* , *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }
html { font-size: 16px; scroll-behavior: smooth; height: 100%; }
body {
  min-height: 100%;
  font-family: "Inter", "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background-color: var(--bg-surface, #F3F4F6);
  color: var(--text-main, #111827);
  line-height: 1.5;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 16px;
  overflow-x: hidden;
}
.checkout-container { width: 100%; max-width: 480px; margin: auto; }
img, svg { display: block; max-width: 100%; }
button { font-family: inherit; border: none; background: none; cursor: pointer; outline: none; }
input, select { font-family: inherit; font-size: inherit; border: none; outline: none; }
fieldset { border: none; }
.hidden { display: none !important; }
.toast-container {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; gap: 8px; z-index: 9999;
  width: calc(100% - 32px); max-width: 420px; pointer-events: none;
}
.toast {
  pointer-events: auto; background: var(--bg-card, #FFF); color: var(--text-main, #111827);
  border: 1px solid var(--border-color, #E5E7EB); padding: 12px 16px; border-radius: 10px;
  font-size: 0.875rem; font-weight: 500; box-shadow: 0 10px 25px -5px rgba(0,0,0,0.15);
  animation: toastSlideUp 0.25s ease-out forwards;
}
@keyframes toastSlideUp { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }