:root {
  --navy: #07345d;
  --blue: #0a578a;
  --light-blue: #e8f1f7;
  --page: #dce9f2;
  --card: #ffffff;
  --off-white: #f7f5ef;
  --text: #1f2b35;
  --muted: #5c6c78;
  --border: #c7d7e2;
  --accent: #a8242d;
  --shadow: 0 8px 22px rgba(10, 54, 88, 0.14);
  --inset-shadow:
    inset 0 2px 7px rgba(32, 57, 74, 0.17),
    0 1px 0 rgba(255, 255, 255, 0.8);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background:
    linear-gradient(135deg, rgba(255,255,255,.45), transparent 45%),
    var(--page);
}

a {
  color: var(--blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover,
a:focus {
  color: var(--accent);
}

.container {
  width: min(1160px, calc(100% - 2.4rem));
  margin: 0 auto;
}

/* Kopfbereich */

.site-header {
  color: white;
  background:
    linear-gradient(120deg, rgba(4, 35, 64, .94), rgba(10, 87, 138, .88)),
    var(--navy);
  border-bottom: 5px solid var(--accent);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  min-height: 128px;
  padding: 1.5rem 0;
}

.site-title {
  margin: 0;
  color: white;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: normal;
  letter-spacing: .01em;
}

.site-subtitle {
  margin: .35rem 0 0;
  color: #e7f3fb;
  font-size: 1.08rem;
}

.site-subtitle strong {
  color: white;
}

.language-note {
  margin: 0;
  color: #dceefa;
  font-size: .9rem;
  text-align: right;
}

/* Navigation */

.navigation {
  background: #fff;
  border-bottom: 1px solid var(--border);
  box-shadow: 0 3px 8px rgba(5, 45, 77, .08);
}

.navigation ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0;
  padding: 0;
  margin: 0;
  list-style: none;
}

.navigation a {
  display: block;
  padding: .9rem 1.15rem;
  color: var(--navy);
  font-weight: bold;
  text-decoration: none;
}

.navigation a:hover,
.navigation a:focus,
.navigation a.active {
  color: white;
  background: var(--blue);
}

/* Allgemeine Bereiche */

main {
  padding: 2.6rem 0 3.5rem;
}

h1, h2, h3 {
  color: var(--navy);
}

h2 {
  margin: 0 0 1rem;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.8rem;
  font-weight: normal;
}

h3 {
  margin-top: 1.8rem;
  margin-bottom: .55rem;
  font-size: 1.15rem;
}

.card {
  padding: 1.8rem;
  margin-bottom: 1.8rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow);
}

.card p:first-of-type {
  margin-top: 0;
}

/* Hauptseite: Vorstellung */

.hero {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 2.2rem;
  align-items: center;
  padding: 2rem;
  margin-bottom: 2rem;
  background: rgba(255, 255, 255, .9);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.profile-photo {
  display: block;
  width: 100%;
  max-width: 280px;
  aspect-ratio: 1 / 1.08;
  object-fit: cover;
  object-position: center top;
  border: 6px solid white;
  border-radius: 8px;
  box-shadow: 0 5px 16px rgba(0, 0, 0, .25);
}

.hero h2 {
  margin-bottom: .5rem;
  font-size: 2rem;
}

.position {
  margin-top: 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.interests {
  padding-left: 1.2rem;
  margin-bottom: 0;
}

.interests li {
  margin-bottom: .28rem;
}

/* News: optisch vertieft */

.news-box {
  padding: 1.7rem 1.9rem;
  margin: 2rem 0;
  color: #30363a;
  background: var(--off-white);
  border: 1px solid #d5d0c6;
  border-radius: 10px;
  box-shadow: var(--inset-shadow);
}

.news-box h2 {
  margin-bottom: .8rem;
  color: var(--navy);
}

.news-box ul {
  padding-left: 1.3rem;
  margin: 0;
}

.news-box li {
  padding: .65rem 0;
  border-bottom: 1px solid #ddd8ce;
}

.news-box li:last-child {
  border-bottom: 0;
}

.news-date {
  display: inline-block;
  min-width: 6rem;
  color: var(--muted);
  font-weight: bold;
}

/* Kontakt */

.contact-grid {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 2rem;
}

.contact-list {
  margin: 0;
}

.contact-list div {
  display: grid;
  grid-template-columns: 115px 1fr;
  gap: .7rem;
  padding: .55rem 0;
  border-bottom: 1px solid var(--border);
}

.contact-list dt {
  color: var(--muted);
  font-weight: bold;
}

.contact-list dd {
  margin: 0;
}

/* Formular */

label {
  display: block;
  margin-top: .9rem;
  color: var(--navy);
  font-weight: bold;
}

input,
textarea {
  width: 100%;
  margin-top: .25rem;
  padding: .7rem;
  color: var(--text);
  background: white;
  border: 1px solid #aebfcd;
  border-radius: 5px;
  font: inherit;
}

textarea {
  min-height: 130px;
  resize: vertical;
}

button,
.button {
  display: inline-block;
  padding: .72rem 1.1rem;
  margin-top: 1rem;
  color: white;
  background: var(--navy);
  border: 0;
  border-radius: 5px;
  font: inherit;
  font-weight: bold;
  text-decoration: none;
  cursor: pointer;
}

button:hover,
button:focus,
.button:hover,
.button:focus {
  color: white;
  background: var(--accent);
}

.hint {
  color: var(--muted);
  font-size: .9rem;
}

/* Inhaltsseiten */

.page-heading {
  margin-bottom: 1.5rem;
}

.page-heading h1 {
  margin-bottom: .3rem;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2.25rem;
  font-weight: normal;
}

.page-heading p {
  margin: 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.publication-list,
.course-list {
  padding-left: 1.25rem;
}

.publication-list li,
.course-list li {
  margin-bottom: .85rem;
}

.meta {
  color: var(--muted);
}

.back-link {
  margin-top: 2rem;
}

/* Fußbereich */

footer {
  padding: 1.4rem 0;
  color: #dbeaf4;
  background: #203746;
  font-size: .92rem;
}

footer p {
  margin: 0;
}

footer a {
  color: white;
}

/* Kleine Bildschirme */

@media (max-width: 760px) {
  .header-content,
  .hero,
  .contact-grid {
    display: block;
  }

  .header-content {
    padding: 1.5rem 0;
  }

  .language-note {
    margin-top: .8rem;
    text-align: left;
  }

  .hero {
    padding: 1.4rem;
  }

  .profile-photo {
    max-width: 240px;
    margin: 0 auto 1.6rem;
  }

  .contact-grid > div + div {
    margin-top: 2rem;
  }
}

@media (max-width: 500px) {
  .container {
    width: min(100% - 1.4rem, 1160px);
  }

  .navigation a {
    padding: .75rem .7rem;
    font-size: .92rem;
  }

  .card,
  .news-box {
    padding: 1.25rem;
  }

  .contact-list div {
    grid-template-columns: 1fr;
    gap: .1rem;
  }
}