/* ============ Nav ============ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-nav);
  padding: var(--space-s) 0;
  background: color-mix(in oklch, var(--bg) 78%, transparent);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease-out),
              background var(--dur) var(--ease-out);
}
.nav[data-scrolled="true"] { border-bottom-color: var(--line-2); }
.nav__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-m);
}
.brand {
  display: inline-flex; align-items: baseline; gap: 0.5ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--step-1);
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: var(--ink);
}
.brand__mark {
  color: var(--accent);
  font-size: 1.4em; line-height: 0;
  transform: translateY(0.10em);
}
.nav__cta {
  display: inline-flex; align-items: center; gap: 0.5ch;
  padding: 0.6rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: var(--step--1);
  transition: border-color var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
}
.nav__cta:hover { border-color: var(--ink); background: var(--surface); }
@media (max-width: 860px) {
  /* Sticky bottom bar owns the mobile CTA — avoid double-CTA in the nav */
  .nav__cta { display: none; }
}

/* ============ Buttons ============ */
.btn {
  --_bg: var(--accent);
  --_ink: var(--accent-ink);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6ch;
  padding: 1rem 1.5rem;
  background: var(--_bg);
  color: var(--_ink);
  font-weight: 500;
  font-size: var(--step-0);
  letter-spacing: -0.005em;
  border-radius: var(--radius);
  transition: background var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
  will-change: transform;
}
.btn:hover { background: var(--accent-hi); }
.btn:active { transform: translateY(1px); }
.btn--lg { padding: 1.15rem 1.8rem; font-size: var(--step-1); }
.btn--ghost {
  --_bg: transparent;
  --_ink: var(--ink);
  border: 1px solid var(--line);
}
.btn--ghost:hover { --_bg: var(--surface); border-color: var(--ink); }

.btn__arrow {
  display: inline-block;
  transition: transform var(--dur) var(--ease-out);
}
.btn:hover .btn__arrow { transform: translateX(4px); }

/* ============ Data badge ============ */
.datum {
  display: inline-flex;
  align-items: center;
  gap: 0.6ch;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.datum::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent);
}

/* ============ Section shell ============ */
section { padding: var(--space-2xl) 0; }
.section-head {
  display: flex; flex-direction: column; gap: var(--space-s);
  margin-bottom: var(--space-xl);
  max-width: 46rem;
}
.section-head__label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

/* ============ Reveal ============
   Safe pattern: content is visible by default.
   Only the .js-reveal root (added by JS on boot) gates it into the "from" state,
   so headless/no-JS/blocked-IO always ships a visible page.
============================= */
.reveal {
  opacity: 1;
  transform: none;
  transition: opacity 700ms var(--ease-out),
              transform 700ms var(--ease-out);
}
html.js-reveal .reveal:not(.is-in) {
  opacity: 0;
  transform: translateY(14px);
}
html.js-reveal .reveal.is-in {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  html.js-reveal .reveal:not(.is-in) { opacity: 1; transform: none; transition: none; }
}