:root {
  color-scheme: light;
  --ink: #18263b;
  --ink-soft: #526176;
  --canvas: #f3f6f9;
  --paper: #fff;
  --line: #dce3eb;
  --accent: #a42c37;
  --accent-dark: #7c1f29;
  --focus: #d28b31;
}
* { box-sizing: border-box; }
body {
  background: var(--canvas);
  color: var(--ink);
  display: flex;
  flex-direction: column;
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  margin: 0;
  min-height: 100vh;
}
button, input { font: inherit; }
button:focus-visible, input:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
.login-header, .login-shell, .login-footer { margin-inline: auto; max-width: 1180px; width: calc(100% - 80px); }
.login-header { align-items: center; display: flex; gap: 14px; min-height: 68px; }
.brand-mark {
  color: var(--accent);
  font: 700 25px/1 "Songti SC", "STSong", "Noto Serif CJK SC", Georgia, serif;
  letter-spacing: -.09em;
}
.brand-rule { background: var(--line); height: 19px; width: 1px; }
.brand-name { color: var(--ink-soft); font-size: 13px; font-weight: 650; letter-spacing: .09em; }
.login-shell {
  align-items: center;
  display: grid;
  flex: 1;
  gap: clamp(42px, 8vw, 112px);
  grid-template-columns: minmax(0, 1fr) minmax(320px, 430px);
  padding-block: 72px 96px;
}
.eyebrow, .card-eyebrow { color: var(--accent); font-size: 11px; font-weight: 800; letter-spacing: .16em; margin: 0 0 16px; }
.login-intro h1 {
  font: 700 clamp(42px, 4.6vw, 66px)/1.25 "Songti SC", "STSong", "Noto Serif CJK SC", Georgia, serif;
  letter-spacing: -.05em;
  margin: 0;
}
.login-intro h1 span { color: var(--accent); }
.login-intro > p:not(.eyebrow) { color: var(--ink-soft); font-size: 16px; line-height: 1.9; margin: 25px 0 0; max-width: 540px; }
.intro-rule { background: var(--line); height: 1px; margin: 62px 0 16px; max-width: 150px; }
.intro-caption { color: var(--ink-soft); font-size: 12px; font-weight: 650; letter-spacing: .05em; }
.login-card { background: var(--paper); border: 1px solid var(--line); border-radius: 9px; box-shadow: 0 26px 70px rgba(24, 38, 59, .055); padding: clamp(28px, 4vw, 46px); }
.card-rule { background: var(--accent); height: 3px; margin-bottom: 32px; width: 54px; }
.card-eyebrow { margin-bottom: 8px; }
.login-card h2 { font-size: 27px; letter-spacing: -.025em; line-height: 1.3; margin: 0; }
.card-description { color: var(--ink-soft); font-size: 14px; margin: 12px 0 30px; }
.form-error { background: #fff2f2; border-left: 3px solid var(--accent); color: #872732; font-size: 13px; margin: -10px 0 22px; padding: 10px 12px; }
.login-card form { display: flex; flex-direction: column; }
.login-card label { color: var(--ink); font-size: 13px; font-weight: 700; margin-bottom: 8px; }
.login-card input:not([type="hidden"]) { appearance: none; background: #fff; border: 1px solid #cbd5e0; border-radius: 6px; color: var(--ink); min-height: 48px; padding: 10px 14px; width: 100%; }
.login-card input:not([type="hidden"]):hover { border-color: #97a8ba; }
.login-card input:not([type="hidden"]):focus { border-color: var(--accent); }
.login-card input:not([type="hidden"]) + label { margin-top: 22px; }
.login-card button { align-items: center; background: var(--accent); border: 1px solid var(--accent); border-radius: 6px; color: #fff; cursor: pointer; display: flex; font-size: 14px; font-weight: 750; justify-content: space-between; margin-top: 30px; min-height: 49px; padding: 11px 16px; transition: background .18s ease, transform .18s ease; }
.login-card button:hover { background: var(--accent-dark); transform: translateY(-1px); }
.login-footer { border-top: 1px solid var(--line); color: var(--ink-soft); font-size: 12px; padding-block: 22px 32px; }
@media (max-width: 760px) {
  .login-header, .login-shell, .login-footer { width: calc(100% - 32px); }
  .login-shell { align-items: stretch; gap: 38px; grid-template-columns: 1fr; padding-block: 36px 54px; }
  .login-intro h1 { font-size: clamp(38px, 10vw, 51px); }
  .login-intro > p:not(.eyebrow) { font-size: 14px; line-height: 1.75; margin-top: 18px; }
  .intro-rule, .intro-caption { display: none; }
  .login-card { padding: 28px 24px 31px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: .01ms !important; }
}