/* ===== BASE & SCROLL ===== */
  html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
  }

  body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }

  ::-webkit-scrollbar {
    width: 8px;
  }
  ::-webkit-scrollbar-track {
    background: #0f172a;
  }
  ::-webkit-scrollbar-thumb {
    background: #1e293b;
    border-radius: 4px;
  }
  ::-webkit-scrollbar-thumb:hover {
    background: #334155;
  }

  /* ===== NAVIGATION ===== */
  #nav {
    background: transparent;
  }

  #nav.scrolled {
    background: rgba(2, 6, 23, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(14, 165, 233, 0.08);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
  }

  #nav.scrolled .nav-link {
    color: #94a3b8;
  }

  /* ===== MOBILE MENU ===== */
  #mobile-menu.open {
    opacity: 1;
    pointer-events: all;
  }

  #mobile-menu.closed {
    opacity: 0;
    pointer-events: none;
  }

  .mobile-line {
    display: block;
    transition: all 0.3s ease;
  }

  #mobile-toggle.active .mobile-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  #mobile-toggle.active .mobile-line:nth-child(2) {
    opacity: 0;
  }
  #mobile-toggle.active .mobile-line:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
    width: 1.5rem;
  }

  /* ===== HERO ===== */
  #hero {
    position: relative;
  }

  /* ===== PROGRAM CARDS ===== */
  .program-card {
    transform: translateY(0);
  }

  .program-card:hover {
    transform: translateY(-4px);
  }

  /* ===== TESTIMONIAL CARDS ===== */
  .testimonial-card {
    transition: transform 0.4s ease, box-shadow 0.4s ease, border-color 0.4s ease;
  }

  .testimonial-card:hover {
    transform: translateY(-4px);
  }

  /* ===== APPROACH ITEMS ===== */
  .approach-item {
    transition: transform 0.3s ease;
  }

  .approach-item:hover {
    transform: translateX(4px);
  }

  /* ===== SCROLL REVEAL (progressive enhancement) ===== */
  @media (prefers-reduced-motion: no-preference) {
    .reveal {
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 0.7s ease, transform 0.7s ease;
    }

    .reveal.revealed {
      opacity: 1;
      transform: translateY(0);
    }

    .reveal-delay-1 { transition-delay: 0.1s; }
    .reveal-delay-2 { transition-delay: 0.2s; }
    .reveal-delay-3 { transition-delay: 0.3s; }
    .reveal-delay-4 { transition-delay: 0.4s; }
  }

  /* No-reduce-motion: always show content */
  @media (prefers-reduced-motion: reduce) {
    .reveal {
      opacity: 1;
      transform: none;
    }
  }

  /* ===== SELECTION ===== */
  ::selection {
    background: rgba(20, 184, 166, 0.3);
    color: #f1f5f9;
  }

  /* ===== FOCUS ===== */
  :focus-visible {
    outline: 2px solid #14b8a6;
    outline-offset: 2px;
  }

  /* ===== RESPONSIVE ===== */
  @media (max-width: 768px) {
    .font-serif {
      word-spacing: -0.02em;
    }
  }