:root{color-scheme:dark}*,*:before,*:after{box-sizing:border-box}body{margin:0;background:#0d1117}.app{max-width:1200px;margin:0 auto;padding:1rem 2rem;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;color:#e0e0e0;background:#0d1117;min-height:100vh}.app-header{text-align:center;margin-bottom:2rem;padding:1.5rem 0;border-bottom:1px solid #21262d}.app-header h1{margin:0;font-size:2rem;color:#58a6ff}.subtitle{color:#8b949e;margin:.25rem 0 0}.nav-bar{display:flex;gap:.5rem;margin-bottom:2rem;justify-content:center}.nav-bar button{padding:.6rem 1.2rem;border:1px solid #30363d;border-radius:6px;background:#161b22;color:#c9d1d9;cursor:pointer;font-size:.9rem;transition:all .15s ease}.nav-bar button:hover{background:#21262d;border-color:#58a6ff}.nav-bar button.active{background:#1f6feb;border-color:#1f6feb;color:#fff}.main-content{min-height:400px}.view-section{background:#161b22;border:1px solid #21262d;border-radius:8px;padding:2rem}.view-section h2{margin-top:0;color:#58a6ff}.placeholder{color:#8b949e;line-height:1.6}.app-footer{text-align:center;padding:2rem 0 1rem;color:#484f58;font-size:.8rem;border-top:1px solid #21262d;margin-top:3rem}