/* ==========================================
   LOCATRIA GLOBAL DESIGN SYSTEM - GLOBAL & LAYOUT
   ========================================== */

/* --- CSS RESET & BASE --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  color-scheme: light;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  color: var(--color-text-body);
  background-color: var(--color-bg-body);
  background-image: linear-gradient(to bottom, var(--color-bg-surface) 0%, var(--color-bg-body) 300px);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* --- ACCESSIBILITY SKIP LINK --- */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-4);
  background: var(--color-primary-900);
  color: var(--color-text-inverse);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  font-weight: var(--weight-semibold);
  font-size: var(--text-sm);
  z-index: 1000;
  transition: top var(--transition-fast);
  text-decoration: none;
  box-shadow: var(--shadow-md);
}

.skip-link:focus {
  top: var(--space-4);
  outline: 3px solid var(--color-primary-500);
  outline-offset: 2px;
}

/* --- FOCUS OUTLINE (WCAG AA COMPLIANT) --- */
:focus-visible {
  outline: 2px solid var(--color-focus-outline);
  outline-offset: 2px;
}

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

/* --- TYPOGRAPHY HIERARCHY --- */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text-main);
  font-weight: var(--weight-bold);
  line-height: var(--leading-tight);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-4);
}

h1 {
  font-size: var(--text-4xl);
  font-weight: 800;
}

h2 {
  font-size: var(--text-2xl);
  margin-top: var(--space-8);
}

h3 {
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
  margin-top: var(--space-6);
}

h4 {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
}

h5, h6 {
  font-size: var(--text-base);
  font-weight: var(--weight-medium);
}

p {
  margin-bottom: var(--space-4);
  max-width: var(--reading-max-width);
}

a {
  color: var(--color-primary-500);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-600);
  text-decoration: underline;
  text-underline-offset: 3px;
}

ul, ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

li {
  margin-bottom: var(--space-2);
}

img, svg, video {
  max-width: 100%;
  height: auto;
  display: block;
}

hr {
  border: 0;
  height: 1px;
  background-color: var(--color-border-subtle);
  margin: var(--space-8) 0;
}

/* --- LAYOUT CONTAINERS --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-6);
  padding-right: var(--space-6);
}

/* Standard Page Body Container */
.page-wrapper {
  flex: 1 0 auto;
  display: flex;
  flex-direction: column;
}

/* Layout Variant 1: Main Content + Sidebar (Knowledge Hub Style) */
.layout-with-sidebar {
  display: grid;
  align-items: start;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  padding-top: var(--space-8);
  padding-bottom: var(--space-16);
}

@media (min-width: 1024px) {
  .layout-with-sidebar {
    grid-template-columns: 1fr var(--sidebar-width);
    gap: var(--space-12);
  }
}

/* Layout Variant 2: Sidebar Left + Content Right */
.layout-sidebar-left {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  padding-top: var(--space-8);
  padding-bottom: var(--space-16);
}

@media (min-width: 1024px) {
  .layout-sidebar-left {
    grid-template-columns: var(--sidebar-width) 1fr;
    gap: var(--space-12);
  }
}

/* Layout Variant 3: Full Width Container (Homepage / Hub Index) */
.layout-full-width {
  padding-top: var(--space-8);
  padding-bottom: var(--space-16);
}

/* Content Reader Max Width Utility */
.reading-container {
  max-width: var(--reading-max-width);
}