:root {
  --bg: #faf8f4;
  --surface: #ffffff;
  --text: #22252b;
  --muted: #5f6570;
  --line: #e4e0d8;
  --accent: #2f5d62;
  --accent-soft: #e6efee;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171b;
    --surface: #1d2025;
    --text: #e6e4df;
    --muted: #a0a5ad;
    --line: #2e3238;
    --accent: #7fb7b0;
    --accent-soft: #23302f;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

/* ---------- Layout: sticky profile sidebar + content ---------- */

.page {
  max-width: 1080px;
  margin: 0 auto;
  padding: 56px 24px;
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 64px;
}

.sidebar {
  position: sticky;
  top: 56px;
  align-self: start;
}

.avatar {
  width: 148px;
  height: 148px;
  border-radius: 50%;
  object-fit: cover;
  display: grid;
  place-items: center;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--serif);
  font-size: 52px;
  border: 1px solid var(--line);
}

.sidebar h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 30px;
  line-height: 1.2;
  margin: 22px 0 6px;
}

.sidebar .role {
  color: var(--muted);
  font-size: 14.5px;
  margin: 0 0 18px;
}

.links {
  list-style: none;
  padding: 0;
  margin: 0 0 22px -6px;
  display: flex;
  gap: 6px;
}
.links a {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  color: var(--muted);
}
.links a:hover { color: var(--accent); background: var(--accent-soft); }
.links svg { width: 20px; height: 20px; }

nav.menu {
  border-top: 1px solid var(--line);
  padding-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
nav.menu a {
  color: var(--muted);
  font-size: 15px;
  padding: 5px 10px;
  margin-left: -10px;
  border-radius: 6px;
}
nav.menu a:hover { color: var(--text); background: var(--accent-soft); text-decoration: none; }
nav.menu a[aria-current="page"] { color: var(--accent); font-weight: 600; }

main { min-width: 0; }

/* ---------- Content ---------- */

section { margin-bottom: 52px; }

h2 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 24px;
  margin: 0 0 18px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

h3 { font-size: 16px; margin: 0 0 4px; }

.lede { font-size: 17.5px; }

.tags { display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 14px 0 0; list-style: none; }
.tags li {
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 13.5px;
  padding: 3px 12px;
  border-radius: 999px;
}

/* Timeline rows: date column + body */
.rows { list-style: none; padding: 0; margin: 0; }
.rows > li {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 18px;
  padding: 10px 0;
}
.rows .when { color: var(--muted); font-size: 14px; padding-top: 1px; font-variant-numeric: tabular-nums; }
.rows .sub { color: var(--muted); font-size: 14.5px; }
.rows ul { margin: 6px 0 0; padding-left: 18px; font-size: 15px; }

/* Publications */
.pubs { list-style: none; padding: 0; margin: 0; counter-reset: pub; }
.pubs > li {
  position: relative;
  padding: 16px 18px 16px 52px;
  margin-bottom: 12px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
}
.pubs > li::before {
  counter-increment: pub;
  content: counter(pub);
  position: absolute;
  left: 18px;
  top: 16px;
  font-family: var(--serif);
  color: var(--muted);
}
.pub-title { font-weight: 600; display: block; }
.pub-authors { font-size: 14.5px; color: var(--muted); }
.pub-authors b { color: var(--text); font-weight: 600; }
.pub-venue { font-size: 14.5px; font-style: italic; }
.badges { margin-top: 8px; display: flex; flex-wrap: wrap; gap: 6px; }
.badge {
  font-size: 12.5px;
  padding: 2px 10px;
  border: 1px solid var(--accent);
  border-radius: 999px;
}
.badge:hover { background: var(--accent); color: var(--bg); text-decoration: none; }

.more { font-size: 15px; font-weight: 500; }

.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px;
  list-style: none;
  padding: 0;
  margin: 0;
}
.course-grid li {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 15px;
}
.course-grid .code { font-weight: 600; color: var(--accent); display: block; font-size: 14px; }

footer {
  grid-column: 1 / -1;
  border-top: 1px solid var(--line);
  padding-top: 18px;
  color: var(--muted);
  font-size: 13.5px;
}

/* ---------- Mobile ---------- */

@media (max-width: 820px) {
  .page { grid-template-columns: 1fr; gap: 36px; padding: 32px 16px; }
  .sidebar { position: static; }
  .profile { display: flex; gap: 18px; align-items: center; }
  .avatar { width: 88px; height: 88px; font-size: 32px; }
  .sidebar h1 { margin-top: 0; font-size: 26px; }
  .sidebar .role { margin-bottom: 0; }
  .links { margin: 14px 0 14px -6px; }
  nav.menu { flex-direction: row; flex-wrap: wrap; gap: 4px 6px; }
  nav.menu a { margin-left: 0; }
  .rows > li { grid-template-columns: 1fr; gap: 2px; }
}