* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; color: #1a1a2e; background: #fff; line-height: 1.7; }
a { color: #4f46e5; text-decoration: none; }
a:hover { text-decoration: underline; }
nav { display: flex; align-items: center; justify-content: space-between; padding: 1.2rem 2rem; border-bottom: 1px solid #e5e7eb; }
nav .logo { font-weight: 700; font-size: 1.2rem; color: #1a1a2e; }
nav .logo span { color: #4f46e5; }
nav ul { list-style: none; display: flex; gap: 2rem; }
nav ul a { color: #6b7280; font-size: 0.95rem; }
.container { max-width: 860px; margin: 0 auto; padding: 3rem 2rem; }
h1 { font-size: 2rem; font-weight: 700; margin-bottom: 0.5rem; }
.subtitle { color: #6b7280; margin-bottom: 2.5rem; font-size: 1rem; }
h2 { font-size: 1.2rem; font-weight: 600; margin: 2rem 0 0.75rem; }
p { margin-bottom: 1rem; color: #374151; }
ul, ol { padding-left: 1.5rem; margin-bottom: 1rem; color: #374151; }
li { margin-bottom: 0.4rem; }
footer { text-align: center; padding: 2rem; border-top: 1px solid #e5e7eb; color: #9ca3af; font-size: 0.85rem; margin-top: 4rem; }
footer a { color: #9ca3af; }