/* ---------------------------------------------------------------
   Haiming (Richard) Li — academic site
   Plain, conventional, fast. No webfonts, no frameworks.
   To change the accent color, edit --link below.
   --------------------------------------------------------------- */

:root {
  --ink:    #16181d;
  --muted:  #5b6270;
  --rule:   #d8dbe0;
  --link:   #1f4e79;
  --bg:     #ffffff;
  --measure: 40rem;
}

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

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

body {
  margin: 0;
  padding: 3rem 1.5rem 5rem;
  background: var(--bg);
  color: var(--ink);
  font-family: Charter, "Bitstream Charter", "Sitka Text", Cambria, Georgia, serif;
  font-size: 1.0625rem;
  line-height: 1.65;
}

.wrap { max-width: var(--measure); margin: 0 auto; }

/* ---- masthead ---- */

.masthead { margin-bottom: 2rem; }

.masthead h1 {
  font-size: 1.75rem;
  line-height: 1.2;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 0.35rem;
}

.masthead .affil {
  color: var(--muted);
  font-size: 0.95rem;
  margin: 0;
}

/* ---- navigation ---- */

nav {
  margin: 1.25rem 0 2.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--rule);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 0.875rem;
}

nav a {
  margin-right: 1.5rem;
  text-decoration: none;
  color: var(--muted);
}

nav a:hover { color: var(--link); text-decoration: underline; }
nav a[aria-current="page"] { color: var(--ink); font-weight: 600; }

/* ---- portrait ---- */

.portrait {
  float: right;
  width: 9.5rem;
  margin: 0.25rem 0 1.25rem 1.75rem;
  border-radius: 2px;
}

/* ---- text ---- */

p { margin: 0 0 1.1rem; }

a { color: var(--link); }
a:hover { text-decoration: underline; }

h2 {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--muted);
  margin: 2.75rem 0 1.1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--rule);
  clear: both;
}

h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.4;
  margin: 0 0 0.3rem;
}

/* ---- paper entries ---- */

.paper { margin-bottom: 1.9rem; }

.paper .byline {
  color: var(--muted);
  font-size: 0.9375rem;
  margin: 0 0 0.5rem;
}

.paper .abstract { margin: 0 0 0.5rem; }

.paper .links {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 0.875rem;
  margin: 0;
}

.paper .links a { margin-right: 1rem; }

/* compact entries for works in progress */

ul.compact { padding-left: 1.15rem; margin: 0 0 1.1rem; }
ul.compact li { margin-bottom: 0.6rem; }
ul.compact .byline { color: var(--muted); font-size: 0.9375rem; }

/* ---- contact block ---- */

.contact {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 0.9375rem;
  line-height: 1.9;
}

.contact .label {
  display: inline-block;
  min-width: 5.5rem;
  color: var(--muted);
}

/* ---- placeholder marker: search the files for TBD to find open items ---- */

.tbd {
  background: #fff3cd;
  padding: 0 0.2em;
  border-radius: 2px;
}

/* ---- footer ---- */

footer {
  margin-top: 4rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.8125rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* ---- small screens ---- */

@media (max-width: 34rem) {
  body { padding-top: 2rem; font-size: 1rem; }
  .portrait { float: none; display: block; margin: 0 0 1.25rem; width: 8rem; }
  nav a { margin-right: 1.1rem; display: inline-block; margin-bottom: 0.35rem; }
}

/* ---- print ---- */

@media print {
  nav, footer { display: none; }
  body { padding: 0; }
  a { color: var(--ink); text-decoration: none; }
}

:focus-visible { outline: 2px solid var(--link); outline-offset: 2px; }