/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif; line-height: 1.6; color: #333; background: #f9f9f9; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* Header */
header { background: #1a73e8; color: #fff; padding: 1rem 0; box-shadow: 0 2px 10px rgba(0,0,0,0.1); }
header .container { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; }
.logo { font-size: 1.5rem; font-weight: bold; color: #fff; text-decoration: none; }
nav ul { list-style: none; display: flex; gap: 1.5rem; }
nav a { color: #fff; text-decoration: none; font-weight: 500; padding: 0.5rem 0; transition: opacity 0.2s; }
nav a:hover, nav a.active { opacity: 0.8; border-bottom: 2px solid #fff; }

/* Main content */
main { padding: 2rem 0; }
article { background: #fff; padding: 2rem; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.1); }
h1 { font-size: 2.5rem; margin-bottom: 1rem; color: #1a73e8; }
h2 { font-size: 1.8rem; margin: 2rem 0 1rem; color: #444; }
h3 { font-size: 1.4rem; margin-bottom: 0.5rem; }
.intro { font-size: 1.1rem; margin-bottom: 2rem; color: #555; }
.content { margin-bottom: 1.5rem; }

/* FAQ */
.faq { margin-top: 2rem; border-top: 1px solid #eee; padding-top: 2rem; }
.faq-item { margin-bottom: 1.5rem; }
.faq-item h3 { color: #1a73e8; cursor: pointer; }

/* Footer */
footer { text-align: center; padding: 2rem 0; color: #777; font-size: 0.9rem; border-top: 1px solid #eee; margin-top: 2rem; }

/* Responsive */
@media (max-width: 768px) {
  header .container { flex-direction: column; align-items: flex-start; }
  nav ul { flex-direction: column; gap: 0.5rem; margin-top: 1rem; }
  h1 { font-size: 2rem; }
}