*{box-sizing:border-box}body{margin:0;font-family:-apple-system,'PingFang SC','Microsoft YaHei',sans-serif;background:#f5f7fa;color:#1f2733}
header{background:#fff;border-bottom:1px solid #e6e9ef;padding:12px 20px;display:flex;align-items:center;gap:12px}
header .brand{font-weight:700;color:#2563eb}
header a.back{margin-left:auto;font-size:13px;color:#2563eb;text-decoration:none;border:1px solid #d0d5dd;border-radius:8px;padding:6px 12px}
main{max-width:880px;margin:24px auto;padding:0 20px}
h1{font-size:24px;margin:0 0 8px}
.lead{color:#475467;line-height:1.7;margin:0 0 24px}
.card{background:#fff;border:1px solid #e6e9ef;border-radius:12px;padding:20px;margin-bottom:20px}
form label{display:block;font-size:13px;color:#475467;margin:12px 0 4px}
input,textarea{width:100%;padding:10px 12px;border:1px solid #d0d5dd;border-radius:8px;font-size:14px}
button{margin-top:16px;background:#2563eb;color:#fff;border:0;border-radius:8px;padding:10px 20px;font-size:14px;cursor:pointer}
button:active{transform:translateY(1px)}
#msg{margin-top:12px;font-size:14px;color:#1a7f43}
footer{text-align:center;color:#9aa3af;font-size:12px;padding:24px}
.tips{font-size:12px;color:#9aa3af;margin-top:8px}