:root{--accent:#0a5}*{box-sizing:border-box}body{font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Arial,Noto Sans,Apple Color Emoji,Segoe UI Emoji}button,input,select,textarea{border:1px solid #ddd;border-radius:8px;padding:10px;width:100%}button{background:var(--accent);color:#fff;font-weight:600;cursor:pointer}button:disabled{opacity:.6;cursor:not-allowed}label{display:block;font-weight:600;margin-top:12px}.container{background:#fff;border:1px solid #eee;border-radius:16px;padding:24px;box-shadow:0 6px 20px rgba(0,0,0,.04)}.h1{font-size:2rem;font-weight:800;margin-bottom:8px}.h2{font-size:1.25rem;font-weight:700;margin:24px 0 8px}.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,Courier New,monospace}