/* Ahasan Kabir — personal site
   Classic minimal academic layout: one centered column, generous whitespace. */

:root {
  --bg: #ffffff;
  --text: #1c1c1c;
  --muted: #6b6b6b;
  --accent: #2456a6;
  --accent-hover: #16386f;
  --rule: #e4e4e4;
  --callout-bg: #f4f7fc;
  --tag-bg: #eef2f9;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 44rem;
  margin: 0 auto;
  padding: 3.5rem 1.25rem 2rem;
}

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

/* ---------- Header ---------- */
header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.5rem;
  margin-bottom: 2.25rem;
}

h1 {
  margin: 0 0 0.4rem;
  font-size: 2rem;
  font-weight: 650;
  letter-spacing: -0.02em;
}

.tagline {
  margin: 0 0 0.75rem;
  color: var(--muted);
}

.links a {
  margin-right: 0.9rem;
  font-weight: 500;
}

.portrait {
  flex-shrink: 0;
  width: 150px;
  height: 150px;
  object-fit: cover;
  border-radius: 10px;
}

/* ---------- Sections ---------- */
section { margin-bottom: 2.5rem; }

h2 {
  font-size: 1.15rem;
  font-weight: 650;
  letter-spacing: 0.01em;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.35rem;
  margin: 0 0 1rem;
}

/* ---------- Biography ---------- */
#bio p { margin: 0 0 0.9rem; }

.callout {
  background: var(--callout-bg);
  border-left: 3px solid var(--accent);
  padding: 0.6rem 0.9rem;
  border-radius: 0 6px 6px 0;
}

.muted { color: var(--muted); }

.hero-callout { margin: -0.5rem 0 2.25rem; }

.pubs .pub-desc {
  font-size: 0.95rem;
  color: var(--muted);
  margin-top: 0.1rem;
}
/* ---------- News ---------- */
.news {
  list-style: none;
  margin: 0;
  padding: 0;
}

.news li {
  display: grid;
  grid-template-columns: 6rem 1fr;
  gap: 0.75rem;
  margin-bottom: 0.55rem;
}

.news .date {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* ---------- Publications ---------- */
.pubs {
  list-style: none;
  margin: 0;
  padding: 0;
}

.pubs li { margin-bottom: 1.25rem; }
.pubs p { margin: 0; }

.pub-title { font-weight: 600; }

.tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: var(--accent);
  background: var(--tag-bg);
  border-radius: 4px;
  padding: 0.05rem 0.45rem;
  margin-right: 0.35rem;
  vertical-align: 0.1em;
}

.pub-authors { font-size: 0.95rem; }

.pub-authors .me {
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: var(--rule);
  text-underline-offset: 3px;
}

.pub-venue {
  font-size: 0.95rem;
  color: var(--muted);
}

.pub-venue .venue { color: var(--text); }

.pub-links a {
  font-size: 0.85rem;
  font-weight: 550;
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 0.05rem 0.4rem;
  margin-left: 0.35rem;
}
.pub-links a:hover { text-decoration: none; border-color: var(--accent); }

/* ---------- Honors, Competitions ---------- */
.plain {
  list-style: none;
  margin: 0;
  padding: 0;
}

.plain li {
  margin-bottom: 0.45rem;
  padding-left: 1rem;
  position: relative;
}

.plain li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
}

/* ---------- Experience / Education ---------- */
.bg {
  list-style: none;
  margin: 0;
  padding: 0;
}

.bg li {
  display: grid;
  grid-template-columns: 6.5rem 1fr;
  gap: 0.75rem;
  margin-bottom: 0.7rem;
}

.bg-label {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* ---------- Footer ---------- */
footer {
  border-top: 1px solid var(--rule);
  padding-top: 1rem;
  font-size: 0.85rem;
  color: var(--muted);
}
footer p { margin: 0; }

/* ---------- Small screens ---------- */
@media (max-width: 560px) {
  main { padding-top: 2rem; }

  header {
    flex-direction: column-reverse;
    align-items: flex-start;
  }

  .portrait { width: 120px; height: 120px; }

  .news li,
  .bg li {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .news .date,
  .bg-label { font-size: 0.85rem; }
}