/* Mobile-first responsive design optimizations for SEO */

/* Responsive typography */
@media (max-width: 640px) {
  h1 {
    font-size: 1.875rem !important; /* 30px */
  }
  
  h2 {
    font-size: 1.5rem !important; /* 24px */
  }
  
  h3 {
    font-size: 1.25rem !important; /* 20px */
  }
  
  p, li {
    font-size: 1rem !important; /* 16px */
  }
}

/* Responsive Header & Logo */
@media (max-width: 991px) {
  header {
    padding: 10px 0 !important;
  }
  .header-container {
    flex-direction: column !important;
    align-items: center !important;
    padding: 0 10px !important;
    gap: 5px !important;
  }
  .logo-container {
    position: static !important;
    margin: 0 auto 10px !important;
    box-shadow: none !important;
    width: 120px !important;
    display: block !important;
    background: transparent !important;
  }
  .logo-container img {
    width: 100% !important;
    height: auto !important;
    display: block !important;
  }
  .header-bottom {
    width: 100% !important;
    flex-direction: column !important;
    align-items: center !important;
    gap: 10px !important;
  }
  .search-container {
    width: 100% !important;
    max-width: 100% !important;
  }
  #main-search-form {
    width: 100% !important;
  }
  .hero-content {
    margin-left: 0 !important;
  }
  .desktop-logo-space {
    display: none !important;
  }
}

/* Hero Section Responsive */
@media (max-width: 768px) {
  section.bg-gray-900.relative {
    margin-top: 0 !important;
    height: auto !important;
    min-height: 280px !important;
    padding-top: 40px !important;
    padding-bottom: 40px !important;
  }
  .hero-content {
    margin-left: 0 !important;
    padding: 20px 0 !important;
    text-align: center !important;
  }
  .hero-content > div {
    max-width: 100% !important;
    width: 100% !important;
  }
  .hero-content h1 {
    font-size: 24px !important;
  }
  .hero-content p {
    font-size: 14px !important;
  }
}

/* Course Headers Responsive */
@media (max-width: 767px) {
  .bg-gray-100.py-16 {
    padding-top: 40px !important;
    padding-bottom: 40px !important;
  }
  .container.mx-auto.px-6 {
    padding-left: 15px !important;
    padding-right: 15px !important;
  }
}


/* Hero Section Responsive */
@media (max-width: 768px) {
  section.bg-gray-900.relative {
    margin-top: 0 !important;
    height: auto !important;
    min-height: 280px !important;
    padding-top: 40px !important;
    padding-bottom: 40px !important;
  }
  
  .hero-content {
    margin-left: 0 !important;
    padding: 20px 0 !important;
    text-align: center !important;
  }
  
  .hero-content > div {
    max-width: 100% !important;
    width: 100% !important;
  }
  
  .hero-content h1 {
    font-size: 24px !important;
  }
  
  .hero-content p {
    font-size: 14px !important;
  }
}

/* Course Headers Responsive */
@media (max-width: 767px) {
  .bg-gray-100.py-16 {
    padding-top: 40px !important;
    padding-bottom: 40px !important;
  }
  
  .container.mx-auto.px-6 {
    padding-left: 15px !important;
    padding-right: 15px !important;
  }
}

/* Core Web Vitals optimizations */
.content-container {
  content-visibility: auto;
  contain-intrinsic-size: 1px 5000px;
}

/* Prevent CLS (Cumulative Layout Shift) */
img, iframe, video {
  aspect-ratio: attr(width) / attr(height);
  max-width: 100%;
  height: auto;
}

/* Mobile menu optimizations */
@media (max-width: 768px) {
  .mobile-nav-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 50;
    background-color: rgba(0, 0, 0, 0.5);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
  }
  
  .mobile-nav-container.open {
    opacity: 1;
    pointer-events: auto;
  }
  
  .mobile-nav {
    position: absolute;
    top: 0;
    right: 0;
    width: 80%;
    max-width: 300px;
    height: 100%;
    background-color: white;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    padding: 1rem;
    overflow-y: auto;
  }
  
  .mobile-nav-container.open .mobile-nav {
    transform: translateX(0);
  }
}

/* Better mobile touch targets */
@media (max-width: 768px) {
  button, a {
    min-height: 44px;
    min-width: 44px;
  }
  
  input, select, textarea {
    font-size: 16px !important; /* Prevents iOS zoom on focus */
  }
}

/* Print styles for course materials */
@media print {
  .no-print {
    display: none !important;
  }
  
  body {
    font-size: 12pt;
    line-height: 1.5;
    color: #000;
    background: #fff;
  }
  
  a {
    color: #000;
    text-decoration: underline;
  }
  
  img {
    max-width: 100% !important;
    page-break-inside: avoid;
  }
  
  h1, h2, h3, h4 {
    page-break-after: avoid;
    page-break-inside: avoid;
  }
  
  table, figure {
    page-break-inside: avoid;
  }
}