/* ============================================
   LAYOUT - Page Structure & Navigation
   ============================================ */

/* Container */
.container {
  width: 100%;
  max-width: var(--container-2xl);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.container-sm { max-width: var(--container-sm); }
.container-md { max-width: var(--container-md); }
.container-lg { max-width: var(--container-lg); }
.container-xl { max-width: var(--container-xl); }

/* Site Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--neutral-200);
  box-shadow: none;
  transition: all var(--transition-slow);
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 8px 16px rgba(28, 28, 30, 0.08);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
  gap: var(--space-4);
}

/* Logo */
.logo-section {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--primary-blue);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-lg);
  color: #FFFFFF;
  font-weight: var(--font-semibold);
  flex-shrink: 0;
}

.logo-text {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--primary-blue);
}

/* Navigation */
.nav-links {
  display: flex;
  gap: var(--space-5);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  color: var(--neutral-700);
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  text-decoration: none;
  transition: color var(--transition-base);
  position: relative;
  padding: var(--space-2) 0;
}

.nav-link:hover {
  color: var(--primary-blue);
}

.nav-link:focus-visible {
  outline: 2px solid var(--primary-blue);
  outline-offset: 6px;
}

.nav-link.active {
  color: var(--primary-blue);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -20px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary-blue);
  border-radius: var(--radius-sm);
}

/* User Actions */
.user-actions {
  display: flex;
  gap: var(--space-2);
  align-items: center;
}

.user-profile {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-full);
  background: var(--neutral-100);
  cursor: pointer;
  transition: all var(--transition-base);
}

.user-profile:hover {
  background: var(--neutral-200);
}

.user-name {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--neutral-900);
}

/* Mobile Menu */
.mobile-menu-button {
  display: none;
  width: 40px;
  height: 40px;
  background: transparent;
  border: none;
  color: var(--neutral-700);
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: background var(--transition-base);
}

.mobile-menu-button:hover {
  background: var(--neutral-100);
}

.mobile-menu-button svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  fill: none;
  display: block;
}

.mobile-menu {
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  background: white;
  box-shadow: var(--shadow-xl);
  padding: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.3s ease-in-out, opacity 0.3s ease-in-out, padding 0.3s ease-in-out;
  z-index: 1025;
}

.mobile-menu.open,
.mobile-menu.active {
  max-height: 500px;
  opacity: 1;
  padding: var(--space-4);
}

.mobile-menu .nav-links {
  flex-direction: column;
  gap: 0;
}

.mobile-menu .nav-link {
  display: block;
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--neutral-200);
}

/* Main Content */
main {
  min-height: calc(100vh - 64px);
}

/* Section */
.section {
  padding: var(--space-12) 0;
}

.section-sm {
  padding: var(--space-8) 0;
}

.section-lg {
  padding: var(--space-16) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-8);
}

.section-title {
  font-size: var(--text-4xl);
  font-weight: var(--font-bold);
  color: var(--neutral-900);
  margin-bottom: var(--space-2);
  text-align: center;
}

.section-subtitle {
  font-size: var(--text-lg);
  color: var(--neutral-400);
  font-weight: var(--font-regular);
  text-align: center;
}

/* Grid Layouts */
.grid {
  display: grid;
  gap: var(--space-4);
}

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

.grid-auto {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* Flexbox Utilities */
.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.flex-center {
  justify-content: center;
  align-items: center;
}

.flex-between {
  justify-content: space-between;
  align-items: center;
}

.flex-wrap {
  flex-wrap: wrap;
}

.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }
.gap-6 { gap: var(--space-6); }

/* Site Footer */
.site-footer {
  background: var(--primary-blue);
  color: rgba(255, 255, 255, 0.85);
  padding: var(--space-12) 0 var(--space-6);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-8);
  margin-bottom: var(--space-8);
}

.footer-section h4 {
  color: #FFFFFF;
  font-size: var(--text-lg);
  margin-bottom: var(--space-4);
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

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

.footer-links a {
  color: rgba(255, 255, 255, 0.75);
  text-decoration: none;
  transition: color var(--transition-base);
}

.footer-links a:hover {
  color: #FFFFFF;
}

.footer-contact {
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: var(--space-2);
}

.footer-contact:last-of-type {
  margin-bottom: 0;
}

.footer-bottom {
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255, 255, 255, 0.25);
  text-align: center;
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.7);
}

/* Floating Widgets */
.floating-widget {
  position: fixed;
  bottom: var(--space-5);
  right: var(--space-4);
  z-index: var(--z-fixed);
  transition: all var(--transition-slow);
}

.floating-fab {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--success-500);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  box-shadow: var(--shadow-xl);
  cursor: pointer;
  transition: all var(--transition-base);
  border: none;
}

.floating-fab:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-2xl);
}

/* Skip to Content Link */
.skip-to-content {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--primary-blue);
  color: white;
  padding: var(--space-2) var(--space-4);
  z-index: 9999;
  border-radius: var(--radius-md);
  text-decoration: none;
}

.skip-to-content:focus {
  top: var(--space-2);
}

/* Responsive Design */
@media (max-width: 1024px) {
  .container {
    padding: 0 var(--space-3);
  }
  
  .grid-cols-4 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grid-cols-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .header-container {
    height: 56px;
  }
  
  .logo-text {
    font-size: var(--text-base);
  }
  
  /* Adjust mobile menu position to match mobile header height */
  .mobile-menu {
    top: 56px;
  }
  
  /* Hide desktop navigation on mobile */
  nav .nav-links {
    display: none;
  }
  
  /* Ensure mobile menu nav-links are visible when menu is open */
  .mobile-menu .nav-links {
    display: flex !important;
    flex-direction: column;
  }
  
  .mobile-menu.active .nav-links,
  .mobile-menu.open .nav-links {
    display: flex !important;
    flex-direction: column;
  }
  
  .mobile-menu {
    top: 56px;
  }
  
  .mobile-menu-button {
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .section {
    padding: var(--space-8) 0;
  }
  
  .section-lg {
    padding: var(--space-10) 0;
  }
  
  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
  
  .floating-widget {
    bottom: var(--space-4);
    right: var(--space-3);
  }
  
  .floating-fab {
    width: 56px;
    height: 56px;
    font-size: 24px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-2);
  }
  
  .section {
    padding: var(--space-6) 0;
  }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }

.w-full { width: 100%; }
.h-full { height: 100%; }

.mx-auto { margin-left: auto; margin-right: auto; }

.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.mt-0 { margin-top: 0; }
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }

.p-0 { padding: 0; }
.p-2 { padding: var(--space-2); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }

.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-full { border-radius: var(--radius-full); }

.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }