:root {
  color-scheme: light dark;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at top, #dbeafe 0, #eef2ff 50%, #d1d5db 100%);
  /* Figtree fallback to system fonts (CSP blocks Google Fonts) */
  font-family: "Figtree", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #0f172a;
  font-size: 18px;
}

.card {
  background: rgba(255, 255, 255, 0.95);
  border-radius: 18px;
  padding: 28px 32px;
  max-width: 520px;
  width: 90%;
  box-shadow: 0 18px 45px rgba(15, 23, 42, 0.18);
  backdrop-filter: blur(12px);
}

.title {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0 0 8px;
}

.subtitle {
  margin: 0 0 20px;
  font-size: 1rem;
  color: #4b5563;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  border: none;
  border-radius: 999px;
  padding: 0.75rem 1.9rem;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  /* Solid color fallback for older/internal browsers */
  background-color: #3b82f6;
  /* Gradient for modern browsers */
  background-image: radial-gradient(circle at 30% 20%, #bfdbfe 0, #3b82f6 40%, #1e40af 100%);
  color: #f9fafb;
  box-shadow: 0 14px 28px rgba(15, 23, 42, 0.45);
  transition: transform 0.12s ease, box-shadow 0.12s ease, background 0.12s ease;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 34px rgba(15, 23, 42, 0.55);
  background-color: #2563eb;
  background-image: radial-gradient(circle at 30% 15%, #dbeafe 0, #2563eb 40%, #1d4ed8 100%);
}

.btn:active {
  transform: translateY(0);
  box-shadow: 0 10px 20px rgba(15, 23, 42, 0.4);
}

.btn-icon {
  width: 18px;
  height: 18px;
  border-radius: 999px;
  border: 1.5px solid rgba(248, 250, 252, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
}

.note {
  margin-top: 16px;
  font-size: 0.9rem;
  color: #4b5563;
  line-height: 1.5;
}

.note strong {
  font-weight: 600;
}