:root {
  --login-deep: #182c57;
  --login-indigo: #203d80;
  --login-door: #5c7fd9;
  --login-porcelain: #f2f6fe;
  --login-ink: #1c2942;
  --login-muted: #6f7c96;
  --login-line: #cbd6e9;
  --login-error: #b42318;
}

.login-body {
  min-height: 100dvh;
  margin: 0;
  background: var(--login-porcelain);
  color: var(--login-ink);
  font-family: "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}

.login-body * { box-sizing: border-box; }

.login-layout {
  display: grid;
  grid-template-columns: minmax(330px, 38%) minmax(0, 62%);
  min-height: 100dvh;
}

/* 门廊 */
.login-portal {
  position: relative;
  display: flex;
  min-height: 100dvh;
  flex-direction: column;
  justify-content: space-between;
  padding: clamp(28px, 4vw, 54px) clamp(28px, 4.4vw, 64px);
  overflow: hidden;
  background:
    radial-gradient(700px 520px at 16% 12%, rgba(92, 127, 217, .18), transparent 66%),
    linear-gradient(164deg, #1b315f 0%, var(--login-deep) 62%, #142442 100%);
  color: #fff;
}

.portal-frame {
  position: absolute;
  left: 50%;
  bottom: 0;
  width: min(62%, 300px);
  height: min(56vh, 500px);
  transform: translateX(-50%);
  border: 1px solid rgba(235, 242, 255, .22);
  border-bottom: 0;
  border-radius: 180px 180px 0 0;
  pointer-events: none;
}

.portal-frame::before {
  content: "";
  position: absolute;
  inset: 18px 18px 0;
  border: 1px solid rgba(235, 242, 255, .09);
  border-bottom: 0;
  border-radius: 160px 160px 0 0;
}

.portal-frame::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 42px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, rgba(92, 127, 217, .55), transparent 78%);
}

.portal-brand, .portal-context { position: relative; z-index: 1; }
.portal-brand img { display: block; width: clamp(158px, 15vw, 196px); height: auto; }

.portal-context {
  margin: 0;
  color: rgba(235, 242, 255, .55);
  font-size: 11px;
  letter-spacing: .08em;
}

/* 工作平面 */
.login-panel {
  display: flex;
  min-height: 100dvh;
  align-items: center;
  padding: 72px clamp(40px, 8vw, 136px);
  background:
    radial-gradient(760px 560px at 100% 0%, rgba(92, 127, 217, .07), transparent 68%),
    var(--login-porcelain);
}

.login-form {
  width: min(100%, 366px);
  margin-right: auto;
  animation: login-enter 260ms ease-out both;
}

.login-form-head { margin-bottom: 40px; }
.login-form-head h1 {
  margin: 0;
  color: var(--login-indigo);
  font-size: clamp(34px, 3.4vw, 43px);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -.045em;
}
.login-form-head p {
  margin: 11px 0 0;
  color: var(--login-muted);
  font-size: 13px;
  line-height: 1.7;
}

.login-field {
  display: grid;
  gap: 7px;
  margin-bottom: 25px;
  border-bottom: 1px solid var(--login-line);
  transition: border-color 160ms ease;
}
.login-field:focus-within { border-color: var(--login-indigo); }
.login-field label {
  color: var(--login-indigo);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .02em;
}
.login-field input {
  width: 100%;
  height: 42px;
  padding: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--login-ink);
  font: inherit;
  font-size: 15px;
}
.login-field input::placeholder { color: #9ba7bc; }
.login-field input:-webkit-autofill {
  -webkit-text-fill-color: var(--login-ink);
  transition: background-color 9999s ease-in-out 0s;
}

.login-submit {
  width: 100%;
  height: 48px;
  margin-top: 8px;
  border: 1px solid var(--login-indigo);
  border-radius: 4px;
  background: var(--login-indigo);
  color: #fff;
  font: inherit;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .02em;
  cursor: pointer;
  transition: background-color 160ms ease, border-color 160ms ease;
}
.login-submit:hover { background: var(--login-deep); border-color: var(--login-deep); }
.login-submit:active { background: #142442; border-color: #142442; }
.login-submit:focus-visible { outline: 3px solid rgba(92, 127, 217, .34); outline-offset: 3px; }
.login-submit.is-busy { opacity: .7; pointer-events: none; }

.login-error {
  min-height: 18px;
  margin-top: 10px;
  color: var(--login-error);
  font-size: 12px;
  line-height: 1.5;
}

@keyframes login-enter {
  from { opacity: 0; transform: translateY(7px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 780px) {
  .login-layout { display: block; }
  .login-portal {
    min-height: 228px;
    height: 228px;
    padding: 22px 24px;
    justify-content: flex-start;
  }
  .portal-brand img { width: 164px; }
  .portal-frame {
    left: auto;
    right: 18px;
    bottom: 0;
    width: 170px;
    height: 190px;
    transform: none;
  }
  .portal-context { display: none; }
  .login-panel {
    min-height: calc(100dvh - 228px);
    align-items: flex-start;
    padding: 48px 24px 40px;
    background: #fff;
  }
  .login-form { width: 100%; margin: 0; }
  .login-form-head { margin-bottom: 34px; }
  .login-form-head h1 { font-size: 32px; }
}

@media (prefers-reduced-motion: reduce) {
  .login-form { animation: none; }
  .login-field, .login-submit { transition: none; }
}

.login-field input,
.login-field input:focus,
.login-field input:focus-visible {
  border: 0;
  border-radius: 0;
  outline: 0;
  box-shadow: none;
}