/* ============================================================
   Fruit Apps — shared foundation (all pages)
   Tokens · reset · base type · nav · footer · motion utilities
   Aesthetic lane: Apple.com pure-white precision. OKLCH throughout.
   ============================================================ */

/* ---- Design tokens ---- */
:root {
  --bg:            oklch(0.145 0.000 0);
  --surface:       oklch(0.190 0.000 0);
  --ink:           oklch(0.960 0.000 0);
  --ink-muted:     oklch(0.720 0.000 0);
  --ink-faint:     oklch(0.560 0.000 0);
  --hairline:      oklch(0.280 0.000 0);
  --accent:        oklch(0.760 0.145 68);
  --accent-deep:   oklch(0.780 0.150 70);

  --font-sans: "Geist", ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-display: var(--font-sans);
  --font-mono: "Geist Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --step-hero:  clamp(2.5rem, 6.5vw, 5rem);
  --step-h2:    clamp(2rem, 4.5vw, 3.4rem);
  --step-h3:    clamp(1.4rem, 2.4vw, 2rem);
  --step-lead:  clamp(1.15rem, 1.6vw, 1.4rem);
  --step-body:  1.075rem;

  --pad-x: clamp(1.25rem, 5vw, 4rem);
  --section-y: clamp(5rem, 13vh, 10rem);
  --measure: 66ch;

  --ease-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --dur: 820ms;
  --z-nav: 100;
}

:root[data-theme="light"] {
  --bg:        oklch(1.000 0.000 0);
  --surface:   oklch(0.985 0.000 0);
  --ink:       oklch(0.170 0.000 0);
  --ink-muted: oklch(0.440 0.000 0);
  --ink-faint: oklch(0.620 0.000 0);
  --hairline:  oklch(0.912 0.000 0);
  --accent:    oklch(0.700 0.150 65);
  --accent-deep: oklch(0.560 0.130 55);
  color-scheme: light;
}
:root[data-theme="dark"] {
  color-scheme: dark;
}

/* ---- Reset-ish base ---- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; color-scheme: dark light; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
:target, [id] { scroll-margin-top: 84px; }

.skip-link {
  position: absolute; left: 1rem; top: -3rem; z-index: 200;
  background: var(--ink); color: var(--bg);
  padding: 0.6rem 1rem; border-radius: 8px; font-size: 0.95rem;
  transition: top 200ms var(--ease-expo);
}
.skip-link:focus-visible { top: 1rem; }

a, button { touch-action: manipulation; -webkit-tap-highlight-color: transparent; }

body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--font-sans); font-size: var(--step-body); line-height: 1.6;
  font-feature-settings: "ss01", "cv01";
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}

h1, h2, h3 { margin: 0; font-family: var(--font-display); font-weight: 560; letter-spacing: -0.03em; line-height: 1.04; text-wrap: balance; }
p { margin: 0; text-wrap: pretty; }
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }

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

.container { width: 100%; max-width: 1180px; margin-inline: auto; padding-inline: var(--pad-x); }
.section { padding-block: var(--section-y); }
.section--tight { padding-block: clamp(3rem, 7vh, 5.5rem); }

/* ---- Navigation ---- */
.nav {
  position: sticky; top: 0; z-index: var(--z-nav);
  background: color-mix(in oklab, var(--bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 400ms var(--ease-expo);
}
.nav[data-scrolled="true"] { border-bottom-color: var(--hairline); }
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.wordmark { display: inline-flex; align-items: center; gap: 0.55rem; font-weight: 600; letter-spacing: -0.02em; font-size: 1.05rem; }
.wordmark img { width: 26px; height: 26px; }
.wordmark .dot { color: var(--accent-deep); }
.nav__links { display: flex; align-items: center; gap: clamp(1rem, 3vw, 2.25rem); }
.nav__link { color: var(--ink-muted); font-size: 0.975rem; transition: color 200ms ease; }
.nav__link:hover, .nav__link[aria-current="page"] { color: var(--ink); }
.nav__cta {
  color: var(--bg); background: var(--ink);
  padding: 0.5rem 1.1rem; border-radius: 999px; font-size: 0.95rem; font-weight: 500;
  transition: transform 220ms var(--ease-expo), opacity 220ms ease;
}
.nav__cta:hover { transform: translateY(-1px); opacity: 0.9; }
@media (max-width: 620px) { .nav__link { display: none; } }

/* ---- Footer ---- */
.footer { border-top: 1px solid var(--hairline); padding-block: clamp(3rem, 6vh, 4.5rem); }
.footer__grid { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 2.5rem; }
.footer__desc { color: var(--ink-muted); max-width: 34ch; margin-top: 1rem; font-size: 0.98rem; }
.footer__col h4 { font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--ink-faint); font-weight: 600; margin-bottom: 0.9rem; }
.footer__col a { display: block; color: var(--ink-muted); font-size: 0.95rem; padding-block: 0.28rem; transition: color 180ms ease; }
.footer__col a:hover { color: var(--ink); }
.footer__bottom { margin-top: clamp(2.5rem, 5vh, 3.5rem); padding-top: 1.5rem; border-top: 1px solid var(--hairline); color: var(--ink-faint); font-size: 0.9rem; }
@media (max-width: 720px) { .footer__grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 480px) { .footer__grid { grid-template-columns: 1fr; } }

/* ---- Motion: reveals enhance an already-visible default ---- */
.motion-ready .reveal { opacity: 0; transform: translateY(26px); }
.motion-ready .reveal.is-visible {
  opacity: 1; transform: none;
  transition: opacity var(--dur) var(--ease-expo), transform var(--dur) var(--ease-expo);
}
.motion-ready .reveal[data-delay="1"].is-visible { transition-delay: 90ms; }
.motion-ready .reveal[data-delay="2"].is-visible { transition-delay: 180ms; }
.motion-ready .reveal[data-delay="3"].is-visible { transition-delay: 270ms; }
@media (prefers-reduced-motion: reduce) {
  .motion-ready .reveal, .motion-ready .reveal.is-visible { opacity: 1; transform: none; transition: none; }
}