/* ─────────────────────────────────────────────────────────────
   base.css — reset, body, animations, reveal classes, responsive
   ───────────────────────────────────────────────────────────── */

/* ── Reset ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; overflow-x: clip; }
body {
  font-family: var(--font-body);
  background: var(--color-paper);
  color: var(--color-ink);
  line-height: var(--leading-normal);
  overflow-x: clip;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; font-family: var(--font-display); border: none; background: none; }
ul, ol { list-style: none; }

/* ── Keyframes ───────────────────────────────────────────── */
@keyframes pulse-ring {
  0%   { transform: scale(1);    opacity: 0.25; }
  60%  { transform: scale(1.25); opacity: 0;    }
  100% { transform: scale(1.25); opacity: 0;    }
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.35; }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
@keyframes fade-up {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Scroll-reveal ───────────────────────────────────────── */
.js-reveal {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity var(--dur-crawl) var(--ease-out),
    transform var(--dur-crawl) var(--ease-out);
}
.js-reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}
/* Stagger siblings */
.js-reveal:nth-child(2) { transition-delay: 100ms; }
.js-reveal:nth-child(3) { transition-delay: 180ms; }
.js-reveal:nth-child(4) { transition-delay: 260ms; }
.js-reveal:nth-child(5) { transition-delay: 340ms; }
.js-reveal:nth-child(6) { transition-delay: 420ms; }

/* ── Reduced motion ──────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 80ms !important;
  }
  .js-reveal {
    opacity: 1;
    transform: none;
    transition: opacity 80ms !important;
  }
}

/* ── Responsive · 1024px ─────────────────────────────────── */
@media (max-width: 1024px) {
  .services__grid     { grid-template-columns: repeat(2, 1fr); }
  .why__grid          { grid-template-columns: repeat(2, 1fr); }
  .process__steps     { grid-template-columns: repeat(2, 1fr); }
  .process__connector { display: none; }
  .hero__heading      { font-size: clamp(2.5rem, 5vw, var(--text-display-s)); }
}

/* ── Responsive · 768px ──────────────────────────────────── */
@media (max-width: 768px) {
  .nav__links, .nav__actions { display: none; }
  .nav__hamburger { display: flex; }

  .hero__inner         { grid-template-columns: 1fr; gap: var(--space-12); padding-top: var(--space-16); }
  .hero__heading       { font-size: var(--text-display-s); }
  .hero__art           { min-height: 280px; }
  .ai-net              { max-width: 280px; }

  .services__grid      { grid-template-columns: 1fr; }
  .ai-focus__inner     { grid-template-columns: 1fr; gap: var(--space-12); }
  .process__steps      { grid-template-columns: 1fr; gap: var(--space-8); }
  .process__connector  { display: none; }
  .why__grid           { grid-template-columns: 1fr; }
  .cta-band__inner     { grid-template-columns: 1fr; gap: var(--space-12); }
  .cta-form__row       { grid-template-columns: 1fr; }

  .footer__statement-inner { padding: var(--space-16) var(--space-5) var(--space-12); }
  .footer__watermark   { display: none; }
  .footer__bar-inner   { gap: var(--space-4); padding: var(--space-5); }
  .footer__bar-nav     { gap: var(--space-4); }
  .footer__bar-copy    { margin-left: 0; width: 100%; }

  .stats               { gap: var(--space-5); }
  .stats__divider      { display: none; }
}

/* ── Responsive · 414px ──────────────────────────────────── */
@media (max-width: 414px) {
  .nav__inner          { padding: var(--space-4); }
  .hero                { padding: var(--space-16) 0 var(--space-12); }
  .hero__inner         { padding: 0 var(--space-5); }
  .hero__heading       { font-size: var(--text-3xl); }
  .hero__sub           { font-size: var(--text-base); }
  .hero__actions       { flex-direction: column; align-items: stretch; }
  .hero__actions .btn  { text-align: center; }
  .hero__trust         { flex-direction: column; gap: var(--space-2); }
  .hero__trust-sep     { display: none; }

  .section-inner       { padding: var(--space-16) var(--space-5); }
  .ai-focus__inner     { padding: var(--space-16) var(--space-5); }
  .cta-band__inner     { padding: var(--space-16) var(--space-5); }

  .footer__statement-inner  { padding: var(--space-12) var(--space-5) var(--space-10); }
  .footer__statement-heading { font-size: var(--text-2xl); }
  .footer__bar-nav     { gap: var(--space-3); }

  .section-heading     { font-size: var(--text-2xl); }
  .cta-band__heading   { font-size: var(--text-2xl); }
  .ai-focus__heading   { font-size: var(--text-2xl); }
  .stats__item         { min-width: 80px; }
  .stats               { padding-left: var(--space-5); padding-right: var(--space-5); }
  .ai-net              { max-width: 240px; }
}

/* ── Responsive · 375px ──────────────────────────────────── */
@media (max-width: 375px) {
  .hero__heading { font-size: var(--text-2xl); }
  .btn--lg       { font-size: var(--text-base); padding: var(--space-3) var(--space-6); }
}