/* al-folio–style academic theme, UT burnt orange accent */
:root {
  --theme: #bf5700;
  --text: #212529;
  --muted: #6c757d;
  --bg: #ffffff;
  --card: #ffffff;
  --divider: rgba(0, 0, 0, 0.1);
  --code-bg: #f5f5f5;
  --shadow: 0 2px 5px 0 rgba(0,0,0,.16), 0 2px 10px 0 rgba(0,0,0,.12);
}
html[data-theme="dark"] {
  --theme: #e98a3c;
  --text: #c9d1d9;
  --muted: #8b949e;
  --bg: #1c1c1d;
  --card: #212529;
  --divider: #424246;
  --code-bg: #2c3237;
  --shadow: 0 2px 5px 0 rgba(0,0,0,.4);
}
* { box-sizing: border-box; }
html { scroll-padding-top: 72px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-weight: 300;
  font-size: 1rem;
  line-height: 1.6;
  padding-top: 64px;
  transition: background-color .2s, color .2s;
}
a { color: var(--theme); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--theme); outline-offset: 2px; }
.bold, strong, b { font-weight: 700; }
em { font-style: italic; }

/* Navbar */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 10;
  background: var(--bg);
  box-shadow: 0 1px 4px rgba(0,0,0,.08);
  border-bottom: 1px solid var(--divider);
}
.nav-inner {
  max-width: 930px; margin: 0 auto; padding: 0 15px;
  display: flex; align-items: center; justify-content: space-between; min-height: 56px;
}
.brand { color: var(--text); font-size: 1.25rem; font-weight: 300; }
.brand:hover { text-decoration: none; color: var(--theme); }
.navbar ul { list-style: none; margin: 0; padding: 0; display: flex; align-items: center; gap: .25rem; }
.navbar nav a {
  color: var(--text); padding: .5rem .6rem; display: block; font-weight: 400;
}
.navbar nav a:hover { color: var(--theme); text-decoration: none; }
.navbar nav a.active { color: var(--theme); font-weight: 500; }
.theme-toggle, .nav-toggle {
  background: none; border: 0; color: var(--text); cursor: pointer; font-size: 1rem; padding: .5rem .6rem;
}
.theme-toggle:hover, .nav-toggle:hover { color: var(--theme); }
.nav-toggle { display: none; font-size: 1.2rem; }

/* Layout */
.container { max-width: 930px; margin: 0 auto; padding: 1.5rem 15px 1rem; }
.post-header { margin-bottom: 1.5rem; }
.post-title { font-size: 2.5rem; font-weight: 300; margin: .5rem 0 0; line-height: 1.2; }
.desc { color: var(--muted); margin: .25rem 0 0; font-size: 1rem; }
.post-header::after {
  content: ""; display: block; border-bottom: 1px solid var(--divider); margin-top: 1rem;
}
p { margin: 0 0 1rem; }

/* Profile */
.profile { float: right; width: 30%; max-width: 260px; margin: 0 0 1rem 1.5rem; }
.profile img {
  width: 100%; height: auto; display: block; border-radius: .25rem; box-shadow: var(--shadow);
  background: var(--code-bg); aspect-ratio: 13 / 16; object-fit: cover;
}
.more-info { margin-top: .75rem; text-align: center; font-size: .9rem; line-height: 1.45; }
.more-info p { margin: 0; }
.clearfix::after { content: ""; display: table; clear: both; }

/* Section titles */
.section-title {
  font-size: 1.75rem; font-weight: 400; margin: 2rem 0 1rem; color: var(--theme); clear: both;
}
.section-title a { color: inherit; }
h3 { font-weight: 500; font-size: 1.15rem; margin: .4rem 0 .5rem; line-height: 1.35; }
h3.sub { font-size: 1.15rem; color: var(--text); margin-top: 1.5rem; }

/* Bibliography (al-folio style) */
ol.bibliography { list-style: none; padding: 0; margin: 0; }
.pub { display: flex; gap: 1.25rem; padding: .9rem 0; border-top: 1px solid var(--divider); }
.pub:first-child { border-top: 0; }
.abbr { flex: 0 0 110px; padding-top: .15rem; }
.badge {
  display: inline-block; width: 100%; max-width: 110px; text-align: center;
  background: var(--theme); color: #fff; font-weight: 500; font-size: .78rem;
  padding: .3rem .4rem; border-radius: .25rem; line-height: 1.2;
}
html[data-theme="dark"] .badge { color: #1c1c1d; }
.pub-body { flex: 1; min-width: 0; }
.pub .title { font-weight: 500; line-height: 1.4; }
.pub .author, .pub .periodical { font-size: .95rem; }
.pub .me { font-style: normal; font-weight: 500; text-decoration: underline; text-underline-offset: 2px; }
.links { margin-top: .4rem; display: flex; flex-wrap: wrap; gap: .35rem; }
.btn {
  display: inline-block; font-family: inherit; font-size: .75rem; font-weight: 400;
  color: var(--theme); background: transparent; border: 1px solid var(--theme);
  border-radius: .2rem; padding: .1rem .55rem; line-height: 1.5; cursor: pointer;
  transition: background-color .15s, color .15s;
}
.btn:hover, .btn[aria-expanded="true"] { background: var(--theme); color: var(--bg); text-decoration: none; }
.abstract {
  margin-top: .6rem; padding: .75rem 1rem; border: 1px solid var(--divider);
  border-radius: .25rem; font-size: .92rem; background: var(--code-bg);
}
.abstract p { margin: 0; }
h2.year {
  text-align: right; font-size: 2rem; font-weight: 300; color: var(--divider);
  margin: 1.5rem 0 0; line-height: 1;
}
html[data-theme="dark"] h2.year { color: var(--muted); }

/* Research projects */
.project { padding: 1rem 0; border-top: 1px solid var(--divider); }
.project .badge { width: auto; max-width: none; padding: .25rem .6rem; }
.project .meta { color: var(--muted); font-size: .92rem; margin-bottom: .25rem; }
.project .status { font-size: .92rem; font-style: italic; margin: 0; }

ul.plain { list-style: none; padding: 0; margin: 0 0 1rem; }
ul.plain li { padding: .6rem 0; border-top: 1px solid var(--divider); }
ul.plain li:first-child { border-top: 0; }
.item-title { font-weight: 500; }
.tag {
  font-size: .72rem; border: 1px solid var(--muted); color: var(--muted);
  border-radius: .2rem; padding: 0 .4rem; margin-left: .25rem; white-space: nowrap; vertical-align: 1px;
}

/* Teaching */
ul.courses { list-style: none; padding: 0; margin: 0 0 1rem; }
ul.courses li {
  display: flex; justify-content: space-between; gap: 1rem; align-items: baseline;
  padding: .45rem 0; border-top: 1px solid var(--divider);
}
ul.courses li:first-child { border-top: 0; }
.course .btn { margin-left: .4rem; vertical-align: 1px; }
.term { color: var(--muted); white-space: nowrap; font-size: .95rem; }

/* Social */
.social { text-align: center; margin: 2.5rem 0 1rem; }
.contact-icons a { font-size: 2rem; color: var(--text); margin: 0 .5rem; }
.contact-icons a:hover { color: var(--theme); text-decoration: none; }
.contact-note { margin-top: .5rem; font-size: .9rem; color: var(--muted); }

/* Footer */
.site-footer {
  max-width: 930px; margin: 2rem auto 0; padding: 1rem 15px 2rem; text-align: center;
  font-size: .8rem; color: var(--muted); border-top: 1px solid var(--divider);
}

/* Mobile */
@media (max-width: 767px) {
  .nav-toggle { display: block; }
  .navbar nav { display: none; position: absolute; top: 56px; left: 0; right: 0; background: var(--bg); border-bottom: 1px solid var(--divider); }
  .navbar nav.open { display: block; }
  .navbar ul { flex-direction: column; align-items: flex-start; padding: .5rem 15px; }
  .profile { float: none; width: 60%; max-width: 240px; margin: 0 auto 1.5rem; }
  .post-title { font-size: 2rem; }
  .pub { flex-direction: column; gap: .4rem; }
  .abbr { flex: none; }
  .badge { width: auto; }
  ul.courses li { flex-direction: column; gap: 0; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }