:root{font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;line-height:1.6;color:#213547;background-color:#fff}*{margin:0;padding:0;box-sizing:border-box}body{min-height:100vh}h1{font-size:2.5rem;font-weight:700;margin-bottom:1rem}h2{font-size:1.75rem;font-weight:600;margin-bottom:.75rem}button{padding:.75rem 1.5rem;font-size:1rem;font-weight:500;border:none;border-radius:.5rem;cursor:pointer;background-color:#4f46e5;color:#fff;transition:background-color .2s}button:hover{background-color:#4338ca}button:disabled{background-color:#9ca3af;cursor:not-allowed}input,textarea{padding:.75rem;font-size:1rem;border:1px solid #d1d5db;border-radius:.5rem;width:100%}input:focus,textarea:focus{outline:none;border-color:#4f46e5;box-shadow:0 0 0 3px #4f46e51a}.container{max-width:1200px;margin:0 auto;padding:2rem}.card{background:#fff;border-radius:.75rem;padding:1.5rem;box-shadow:0 1px 3px #0000001a;margin-bottom:1rem}@media (prefers-color-scheme: dark){:root{color:#e5e7eb;background-color:#1f2937}.card{background:#374151}input,textarea{background-color:#1f2937;border-color:#4b5563;color:#e5e7eb}}