/* ── Reset & base ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --accent:       #0066ff;
  --accent-light: #dce8ff;
  --accent-mid:   #4d94ff;
  --accent-glow:  rgba(0,102,255,.18);
  --primary:      #0a1628;
  --text:         #1e3a5f;
  --muted:        #5a7a9f;
  --border:       #d4e0f0;
  --bg:           #f5f8fd;
  --bg-alt:       #edf2ff;
  --card:         #ffffff;
  --radius:       12px;
  --shadow:       0 2px 8px rgba(10,22,40,.09), 0 12px 32px rgba(10,22,40,.11);
  --shadow-sm:    0 1px 4px rgba(10,22,40,.08);
  --gradient:     linear-gradient(135deg, #0066ff 0%, #06b6d4 100%);

  --journal:    #00a878;
  --conference: #0891b2;
  --workshop:   #7c22e8;
  --thesis:     #ea580c;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }

::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--accent-mid); border-radius: 99px; }

/* ── Nav ──────────────────────────────────────────────────── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav-name {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: .95rem;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -.02em;
  white-space: nowrap;
}

.nav-links { display: flex; gap: 0; list-style: none; }

.nav-links a {
  display: inline-block;
  padding: .3rem .6rem;
  font-size: .8rem;
  font-weight: 600;
  color: var(--muted);
  border-radius: 99px;
  transition: color .15s, background .15s;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
  background: var(--accent-light);
  text-decoration: none;
}

/* ── Container ────────────────────────────────────────────── */
.container { max-width: 860px; margin: 0 auto; padding: 0 1.5rem; }

/* ── Section ──────────────────────────────────────────────── */
section { padding: 5.5rem 0; }
section + section { border-top: 1px solid var(--border); }

#publications { background: var(--bg-alt); }

/* ── Section title ────────────────────────────────────────── */
.section-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -.04em;
  line-height: 1.1;
  margin-bottom: 2.5rem;
}

.section-title::before {
  content: '';
  display: block;
  width: 3rem;
  height: 4px;
  background: var(--gradient);
  border-radius: 2px;
  margin-bottom: .75rem;
}

/* ── Hero ─────────────────────────────────────────────────── */
#hero {
  padding: 7rem 0 6rem;
  background: linear-gradient(135deg, #050f1f 0%, #0a1e3d 55%, #041020 100%);
  border-bottom: none;
  position: relative;
  overflow: hidden;
}

#hero::before {
  content: '';
  position: absolute;
  width: 700px;
  height: 700px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0,102,255,.35) 0%, transparent 65%);
  top: -280px;
  right: -180px;
  pointer-events: none;
}

#hero::after {
  content: '';
  position: absolute;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(6,182,212,.22) 0%, transparent 70%);
  bottom: -160px;
  left: 35%;
  pointer-events: none;
}

.hero-inner {
  display: flex;
  align-items: center;
  gap: 3rem;
  position: relative;
  z-index: 1;
}

.hero-avatar {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 3px solid rgba(77,148,255,.55);
  box-shadow: 0 0 0 8px rgba(0,102,255,.16), 0 16px 48px rgba(0,0,0,.4);
}

.hero-avatar-placeholder {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: rgba(0,102,255,.12);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--accent-mid);
  border: 3px solid rgba(77,148,255,.35);
  box-shadow: 0 0 0 8px rgba(0,102,255,.1);
}

.hero-text h1 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 3.4rem;
  font-weight: 700;
  color: #f1f5f9;
  letter-spacing: -.04em;
  line-height: 1.05;
  margin-bottom: .5rem;
}

.hero-role {
  font-size: .92rem;
  color: var(--accent-mid);
  font-weight: 600;
  margin-bottom: 1.6rem;
  letter-spacing: -.01em;
  opacity: .9;
}

.hero-bio {
  font-size: .93rem;
  color: #94a3b8;
  max-width: 520px;
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.hero-links { display: flex; flex-wrap: wrap; gap: .5rem; }

.hero-link {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .42rem .9rem;
  border: 1.5px solid rgba(255,255,255,.14);
  border-radius: 99px;
  font-size: .8rem;
  font-weight: 600;
  color: #e2e8f0;
  background: rgba(255,255,255,.06);
  transition: all .2s;
}
.hero-link:hover {
  border-color: rgba(77,148,255,.65);
  color: #7ab8ff;
  background: rgba(0,102,255,.2);
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0,102,255,.25);
}
.hero-link svg { width: 14px; height: 14px; }

/* ── About ────────────────────────────────────────────────── */
.interests-grid { display: flex; flex-wrap: wrap; gap: .55rem; }

.interest-tag {
  padding: .42rem 1.05rem;
  border-radius: 99px;
  font-size: .82rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-light);
  border: 1.5px solid rgba(79,70,229,.2);
  letter-spacing: -.01em;
  transition: all .2s;
  cursor: default;
}
.interest-tag:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(0,102,255,.32);
}

/* ── Publications ─────────────────────────────────────────── */
.pub-filters { display: flex; flex-wrap: wrap; gap: .4rem; margin-bottom: 2rem; }

.pub-filter {
  padding: .35rem .9rem;
  border: 1.5px solid var(--border);
  border-radius: 99px;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--muted);
  background: var(--card);
  cursor: pointer;
  transition: all .15s;
}
.pub-filter:hover,
.pub-filter.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}

.pub-year-group { margin-bottom: 2.5rem; }

.pub-year-header {
  font-family: 'Space Grotesk', sans-serif;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: .75rem;
}
.pub-year-header::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, rgba(79,70,229,.3), transparent);
}

.pub-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin-bottom: .65rem;
  box-shadow: var(--shadow-sm);
  display: grid;
  grid-template-columns: 6px 1fr;
  gap: 0 1rem;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s;
}
.pub-card:hover { transform: translateY(-3px); }

.pub-card[data-type="journal"]:hover {
  border-color: var(--journal);
  box-shadow: 0 8px 24px rgba(0,168,120,.18), 0 1px 4px rgba(10,22,40,.06);
}
.pub-card[data-type="conference"]:hover {
  border-color: var(--conference);
  box-shadow: 0 8px 24px rgba(8,145,178,.18), 0 1px 4px rgba(10,22,40,.06);
}
.pub-card[data-type="workshop"]:hover {
  border-color: var(--workshop);
  box-shadow: 0 8px 24px rgba(124,34,232,.18), 0 1px 4px rgba(10,22,40,.06);
}
.pub-card[data-type="thesis"]:hover {
  border-color: var(--thesis);
  box-shadow: 0 8px 24px rgba(234,88,12,.18), 0 1px 4px rgba(10,22,40,.06);
}

.pub-type-stripe { border-radius: 99px; align-self: stretch; }
.pub-type-stripe.journal    { background: var(--journal); }
.pub-type-stripe.conference { background: var(--conference); }
.pub-type-stripe.workshop   { background: var(--workshop); }
.pub-type-stripe.thesis     { background: var(--thesis); }

.pub-body { min-width: 0; }

.pub-meta { display: flex; align-items: center; flex-wrap: wrap; gap: .35rem; margin-bottom: .3rem; }

.pub-type-badge {
  font-size: .65rem;
  font-weight: 700;
  letter-spacing: .07em;
  text-transform: uppercase;
  padding: .14rem .5rem;
  border-radius: 4px;
  white-space: nowrap;
}
.pub-type-badge.journal    { background: #ccf5e8; color: var(--journal); }
.pub-type-badge.conference { background: #cff6fe; color: var(--conference); }
.pub-type-badge.workshop   { background: #ede8fe; color: var(--workshop); }
.pub-type-badge.thesis     { background: #fde8d8; color: var(--thesis); }

.pub-title {
  font-size: .95rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: .28rem;
  letter-spacing: -.015em;
  line-height: 1.4;
}
.pub-title a { color: inherit; }
.pub-title a:hover { color: var(--accent); text-decoration: none; }

.pub-authors { font-size: .82rem; color: var(--muted); margin-bottom: .22rem; line-height: 1.5; }
.pub-authors strong { color: var(--text); font-weight: 600; }

.pub-venue { font-size: .8rem; color: var(--muted); font-style: italic; margin-bottom: .35rem; }

.pub-actions { display: flex; flex-wrap: wrap; gap: .35rem; margin-top: .45rem; align-items: center; }

.pub-action-btn {
  display: inline-flex;
  align-items: center;
  gap: .28rem;
  font-size: .72rem;
  font-weight: 700;
  padding: .24rem .6rem;
  border-radius: 6px;
  border: 1.5px solid var(--border);
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  letter-spacing: .02em;
  transition: all .15s;
  text-decoration: none;
}
.pub-action-btn:hover { color: var(--accent); border-color: var(--accent); background: var(--accent-light); text-decoration: none; }
.pub-action-btn svg { width: 11px; height: 11px; }
.pub-action-btn.pdf { color: var(--accent); border-color: var(--accent); background: var(--accent-light); }

.pub-note { font-size: .76rem; color: var(--muted); font-style: italic; margin-top: .3rem; }

/* ── Experience ───────────────────────────────────────────── */
.exp-section {
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
}
.exp-section:first-child { border-top: none; padding-top: 0; }

/* Timeline */
.timeline { display: flex; flex-direction: column; }

.tl-item {
  display: grid;
  grid-template-columns: 88px 1fr;
  gap: 0 1.25rem;
  padding-bottom: 1.75rem;
}
.tl-item:last-child { padding-bottom: 0; }

.tl-date {
  text-align: right;
  font-size: .75rem;
  font-weight: 600;
  color: var(--muted);
  padding-top: .2rem;
  line-height: 1.4;
  white-space: pre-line;
}

.tl-content {
  border-left: 3px solid var(--accent);
  padding-left: 1.25rem;
  position: relative;
}
.tl-content::before {
  content: '';
  position: absolute;
  left: -7px;
  top: .4rem;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--gradient);
  box-shadow: 0 0 0 3px var(--bg), 0 0 0 5px rgba(0,102,255,.28);
}

.tl-title { font-size: .93rem; font-weight: 700; color: var(--primary); margin-bottom: .12rem; line-height: 1.35; }
.tl-org   { font-size: .81rem; color: var(--accent); font-weight: 600; margin-bottom: .28rem; }
.tl-desc  { font-size: .83rem; color: var(--muted); line-height: 1.6; }
.tl-desc ul { margin-left: 1rem; margin-top: .2rem; }
.tl-desc li { margin-bottom: .18rem; }

.exp-subheading {
  font-family: 'Space Grotesk', sans-serif;
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 2.25rem 0 1.35rem;
  padding-bottom: .5rem;
  border-bottom: 2px solid var(--accent-light);
}
.exp-subheading:first-child { margin-top: 0; }

.exp-sub-subheading {
  font-family: 'Space Grotesk', sans-serif;
  font-size: .68rem;
  font-weight: 700;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 1.75rem 0 1rem;
}

/* Awards */
.awards-list { list-style: none; display: flex; flex-direction: column; gap: .6rem; }

.award-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: .9rem 1.1rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  gap: .8rem;
  align-items: flex-start;
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.award-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: var(--accent-mid);
}

.award-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--gradient);
  flex-shrink: 0;
  margin-top: .45rem;
  box-shadow: 0 2px 8px rgba(79,70,229,.3);
}
.award-text { font-size: .86rem; color: var(--text); }
.award-year { font-size: .75rem; font-weight: 700; color: var(--muted); margin-top: .1rem; }

/* ── Footer ───────────────────────────────────────────────── */
footer {
  background: var(--primary);
  padding: 2.5rem 0;
  border-top: none;
}

.footer-inner {
  font-size: .78rem;
  color: #64748b;
  text-align: center;
}
.footer-inner a { color: #4d94ff; }
.footer-inner a:hover { color: #80b8ff; }
.footer-inner code {
  font-size: .76rem;
  background: rgba(255,255,255,.07);
  color: #80b8ff;
  padding: .05rem .35rem;
  border-radius: 4px;
}

/* ── Fade-in ──────────────────────────────────────────────── */
.fade-in { opacity: 0; transform: translateY(16px); transition: opacity .5s ease, transform .5s ease; }
.fade-in.visible { opacity: 1; transform: none; }

/* ── Hamburger button ─────────────────────────────────────── */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  background: none;
  border: none;
  cursor: pointer;
  flex-shrink: 0;
  border-radius: 8px;
  transition: background .15s;
}
.nav-hamburger:hover { background: var(--accent-light); }
.nav-hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform .25s, opacity .25s;
  transform-origin: center;
}
.nav-hamburger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-hamburger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Mobile menu dropdown ─────────────────────────────────── */
.nav-mobile-menu {
  display: none;
  position: fixed;
  top: 60px;
  left: 0;
  right: 0;
  z-index: 99;
  background: rgba(255,255,255,.97);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  flex-direction: column;
  padding: .5rem 1rem .75rem;
  box-shadow: 0 8px 24px rgba(10,22,40,.1);
}
.nav-mobile-menu.open { display: flex; }
.nav-mobile-menu a {
  padding: .7rem .85rem;
  font-size: .92rem;
  font-weight: 600;
  color: var(--muted);
  border-radius: 8px;
  transition: color .15s, background .15s;
}
.nav-mobile-menu a:hover,
.nav-mobile-menu a.active {
  color: var(--accent);
  background: var(--accent-light);
  text-decoration: none;
}

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 640px) {
  nav { padding: 0 1rem; overflow: visible; }
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .nav-name { font-size: .88rem; }

  .container { padding: 0 1rem; }
  .hero-inner { flex-direction: column; align-items: flex-start; gap: 1.25rem; }
  .hero-avatar, .hero-avatar-placeholder { width: 90px; height: 90px; }
  .hero-text h1 { font-size: 2.1rem; }
  .section-title { font-size: 1.85rem; }
  .tl-item { grid-template-columns: 68px 1fr; }
  section { padding: 3.75rem 0; }
}

@media (max-width: 768px) {
  .tl-item { grid-template-columns: 72px 1fr; }
  .hero-text h1 { font-size: 2.6rem; }
}