/* ==========================================================================
   FileToolKit - Layout Styles (Header, Mega Menu, Nav, Footer, Grid)
   ========================================================================== */

/* Main Site Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background-color: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  height: var(--header-height);
  display: flex;
  align-items: center;
  transition: all var(--transition-normal);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

/* Brand Logo */
.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  font-weight: var(--font-weight-extrabold);
  font-size: 1.35rem;
  color: var(--text-primary);
  letter-spacing: -0.03em;
}

.brand-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--emerald-primary) 0%, var(--emerald-dark) 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
  box-shadow: 0 4px 10px rgba(22, 163, 106, 0.3);
}

.brand-icon svg {
  width: 22px;
  height: 22px;
}

.brand-text {
  display: flex;
  align-items: center;
}

.brand-text span {
  color: var(--emerald-primary);
}

/* Desktop Navigation */
.main-nav {
  display: none;
}

@media (min-width: 992px) {
  .main-nav {
    display: flex;
    align-items: center;
    gap: var(--space-1);
  }
}

.nav-link {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--text-secondary);
  padding: 0.6rem 0.9rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.nav-link:hover, .nav-link.active {
  color: var(--emerald-primary);
  background-color: var(--emerald-tint);
}

/* Mega Menu Trigger & Container */
.has-mega-menu {
  position: relative;
}

.mega-menu {
  position: absolute;
  top: 100%;
  margin-top: 6px;
  left: 50%;
  transform: translateX(-50%) translateY(6px);
  width: 860px;
  max-width: calc(100vw - 32px);
  max-height: calc(100vh - 85px);
  overflow-y: auto;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: 0 16px 40px -8px rgba(0, 0, 0, 0.25), 0 0 0 1px var(--border-color);
  padding: var(--space-6);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  z-index: 1040;
}

/* Invisible Hover Bridge: Prevents gap hover loss when moving mouse down */
.mega-menu::before {
  content: '';
  position: absolute;
  top: -14px;
  left: 0;
  right: 0;
  height: 14px;
  background: transparent;
}

/* Clean Custom Scrollbar for Mega Menu on smaller screens */
.mega-menu::-webkit-scrollbar {
  width: 6px;
}
.mega-menu::-webkit-scrollbar-track {
  background: transparent;
}
.mega-menu::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: var(--radius-full);
}

.has-mega-menu:hover .mega-menu,
.has-mega-menu.is-open .mega-menu,
.has-mega-menu:focus-within .mega-menu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.mega-menu-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

.mega-col-title {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--emerald-primary);
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.mega-tool-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.mega-tool-item a {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  padding: 0.35rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.mega-tool-item a:hover {
  color: var(--emerald-primary);
  background-color: var(--bg-muted);
  transform: translateX(3px);
}

.mega-menu-footer {
  margin-top: var(--space-5);
  padding-top: var(--space-4);
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.search-trigger-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  background-color: var(--bg-muted);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-full);
  padding: 0.45rem 0.85rem;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.search-trigger-btn:hover {
  border-color: var(--emerald-border);
  color: var(--text-primary);
  background-color: var(--bg-card);
}

.search-shortcut-badge {
  font-size: 0.7rem;
  font-family: var(--font-mono);
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xs);
  padding: 0.1rem 0.35rem;
  color: var(--text-muted);
}

/* Theme Toggle Button */
.theme-toggle-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  background-color: var(--bg-card);
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  color: var(--emerald-primary);
  border-color: var(--emerald-border);
  background-color: var(--emerald-tint);
}

.theme-toggle-btn svg {
  width: 18px;
  height: 18px;
}

.icon-sun { display: none; }
.icon-moon { display: block; }
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }

/* Mobile Menu Toggle */
.mobile-nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  cursor: pointer;
}

@media (min-width: 992px) {
  .mobile-nav-toggle {
    display: none;
  }
}

/* Mobile Drawer & Accordion */
.mobile-drawer {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--bg-card);
  z-index: var(--z-modal);
  padding: var(--space-4);
  overflow-y: auto;
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  transition: transform var(--transition-normal), opacity var(--transition-normal), visibility var(--transition-normal);
  border-bottom: 1px solid var(--border-color);
}

.mobile-drawer.open {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.mobile-accordion-item {
  border-bottom: 1px solid var(--border-color);
  margin-bottom: var(--space-2);
}

.mobile-accordion-header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) 0;
  background: none;
  border: none;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  cursor: pointer;
  text-align: left;
}

.mobile-accordion-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal) ease-out;
  padding-left: var(--space-2);
}

.mobile-accordion-item.active .mobile-accordion-body {
  max-height: 500px;
  padding-bottom: var(--space-3);
}

.mobile-tool-link {
  display: block;
  padding: 0.4rem 0;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

/* Breadcrumbs */
.breadcrumbs-bar {
  background-color: var(--bg-muted);
  border-bottom: 1px solid var(--border-color);
  padding: var(--space-2) 0;
  font-size: var(--font-size-xs);
}

.breadcrumbs-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  list-style: none;
}

.breadcrumbs-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--text-secondary);
}

.breadcrumbs-item a {
  color: var(--text-secondary);
}

.breadcrumbs-item a:hover {
  color: var(--emerald-primary);
}

.breadcrumbs-item.active {
  color: var(--text-primary);
  font-weight: var(--font-weight-semibold);
}

.breadcrumbs-separator {
  color: var(--text-muted);
}

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

@media (min-width: 768px) {
  .section {
    padding-top: var(--space-16);
    padding-bottom: var(--space-16);
  }
}

.section-muted {
  background-color: var(--bg-muted);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto var(--space-10) auto;
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
}

/* Site Footer */
.site-footer {
  margin-top: auto;
  background-color: var(--dark-surface);
  color: #A0ABA5;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: var(--space-16);
  padding-bottom: var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: var(--space-8);
  margin-bottom: var(--space-12);
}

@media (min-width: 576px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 992px) {
  .footer-grid {
    grid-template-columns: 2fr repeat(4, 1fr);
  }
}

.footer-brand-col p {
  color: #83918B;
  font-size: var(--font-size-sm);
  max-width: 320px;
  margin-top: var(--space-3);
}

.footer-heading {
  color: #FFFFFF;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-4);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-links a {
  color: #8E9D96;
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--emerald-primary);
}

.footer-bottom {
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  align-items: center;
  justify-content: space-between;
  font-size: var(--font-size-xs);
  color: #6C7A74;
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
  }
}

.footer-legal-links {
  display: flex;
  gap: var(--space-4);
}

.footer-legal-links a {
  color: #8E9D96;
}

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