main {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}
.speaker {
  border-radius: 8px;
  box-shadow: 0 0px 12px rgba(0, 0, 0, 0.178);
  padding: 48px;
  width: 70%;
  border: 1px solid #e9ecef;
}

.date-header {
  text-align: center;
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid #e9ecef;
}

.date-header h1 {
  color: #495057;
  font-weight: 500;
}

.date-header datetime {
  color: #0066cc;
  font-weight: 600;
}

.date-header span {
  background: #495057;
  color: white;
  padding: 4px 12px;
  border-radius: 4px;
  margin-left: 12px;
}

.speaker-content {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 32px;
  align-items: start;
}

.speaker-photo {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid #e9ecef;
}

.speaker-info {
  padding-top: 8px;
}

.label {
  font-size: 1.3rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: #6c757d;
  font-weight: 600;
  margin-bottom: 8px;
}

.speaker-name {
  font-size: 2rem;
  font-weight: 600;
  color: #212529;
  margin-bottom: 8px;
  line-height: 1.3;
}

.speaker-position {
  font-size: 1.5rem;
  color: #6c757d;
  margin-bottom: 32px;
  line-height: 1.4;
}

.talk-title {
  font-size: 1.8rem;
  font-weight: 500;
  color: #212529;
  line-height: 1.4;
  margin-top: 8px;
}

@media (max-width: 640px) {
  .speaker {
    padding: 32px 24px;
    width: 90%;
  }

  .speaker-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 24px;
  }

  .speaker-photo {
    width: 140px;
    height: 140px;
    margin: 0 auto;
  }

  .speaker-name {
    font-size: 1.6rem;
  }

  .talk-title {
    font-size: 1.2rem;
  }
}