/* ============================================
   LAYOUT - Page Structure & Grid Systems
   ============================================ */

/* ============================================
   GRID SYSTEMS
   ============================================ */

.grid {
  display: grid;
  gap: var(--spacing-xl);
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* Auto-fit responsive grid */
.grid-auto-fit {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
}

.grid-auto-fill {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--spacing-xl);
}

/* ============================================
   FLEX LAYOUTS
   ============================================ */

.flex {
  display: flex;
}

.flex-col {
  display: flex;
  flex-direction: column;
}

.flex-center {
  display: flex;
  justify-content: center;
  align-items: center;
}

.flex-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.flex-wrap {
  flex-wrap: wrap;
}

.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

/* ============================================
   SECTION LAYOUTS
   ============================================ */

/* Hero Section */
.hero {
  padding: var(--spacing-3xl) 0;
  min-height: calc(100vh - var(--header-height));
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, var(--background-color) 0%, var(--surface-color) 100%);
}

.hero-content {
  width: 100%;
}

/* Two-column layout */
.two-column {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-2xl);
  align-items: start;
}

.two-column-equal {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  align-items: start;
}

/* Three-column layout */
.three-column {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-2xl);
}

/* Sidebar layout */
.sidebar-layout {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: var(--spacing-2xl);
}

.sidebar-layout.sidebar-right {
  grid-template-columns: 1fr 250px;
}

/* ============================================
   CONTENT SECTIONS
   ============================================ */

.section {
  padding: var(--spacing-3xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-title {
  font-size: var(--text-3xl);
  color: var(--primary-color);
  margin-bottom: var(--spacing-md);
}

.section-subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto;
}

.section-divider {
  width: 60px;
  height: 4px;
  background-color: var(--accent-color);
  margin: var(--spacing-lg) auto;
  border-radius: 2px;
}

/* Alternating background sections */
.section-alt {
  background-color: var(--surface-color);
}

/* ============================================
   CONTENT WIDTH CONTAINERS
   ============================================ */

.content-narrow {
  max-width: 700px;
  margin: 0 auto;
}

.content-medium {
  max-width: 900px;
  margin: 0 auto;
}

.content-wide {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* ============================================
   LIST LAYOUTS
   ============================================ */

.list-grid {
  display: grid;
  gap: var(--spacing-lg);
}

.list-stack {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

/* ============================================
   SPECIAL LAYOUTS
   ============================================ */

/* Featured highlights layout */
.highlights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

/* Timeline layout */
.timeline {
  position: relative;
  padding-left: var(--spacing-2xl);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background-color: var(--border-color);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--spacing-xl);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--spacing-2xl) - 6px);
  top: 0;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--accent-color);
  border: 3px solid var(--background-color);
}

/* Stats/Metrics layout */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  text-align: center;
}

.stat-item {
  padding: var(--spacing-lg);
}

.stat-value {
  font-size: var(--text-4xl);
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* ============================================
   SPACING UTILITIES
   ============================================ */

.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }
.p-xl { padding: var(--spacing-xl); }
.p-2xl { padding: var(--spacing-2xl); }

.px-sm { padding-left: var(--spacing-sm); padding-right: var(--spacing-sm); }
.px-md { padding-left: var(--spacing-md); padding-right: var(--spacing-md); }
.px-lg { padding-left: var(--spacing-lg); padding-right: var(--spacing-lg); }
.px-xl { padding-left: var(--spacing-xl); padding-right: var(--spacing-xl); }

.py-sm { padding-top: var(--spacing-sm); padding-bottom: var(--spacing-sm); }
.py-md { padding-top: var(--spacing-md); padding-bottom: var(--spacing-md); }
.py-lg { padding-top: var(--spacing-lg); padding-bottom: var(--spacing-lg); }
.py-xl { padding-top: var(--spacing-xl); padding-bottom: var(--spacing-xl); }

.m-sm { margin: var(--spacing-sm); }
.m-md { margin: var(--spacing-md); }
.m-lg { margin: var(--spacing-lg); }
.m-xl { margin: var(--spacing-xl); }
.m-2xl { margin: var(--spacing-2xl); }

.mx-auto { margin-left: auto; margin-right: auto; }