/* Container */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--space-8);
  }
}

/* Header */
.header {
  height: var(--header-height);
  border-bottom: 1px solid var(--color-gray-200);
  background: var(--color-white);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-inner {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-4);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-logo {
  font-size: var(--font-size-xl);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.header-nav {
  display: none;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .header-nav {
    display: flex;
  }
}

.header-nav a {
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 500;
}

.header-actions {
  display: flex;
  gap: var(--space-4);
  align-items: center;
}

/* Ensure minimum 44x44px touch targets for accessibility */
.header-actions a,
.header-actions button {
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2);
}

/* Hide desktop-only elements on mobile */
@media (max-width: 767px) {
  .desktop-only {
    display: none;
  }
}

/* ========================================
   MOBILE NAVIGATION
   ======================================== */

/* Mobile menu toggle button */
.mobile-menu-toggle {
  display: block;
  position: relative;
  cursor: pointer;
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 60;
}

@media (min-width: 768px) {
  .mobile-menu-toggle {
    display: none;
  }
}

/* Hide checkbox */
.mobile-menu-checkbox {
  position: absolute;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
  z-index: 61;
}

/* Hamburger icon */
.hamburger-icon {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  position: relative;
}

.hamburger-icon span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--color-black);
  transition: all 0.3s ease;
  border-radius: 2px;
}

/* Hamburger animation when checked */
.mobile-menu-checkbox:checked ~ .hamburger-icon span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.mobile-menu-checkbox:checked ~ .hamburger-icon span:nth-child(2) {
  opacity: 0;
}

.mobile-menu-checkbox:checked ~ .hamburger-icon span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Mobile navigation drawer */
.mobile-nav {
  position: fixed;
  top: var(--header-height);
  left: -100%;
  width: 80%;
  max-width: 300px;
  height: calc(100vh - var(--header-height));
  background: var(--color-white);
  box-shadow: 2px 0 8px rgba(0, 0, 0, 0.1);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  transition: left 0.3s ease;
  z-index: 55;
  overflow-y: auto;
}

.mobile-menu-checkbox:checked ~ .mobile-nav {
  left: 0;
}

.mobile-nav a {
  padding: var(--space-3);
  font-size: var(--font-size-base);
  color: var(--color-black);
  text-decoration: none;
  border-bottom: 1px solid var(--color-gray-200);
  transition: background-color 0.2s ease;
  min-height: 44px;
  display: flex;
  align-items: center;
}

.mobile-nav a:hover {
  background-color: var(--color-gray-50);
}

@media (min-width: 768px) {
  .mobile-nav {
    display: none;
  }
}

/* Main Content */
.main {
  min-height: calc(100vh - var(--header-height) - 200px);
  padding: var(--space-8) 0;
}

/* Footer */
.footer {
  border-top: 1px solid var(--color-gray-200);
  padding: var(--space-12) 0;
  margin-top: var(--space-16);
  background: var(--color-gray-50);
}

.footer-inner {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.footer-section h2 {
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: var(--space-2);
}

.footer-section a {
  font-size: var(--font-size-sm);
  color: var(--color-gray-600);
}

.footer-section a:hover {
  color: var(--color-black);
}

.footer-bottom {
  margin-top: var(--space-8);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-gray-200);
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--color-gray-600);
}

/* Grid Layouts */
.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-cols-1 {
  grid-template-columns: 1fr;
}

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

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

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

/* Responsive Grid */
@media (min-width: 640px) {
  .grid-cols-sm-2 {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid-cols-sm-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-cols-lg-3 {
    grid-template-columns: repeat(3, 1fr);
  }
  .grid-cols-lg-4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Responsive Layout Utilities */
.layout-sidebar {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .layout-sidebar {
    grid-template-columns: 250px 1fr;
  }
}

.layout-two-column {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .layout-two-column {
    grid-template-columns: 1fr 1fr;
  }
}

.layout-main-aside {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .layout-main-aside {
    grid-template-columns: 1fr 400px;
  }
}

/* Form Layout Utilities */
.form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 640px) {
  .form-grid-2 {
    grid-template-columns: 1fr 1fr;
  }

  .form-grid-3 {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

/* Mobile-specific utilities */
@media (max-width: 767px) {
  .mobile-hide {
    display: none;
  }

  .mobile-full-width {
    width: 100%;
  }

  .mobile-no-sticky {
    position: static !important;
  }
}