/* Reset, typography primitives and shared components. */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body.is-menu-open {
  overflow: hidden;
}

h1,
h2,
h3,
p,
ul,
ol {
  margin: 0;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

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

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

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

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 100;
  padding: 0.5rem 0.875rem;
  background: var(--color-accent);
  color: var(--color-bg);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  transform: translateY(-200%);
  transition: transform var(--duration-normal) var(--ease-out-expo);
}

.skip-link:focus-visible {
  transform: none;
}

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

/* ---------- Type primitives ---------- */

.mono {
  font-family: var(--font-mono);
  letter-spacing: var(--tracking-mono);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-mono);
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.eyebrow::before,
.bullet::before {
  content: "";
  width: 4px;
  height: 4px;
  flex: none;
  background: currentColor;
}

.eyebrow--accent::before {
  background: var(--color-accent);
}

.index {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  color: var(--color-text-dim);
}

.heading {
  font-size: var(--text-xl);
  font-weight: 400;
  line-height: 1.08;
  letter-spacing: var(--tracking-tight);
  text-wrap: balance;
}

.heading .muted,
.muted {
  color: var(--color-text-muted);
}

.lede {
  max-width: 34rem;
  color: var(--color-text-muted);
  font-size: var(--text-base);
  text-wrap: pretty;
}

/* ---------- Buttons ---------- */

.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  padding: 0.6875rem 1.125rem;
  border: 1px solid var(--color-line-strong);
  background: var(--color-btn-bg);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-mono);
  text-transform: uppercase;
  white-space: nowrap;
  transition:
    background-color var(--duration-normal) var(--ease-out-expo),
    color var(--duration-normal) var(--ease-out-expo),
    border-color var(--duration-normal) var(--ease-out-expo);
}

.btn:hover {
  background: var(--color-text);
  border-color: var(--color-text);
  color: var(--color-bg);
}

.btn:active {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.btn--ghost {
  border-color: transparent;
  background: none;
  color: var(--color-text-muted);
}

.btn--ghost:hover {
  background: none;
  border-color: transparent;
  color: var(--color-accent);
}

.arrow {
  display: inline-block;
  transition: transform var(--duration-normal) var(--ease-out-expo);
}

/* ---------- ASCII surfaces ---------- */

.ascii {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1;
  letter-spacing: 0;
  white-space: pre;
  color: var(--color-text-dim);
  overflow: hidden;
  user-select: none;
  pointer-events: none;
  font-variant-ligatures: none;
}

.ascii--fill {
  position: absolute;
  inset: 0;
}

.ascii canvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* ---------- Reveal on scroll (only when JS runs) ---------- */

.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity var(--duration-slow) var(--ease-out-expo),
    transform var(--duration-slow) var(--ease-out-expo);
  transition-delay: var(--reveal-delay, 0ms);
}

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

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

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