:root{
  --brand:#4bb745;
  --brand-dark:#3a9d3d;
  --text:#555;
  --muted:#999;
  --bg:#f6f6f6;
}
*{box-sizing:border-box}
body{
  margin:0;padding:24px 12px;background:var(--bg);color:var(--text);
  font-family:'Segoe UI',Segoe,Tahoma,Geneva,sans-serif;font-size:16px;line-height:1.6;
}
.wrap{max-width:640px;margin:0 auto}
.card{background:#fff;border:1px solid #ececec;border-radius:8px;
  box-shadow:0 4px 12px rgba(0,0,0,.06);padding:28px}
.logo{text-align:center;margin-bottom:8px}
.logo img{max-width:280px;height:auto}
.divider{border-bottom:2px solid #ccc;margin:12px 0 22px}
h1{font-size:24px;color:#444;margin:0 0 12px}
h3{font-size:17px;color:#444;margin:22px 0 8px}
.muted{color:var(--muted);font-size:14px}
.warn{background:#fff8e1;border:1px solid #ffe082;border-radius:6px;padding:12px 14px;font-size:14px}
label{display:block;font-weight:600;margin:16px 0 6px;font-size:14px}
input[type=password],input[type=text]{
  width:100%;padding:12px 14px;border:1px solid #ccc;border-radius:6px;font-size:16px}
input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(75,183,69,.2)}
.btn{display:inline-block;margin-top:18px;background:var(--brand);color:#fff;border:none;
  padding:13px 22px;border-radius:6px;font-size:16px;cursor:pointer;text-decoration:none}
.btn:hover{background:var(--brand-dark)}
.status{margin-top:16px;padding:12px 14px;border-radius:6px;background:#eef;font-size:14px}
.status.err{background:#fdecea;color:#a12; border:1px solid #f5c6cb}
.badge{display:inline-block;background:#e8f6e8;color:var(--brand-dark);border:1px solid #cfeacf;
  border-radius:999px;padding:4px 12px;font-size:13px;font-weight:600;margin:0 0 6px}
textarea{width:100%;padding:12px 14px;border:1px solid #ccc;border-radius:6px;font-size:16px;
  font-family:inherit;resize:vertical}
textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(75,183,69,.2)}
input[type=file]{width:100%;font-size:15px;padding:8px 0}
.msg{white-space:pre-wrap;word-break:break-word;background:var(--bg);border:1px solid #e2e2e2;
  border-radius:6px;padding:14px;font-family:inherit;font-size:15px;margin:0}
.confirm{background:#e8f6e8;border:1px solid #cfeacf;color:var(--brand-dark);
  border-radius:6px;padding:10px 14px;font-size:14px;margin:0 0 4px}
.sendhint{margin-top:24px;padding-top:18px;border-top:1px solid #eee;font-size:14px}
.backlink{display:inline-block;margin:18px 0 0 12px;font-size:14px;color:var(--muted);vertical-align:middle}
.backlink:hover{color:var(--text)}
.dropzone{border:2px dashed #cfd8cf;border-radius:8px;padding:22px 16px;text-align:center;
  background:#fafcfa;transition:border-color .15s,background .15s;margin:6px 0}
.dropzone.drag{border-color:var(--brand);background:#eef8ee}
.dropzone p{margin:0;color:var(--muted);font-size:14px}
.dz-link{color:var(--brand-dark);font-weight:600;cursor:pointer;text-decoration:underline}
.dz-input{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
  clip:rect(0 0 0 0);white-space:nowrap;border:0}
.filelist{list-style:none;margin:10px 0 0;padding:0}
.fileitem{display:flex;align-items:center;justify-content:space-between;gap:10px;
  padding:8px 12px;border:1px solid #ececec;border-radius:6px;margin-bottom:6px;background:#fff;font-size:14px}
.fi-name{word-break:break-all}
.fi-del{border:none;background:none;color:#a12;font-size:16px;line-height:1;cursor:pointer;padding:2px 8px;flex:0 0 auto}
.fi-del:hover{color:#d00}
.footer{text-align:center;color:var(--muted);font-size:12px;margin-top:20px;line-height:1.5}
.footer a{color:var(--muted);text-decoration:underline}
@media(max-width:600px){
  .card{padding:20px}
  body{font-size:17px}
}