*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

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

ul, ol {
  list-style: none;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, select, textarea {
  font: inherit;
  color: inherit;
}

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

.section {
  padding: var(--space-20) 0;
}

@media (max-width: 768px) {
  .section {
    padding: var(--space-12) 0;
  }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.fade-in {
  opacity: 0;
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

.fade-in.visible {
  opacity: 1;
}

/* Default: slide up */
.fade-in:not(.fade-in-left):not(.fade-in-right):not(.fade-in-scale) {
  transform: translateY(24px);
}
.fade-in:not(.fade-in-left):not(.fade-in-right):not(.fade-in-scale).visible {
  transform: translateY(0);
}

/* Directional variants */
.fade-in-left {
  transform: translateX(-24px);
}
.fade-in-left.visible {
  transform: translateX(0);
}

.fade-in-right {
  transform: translateX(24px);
}
.fade-in-right.visible {
  transform: translateX(0);
}

.fade-in-scale {
  transform: scale(0.95);
}
.fade-in-scale.visible {
  transform: scale(1);
}

/* Staggered children */
.stagger > * {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out);
}

.stagger.visible > *:nth-child(1) { transition-delay: 0s; }
.stagger.visible > *:nth-child(2) { transition-delay: 0.1s; }
.stagger.visible > *:nth-child(3) { transition-delay: 0.2s; }
.stagger.visible > *:nth-child(4) { transition-delay: 0.3s; }
.stagger.visible > *:nth-child(5) { transition-delay: 0.35s; }
.stagger.visible > *:nth-child(6) { transition-delay: 0.4s; }
.stagger.visible > *:nth-child(7) { transition-delay: 0.45s; }
.stagger.visible > *:nth-child(8) { transition-delay: 0.5s; }
.stagger.visible > * {
  opacity: 1;
  transform: translateY(0);
}

.code-block {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  margin: var(--space-4) 0;
  overflow-x: auto;
  font-family: var(--font-mono, ui-monospace, monospace);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  color: var(--color-text);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

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

  .fade-in {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .stagger > * {
    opacity: 1;
    transform: none;
    transition: none;
  }
}