body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--bg-primary);
}

h1, h2, h3, h4 {
  font-family: var(--font-mono);
  color: var(--color-text-bright);
  font-weight: 700;
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }

@media (min-width: 768px) {
  h1 { font-size: var(--text-5xl); }
  h2 { font-size: var(--text-4xl); }
}

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

::selection {
  background: var(--color-primary);
  color: var(--bg-primary);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.section {
  padding: var(--space-3xl) 0;
}

.section-header {
  margin-bottom: var(--space-2xl);
}

.section-header h2 {
  margin-bottom: var(--space-sm);
}

.section-header h2 .accent {
  color: var(--color-primary);
}

.section-subtitle {
  color: var(--color-text-dim);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-secondary); }
.text-accent { color: var(--color-accent); }
.text-warning { color: var(--color-warning); }
.text-dim { color: var(--color-text-dim); }

/* Scroll-triggered animations */
.scroll-fade {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.scroll-fade.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger animation for grids */
.card-grid .scroll-fade:nth-child(1) { transition-delay: 0ms; }
.card-grid .scroll-fade:nth-child(2) { transition-delay: 100ms; }
.card-grid .scroll-fade:nth-child(3) { transition-delay: 200ms; }
.card-grid .scroll-fade:nth-child(4) { transition-delay: 300ms; }
.card-grid .scroll-fade:nth-child(5) { transition-delay: 400ms; }
.card-grid .scroll-fade:nth-child(6) { transition-delay: 500ms; }

.pillars-grid .scroll-fade:nth-child(1) { transition-delay: 0ms; }
.pillars-grid .scroll-fade:nth-child(2) { transition-delay: 100ms; }
.pillars-grid .scroll-fade:nth-child(3) { transition-delay: 200ms; }
.pillars-grid .scroll-fade:nth-child(4) { transition-delay: 300ms; }

/* Scroll to top button */
.scroll-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 50;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.scroll-top.visible {
  opacity: 1;
  pointer-events: auto;
}

.scroll-top:hover {
  border-color: var(--color-primary);
  box-shadow: var(--glow-primary);
}

/* Gradient text utility */
.gradient-text {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Lazy loaded images */
img.lazy {
  opacity: 0;
  filter: blur(10px);
  transition: opacity 0.4s ease, filter 0.4s ease;
}

img.lazy-loaded {
  opacity: 1;
  filter: none;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .scroll-fade {
    opacity: 1;
    transform: none;
  }
}