/* Reset and base styles */
body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen,
    Ubuntu, Cantarell, sans-serif;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: #ffffff;
  min-height: 100vh;
  line-height: 1.6;
}

/* Typography */
h1 {
  font-size: 3.5rem;
  margin: 0 0 1rem 0;
  color: #ffffff;
  line-height: 1.2;
}

h2 {
  font-size: 2.5rem;
  color: #ffffff;
  margin: 0 0 1.5rem 0;
}

h3 {
  font-size: 1.75rem;
  color: #ffffff;
  margin: 0 0 1rem 0;
}

p {
  margin: 0 0 1rem 0;
}

/* Links */
a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: rgba(255, 255, 255, 1);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 600;
  transition: all 0.3s ease;
  cursor: pointer;
  text-decoration: none;
}

.btn-primary {
  background: rgba(255, 255, 255, 0.9);
  color: #1f2937;
  border: none;
}

.btn-primary:hover {
  background: rgba(255, 255, 255, 1);
  transform: translateY(-2px);
}

.btn-secondary {
  background: transparent;
  border: 2px solid rgba(255, 255, 255, 0.3);
  color: rgba(255, 255, 255, 0.8);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.5);
}

/* Cards */
.card {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 1rem;
  padding: 2rem;
  transition: all 0.3s ease;
}

.card:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 255, 255, 0.3);
  box-shadow: 0 10px 30px rgba(255, 255, 255, 0.1);
}

/* Navigation */
.nav-link {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  transition: all 0.3s ease;
}

.nav-link:hover {
  color: rgba(255, 255, 255, 1);
  background: rgba(255, 255, 255, 0.1);
}

.nav-link.active {
  color: rgba(255, 255, 255, 1);
  background: rgba(255, 255, 255, 0.2);
}

/* Grid */
.grid {
  display: grid;
  gap: 2rem;
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* Container */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem;
}

/* Responsive */
@media (max-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  h1 {
    font-size: 2.5rem;
  }
  
  h2 {
    font-size: 2rem;
  }
  
  h3 {
    font-size: 1.5rem;
  }
  
  .grid-3, .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grid-2 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
}