:root{--ink:#141414;--paper:#f5f2ec;--orange:#ff5a1f;--line:#ded9d0}*{box-sizing:border-box}body{margin:0;min-height:100vh;display:grid;place-items:center;background:radial-gradient(circle at 50% 35%,#fff 0,transparent 46%),var(--paper);color:var(--ink);font:15px/1.6 Inter,"PingFang SC","Microsoft YaHei",sans-serif}main{width:min(430px,calc(100vw - 32px));background:#fff;border:1px solid var(--line);border-radius:18px;padding:42px;box-shadow:0 24px 70px #2b21150d;text-align:center}.mark{margin:auto;width:48px;height:48px;border-radius:12px;background:var(--ink);color:#fff;display:grid;place-items:center;font:italic 700 25px Georgia}span{display:block;margin-top:25px;color:var(--orange);font:700 10px monospace;letter-spacing:.22em}h1{font:700 34px Georgia,"Songti SC",serif;margin:8px 0 4px}p{margin:0 0 25px;color:#777}input,button{width:100%;height:52px;border-radius:9px;font:inherit}input{border:1px solid var(--line);padding:0 15px;outline:none}input:focus{border-color:var(--orange);box-shadow:0 0 0 3px #ff5a1f14}button{margin-top:11px;border:0;background:var(--ink);color:#fff;font-weight:700;cursor:pointer}button:hover{background:var(--orange)}button:disabled{opacity:.55;cursor:not-allowed}button b{margin-left:20px}#message{min-height:25px;margin-top:10px;color:#c33;font-size:13px}small{color:#aaa}.site-footer{position:fixed;left:0;right:0;bottom:20px;text-align:center;font-size:13px}.site-footer a{color:#8b847b;text-decoration:none}.site-footer a:hover{color:var(--orange);text-decoration:underline}@media(max-width:480px){main{padding:30px 22px}.site-footer{bottom:10px;font-size:12px}}