/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --navy:   #002147;
  --blue:   #0055a5;
  --blue-lt:#3378c5;
  --accent: #e8a020;
  --bg:     #ffffff;
  --bg-alt: #f4f6f9;
  --border: #d0d7e2;
  --text:   #222222;
  --muted:  #555555;
  --link:   #0055a5;
  --link-h: #003880;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}

a { color: var(--link); text-decoration: none; }
a:hover { color: var(--link-h); text-decoration: underline; }

/* ===== Header ===== */
header {
  background: var(--navy);
  color: #fff;
  padding: 1.5rem 2rem 0;
}

.header-inner {
  max-width: 960px;
  margin: 0 auto;
}

.site-title {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: #fff;
}

.site-title a { color: #fff; }
.site-title a:hover { text-decoration: none; color: #cce0ff; }

.site-subtitle {
  font-size: .95rem;
  color: #a8c4e8;
  margin-top: .2rem;
  margin-bottom: 1rem;
}

/* ===== Navigation tabs ===== */
nav {
  margin-top: .8rem;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 0;
  flex-wrap: wrap;
}

nav ul li a {
  display: block;
  padding: .55rem 1.1rem;
  color: #cce0ff;
  font-size: .92rem;
  font-weight: 500;
  border-radius: 4px 4px 0 0;
  transition: background .15s, color .15s;
}

nav ul li a:hover {
  background: rgba(255,255,255,.15);
  color: #fff;
  text-decoration: none;
}

nav ul li a.active {
  background: var(--bg);
  color: var(--navy);
  font-weight: 700;
}

/* ===== Main content ===== */
main {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
}

/* ===== Home page: two-column layout ===== */
.home-grid {
  display: grid;
  grid-template-columns: 210px 1fr;
  gap: 2.5rem;
  align-items: start;
  margin-top: .5rem;
}

@media (max-width: 640px) {
  .home-grid { grid-template-columns: 1fr; }
}

.profile-photo {
  width: 100%;
  border-radius: 6px;
  box-shadow: 0 2px 8px rgba(0,0,0,.15);
}

.profile-photo-placeholder {
  width: 100%;
  aspect-ratio: 3/4;
  background: var(--bg-alt);
  border: 2px dashed var(--border);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-size: .85rem;
  text-align: center;
}

.contact-block {
  margin-top: 1.2rem;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--muted);
}

.contact-block strong { color: var(--text); display: block; margin-bottom: .3rem; font-size: .95rem; }

h1 { font-size: 1.55rem; color: var(--navy); margin-bottom: .9rem; }
h2 { font-size: 1.2rem; color: var(--navy); margin: 1.8rem 0 .7rem; border-bottom: 2px solid var(--border); padding-bottom: .3rem; }
h3 { font-size: 1rem; color: var(--navy); margin: 1.2rem 0 .4rem; }

p { margin-bottom: .9rem; }

/* ===== Publications ===== */
.year-group { margin-bottom: 2.2rem; }

.year-label {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--blue);
  border-left: 4px solid var(--accent);
  padding-left: .6rem;
  margin-bottom: 1rem;
}

.pub-list { list-style: none; }

.pub-item {
  padding: .75rem 0;
  border-bottom: 1px solid #eee;
  font-size: .93rem;
}

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

.pub-title { font-style: italic; }
.pub-authors em { font-style: normal; font-weight: 600; }
.pub-journal { color: var(--muted); }
.pub-doi a { font-size: .82rem; color: var(--blue-lt); }

/* ===== Talks & Patents ===== */
.talk-list, .patent-list { list-style: none; }

.talk-item, .patent-item {
  padding: .6rem 0;
  border-bottom: 1px solid #eee;
  font-size: .93rem;
}

.talk-item:last-child, .patent-item:last-child { border-bottom: none; }

.talk-title { font-style: italic; font-weight: 600; }

/* ===== Software ===== */
.software-list { list-style: none; }

.software-item {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.1rem 1.3rem;
  margin-bottom: 1rem;
}

.software-name { font-size: 1.05rem; font-weight: 700; color: var(--navy); }
.software-badges { margin: .3rem 0 .5rem; display: flex; gap: .4rem; flex-wrap: wrap; }

.badge {
  display: inline-block;
  padding: .18rem .55rem;
  border-radius: 3px;
  font-size: .78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .03em;
}

.badge-pypi   { background: #3775a9; color: #fff; }
.badge-cran   { background: #276dc2; color: #fff; }
.badge-ctan   { background: #328f3d; color: #fff; }
.badge-github { background: #24292e; color: #fff; }
.badge-r      { background: #276dc2; color: #fff; }

.software-desc { font-size: .92rem; color: var(--text); margin-bottom: .4rem; }
.software-links { font-size: .88rem; }
.software-links a { margin-right: .8rem; }

/* ===== Teaching ===== */
.course-table { width: 100%; border-collapse: collapse; font-size: .93rem; }
.course-table th { background: var(--navy); color: #fff; padding: .55rem .8rem; text-align: left; font-weight: 600; }
.course-table td { padding: .5rem .8rem; border-bottom: 1px solid var(--border); vertical-align: top; }
.course-table tr:nth-child(even) td { background: var(--bg-alt); }

/* ===== Other Stuff ===== */
.photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.2rem;
  margin-top: 1rem;
}

.photo-card {
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  background: var(--bg-alt);
}

.photo-card img { width: 100%; display: block; }

.photo-caption {
  padding: .6rem .8rem;
  font-size: .88rem;
  color: var(--muted);
  font-style: italic;
}

/* ===== Footer ===== */
footer {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  padding: 1.2rem 2rem;
  text-align: center;
  font-size: .83rem;
  color: var(--muted);
}

footer a { color: var(--muted); }
footer a:hover { color: var(--link); }