/* ===== 现代简约登录页 ===== */
:root {
  --mi-primary: #3b82f6;
  --mi-primary-600: #2563eb;
  --mi-primary-rgb: 59, 130, 246;
  --mi-ink: #111827;
  --mi-body: #6b7280;
  --mi-border: #e8eaee;
  --mi-font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto,
             "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
}

body {
  font-family: var(--mi-font);
  background: linear-gradient(160deg, #f7f8fa 0%, #eef1f6 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  padding: 1rem;
  -webkit-font-smoothing: antialiased;
}

.login-card {
  width: 100%;
  max-width: 400px;
  background: #ffffff;
  border-radius: 0.875rem;
  border: 1px solid var(--mi-border);
  box-shadow: 0 1px 3px rgba(16, 24, 40, .06), 0 8px 28px rgba(16, 24, 40, .08);
  overflow: hidden;
}

.login-card-header {
  padding: 2.25rem 2rem 1.75rem;
  text-align: center;
}

.login-card-header .login-logo {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  box-shadow: 0 2px 8px rgba(59, 130, 246, .3);
  margin-bottom: 1rem;
}

.login-card-header h1 {
  font-size: 1.3125rem;
  font-weight: 700;
  color: var(--mi-ink);
  letter-spacing: -.01em;
  margin: 0;
}

.login-card-header p {
  margin: .375rem 0 0;
  color: var(--mi-body);
  font-size: .875rem;
}

.login-card-body {
  padding: 1.25rem 2rem 2rem;
}

.form-label {
  font-weight: 500;
  color: #4b5563;
  font-size: .875rem;
  margin-bottom: .375rem;
}

.form-control {
  border-radius: .5rem;
  border-color: var(--mi-border);
  padding: .625rem .875rem;
  font-size: .9375rem;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.form-control:focus {
  border-color: var(--mi-primary);
  box-shadow: 0 0 0 .25rem rgba(var(--mi-primary-rgb), .1);
}

.btn-primary {
  background-color: var(--mi-primary);
  border-color: var(--mi-primary);
  border-radius: .5rem;
  font-weight: 500;
  padding: .625rem 1rem;
  box-shadow: 0 1px 2px rgba(var(--mi-primary-rgb), .25);
  transition: all .15s ease;
}
.btn-primary:hover {
  background-color: var(--mi-primary-600);
  border-color: var(--mi-primary-600);
  box-shadow: 0 2px 6px rgba(var(--mi-primary-rgb), .35);
}

.login-footer {
  text-align: center;
  padding: 1rem 2rem;
  border-top: 1px solid var(--mi-border);
  color: var(--mi-muted, #9ca3af);
  font-size: .8125rem;
}

.alert {
  border-radius: .5rem;
}