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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: hsl(210, 46%, 95%);
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  padding: 1rem;
}

.container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background-color: white;
  max-width: 900px;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
}

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

.contact-start {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.contact-start h2 {
  font-size: 1.25rem;
  color: hsl(217, 19%, 35%);
  margin-bottom: 1rem;
}

.contact-start p {
  color: hsl(214, 17%, 51%);
  line-height: 1.5;
}

.contact-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 2rem;
  position: relative;
}

.contact-info img {
  border-radius: 50%;
  width: 40px;
  height: 40px;
}

.author {
  margin-left: 1rem;
  flex: 1;
}

.author h3 {
  font-size: 0.9rem;
  color: hsl(217, 19%, 35%);
}

.author p {
  font-size: 0.8rem;
  color: hsl(212, 23%, 69%);
}

.share-button-wrapper {
  position: relative;
}

#share-button {
  background-color: hsl(210, 46%, 95%);
  border: none;
  border-radius: 50%;
  padding: 0.5rem;
  cursor: pointer;
}

.share-popup {
  display: none;
  position: absolute;
  bottom: 140%;
  left: 50%;
  transform: translateX(-50%);
  background-color: hsl(217, 19%, 35%);
  color: white;
  padding: 0.75rem 1rem;
  border-radius: 10px;
  display: none;
  gap: 0.75rem;
  align-items: center;
  font-size: 12px;
  letter-spacing: 3px;
  z-index: 10;
}

.share-popup.active {
  display: flex;
}

.share-popup::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  margin-left: -6px;
  border-width: 6px;
  border-style: solid;
  border-color: hsl(217, 19%, 35%) transparent transparent transparent;
}

.share-popup img {
  width: 16px;
  height: 16px;
  cursor: pointer;
}

@media (max-width: 768px) {
  .container {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto;
  }

  .img-start img {
    height: auto;
  }

  .contact-start {
    padding: 1.5rem;
  }

  .share-popup {
    bottom: auto;
    top: -70px;
    left: 50%;
    transform: translateX(-50%);
  }

  .share-popup::after {
    top: auto;
    bottom: -12px;
    border-color: transparent transparent hsl(217, 19%, 35%) transparent;
  }
}