body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: linear-gradient(135deg, #a8e0ff, #8ec5fc, #e0c3fc);
  color: #333;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  animation: fadeIn 1.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

header {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid rgba(255,255,255,0.4);
  padding: 1.5rem 2rem;
  text-align: center;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

header h1 {
  margin: 0;
  font-size: 2rem;
  color: #444;
  letter-spacing: 1px;
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 2rem;
  gap: 1.5rem;
}

main a {
  width: 90%;
  max-width: 480px;
  padding: 1.1rem 1.5rem;
  border-radius: 12px;
  background: linear-gradient(135deg, #6a85ff, #8f6aff);
  color: #fff;
  text-decoration: none;
  text-align: center;
  font-size: 1.2rem;
  font-weight: bold;
  box-shadow: 0 6px 12px rgba(0,0,0,0.15);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

main a:hover {
  transform: translateY(-4px) scale(1.03);
  box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

footer {
  color: #fff;
  text-shadow: 0 1px 2px rgba(0,0,0,0.2);
  text-align: center;
  padding: 1.5rem;
  font-size: 0.95rem;
}



.popup-button {
  margin-top: 1rem;
  padding: 0.8rem 1.2rem;
  font-size: 1rem;
  font-weight: bold;
  border: none;
  border-radius: 10px;
  background: #ff9f43;
  color: #fff;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(0,0,0,0.15);
  transition: 0.2s;
}

.popup-button:hover {
  transform: translateY(-3px);
}


.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  display: none;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

.overlay.active {
  display: flex;
}

.popup {
  background: #fff;
  max-width: 420px;
  width: 90%;
  padding: 1.8rem;
  border-radius: 14px;
  box-shadow: 0 10px 28px rgba(0,0,0,0.25);
  animation: popupFade 0.25s ease;
}

.popup h2 {
  margin-top: 0;
  margin-bottom: 1rem;
  font-size: 1.4rem;
  color: #444;
}

.popup p {
  line-height: 1.6;
  margin-bottom: 1.4rem;
}

.close-button {
  background: #6a85ff;
  color: #fff;
  padding: 0.7rem 1.2rem;
  border: none;
  border-radius: 10px;
  font-size: 1rem;
  cursor: pointer;
  font-weight: bold;
}

.info-box-static {
  width: 90%;
  max-width: 600px;
  padding: 1.4rem 1.6rem;
  background: rgba(255, 255, 255, 0.9);
  border-radius: 14px;
  box-shadow: 0 6px 14px rgba(0,0,0,0.18);
  backdrop-filter: blur(6px);
  animation: fadeIn 0.8s ease;
  line-height: 1.6;
}

.info-box-static h2 {
  margin-top: 0;
  font-size: 1.4rem;
  color: #333;
}

.info-box-static p {
  margin: 0.6rem 0;
  font-size: 1rem;
  color: #444;
}

.info-box-static code {
  background: #efefef;
  padding: 2px 4px;
  border-radius: 6px;
  font-size: 0.9em;
}

@keyframes popupFade {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}