:root {
  --bg: #fbf7f0;
  --surface: #fffdf9;
  --text: #292522;
  --muted: #756d66;
  --line: #e5ddd1;
  --primary: #812340;
  --primary-dark: #641a32;
  --gold: #b78e44;
  --gold-soft: #f3e8d2;
  --red: #9a3442;
  --red-soft: #fbe9eb;
  --shadow: 0 18px 48px rgba(69, 45, 31, .11);
}
* { box-sizing: border-box; }
html, body { min-height: 100%; }
body {
  margin: 0;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 24px;
  background: radial-gradient(circle at 72% 18%, rgba(225, 181, 108, .2), transparent 34%), var(--bg);
  color: var(--text);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.6;
}
button, input { font: inherit; }
button { cursor: pointer; }
:disabled { opacity: .55; cursor: not-allowed; }
:focus-visible { outline: 3px solid rgba(183, 142, 68, .42); outline-offset: 2px; }
.login-shell { width: min(430px, 100%); }
.login-card {
  padding: 38px 34px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
}
.brand-mark { color: var(--gold); font-size: 11px; font-weight: 700; letter-spacing: .22em; }
h1 { margin: 8px 0 5px; color: var(--primary); font-size: 26px; line-height: 1.25; }
.login-card > p { margin: 0 0 28px; color: var(--muted); }
.field { display: grid; gap: 7px; margin-bottom: 18px; }
.field span { color: var(--muted); font-size: 12px; font-weight: 700; }
.field .required::after { content: " *"; color: var(--red); }
input {
  width: 100%;
  min-height: 48px;
  padding: 11px 14px;
  border: 1px solid #d9cfc1;
  border-radius: 12px;
  background: #fff;
  color: var(--text);
  transition: border-color .16s ease, box-shadow .16s ease;
}
input:focus { border-color: var(--gold); box-shadow: 0 0 0 3px rgba(183, 142, 68, .1); outline: 0; }
.login-btn {
  width: 100%;
  min-height: 48px;
  border: 0;
  border-radius: 12px;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  transition: background .16s ease, transform .16s ease;
}
.login-btn:hover { background: var(--primary-dark); }
.login-btn:active { transform: scale(.99); }
.form-error { min-height: 22px; margin-top: 12px; color: var(--red); font-size: 13px; }
footer { margin-top: 24px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
@media (max-width: 420px) {
  body { padding: 14px; }
  .login-card { padding: 28px 22px; border-radius: 20px; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}