/* ==========================================================================
   Base — reset, global typography, layout primitives, reveal engine
   ========================================================================== */

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

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

body {
  font-family: var(--font-stack);
  font-size: var(--text-body);
  line-height: var(--leading-body);
  color: var(--color-text-secondary);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;
  transition:
    background-color var(--duration-theme) var(--ease-gentle),
    color var(--duration-theme) var(--ease-gentle);
}

h1, h2, h3, .eyebrow {
  transition: color var(--duration-theme) var(--ease-gentle);
}

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

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

ul,
ol {
  list-style: none;
}

h1, h2, h3 {
  color: var(--color-text-primary);
  font-weight: 600;
  text-wrap: balance;
}

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

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---- Layout primitives -------------------------------------------------- */

.container,
.container-wide {
  width: 100%;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container       { max-width: calc(var(--container-max) + 2 * var(--gutter)); }
.container-wide  { max-width: calc(var(--container-wide) + 2 * var(--gutter)); }

/* ---- Shared text patterns ------------------------------------------------ */

.eyebrow {
  color: var(--color-accent);
  font-size: var(--text-eyebrow);
  font-weight: 600;
  line-height: 1.3;
}

.section-header {
  text-align: center;
}

.section-header .eyebrow {
  margin-bottom: 0.75rem;
}

.section-header__title {
  font-size: var(--text-title);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
}

.section-header__sub {
  margin-top: 1rem;
  color: var(--color-text-secondary);
  max-width: 43rem;
  margin-inline: auto;
}

/* ---- Accessibility helpers ----------------------------------------------- */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--color-fill-inverse);
  color: var(--color-text-inverse);
  border-radius: var(--radius-pill);
  font-weight: 600;
  transform: translateY(-64px);
  transition: transform var(--duration-fast) var(--ease-gentle);
}

.skip-link:focus-visible {
  transform: translateY(0);
}

/* ==========================================================================
   Reveal engine
   Elements tagged [data-reveal] start hidden (only when JS is available)
   and transition in when .is-revealed is added by the IntersectionObserver.
   Children of [data-reveal-group] receive --stagger for cascading delays.
   ========================================================================== */

.js [data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity var(--duration-reveal) var(--ease-gentle),
    transform var(--duration-reveal) var(--ease-gentle);
  transition-delay: calc(var(--stagger, 0) * var(--stagger-step));
  will-change: opacity, transform;
}

.js [data-reveal="scale"] {
  transform: translateY(32px) scale(0.965);
}

.js [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .js [data-parallax] {
    transform: none !important;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}