:root { --max: 980px; } 

* { box-sizing: border-box; }

body { 
  margin: 0; 
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Helvetica Neue, Arial, sans-serif; 
  line-height: 1.6; 
}

a { 
  text-decoration: none; 
  color: inherit; 
}

.header { 
  max-width: var(--max); 
  margin: 2rem auto 1rem; 
  padding: 0 1rem; 
}

.title { 
  margin: 0; 
  font-size: 2.5rem;
  font-weight: 700;
}

.subtitle { 
  color: #555; 
  margin-top: .35rem; 
  font-size: 1.1rem;
}

.nav { 
  max-width: var(--max); 
  margin: 0 auto 1rem; 
  padding: 0 1rem; 
  display: flex; 
  gap: 1rem; 
}

.nav a {
  padding: 0.5rem 1rem;
  border-radius: 6px;
  transition: background-color 0.2s ease;
}

.nav a:hover {
  background-color: rgba(0, 0, 0, 0.05);
}

.main { 
  max-width: var(--max); 
  margin: 1rem auto 3rem; 
  padding: 0 1rem; 
}

.main p {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  padding: 1rem;
  background-color: #f9fafb;
  border-radius: 8px;
  border-left: 4px solid #3b82f6;
}

.main a {
  color: #3b82f6;
  text-decoration: underline;
  font-weight: 500;
}

.main a:hover {
  color: #2563eb;
}

.footer { 
  border-top: 1px solid #eee; 
  padding: 1rem; 
  text-align: center; 
  color: #666; 
  margin-top: 3rem;
}

/* Mobile Optimization */
@media (max-width: 768px) {
  .header {
    margin: 1.5rem auto 1rem;
    padding: 0 1rem;
  }
  
  .title {
    font-size: 2rem;
    line-height: 1.2;
  }
  
  .subtitle {
    font-size: 1rem;
    line-height: 1.5;
  }
  
  .nav {
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.5rem;
    padding: 0 1rem;
  }
  
  .nav a {
    padding: 0.6rem 1.2rem;
    font-size: 0.95rem;
  }
  
  .main {
    padding: 0 1rem;
  }
  
  .main p {
    font-size: 1rem;
    padding: 0.8rem;
  }
}

@media (max-width: 480px) {
  .header {
    padding: 0 0.75rem;
    margin: 1rem auto 0.75rem;
  }
  
  .title {
    font-size: 1.8rem;
  }
  
  .subtitle {
    font-size: 0.9rem;
  }
  
  .nav {
    flex-direction: column;
    align-items: center;
    gap: 0.3rem;
    padding: 0 0.75rem;
  }
  
  .nav a {
    width: 100%;
    text-align: center;
    padding: 0.7rem 1rem;
    font-size: 0.9rem;
  }
  
  .main {
    padding: 0 0.75rem;
  }
  
  .main p {
    font-size: 0.95rem;
    padding: 0.7rem;
  }
  
  .footer {
    padding: 1rem 0.75rem;
    font-size: 0.9rem;
  }
}

@media (max-width: 360px) {
  .title {
    font-size: 1.6rem;
  }
  
  .main p {
    font-size: 0.9rem;
    padding: 0.6rem;
  }
}

@media (prefers-color-scheme: dark) {
  body { background: #0b0b0c; color: #e7e7e9; }
  .footer { border-color: #2a2a2e; color: #a0a0a6; }
  .subtitle { color: #a0a0a6; }
  .main p {
    background-color: #1f2937;
    border-left-color: #60a5fa;
  }
  .main a {
    color: #60a5fa;
  }
  .main a:hover {
    color: #93c5fd;
  }
  .nav a:hover {
    background-color: rgba(255, 255, 255, 0.05);
  }
}