:root {
  font-family: "Microsoft YaHei UI", "Microsoft YaHei", system-ui, sans-serif;
  color: #172033;
  background: #f1f5fb;
}

* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; }
.auth-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 28px 18px;
  background:
    radial-gradient(circle at 15% 15%, rgba(37, 99, 235, .14), transparent 32%),
    radial-gradient(circle at 85% 80%, rgba(11, 159, 110, .12), transparent 30%),
    #f5f8fc;
}
.auth-card {
  width: min(460px, 100%);
  background: #fff;
  border: 1px solid #e1e8f1;
  border-radius: 20px;
  padding: 34px;
  box-shadow: 0 24px 70px rgba(30, 50, 80, .12);
}
.auth-card.wide { width: min(680px, 100%); }
.auth-brand { display: flex; align-items: center; gap: 13px; margin-bottom: 25px; }
.auth-mark {
  width: 46px; height: 46px; border-radius: 14px; display: grid; place-items: center;
  color: #fff; font-weight: 800; font-size: 20px;
  background: linear-gradient(145deg, #3e82ff, #1c55d5);
  box-shadow: 0 9px 24px rgba(37, 99, 235, .28);
}
.auth-brand strong { display: block; font-size: 16px; }
.auth-brand span { display: block; color: #8290a5; font-size: 11px; margin-top: 5px; }
h1 { font-size: 25px; margin: 0 0 9px; }
.lead { color: #6f7d92; font-size: 13px; line-height: 1.7; margin: 0 0 24px; }
.auth-form { display: grid; gap: 15px; }
.setup-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.account-box { border: 1px solid #e4e9f1; border-radius: 13px; padding: 18px; background: #fafcff; }
.account-box h2 { font-size: 15px; margin: 0 0 5px; }
.account-box p { color: #8491a4; font-size: 11px; line-height: 1.6; margin: 0 0 15px; }
label { display: block; color: #5d6a7e; font-weight: 700; font-size: 12px; }
input {
  display: block; width: 100%; margin-top: 7px; border: 1px solid #d8e0ea;
  border-radius: 10px; padding: 12px 13px; outline: 0; background: #fff; font: inherit;
}
input:focus { border-color: #70a0f8; box-shadow: 0 0 0 4px #edf3ff; }
.auth-button {
  border: 0; border-radius: 10px; padding: 13px 16px; cursor: pointer;
  color: #fff; background: #2563eb; font-weight: 800; font-size: 14px;
  box-shadow: 0 8px 22px rgba(37, 99, 235, .22);
}
.auth-button:disabled { opacity: .62; cursor: wait; }
.message { min-height: 20px; margin: 2px 0 0; color: #c53e3e; font-size: 12px; line-height: 1.6; }
.message.success { color: #07845c; background: #eaf8f3; border-radius: 9px; padding: 11px 12px; }
.security-note { margin-top: 20px; padding: 13px; border-radius: 10px; background: #f4f7fb; color: #6d7b90; font-size: 11px; line-height: 1.7; }
@media (max-width: 650px) {
  .auth-card { padding: 25px 20px; }
  .setup-grid { grid-template-columns: 1fr; }
}