/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

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

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

.section-lg {
  padding: 6rem 0;
}

/* Grid System */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

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

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

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

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

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

.gap-xs { gap: var(--spacing-xs); }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

/* Spacing Utilities */
.mt-xs { margin-top: var(--spacing-xs); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mt-2xl { margin-top: var(--spacing-2xl); }

.mb-xs { margin-bottom: var(--spacing-xs); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.mb-2xl { margin-bottom: var(--spacing-2xl); }

.py-sm { padding-top: var(--spacing-sm); padding-bottom: var(--spacing-sm); }
.py-md { padding-top: var(--spacing-md); padding-bottom: var(--spacing-md); }
.py-lg { padding-top: var(--spacing-lg); padding-bottom: var(--spacing-lg); }
.py-xl { padding-top: var(--spacing-xl); padding-bottom: var(--spacing-xl); }

.px-sm { padding-left: var(--spacing-sm); padding-right: var(--spacing-sm); }
.px-md { padding-left: var(--spacing-md); padding-right: var(--spacing-md); }
.px-lg { padding-left: var(--spacing-lg); padding-right: var(--spacing-lg); }

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  background-color: transparent;
  transition: all var(--transition-base);
}

.header.scrolled {
  background: linear-gradient(135deg, rgba(26, 26, 26, 0.95) 0%, rgba(20, 20, 20, 0.98) 100%);
  backdrop-filter: blur(20px);
  box-shadow:
    0 4px 20px rgba(0, 0, 0, 0.3),
    0 0 0 1px rgba(126, 156, 160, 0.1);
  border-bottom: 1px solid rgba(126, 156, 160, 0.1);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-sm) var(--container-padding);
  max-width: var(--container-max-width);
  margin: 0 auto;
}

/* Navigation */
.nav-list {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.nav-link {
  color: var(--color-foreground);
  font-weight: 500;
  font-size: 0.9375rem;
  transition: all var(--transition-base);
  position: relative;
  padding: 0.5rem 0;
}

.nav-link:hover {
  color: var(--color-accent);
  text-shadow: 0 0 8px rgba(126, 156, 160, 0.3);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  transition: width var(--transition-base);
  box-shadow: 0 0 8px rgba(126, 156, 160, 0.5);
}

.nav-link:hover::after {
  width: 100%;
}

/* Mobile Menu */
.mobile-menu-toggle {
  display: none;
  color: var(--color-foreground);
  padding: 0.5rem;
  background: transparent;
  border: 1px solid rgba(126, 156, 160, 0.2);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.mobile-menu-toggle:hover {
  background: rgba(126, 156, 160, 0.1);
  border-color: var(--color-accent);
  box-shadow: 0 0 12px rgba(126, 156, 160, 0.2);
}

.mobile-nav {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(180deg, rgba(26, 26, 26, 0.98) 0%, rgba(15, 15, 15, 0.99) 100%);
  backdrop-filter: blur(20px);
  z-index: var(--z-modal);
  padding: var(--spacing-2xl) var(--container-padding);
  overflow-y: auto;
}

.mobile-nav.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.mobile-nav-link {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-foreground);
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid rgba(126, 156, 160, 0.1);
  transition: all var(--transition-base);
  position: relative;
  padding-left: var(--spacing-md);
}

.mobile-nav-link::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), transparent);
  transition: width var(--transition-base);
}

.mobile-nav-link:hover {
  color: var(--color-accent);
  padding-left: var(--spacing-lg);
  text-shadow: 0 0 12px rgba(126, 156, 160, 0.4);
}

.mobile-nav-link:hover::before {
  width: var(--spacing-md);
}

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

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

/* Footer */
.footer {
  background: linear-gradient(180deg, rgba(26, 26, 26, 0.95) 0%, rgba(15, 15, 15, 1) 100%);
  border-top: 1px solid rgba(126, 156, 160, 0.2);
  padding: var(--spacing-3xl) 0 var(--spacing-lg);
  position: relative;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(126, 156, 160, 0.5), transparent);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
  font-size: 1rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-foreground);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.footer-link {
  color: var(--color-muted-foreground);
  font-size: 0.9375rem;
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.footer-copyright {
  color: var(--color-muted-foreground);
  font-size: 0.875rem;
}

.social-links {
  display: flex;
  gap: var(--spacing-md);
}

.social-link {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(32, 32, 32, 0.8) 0%, rgba(26, 26, 26, 0.9) 100%);
  border: 1px solid rgba(126, 156, 160, 0.2);
  color: var(--color-foreground);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.social-link::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-primary) 100%);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.social-link:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow:
    0 8px 20px rgba(126, 156, 160, 0.3),
    0 0 0 1px rgba(126, 156, 160, 0.2);
}

.social-link:hover::before {
  opacity: 1;
}

.social-link svg {
  position: relative;
  z-index: 1;
  transition: all var(--transition-base);
}

.social-link:hover svg {
  color: var(--color-background);
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}

@media (max-width: 768px) {
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}