:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --text: #1a1a2e;
  --text-muted: #64748b;
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.08);
  --accent-medium: rgba(37, 99, 235, 0.15);
  --border: #e2e8f0;
  --hero-bg: #0f172a;
  --hero-text: #f1f5f9;
  --hero-muted: #94a3b8;
  --radius: 12px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.06);
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}

/* ========== HERO SECTION ========== */
.hero {
  background: var(--hero-bg);
  color: var(--hero-text);
  padding: 80px 0 60px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(37,99,235,0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(99,102,241,0.1) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 40px;
  display: flex;
  align-items: center;
  gap: 50px;
  position: relative;
  z-index: 1;
}

.avatar {
  width: 130px;
  height: 130px;
  border-radius: 50%;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 0 0 4px rgba(255,255,255,0.1), 0 20px 40px -15px rgba(0,0,0,0.4);
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-info { flex: 1; }

.hero-info h1 {
  font-family: 'Fredoka', sans-serif; /* Soft, rounded, and clean */
  font-size: 3.8rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin-bottom: 8px;
  line-height: 1.1;
  color: #fff; /* Solid white for a clean look */
  display: inline-block;
  transition: transform 0.3s var(--ease);
}

.hero-info h1:hover {
  transform: translateY(-2px);
}

.hero-info .tagline {
  font-size: 1.15rem;
  color: var(--hero-muted);
  margin-bottom: 25px;
  line-height: 1.5;
}

.hero-links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.hero-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  border-radius: 50px;
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s var(--ease);
}

.hero-link.primary {
  background: var(--accent);
  color: white;
}
.hero-link.primary:hover {
  background: #1d4ed8;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px -8px rgba(37,99,235,0.5);
}

.hero-link.secondary {
  background: rgba(255,255,255,0.08);
  color: var(--hero-muted);
  border: 1px solid rgba(255,255,255,0.1);
}
.hero-link.secondary:hover {
  background: rgba(255,255,255,0.15);
  color: var(--hero-text);
}

/* ========== MAIN CONTENT ========== */
.main {
  max-width: 960px;
  margin: 0 auto;
  padding: 40px 40px 80px;
}

/* Two-column grid */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  margin-bottom: 30px;
}

/* Section */
.section { margin-bottom: 30px; }

.section-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* Timeline items */
.timeline-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 14px 18px;
  margin-bottom: 8px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: all 0.3s var(--ease);
}

.timeline-item:hover {
  background: var(--surface);
  border-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.timeline-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
}

.timeline-sub {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.timeline-date {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
  margin-left: 15px;
  flex-shrink: 0;
}

/* Publication items */
.pub-list { display: flex; flex-direction: column; gap: 12px; }

.pub {
  display: flex;
  gap: 18px;
  padding: 20px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  transition: all 0.35s var(--ease);
}

.pub:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.pub-num {
  font-family: 'Playfair Display', serif;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent);
  opacity: 0.3;
  line-height: 1;
  flex-shrink: 0;
  width: 30px;
  text-align: right;
}

.pub-body { flex: 1; min-width: 0; }

.pub-name {
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1.4;
  margin-bottom: 6px;
  color: var(--text);
}

.pub-authors {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  line-height: 1.5;
}

.pub-venue-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.venue-badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 5px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  background: var(--accent-soft);
  color: var(--accent);
}

.venue-badge.highlight {
  background: var(--accent);
  color: white;
}

.role-tag {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--accent-medium);
  color: var(--accent);
}

/* Footer */
footer {
  text-align: center;
  padding: 40px;
  font-size: 0.82rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

/* Scroll animation */
.fade-in {
  opacity: 0;
  transform: translateY(25px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== RESPONSIVE ========== */
@media (max-width: 700px) {
  .hero-inner { flex-direction: column; text-align: center; gap: 25px; }
  .hero-links { justify-content: center; }
  .hero-info h1 { font-size: 2.2rem; }
  .grid-2 { grid-template-columns: 1fr; gap: 10px; }
  .main { padding: 40px 20px 60px; }
  .hero { padding: 50px 0 40px; }
  .timeline-item { flex-direction: column; gap: 4px; }
  .timeline-date { margin-left: 0; }
  .pub { flex-direction: column; gap: 10px; }
  .pub-num { width: auto; text-align: left; }
}