* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #111827 100%);
  color: #f1f5f9;
  line-height: 1.6;
}

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 60px 24px;
}

h1 {
  margin: 0 0 12px 0;
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  background: linear-gradient(135deg, #06b6d4, #3b82f6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
}

.intro {
  margin-bottom: 40px;
  font-size: 1.1rem;
  color: #cbd5e1;
  line-height: 1.8;
}

section {
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.5), rgba(15, 23, 42, 0.5));
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 16px;
  padding: 32px;
  margin-bottom: 24px;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}

section:hover {
  border-color: rgba(148, 163, 184, 0.3);
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.7), rgba(15, 23, 42, 0.7));
}

h2 {
  margin: 0 0 16px 0;
  font-size: 1.5rem;
  color: #f1f5f9;
  font-weight: 600;
}

h3 {
  margin: 20px 0 10px 0;
  font-size: 1.1rem;
  color: #cbd5e1;
  font-weight: 600;
}

p {
  margin: 0 0 12px 0;
  color: #cbd5e1;
}

ul {
  margin: 0;
  padding-left: 20px;
}

li {
  margin: 8px 0;
  color: #cbd5e1;
}

a {
  color: #06b6d4;
  text-decoration: none;
  font-weight: 500;
  transition: all 0.2s ease;
  border-bottom: 2px solid transparent;
}

a:hover {
  color: #3b82f6;
  border-bottom-color: #3b82f6;
}

footer {
  margin-top: 60px;
  padding-top: 32px;
  border-top: 1px solid rgba(148, 163, 184, 0.1);
  color: #94a3b8;
  text-align: center;
  font-size: 0.95rem;
}

@media (max-width: 640px) {
  main {
    padding: 40px 16px;
  }
  
  section {
    padding: 24px;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.3rem;
  }
}