*{box-sizing:border-box;margin:0;padding:0}
html,body{width:100%;height:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;background:#fff;color:#111;line-height:1.4}
.container{max-width:480px;margin:auto;padding:16px}
h1{font-size:24px;margin-bottom:12px}
h2{font-size:18px;margin-bottom:8px}
p{font-size:15px;margin-bottom:10px}
a{text-decoration:none;color:inherit}
button,.btn{width:100%;padding:14px;font-size:16px;border:0;border-radius:8px;background:#1877f2;color:#fff;font-weight:600}
input,select,textarea{width:100%;padding:12px;border:1px solid #ccc;border-radius:6px;font-size:15px}
.hidden{display:none}