:root{color-scheme:light;font-family:"Microsoft YaHei",sans-serif;color:#5a443e;background:#fcf5ec}*{box-sizing:border-box}body{margin:0;min-height:100svh;display:grid;place-items:center;padding:26px;background:radial-gradient(ellipse at 10% 10%,#eedbcf88,transparent 55%),radial-gradient(ellipse at 90% 90%,#dbe0cc88,transparent 55%)}.letter{width:min(100%,480px);text-align:center;padding:46px 40px 32px;border:1px solid #e1d1c0;border-radius:8px 8px 96px 8px;background:#fffdf7;box-shadow:0 24px 80px #704c3010}.mark{font-family:serif;font-size:52px;color:#b57968}.eyebrow{font-size:10px;letter-spacing:3px;color:#a38775;margin:18px 0 24px}h1{font-family:"Noto Serif SC","Songti SC",SimSun,serif;font-weight:500;font-size:34px;line-height:1.7;margin:0}.intro{font-size:13px;color:#947f71;line-height:1.9;margin:20px 0 30px}form{text-align:left}label{display:block;font-size:12px;margin-bottom:10px}input{width:100%;min-height:50px;border:1px solid #ddcdbd;background:#fffaf1;border-radius:10px;padding:12px 16px;font-size:16px;color:#59413a}input:focus{outline:2px solid #a87966;outline-offset:3px}button{margin-top:16px;width:100%;min-height:50px;border:0;border-radius:10px;background:#795d50;color:#fff9ef;font-size:14px;cursor:pointer}button span{margin-left:16px}button:disabled{opacity:.65;cursor:wait}#message{min-height:24px;line-height:1.7;font-size:12px;color:#a44d45;margin:12px 0}.footer{font-size:11px;letter-spacing:2px;color:#ac9786;margin:22px 0 0}@media(max-width:450px){.letter{padding:34px 25px 28px}h1{font-size:30px}}