/* ==========================================================================
   Tools Hub - Layout Styles (Header, Nav, Dropdown, Footer, Containers)
   ========================================================================== */

body {
  background-color: var(--bg-main);
  color: var(--text-main);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

.site-main {
  flex: 1 0 auto;
  width: 100%;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

@media (max-width: 640px) {
  .container {
    padding-left: 1rem;
    padding-right: 1rem;
  }
}

/* --------------------------------------------------------------------------
   Sticky Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--header-height);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background-color: rgba(255, 255, 255, 0.9);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

[data-theme="dark"] .site-header {
  background-color: rgba(19, 30, 53, 0.9);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 1.5rem;
}

/* Brand Logo */
.brand-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-main);
  text-decoration: none;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
}

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

.brand-icon svg {
  width: 20px;
  height: 20px;
}

.brand-title {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-tagline {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.02em;
}

/* Desktop Navigation Menu */
.desktop-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

@media (max-width: 900px) {
  .desktop-nav {
    display: none;
  }
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 0.85rem;
  font-size: 0.925rem;
  font-weight: 600;
  color: var(--text-muted);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

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

.nav-dropdown-trigger {
  position: relative;
}

.nav-link svg.chevron-icon {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}

.nav-dropdown-trigger.open .nav-link svg.chevron-icon {
  transform: rotate(180deg);
}

/* Mega Dropdown Menu for Tools */
.mega-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  width: 860px;
  max-width: calc(100vw - 32px);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  box-shadow: var(--shadow-xl);
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  z-index: 1050;
}

.nav-dropdown-trigger.open .mega-dropdown {
  visibility: visible;
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.dropdown-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.dropdown-category {
  display: flex;
  flex-direction: column;
}

.dropdown-cat-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--primary);
  padding-bottom: 0.5rem;
  margin-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.dropdown-cat-header svg {
  width: 14px;
  height: 14px;
}

.dropdown-tool-list {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.dropdown-tool-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.6rem;
  font-size: 0.875rem;
  color: var(--text-main);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.dropdown-tool-link:hover {
  background-color: var(--primary-light);
  color: var(--primary);
}

.dropdown-tool-link svg {
  width: 14px;
  height: 14px;
  color: var(--text-muted);
  flex-shrink: 0;
}

.dropdown-tool-link:hover svg {
  color: var(--primary);
}

/* Header Action Controls (Theme Toggle & Mobile Hamburger) */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.theme-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-surface-elevated);
  color: var(--text-main);
  transition: all var(--transition-fast);
}

.theme-toggle-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-1px);
}

.theme-toggle-btn svg {
  width: 20px;
  height: 20px;
}

.mobile-menu-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: var(--bg-surface-elevated);
  color: var(--text-main);
  cursor: pointer;
}

@media (max-width: 900px) {
  .mobile-menu-btn {
    display: flex;
  }
}

.mobile-menu-btn svg {
  width: 22px;
  height: 22px;
}

/* Mobile Drawer Navigation */
.mobile-nav-drawer {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg-surface);
  overflow-y: auto;
  padding: 1.5rem;
  z-index: 999;
  display: none;
  border-top: 1px solid var(--border-color);
}

.mobile-nav-drawer.open {
  display: block;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.mobile-nav-item > a {
  display: block;
  padding: 0.75rem 1rem;
  font-size: 1.05rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  color: var(--text-main);
}

.mobile-nav-item > a:hover {
  background-color: var(--primary-light);
  color: var(--primary);
}

.mobile-category-group {
  margin-top: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.mobile-category-header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1rem;
  font-weight: 700;
  font-size: 0.95rem;
  background: var(--bg-surface-elevated);
  color: var(--text-main);
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
}

.mobile-category-tools {
  display: none;
  padding: 0.5rem;
  background: var(--bg-surface);
}

.mobile-category-tools.open {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.25rem;
}

.mobile-tool-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0.85rem;
  font-size: 0.9rem;
  border-radius: var(--radius-sm);
  color: var(--text-main);
}

.mobile-tool-link:hover {
  background: var(--primary-light);
  color: var(--primary);
}

/* --------------------------------------------------------------------------
   Breadcrumb Navigation
   -------------------------------------------------------------------------- */
.breadcrumb-nav {
  padding: 1.25rem 0 0.5rem 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.breadcrumb-item a {
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

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

.breadcrumb-item.active {
  color: var(--text-main);
  font-weight: 600;
}

.breadcrumb-separator {
  color: var(--text-subtle);
  font-size: 0.8rem;
}

/* --------------------------------------------------------------------------
   Site Footer
   -------------------------------------------------------------------------- */
.site-footer {
  margin-top: auto;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  padding: 4rem 0 2rem 0;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.2fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 640px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

.footer-col h3,
.footer-col .footer-col-title {
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-main);
  margin-bottom: 1.25rem;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.6;
  margin-top: 0.75rem;
  max-width: 320px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  transition: color var(--transition-fast), transform var(--transition-fast);
  display: inline-block;
}

.footer-links a:hover {
  color: var(--primary);
  transform: translateX(2px);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-bottom a {
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

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