/* ============================================
   RESPONSIVE DESIGN - MOBILE FIRST
   ============================================ */

/* Tablet (768px and up) */
@media screen and (max-width: 1024px) {
  :root {
    --font-size-5xl: 2.5rem;
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.75rem;
  }

  .container {
    padding: 0 var(--spacing-lg);
  }

  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Mobile (768px and below) */
@media screen and (max-width: 768px) {
  :root {
    --font-size-5xl: 2rem;
    --font-size-4xl: 1.75rem;
    --font-size-3xl: 1.5rem;
    --spacing-4xl: 3rem;
    --spacing-3xl: 2rem;
  }

  .container {
    padding: 0 var(--spacing-md);
  }

  /* Navigation Mobile Styles */
  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background-color: var(--bg-primary);
    flex-direction: column;
    gap: 0;
    padding: var(--spacing-lg) 0;
    box-shadow: var(--shadow-lg);
    transform: translateX(-100%);
    transition: transform var(--transition-base);
  }

  .nav-menu.active {
    transform: translateX(0);
  }

  .nav-menu li {
    width: 100%;
    text-align: center;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
  }

  .nav-link::after {
    display: none;
  }

  .mobile-menu-toggle {
    display: block;
  }

  .mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
  }

  .mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
  }

  .mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
  }

  /* Grid Responsive */
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  /* Section Spacing */
  .section {
    padding: var(--spacing-3xl) 0;
  }

  .section-lg {
    padding: var(--spacing-3xl) 0;
  }

  /* Button Responsive */
  .btn {
    width: 100%;
    text-align: center;
  }

  .btn-group {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  /* Footer Responsive */
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  /* Typography Responsive */
  h1, h2, h3 {
    line-height: 1.3;
  }

  /* Card Spacing */
  .card {
    padding: var(--spacing-lg);
  }
}

/* Small Mobile (480px and below) */
@media screen and (max-width: 480px) {
  :root {
    --font-size-5xl: 1.75rem;
    --font-size-4xl: 1.5rem;
    --font-size-3xl: 1.25rem;
  }

  .section {
    padding: var(--spacing-2xl) 0;
  }

  .btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
  }

  .card {
    padding: var(--spacing-md);
  }
}

/* Desktop Large (1200px and up) */
@media screen and (min-width: 1200px) {
  .container {
    max-width: 1400px;
  }
}

/* ============================================
   RESPONSIVE UTILITIES
   ============================================ */

/* Hide on mobile */
@media screen and (max-width: 768px) {
  .hide-mobile {
    display: none !important;
  }
}

/* Hide on desktop */
@media screen and (min-width: 769px) {
  .hide-desktop {
    display: none !important;
  }
}

/* Show only on mobile */
.show-mobile {
  display: none !important;
}

@media screen and (max-width: 768px) {
  .show-mobile {
    display: block !important;
  }
}

/* Show only on desktop */
@media screen and (max-width: 768px) {
  .show-desktop {
    display: none !important;
  }
}