body { font-family: system-ui, -apple-system, Arial, sans-serif; max-width: 760px; margin: 0 auto; padding: 24px; line-height: 1.7; color: #222; }
header { border-bottom: 2px solid #222; margin-bottom: 24px; }
nav a { margin-right: 12px; }
h1 { font-size: 2rem; line-height: 1.3; }
h2, h3 { line-height: 1.4; }
.video-placeholder { background: #f2f2f2; border: 1px dashed #999; padding: 32px; text-align: center; margin: 24px 0; }
footer { border-top: 1px solid #ccc; margin-top: 32px; padding-top: 16px; font-size: 0.9rem; color: #555; }