* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", sans-serif;
  background: #f6f4f0;
  padding: 24px 16px;
  color: #1a1a1a;
}
.card {
  max-width: 420px;
  margin: 0 auto;
  background: #fff;
  border-radius: 16px;
  padding: 24px 20px;
  box-shadow: 0 8px 32px rgba(0,0,0,.06);
}
h1 { font-size: 20px; margin: 0 0 8px; }
.sub { font-size: 13px; color: #666; margin-bottom: 16px; }
label { display: block; font-size: 13px; margin: 12px 0 6px; }
input {
  width: 100%;
  padding: 12px;
  font-size: 16px;
  border: 1px solid #ddd;
  border-radius: 10px;
}
.btn {
  width: 100%;
  margin-top: 20px;
  padding: 14px;
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  background: #111;
  border: none;
  border-radius: 12px;
}
.msg {
  padding: 12px;
  border-radius: 10px;
  font-size: 14px;
  margin-bottom: 12px;
  display: none;
}
.msg.ok { display: block; background: #ecfdf5; color: #065f46; }
.msg.err { display: block; background: #fef2f2; color: #991b1b; }
.steps { font-size: 13px; color: #555; padding-left: 1.2em; margin: 0 0 12px; }