/* ── Base ── */
  *, *::before, *::after { box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body { margin: 0; }

  /* ── Scroll Reveal (progressive enhancement) ── */
  @media (prefers-reduced-motion: no-preference) {
    .reveal-up,
    .reveal-left,
    .reveal-right {
      opacity: 1;
      transform: none;
      transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
                  transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
    }
    .reveal-up { transform: translateY(0); }
    .reveal-left { transform: translateX(0); }
    .reveal-right { transform: translateX(0); }
  }

  /* When JS is active, use intersection observer for scroll-triggered reveals */
  .js-active .reveal-up,
  .js-active .reveal-left,
  .js-active .reveal-right {
    opacity: 0;
  }
  .js-active .reveal-up { transform: translateY(40px); }
  .js-active .reveal-left { transform: translateX(-40px); }
  .js-active .reveal-right { transform: translateX(40px); }

  .js-active .reveal-up.visible,
  .js-active .reveal-left.visible,
  .js-active .reveal-right.visible {
    opacity: 1;
    transform: none;
  }

  /* ── Navbar scroll state ── */
  #navbar.scrolled {
    background: rgba(13, 27, 42, 0.95);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 rgba(255,255,255,0.05);
  }

  /* ── Mobile menu transitions ── */
  #mobileMenu.open {
    opacity: 1;
    pointer-events: all;
  }

  /* ── Custom scrollbar ── */
  ::-webkit-scrollbar { width: 8px; }
  ::-webkit-scrollbar-track { background: #0D1B2A; }
  ::-webkit-scrollbar-thumb { background: #335284; border-radius: 4px; }
  ::-webkit-scrollbar-thumb:hover { background: #526e9f; }

  /* ── Selection ── */
  ::selection { background: rgba(143, 212, 175, 0.3); color: #fff; }