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

body {
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  margin: 0;
  background: #f8fafc;
  /* Prevent scroll during transition */
  overflow: hidden;
}

/* The Solid Fullscreen Overlay */
.transition-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: #0f172a;
  z-index: 9999;
  display: flex;
  justify-content: center;
  align-items: center;
  /* This cubic bezier creates the satisfying snappy wipe effect */
  transition: transform 0.8s cubic-bezier(0.76, 0, 0.24, 1);
  transform-origin: top center;
}

/* The class JS adds to trigger the wipe up */
.transition-overlay.hidden {
  transform: translateY(-100%);
}

.loader-logo {
  animation: pulse-logo 1.5s infinite alternate;
}

@keyframes pulse-logo {
  0% { transform: scale(0.9); opacity: 0.7; }
  100% { transform: scale(1.1); opacity: 1; filter: drop-shadow(0 0 10px rgba(255,255,255,0.5)); }
}

.page-content {
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 20px;
}

.page-content h1 {
  font-size: clamp(3rem, 6vw, 5rem);
  color: #0f172a;
  margin: 0 0 16px 0;
  letter-spacing: -1px;
}

.page-content p {
  font-size: 1.25rem;
  color: #64748b;
  max-width: 600px;
  margin: 0 0 32px 0;
  line-height: 1.6;
}

.primary-btn {
  background: #3b82f6;
  color: #ffffff;
  border: none;
  padding: 16px 32px;
  border-radius: 30px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
}

/* Staggered entrance animations for content */
.stagger-item {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.page-content.loaded .stagger-item {
  opacity: 1;
  transform: translateY(0);
}

.page-content.loaded .stagger-item:nth-child(1) { transition-delay: 0.4s; }
.page-content.loaded .stagger-item:nth-child(2) { transition-delay: 0.5s; }
.page-content.loaded .stagger-item:nth-child(3) { transition-delay: 0.6s; }

/* Simulate page load time for the demo */
window.addEventListener("load", function() {
  setTimeout(function() {
    const overlay = document.getElementById("transition-overlay");
    const content = document.querySelector(".page-content");
    
    /* Slide the overlay up */
    overlay.classList.add("hidden");
    
    /* Trigger the staggered content entrance */
    content.classList.add("loaded");
    
    /* Restore scrollability safely */
    document.body.style.overflow = "auto";
  }, 1500);
});