*,
body {
  margin: 0;
  box-sizing: border-box;
  font-family: Open Sans;
}

:root {
  --primary_color: #243c72;
  --dark_blue: #021b51;
  --yellow: #ffc057;

  --container_width: 100%;
  --container_padding: 15px;
  --container_left_space: calc((100% - var(--container_width)) / 2);
}

@media (min-width: 768px) and (max-width: 991px) {
  :root {
    --container_width: 760px;
  }
}
@media (min-width: 992px) and (max-width: 1199px) {
  :root {
    --container_width: 1000px;
  }
}
@media (min-width: 1200px) {
  :root {
    --container_width: 1190px;
  }
}
@media (min-width: 1400px) {
  :root {
    --container_width: 1190px;
  }
}

.d_flex {
  display: flex;
}
.dark_bg {
  background-color: var(--dark_blue);
}
.dark_bg * {
  color: #fff;
}

header .container {
  max-width: calc(var(--container_width) + 80px);
  padding: 18px 15px;
}
.header_flex {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}
.header_flex .social_links {
  display: flex;
  align-items: center;
  gap: 16px;
}
.social_links a {
  display: flex;
}
.social_links img {
  width: 24px;
}
.gap_26 {
  gap: 28px;
}
.header_flex .contact_links {
  display: flex;
  align-items: center;
  gap: 16px;
}
.contact_icon {
  display: flex;
  align-items: center;
  gap: 8px;
}
.contact_icon a {
  font-weight: 300;
  text-decoration: none;
  color: var(--primary_color);
}

nav .container {
  padding: 0 15px;
}
nav ul {
  padding: 0;
  list-style: none;
  display: flex;
  gap: 32px;
}
nav li {
  position: relative;
}
nav li a {
  text-decoration: none;
  font-weight: 500;
  display: inline-block;
  padding: 10px 0;
  position: relative;
  transition: 0.3s;
}
nav li a:hover {
  opacity: 0.7;
}
nav li a.active::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  height: 4px;
  width: 100%;
  background-color: var(--yellow);
}

.burger {
  display: none;
}
.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  background: rgba(0, 0, 0, 0.7);
  transition: all 0.35s ease-in-out;
}

@media (max-width: 1024px) {
  header {
    box-shadow: 0 4px 6px #0000001a;
  }
  .burger {
    display: flex;
    background-color: transparent;
    border: none;
    padding: 0;
    flex-direction: column;
    gap: 6px;
    justify-content: center;
  }
  .burger_line {
    width: 32px;
    height: 3px;
    background-color: #000;
    display: block;
    transition: 0.3s;
  }
  .burger.active .burger_line:nth-child(1) {
    transform: translateY(9px) rotate(-45deg);
  }
  .burger.active .burger_line:nth-child(2) {
    opacity: 0;
  }
  .burger.active .burger_line:nth-child(3) {
    transform: translateY(-9px) rotate(45deg);
  }
  nav {
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    width: 70vw;
    transform: translateX(-100%);
    transition: 0.3s;
    z-index: 999;
  }
  nav.active {
    transform: translateX(0);
  }
  .overlay.active {
    display: block;
    opacity: 1;
    visibility: visible;
  }
  nav ul {
    flex-direction: column;
    gap: 16px;
    padding: 12px 30px;
  }
  .contact_links,
  .social_links,
  .header_cta {
    display: none !important;
  }
}

@media (max-width: 767px) {
  .logo {
    width: 140px;
  }
}

/* button start */
.btn_one {
  display: inline-block;
  background-color: var(--primary_color);
  border: 2px solid var(--primary_color);
  color: #fff;
  padding: 8px 40px;
  text-align: center;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 500;
  transition: 0.3s;
}
.btn_one:hover {
  background-color: #fff;
  color: var(--primary_color);
}
/* button end */

/* dropdown start */
.has_sub_menu {
  position: relative;
  padding-right: 20px;
}
.has_sub_menu::after {
  content: "";
  position: absolute;
  right: 0;
  top: 3px;
  bottom: 0;
  margin: auto;
  background-image: url(https://sudip-bhowmick.github.io/images/img/dropdown.svg);
  background-size: contain;
  background-repeat: no-repeat;
  width: 12px;
  height: 12px;
}
.sub_menu {
  display: none;
  background-color: var(--dark_blue);
  position: absolute;
  left: 0;
  top: 42px;
  flex-direction: column;
  gap: 0;
  padding: 8px 20px;
  white-space: nowrap;
  border-radius: 0px 0px 8px 8px;
}
.sub_menu.show {
  display: flex;
}
@media (max-width: 1024px) {
  .sub_menu {
    position: relative;
    top: 0;
  }
}
/* dropdown end */