:root {
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
  color: #172033;
  background: #f2f5fa;
}

* { box-sizing: border-box; }

body {
  min-height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  background: radial-gradient(circle at 20% 10%, #e3efff 0, transparent 36%), #f3f6fb;
}

.card {
  width: min(620px, 100%);
  background: #fff;
  border: 1px solid #e1e7f0;
  border-radius: 18px;
  padding: 42px;
  box-shadow: 0 18px 55px rgba(31, 54, 91, 0.12);
}

.eyebrow { color: #1769e0; font-weight: 700; letter-spacing: 0.12em; }
h1 { margin: 10px 0 14px; font-size: clamp(26px, 5vw, 36px); line-height: 1.25; }
.intro { color: #5f6b7c; line-height: 1.8; margin-bottom: 28px; }
form { display: grid; gap: 12px; }
label { font-weight: 700; margin-top: 6px; }

input {
  width: 100%;
  border: 1px solid #cfd8e6;
  border-radius: 10px;
  padding: 13px 14px;
  font: inherit;
  outline: none;
}

input:focus { border-color: #1769e0; box-shadow: 0 0 0 3px rgba(23, 105, 224, 0.13); }
.hint { color: #7b8797; font-size: 13px; margin: -4px 0 8px; }

button {
  border: 0;
  border-radius: 11px;
  padding: 14px 20px;
  background: #1769e0;
  color: #fff;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

button:disabled { opacity: 0.65; cursor: wait; }
.status { margin-top: 18px; min-height: 24px; color: #536174; }
.status.error { color: #c62828; }
.status.success { color: #137333; }

@media (max-width: 560px) {
  .card { padding: 28px 22px; }
}