:root {
  --yk-blue: #2563eb;
  --yk-blue-strong: #1d4ed8;
  --yk-ink: #0f172a;
  --yk-text: #334155;
  --yk-muted: #64748b;
  --yk-border: #d8e0eb;
  --yk-canvas: #f6f8fc;
  --yk-focus: rgba(37, 99, 235, 0.13);
}

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

html,
body {
  min-height: 100%;
  margin: 0;
}

body.yk-login-page {
  min-width: 320px;
  background: #fff;
  color: var(--yk-ink);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.yk-login-page button,
.yk-login-page input {
  font: inherit;
}

.yk-login-shell {
  display: grid;
  grid-template-columns: minmax(520px, 44%) minmax(0, 56%);
  min-height: 100vh;
  min-height: 100dvh;
  background: #fff;
}

.yk-login-panel {
  position: relative;
  z-index: 2;
  display: flex;
  min-height: 100vh;
  min-height: 100dvh;
  border-right: 1px solid var(--yk-border);
  background: #fff;
}

.yk-login-panel__inner {
  display: flex;
  flex: 0 1 430px;
  flex-direction: column;
  width: calc(100% - 64px);
  max-width: 430px;
  min-height: 100%;
  margin: 0 auto;
  padding: clamp(72px, 13vh, 132px) 0 42px;
}

.yk-login-brand {
  display: flex;
  align-items: center;
  gap: 18px;
}

.yk-login-brand__seal {
  display: block;
  width: 92px;
  height: 92px;
  object-fit: contain;
  border-radius: 50%;
}

.yk-login-brand__copy {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: 1px;
}

.yk-login-brand__university {
  color: #123a75;
  font-size: clamp(27px, 2.2vw, 36px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.yk-login-brand__platform {
  color: var(--yk-blue);
  font-size: 21px;
  font-weight: 500;
  line-height: 1.45;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.yk-login-main {
  margin-top: clamp(52px, 8vh, 84px);
}

.yk-login-title {
  margin: 0;
  color: var(--yk-ink);
  font-size: clamp(32px, 3vw, 44px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: 0.01em;
}

.yk-login-subtitle {
  margin: 10px 0 30px;
  color: var(--yk-muted);
  font-size: 18px;
  line-height: 1.7;
}

.yk-login-form {
  display: grid;
  gap: 20px;
}

.yk-login-field {
  display: grid;
  gap: 8px;
}

.yk-login-field > label {
  color: var(--yk-ink);
  font-size: 15px;
  font-weight: 600;
}

.yk-login-control {
  position: relative;
}

.yk-login-control > ion-icon {
  position: absolute;
  top: 50%;
  left: 16px;
  z-index: 1;
  color: #8793a6;
  font-size: 22px;
  pointer-events: none;
  transform: translateY(-50%);
}

.yk-login-input {
  width: 100%;
  height: 60px;
  padding: 0 52px;
  border: 1px solid var(--yk-border);
  border-radius: 8px;
  outline: none;
  background: #fff;
  color: var(--yk-ink);
  font-size: 15px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.yk-login-input::placeholder {
  color: #9aa5b5;
}

.yk-login-input:hover {
  border-color: #b8c4d4;
}

.yk-login-input:focus {
  border-color: var(--yk-blue);
  box-shadow: 0 0 0 4px var(--yk-focus);
}

.yk-password-toggle {
  position: absolute;
  top: 50%;
  right: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: #7c889b;
  cursor: pointer;
  transform: translateY(-50%);
}

.yk-password-toggle:hover,
.yk-password-toggle:focus-visible {
  background: #f1f5f9;
  color: var(--yk-blue-strong);
  outline: none;
}

.yk-password-toggle ion-icon {
  font-size: 22px;
}

.yk-password-toggle .is-hidden {
  display: none;
}

.yk-login-options {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: -3px;
}

.yk-login-remember {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--yk-text);
  cursor: pointer;
}

.yk-login-remember input {
  width: 18px;
  height: 18px;
  margin: 0;
  accent-color: var(--yk-blue);
}

.yk-login-link {
  color: var(--yk-blue);
  font-weight: 600;
  text-decoration: none;
}

.yk-login-link:hover,
.yk-login-link:focus-visible {
  color: var(--yk-blue-strong);
  text-decoration: underline;
  outline: none;
}

.yk-login-submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  width: 100%;
  min-height: 58px;
  margin-top: 4px;
  padding: 0 24px;
  border: 1px solid var(--yk-blue);
  border-radius: 8px;
  background: var(--yk-blue);
  color: #fff;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.08em;
  cursor: pointer;
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.16);
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.yk-login-submit:hover {
  border-color: var(--yk-blue-strong);
  background: var(--yk-blue-strong);
}

.yk-login-submit:active {
  transform: translateY(1px);
}

.yk-login-submit:focus-visible {
  outline: 4px solid var(--yk-focus);
  outline-offset: 2px;
}

.yk-login-submit ion-icon {
  font-size: 21px;
}

.yk-init-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.yk-init-actions a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 8px 12px;
  border: 1px solid #bfdbfe;
  border-radius: 8px;
  background: #eff6ff;
  color: var(--yk-blue-strong);
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
}

.yk-login-footer {
  margin-top: auto;
  padding-top: 28px;
  text-align: center;
}

.yk-login-footer::before {
  display: block;
  width: 100%;
  height: 1px;
  margin-bottom: 20px;
  background: var(--yk-border);
  content: "";
}

.yk-login-footer__links,
.yk-login-footer__credit,
.yk-login-footer__copyright {
  margin: 0;
}

.yk-login-footer__links {
  color: #7b8798;
  font-size: 13px;
}

.yk-login-footer__credit {
  margin-top: 8px;
  color: #687589;
  font-size: 12px;
  font-weight: 600;
}

.yk-login-footer__copyright {
  margin-top: 4px;
  color: #94a3b8;
  font-size: 11px;
}

.yk-login-hero {
  position: relative;
  min-width: 0;
  min-height: 100vh;
  min-height: 100dvh;
  overflow: hidden;
  background: var(--yk-canvas);
}

.yk-login-hero__image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center center;
}

.yk-login-hero__caption {
  position: absolute;
  right: clamp(36px, 5vw, 84px);
  bottom: clamp(64px, 12vh, 128px);
  left: clamp(36px, 4.5vw, 72px);
  max-width: 590px;
  padding: 30px 34px;
  background: rgba(29, 78, 216, 0.96);
  color: #fff;
  box-shadow: 0 10px 30px rgba(15, 42, 90, 0.18);
}

.yk-login-hero__caption strong,
.yk-login-hero__caption span {
  display: block;
}

.yk-login-hero__caption strong {
  font-size: clamp(20px, 2vw, 27px);
  font-weight: 700;
  line-height: 1.45;
}

.yk-login-hero__caption span {
  margin-top: 8px;
  font-size: 17px;
  line-height: 1.6;
}

.yk-login-page .oh-alert-container {
  position: fixed;
  z-index: 50;
  top: 18px;
  right: 18px;
  width: min(420px, calc(100vw - 36px));
}

@media (max-width: 1080px) {
  .yk-login-shell {
    grid-template-columns: minmax(470px, 48%) minmax(0, 52%);
  }

  .yk-login-panel__inner {
    flex-basis: 400px;
    width: calc(100% - 52px);
    max-width: 400px;
  }

  .yk-login-brand__seal {
    width: 78px;
    height: 78px;
  }

  .yk-login-brand__platform {
    font-size: 18px;
  }
}

@media (max-width: 820px) {
  .yk-login-shell {
    display: block;
    min-height: 100vh;
    background: var(--yk-canvas);
  }

  .yk-login-panel {
    min-height: 100vh;
    border-right: 0;
  }

  .yk-login-panel__inner {
    flex-basis: 430px;
    width: calc(100% - 48px);
    max-width: 430px;
    padding: 42px 0 32px;
  }

  .yk-login-hero {
    display: none;
  }
}

@media (max-width: 520px) {
  .yk-login-panel__inner {
    width: calc(100% - 40px);
    max-width: 430px;
    padding: 28px 0 24px;
  }

  .yk-login-brand {
    gap: 12px;
  }

  .yk-login-brand__seal {
    width: 64px;
    height: 64px;
  }

  .yk-login-brand__university {
    font-size: 25px;
  }

  .yk-login-brand__platform {
    font-size: 16px;
  }

  .yk-login-main {
    margin-top: 42px;
  }

  .yk-login-title {
    font-size: 31px;
  }

  .yk-login-subtitle {
    margin-bottom: 24px;
    font-size: 16px;
  }

  .yk-login-input {
    height: 54px;
  }

  .yk-login-submit {
    min-height: 54px;
  }

  .yk-init-actions {
    grid-template-columns: 1fr;
  }
}

@media (max-height: 760px) and (min-width: 821px) {
  .yk-login-panel__inner {
    padding-top: 30px;
    padding-bottom: 24px;
  }

  .yk-login-brand__seal {
    width: 68px;
    height: 68px;
  }

  .yk-login-main {
    margin-top: 30px;
  }

  .yk-login-subtitle {
    margin-bottom: 20px;
  }

  .yk-login-form {
    gap: 14px;
  }

  .yk-login-input {
    height: 52px;
  }

  .yk-login-submit {
    min-height: 52px;
  }

  .yk-login-footer {
    padding-top: 18px;
  }
}

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