:root {
  color-scheme: light;
  --bg: #f3f6fb;
  --bg-alt: #ffffff;
  --text: #0f2233;
  --muted: #4f6676;
  --accent: #005aa9;
  --accent-2: #00a0e1;
  --card: #ffffff;
  --border: #d6e1ee;
  --shadow: 0 20px 40px rgba(0, 48, 86, 0.12);
  --radius: 20px;
  --max-width: 1100px;
}

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

body {
  font-family: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

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

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(100% - 48px, var(--max-width));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(247, 246, 251, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
  gap: 24px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.brand-title {
  font-weight: 600;
  font-size: 1.05rem;
}

.brand-subtitle {
  font-size: 0.85rem;
  color: var(--muted);
}

.nav {
  display: flex;
  gap: 18px;
  font-size: 0.95rem;
}

.nav a {
  padding: 6px 10px;
  border-radius: 999px;
  transition: background 0.2s ease, color 0.2s ease;
}

.nav a:hover {
  background: rgba(109, 77, 247, 0.12);
  color: var(--accent);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  gap: 6px;
  flex-direction: column;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 999px;
}

.hero {
  padding: 72px 0 56px;
}

.hero-grid {
  display: grid;
  gap: 40px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  align-items: center;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.75rem;
  color: var(--accent);
  margin-bottom: 12px;
}

h1,
h2,
h3 {
  font-family: "Source Serif 4", "Times New Roman", serif;
  line-height: 1.2;
}

h1 {
  font-size: clamp(2.2rem, 3.5vw, 3rem);
  margin-bottom: 16px;
}

h2 {
  font-size: clamp(1.8rem, 2.8vw, 2.4rem);
  margin-bottom: 16px;
}

h3 {
  font-size: 1.3rem;
  margin-bottom: 8px;
}

.lead {
  font-size: 1.05rem;
  color: var(--muted);
  margin-bottom: 24px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.button {
  padding: 12px 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.button.primary {
  background: var(--accent);
  color: #fff;
  box-shadow: var(--shadow);
}

.button.ghost {
  border-color: var(--border);
  color: var(--text);
  background: #fff;
}

.hero-meta {
  display: grid;
  gap: 16px;
}

.meta-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--muted);
  display: block;
}

.meta-value {
  font-weight: 500;
}

.hero-media {
  display: grid;
  gap: 20px;
}

.portrait-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  display: grid;
  gap: 20px;
}

.portrait-placeholder {
  border-radius: 24px;
  overflow: hidden;
}

.portrait-image {
  width: 100%;
  height: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  display: block;
}

.caption-title {
  font-weight: 600;
  margin-bottom: 6px;
}

.hero-video {
  background: #fff;
  border-radius: var(--radius);
  padding: 18px 20px;
  border: 1px solid var(--border);
}

.video-shell {
  display: flex;
  gap: 16px;
  align-items: center;
}

.video-play {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 600;
}

.video-note {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 12px;
}

.section {
  padding: 72px 0;
}

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

.section-header {
  max-width: 760px;
  margin-bottom: 40px;
}

.timeline {
  display: grid;
  gap: 20px;
}

.timeline-item {
  background: var(--card);
  border-radius: var(--radius);
  padding: 20px 24px;
  border: 1px solid var(--border);
}

.timeline-item.highlight {
  border: 1px solid var(--accent);
  box-shadow: 0 20px 40px rgba(109, 77, 247, 0.15);
}

.timeline-year {
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 8px;
}

.research-grid,
.project-grid,
.teaching-grid,
.publication-cards,
.contact-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.project-grid {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  margin-top: 24px;
}

.focus-card,
.project-card,
.teaching-card,
.publication-card,
.contact-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 22px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.story-card {
  margin-top: 32px;
  display: grid;
  gap: 24px;
  background: var(--card);
  border-radius: var(--radius);
  padding: 26px;
  border: 1px solid var(--border);
}

.story-visual {
  display: grid;
  gap: 8px;
  align-items: start;
}

.small {
  font-size: 0.85rem;
  color: var(--muted);
}

.filter-bar {
  margin-top: 36px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
}

.filter-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.filter-button {
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #fff;
  cursor: pointer;
  font-weight: 500;
}

.filter-button.active {
  background: var(--accent);
  color: #fff;
  border-color: transparent;
}

.project-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 12px;
}

.project-head.is-only {
  justify-content: flex-end;
}

.project-funder {
  font-weight: 600;
  color: var(--text);
}

.project-time {
  text-align: right;
  white-space: nowrap;
}

.project-partners {
  margin-top: 12px;
  font-size: 0.9rem;
  color: var(--muted);
}

.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(0, 90, 169, 0.08);
  color: var(--accent);
  font-weight: 600;
  font-size: 0.78rem;
  border: 1px solid rgba(0, 90, 169, 0.18);
}

.project-card {
  cursor: pointer;
  opacity: 1;
  transition: opacity 0.5s ease;
}

/* Andere Karten: sanft ausblenden */
.project-card.is-fading {
  opacity: 0;
  pointer-events: none;
}

/* Andere Karten: aus Layout entfernen */
.project-card.is-gone {
  display: none;
}

/* Grid während der Animation: feste Höhe, relativ positioniert */
.project-grid.is-animating {
  position: relative;
}

/* Grid nach Animation: 1 Spalte */
.project-grid.is-focused {
  grid-template-columns: 1fr;
}

.project-detail-info {
  list-style: none;
  margin-top: 16px;
  display: none;
  gap: 8px;
  font-size: 0.92rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

.project-detail-info span {
  font-weight: 600;
  color: var(--text);
  margin-right: 6px;
}

.project-detail-info .detail-text {
  line-height: 1.6;
  color: var(--text);
}

.project-detail-info .detail-image {
  margin-top: 8px;
}

.project-detail-info .detail-image img {
  width: 100%;
  max-width: 600px;
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--border);
  object-fit: cover;
}

.project-detail-info .detail-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.project-detail-info .detail-links a {
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(0, 90, 169, 0.08);
  color: var(--accent);
  font-weight: 500;
  font-size: 0.85rem;
  border: 1px solid rgba(0, 90, 169, 0.18);
}

/* Phase 1: Karte wächst (absolute positioniert) */
.project-card.is-expanding {
  position: absolute;
  z-index: 2;
  box-shadow: var(--shadow);
  border-color: var(--accent);
  transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1),
              left 1.2s cubic-bezier(0.4, 0, 0.2, 1),
              top 1.2s cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow 0.4s ease,
              border-color 0.4s ease;
}

/* Phase 2: Karte ist fertig gewachsen (zurück im Fluss) */
.project-card.is-expanded {
  box-shadow: var(--shadow);
  border-color: var(--accent);
}

.project-card.is-expanded .project-detail-info {
  display: grid;
  animation: detailFadeIn 0.5s ease forwards;
}

@keyframes detailFadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.project-card:not(.is-expanded):hover {
  transform: translateY(-4px);
  border-color: var(--accent);
}

.resources {
  margin-top: 40px;
  background: #eef5fb;
  border-radius: var(--radius);
  padding: 24px;
  border: 1px solid #d5e6f7;
}

.resource-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin-top: 16px;
}

.resource-grid a {
  padding: 12px 14px;
  border-radius: 14px;
  background: #fff;
  border: 1px solid #d5e6f7;
  font-weight: 500;
}

.talks {
  margin-top: 36px;
}

.talks ul,
.teaching-card ul {
  display: grid;
  gap: 10px;
  list-style: none;
  color: var(--muted);
}

.publication-card {
  display: grid;
  gap: 8px;
  transition: transform 0.2s ease, border 0.2s ease;
}

.publication-card:not(.no-link):hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  cursor: pointer;
}

.publication-card.no-link {
  cursor: default;
}

.contact-grid {
  margin-top: 24px;
}

.contact-card {
  display: grid;
  gap: 8px;
}

.site-footer {
  padding: 32px 0;
  border-top: 1px solid var(--border);
  background: #fff;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 0.9rem;
  color: var(--muted);
}

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

@media (max-width: 900px) {
  .nav {
    position: fixed;
    top: 72px;
    right: 24px;
    background: #fff;
    border-radius: 16px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    padding: 16px;
    flex-direction: column;
    gap: 10px;
    display: none;
  }

  .nav.open {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }
}

@media (max-width: 600px) {
  .container {
    width: min(100% - 32px, var(--max-width));
  }

  .hero {
    padding-top: 48px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}