:root {
  --teal-50: #f0f9f8;
  --teal-100: #d1f0ee;
  --teal-300: #7accc6;
  --teal-500: #1a9a8e;
  --teal-600: #0f7a70;
  --teal-700: #0a5c54;

  --white: #ffffff;
  --gray-800: #1a2027;
  --gray-500: #6b7280;

  --shadow-lg: 0 20px 40px rgba(0,0,0,0.12);
  --radius-lg: 16px;

  --transition: all 0.3s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: linear-gradient(135deg, var(--teal-50), var(--teal-300));
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Page */
.page {
  width: 100%;
  padding: 1rem;
}

/* Card */
.card {
  max-width: 520px;
  margin: auto;
  padding: 2.5rem;
  text-align: center;

  background: rgba(255,255,255,0.75);
  backdrop-filter: blur(12px);

  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

/* Logo */
.logo img {
  width: 56px;
  height: 56px;
  margin-bottom: 1rem;
}

/* Label */
.label {
  font-size: 0.8rem;
  color: var(--teal-600);
  font-weight: 600;
  margin-bottom: 0.75rem;
}

/* Title */
h1 {
  font-size: 2.3rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

/* Subtitle */
.subtitle {
  font-size: 1.1rem;
  color: var(--gray-500);
  line-height: 1.6;
  margin-bottom: 2rem;
}

/* Button */
.cta-button {
  width: 100%;
  background: var(--teal-600);
  color: white;
  border: none;
  padding: 0.9rem;
  font-size: 1.1rem;
  font-weight: 600;
  border-radius: 12px;
  cursor: pointer;
  transition: var(--transition);

  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
}

.cta-button:hover {
  background: var(--teal-700);
  transform: translateY(-2px);
}

.cta-button:active {
  transform: translateY(0);
}

.cta-button:focus {
  outline: 2px solid var(--teal-300);
}

/* Loading spinner */
.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.4);
  border-top: 2px solid white;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.hidden {
  display: none;
}

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

/* Footer */
.footer-note {
  font-size: 0.85rem;
  color: var(--gray-500);
  margin-top: 1.5rem;
}

/* Responsive */
@media (max-width: 600px) {
  .card {
    padding: 2rem;
  }

  h1 {
    font-size: 1.8rem;
  }
}