* {
  box-sizing: border-box;
}
:root {
  font-size: 62.5%;
  scroll-behavior: smooth;
}
body {
  font-size: 1.6rem;
  font-family: 'Roboto', sans-serif;
  color: #333;
}
#boutton_ancre {
  position: relative;
  top: 110px;
  left: 63px;
  width: 90px;
  height: 81px;
  cursor: pointer;
  border-radius: 44px;
  cursor: pointer;
  border: none;
}

header h1 {
  font-weight: 100;
  line-height: 15rem;
  text-align: center;
  font-size: 5rem;
}
.container {
  max-width: 90rem;
  margin: 0 auto;
}
nav ul {
  text-align: center;
  margin: 0;
  padding: 0;
}
nav ul li {
  display: inline-block;
  text-transform: uppercase;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
  margin-bottom: 3rem;
  letter-spacing: 0.2rem;
}
nav ul li a {
  color: #a7b6b9;
  text-decoration: none;
  transition: box-shadow 0.5s, color 0.1s;
  font-weight: 300;
}
nav ul li a.active {
  box-shadow: inset 0 -6px 0px #edea98;
  color: #345;
}
nav ul li a:hover {
  box-shadow: inset 0 -6px 0px #edea98;
}
.gallery {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
}
.imageGallery img {
  width: 100%;
  display: block;
}

.imageGallery {
  margin: 2rem 1rem 2rem 1rem;
  max-width: 400px;
  opacity: 1; /* pour animation */
  transition: opacity 0.5s linear, 0.5s transform ease-in-out;
  cursor: pointer;
}

.imageGallery:hover {
  transform: scale(1.05);
}
.blocTitreGallery {
  text-align: center;
}
.blocTitreGallery h3 {
  color: #345;
  margin: 2rem 0 0.5rem 0;
  padding: 0;
  font-size: 1.6rem;
  font-weight: 500;
  text-transform: uppercase;
}
.blocTitreGallery h6 {
  color: #a7b6b9;
  margin: 0;
  padding: 0;
  font-size: 1.4rem;
  font-weight: 200;
}

.hide {
  opacity: 0;
  width: 0;
  height: 0;
  margin: 0;
  padding: 0;
  visibility: hidden;
  transition: opacity 0.2s;
}

/* Modal */
#modal {
  position: fixed;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 1;
  transition: opacity 0.2s linear;
}

.imageModal {
  width: 60%;
  position: relative;
  opacity: 1;
}
.imageModal img {
  width: 100%;
}
.imageModal span {
  position: absolute;
  top: 1rem;
  right: 1rem;
  color: white;
  font-size: 2rem;
  cursor: pointer;
  transition: color 0.3s;
}
.imageModal span:hover {
  color: #333;
}