body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; line-height: 1.6; margin: 0; padding: 0; background-color: #f7f9fa; color: #2d3748; }
header { background: #1a202c; color: #fff; padding: 2rem 1rem; text-align: center; }
header h1 { margin: 0; font-size: 2.5rem; }
header p { margin: 0.5rem 0 0 0; color: #cbd5e0; font-size: 1.1rem; }
nav { background: #2d3748; padding: 0.5rem; text-align: center; }
nav a { color: #fff; margin: 0 15px; text-decoration: none; font-weight: bold; }
nav a:hover { text-decoration: underline; }
.container { max-width: 900px; margin: 2rem auto; padding: 0 1rem; display: grid; grid-template-columns: 1fr; gap: 1.5rem; }
.card { background: #fff; padding: 1.5rem; border-radius: 8px; box-shadow: 0 4px 6px rgba(0,0,0,0.05); border: 1px solid #e2e8f0; }
.adsense-placeholder { background: #edf2f7; border: 2px dashed #cbd5e0; padding: 2rem; text-align: center; color: #718096; font-style: italic; font-size: 0.9rem; margin: 1rem 0; border-radius: 4px; }
footer { background: #1a202c; color: #a0aec0; text-align: center; padding: 1.5rem; font-size: 0.9rem; margin-top: 4rem; }