:root{--primary-blue: #1DA1F2;--primary-green: #25D366;--background-light: #FAFAFA;--text-dark: #333;--text-light: #FFFFFF;--border-color: #E0E0E0}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:var(--background-light);color:var(--text-dark);display:flex;justify-content:center;align-items:center;min-height:100vh}button{cursor:pointer;border:none;padding:10px 20px;border-radius:20px;font-weight:700;color:var(--text-light);background-color:var(--primary-blue);transition:background-color .3s ease}button:hover{opacity:.9}.container{background:#fff;padding:40px;border-radius:16px;box-shadow:0 4px 20px #0000001a;text-align:center;max-width:400px;width:100%}input{width:calc(100% - 20px);padding:10px;margin-bottom:15px;border-radius:8px;border:1px solid var(--border-color)}