@import url('https://fonts.googleapis.com/css2?family=Ubuntu:wght@500&display=swap');

:root {
  --cl-yellow: #ff0;
  --cl-black: #111;
  --cl-black-light: #333;
  --cl-gray: #bdbdbd;
  --cl-gray-dark: #777;
  --cl-white: #fff;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
/* --header */
.header {
  display: grid;
  grid-template-columns: 1fr 1fr;
}
.header .header_banner {
  position: relative;
  height: 100vh;
}
.header .header_banner:last-child {
  background: var(--cl-yellow);
}
/* --header --header_intro */
.header .header_intro {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px 60px;
}

/* --header --header_intro --header_navbar*/
.header_navbar {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  display: flex;
  justify-content: space-between;
  padding: 20px 60px;
  align-items: center;
}
.header_navbar .logo_name {
  position: relative;
  font-size: 1.5em;
  color: var(--cl-black);
  font-weight: 700px;
  text-decoration: none;
}
.header_navbar .header_navbar-menu {
  display: flex;
  list-style: none;
}
.header_navbar-menu .menu_item {
  margin-left: 30px;
}
.header_navbar-menu .menu_item a {
  text-decoration: none;
  font-weight: 500;
  color: var(--cl-gray);
  letter-spacing: 1px;
}
.header_navbar-menu .menu_item a:hover {
  color: var(--cl-black-light);
}
/* --header --header_intro --header_content */
.header_content h2 {
  font-size: 4em;
  color: var(--cl-black-light);
}
.header_content p {
  font-size: 1.2em;
  color: var(--cl-gray-dark);
  line-height: 1.8em;
}
.btn-readMore {
  display: inline-block;
  font-size: 1.3em;
  margin-top: 20px;
  color: var(--cl-black-light);
  text-decoration: none;
  font-weight: 500;
  border: 2px solid var(--cl-black-light);
  padding: 10px 30px;
  letter-spacing: 1px;
  transition: 0.5s;
}
.btn-readMore:hover {
  background-color: var(--cl-black-light);
  color: var(--cl-white);
  letter-spacing: 2px;
}

/* --header --header_intro --header-socialIcon */
.header_socialIcons {
  position: absolute;
  bottom: 20px;
  right: 30px;
  display: flex;
  justify-content: center;
  align-items: center;
}
.header_socialIcons h3 {
  font-weight: 500;
  color: var(--cl-gray);
  letter-spacing: 1px;
}
.header_socialIcons li.social-icon {
  margin-left: 20px;
}
.header_socialIcons .social-icon img {
  max-width: 30px;
  max-height: 30px;
}

/* --header --header_library */
.header_library {
  display: flex;
  flex-wrap: wrap;
}

.header_library .library-box {
  position: relative;
  width: 50%;
  height: 50vh;
}
.header_library .library-box:nth-child(3) {
  width: 100%;
}

.header_library .library-box img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ______________responsive______________ */

@media (max-width: 991px) {
  .header {
    grid-template-columns: 1fr;
  }
  .header .header_banner.header_intro {
    padding: 20px 40px;
    height: 60vh;
  }
  .header .header_intro .header_navbar {
    padding: 40px;
  }
  .header .header_banner.header_library {
    height: auto;
  }
}

@media (max-width: 600px) {
  .header_intro .header_content h2 {
    font-size: 3em;
  }
  .header_library .library-box {
    position: relative;
    width: 100%;
    height: 40vh;
  }
}