/* Layout: Header, Footer, Main - Liquid Design */

.site-layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  position: relative;
}

/* Enhanced Liquid Animated Background */
.site-layout::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: -2;
  background: var(--color-bg);
  background-image:
    var(--liquid-gradient-foam),
    var(--liquid-gradient-2),
    var(--liquid-gradient-3),
    var(--liquid-gradient-depth);
  background-size: 120% 100%, 180% 180%, 160% 160%, 100% 100%;
  background-position: 50% 0%, 20% 50%, 80% 50%, 0% 0%;
  animation: liquidFlow 25s ease-in-out infinite;
  pointer-events: none;
}

/* Secondary layer for more organic movement */
.site-layout::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: -1;
  background-image:
    radial-gradient(
      ellipse 50% 40% at 60% 70%,
      rgba(34, 211, 238, 0.08) 0%,
      transparent 50%
    ),
    radial-gradient(
      ellipse 45% 35% at 35% 30%,
      rgba(20, 184, 166, 0.1) 0%,
      transparent 55%
    );
  background-size: 140% 140%, 130% 130%;
  animation: liquidDrift 30s ease-in-out infinite reverse;
  pointer-events: none;
}

@keyframes liquidFlow {
  0%, 100% {
    background-position: 50% 0%, 20% 50%, 80% 50%, 0% 0%;
  }
  25% {
    background-position: 45% 5%, 35% 45%, 65% 55%, 0% 0%;
  }
  50% {
    background-position: 55% 0%, 80% 50%, 20% 50%, 0% 0%;
  }
  75% {
    background-position: 48% 3%, 50% 55%, 50% 45%, 0% 0%;
  }
}

@keyframes liquidDrift {
  0%, 100% {
    background-position: 60% 70%, 35% 30%;
    opacity: 0.8;
  }
  33% {
    background-position: 40% 60%, 55% 40%;
    opacity: 1;
  }
  66% {
    background-position: 70% 55%, 25% 45%;
    opacity: 0.9;
  }
}

.skip-link {
  position: absolute;
  top: -9999px;
  left: 1rem;
  background: var(--color-primary);
  color: white;
  padding: 0.5rem 1rem;
  z-index: 100;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  font-weight: 600;
  text-decoration: none;
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 0;
  outline: 2px solid white;
  outline-offset: 2px;
}

.site-content {
  flex: 1;
  padding-top: var(--spacing-xl);
  padding-bottom: var(--spacing-2xl);
}

/* Glass-morphic Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-filter);
  backdrop-filter: var(--glass-filter);
  border-bottom: 1px solid var(--glass-border);
  padding: var(--spacing-md) 0;
  box-shadow:
    0 1px 3px rgba(0, 0, 0, 0.04),
    0 4px 16px rgba(31, 38, 135, 0.06),
    var(--glass-inner-glow);
  transition:
    background-color var(--animation-duration-fast) var(--animation-easing-smooth),
    box-shadow var(--animation-duration-fast) var(--animation-easing-smooth);
}

/* Header becomes more opaque when scrolled */
.site-header--scrolled {
  background: var(--glass-bg-active);
  box-shadow:
    0 1px 3px rgba(0, 0, 0, 0.06),
    0 8px 24px rgba(31, 38, 135, 0.1),
    var(--glass-inner-glow);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-lg);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.logo-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text);
  transition: transform var(--animation-duration-fast);
}

.logo-link:hover {
  transform: translateY(-2px);
}

.logo-icon {
  width: 32px;
  height: 32px;
  transition: transform var(--animation-duration-fast);
}

.logo-link:hover .logo-icon {
  transform: rotate(-5deg) scale(1.1);
}

.site-nav {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

.site-nav a {
  font-weight: 500;
  font-size: 1rem;
  color: var(--color-text-muted);
  position: relative;
  padding: 0.25rem 0;
  transition: color var(--animation-duration-fast);
}

.site-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--liquid-gradient-1);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--animation-duration-fast) var(--animation-easing-smooth);
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-primary);
}

.site-nav a:hover::after,
.site-nav a.active::after {
  transform: scaleX(1);
}

/* Responsive Nav */
@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .site-nav {
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
  }
}

/* Footer */
.site-footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-xl) 0;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-top: var(--spacing-2xl);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
  text-align: center;
}

.footer-copyright {
  order: 2;
}

.footer-nav {
  order: 1;
  display: flex;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
  justify-content: center;
}

.footer-nav a {
  transition: color var(--animation-duration-fast);
}

.footer-nav a:hover {
  color: var(--color-primary);
}

@media (min-width: 768px) {
  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
  
  .footer-copyright {
    order: 1;
  }
  
  .footer-nav {
    order: 2;
  }
}

/* Grid System */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

@media (max-width: 640px) {
  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
  }
}

/* Reduced Motion: Disable liquid background animations */
@media (prefers-reduced-motion: reduce) {
  .site-layout::before,
  .site-layout::after {
    animation: none !important;
  }
}

/* ===========================================
   GLASS FALLBACK
   For browsers without backdrop-filter support
   =========================================== */
@supports not (backdrop-filter: blur(1px)) {
  .site-header {
    background: rgba(248, 250, 252, 0.96);
    box-shadow:
      0 1px 3px rgba(0, 0, 0, 0.08),
      0 4px 12px rgba(0, 0, 0, 0.06),
      0 8px 32px rgba(31, 38, 135, 0.1);
  }
}