/* 1. Global Resets & Variables */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #2563eb;
  --text-color: #1f2937;
  --bg-color: #ffffff;
  --hover-bg: #f3f4f6;
  --transition: all 0.3s ease;
}

body {
  font-family: system-ui, -apple-system, sans-serif;
  background-color: #f9fafb;
}

/* 2. Navbar Layout */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background-color: var(--bg-color);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 100;
}

/* 3. Logo Styles */
.nav-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
}

/* 4. Desktop Menu Items */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-link {
  text-decoration: none;
  color: var(--text-color);
  font-weight: 500;
  font-size: 1rem;
  padding: 0.5rem 1rem;
  border-radius: 0.375rem;
  transition: var(--transition);
}

.nav-link:hover, 
.nav-link.active {
  color: var(--primary-color);
  background-color: var(--hover-bg);
}

/* 5. Mobile Layout (Hidden Elements by Default) */
.nav-toggle {
  display: none;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background-color: var(--text-color);
  border-radius: 2px;
  transition: var(--transition);
}

/* 6. Responsive Media Query */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    flex-direction: column;
    background-color: var(--bg-color);
    padding: 1.5rem;
    gap: 1rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    
    /* Hide off-screen by default */
    transform: translateY(-150%);
    opacity: 0;
    transition: var(--transition);
    pointer-events: none;
  }

  /* Target open state using checkbox selector */
  .nav-toggle:checked ~ .nav-menu {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  /* Hamburger Animate to 'X' when active */
  .nav-toggle:checked ~ .hamburger span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  .nav-toggle:checked ~ .hamburger span:nth-child(2) {
    opacity: 0;
  }
  .nav-toggle:checked ~ .hamburger span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }
}