:root {
  --page-age: 0;
  --aging-factor: calc(var(--page-age) / 1000);
  --patina-alpha: calc(min(var(--aging-factor) * 0.3, 0.6));
  --weathering-amount: calc(min(var(--aging-factor) * 2, 8));
  --settling-space: calc(min(var(--aging-factor) * 0.5, 2));
}

.aging-content {
  font-family: var(--font-age);
  letter-spacing: calc(0.02em + var(--settling-space) * 0.01em);
  word-spacing: calc(0.05em + var(--settling-space) * 0.02em);
  position: relative;
  transition: all 2s ease-in-out;
}

.aging-content::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 0.98em,
    rgba(139, 119, 101, var(--patina-alpha)) 0.99em,
    rgba(139, 119, 101, var(--patina-alpha)) 1em
  );
  pointer-events: none;
  opacity: var(--aging-factor);
  mix-blend-mode: multiply;
}

.fresh-text {
  --font-age: system-ui, -apple-system, sans-serif;
  font-weight: 400;
  color: #2c3e50;
  text-shadow: none;
}

.settling-text {
  --font-age: Georgia, "Times New Roman", serif;
  font-weight: 350;
  color: #34495e;
  text-shadow: 0.5px 0.5px 0px rgba(0,0,0,0.1);
}

.weathered-text {
  --font-age: "Courier New", monospace;
  font-weight: 300;
  color: #5d6d7e;
  text-shadow: 1px 1px 0px rgba(0,0,0,0.15);
  filter: blur(calc(var(--weathering-amount) * 0.01px));
}

.aged-text {
  --font-age: serif;
  font-weight: 280;
  color: #85929e;
  text-shadow: 1px 1px 1px rgba(0,0,0,0.2);
  filter: blur(calc(var(--weathering-amount) * 0.02px)) sepia(0.1);
}

.time-indicator {
  position: fixed;
  top: 20px;
  right: 20px;
  font-family: monospace;
  font-size: 0.8em;
  padding: 8px 12px;
  background: rgba(0,0,0,0.1);
  border-radius: 4px;
  z-index: 1000;
}

.patina-layer {
  position: relative;
  overflow: hidden;
}

.patina-layer::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(139, 119, 101, var(--patina-alpha)) 1px, transparent 2px),
    radial-gradient(circle at 70% 70%, rgba(160, 82, 45, var(--patina-alpha)) 1px, transparent 2px),
    radial-gradient(circle at 40% 80%, rgba(101, 67, 33, var(--patina-alpha)) 1px, transparent 2px);
  background-size: 8px 8px, 12px 12px, 6px 6px;
  opacity: calc(var(--aging-factor) * 0.8);
  pointer-events: none;
}

.stage-label {
  display: inline-block;
  padding: 2px 6px;
  font-size: 0.7em;
  font-family: monospace;
  background: rgba(52, 73, 94, 0.1);
  border-radius: 3px;
  margin-left: 8px;
  transition: opacity 1s ease;
}

.demo-section {
  margin: 2em 0;
  padding: 1.5em;
  border: 1px solid #ecf0f1;
  border-radius: 4px;
}

@media (max-width: 768px) {
  .time-indicator {
    top: 10px;
    right: 10px;
    font-size: 0.7em;
    padding: 6px 8px;
  }
  
  .aging-content {
    font-size: 0.9em;
  }
}