/* ------------------------------------------------------------
   Personal academic site — single stylesheet.
   To restyle the whole site, start with the variables below.
   ------------------------------------------------------------ */

:root {
  --accent: #00356b;          /* Yale blue */
  --accent-soft: #e8eef6;
  --text: #1f2328;
  --muted: #5b636d;
  --bg: #ffffff;
  --border: #e3e6ea;

  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
  --font-head: "Iowan Old Style", "Palatino Linotype", Palatino,
               Georgia, "Times New Roman", serif;

  --width: 56.25rem;          /* 900px */
}

@media (prefers-color-scheme: dark) {
  :root {
    --accent: #8cb8ea;
    --accent-soft: #1c2733;
    --text: #e6e8eb;
    --muted: #9aa3ad;
    --bg: #111418;
    --border: #2a3038;
  }
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
}

.wrap {
  max-width: var(--width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

a { color: var(--accent); text-underline-offset: 0.18em; }
a:hover { text-decoration-thickness: 2px; }

h1, h2, h3 {
  font-family: var(--font-head);
  font-weight: 600;
  line-height: 1.25;
}
h1 { font-size: 2.1rem; margin: 0 0 0.25rem; }
h2 {
  font-size: 1.35rem;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--border);
}
h3 { font-size: 1.1rem; margin: 0 0 0.2rem; }

/* ---------- Header / nav ---------- */

.site-header {
  border-bottom: 1px solid var(--border);
}
.site-header .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-top: 1.1rem;
  padding-bottom: 1.1rem;
}
.site-title {
  font-family: var(--font-head);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
}
.site-header nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
  font-size: 0.95rem;
}
.site-header nav a {
  color: var(--muted);
  text-decoration: none;
}
.site-header nav a:hover,
.site-header nav a[aria-current="page"] {
  color: var(--accent);
}

main.wrap { padding-top: 2.5rem; padding-bottom: 3rem; }

/* ---------- Home page intro ---------- */

.intro {
  display: flex;
  gap: 2rem;
  align-items: center;
  margin-bottom: 2rem;
}
.portrait {
  flex: none;
  width: 180px;
  height: 180px;
  object-fit: cover;
  border-radius: 8px;
}
.role { margin: 0 0 0.9rem; color: var(--muted); }

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.1rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.95rem;
}

@media (max-width: 560px) {
  .intro { flex-direction: column; align-items: flex-start; gap: 1.25rem; }
  .portrait { width: 140px; height: 140px; }
  h1 { font-size: 1.8rem; }
}

/* ---------- Papers / projects ---------- */

.entry { margin: 0 0 1.75rem; }
.entry .meta { margin: 0; color: var(--muted); font-size: 0.95rem; }
.entry .status { font-style: italic; }
.entry .conf { margin: 0.15rem 0 0; color: var(--muted); font-size: 0.85rem; }

.entry-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.5rem;
  margin: 0.45rem 0 0;
  padding: 0;
  list-style: none;
  font-size: 0.85rem;
}
.entry-links a,
.entry summary {
  display: inline-block;
  padding: 0.05rem 0.55rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--accent);
  text-decoration: none;
}
.entry-links a:hover,
.entry summary:hover { background: var(--accent-soft); }

.entry details { margin-top: 0.45rem; font-size: 0.85rem; }
.entry summary {
  cursor: pointer;
  list-style: none;
  user-select: none;
}
.entry summary::-webkit-details-marker { display: none; }
.entry summary::before { content: "+ "; }
.entry details[open] summary::before { content: "\2212  "; }
.entry details p {
  margin: 0.6rem 0 0;
  font-size: 0.95rem;
  color: var(--text);
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
}
.site-footer .wrap { padding-top: 1.25rem; padding-bottom: 2rem; }