:root {
  --primary-color: #4567b7;
  --secondary-color: #8c564b;
  --accent-orange: #ff9800;
  --accent-green: #4caf50;
  --bg-gradient: linear-gradient(135deg, #f5f5f5 0%, #ffffff 100%);
  --text-dark: #333;
  --text-light: #f8f9fa;
  --shadow-sm: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-md: 0 8px 15px rgba(0,0,0,0.15);
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

body {
  background: var(--bg-gradient);
  font-family: 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  color: var(--text-dark);
  line-height: 1.6;
  margin: 0;
  padding: 0;
  min-height: 100%;
}

.header-banner {
  background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
  color: white;
  padding: 2rem 0;
  text-align: center;
  position: relative;
  overflow: hidden;
  margin-bottom: 3rem;
}

.header-banner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-orange), var(--accent-green));
  animation: rainbow 8s linear infinite;
}

@keyframes rainbow {
  0% { background-position: 0% 50%; }
  100% { background-position: 100% 50%; }
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.card {
  background: white;
  border-radius: 12px;
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.card::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

.img-container {
  display: flex;
  justify-content: center;
  margin: 2rem 0;
  flex-wrap: wrap;
  gap: 1rem;
}

.decor-img {
  width: 150px;
  height: 150px;
  object-fit: cover;
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.decor-img:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
}

article {
  background: white;
  padding: 3rem;
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  margin: 3rem 0;
}

h2 {
  color: var(--primary-color);
  font-size: 2rem;
  margin-top: 3rem;
  position: relative;
  padding-bottom: 0.5rem;
}

h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

h3 {
  color: var(--secondary-color);
  font-size: 1.5rem;
  margin-top: 2rem;
}

pre {
  background: #f8f9fa;
  padding: 1.5rem;
  border-radius: 8px;
  overflow-x: auto;
  border-left: 4px solid var(--primary-color);
  font-family: 'Courier New', monospace;
  margin: 1.5rem 0;
}

code {
  font-family: 'Courier New', monospace;
  color: var(--primary-color);
}

.note {
  background: rgba(69, 103, 183, 0.1);
  padding: 1rem;
  border-left: 4px solid var(--primary-color);
  margin: 2rem 0;
  border-radius: 0 4px 4px 0;
}

.footer {
  text-align: center;
  padding: 2rem;
  margin-top: 4rem;
  color: var(--text-dark);
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }
  
  article {
    padding: 2rem 1rem;
  }
  
  .tech-grid {
    grid-template-columns: 1fr;
  }
}

/* Interactive elements */
.interactive-demo {
  background: linear-gradient(135deg, #f8f9fa 0%, white 100%);
  padding: 2rem;
  border-radius: 12px;
  margin: 2rem 0;
  border: 1px solid rgba(0,0,0,0.1);
}

.demo-button {
  background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
  color: white;
  border: none;
  padding: 0.8rem 1.5rem;
  border-radius: 6px;
  font-weight: bold;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
  margin: 1rem 0;
}

.demo-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Navigation */
.page-nav {
  position: sticky;
  top: 0;
  background: white;
  z-index: 100;
  box-shadow: var(--shadow-sm);
  margin-bottom: 2rem;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
}

.nav-link {
  color: var(--text-dark);
  text-decoration: none;
  font-weight: 500;
  position: relative;
  padding: 0.5rem 0;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: width 0.3s ease;
}

.nav-link:hover::after {
  width: 100%;
}

@media (max-width: 768px) {
  .nav-container {
    flex-direction: column;
    padding: 1rem;
  }
  
  .nav-links {
    margin-top: 1rem;
    flex-wrap: wrap;
    justify-content: center;
  }
}