/* ============================================
   DentaCare v4 — Login Screen
   ============================================ */

.dc-login {
  position: fixed;
  inset: 0;
  background: linear-gradient(135deg, #F8FAFB 0%, #ECFEFF 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--dc-space-5);
  z-index: 100;
}

.dc-login-decoration {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.dc-login-decoration::before,
.dc-login-decoration::after {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
}

.dc-login-decoration::before {
  background: var(--dc-brand-200);
  top: -200px;
  right: -200px;
}

.dc-login-decoration::after {
  background: var(--dc-brand-100);
  bottom: -200px;
  left: -200px;
}

.dc-login-container {
  position: relative;
  width: 100%;
  max-width: 420px;
  background: var(--dc-bg-surface);
  border-radius: var(--dc-radius-xl);
  box-shadow: var(--dc-shadow-xl);
  padding: var(--dc-space-8) var(--dc-space-6);
}

.dc-login-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--dc-space-3);
  margin-bottom: var(--dc-space-6);
}

.dc-login-logo {
  width: 56px;
  height: 56px;
  background: var(--dc-brand-600);
  border-radius: var(--dc-radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--dc-text-inverse);
  box-shadow: 0 8px 24px -8px rgba(8, 145, 178, 0.5);
}

.dc-login-logo svg {
  width: 30px;
  height: 30px;
}

.dc-login-title {
  font-size: var(--dc-text-2xl);
  font-weight: var(--dc-weight-semibold);
  color: var(--dc-text-primary);
}

.dc-login-subtitle {
  font-size: var(--dc-text-sm);
  color: var(--dc-text-secondary);
  text-align: center;
}

.dc-login-form {
  display: flex;
  flex-direction: column;
  gap: var(--dc-space-3);
}

.dc-login-field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.dc-login-error {
  display: none;
  padding: 10px 12px;
  background: var(--dc-danger-50);
  border: 1px solid var(--dc-danger-100);
  border-radius: var(--dc-radius-md);
  font-size: var(--dc-text-sm);
  color: var(--dc-danger-700);
}

.dc-login-error.is-visible {
  display: block;
  animation: dc-shake 320ms ease-in-out;
}

@keyframes dc-shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-4px); }
  40%, 80% { transform: translateX(4px); }
}

.dc-login-submit {
  margin-top: var(--dc-space-2);
  width: 100%;
  padding: 11px;
  font-size: var(--dc-text-md);
  font-weight: var(--dc-weight-medium);
  background: var(--dc-brand-600);
  color: var(--dc-text-inverse);
  border: none;
  border-radius: var(--dc-radius-md);
  cursor: pointer;
  transition: background var(--dc-transition-fast);
}

.dc-login-submit:hover:not(:disabled) {
  background: var(--dc-brand-700);
}

.dc-login-submit:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.dc-login-hint {
  margin-top: var(--dc-space-5);
  padding: var(--dc-space-3);
  background: var(--dc-brand-50);
  border-radius: var(--dc-radius-md);
  font-size: var(--dc-text-xs);
  color: var(--dc-brand-700);
  line-height: var(--dc-leading-relaxed);
}

.dc-login-hint-title {
  font-weight: var(--dc-weight-semibold);
  margin-bottom: 4px;
}

.dc-login-hint-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-family: var(--dc-font-mono);
  font-size: 11px;
}

.dc-login-footer {
  margin-top: var(--dc-space-5);
  text-align: center;
  font-size: var(--dc-text-xs);
  color: var(--dc-text-tertiary);
}