:root {
  --blue-deep: #0a192f;
  --blue-base: #112240;
  --aquamarine: #64ffda;
  --gray-light: #ccd6f6;
  --gray-deep: #8892b0;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  background-color: var(--blue-deep);
  color: var(--gray-light);
}

section {
  min-height: 100vh;
  min-height: 100dvh;
}

header {
  position: relative;
}

header.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: var(--blue-deep);
  border-bottom: 1px solid var(--gray-deep);
  z-index: 10;
}

header .container {
  max-width: 1200px;
  margin: 0 auto; 
  padding: 1.25rem;
  display: flex;
  justify-content: space-between; 
  align-items: center; 
}

.logo {
  font-weight: bold;
  font-size: 1.5rem;
  color: var(--aquamarine);
}

/* Desktop menu */
.nav-links {
  display: flex;
  align-items: center; 
}

.menu-btn {
  display: none;
}

.nav-links a {
  margin-right: 1rem;
  text-decoration: none;
  color: var(--gray-light);
  font-size: 0.875rem;
  transition: color 0.3s; 
}

.nav-links a:hover {
  color: var(--aquamarine);
}

.btn {
  color: var(--aquamarine);
  border: 1px solid var(--aquamarine);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  text-decoration: none;
}

/* Hamburger button */
.menu-btn {
  background: none;
  border: none;
  color: var(--aquamarine);
  cursor: pointer;
}

.menu-btn svg {
  width: 24px;
  height: 24px;
}

/* Mobile menu */
.mobile-menu {
  position: absolute; 
  top: -500%;
  left: 0;
  right: 0;
  background: var(--blue-base);
  box-shadow: 0 4px 8px rgba(0,0,0,0.3);
  border-radius: 0 0 8px 8px; 
  padding: 1.5rem;
  z-index: 10; 
  display: none; 
}

.mobile-menu a {
  display: block;
  margin: 1rem 0;
  text-decoration: none;
  color: var(--gray-light);
  transition: color 0.3s;
}

.mobile-menu a span {
  color: var(--aquamarine);
  margin-right: 0.5rem;
}

.mobile-menu a:hover {
  color: var(--aquamarine);
}

#menuClose {
  background: none;
  border: none;
  color: var(--aquamarine);
  float: right;
  cursor: pointer;
}

#menuClose svg {
  width: 24px;
  height: 24px;
}

#overlay{
  background: rgba(0, 0, 0, 0.5);
  position: fixed;
  inset: 0;
  z-index: 9;
  display: none;
}

.pg {
  padding-top: 5rem;
}

.pg:nth-child(2n+1) {
  background-color: yellow;
}

.pg:nth-child(2n) {
  background-color: red;
}

/* Responsive rules */
@media (max-width: 1000px) {
  .nav-links {
    display: none;
  }

  .menu-btn {
    display: block;
  }

  .mobile-menu {
    display: block;
    transition: top .5s ease-in-out;
  }

  .mobile-menu.show {
    top: 0;
  }

  .mobile-menu.show ~ #overlay{
    display: block;
  }
}