/**
 * Cinematic Page Transitions
 * Smooth, performant page transitions with multiple effects
 */

/* Page transition overlay */
.page-transition {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 9999;
  pointer-events: none;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
}

.page-transition__panel {
  background: var(--color-background);
  transform: translateY(-100%);
  transition: transform 0.8s cubic-bezier(0.77, 0, 0.175, 1);
}

.page-transition--active .page-transition__panel {
  transform: translateY(0);
}

.page-transition--active .page-transition__panel:nth-child(1) {
  transition-delay: 0s;
}

.page-transition--active .page-transition__panel:nth-child(2) {
  transition-delay: 0.05s;
}

.page-transition--active .page-transition__panel:nth-child(3) {
  transition-delay: 0.1s;
}

.page-transition--active .page-transition__panel:nth-child(4) {
  transition-delay: 0.15s;
}

.page-transition--active .page-transition__panel:nth-child(5) {
  transition-delay: 0.2s;
}

.page-transition--leaving .page-transition__panel {
  transform: translateY(100%);
}

/* Alternative: Curtain effect */
.page-transition--curtain {
  grid-template-columns: 1fr;
}

.page-transition--curtain .page-transition__panel {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-purple) 100%);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.8s cubic-bezier(0.77, 0, 0.175, 1);
}

.page-transition--curtain.page-transition--active .page-transition__panel {
  transform: scaleX(1);
}

.page-transition--curtain.page-transition--leaving .page-transition__panel {
  transform-origin: right;
  transform: scaleX(0);
}

/* Alternative: Circle expand */
.page-transition--circle {
  grid-template-columns: 1fr;
  background: transparent;
}

.page-transition--circle .page-transition__panel {
  background: radial-gradient(circle, var(--color-background) 0%, var(--color-background-alt) 100%);
  clip-path: circle(0% at 50% 50%);
  transform: none;
  transition: clip-path 0.8s cubic-bezier(0.77, 0, 0.175, 1);
}

.page-transition--circle.page-transition--active .page-transition__panel {
  clip-path: circle(150% at 50% 50%);
}

.page-transition--circle.page-transition--leaving .page-transition__panel {
  clip-path: circle(0% at 50% 50%);
}

/* Page content fade during transition */
body.transitioning {
  overflow: hidden;
}

body.transitioning main {
  opacity: 0.3;
  filter: blur(10px);
  transition: opacity 0.4s ease, filter 0.4s ease;
}

/* Smooth scroll behavior */
@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }

  /* Enhanced smooth scrolling for anchor links */
  html:focus-within {
    scroll-behavior: smooth;
  }
}

/* Section transitions on scroll - subtle and smooth */
@keyframes section-reveal {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.section-reveal {
  opacity: 0;
  animation: section-reveal 1.2s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.section-reveal:nth-of-type(1) { animation-delay: 0.05s; }
.section-reveal:nth-of-type(2) { animation-delay: 0.1s; }
.section-reveal:nth-of-type(3) { animation-delay: 0.15s; }
.section-reveal:nth-of-type(4) { animation-delay: 0.2s; }
.section-reveal:nth-of-type(5) { animation-delay: 0.25s; }

/* Navigation link active state during transitions */
nav a.transitioning-link {
  opacity: 0.5;
  pointer-events: none;
}

/* Loading state for async transitions */
.async-loading::after {
  content: '';
  position: fixed;
  top: 50%;
  left: 50%;
  width: 50px;
  height: 50px;
  margin: -25px 0 0 -25px;
  border: 3px solid rgba(96, 165, 250, 0.2);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  z-index: 10000;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Disable transitions for reduced motion */
@media (prefers-reduced-motion: reduce) {
  .page-transition__panel,
  .page-transition--curtain .page-transition__panel,
  .page-transition--circle .page-transition__panel {
    transition: none !important;
    animation: none !important;
  }

  body.transitioning main {
    opacity: 1;
    filter: none;
    transition: none;
  }

  .section-reveal {
    opacity: 1;
    animation: none;
  }
}

/* Hero entrance animation (initial page load) */
@keyframes hero-entrance {
  0% {
    opacity: 0;
    transform: translateY(40px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

header.site-hero {
  animation: hero-entrance 1.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@media (prefers-reduced-motion: reduce) {
  header.site-hero {
    animation: none;
  }
}

/* Staggered content reveal on page load */
.hero-content > * {
  opacity: 0;
  animation: fadeIn 0.8s ease-out forwards;
}

.hero-badge {
  animation-delay: 0.2s;
}

.hero-content h1 {
  animation-delay: 0.4s;
}

.hero-content .hero-tagline {
  animation-delay: 0.6s;
}

.hero-content .hero-description {
  animation-delay: 0.8s;
}

.hero-social {
  animation-delay: 1s;
}

.hero-stats {
  animation-delay: 1.2s;
}

@media (prefers-reduced-motion: reduce) {
  .hero-content > * {
    opacity: 1;
    animation: none;
  }
}