/* Minimal homepage — Mike Ion */

:root {
  --text: #1a1a1a;
  --muted: #6a6a6a;
  --link: #0b5fff;
  --accent: #b85c38;
  --rule: #e5e5e5;
  --bg: #ffffff;
  --max: 640px;
}

* { box-sizing: border-box; }

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

body {
  font-family: "Charter", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  font-size: 17px;
  line-height: 1.55;
  color: var(--text);
  background: var(--bg);
  margin: 0;
  padding: 0;
}

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 3rem 1.25rem 4rem;
}

h1, h2, h3 {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
}

h1 {
  font-size: 2rem;
  margin: 0 0 0.25rem 0;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.05rem;
  margin: 2.4rem 0 0.6rem 0;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  position: relative;
  padding-left: 1.1rem;
}
h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 0.6rem;
  height: 2px;
  background: var(--accent);
}

h3 {
  font-size: 1rem;
  margin: 1.5rem 0 0.3rem 0;
}

p { margin: 0 0 1rem 0; }

a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
a:hover { border-bottom-color: var(--link); }

hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 2rem 0;
}

/* Nav */
.topnav {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 0.88rem;
  color: var(--muted);
  margin-bottom: 3rem;
}
.topnav a {
  color: var(--text);
  border-bottom: none;
}
.topnav a:hover { color: var(--link); }
.topnav .sep {
  color: var(--rule);
  margin: 0 0.35rem;
}

/* Hero */
.hero {
  margin-bottom: 3rem;
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
}
.hero-photo {
  width: 92px;
  height: 92px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  margin-top: 0.3rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}
.hero-text { flex: 1; min-width: 0; }
.hero .role {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 1.2rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}
.hero p { margin-bottom: 0.8rem; }

/* Research directions */
.threads { counter-reset: thread; padding: 0; list-style: none; margin: 0; }
.threads li {
  counter-increment: thread;
  padding-left: 2.2rem;
  position: relative;
  margin-bottom: 1.1rem;
}
.threads li::before {
  content: counter(thread, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.15rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: 0.05em;
}
.threads strong { font-weight: 600; }

/* Featured papers */
.paper {
  margin-bottom: 1.4rem;
  padding-bottom: 1.4rem;
  border-bottom: 1px solid var(--rule);
}
.paper:last-child { border-bottom: none; }
.paper .venue {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 0.25rem;
}
.paper .title {
  font-weight: 600;
  display: block;
  margin-bottom: 0.3rem;
}
.paper .blurb {
  color: #333;
  margin-bottom: 0.4rem;
}
.paper .meta {
  font-size: 0.85rem;
  color: var(--muted);
}
.paper .meta a { color: var(--muted); }
.paper .meta a:hover { color: var(--link); }

/* News */
.news { list-style: none; padding: 0; margin: 0; }
.news li {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: 0.9rem;
  margin-bottom: 0.55rem;
  font-size: 0.95rem;
}
.news .date {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 0.82rem;
  color: var(--muted);
  padding-top: 0.15rem;
}

/* Publications page */
.publications h3 {
  font-size: 0.92rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-top: 2.4rem;
  margin-bottom: 0.8rem;
  font-weight: 600;
}
.publications ol, .publications ul {
  padding-left: 1.2rem;
  margin: 0;
}
.publications li {
  margin-bottom: 0.9rem;
  font-size: 0.95rem;
  line-height: 1.5;
}

/* Publication type tags */
.tag {
  display: inline-block;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.12rem 0.45rem;
  border: 1px solid;
  border-radius: 3px;
  margin-right: 0.45rem;
  vertical-align: 0.12em;
  white-space: nowrap;
}
.tag-journal      { color: #1a56db; border-color: #b8d0f5; background: #f4f8ff; }
.tag-proceedings  { color: #6b46c1; border-color: #d4c5ee; background: #f9f5ff; }
.tag-workshop     { color: #8855cc; border-color: #ddcbf0; background: #faf6ff; }
.tag-demo         { color: #0d7a8a; border-color: #a8d5dd; background: #f2fafc; }
.tag-chapter      { color: #92582c; border-color: #e0c4a3; background: #fff8ef; }
.tag-talk         { color: #2d7a3e; border-color: #a8d9b5; background: #f3faf5; }
.tag-poster       { color: #b23c5e; border-color: #e6b8c6; background: #fff5f7; }
.tag-article      { color: #666;    border-color: #d0d0d0; background: #f8f8f8; }
.tag-preprint     { color: #9b6914; border-color: #dec897; background: #fffbee; }

/* Projects page */
.project {
  margin-bottom: 2rem;
  padding-bottom: 1.2rem;
  border-bottom: 1px solid var(--rule);
}
.project:last-child { border-bottom: none; }
.project h3 {
  margin: 0 0 0.2rem;
  font-size: 1.05rem;
}
.project .meta {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
}
.project p { margin: 0.4rem 0 0; }

/* About page */
.about .headshot {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 0 1.2rem 0;
  display: block;
}

.hero-links {
  margin-top: 0.6rem;
  font-size: 0.9rem;
}

/* Footer */
footer {
  margin-top: 4rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--rule);
  font-size: 0.85rem;
  color: var(--muted);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}
footer a { color: var(--muted); }
footer a:hover { color: var(--link); }

/* Footer social icons */
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.1rem 1rem;
  margin-top: 0.2rem;
}
.footer-links a { color: var(--muted); }
.footer-links a:hover { color: var(--link); }

@media (max-width: 480px) {
  main { padding: 2rem 1rem 3rem; }
  .topnav { font-size: 0.82rem; }
  .topnav .sep { margin: 0 0.2rem; }
  .news li { grid-template-columns: 4.5rem 1fr; gap: 0.6rem; }
  .hero { gap: 1rem; }
  .hero-photo { width: 72px; height: 72px; }
  h1 { font-size: 1.6rem; }
}