/* ── Base ────────────────────────────────────────── */
  *, *::before, *::after { box-sizing: border-box; }
  html { scroll-behavior: smooth; scroll-padding-top: 80px; }
  body { margin: 0; -webkit-font-smoothing: antialiased; }

  /* ── Reveal on scroll (progressive enhancement) ──── */
  @media (prefers-reduced-motion: no-preference) {
    .reveal {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
                  transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
    }
    .reveal.revealed {
      opacity: 1;
      transform: translateY(0);
    }
  }
  @media (prefers-reduced-motion: reduce) {
    .reveal { opacity: 1; transform: none; }
  }

  /* ── Nav scroll state ────────────────────────────── */
  #nav.scrolled {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 rgba(255,255,255,0.05);
  }
  #nav.scrolled .nav-logo-text,
  #nav.scrolled .nav-subtle,
  #nav.scrolled #menu-btn { color: #fff; }

  /* ── Mobile menu ─────────────────────────────────── */
  #mobile-menu.open { opacity: 1; pointer-events: auto; }
  .mobile-menu-link {
    position: relative;
  }
  .mobile-menu-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: #2dd4bf;
    transition: width 0.3s ease;
  }
  .mobile-menu-link:hover::after { width: 100%; }

  /* ── Selection ───────────────────────────────────── */
  ::selection { background: rgba(13, 148, 136, 0.2); }

  /* ── Smooth image loading ────────────────────────── */
  img { display: block; max-width: 100%; }