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

  /* ========== NAV ========== */
  #site-header {
    background: rgba(254, 252, 251, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(123, 45, 59, 0.08);
  }
  #site-header.scrolled {
    box-shadow: 0 4px 20px rgba(123, 45, 59, 0.08);
  }
  .nav-link {
    position: relative;
  }
  .nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: #7B2D3B;
    transition: width 0.3s ease;
    border-radius: 1px;
  }
  .nav-link:hover::after {
    width: 100%;
  }

  /* ========== MOBILE MENU ========== */
  #mobile-menu {
    pointer-events: none;
  }
  #mobile-menu.open {
    pointer-events: all;
    transform: translateX(0);
  }
  .mobile-nav-link {
    position: relative;
  }
  .mobile-nav-link::after {
    content: '';
    display: block;
    width: 0;
    height: 2px;
    background: #7B2D3B;
    margin: 4px auto 0;
    transition: width 0.3s ease;
  }
  .mobile-nav-link:hover::after,
  .mobile-nav-link:active::after {
    width: 60%;
  }

  /* ========== REVEAL ANIMATIONS ========== */
  @media (prefers-reduced-motion: no-preference) {
    .reveal {
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
    }
    .reveal.revealed {
      opacity: 1;
      transform: translateY(0);
    }
    .reveal:nth-child(2) { transition-delay: 0.1s; }
    .reveal:nth-child(3) { transition-delay: 0.2s; }
    .reveal:nth-child(4) { transition-delay: 0.3s; }
  }

  /* Non-reduced-motion fallback: always visible */
  @media (prefers-reduced-motion: reduce) {
    .reveal {
      opacity: 1;
      transform: none;
      transition: none;
    }
  }

  /* ========== TREE CARDS ========== */
  .tree-card {
    will-change: transform;
  }

  /* ========== SCROLLBAR ========== */
  ::-webkit-scrollbar { width: 8px; }
  ::-webkit-scrollbar-track { background: #fdf6f3; }
  ::-webkit-scrollbar-thumb { background: #f0a4ac; border-radius: 4px; }
  ::-webkit-scrollbar-thumb:hover { background: #e56d7a; }

  /* ========== SELECTION ========== */
  ::selection {
    background: #f0a4ac;
    color: #3d131a;
  }