.login-body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 40px 20px;
  background:
    radial-gradient(820px 460px at 88% -8%, rgba(80, 128, 255, .18), transparent 66%),
    radial-gradient(680px 440px at 4% 24%, rgba(29, 190, 159, .13), transparent 68%),
    radial-gradient(560px 400px at 60% 108%, rgba(124, 92, 231, .1), transparent 70%),
    var(--bg);
}

.login-stage {
  width: min(940px, 100%);
  animation: login-rise .6s cubic-bezier(.22, .78, .3, 1) both;
}

@keyframes login-rise {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: none; }
}

.login-card {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, .9);
  border-radius: 32px;
  background: rgba(255, 255, 255, .82);
  box-shadow: 0 40px 90px rgba(30, 60, 110, .16);
  -webkit-backdrop-filter: blur(20px) saturate(1.3);
  backdrop-filter: blur(20px) saturate(1.3);
}

.login-aside {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 40px;
  padding: 34px 30px;
  color: #EAF1FF;
  background:
    radial-gradient(420px 260px at 100% 0%, rgba(62, 99, 242, .5), transparent 68%),
    radial-gradient(340px 260px at 0% 100%, rgba(29, 190, 159, .34), transparent 70%),
    #0C1A2D;
}

.login-aside::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .05) 1px, transparent 1px);
  background-size: 30px 30px;
  -webkit-mask-image: radial-gradient(320px 260px at 70% 20%, #000, transparent 78%);
  mask-image: radial-gradient(320px 260px at 70% 20%, #000, transparent 78%);
  pointer-events: none;
}

.aside-top {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 13px;
}

.aside-kicker {
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: .18em;
  color: rgba(226, 237, 255, .62);
}

.aside-body {
  position: relative;
  z-index: 1;
}

.aside-body h2 {
  font-size: 30px;
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -.03em;
}

.aside-body p {
  margin-top: 14px;
  max-width: 24ch;
  color: rgba(214, 228, 248, .72);
  font-size: 13.5px;
  line-height: 1.75;
}

.aside-dots {
  position: relative;
  z-index: 1;
  display: flex;
  gap: 7px;
}

.aside-dots li {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: rgba(226, 237, 255, .26);
}

.aside-dots li:first-child {
  width: 22px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--primary), var(--mint));
}

.login-panel {
  padding: 42px 44px 38px;
}

.login-panel h1 {
  margin-top: 20px;
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -.04em;
}

.login-sub {
  margin-top: 9px;
  color: var(--muted);
  font-size: 14px;
}

.login-form {
  margin-top: 28px;
  display: grid;
  gap: 15px;
}

.login-form label {
  display: grid;
  gap: 7px;
  color: #40546C;
  font-size: 12.5px;
  font-weight: 700;
}

.login-form input {
  width: 100%;
  padding: 13px 15px;
  border: 1px solid rgba(25, 54, 92, .11);
  border-radius: 14px;
  outline: none;
  background: rgba(255, 255, 255, .94);
  color: var(--ink);
  font: inherit;
  font-size: 14px;
  font-weight: 500;
  transition: border-color .2s ease, box-shadow .2s ease, background-color .2s ease;
}

.login-form input::placeholder {
  color: #9AA9BA;
  font-weight: 400;
}

.login-form input:focus {
  border-color: rgba(62, 99, 242, .48);
  background: #fff;
  box-shadow: 0 0 0 4px rgba(62, 99, 242, .09);
}

.login-form input:disabled {
  background: #F3F6FB;
  color: var(--muted);
}

.field-error {
  display: none;
  color: #D94553;
  font-size: 12.5px;
  font-weight: 600;
}

.field-error:not(:empty) {
  display: block;
  margin-top: -3px;
}

.form-alert {
  display: none;
  padding: 11px 14px;
  border: 1px solid rgba(217, 69, 83, .2);
  border-radius: 14px;
  background: rgba(217, 69, 83, .07);
  color: #B7303D;
  font-size: 13px;
  font-weight: 600;
}

.form-alert:not(:empty) {
  display: block;
}

.login-submit {
  margin-top: 6px;
  width: 100%;
}

.login-submit[disabled] {
  opacity: .62;
  cursor: progress;
  transform: none !important;
}

.login-back {
  margin-top: 24px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
  transition: color .2s ease, transform .2s ease;
}

.login-back:hover {
  color: var(--primary);
  transform: translateX(-3px);
}

.login-member-link {
  display: inline-flex;
  margin-top: 8px;
  padding-left: 23px;
  color: #5A6679;
  font-size: 12.5px;
  font-weight: 500;
  transition: color .2s ease;
}

.login-member-link:hover {
  color: var(--primary);
}

.login-foot {
  margin-top: 22px;
  color: #5A6679;
  font-size: 12.5px;
  text-align: center;
}

@media (max-width: 899.98px) {
  .login-card {
    grid-template-columns: minmax(0, 1fr);
    max-width: 460px;
    margin-inline: auto;
  }

  .login-aside {
    display: none;
  }

  .login-panel {
    padding: 36px 30px 32px;
  }

  /* 页脚两条文字入口只有一行高，手机端补齐拇指区（方案 3 / 9） */
  .login-back,
  .login-member-link {
    align-items: center;
    min-height: var(--touch, 44px);
  }
}

@media (max-width: 419.98px) {
  .login-body {
    padding: 24px 14px;
  }

  .login-card {
    border-radius: 26px;
  }

  .login-panel {
    padding: 30px 22px 26px;
  }

  .login-panel h1 {
    font-size: 27px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .login-stage {
    animation: none;
  }

  .login-back,
  .login-submit {
    transition: none;
  }
}