/* Header styles */

header {
  /* position: fixed; */
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: transparent;
  z-index: var(--z-high);
  /* transition: background-color var(--transition-normal), box-shadow var(--transition-normal); */
}
/* 
header.scrolled {
  background-color: var(--color-white);
  box-shadow: var(--shadow-md);
} */

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
}

.logo h1 {
  font-size: 1.5rem;
  margin-bottom: 0;
  color: var(--color-primary);
  font-weight: 700;
  letter-spacing: 1px;
  transition: color var(--transition-fast);
}

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

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

.nav-links li {
  margin-left: var(--space-4);
}

.nav-links a {
  color: var(--color-gray-800);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-links a:after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  height: 3px;
  width: 0;
  background-color: var(--color-primary);
  transition: width var(--transition-normal);
  border-radius: var(--radius-full);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-primary);
}

.nav-links a:hover:after,
.nav-links a.active:after {
  width: 100%;
}

/* Theme toggle */
.theme-toggle {
  margin-left: var(--space-4);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background-color: var(--color-gray-100);
  transition: background-color var(--transition-fast);
}

.theme-toggle:hover {
  background-color: var(--color-gray-200);
}

/* Mobile menu */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 20px;
  cursor: pointer;
  margin-left: var(--space-3);
}

.mobile-menu-btn span {
  height: 2px;
  width: 100%;
  background-color: var(--color-gray-800);
  border-radius: var(--radius-full);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.mobile-menu-btn.active span:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}

.mobile-menu-btn.active span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}

/* Mobile responsive */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: calc(100vh - var(--header-height));
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding-top: var(--space-5);
    background-color: var(--color-white);
    transform: translateX(100%);
    transition: transform var(--transition-normal);
    z-index: var(--z-mid);
  }
  
  .nav-links.active {
    transform: translateX(0);
  }
  
  .nav-links li {
    margin: var(--space-3) 0;
  }
  
  .nav-links a {
    font-size: 1.2rem;
  }
  
  .mobile-menu-btn {
    display: flex;
  }
}