:root {
  --login-navy-deep: #13263C;
  --login-navy-mid: #1D3C62;
  --login-navy-border: #25466F;
  --login-gold: #D8BA7C;
  --login-stage-bg: #ECF2FA;
  --login-surface: #FFFFFF;
  --login-border: #D5E0EE;
  --login-border-strong: #BCCBE0;
  --login-primary: #2463D8;
  --login-primary-hover: #1C51B5;
  --login-primary-active: #164399;
  --login-primary-ring: rgba(36, 99, 216, 0.18);
  --login-text: #16283D;
  --login-text-sec: #4C6078;
  --login-text-muted: #6E8198;
  --login-ok-text: #1B7357;
  --login-ok-bg: #EAF7F2;
  --login-ok-border: #B6E1D1;
  --login-err-text: #B42E36;
  --login-err-bg: #FCECEE;
  --login-err-border: #F1C0C6;
  --login-radius-sm: 6px;
  --login-radius-md: 10px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  overflow-x: clip;
  font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Segoe UI', -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: var(--login-text);
  background: var(--login-stage-bg);
  -webkit-font-smoothing: antialiased;
}

.login-shell {
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  grid-template-columns: minmax(480px, 1.12fr) minmax(440px, 0.88fr);
}

/* Left Deep-Sea Brand & Campus Architecture Column */
.login-showcase {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background:
    radial-gradient(circle at 72% 68%, rgba(44, 102, 188, 0.24) 0%, rgba(19, 38, 60, 0) 62%),
    linear-gradient(155deg, #102033 0%, var(--login-navy-deep) 46%, var(--login-navy-mid) 100%);
  color: #F2F6FC;
  border-right: 1px solid var(--login-navy-border);
  overflow: hidden;
  min-width: 0;
}

.login-showcase-inner {
  flex: 1;
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding: 56px 56px 36px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 24px;
  min-width: 0;
}

.login-brand-block {
  position: relative;
  z-index: 1;
  min-width: 0;
}

.login-joint-emblem {
  display: inline-flex;
  align-items: flex-end;
  gap: 4px;
  height: 18px;
  margin-bottom: 18px;
}

.emblem-bar {
  display: block;
  width: 4px;
  border-radius: 1.5px 1.5px 0 0;
}

.emblem-bar.is-gold {
  height: 12px;
  background: var(--login-gold);
}

.emblem-bar.is-blue {
  height: 18px;
  background: #5C98F5;
}

.emblem-bar.is-light {
  height: 14px;
  background: #DCE8F8;
}

.login-brand-title {
  margin: 0;
  color: #FFFFFF;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.28;
}

.login-brand-org {
  display: block;
  font-size: 19px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: #DCE7F5;
  margin-bottom: 4px;
}

.login-brand-name {
  display: block;
  font-size: 32px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: #FFFFFF;
}

.login-brand-pillars {
  margin: 18px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--login-gold);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: #B9CCE4;
}

.login-campus-art {
  width: 100%;
  max-width: 640px;
  margin: auto auto 0;
  user-select: none;
  pointer-events: none;
}

.login-campus-art svg {
  display: block;
  width: 100%;
  height: auto;
}

/* Right Light Stage & Refined Form Card */
.login-stage {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 48px;
  background:
    radial-gradient(circle at 85% 15%, #F6F9FE 0%, var(--login-stage-bg) 68%);
  min-width: 0;
}

.login-card {
  position: relative;
  width: 100%;
  max-width: 416px;
  background: var(--login-surface);
  border: 1px solid var(--login-border);
  border-radius: var(--login-radius-md);
  padding: 36px 36px 30px;
  box-shadow:
    0 1px 2px rgba(19, 38, 60, 0.04),
    0 16px 40px rgba(19, 38, 60, 0.07);
  overflow: hidden;
}

.login-card::before {
  content: '';
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--login-gold) 0, var(--login-gold) 56px, var(--login-primary) 56px, var(--login-primary) 100%);
}

.login-card-head {
  margin-bottom: 24px;
}

.login-card-title {
  margin: 0;
  font-size: 22px;
  font-weight: 600;
  line-height: 1.3;
  color: var(--login-navy-deep);
  letter-spacing: 0.01em;
}

.login-subtitle {
  margin: 6px 0 0;
  font-size: 13.5px;
  color: var(--login-text-sec);
}

.login-banner {
  margin-bottom: 18px;
  padding: 10px 12px;
  border-radius: var(--login-radius-sm);
  font-size: 13px;
  line-height: 1.45;
  overflow-wrap: break-word;
}

.login-banner.is-error {
  color: var(--login-err-text);
  background: var(--login-err-bg);
  border: 1px solid var(--login-err-border);
}

.login-banner.is-success {
  color: var(--login-ok-text);
  background: var(--login-ok-bg);
  border: 1px solid var(--login-ok-border);
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.login-field {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.login-field label {
  font-size: 13px;
  font-weight: 600;
  color: var(--login-text);
}

.login-field input {
  width: 100%;
  min-width: 0;
  min-height: 42px;
  padding: 9px 12px;
  font: inherit;
  font-size: 14px;
  color: var(--login-text);
  background: #FCFDFE;
  border: 1px solid var(--login-border-strong);
  border-radius: var(--login-radius-sm);
  transition:
    border-color 140ms cubic-bezier(0.2, 0, 0, 1),
    background-color 140ms cubic-bezier(0.2, 0, 0, 1),
    box-shadow 140ms cubic-bezier(0.2, 0, 0, 1);
}

.login-field input::placeholder {
  color: #93A3B8;
}

.login-field input:hover:not(:disabled):not(:focus-visible) {
  border-color: #9CB1CC;
}

.login-field input:focus-visible {
  outline: none;
  background: #FFFFFF;
  border-color: var(--login-primary);
  box-shadow: 0 0 0 3px var(--login-primary-ring);
}

.login-field input:disabled {
  background: #F3F7FC;
  color: var(--login-text-muted);
  cursor: not-allowed;
}

.login-pw-group {
  position: relative;
  display: flex;
  align-items: center;
}

.login-pw-group input {
  padding-right: 42px;
}

.login-pw-toggle {
  position: absolute;
  right: 5px;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 5px;
  color: var(--login-text-muted);
  cursor: pointer;
  transition:
    color 140ms cubic-bezier(0.2, 0, 0, 1),
    background-color 140ms cubic-bezier(0.2, 0, 0, 1);
}

.login-pw-toggle:hover:not(:disabled) {
  color: var(--login-text);
  background: #EEF3FA;
}

.login-pw-toggle:focus-visible {
  outline: 2px solid var(--login-primary);
  outline-offset: 1px;
  color: var(--login-primary);
}

.login-pw-toggle:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.login-pw-toggle .icon-eye-off {
  display: none;
}

.login-pw-toggle.is-visible .icon-eye {
  display: none;
}

.login-pw-toggle.is-visible .icon-eye-off {
  display: block;
}

.login-submit {
  margin-top: 6px;
  width: 100%;
  min-height: 44px;
  padding: 10px 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font: inherit;
  font-size: 14.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: #FFFFFF;
  background: var(--login-primary);
  border: 1px solid var(--login-primary);
  border-radius: var(--login-radius-sm);
  box-shadow: 0 2px 6px rgba(36, 99, 216, 0.2);
  cursor: pointer;
  transition:
    background-color 140ms cubic-bezier(0.2, 0, 0, 1),
    border-color 140ms cubic-bezier(0.2, 0, 0, 1),
    box-shadow 140ms cubic-bezier(0.2, 0, 0, 1),
    transform 100ms cubic-bezier(0.2, 0, 0, 1);
}

.login-submit:hover:not(:disabled) {
  background: var(--login-primary-hover);
  border-color: var(--login-primary-hover);
  box-shadow: 0 4px 12px rgba(28, 81, 181, 0.26);
}

.login-submit:active:not(:disabled) {
  background: var(--login-primary-active);
  border-color: var(--login-primary-active);
  transform: translateY(1px);
}

.login-submit:focus-visible {
  outline: 2px solid var(--login-primary);
  outline-offset: 2px;
}

.login-submit:disabled {
  opacity: 0.65;
  cursor: not-allowed;
  box-shadow: none;
}

.login-spinner {
  display: none;
  width: 15px;
  height: 15px;
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-top-color: #FFFFFF;
  border-radius: 50%;
  animation: login-spin 680ms linear infinite;
}

.login-submit.is-loading .login-spinner {
  display: inline-block;
}

@keyframes login-spin {
  to {
    transform: rotate(360deg);
  }
}

.login-foot {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid #E5ECF5;
  font-size: 12px;
  color: var(--login-text-muted);
  text-align: center;
}

/* 1024px Desktop / Compact Landscape Adaptation */
@media (max-width: 1180px) {
  .login-shell {
    grid-template-columns: minmax(400px, 1.04fr) minmax(380px, 0.96fr);
  }

  .login-showcase-inner {
    padding: 40px 36px 28px;
  }

  .login-brand-org {
    font-size: 17px;
  }

  .login-brand-name {
    font-size: 27px;
  }

  .login-stage {
    padding: 32px 28px;
  }

  .login-card {
    max-width: 396px;
    padding: 32px 28px 26px;
  }
}

/* Tablet Portrait & Mobile Stack (Form Prioritized, Compact Brand) */
@media (max-width: 899px) {
  .login-shell {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto 1fr;
  }

  .login-showcase {
    border-right: none;
    border-bottom: 1px solid var(--login-navy-border);
  }

  .login-showcase-inner {
    max-width: 560px;
    padding: 24px 24px 20px;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
  }

  .login-joint-emblem {
    height: 15px;
    margin-bottom: 10px;
  }

  .login-brand-org {
    font-size: 14px;
    margin-bottom: 2px;
  }

  .login-brand-name {
    font-size: 22px;
  }

  .login-brand-pillars {
    margin-top: 10px;
    font-size: 12.5px;
    letter-spacing: 0.04em;
  }

  .login-campus-art {
    width: 180px;
    flex-shrink: 0;
    margin: 0;
    opacity: 0.9;
  }

  .login-stage {
    align-items: flex-start;
    padding: 28px 20px 36px;
  }

  .login-card {
    max-width: 420px;
  }
}

/* 390px Narrow Mobile Screen */
@media (max-width: 540px) {
  .login-showcase-inner {
    padding: 18px 18px 16px;
  }

  .login-joint-emblem {
    height: 13px;
    margin-bottom: 8px;
  }

  .login-brand-org {
    font-size: 13px;
  }

  .login-brand-name {
    font-size: 19px;
  }

  .login-brand-pillars {
    margin-top: 8px;
    font-size: 12px;
    letter-spacing: 0.03em;
  }

  .login-campus-art {
    display: none;
  }

  .login-stage {
    padding: 18px 14px 28px;
  }

  .login-card {
    padding: 24px 20px 22px;
  }

  .login-card-head {
    margin-bottom: 20px;
  }

  .login-card-title {
    font-size: 20px;
  }

  .login-field input {
    font-size: 16px;
  }
}

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

  .login-spinner {
    animation-duration: 1.6s;
  }
}