body {
  margin: 0;
  font-family: "Makinas4-Flat", Arial, sans-serif;
  overflow-x: hidden;
  background-image: url("/top_image/link_beta06.png");
  background-size: cover;
}

header {
  background-color: #3b4140;
  color: white;
  padding: 17px 20px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.logo-img {
  max-height: 40px;
  width: auto;
  vertical-align: middle;
  color: white;
  margin-left: -160px;
}

.naviheader {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  height: 100%;
  margin-left: -15%;
}
.mark-img {
  display: flex;
  align-items: center;
  max-width: 500px;
  width: 250px;
  padding-bottom: 12px;
  padding-left: 200px;
  margin: -50px;
}

.hamburger-menu {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 30px;
  height: 25px;
  cursor: pointer;
  position: relative;
  z-index: 1000;
}

.hamburger-menu .bar {
  width: 100%;
  height: 3px;
  background-color: white;
  transition: all 0.3s ease;
}

.nav-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  margin-right: -25%;
}

.nav-links li {
  margin-left: 60px;
}

.nav-links a {
  color: white;
  text-decoration: none;
  font-size: 18px;
  padding: 10px 0;
  transition: color 0.3s ease;
}

.nav-links a:hover {
  color: #69d7d2;
}

.topback{
  background-color: rgb(255 255 255 / 50%);
  margin: 0 auto;
  text-align: center;
}

@font-face {
  font-family: 'Makinas4-Flat';
  src: url('../glo_font/makinas4-flat.woff2') format('woff2'),
       url('../glo_font/makinas4-flat.woff') format('woff');
  font-weight: normal;
  font-style: normal;
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 70px;
    right: 0;
    background-color: #3b4140;
    width: 100%;
    flex-direction: column;
    text-align: center;
  }

  .nav-links.active {
    display: flex;
  }
  
  .hamburger-menu.active .bar:nth-child(1) {
    transform: translateY(11px) rotate(45deg);
  }
  .hamburger-menu.active .bar:nth-child(2) {
    opacity: 0;
  }
  .hamburger-menu.active .bar:nth-child(3) {
    transform: translateY(-11px) rotate(-45deg);
  }

  .hamburger-menu {
    display: flex;
  }

  .logo-img {
    margin-left: 0;
  }
}