/* Header & Navigation Styles */
header {
  background-color: white;
  box-shadow: var(--box-shadow);
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
  padding: 15px 0;
  transition: var(--transition);
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo h1 {
  font-size: 1.8rem;
  color: var(--primary-color);
}

nav {
  display: flex;
  align-items: center;
}

.nav-menu {
  display: flex;
}

.nav-menu li {
  margin-left: 30px;
}

.nav-menu a {
  font-weight: 500;
  position: relative;
}

.nav-menu a::after {
  content: "";
  position: absolute;
  width: 0;
  height: 2px;
  background-color: var(--secondary-color);
  bottom: -5px;
  left: 0;
  transition: var(--transition);
}

.nav-menu a:hover::after {
  width: 100%;
}

.menu-toggle {
  flex-direction: column;
  cursor: pointer;
}

.menu-toggle span {
  width: 25px;
  height: 3px;
  background-color: var(--primary-color);
  margin: 2px 0;
  transition: var(--transition);
}

/* Sticky header effect */
header.sticky {
  padding: 10px 0;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}