*{box-sizing:border-box}
body{margin:0;font:18px/1.4 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:#000;background:#fff;min-height:100vh;display:flex;flex-direction:column}
main{flex:1;padding:12px 20px;max-width:480px;width:100%;margin:0 auto}
.mark{font-weight:700;font-size:20px}
h1{font-size:28px;line-height:1.2;margin:32px 0 12px}
h2{font-size:24px;line-height:1.2;margin:16px 0}
p{margin:0 0 16px}
.btn,button,input{font:inherit;color:#000;background:#fff;border:2px solid #000;border-radius:0;padding:10px;width:100%;display:block;margin:0 0 8px;text-align:center;text-decoration:none}
button{cursor:pointer}
button:disabled{opacity:.4;cursor:not-allowed}
.back{width:auto;border:0;padding:6px 0;margin:0;text-decoration:underline}
.top{display:flex;justify-content:space-between;align-items:center;height:32px}
footer{padding:16px 20px;font-size:14px}
[hidden]{display:none!important}