/* ========== BASE ========== */
  *, *::before, *::after { box-sizing: border-box; }
  html { scroll-behavior: smooth; scroll-padding-top: 80px; }
  body { margin: 0; }
  img { max-width: 100%; height: auto; }

  /* ========== SCROLL REVEAL ========== */
  .reveal {
    opacity: 1;
    transform: none;
    transition: opacity 0.6s ease, transform 0.6s ease;
  }
  @media (prefers-reduced-motion: no-preference) {
    .reveal {
      opacity: 0;
      transform: translateY(24px);
    }
    .reveal.revealed {
      opacity: 1;
      transform: translateY(0);
    }
  }

  /* ========== FLOAT ANIMATION ========== */
  @keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-8px); }
  }
  .animate-float {
    animation: float 3.5s ease-in-out infinite;
  }

  /* ========== NAV SCROLL STATE ========== */
  #nav.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 20px rgba(0, 0, 0, 0.08);
  }
  #nav.scrolled .nav-link { color: #334155; }
  #nav.scrolled .nav-link:hover { color: #0d9488; }

  /* ========== MOBILE MENU ========== */
  #mobile-menu {
    animation: slideDown 0.25s ease;
  }
  @keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
  }

  /* ========== CUSTOM SCROLLBAR ========== */
  ::-webkit-scrollbar { width: 8px; }
  ::-webkit-scrollbar-track { background: #f1f5f9; }
  ::-webkit-scrollbar-thumb { background: #94a3b8; border-radius: 4px; }
  ::-webkit-scrollbar-thumb:hover { background: #64748b; }

  /* ========== SELECTION ========== */
  ::selection { background: #ccfbf1; color: #134e4a; }