c1a;
  text-decoration: none;
  font-weight: 500;
}


/* === PUBLICATIONS === */
.publication-section {
  margin-top: 80px;
  padding-top: 40px;
  border-top: 1px solid #ddd;
}

.publication-section h2 {
  font-size: 24px;
  margin-bottom: 24px;
  color: #000;
}

.pub-category {
  margin-bottom: 40px;
}

.pub-category h3 {
  font-size: 20px;
  margin-bottom: 12px;
  color: #333;
}

.pub-category ul {
  list-style: none;
  padding-left: 0;
}

.pub-category li {
  margin-bottom: 16px;
  font-size: 15px;
  line-height: 1.5;
  color: #222;
}

.pub-category a {
  color: #d90c1a;
  text-decoration: none;
  font-weight: 500;
}

.pub-category a:hover {
  text-decoration: underline;
}

/* === PUB NAVIGATION === */
.pub-nav {
  background-color: #f9f9f9;
  padding: 16px 20px;
  margin-bottom: 40px;
  border: 1px solid #eee;
  border-radius: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 15px;
  position: sticky;
  top: 80px;
  z-index: 50;
}

.pub-nav strong {
  margin-right: 10px;
  color: #000;
}

.pub-nav a {
  color: #d90c1a;
  text-decoration: none;
  padding: 4px 8px;
  background-color: #fff;
  border: 1px solid #d90c1a33;
  border-radius: 6px;
  transition: background 0.2s ease;
}

.pub-nav a:hover {
  background-color: #d90c1a10;
  text-decoration: underline;
}

.pub-filter {
  margin-bottom: 20px;
  display: flex;
  gap: 12px;
}

.pub-filter button {
  padding: 6px 14px;
  border: 1px solid #d90c1a33;
  background-color: #fff;
  color: #d90c1a;
  border-radius: 6px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s ease;
}

.pub-filter button:hover {
  background-color: #d90c1a10;
}

.pub-filter button.active {
  background-color: #d90c1a10;
  border-color: #d90c1a66;
  color: #d90c1a;
}

#publications-container {
  margin-top: 20px;
}

.pub-group {
  margin-top: 32px;
  font-size: 20px;
  color: #333;
}

.pub-item {
  margin-bottom: 16px;
  font-size: 15px;
  line-height: 1.5;
}

.pub-link {
  margin-left: 8px;
  font-weight: 500;
  color: #d90c1a;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-bottom 0.2s ease;
}

.pub-link:hover {
  color: #a60a0a;
  border-bottom: 1px solid #a60a0a;
}