body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 16px;
  background: var(--surface);
}

.card {
  background: var(--canvas);
  border: 1px solid var(--hairline);
  border-radius: var(--r-xl);
  padding: 48px 40px;
  text-align: center;
  max-width: 380px;
  width: 100%;
  box-shadow: var(--shadow-card);
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -1px;
  margin-bottom: 6px;
  color: var(--ink-deep);
}

.tagline { color: var(--steel); font-size: 0.9rem; margin-bottom: 36px; }

.btn-google {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
  padding: 11px 20px;
  background: var(--canvas);
  color: var(--charcoal);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-md);
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
  font-family: inherit;
}
.btn-google:hover { background: var(--surface); border-color: var(--slate); }
.btn-google svg { width: 20px; height: 20px; flex-shrink: 0; }

.error-msg { color: var(--error); font-size: 0.875rem; margin-top: 16px; }

@media (max-width: 420px) {
  .card { padding: 36px 24px; }
  .logo { font-size: 1.5rem; }
  .tagline { margin-bottom: 28px; }
}