:root {
  color-scheme: light;
  --navy: #0a2540;
  --cream: #faf8f5;
  --whatsapp: #25d366;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--cream);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  min-width: 320px;
  background: var(--cream);
  color: var(--navy);
  font-family: "Noto Sans TC", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.landing-shell {
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  overflow: clip;
  background: var(--cream);
}

.image-stack,
.page-frame {
  margin: 0;
  padding: 0;
}

.page-frame {
  position: relative;
  width: 100%;
  line-height: 0;
  background: var(--cream);
}

.page-frame img {
  display: block;
  width: 100%;
  height: auto;
  margin: 0;
  padding: 0;
  border: 0;
  user-select: none;
  -webkit-user-drag: none;
}

.whatsapp-hotspot {
  position: absolute;
  z-index: 3;
  left: 7%;
  right: 7%;
  top: 84%;
  height: 8.5%;
  display: block;
  cursor: pointer;
  border-radius: 999px;
  outline: none;
  -webkit-tap-highlight-color: transparent;
}

.whatsapp-hotspot:focus-visible {
  outline: 4px solid rgba(37, 211, 102, 0.9);
  outline-offset: 4px;
}

.floating-whatsapp {
  position: fixed;
  z-index: 10;
  right: max(16px, env(safe-area-inset-right));
  bottom: max(16px, env(safe-area-inset-bottom));
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 48px;
  padding: 11px 17px;
  color: #ffffff;
  background: var(--whatsapp);
  border: 2px solid rgba(255, 255, 255, 0.9);
  border-radius: 999px;
  box-shadow: 0 10px 28px rgba(10, 37, 64, 0.24);
  font-size: 16px;
  font-weight: 800;
  line-height: 1.1;
  text-decoration: none;
  animation: whatsapp-pulse 2.4s ease-in-out infinite;
}

.floating-whatsapp__dot {
  width: 11px;
  height: 11px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: #ffffff;
  box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.8);
  animation: dot-pulse 2.4s ease-out infinite;
}

@keyframes whatsapp-pulse {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-3px); }
}

@keyframes dot-pulse {
  0% { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.8); }
  70% { box-shadow: 0 0 0 9px rgba(255, 255, 255, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0); }
}

@media (min-width: 761px) {
  .landing-shell {
    box-shadow: 0 0 46px rgba(10, 37, 64, 0.12);
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .floating-whatsapp,
  .floating-whatsapp__dot { animation: none; }
}