/* 登录页：白底卡片 + 蓝色文字，避免浅字叠白底看不见 */
:root {
  --auth-blue: #1d4ed8;
  --auth-blue-mid: #2563eb;
  --auth-blue-soft: #3b82f6;
  --auth-blue-muted: #1e40af;
  --auth-blue-faint: #60a5fa;
  --auth-card-bg: #ffffff;
  --auth-page-bg1: #eff6ff;
  --auth-page-bg2: #dbeafe;
  --auth-border: rgba(37, 99, 235, 0.22);
}

body.login-page {
  background: linear-gradient(160deg, var(--auth-page-bg1), var(--auth-page-bg2));
  color: var(--auth-blue-muted);
  min-height: 100vh;
}

.login-box {
  width: min(420px, calc(100vw - 28px));
}

.login-box .card {
  background: var(--auth-card-bg);
  border: 1px solid var(--auth-border);
  box-shadow: 0 12px 40px rgba(37, 99, 235, 0.12);
  border-radius: 16px;
  color: var(--auth-blue-muted);
}

.login-logo {
  font-weight: 800;
  letter-spacing: 0.5px;
  color: var(--auth-blue);
  text-shadow: none;
}

.login-logo small {
  display: block;
  font-weight: 600;
  letter-spacing: 0.2px;
  color: var(--auth-blue-soft);
  font-size: 12px;
  margin-top: 6px;
}

.login-card-body {
  background: var(--auth-card-bg);
  border: none;
  border-radius: 16px;
  box-shadow: none;
  backdrop-filter: none;
  color: var(--auth-blue-muted);
}

.login-box-msg {
  color: var(--auth-blue-soft) !important;
}

.login-box .text-muted {
  color: var(--auth-blue-soft) !important;
}

.input-group .form-control {
  background: #f8fafc;
  border: 1px solid var(--auth-border);
  color: var(--auth-blue-muted);
}

.input-group .form-control::placeholder {
  color: var(--auth-blue-faint);
}

.input-group .input-group-text {
  background: #eff6ff;
  border: 1px solid var(--auth-border);
  color: var(--auth-blue);
}

.input-group .form-control:focus {
  border-color: var(--auth-blue-mid);
  box-shadow: 0 0 0 0.15rem rgba(37, 99, 235, 0.2);
  color: var(--auth-blue);
}

.btn.btn-primary {
  border: none;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--auth-blue-mid), var(--auth-blue));
  color: #fff !important;
}

.btn.btn-primary:hover {
  background: linear-gradient(135deg, var(--auth-blue-soft), var(--auth-blue-mid));
  color: #fff !important;
}

.btn.btn-success {
  color: #fff !important;
}

.login-footer-note {
  margin-top: 12px;
  text-align: center;
  color: var(--auth-blue-soft);
  font-size: 12px;
}

.login-footer-note i {
  color: var(--auth-blue-mid) !important;
}

.login-box .alert-warning {
  color: #92400e;
  border-color: rgba(245, 158, 11, 0.35);
}

.login-captcha-field[hidden] {
  display: none !important;
}

.login-captcha-row {
  display: flex;
  align-items: stretch;
  gap: 10px;
}

.login-captcha-input {
  flex: 1 1 auto;
  min-width: 0;
}

.login-captcha-input .form-control,
.login-captcha-input .input-group-text {
  height: 42px;
}

.login-captcha-refresh {
  position: relative;
  flex: 0 0 142px;
  width: 142px;
  height: 42px;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--auth-border);
  border-radius: 4px;
  background: #f8fafc;
  color: var(--auth-blue-mid);
  cursor: pointer;
}

.login-captcha-refresh:focus {
  outline: 0;
  border-color: var(--auth-blue-mid);
  box-shadow: 0 0 0 0.15rem rgba(37, 99, 235, 0.2);
}

.login-captcha-refresh img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: fill;
}

.login-captcha-refresh.is-loading img {
  opacity: 0;
}

.login-captcha-retry {
  display: none;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  font-size: 13px;
  font-weight: 600;
}

.login-captcha-refresh.is-error img {
  display: none;
}

.login-captcha-refresh.is-error .login-captcha-retry {
  display: flex;
}

.login-captcha-refresh.is-loading::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 18px;
  height: 18px;
  margin: -9px 0 0 -9px;
  border: 2px solid rgba(37, 99, 235, 0.2);
  border-top-color: var(--auth-blue-mid);
  border-radius: 50%;
  animation: login-captcha-spin 0.75s linear infinite;
}

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

@media (max-width: 380px) {
  .login-captcha-row {
    gap: 8px;
  }

  .login-captcha-refresh {
    flex-basis: 120px;
    width: 120px;
  }
}