:root{--color-primary: #00bcd4;--color-primary-dark: #0097a7;--color-background: #ffffff;--color-text: #2c3e50;--color-heading: #2c3e50;--color-border: #e2e8f0;--color-code-bg: #2e3440}@media(prefers-color-scheme:dark){:root{--color-background: #1e1e1e;--color-text: #d4d4d4;--color-heading: #ffffff;--color-border: #333333}}body{margin:0;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;background-color:var(--color-background);color:var(--color-text);line-height:1.6}.container{max-width:1200px;margin:0 auto;padding:0 2rem}h1,h2,h3{color:var(--color-heading)}.btn{display:inline-block;padding:.5rem 1.5rem;border-radius:4px;text-decoration:none;font-weight:600;transition:background .3s}.btn.primary{background-color:var(--color-primary);color:#fff}.btn.primary:hover{background-color:var(--color-primary-dark)}