html[data-theme="light"] {
  --bg-default: #f4f7fb;
  --bg-card: rgba(255,255,255,0.94);
  --border-default: #d0d7de;
  --blue: #0969da;
  --green: #1a7f37;
  --amber: #9a6700;
  --orange: #bc4c00;
  --red: #cf222e;
  --purple: #8250df;
  --text-primary: #1f2328;
  --text-secondary: #57606a;
}

html[data-theme="light"] body {
  background-image:
    radial-gradient(ellipse at 18% 28%, rgba(9,105,218,0.10) 0%, transparent 52%),
    radial-gradient(ellipse at 82% 48%, rgba(26,127,55,0.08) 0%, transparent 56%),
    linear-gradient(135deg, #f8fbff 0%, #eef4fb 100%);
}

html[data-theme="light"] body::before {
  background: radial-gradient(circle at 50% 44%, rgba(9,105,218,0.08) 0%, transparent 68%);
}

html[data-theme="light"] .auth-card {
  box-shadow: 0 18px 48px rgba(140,149,159,0.24);
  animation: cardFloatIn 0.5s ease-out;
}

html[data-theme="light"] .auth-card::before {
  background: linear-gradient(90deg, transparent, rgba(9,105,218,0.38), transparent);
}

html[data-theme="light"] .form-control,
html[data-theme="light"] .input-group .form-control {
  background: #ffffff !important;
  color: var(--text-primary) !important;
  border-color: var(--border-default) !important;
}

html[data-theme="light"] .form-control:focus,
html[data-theme="light"] .input-group .form-control:focus {
  background: #ffffff !important;
  color: var(--text-primary) !important;
}

html[data-theme="light"] .form-control::placeholder {
  color: #8c959f;
}

html[data-theme="light"] .capacity-bar {
  background: #eaeef2;
}

html[data-theme="light"] .text-secondary {
  color: var(--text-secondary) !important;
}

.auth-theme-switcher {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 20;
}

.auth-theme-button {
  width: 38px;
  height: 38px;
  border-radius: 999px;
  border: 1px solid var(--border-default);
  background: var(--bg-card);
  color: var(--text-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 28px rgba(0,0,0,0.16);
  transition: transform var(--transition), border-color var(--transition), background var(--transition);
}

.auth-theme-button:hover {
  border-color: var(--blue);
  transform: translateY(-1px);
}

.auth-theme-menu {
  position: absolute;
  top: 46px;
  right: 0;
  width: 156px;
  padding: 6px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  box-shadow: 0 18px 40px rgba(0,0,0,0.24);
  display: none;
}

.auth-theme-switcher.open .auth-theme-menu {
  display: block;
}

.auth-theme-item {
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  text-align: left;
}

.auth-theme-item:hover,
.auth-theme-item.active {
  background: rgba(88,166,255,0.12);
  color: var(--blue);
}

html[data-theme="light"] .auth-theme-button,
html[data-theme="light"] .auth-theme-menu {
  box-shadow: 0 14px 32px rgba(140,149,159,0.24);
}

@media (max-width: 440px) {
  .auth-theme-switcher {
    top: 10px;
    right: 10px;
  }
}