.main {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  margin: 38px auto 50px;
  width: 1200px;
  height: 805px;
}
.main__category {
  width: 662px;
  height: 332px;
  margin-bottom: 16px;
}
.main__category_articles {
  height: 258px;
}
.main__category_articles .detail .title {
  width: 540px;
}
.main__search {
  width: 478px;
  height: 347px;
}
.main__search_title {
  font-size: 24px;
  font-family: source han sans cn;
  font-weight: bold;
  color: #1a1a1a;
}
.main__search_form {
  margin-top: 18px;
  padding-top: 25px;
  width: 478px;
  height: 305px;
  background-color: #f5f6fa;
  border-radius: 4px;
}
.main__search_form_item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 48px;
  margin-bottom: 20px;
}
.main__search_form_item .desc {
  margin-left: 23px;
  font-size: 18px;
  font-family: source han sans cn;
  font-weight: 400;
  color: #333333;
}
.main__search_form_item .val,
.main__search_form_item .select {
  margin-right: 24px;
  width: 336px;
  height: 48px;
  border: 1px solid #cccccc;
  border-radius: 2px;
  outline: none;
}
.main__search_form_item .val {
  padding-left: 11px;
  font-size: 18px;
  font-family: source han sans cn;
  font-weight: 400;
}
.main__search_form_item .val::-webkit-input-placeholder {
  color: #ccc;
}
.main__search_form_item .val::-moz-placeholder {
  color: #ccc;
}
.main__search_form_item .select:valid {
  padding-left: 7px;
  font-size: 18px;
  font-family: source han sans cn;
  font-weight: 400;
  color: #000;
}
.main__search_form_submit {
  margin: 0 23px;
  width: 431px;
  height: 54px;
  background-color: #3b64cd;
  border-radius: 2px;
  font-size: 22px;
  font-family: source han sans cn;
  font-weight: 400;
  color: #ffffff;
  border: none;
  cursor: pointer;
}
.main__search_form_submit a {
  display: inline-block;
  width: 100%;
  height: 100%;
  text-align: center;
  line-height: 54px;
}
.main__columns {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 31px;
  width: 1200px;
  height: 243px;
}
.main__columns .column {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 300px;
  height: 220px;
  transition: all 0.3s ease-in-out;
  -webkit-transition: all 0.3s ease-in-out;
  -moz-transition: all 0.3s ease-in-out;
  -o-transition: all 0.3s ease-in-out;
}
.main__columns .column .logo {
  width: 72px;
  height: 72px;
}
.main__columns .column .name {
  margin-top: 25px;
  font-size: 20px;
  font-family: source han sans cn;
  font-weight: 400;
  color: #ffffff;
}
.main__columns .column:hover {
  transform: scale(1.1);
  -webkit-transform: scale(1.1);
  -moz-transform: scale(1.1);
  -o-transform: scale(1.1);
  -ms-transform: scale(1.1);
}
.main__columns_institution {
  background-color: #184ca7;
}
.main__columns_institution .logo {
  background:  no-repeat 0 0 / cover;
}
.main__columns_guide {
  background-color: #2f77c8;
}
.main__columns_guide .logo {
  background:  no-repeat 0 0 / cover;
}
.main__columns_protocol {
  background-color: #3f7cc0;
}
.main__columns_protocol .logo {
  background:  no-repeat 0 0 / cover;
}
.main__columns_directory {
  background-color: #6096d0;
}
.main__columns_directory .logo {
  background:  no-repeat 0 0 / cover;
}
.main__specials {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  margin-top: 32px;
  width: 1200px;
  height: 150px;
}
.main__specials img {
  margin-top: 19px;
}