@import url('https://fonts.googleapis.com/css2?family=Sora:wght@300;400;500;600;700&display=swap');

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --indigo:  #4f46e5;
  --violet:  #7c3aed;
  --teal:    #0891b2;
  --text:    #111;
  --muted:   #4b5563;
  --light:   #9ca3af;
  --border:  #e5e7eb;
  --bg-tint: #f5f3ff;
  --sans:    'Sora', system-ui, sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  font-weight: 300;
  color: var(--text);
  background: #fff;
  font-size: 15.5px;
  line-height: 1.75;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--indigo); }

/* ── TOP NAV ─────────────────────────────── */
.top-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.top-nav-inner {
  max-width: 740px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
}

.top-nav a {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--light);
  padding: 0.75rem 0.9rem;
  display: inline-block;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}

.top-nav a:hover { color: var(--indigo); border-bottom-color: transparent; }
.top-nav a.active { color: var(--indigo); border-bottom-color: var(--indigo); }

/* ── HEADER ──────────────────────────────── */
.site-header {
  background: linear-gradient(135deg, var(--bg-tint) 0%, #fff 60%);
  border-bottom: 1px solid #e8e4ff;
}

.site-header-inner {
  max-width: 740px;
  margin: 0 auto;
  padding: 3.5rem 2rem 3rem;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 2rem;
}

.header-text { flex: 1; }

.header-text h1 {
  font-family: var(--sans);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  white-space: nowrap;
  color: var(--text);
  margin-bottom: 0.45rem;
}

.header-role {
  font-size: 0.93rem;
  color: var(--muted);
  margin-bottom: 0.15rem;
}

.header-email {
  font-size: 0.82rem;
  color: var(--light);
  font-family: monospace;
  margin-bottom: 1.1rem;
}

.header-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.header-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--indigo);
  background: #ede9fe;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  transition: background 0.15s, color 0.15s;
}

.header-links a:hover {
  background: var(--indigo);
  color: #fff;
}

.profile-pic {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid #fff;
  box-shadow: 0 0 0 3px #c4b5fd;
  flex-shrink: 0;
}

/* ── MAIN ────────────────────────────────── */
.site-main {
  max-width: 740px;
  margin: 0 auto;
  padding: 0 2rem 5rem;
}

/* ── SECTIONS ────────────────────────────── */
section {
  padding: 2.8rem 0 0.5rem;
}

section > h2 {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--indigo);
  margin-bottom: 1.6rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

section > h2::after {
  content: none;
}

/* ── ABOUT ───────────────────────────────── */
#about p { font-size: 0.95rem; margin-bottom: 0.9rem; max-width: 66ch; }
#about p:last-child { margin-bottom: 0; }

/* ── RESEARCH INTERESTS ──────────────────── */
.interests {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.4rem;
}

.interest-tag {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.3rem 0.85rem;
  border-radius: 20px;
  border: 1.5px solid;
  letter-spacing: 0.01em;
}

.tag-purple { color: #6d28d9; border-color: #c4b5fd; background: #f5f3ff; }
.tag-teal   { color: #0e7490; border-color: #a5f3fc; background: #ecfeff; }
.tag-rose   { color: #be185d; border-color: #fbcfe8; background: #fdf2f8; }
.tag-amber  { color: #b45309; border-color: #fde68a; background: #fffbeb; }
.tag-indigo { color: #4338ca; border-color: #c7d2fe; background: #eef2ff; }
.tag-green  { color: #15803d; border-color: #bbf7d0; background: #f0fdf4; }

/* ── AWARDS ──────────────────────────────── */
.award-list { list-style: none; }

.award-item {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: 0 1rem;
  padding: 0.7rem 0;
  font-size: 0.91rem;
  align-items: baseline;
}

.award-year {
  color: var(--teal);
  font-size: 0.8rem;
  font-weight: 600;
}

.award-name { font-weight: 600; margin-bottom: 0.05rem; }
.award-desc { font-size: 0.85rem; color: var(--muted); }

/* ── NEWS ────────────────────────────────── */
.news-table { width: 100%; border-collapse: collapse; }

.news-table tr { border-bottom: none; }

.news-table td {
  padding: 0.55rem 0;
  font-size: 0.91rem;
  vertical-align: top;
}

.news-table .nd {
  color: var(--teal);
  font-size: 0.79rem;
  font-weight: 600;
  white-space: nowrap;
  padding-right: 1.8rem;
  width: 80px;
  padding-top: 0.62rem;
}

/* ── PUBLICATIONS ────────────────────────── */
.pub-list { list-style: none; }

.pub-entry {
  padding: 1.1rem 0;
}

.pub-idx { display: none; }

.pub-title {
  font-family: var(--sans);
  font-size: 0.97rem;
  font-weight: 600;
  line-height: 1.45;
  margin-bottom: 0.25rem;
}

.pub-authors {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.4rem;
  line-height: 1.5;
}

.pub-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
}

/* venue pill — coloured per conference */
.pub-venue {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  padding: 0.1rem 0.55rem;
  border-radius: 20px;
  color: #fff;
}

.v-neurips  { background: #6d28d9; }
.v-icml     { background: #047857; }
.v-workshop { background: #7c3aed; opacity: 0.85; }
.v-aaai     { background: #1d4ed8; }
.v-acl      { background: #0f766e; }
.v-ijcnn    { background: #b45309; }
.v-patent   { background: #374151; }

.pub-link {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--indigo);
  background: #ede9fe;
  padding: 0.1rem 0.55rem;
  border-radius: 20px;
  transition: background 0.15s, color 0.15s;
}

.pub-link:hover { background: var(--indigo); color: #fff; }

/* ── SERVICE ─────────────────────────────── */
#service p { font-size: 0.93rem; margin-bottom: 0.55rem; }
#service p:last-child { margin-bottom: 0; }

/* ── VITA ────────────────────────────────── */
.vita-pdf { font-size: 0.88rem; color: var(--muted); margin-bottom: 1.4rem; }
.vita-pdf a { color: var(--indigo); border-bottom: 1px solid #c4b5fd; }
.vita-pdf a:hover { color: var(--violet); }

.vita-list { list-style: none; }

.vita-item {
  display: grid;
  grid-template-columns: 10rem 1fr;
  gap: 0 1.5rem;
  padding: 0.85rem 0;
  font-size: 0.91rem;
}

.vita-time {
  color: var(--light);
  font-size: 0.79rem;
  padding-top: 0.12rem;
}

.vita-place { font-weight: 600; margin-bottom: 0.1rem; }
.vita-role  { color: var(--muted); font-size: 0.86rem; }

/* ── FOOTER ──────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  max-width: 740px;
  margin: 0 auto;
  padding: 1.5rem 2rem;
  font-size: 0.78rem;
  color: var(--light);
}

/* ── RESPONSIVE ──────────────────────────── */
@media (max-width: 580px) {
  .site-header-inner { flex-direction: column-reverse; align-items: center; text-align: center; padding-top: 2rem; }
  .header-text h1    { font-size: 1.7rem; }
  .header-links      { justify-content: center; }
  .top-nav-inner     { flex-wrap: wrap; }
  .top-nav a         { padding: 0.6rem 0.5rem; font-size: 0.72rem; }
  .pub-entry         { grid-template-columns: 1fr; }
  .pub-idx           { display: none; }
  .vita-item         { grid-template-columns: 1fr; gap: 0.1rem; }
}