* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: #f4f6f8;
  color: #1f2933;
}

.container {
  width: min(900px, 92%);
  margin: 0 auto;
  padding: 56px 0;
}

.hero {
  background: white;
  padding: 56px;
  border-radius: 24px;
  box-shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
  margin-bottom: 28px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 13px;
  color: #2563eb;
  font-weight: 700;
  margin: 0 0 16px;
}

.profile-header {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 32px;
}

.profile-photo {
  width: 130px;
  height: 130px;
  border-radius: 999px;
  object-fit: cover;
  border: 3px solid #e5e7eb;
}

h1 {
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1;
  margin: 0 0 10px;
}

.subtitle {
  font-size: 24px;
  color: #475569;
  margin: 0;
  font-weight: 600;
}

.intro {
  font-size: 18px;
  line-height: 1.7;
  max-width: 760px;
  margin: 0 0 18px;
}

.email {
  font-size: 18px;
  font-weight: 700;
  margin: 24px 0 0;
  color: #111827;
}

.buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.button {
  display: inline-block;
  padding: 13px 18px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
  transition: transform 0.15s ease, opacity 0.15s ease;
}

.button:hover {
  transform: translateY(-2px);
  opacity: 0.9;
}

.primary {
  background: #111827;
  color: white;
}

.secondary {
  background: #e5e7eb;
  color: #111827;
}

.card {
  background: white;
  padding: 34px;
  border-radius: 20px;
  margin-bottom: 22px;
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.06);
}

.card h2 {
  margin-top: 0;
  font-size: 26px;
}

.card p,
.card li {
  font-size: 17px;
  line-height: 1.7;
}

ul {
  padding-left: 22px;
}

.timeline {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.timeline-item {
  display: flex;
  gap: 20px;
  padding: 16px 0;
  border-left: 2px solid #e5e7eb;
  padding-left: 20px;
  position: relative;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -6px;
  top: 22px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #2563eb;
  border: 2px solid white;
  outline: 2px solid #2563eb;
}

.timeline-date {
  font-size: 14px;
  font-weight: 700;
  color: #2563eb;
  white-space: nowrap;
  min-width: 90px;
  padding-top: 2px;
}

.timeline-item > div {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.timeline-item strong {
  font-size: 16px;
  color: #111827;
}

.timeline-place {
  font-size: 14px;
  color: #475569;
}

.paper {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.paper-title {
  font-size: 17px;
  font-weight: 700;
  margin: 0;
}

.paper-title a {
  color: #111827;
  text-decoration: none;
}

.paper-title a:hover {
  text-decoration: underline;
}

.paper-authors {
  font-size: 15px;
  color: #374151;
  margin: 0;
}

.paper-venue {
  font-size: 14px;
  color: #64748b;
  font-style: italic;
  margin: 0 0 6px;
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 18px;
}

.project-links a {
  color: #2563eb;
  font-weight: 700;
  text-decoration: none;
}

.project-links a:hover {
  text-decoration: underline;
}

footer {
  text-align: center;
  color: #64748b;
  padding: 24px 0 0;
}

@media (max-width: 640px) {
  .hero {
    padding: 34px 24px;
  }

  .card {
    padding: 26px 22px;
  }

  .intro {
    font-size: 16px;
  }

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

  .profile-photo {
    width: 105px;
    height: 105px;
  }
}