/* ============================================================================
   VIDEONEST UNIVERSAL NAVIGATION & FOOTER
   Include this CSS on all pages for consistent header/footer styling
   Follows videonest-design-system.css v2.0 guidelines
   ============================================================================ */

/* ============================================================================
   UNIVERSAL HEADER / NAVIGATION
   ============================================================================ */
.vn-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-gray-100);
  z-index: 1000;
  transition: all 0.12s ease;
  font-family: var(--font-family-primary);
}

.vn-header.scrolled {
  box-shadow: 0 1px 16px rgba(0,0,0,0.06);
}

.vn-header-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 var(--space-4);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

/* Logo */
.vn-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  flex-shrink: 0;
}

.vn-logo img {
  height: 24px;
}

.vn-logo-badge {
  background: var(--color-gray-100);
  color: var(--color-text-muted);
  font-size: 10px;
  font-weight: var(--font-weight-semibold);
  padding: 2px 6px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

/* Primary Navigation */
.vn-nav {
  display: flex;
  align-items: center;
  gap: var(--space-0-5);
}

.vn-nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-1-5);
  padding: var(--space-1-5) var(--space-2-5);
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: 6px;
  transition: all 0.12s ease;
  white-space: nowrap;
  letter-spacing: var(--letter-spacing-normal);
}

.vn-nav-link:hover {
  color: var(--color-text-primary);
  background: var(--color-gray-50);
}

.vn-nav-link.active {
  color: var(--color-accent);
  background: var(--color-accent-light);
}

.vn-nav-link svg {
  width: 16px;
  height: 16px;
  opacity: 0.7;
}

.vn-nav-link.active svg {
  opacity: 1;
}

/* Nav Dropdown */
.vn-nav-dropdown {
  position: relative;
}

.vn-nav-dropdown-toggle {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1-5) var(--space-2-5);
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  background: transparent;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.12s ease;
  letter-spacing: var(--letter-spacing-normal);
}

.vn-nav-dropdown-toggle:hover {
  color: var(--color-text-primary);
  background: var(--color-gray-50);
}

.vn-nav-dropdown-toggle svg {
  width: 16px;
  height: 16px;
  transition: transform 0.12s ease;
}

.vn-nav-dropdown:hover .vn-nav-dropdown-toggle svg:last-child {
  transform: rotate(180deg);
}

.vn-nav-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  padding: var(--space-1-5);
  background: var(--color-white);
  border: 1px solid var(--color-gray-100);
  border-radius: 8px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.12);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all 0.12s ease;
  z-index: 100;
}

.vn-nav-dropdown:hover .vn-nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(4px);
}

.vn-nav-dropdown-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-2-5);
  text-decoration: none;
  border-radius: 6px;
  transition: background 0.12s ease;
}

.vn-nav-dropdown-item:hover {
  background: var(--color-gray-50);
}

.vn-nav-dropdown-item-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-light);
  color: var(--color-accent);
  border-radius: 8px;
  flex-shrink: 0;
}

.vn-nav-dropdown-item-icon svg {
  width: 16px;
  height: 16px;
}

.vn-nav-dropdown-item-content {
  flex: 1;
  min-width: 0;
}

.vn-nav-dropdown-item-title {
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  margin-bottom: 2px;
}

.vn-nav-dropdown-item-desc {
  font-size: 12px;
  color: var(--color-text-muted);
  line-height: 1.4;
}

.vn-nav-dropdown-divider {
  height: 1px;
  background: var(--color-gray-100);
  margin: var(--space-2) 0;
}

/* Header Actions */
.vn-header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.vn-header-login {
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 0.12s ease;
  letter-spacing: var(--letter-spacing-normal);
}

.vn-header-login:hover {
  color: var(--color-text-primary);
}

.vn-header-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1-5);
  padding: var(--space-1-5) var(--space-3);
  font-size: var(--font-size-small);
  font-weight: var(--font-weight-medium);
  color: var(--color-white);
  background: var(--color-accent);
  border-radius: 6px;
  text-decoration: none;
  transition: all 0.12s ease;
  letter-spacing: var(--letter-spacing-normal);
}

.vn-header-cta:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(255, 107, 53, 0.25);
}

.vn-header-cta svg {
  width: 14px;
  height: 14px;
}

/* Mobile Menu Toggle */
.vn-mobile-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  color: var(--color-text-primary);
}

.vn-mobile-toggle:hover {
  background: var(--color-gray-50);
}

.vn-mobile-toggle svg {
  width: 22px;
  height: 22px;
}

/* ============================================================================
   UNIVERSAL FOOTER
   ============================================================================ */
.vn-footer {
  background: var(--color-gray-900);
  color: var(--color-white);
  padding: var(--space-10) 0 var(--space-6);
  font-family: var(--font-family-primary);
}

.vn-footer-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.vn-footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(4, 1fr);
  gap: var(--space-8);
  padding-bottom: var(--space-8);
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.vn-footer-brand {
  max-width: 260px;
}

.vn-footer-logo {
  height: 22px;
  filter: brightness(0) invert(1);
  margin-bottom: var(--space-4);
}

.vn-footer-brand p {
  font-size: var(--font-size-small);
  color: rgba(255,255,255,0.6);
  line-height: var(--line-height-relaxed);
  letter-spacing: var(--letter-spacing-normal);
  margin: 0;
}

.vn-footer-column h4 {
  font-size: var(--font-size-xsmall);
  font-weight: var(--font-weight-semibold);
  color: var(--color-white);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wider);
  margin: 0 0 var(--space-4);
}

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

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

.vn-footer-links a {
  font-size: var(--font-size-small);
  color: rgba(255,255,255,0.6);
  text-decoration: none;
  transition: color 0.12s ease;
  letter-spacing: var(--letter-spacing-normal);
}

.vn-footer-links a:hover {
  color: var(--color-white);
}

.vn-footer-links a.highlight {
  color: var(--color-accent);
}

.vn-footer-links a.highlight:hover {
  color: #ff8c5a;
}

.vn-footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-6);
  flex-wrap: wrap;
  gap: var(--space-4);
}

.vn-footer-copyright {
  font-size: var(--font-size-small);
  color: rgba(255,255,255,0.4);
  letter-spacing: var(--letter-spacing-normal);
}

.vn-footer-social {
  display: flex;
  gap: var(--space-4);
}

.vn-footer-social a {
  color: rgba(255,255,255,0.4);
  transition: color 0.12s ease;
}

.vn-footer-social a:hover {
  color: var(--color-white);
}

.vn-footer-social svg {
  width: 18px;
  height: 18px;
}

/* ============================================================================
   PAGE CONTENT OFFSET (for fixed header)
   ============================================================================ */
.vn-page-content {
  padding-top: 64px;
}

/* ============================================================================
   BREADCRUMBS
   ============================================================================ */
.vn-breadcrumbs {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) 0;
  font-size: var(--font-size-small);
}

.vn-breadcrumb-link {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color 0.15s ease;
}

.vn-breadcrumb-link:hover {
  color: var(--color-accent);
}

.vn-breadcrumb-separator {
  color: var(--color-gray-300);
}

.vn-breadcrumb-current {
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
}

/* ============================================================================
   ANCHOR LINKS (for SEO)
   ============================================================================ */
.vn-anchor {
  scroll-margin-top: 80px;
}

.vn-section-anchor {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: inherit;
  text-decoration: none;
}

.vn-section-anchor:hover .vn-anchor-icon {
  opacity: 1;
}

.vn-anchor-icon {
  color: var(--color-accent);
  opacity: 0;
  transition: opacity 0.15s ease;
}

.vn-anchor-icon svg {
  width: 18px;
  height: 18px;
}

/* ============================================================================
   CROSS-LINK CARDS
   ============================================================================ */
.vn-crosslinks {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-4);
  margin: var(--space-6) 0;
}

.vn-crosslink-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-gray-50);
  border: 1px solid var(--color-gray-100);
  border-radius: 8px;
  text-decoration: none;
  transition: all 0.12s ease;
}

.vn-crosslink-card:hover {
  background: var(--color-white);
  border-color: var(--color-gray-200);
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
  transform: translateY(-2px);
}

.vn-crosslink-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-light);
  color: var(--color-accent);
  border-radius: 8px;
  flex-shrink: 0;
}

.vn-crosslink-icon svg {
  width: 18px;
  height: 18px;
}

.vn-crosslink-content {
  flex: 1;
  min-width: 0;
}

.vn-crosslink-title {
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-1);
  letter-spacing: var(--letter-spacing-tight);
}

.vn-crosslink-desc {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  line-height: var(--line-height-normal);
  letter-spacing: var(--letter-spacing-normal);
}

.vn-crosslink-arrow {
  color: var(--color-gray-400);
  transition: transform 0.12s ease;
}

.vn-crosslink-card:hover .vn-crosslink-arrow {
  transform: translateX(4px);
  color: var(--color-accent);
}

.vn-crosslink-arrow svg {
  width: 16px;
  height: 16px;
}

/* ============================================================================
   IN-PAGE NAVIGATION (Table of Contents)
   ============================================================================ */
.vn-toc {
  position: sticky;
  top: 80px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  padding: var(--space-4);
  background: var(--color-gray-50);
  border-radius: 8px;
}

.vn-toc-title {
  font-size: var(--font-size-xsmall);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wider);
  margin-bottom: var(--space-3);
}

.vn-toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.vn-toc-list li {
  margin-bottom: var(--space-0-5);
}

.vn-toc-link {
  display: block;
  padding: var(--space-1-5) var(--space-2);
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: 4px;
  border-left: 2px solid transparent;
  margin-left: -2px;
  transition: all 0.12s ease;
  letter-spacing: var(--letter-spacing-normal);
}

.vn-toc-link:hover {
  color: var(--color-text-primary);
  background: var(--color-white);
}

.vn-toc-link.active {
  color: var(--color-accent);
  border-left-color: var(--color-accent);
  background: var(--color-accent-light);
}

.vn-toc-link.nested {
  padding-left: var(--space-5);
  font-size: var(--font-size-small);
}

/* ============================================================================
   RESPONSIVE
   ============================================================================ */
@media (max-width: 1024px) {
  .vn-footer-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .vn-footer-brand {
    grid-column: 1 / -1;
    max-width: none;
    margin-bottom: var(--space-4);
  }
}

@media (max-width: 768px) {
  .vn-header {
    height: 56px;
  }

  .vn-page-content {
    padding-top: 56px;
  }

  .vn-nav {
    display: none;
  }

  .vn-mobile-toggle {
    display: flex;
  }

  .vn-header-login {
    display: none;
  }

  .vn-footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
  }

  .vn-footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .vn-crosslinks {
    grid-template-columns: 1fr;
  }

  .vn-toc {
    position: static;
    max-height: none;
    margin-bottom: var(--space-6);
  }

  .vn-anchor {
    scroll-margin-top: 72px;
  }
}

/* ============================================================================
   UTILITIES
   ============================================================================ */
.vn-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}