/* ==========================================================================
   AtoZToolbox — Global Styles & Layout
   ========================================================================== */

body {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-main);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Accessibility: Skip Link */
.skip-link {
  position: absolute;
  top: -999px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary);
  color: #ffffff;
  padding: var(--space-2) var(--space-4);
  z-index: 10000;
  border-radius: var(--radius-sm);
  font-weight: 600;
  text-decoration: none;
  box-shadow: var(--shadow-lg);
}

.skip-link:focus {
  top: var(--space-4);
  outline: none;
}

/* Focus styles */
:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

/* Container */
.container {
  width: 100%;
  max-width: var(--max-w-content);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.tool-container {
  width: 100%;
  max-width: var(--max-w-tool);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

.reading-container {
  width: 100%;
  max-width: var(--max-w-reading);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
}

/* Header & Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  backdrop-filter: blur(8px);
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: var(--space-4);
}

/* Brand Logo */
.site-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-main);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 1.05rem;
  box-shadow: var(--shadow-sm);
}

.brand-accent {
  color: var(--primary);
}

/* Desktop Navigation */
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  padding: var(--space-2) var(--space-3);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

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

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

.search-trigger {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  transition: all var(--transition-fast);
}

.search-trigger:hover {
  background-color: var(--bg-muted);
  color: var(--text-main);
  border-color: var(--border-main);
}

.search-kbd {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-main);
  border-radius: var(--radius-xs);
  padding: 1px 5px;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.theme-toggle,
.mobile-menu-toggle {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background-color: var(--bg-subtle);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.theme-toggle:hover,
.mobile-menu-toggle:hover {
  background-color: var(--bg-muted);
  color: var(--text-main);
}

.mobile-menu-toggle {
  display: none;
}

/* Mobile Drawer */
.mobile-drawer {
  display: none;
  position: fixed;
  inset: 68px 0 0 0;
  background-color: var(--bg-surface);
  z-index: 999;
  padding: var(--space-6);
  flex-direction: column;
  gap: var(--space-3);
  overflow-y: auto;
  border-top: 1px solid var(--border-subtle);
}

.mobile-drawer.open {
  display: flex;
}

.mobile-nav-link {
  font-size: 1.1rem;
  font-weight: 600;
  padding: var(--space-3);
  border-radius: var(--radius-md);
  color: var(--text-main);
}

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

/* Main Content Area */
.site-main {
  flex: 1;
}

/* Footer */
.site-footer {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  padding-top: var(--space-12);
  padding-bottom: var(--space-8);
  margin-top: var(--space-16);
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-10);
}

.footer-brand-col p {
  margin-top: var(--space-3);
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 340px;
}

.footer-heading {
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-main);
  margin-bottom: var(--space-4);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-link {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-subtle);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
  font-size: 0.85rem;
  color: var(--text-muted);
}

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

/* Visually Hidden */
.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;
}