:root {
  --bg: #f7f9fc;
  --surface: #ffffff;
  --card: #ffffff;
  --text: #0d1b2a;
  --muted: #4b5563;
  --accent: #2563eb;
  --accent-2: #0ea5e9;
  --border: #e5e7eb;
  --shadow: 0 10px 20px rgba(2,6,23,0.08);
  --radius: 14px;
  --radius-sm: 10px;
  --space: 18px;
  --space-lg: 28px;
  --maxw: 1100px;
}

html, body { height: 100%; }
* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--text);
  background: radial-gradient(1200px 800px at 20% -10%, rgba(77,163,255,0.12), transparent 60%),
              radial-gradient(800px 600px at 85% -10%, rgba(14,165,233,0.12), transparent 60%),
              var(--bg);
  background-attachment: fixed;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  font-size: clamp(15px, 1.05vw, 18px);
  line-height: 1.6;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--space);
}

/* Header / Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(1.2) blur(10px);
  background: color-mix(in oklab, var(--bg) 80%, transparent);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}
.brand { font-weight: 700; letter-spacing: 0.2px; }
.brand a { color: var(--text); text-decoration: none; }
.nav a { color: var(--muted); text-decoration: none; margin-left: 16px; }
.nav a:hover { color: var(--accent); }

.social-container {
  padding: 8px 0 14px 0;
}

/* Social links - second line in navigation */
.social-links {
  display: flex;
  gap: 12px;
  padding-left: 0;
}
.social-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  color: var(--muted);
  text-decoration: none;
  transition: color 140ms ease;
}
.social-links a:hover {
  color: var(--accent);
}
.social-links .icon {
  width: 20px;
  height: 20px;
  display: inline-block;
}

/* Intro */
h1 {
  font-size: clamp(28px, 3.2vw, 44px);
  line-height: 1.2;
  margin: 28px 0 12px;
}
h2 {
  font-size: clamp(20px, 2.2vw, 28px);
  margin: 28px 0 12px;
}
h3 { margin: 18px 0 8px; color: var(--muted); }

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

.about { font-size: 1.05em; }
.about img {
  width: 220px;
  max-width: 35vw;
  border-radius: 14px;
  float: right;
  margin-left: 24px;
  box-shadow: var(--shadow);
}

/* Generic links */
a { color: var(--accent); }
a:hover { color: var(--accent-2); }

/* Lists as modern cards */
.item-list { list-style: none; margin: 0; padding: 0; }
.item-list li {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin: 14px 0;
  padding: 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform 140ms ease, box-shadow 140ms ease;
}
.item-list li:hover { transform: translateY(-2px); }
.item-list li .preview img {
  width: 110px;
  height: 110px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
.item-list li .text { flex: 1 1 auto; font-size: 1em; }
.item-list li .text h3,
.item-list li .text p { margin: 0; }

/* Video list - grid layout */
.video-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }
.video-list li {
  display: flex;
  flex-direction: column;
  padding: 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform 140ms ease, box-shadow 140ms ease;
}
.video-list li:hover { transform: translateY(-2px); }
.video-list li .preview {
  margin-bottom: 12px;
}
.video-list li .preview img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
.video-list li .text { font-size: 1em; }
.video-list li .text h3,
.video-list li .text p { margin: 0; }

/* Chips for Links section */
.chips { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.chips a {
  display: inline-flex;
  align-items: center;
  padding: 8px 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 999px;
  text-decoration: none;
  box-shadow: var(--shadow);
}
.chips a:hover { border-color: var(--accent); color: var(--accent); }
.chip-icon { width: 1.1em; height: 1.1em; margin-right: 8px; display: inline-block; }

/* Footer */
footer { color: var(--muted); text-align: center; padding: 40px 0; }

/* Teaching legend */
.teaching-legend {
  margin: 20px 0;
  padding: 15px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.teaching-legend h3 {
  margin-top: 0;
  color: var(--muted);
  font-size: 1em;
}
.legend-items {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
  margin-top: 10px;
}
.legend-items span {
  padding: 5px 10px;
  border-radius: 5px;
  font-size: 0.9em;
  font-weight: 500;
}
/* Teaching type colors - used for both legend and list items */
.type-lecture { background-color: #e3f2fd; color: #1565c0; }
.type-seminar { background-color: #f3e5f5; color: #7b1fa2; }
.type-lab { background-color: #e8f5e9; color: #388e3c; }
.type-project { background-color: #fff3e0; color: #f57c00; }
.type-projektgruppe { background-color: #fce4ec; color: #c2185b; }
.type-project-lab {
  background: linear-gradient(90deg, #e8f5e9 50%, #fff3e0 50%);
  color: #1a237e;
  font-weight: 600;
}

/* Apply type colors to teaching list items */
.teaching-item {
  border: none !important;
  box-shadow: none !important;
}
.teaching-item .text {
  padding: 15px;
  border-radius: var(--radius);
  transition: transform 140ms ease;
}
.teaching-item:hover .text {
  transform: translateY(-2px);
}
.teaching-item.type-lecture .text {
  background-color: #e3f2fd;
  color: #1565c0;
}
.teaching-item.type-seminar .text {
  background-color: #f3e5f5;
  color: #7b1fa2;
}
.teaching-item.type-lab .text {
  background-color: #e8f5e9;
  color: #388e3c;
}
.teaching-item.type-project .text {
  background-color: #fff3e0;
  color: #f57c00;
}
.teaching-item.type-projektgruppe .text {
  background-color: #fce4ec;
  color: #c2185b;
}
.teaching-item.type-project-lab .text {
  background: linear-gradient(90deg, #e8f5e9 50%, #fff3e0 50%);
  color: #388e3c;
  font-weight: normal;
}

.teaching-comment {
  font-style: italic;
  color: var(--muted);
  font-size: 0.9em;
}

/* News list */
.news-list { list-style: none; padding: 0; margin: 0; }
.news-list li {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  padding: 12px 14px;
  border-radius: var(--radius);
  margin: 14px 0;
}

/* Responsive tweaks */
@media (max-width: 720px) {
  .item-list li { flex-direction: column; }
  .item-list li .preview img { width: 100%; height: auto; }
  .video-list { grid-template-columns: 1fr; }
  .video-list li .preview img { height: 150px; }
  .about img { width: 150px; }
  .nav .links { display: none; }
}

.cryptedmail:after {
  content: attr(data-name) "@" attr(data-domain) "." attr(data-tld);
}