/* ---------------------------------------------------
   Nils Brandenstein — personal site
   Plain, dependency-free CSS. No frameworks, no build step.
--------------------------------------------------- */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f7f9;
  --border: #e6e8ec;
  --text: #1b1f24;
  --text-soft: #565d66;
  --accent: #2054c9;
  --accent-soft: #eaf0ff;
  --radius: 12px;
  --max-width: 760px;
  --shadow: 0 1px 2px rgba(20, 24, 32, 0.04), 0 4px 16px rgba(20, 24, 32, 0.04);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --bg-soft: #1b1e23;
    --border: #2a2e35;
    --text: #e8eaed;
    --text-soft: #9aa1ab;
    --accent: #7aa2ff;
    --accent-soft: #1c2740;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.2), 0 4px 16px rgba(0, 0, 0, 0.25);
  }
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.6;
  font-size: 17px;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header / nav */
.site-header {
  border-bottom: 1px solid var(--border);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 18px;
  padding-bottom: 18px;
  gap: 16px;
  flex-wrap: wrap;
}

.brand {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
  white-space: nowrap;
}

.brand:hover {
  text-decoration: none;
  color: var(--accent);
}

nav.site-nav {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

nav.site-nav a {
  color: var(--text-soft);
  font-size: 0.95rem;
  padding: 6px 10px;
  border-radius: 8px;
}

nav.site-nav a:hover {
  color: var(--text);
  background: var(--bg-soft);
  text-decoration: none;
}

nav.site-nav a[aria-current="page"] {
  color: var(--accent);
  background: var(--accent-soft);
}

/* Main content */
main {
  padding: 48px 0 64px;
}

h1 {
  font-size: 1.6rem;
  margin: 0 0 8px;
}

h2 {
  font-size: 1.15rem;
  margin: 0 0 14px;
  letter-spacing: 0.01em;
}

.page-desc {
  color: var(--text-soft);
  margin: 0 0 32px;
}

section + section {
  margin-top: 36px;
  padding-top: 36px;
  border-top: 1px solid var(--border);
}

/* Profile / hero (home page) */
.hero {
  display: flex;
  gap: 28px;
  align-items: center;
  flex-wrap: wrap;
}

.hero img {
  width: 128px;
  height: 128px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  box-shadow: var(--shadow);
}

.hero-text h1 {
  font-size: 1.7rem;
}

.hero-text p {
  color: var(--text-soft);
  margin: 8px 0 0;
  max-width: 56ch;
}

.buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text);
  font-size: 0.92rem;
  font-weight: 500;
  background: var(--bg-soft);
}

.btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
  background: var(--accent-soft);
}

/* Icon links (social / contact) */
.icon-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.icon-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 12px;
  border-radius: 8px;
  color: var(--text-soft);
  font-size: 0.88rem;
}

.icon-link svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon-link:hover {
  background: var(--bg-soft);
  color: var(--accent);
  text-decoration: none;
}

/* Publications list */
.pub-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.pub-list li {
  display: flex;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}

.pub-list li:last-child {
  border-bottom: none;
}

.pub-year {
  flex-shrink: 0;
  width: 3.2em;
  color: var(--text-soft);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.pub-year-group {
  margin-top: 28px;
}

.pub-year-group:first-child {
  margin-top: 0;
}

.pub-year-heading {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-soft);
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}

address {
  font-style: normal;
}

.card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
}

iframe.map {
  width: 100%;
  height: 380px;
  border: 0;
  border-radius: var(--radius);
  margin-top: 8px;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  color: var(--text-soft);
  font-size: 0.85rem;
}

.site-footer .wrap {
  padding-top: 24px;
  padding-bottom: 32px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}

@media (max-width: 480px) {
  body {
    font-size: 16px;
  }
  .hero {
    flex-direction: column;
    align-items: flex-start;
  }
  .hero img {
    width: 104px;
    height: 104px;
  }
}