:root {
  --yl-white: #ffffff;
  --yl-black: #000000;

  --yl-blue-50:  #eff6ff;
  --yl-blue-100: #dbeafe;
  --yl-blue-200: #bfdbfe;
  --yl-blue-300: #93c5fd;
  --yl-blue-400: #60a5fa;
  --yl-blue-500: #2563eb;
  --yl-blue-600: #1d4ed8;
  --yl-blue-700: #1e40af;

  --yl-gray-50:  #f9fafb;
  --yl-gray-100: #f3f4f6;
  --yl-gray-200: #e5e7eb;
  --yl-gray-300: #d1d5db;
  --yl-gray-400: #9ca3af;
  --yl-gray-500: #6b7280;
  --yl-gray-600: #4b5563;
  --yl-gray-700: #374151;
  --yl-gray-800: #1f2937;
  --yl-gray-900: #111827;

  --yl-red-50:  #fef2f2;
  --yl-red-500: #ef4444;
  --yl-red-600: #dc2626;

  --yl-green-50:  #f0fdf4;
  --yl-green-500: #22c55e;
  --yl-green-600: #16a34a;

  --yl-space-1: 4px;
  --yl-space-2: 8px;
  --yl-space-3: 12px;
  --yl-space-4: 16px;
  --yl-space-6: 24px;
  --yl-space-8: 32px;
  --yl-space-12: 48px;

  --yl-font-xs: 12px;
  --yl-font-sm: 13px;
  --yl-font-base: 15px;
  --yl-font-lg: 18px;
  --yl-font-xl: 24px;
  --yl-font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;
  --yl-leading-tight: 1.25;
  --yl-leading-normal: 1.5;

  --yl-radius-1: 8px;
  --yl-radius-2: 12px;
  --yl-radius-3: 20px;

  --yl-shadow-1: 0 1px 2px rgba(17, 24, 39, 0.06);
  --yl-shadow-2: 0 4px 16px rgba(17, 24, 39, 0.08);
  --yl-shadow-3: 0 12px 32px rgba(17, 24, 39, 0.12);

  --yl-duration-fast: 120ms;
  --yl-duration-base: 200ms;
  --yl-duration-slow: 600ms;
  --yl-easing-standard: cubic-bezier(0.4, 0, 0.2, 1);
  --yl-easing-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

  --yl-control-height: 44px;
  --yl-control-height-lg: 46px;

  --yl-card-max-width: 440px;
  --yl-card-padding: var(--yl-space-8);
  --yl-page-padding: var(--yl-space-6);

  --yl-overlay-bg: rgba(0, 0, 0, 0.40);
}

:root {
  --yl-color-primary: var(--yl-blue-500);
  --yl-color-primary-hover: var(--yl-blue-600);
  --yl-color-primary-active: var(--yl-blue-700);
  --yl-color-primary-soft: var(--yl-blue-50);
  --yl-color-text-on-primary: var(--yl-white);

  --yl-color-text: var(--yl-gray-900);
  --yl-color-text-secondary: var(--yl-gray-500);
  --yl-color-text-placeholder: var(--yl-gray-400);
  --yl-color-text-disabled: var(--yl-gray-400);

  --yl-color-border: var(--yl-gray-200);
  --yl-color-border-hover: var(--yl-gray-300);
  --yl-color-border-focus: var(--yl-blue-500);

  --yl-color-bg-page: var(--yl-gray-100);
  --yl-color-bg-container: var(--yl-white);
  --yl-color-bg-hover: rgba(17, 24, 39, 0.05);

  --yl-color-error: var(--yl-red-500);
  --yl-color-error-soft: var(--yl-red-50);
  --yl-color-success: var(--yl-green-500);
  --yl-color-disabled: var(--yl-gray-200);

  --yl-control-radius: var(--yl-radius-1);
  --yl-card-shadow: var(--yl-shadow-2);
  --yl-input-focus-ring: 0 0 0 3px var(--yl-color-primary-soft);
  --yl-input-error-ring: 0 0 0 3px var(--yl-color-error-soft);

  --yl-glass-bg: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.32) 0%,
    rgba(255, 255, 255, 0.10) 100%
  );
  --yl-glass-blur: 1px;
  --yl-glass-saturate: 180%;
  --yl-glass-border: rgba(255, 255, 255, 0.28);
  --yl-glass-highlight: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.3) 0%,
    rgba(255, 255, 255, 0.08) 30%,
    rgba(255, 255, 255, 0) 55%
  );
  --yl-glass-shadow:
    0 8px 32px rgba(17, 24, 39, 0.16),
    0 1px 2px rgba(17, 24, 39, 0.08),
    inset 0 1px 0 rgba(255, 255, 255, 0.6);

  --yl-input-bg: rgba(255, 255, 255, 0.32);
  --yl-input-bg-hover: rgba(255, 255, 255, 0.34);
  --yl-input-bg-focus: rgba(255, 255, 255, 0.56);
  --yl-input-bg-autofill: rgba(255, 255, 255, 0.56);
  --yl-input-border: rgba(255, 255, 255, 0.25);
  --yl-input-border-focus: rgba(255, 255, 255, 0.9);

  --yl-btn-bg: rgba(255, 255, 255, 0.38);
  --yl-btn-bg-hover: rgba(255, 255, 255, 0.46);
  --yl-btn-bg-active: rgba(255, 255, 255, 0.58);
  --yl-btn-text: var(--yl-color-primary);

  --yl-checkbox-bg: rgba(255, 255, 255, 0.35);
  --yl-checkbox-bg-hover: rgba(255, 255, 255, 0.5);
  --yl-checkbox-border: rgba(255, 255, 255, 0.4);
  --yl-checkbox-bg-checked: var(--yl-color-primary);
  --yl-checkbox-tick: var(--yl-white);
}

[data-theme="dark"] {
  --yl-color-primary: var(--yl-blue-400);
  --yl-color-primary-hover: var(--yl-blue-500);
  --yl-color-primary-active: var(--yl-blue-600);
  --yl-color-primary-soft: rgba(142, 163, 249, 0.16);
  --yl-color-text: #f3f4f6;
  --yl-color-text-secondary: #9ca3af;
  --yl-color-text-placeholder: #6b7280;
  --yl-color-border: #2a2e37;
  --yl-color-border-hover: #3a3f4b;
  --yl-color-border-focus: var(--yl-blue-400);
  --yl-color-bg-page: #0f1115;
  --yl-color-bg-container: #171a21;
  --yl-color-bg-hover: rgba(255, 255, 255, 0.06);
  --yl-color-disabled: #2a2e37;
  --yl-card-shadow: 0 4px 16px rgba(0, 0, 0, 0.4);
  --yl-glass-bg: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.14) 0%,
    rgba(255, 255, 255, 0.06) 100%
  );
  --yl-glass-border: rgba(255, 255, 255, 0.18);
  --yl-glass-highlight: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.16) 0%,
    rgba(255, 255, 255, 0.04) 30%,
    rgba(255, 255, 255, 0) 55%
  );
  --yl-glass-shadow:
    0 8px 32px rgba(0, 0, 0, 0.5),
    0 1px 2px rgba(0, 0, 0, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.12);
  --yl-input-bg: rgba(255, 255, 255, 0.08);
  --yl-input-bg-hover: rgba(255, 255, 255, 0.12);
  --yl-input-bg-focus: rgba(255, 255, 255, 0.16);
  --yl-input-bg-autofill: rgba(40, 44, 54, 1);
  --yl-input-border: rgba(255, 255, 255, 0.14);
  --yl-input-border-focus: rgba(255, 255, 255, 0.35);
  --yl-btn-bg: rgba(255, 255, 255, 0.1);
  --yl-btn-bg-hover: rgba(255, 255, 255, 0.16);
  --yl-btn-bg-active: rgba(255, 255, 255, 0.2);
  --yl-btn-text: var(--yl-blue-400);
  --yl-checkbox-bg: rgba(255, 255, 255, 0.1);
  --yl-checkbox-bg-hover: rgba(255, 255, 255, 0.16);
  --yl-checkbox-border: rgba(255, 255, 255, 0.22);
  --yl-checkbox-tick: var(--yl-white);
}

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

:where(html) {
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

:where(body) {
  margin: 0;
  font-family: var(--yl-font-sans);
  font-size: var(--yl-font-base);
  line-height: var(--yl-leading-normal);
  color: var(--yl-color-text);
  background-color: var(--yl-color-bg-page);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

:where(button, input, select, textarea) {
  font: inherit;
}

::selection {
  background-color: var(--yl-color-primary-soft);
}

:focus-visible {
  outline: 2px solid var(--yl-color-primary);
  outline-offset: 2px;
}

.yl-bg-video {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
}

.yl-bg-overlay {
  position: fixed;
  inset: 0;
  z-index: 0;
  background-color: var(--yl-overlay-bg);
  pointer-events: none;
}

.yl-login-page {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  min-height: 100dvh;
  padding: var(--yl-page-padding);
}

.yl-login-card {
  position: relative;
  width: 100%;
  max-width: var(--yl-card-max-width);
  padding: var(--yl-card-padding);
  background: var(--yl-glass-bg);
  -webkit-backdrop-filter: blur(var(--yl-glass-blur)) saturate(var(--yl-glass-saturate));
  backdrop-filter: blur(var(--yl-glass-blur)) saturate(var(--yl-glass-saturate));
  border: 1px solid var(--yl-glass-border);
  border-radius: var(--yl-radius-3);
  box-shadow: var(--yl-glass-shadow);
}

.yl-login-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: var(--yl-glass-highlight);
  pointer-events: none;
}

.yl-login-card > * {
  position: relative;
}

.yl-login-card__brand {
  margin-bottom: var(--yl-space-8);
  text-align: center;
}

.yl-brand-name {
  display: block;
  font-size: 30px;
  font-weight: 800;
  letter-spacing: 0.5px;
  line-height: 1.2;
  color: var(--yl-color-text);
}
.yl-brand-accent {
  background: linear-gradient(100deg, #ff2e93 0%, #0088ff 50%, #00f0ff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.yl-login-card__logo {
  display: block;
  width: auto;
  max-width: min(240px, 68%);
  height: auto;
  margin: 0 auto var(--yl-space-4);
}

.yl-login-card__title {
  margin: 0 0 var(--yl-space-1);
  font-size: var(--yl-font-xl);
  font-weight: 600;
  line-height: var(--yl-leading-tight);
}

.yl-login-card__subtitle {
  margin: 0;
  font-size: var(--yl-font-sm);
  color: var(--yl-color-text-secondary);
}

.yl-form {
  margin: 0;
}

.yl-form__hint {
  margin: 0 0 var(--yl-space-6);
  font-size: var(--yl-font-sm);
  color: var(--yl-color-text-secondary);
  text-align: center;
}

.yl-form__caps {
  display: block;
  margin-top: var(--yl-space-2);
  font-size: var(--yl-font-xs);
  color: var(--yl-color-text-secondary);
}

.yl-honeypot {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.yl-form__item {
  margin-bottom: var(--yl-space-4);
}

.yl-form__label {
  display: block;
  margin-bottom: var(--yl-space-2);
  font-size: var(--yl-font-sm);
  font-weight: 500;
}

.yl-input-wrap {
  position: relative;
}

.yl-input-wrap .yl-input {
  padding-right: calc(var(--yl-control-height) - var(--yl-space-2));
}

.yl-input {
  width: 100%;
  height: var(--yl-control-height);
  padding: 0 var(--yl-space-4);
  font-size: var(--yl-font-base);
  color: var(--yl-color-text);
  background-color: var(--yl-input-bg);
  border: 1px solid var(--yl-input-border);
  border-radius: var(--yl-control-radius);
  transition:
    background-color var(--yl-duration-fast) var(--yl-easing-standard),
    border-color var(--yl-duration-fast) var(--yl-easing-standard),
    box-shadow var(--yl-duration-fast) var(--yl-easing-standard);
}

.yl-input::placeholder {
  color: var(--yl-color-text-placeholder);
}

.yl-input:hover:not(:disabled):not(:focus) {
  background-color: var(--yl-input-bg-hover);
  border-color: var(--yl-color-border-hover);
}

.yl-input:focus {
  outline: none;
  background-color: var(--yl-input-bg-focus);
  border-color: var(--yl-input-border-focus);
  box-shadow: var(--yl-input-focus-ring);
}

.yl-input:disabled {
  color: var(--yl-color-text-disabled);
  background-color: var(--yl-color-disabled);
  cursor: not-allowed;
}

.yl-input--error,
.yl-input--error:hover {
  border-color: var(--yl-color-error);
}

.yl-input--error:focus {
  border-color: var(--yl-color-error);
  box-shadow: var(--yl-input-error-ring);
}

.yl-input__affix {
  position: absolute;
  top: 50%;
  right: var(--yl-space-2);
  transform: translateY(-50%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: calc(var(--yl-control-height) - var(--yl-space-2));
  height: calc(var(--yl-control-height) - var(--yl-space-2));
  padding: 0;
  color: var(--yl-color-text-secondary);
  background: transparent;
  border: none;
  border-radius: var(--yl-radius-1);
  cursor: pointer;
  transition:
    color var(--yl-duration-fast) var(--yl-easing-standard),
    background-color var(--yl-duration-fast) var(--yl-easing-standard);
}

.yl-input__affix:hover {
  color: var(--yl-color-text);
  background-color: rgba(255, 255, 255, 0.12);
}

.yl-icon {
  width: 18px;
  height: 18px;
}

.yl-icon--eye-close {
  display: none;
}

.yl-input__affix.is-active .yl-icon--eye-open {
  display: none;
}

.yl-input__affix.is-active .yl-icon--eye-close {
  display: block;
}

.yl-form__options {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--yl-space-4);
  margin-bottom: var(--yl-space-6);
  font-size: var(--yl-font-sm);
}

.yl-checkbox {
  display: inline-flex;
  align-items: center;
  gap: var(--yl-space-2);
  cursor: pointer;
  user-select: none;
}

.yl-checkbox__input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.yl-checkbox__box {
  position: relative;
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  background-color: var(--yl-checkbox-bg);
  border: 1px solid var(--yl-checkbox-border);
  border-radius: 5px;
  transition:
    background-color var(--yl-duration-fast) var(--yl-easing-standard),
    border-color var(--yl-duration-fast) var(--yl-easing-standard),
    box-shadow var(--yl-duration-fast) var(--yl-easing-standard);
}

.yl-checkbox:hover .yl-checkbox__box {
  background-color: var(--yl-checkbox-bg-hover);
}

.yl-checkbox__input:focus-visible + .yl-checkbox__box {
  box-shadow: var(--yl-input-focus-ring);
}

.yl-checkbox__tick {
  width: 12px;
  height: 12px;
  color: var(--yl-checkbox-tick);
  opacity: 0;
  transform: scale(0.6);
  transition:
    opacity var(--yl-duration-fast) var(--yl-easing-standard),
    transform var(--yl-duration-fast) var(--yl-easing-standard);
}

.yl-checkbox__input:checked + .yl-checkbox__box {
  background-color: var(--yl-checkbox-bg-checked);
  border-color: var(--yl-checkbox-bg-checked);
}

.yl-checkbox__input:checked + .yl-checkbox__box .yl-checkbox__tick {
  opacity: 1;
  transform: scale(1);
}

.yl-checkbox__text {
  font-size: var(--yl-font-sm);
}

.yl-form__footer {
  margin: var(--yl-space-6) 0 0;
  font-size: var(--yl-font-sm);
  color: var(--yl-color-text-secondary);
  text-align: center;
}

.yl-link {
  padding-bottom: 2px;
  color: var(--yl-color-text-secondary);
  text-decoration: none;
  background-image: linear-gradient(currentColor, currentColor);
  background-repeat: no-repeat;
  background-position: 0 100%;
  background-size: 0% 1px;
  transition:
    color var(--yl-duration-fast) var(--yl-easing-standard),
    background-size var(--yl-duration-base) var(--yl-easing-standard);
}

.yl-link:hover {
  color: var(--yl-color-primary-hover);
  background-size: 100% 1px;
}

.yl-btn {
  position: relative;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: var(--yl-control-height-lg);
  padding: 0 var(--yl-space-6);
  font-size: var(--yl-font-base);
  font-weight: 500;
  font-family: inherit;
  color: var(--yl-btn-text);
  background-color: var(--yl-btn-bg);
  border: 1px solid var(--yl-glass-border);
  border-radius: var(--yl-control-radius);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.4),
    0 2px 8px rgba(17, 24, 39, 0.08);
  cursor: pointer;
  transition:
    background-color var(--yl-duration-fast) var(--yl-easing-standard),
    box-shadow var(--yl-duration-fast) var(--yl-easing-standard);
}

.yl-btn:hover {
  background-color: var(--yl-btn-bg-hover);
}

.yl-btn:active {
  background-color: var(--yl-btn-bg-active);
  box-shadow:
    inset 0 2px 6px rgba(0, 0, 0, 0.08),
    0 1px 2px rgba(17, 24, 39, 0.06);
}

.yl-btn:disabled {
  color: var(--yl-color-text-disabled);
  background-color: var(--yl-color-disabled);
  cursor: not-allowed;
}

.yl-btn--block {
  display: flex;
  width: 100%;
}

.yl-divider {
  display: flex;
  align-items: center;
  gap: var(--yl-space-4);
  margin: var(--yl-space-8) 0 var(--yl-space-4);
  font-size: var(--yl-font-xs);
  color: var(--yl-color-text-secondary);
}

.yl-divider::before,
.yl-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background-color: var(--yl-glass-border);
}

.yl-thirdparty {
  display: flex;
  justify-content: center;
  gap: var(--yl-space-4);
}

.yl-thirdparty__btn {
  position: relative;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  gap: var(--yl-space-2);
  padding: var(--yl-space-2) var(--yl-space-4);
  font-size: var(--yl-font-sm);
  font-family: inherit;
  color: var(--yl-color-text);
  background-color: var(--yl-input-bg);
  border: 1px solid var(--yl-input-border);
  border-radius: var(--yl-control-radius);
  cursor: pointer;
  transition:
    background-color var(--yl-duration-fast) var(--yl-easing-standard),
    border-color var(--yl-duration-fast) var(--yl-easing-standard),
    color var(--yl-duration-fast) var(--yl-easing-standard);
}

.yl-thirdparty__icon {
  width: 16px;
  height: 16px;
}

.yl-thirdparty__btn:hover {
  background-color: var(--yl-input-bg-hover);
  border-color: var(--yl-color-primary);
  color: var(--yl-color-primary);
}

.yl-login-page__footer {
  margin-top: var(--yl-space-6);
  font-size: var(--yl-font-xs);
  color: var(--yl-color-text-secondary);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.35);
}

.yl-cursor-glow {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 520px;
  height: 520px;
  margin: -260px 0 0 -260px;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(147, 197, 253, 0.16) 0%,
    rgba(192, 132, 252, 0.05) 42%,
    transparent 68%
  );
  mix-blend-mode: screen;
  pointer-events: none;
  z-index: 0;
  animation: yl-hue-drift 16s linear infinite;
  will-change: transform;
}

.yl-mouse .yl-cursor-glow {
  display: block;
}

@keyframes yl-hue-drift {
  from { filter: hue-rotate(0deg); }
  to   { filter: hue-rotate(360deg); }
}

.yl-login-card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(
    circle at var(--yl-glare-x, 50%) var(--yl-glare-y, 0%),
    rgba(255, 255, 255, 0.28),
    rgba(255, 255, 255, 0) 52%
  );
  opacity: 0;
  transition: opacity var(--yl-duration-base) var(--yl-easing-standard);
  pointer-events: none;
}

.yl-login-card.is-glowing::after {
  opacity: 1;
}

.yl-mouse .yl-login-card {
  will-change: transform;
}

.yl-ripple {
  position: absolute;
  border-radius: 50%;
  transform: scale(0);
  background: color-mix(in srgb, var(--yl-color-primary) 22%, transparent);
  pointer-events: none;
  animation: yl-ripple var(--yl-duration-slow) var(--yl-easing-standard) forwards;
}

@keyframes yl-ripple {
  to {
    transform: scale(1);
    opacity: 0;
  }
}

.yl-btn--block::after {
  content: "";
  position: absolute;
  top: -10%;
  left: -75%;
  width: 55%;
  height: 120%;
  background: linear-gradient(
    105deg,
    transparent,
    rgba(255, 255, 255, 0.32),
    transparent
  );
  transform: skewX(-18deg);
  transition: left var(--yl-duration-slow) var(--yl-easing-standard);
  pointer-events: none;
}

.yl-btn--block:hover::after {
  left: 130%;
}

.yl-btn--block:hover {
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.4),
    0 0 24px rgba(37, 99, 235, 0.28),
    0 2px 8px rgba(17, 24, 39, 0.08);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.4),
    0 0 24px color-mix(in srgb, var(--yl-color-primary) 42%, transparent),
    0 2px 8px rgba(17, 24, 39, 0.08);
}

@keyframes yl-cinema {
  from { transform: scale(1.07); }
  to   { transform: scale(1); }
}

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

.yl-bg-video {
  animation: yl-cinema 2.4s var(--yl-easing-standard) backwards;
}

.yl-login-card {
  animation: yl-rise 700ms cubic-bezier(0.22, 1, 0.36, 1) backwards;
}

.yl-login-card > * {
  animation: yl-rise 600ms cubic-bezier(0.22, 1, 0.36, 1) backwards;
}

.yl-login-card > *:nth-child(1) { animation-delay: 70ms; }
.yl-login-card > *:nth-child(2) { animation-delay: 140ms; }
.yl-login-card > *:nth-child(3) { animation-delay: 210ms; }
.yl-login-card > *:nth-child(4) { animation-delay: 280ms; }
.yl-login-card > *:nth-child(5) { animation-delay: 350ms; }

.yl-login-page__footer {
  animation: yl-rise 600ms cubic-bezier(0.22, 1, 0.36, 1) 420ms backwards;
}

.yl-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.yl-theme-toggle {
  position: fixed;
  top: var(--yl-space-4);
  right: var(--yl-space-4);
  z-index: 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  color: var(--yl-color-text);
  background-color: var(--yl-input-bg);
  border: 1px solid var(--yl-glass-border);
  border-radius: 50%;
  cursor: pointer;
  -webkit-backdrop-filter: blur(8px) saturate(160%);
  backdrop-filter: blur(8px) saturate(160%);
  transition:
    background-color var(--yl-duration-fast) var(--yl-easing-standard),
    transform var(--yl-duration-fast) var(--yl-easing-standard),
    box-shadow var(--yl-duration-fast) var(--yl-easing-standard);
}

.yl-theme-toggle:hover {
  background-color: var(--yl-input-bg-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(17, 24, 39, 0.2);
}

.yl-theme-toggle svg {
  width: 18px;
  height: 18px;
}

.yl-icon--moon { display: block; }
.yl-icon--sun  { display: none; }

[data-theme="dark"] .yl-icon--moon { display: none; }
[data-theme="dark"] .yl-icon--sun  { display: block; }

.yl-form__error {
  margin-top: var(--yl-space-2);
  font-size: var(--yl-font-xs);
  color: var(--yl-color-error);
  animation: yl-drop 240ms var(--yl-easing-standard) both;
}

@keyframes yl-drop {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.yl-input--error {
  border-color: var(--yl-color-error);
  box-shadow: 0 0 0 3px var(--yl-color-error-soft);
}

.yl-input--error:hover {
  border-color: var(--yl-color-error);
}

.yl-checkbox.is-error .yl-checkbox__box {
  border-color: var(--yl-color-error);
  box-shadow: 0 0 0 3px var(--yl-color-error-soft);
}

.yl-login-card.is-shaking {
  animation: yl-shake 480ms var(--yl-easing-standard);
}

@keyframes yl-shake {
  10%, 90% { transform: translateX(-1px); }
  20%, 80% { transform: translateX(2px); }
  30%, 50%, 70% { transform: translateX(-4px); }
  40%, 60% { transform: translateX(4px); }
}

.yl-toast-region {
  position: fixed;
  top: var(--yl-space-6);
  left: 50%;
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--yl-space-2);
  transform: translateX(-50%);
  pointer-events: none;
}

.yl-toast {
  display: flex;
  align-items: center;
  gap: var(--yl-space-2);
  max-width: min(420px, calc(100vw - var(--yl-space-8)));
  padding: var(--yl-space-3) var(--yl-space-4);
  font-size: var(--yl-font-sm);
  color: var(--yl-color-text);
  background: var(--yl-glass-bg);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  backdrop-filter: blur(12px) saturate(180%);
  border: 1px solid var(--yl-glass-border);
  border-radius: var(--yl-radius-2);
  box-shadow: var(--yl-glass-shadow);
  animation: yl-toast-in 320ms var(--yl-easing-spring) both;
  pointer-events: auto;
}

.yl-toast::before {
  content: "";
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--yl-color-success);
}

.yl-toast--error::before {
  background-color: var(--yl-color-error);
}

.yl-toast.is-leaving {
  animation: yl-toast-out 280ms var(--yl-easing-standard) both;
}

@keyframes yl-toast-in {
  from {
    opacity: 0;
    transform: translateY(-16px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes yl-toast-out {
  to {
    opacity: 0;
    transform: translateY(-10px) scale(0.97);
  }
}

.yl-btn {
  gap: var(--yl-space-2);
}

.yl-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: 50%;
  animation: yl-spin 700ms linear infinite;
}

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

.yl-btn.is-loading {
  pointer-events: none;
  opacity: 0.9;
}

.yl-btn--block.is-loading::after {
  display: none;
}

@media (max-width: 480px) {
  :root {
    --yl-card-padding: var(--yl-space-6);
    --yl-page-padding: var(--yl-space-4);
  }

  .yl-login-card {
    border-radius: var(--yl-radius-2);
  }

  .yl-thirdparty {
    flex-wrap: wrap;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

/* 移动端输入框 16px：防止 iOS 聚焦放大 */
@media (max-width: 700px) {
  .yl-input { font-size: 16px; }
}