.header_div {
  width: 95%;
  position: sticky;
  top: 0;
  left: 0;
  background: var(--header-gradient);
  border-bottom-left-radius: 42px;
  border-bottom-right-radius: 42px;
  z-index: 100;
}

header {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  border-radius: 50px;
  border: 1px solid var(--c-line);
  background: var(--header-gradient);
  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr="#1d2829",endColorstr="#1d2829",GradientType=1);
  box-shadow: var(--shadow-2);
  transition: top 0.3s ease-in-out;
  margin-top: 15px;
  z-index: 100;
}

.menu {
  display: flex;
  align-items: center;
  justify-content: center;
  list-style: none;
  flex-wrap: wrap;
  padding: 0;
}

.menu_wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
}

.menu li {
  margin: 10px 14px;
  transition: 0.3s;
  font-size: var(--f-size-b1);
  line-height: var(--lh-b1);
  color: var(--c-text);
}

.menu li a {
  color: var(--c-white);
  transition: var(--transition);
  font-size: 13px;
  font-weight: 300;
  text-transform: uppercase;
}

.menu li a.active {
  opacity: 1;
  color: var(--c-secondary);
}

.logo {
  font-size: 1.5rem;
  font-weight: 300;
  letter-spacing: 2px;
}

.letter_logo {
  width: 20px;
  height: 22px;
  margin-bottom: -2px;
}

.contact-btn {
  font-size: 14px;
  font-weight: 300;
  border-radius: 50px;
  padding: 10px 1.7rem;
  color: var(--c-light_gray);
  text-transform: uppercase;
  background-color: var(--c-primary);
  text-shadow: -1px -1px 0 rgba(0, 0, 0, 0.5);
  border-left: 1px solid rgba(255, 255, 255, 0.35);
  border-bottom: 1px solid rgba(255, 255, 255, 0.35);
  border-right: 1px solid rgba(255, 255, 255, 0.35);
  background-image: -webkit-linear-gradient(
      top,
      rgba(0, 0, 0, 0),
      rgba(0, 0, 0, 0.35)
    ),
    url(/images/bg02.webp);
  box-shadow: inset 0px 0px 0px 1px rgba(0, 0, 0, 0.35),
    inset 0px 2px 1px 0px rgba(255, 255, 255, 0.35);
  transition: 0.3s;
  white-space: nowrap;
  cursor: pointer;
}

.contact-btn:hover {
  color: var(--c-white);
  background-color: var(--c-lightblue);
}

/*---------- RESPONSIVE MENU ----------*/

.menu_responsive_box {
  width: 90%;
  position: absolute;
  top: 90%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--header-gradient);
  overflow: hidden;
  height: 0;
  transition: height 0.35s ease;
  border-bottom-left-radius: 42px;
  border-bottom-right-radius: 42px;
  box-shadow: var(--shadow-2);
  border: none;
  z-index: 50;
}

.menu_responsive_box .menu {
  flex-direction: column;
  padding: 1rem 2rem;
}

.menu_responsive_box .menu li {
  margin: 12px 0;
  text-align: center;
}

.menu_responsive_box .contact-btn {
  width: fit-content;
  display: block;
  margin: 1rem auto 2rem auto;
  padding: 12px 30px;
}

.check-icon:checked ~ .menu_responsive_box {
  height: 240px;
}

/*------ BURGER MENU --------*/

.icon-menu {
  width: 20px;
  height: 40px;
  --gap: 5px;
  --height-bar: 2.5px;
  --pos-y-bar-one: 0;
  --pos-y-bar-three: 0;
  --scale-bar: 1;
  --rotate-bar-one: 0;
  --rotate-bar-three: 0;
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: relative;
  gap: var(--gap);
}

.bar {
  position: relative;
  width: 100%;
  height: var(--height-bar);
  background-color: var(--c-secondary);
}

.bar--1 {
  top: var(--pos-y-bar-one);
  transform: rotate(var(--rotate-bar-one));
  transition: top 100ms 100ms, transform 50ms;
}

.bar--2 {
  transform: scaleX(var(--scale-bar));
  transition: transform 75ms 100ms;
}

.bar--3 {
  bottom: var(--pos-y-bar-three);
  transform: rotate(var(--rotate-bar-three));
  transition: bottom 100ms 100ms, transform 50ms;
}

.check-icon:checked + .icon-menu > .bar--1 {
  transition: top 100ms, transform 100ms 50ms;
}

.check-icon:checked + .icon-menu > .bar--3 {
  transition: bottom 100ms, transform 100ms 50ms;
}

.check-icon:checked + .icon-menu {
  --pos-y-bar-one: calc(var(--gap) + var(--height-bar));
  --pos-y-bar-three: calc(var(--gap) + var(--height-bar));
  --scale-bar: 0;
  --rotate-bar-one: 45deg;
  --rotate-bar-three: -45deg;
}

@media (max-width: 1020px) {
  .header_div {
    width: 100%;
  }
}

@media (max-width: 960px) {
  .menu_wrap {
    display: none;
  }

  .icon-menu {
    display: flex;
  }
}

@media (min-width: 961px) {
  .menu_responsive_box {
    display: none;
  }
}

@media (max-width: 490px) {
  header {
    padding: 15px 25px;
  }
}

@media (max-width: 380px) {
  .logo {
    font-size: 1.2rem;
  }

  .contact-btn {
    padding: 0.4rem 1.5rem;
    font-size: 0.9rem;
  }
}