/* ==========================================================================
   Base — reset, typography, focus, and the primitives both pages share.
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
  background: var(--paper);
  /* `clip` contains stray horizontal overflow without creating a scroll
     container, so `position: sticky` keeps working inside the page. */
  overflow-x: clip;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-width: 20rem;
  overflow-x: clip;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--acid);
  color: var(--ink);
}

h1, h2, h3, h4, p, figure, dl, dd {
  margin: 0;
}

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

a {
  color: inherit;
}

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

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

button {
  cursor: pointer;
}

/* --- Focus ---------------------------------------------------------------
   Never remove the ring. Components may restyle it, but every focusable
   element keeps a visible indicator that clears 3:1 against its surface. */
:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 3px;
  border-radius: 2px;
}

:where(a, button):focus:not(:focus-visible) {
  outline: none;
}

.skip-link {
  position: fixed;
  top: var(--space-sm);
  left: var(--space-sm);
  z-index: 60;
  padding: 0.7rem 0.95rem;
  background: var(--acid);
  color: var(--ink);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  text-transform: uppercase;
  transform: translateY(-250%);
  transition: transform var(--dur) var(--ease-out);
}

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

/* --- Utilities ------------------------------------------------------------ */
.hide {
  display: none;
}

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

/* --- Shared section furniture --------------------------------------------- */
.section-shell {
  position: relative;
  padding: var(--section-y) var(--gutter);
}

.section-number {
  margin: 0 0 var(--space-sm);
  color: var(--accent-mark, var(--coral-ink));
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-style: italic;
}

.section-number--light {
  color: var(--acid);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
}

.display-heading {
  font-size: var(--display-md);
  font-weight: 700;
  letter-spacing: var(--tracking-display);
  line-height: var(--leading-display);
  text-wrap: balance;
}

.display-heading em {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 400;
}

/* --- Buttons -------------------------------------------------------------- */
.button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  min-height: 2.75rem;
  border: 1px solid var(--ink);
  padding: 0.7rem 1.15rem;
  background: var(--ink);
  color: var(--paper);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.07em;
  text-decoration: none;
  text-transform: uppercase;
  transition: background var(--dur-fast), color var(--dur-fast), transform var(--dur-fast);
}

.button:hover {
  background: transparent;
  color: var(--ink);
}

.button--ghost {
  background: transparent;
  color: var(--ink);
}

.button--ghost:hover {
  background: var(--ink);
  color: var(--paper);
}

.button--accent {
  border-color: var(--acid);
  background: var(--acid);
  color: var(--ink);
}

.button--accent:hover {
  background: transparent;
  color: var(--acid);
}

.button__arrow {
  font-size: 1em;
  line-height: 1;
  transition: transform var(--dur-fast) var(--ease-out);
}

.button:hover .button__arrow {
  transform: translate(0.15em, -0.15em);
}

/* --- Inline link with a rule ---------------------------------------------- */
.rule-link {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  min-height: 2.75rem;
  border-bottom: 1px solid currentColor;
  color: inherit;
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-decoration: none;
  text-transform: uppercase;
}

/* --- Reveal on scroll ----------------------------------------------------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(1.1rem);
  transition:
    opacity var(--dur-slow) ease,
    transform var(--dur-slow) var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}

.is-revealed {
  opacity: 1;
  transform: none;
}

/* If scripting never runs, content must not stay invisible. */
.no-js [data-reveal] {
  opacity: 1;
  transform: none;
}

@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;
  }

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