* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #1a365d;
  --secondary-color: #2d4a7c;
  --accent-color: #4a90d9;
  --text-color: #2d3748;
  --text-light: #718096;
  --background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --card-bg: rgba(255, 255, 255, 0.95);
  --border-radius: 16px;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    sans-serif;
  background: var(--background);
  min-height: 100vh;
  color: var(--text-color);
  line-height: 1.7;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 20px;
}

header {
  text-align: center;
  margin-bottom: 40px;
  padding: 40px;
  background: var(--card-bg);
  border-radius: var(--border-radius);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
  backdrop-filter: blur(10px);
}

header h1 {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 10px;
  background: linear-gradient(135deg, #667eea, #764ba2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.app-name {
  font-size: 1.2rem;
  color: var(--text-light);
  font-weight: 500;
}

main {
  background: var(--card-bg);
  border-radius: var(--border-radius);
  padding: 40px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
  backdrop-filter: blur(10px);
}

section {
  margin-bottom: 30px;
  padding-bottom: 25px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

section:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

h2 {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--secondary-color);
  margin-bottom: 15px;
  position: relative;
  padding-left: 15px;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 100%;
  background: linear-gradient(135deg, #667eea, #764ba2);
  border-radius: 2px;
}

p {
  margin-bottom: 15px;
  color: var(--text-color);
}

p:last-child {
  margin-bottom: 0;
}

.intro {
  font-size: 1.1rem;
  color: var(--text-light);
  font-weight: 500;
}

ul {
  margin: 15px 0;
  padding-left: 25px;
}

li {
  margin-bottom: 10px;
  position: relative;
}

li::marker {
  color: var(--accent-color);
}

footer {
  text-align: center;
  margin-top: 40px;
  padding: 30px;
  background: var(--card-bg);
  border-radius: var(--border-radius);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

footer p {
  color: var(--text-light);
  font-size: 0.9rem;
  margin: 0;
}

/* Animations */
header,
main,
footer {
  animation: fadeInUp 0.6s ease-out forwards;
}

main {
  animation-delay: 0.1s;
}

footer {
  animation-delay: 0.2s;
}

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

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 20px 15px;
  }

  header {
    padding: 30px 20px;
  }

  header h1 {
    font-size: 1.8rem;
  }

  main {
    padding: 25px 20px;
  }

  h2 {
    font-size: 1.2rem;
  }
}

/* Hover effects */
section {
  transition: transform 0.3s ease;
}

section:hover {
  transform: translateX(5px);
}