:root{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;color-scheme:light dark;background:#0d0d10;color:#eee}*{box-sizing:border-box}body{margin:0;min-height:100vh}button{cursor:pointer;font:inherit}a{color:#6cf}.app-shell{display:grid;grid-template-rows:auto 1fr;min-height:100vh}.topbar{display:flex;justify-content:space-between;align-items:center;padding:12px 24px;background:#16161c;border-bottom:1px solid #2a2a32}.topbar nav{display:flex;gap:16px}.topbar nav a{text-decoration:none;color:#ccc}.topbar nav a.active{color:#fff;font-weight:600}main{padding:24px}.card{background:#16161c;border:1px solid #2a2a32;border-radius:12px;padding:20px;margin-bottom:16px}input,select,textarea{background:#0d0d10;border:1px solid #2a2a32;border-radius:8px;color:#eee;padding:8px 12px;font:inherit}button.primary{background:#4a7eff;border:none;color:#fff;padding:10px 20px;border-radius:8px;font-weight:600}button.primary:hover{background:#5a8eff}