/**
 * Premium Footer & Page Transitions
 * Paul Aizpiri Catalogue Raisonné
 * Version 1.0
 */

/* ============================================
   VIEW TRANSITIONS API ENHANCEMENTS
   ============================================ */

@view-transition {
  navigation: auto;
}

/* Root transitions - smooth fade */
::view-transition-old(root) {
  animation: fadeOut 0.25s cubic-bezier(0.4, 0, 1, 1);
}

::view-transition-new(root) {
  animation: fadeIn 0.35s cubic-bezier(0, 0, 0.2, 1);
}

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

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

/* Named transitions for header (stays fixed) */
.site-header {
  view-transition-name: header;
}

::view-transition-old(header),
::view-transition-new(header) {
  animation: none;
  mix-blend-mode: normal;
}

/* Hero sections cross-fade */
.hero-section,
.hero-interior,
.hero-expositions,
.hero-market,
.hero-small {
  view-transition-name: hero;
}

::view-transition-old(hero) {
  animation: fadeOutScale 0.3s cubic-bezier(0.4, 0, 1, 1);
}

::view-transition-new(hero) {
  animation: fadeInScale 0.4s cubic-bezier(0, 0, 0.2, 1);
}

@keyframes fadeOutScale {
  from {
    opacity: 1;
    transform: scale(1);
  }
  to {
    opacity: 0;
    transform: scale(0.98);
  }
}

@keyframes fadeInScale {
  from {
    opacity: 0;
    transform: scale(1.02);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Main content slides */
main {
  view-transition-name: main-content;
}

::view-transition-old(main-content) {
  animation: slideOutLeft 0.3s cubic-bezier(0.4, 0, 1, 1);
}

::view-transition-new(main-content) {
  animation: slideInRight 0.4s cubic-bezier(0, 0, 0.2, 1);
}

@keyframes slideOutLeft {
  from {
    opacity: 1;
    transform: translateX(0);
  }
  to {
    opacity: 0;
    transform: translateX(-30px);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ============================================
   LOADING STATES & PROGRESS
   ============================================ */

/* Loading overlay */
.page-loading {
  position: fixed;
  inset: 0;
  background: var(--color-background);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 1;
  visibility: visible;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.page-loading.hidden {
  opacity: 0;
  visibility: hidden;
}

/* Logo-based spinner */
.loading-spinner {
  width: 80px;
  height: 80px;
  position: relative;
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.1);
    opacity: 0.7;
  }
}

.loading-spinner::before,
.loading-spinner::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 3px solid var(--color-accent);
  border-radius: 50%;
  animation: ripple 2s cubic-bezier(0, 0.2, 0.8, 1) infinite;
}

.loading-spinner::after {
  animation-delay: 1s;
}

@keyframes ripple {
  0% {
    transform: scale(0.8);
    opacity: 1;
  }
  100% {
    transform: scale(1.8);
    opacity: 0;
  }
}

/* Signature animation */
.loading-signature {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-style: italic;
  color: var(--color-accent);
  margin-top: var(--space-lg);
  animation: fadeInOut 2s ease-in-out infinite;
}

@keyframes fadeInOut {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

/* Progress bar */
.navigation-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-secondary), var(--color-accent));
  background-size: 200% 100%;
  animation: progressShine 1.5s linear infinite;
  z-index: calc(var(--z-scroll-progress) + 1);
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.navigation-progress.active {
  width: 100%;
}

@keyframes progressShine {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ============================================
   PAGE ENTRY ANIMATIONS
   ============================================ */

/* Staggered section reveal */
.stagger-animate {
  opacity: 0;
  transform: translateY(30px);
  animation: staggerIn 0.6s ease-out forwards;
}

.stagger-animate:nth-child(1) { animation-delay: 0.1s; }
.stagger-animate:nth-child(2) { animation-delay: 0.2s; }
.stagger-animate:nth-child(3) { animation-delay: 0.3s; }
.stagger-animate:nth-child(4) { animation-delay: 0.4s; }
.stagger-animate:nth-child(5) { animation-delay: 0.5s; }

@keyframes staggerIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Hero entrance */
.hero-section,
.hero-interior,
.hero-expositions,
.hero-market,
.hero-small {
  animation: heroEntrance 0.8s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes heroEntrance {
  from {
    opacity: 0;
    transform: scale(1.05) translateY(-20px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

/* Content sections */
[data-scroll-animate] {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

[data-scroll-animate].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  ::view-transition-old(root),
  ::view-transition-new(root),
  ::view-transition-old(hero),
  ::view-transition-new(hero),
  ::view-transition-old(main-content),
  ::view-transition-new(main-content) {
    animation: none !important;
  }

  .stagger-animate,
  [data-scroll-animate] {
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
  }

  .loading-spinner,
  .loading-signature,
  .navigation-progress {
    animation: none !important;
  }
}

/* ============================================
   PREMIUM FOOTER
   ============================================ */

.site-footer {
  position: relative;
  background: linear-gradient(to bottom, var(--color-surface) 0%, var(--color-surface-alt) 100%);
  margin-top: var(--space-4xl);
  overflow: hidden;
}

/* Animated wave decoration */
.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 120px;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-secondary) 50%, var(--color-accent) 100%);
  opacity: 0.1;
  clip-path: ellipse(100% 100% at 50% 0%);
  animation: waveShimmer 10s ease-in-out infinite;
}

@keyframes waveShimmer {
  0%, 100% { transform: translateY(0) scaleX(1); }
  50% { transform: translateY(-10px) scaleX(1.05); }
}

[data-theme="dark"] .site-footer {
  background: linear-gradient(to bottom, var(--color-surface) 0%, #0a0a15 100%);
}

/* Brush stroke decoration */
.footer-decoration {
  position: absolute;
  top: -2px;
  left: 0;
  right: 0;
  height: 80px;
  background: linear-gradient(90deg, transparent 0%, var(--color-accent) 20%, var(--color-secondary) 40%, var(--color-accent) 60%, transparent 100%);
  opacity: 0.15;
  clip-path: polygon(0 50%, 5% 30%, 10% 40%, 15% 25%, 20% 35%, 25% 20%, 30% 30%, 35% 15%, 40% 25%, 45% 10%, 50% 20%, 55% 10%, 60% 25%, 65% 15%, 70% 30%, 75% 20%, 80% 35%, 85% 25%, 90% 40%, 95% 30%, 100% 50%, 100% 100%, 0 100%);
  animation: brushStroke 15s ease-in-out infinite;
}

@keyframes brushStroke {
  0%, 100% { transform: translateX(0) scaleX(1); opacity: 0.15; }
  50% { transform: translateX(-20px) scaleX(1.1); opacity: 0.25; }
}

.footer-wrapper {
  position: relative;
  z-index: 1;
  padding: var(--space-4xl) 0 0;
}

/* Newsletter section */
.footer-newsletter {
  text-align: center;
  padding: var(--space-3xl) var(--container-padding);
  max-width: 600px;
  margin: 0 auto;
  animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.footer-newsletter h3 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

.footer-newsletter p {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  line-height: var(--leading-relaxed);
}

.newsletter-form {
  display: flex;
  gap: var(--space-md);
  max-width: 500px;
  margin: 0 auto;
}

.newsletter-form input {
  flex: 1;
  padding: var(--space-md) var(--space-lg);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius-md);
  font-size: var(--text-base);
  font-family: var(--font-body);
  background: var(--color-surface);
  color: var(--color-text-primary);
  transition: all var(--transition-fast);
}

.newsletter-form input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(196, 163, 90, 0.1);
}

.newsletter-form input::placeholder {
  color: var(--color-text-muted);
}

.newsletter-form button {
  padding: var(--space-md) var(--space-xl);
  background: var(--color-accent);
  color: var(--color-surface);
  border: none;
  border-radius: var(--border-radius-md);
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  font-family: var(--font-body);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.newsletter-form button:hover {
  background: var(--color-accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(196, 163, 90, 0.3);
}

.newsletter-form button:active {
  transform: translateY(0);
}

/* Main footer content override */
.site-footer .footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-3xl);
  padding: var(--space-3xl) var(--container-padding);
  max-width: var(--container-xl);
  margin: 0 auto;
  border-top: 1px solid var(--color-border);
}

.footer-main {
  animation: fadeInUp 0.6s ease-out 0.1s both;
}

.footer-signature {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-style: italic;
  color: var(--color-accent);
  margin-bottom: var(--space-lg);
  opacity: 0.8;
}

.footer-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-md);
}

.footer-description {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-lg);
}

.footer-contact {
  animation: fadeInUp 0.6s ease-out 0.2s both;
}

.footer-links {
  animation: fadeInUp 0.6s ease-out 0.3s both;
}

.footer-subtitle {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-lg);
  position: relative;
  padding-bottom: var(--space-sm);
}

.footer-subtitle::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 2px;
  background: var(--color-accent);
}

.site-footer .footer-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-size: var(--text-base);
  transition: all var(--transition-fast);
  display: inline-block;
  position: relative;
}

.site-footer .footer-link::before {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-accent);
  transition: width var(--transition-fast);
}

.site-footer .footer-link:hover {
  color: var(--color-accent);
  transform: translateX(4px);
}

.site-footer .footer-link:hover::before {
  width: 100%;
}

/* Social links enhanced */
.site-footer .footer-social {
  display: flex;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.site-footer .footer-social a {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--border-radius-md);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  border: 2px solid var(--color-border);
  font-size: var(--text-xl);
  text-decoration: none;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.site-footer .footer-social a::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--color-accent);
  transform: translateY(100%);
  transition: transform var(--transition-fast);
  z-index: 0;
}

.site-footer .footer-social a svg,
.site-footer .footer-social a span {
  position: relative;
  z-index: 1;
}

.site-footer .footer-social a:hover {
  border-color: var(--color-accent);
  color: var(--color-surface);
  transform: translateY(-4px);
  box-shadow: 0 6px 20px rgba(196, 163, 90, 0.3);
}

.site-footer .footer-social a:hover::before {
  transform: translateY(0);
}

/* Bottom footer enhanced */
.site-footer .footer-bottom {
  border-top: 1px solid var(--color-border);
  padding: var(--space-xl) var(--container-padding);
  text-align: center;
  animation: fadeInUp 0.6s ease-out 0.5s both;
}

.footer-copyright {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  line-height: var(--leading-relaxed);
}

.footer-legal {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.footer-link-small {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-link-small:hover {
  color: var(--color-accent);
}

/* Back to top button enhanced */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 56px;
  height: 56px;
  border-radius: var(--border-radius-full);
  background: var(--color-accent);
  color: var(--color-surface);
  border: none;
  font-size: var(--text-2xl);
  font-weight: var(--weight-bold);
  cursor: pointer;
  box-shadow: var(--shadow-xl);
  transition: all var(--transition-fast);
  z-index: var(--z-fixed);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px) scale(0.8);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

.back-to-top:hover {
  background: var(--color-accent-dark);
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 8px 24px rgba(196, 163, 90, 0.4);
}

.back-to-top:active {
  transform: translateY(-2px) scale(1);
}

/* ============================================
   RESPONSIVE ADJUSTMENTS
   ============================================ */

@media (max-width: 768px) {
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 48px;
    height: 48px;
    font-size: var(--text-xl);
  }

  .newsletter-form {
    flex-direction: column;
  }

  .newsletter-form button {
    width: 100%;
  }

  .site-footer .footer-content {
    grid-template-columns: 1fr;
    gap: var(--space-2xl);
  }

  .footer-signature {
    font-size: var(--text-2xl);
  }

  .site-footer .footer-social {
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-footer::before,
  .footer-decoration,
  .footer-newsletter,
  .footer-main,
  .footer-contact,
  .footer-links,
  .site-footer .footer-bottom {
    animation: none !important;
  }
}