:root {
  --zimx-primary: #0078ff;
  --zimx-success: #22c55e;
  --zimx-error: #ef4444;
  --zimx-neutral: #64748b;
  --zimx-text: #0f172a;
  --zimx-border: #e2e8f0;
  --zimx-surface: #ffffff;
  --zimx-bg: #f8fafc;
  --zimx-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  --zimx-transition: 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  color: var(--zimx-text);
  background: linear-gradient(180deg, #f8fbff 0%, #eef4ff 100%);
}

.login-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.auth-overlay {
  display: none;
  width: min(100%, 460px);
}

.auth-overlay.active {
  display: block;
}

.auth-card {
  border: 1px solid var(--zimx-border);
  background: var(--zimx-surface);
  border-radius: 16px;
  box-shadow: var(--zimx-shadow);
  padding: 28px;
}

.brand {
  margin-bottom: 16px;
}

.brand h1 {
  margin: 0;
  font-size: 1.375rem;
}

.brand p {
  margin: 6px 0 0;
  color: var(--zimx-neutral);
  font-size: 0.9375rem;
}

.field {
  margin-bottom: 14px;
}

.field label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.875rem;
  font-weight: 600;
}

.field input {
  width: 100%;
  border: 1px solid var(--zimx-border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 0.95rem;
  transition: border-color var(--zimx-transition), box-shadow var(--zimx-transition);
}

.field input:focus-visible {
  border-color: var(--zimx-primary);
  box-shadow: 0 0 0 3px rgba(0, 120, 255, 0.2);
  outline: none;
}

.inline-option {
  margin: 4px 0 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--zimx-neutral);
  font-size: 0.875rem;
}

button.primary,
button.secondary {
  width: 100%;
  border: 0;
  border-radius: 10px;
  padding: 11px 14px;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--zimx-transition), box-shadow var(--zimx-transition), opacity var(--zimx-transition);
}

button.primary {
  color: #fff;
  background: var(--zimx-primary);
}

button.secondary {
  margin-top: 8px;
  color: var(--zimx-primary);
  background: rgba(0, 120, 255, 0.08);
}

button:disabled {
  opacity: 0.65;
  cursor: wait;
}

button:not(:disabled):hover {
  transform: translateY(-1px);
  box-shadow: var(--zimx-shadow);
}

.state-text {
  margin: 12px 0 0;
  font-size: 0.875rem;
  min-height: 20px;
}

.state-text.error {
  color: var(--zimx-error);
}

.state-text.success {
  color: var(--zimx-success);
  display: grid;
  gap: 2px;
}

.progress-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 6px;
  font-size: 0.875rem;
}

.progress-list li {
  display: flex;
  justify-content: space-between;
  border: 1px solid var(--zimx-border);
  border-radius: 8px;
  padding: 8px 10px;
  color: var(--zimx-neutral);
}

.btn-spinner {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.5);
  border-top-color: #fff;
  display: inline-block;
  margin-right: 8px;
  animation: spin 0.75s linear infinite;
  vertical-align: middle;
}

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

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

@media (max-width: 520px) {
  .login-shell {
    padding: 16px;
  }

  .auth-card {
    padding: 20px;
    border-radius: 14px;
  }
}