body {
  margin: 0;
  background: #070b12;
  color: #f2f3f5;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
}
main {
  max-width: 560px;
  margin: 0 auto;
  padding: 24px 18px 48px;
}
h1 { font-size: 26px; margin: 0 0 8px; }
h2 { font-size: 20px; margin: 24px 0 8px; }
.lead { color: #b9c2ce; line-height: 1.45; }
form {
  background: #0b1220;
  border: 1px solid #1d2a3d;
  padding: 18px;
  margin-top: 18px;
}
label { display: block; font-size: 14px; font-weight: 600; margin: 14px 0 6px; }
input[type="text"], input[type="password"], input[type="url"], select {
  width: 100%;
  box-sizing: border-box;
  padding: 12px;
  font-size: 16px;
  background: #070b12;
  color: #f2f3f5;
  border: 1px solid #2a3a52;
}
.check {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-weight: 400;
  margin-top: 16px;
}
.check input { width: 20px; height: 20px; margin-top: 2px; }
button {
  width: 100%;
  margin-top: 20px;
  padding: 14px;
  font-size: 17px;
  font-weight: 600;
  background: #0a84ff;
  color: #fff;
  border: 0;
  cursor: pointer;
}
.error {
  background: #3a1420;
  border: 1px solid #7a2436;
  padding: 12px;
  margin-top: 12px;
  font-size: 14px;
}
.hint { color: #8fa0b5; font-size: 14px; line-height: 1.45; }
.hint.warn { color: #ffb340; }
#qrcode {
  display: flex;
  justify-content: center;
  margin: 16px 0;
  padding: 16px;
  background: #fff;
  border-radius: 8px;
}
#qrcode canvas, #qrcode img { max-width: 100%; height: auto; }