:root {
  --auth-blue: #165dff;
  --auth-ink: #081a33;
  --auth-muted: #657b96;
  --auth-line: rgba(9, 26, 51, 0.1);
}
* { box-sizing: border-box; }
html, body { min-height: 100%; }
body {
  margin: 0;
  color: var(--auth-ink);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
  background:
    radial-gradient(circle at 18% 18%, rgba(66, 217, 255, 0.16), transparent 32%),
    radial-gradient(circle at 82% 12%, rgba(22, 93, 255, 0.13), transparent 34%),
    linear-gradient(180deg, #f8fbff 0%, #eef5ff 100%);
}
.auth-shell {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 32px 20px;
}
.auth-card {
  width: min(440px, 100%);
  padding: 38px 40px 30px;
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.93);
  box-shadow: 0 24px 70px rgba(20, 58, 120, 0.13), 0 4px 14px rgba(20, 58, 120, 0.05);
  backdrop-filter: blur(20px);
}
.auth-brand { display: inline-flex; margin-bottom: 32px; }
.auth-brand img { display: block; width: 156px; height: auto; }
.auth-eyebrow {
  margin: 0 0 10px;
  color: var(--auth-blue);
  font-family: Montserrat, sans-serif;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.22em;
}
h1 {
  margin: 0 0 12px;
  font-size: 30px;
  font-weight: 500;
  letter-spacing: -0.04em;
}
.auth-lead {
  margin: 0 0 24px;
  color: var(--auth-muted);
  font-size: 14px;
  line-height: 1.8;
}
.auth-error {
  margin: 0 0 18px;
  padding: 11px 13px;
  border: 1px solid rgba(220, 48, 48, 0.16);
  border-radius: 8px;
  background: rgba(220, 48, 48, 0.06);
  color: #b42318;
  font-size: 13px;
  line-height: 1.6;
}
.auth-field { display: block; margin: 0 0 16px; }
.auth-field span {
  display: block;
  margin-bottom: 7px;
  color: #3f536b;
  font-size: 13px;
  font-weight: 500;
}
.auth-field input {
  width: 100%;
  height: 46px;
  padding: 0 13px;
  border: 1px solid var(--auth-line);
  border-radius: 8px;
  outline: none;
  background: #fff;
  color: var(--auth-ink);
  font: inherit;
  font-size: 14px;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.auth-field input:focus {
  border-color: rgba(22, 93, 255, 0.55);
  box-shadow: 0 0 0 3px rgba(22, 93, 255, 0.1);
}
.auth-submit {
  width: 100%;
  height: 46px;
  margin-top: 4px;
  border: 0;
  border-radius: 8px;
  background: var(--auth-blue);
  color: #fff;
  cursor: pointer;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  transition: background-color 0.2s, transform 0.2s;
}
.auth-submit:hover { background: #0e4fe0; }
.auth-submit:active { transform: translateY(1px); }
.auth-hint {
  margin: 18px 0 24px;
  color: #8a9db2;
  font-size: 12px;
  line-height: 1.7;
}
.auth-foot {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 18px;
  border-top: 1px solid rgba(9, 26, 51, 0.07);
  color: #91a4bb;
  font-size: 11px;
  line-height: 1.6;
}
@media (max-width: 520px) {
  .auth-card { padding: 28px 22px 24px; border-radius: 18px; }
  .auth-brand img { width: 136px; }
  h1 { font-size: 26px; }
}