:root {
  --primary: #007BFF;
  --secondary: #6C63FF;
  --background: #f9f9fb;
  --text: #333;
  --nav-bg: linear-gradient(90deg, #6C63FF, #007BFF);
  --footer-bg: #f0f0f0;
  --hover-bg: #0056d2;
}

* {
  box-sizing: border-box;
}

html, body {
  height: 100%;
  margin: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: var(--background);
  color: var(--text);
  scroll-behavior: smooth;
}

body {
  display: flex;
  flex-direction: column;
}

header {
  background: var(--nav-bg);
  color: white;
  padding: 1.5rem 1rem;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  position: relative;
  z-index: 1;
  animation: glow 3s ease-in-out infinite alternate;
}

@keyframes glow {
  from { box-shadow: 0 0 10px rgba(0, 123, 255, 0.4); }
  to   { box-shadow: 0 0 20px rgba(108, 99, 255, 0.6); }
}

header h1 {
  margin: 0;
  font-size: 2.5rem;
  letter-spacing: 1.2px;
}

nav {
  margin-top: 1rem;
}

nav a {
  display: inline-block;
  padding: 10px 20px;
  margin: 0 10px;
  border-radius: 30px;
  background: rgba(255, 255, 255, 0.1);
  color: white;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s ease;
}

nav a:hover {
  background: white;
  color: var(--secondary);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  text-decoration: none;
}

main {
  flex: 1;
  max-width: 960px;
  margin: 2rem auto;
  padding: 2rem;
  background: white;
  border-radius: 16px;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.07);
  animation: fadeIn 0.7s ease-in;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

main h2 {
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: 1rem;
  position: relative;
}

main h2::after {
  content: "";
  width: 50px;
  height: 4px;
  background: var(--secondary);
  display: block;
  margin-top: 8px;
  border-radius: 2px;
}

main ul {
  list-style: none;
  padding-left: 0;
}

main ul li {
  background: #f0f5ff;
  margin-bottom: 1rem;
  padding: 1.2rem;
  border-left: 5px solid var(--primary);
  border-radius: 12px;
  font-weight: 500;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

main ul li:hover {
  transform: translateY(-3px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

main p {
  line-height: 1.8;
  font-size: 1.1rem;
  margin-top: 1.5rem;
}

footer {
  text-align: center;
  padding: 1.5rem;
  background: var(--footer-bg);
  font-size: 0.9rem;
  color: #666;
  border-top: 1px solid #ddd;
  margin-top: auto;
  box-shadow: 0 -2px 6px rgba(0, 0, 0, 0.05);
  animation: fadeIn 1s ease-in;
}

@media (max-width: 768px) {
  header h1 {
    font-size: 1.6rem;
  }

  nav a {
    margin: 8px 6px;
    padding: 8px 16px;
  }

  main {
    margin: 1rem;
    padding: 1.5rem;
  }

  main h2 {
    font-size: 1.5rem;
  }
}