/* 
 * assets/css/layout.css
 * Core structural layouts (Container, Header, Footer, Sections, Grids)
 */

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

section {
  padding-top: var(--space-xl);
  padding-bottom: var(--space-xl);
}

section.no-pt { padding-top: 0; }
section.no-pb { padding-bottom: 0; }

.section-header {
  text-align: center;
  margin-bottom: var(--space-lg);
  max-width: 800px;
  margin-inline: auto;
}

/* Smart Sticky Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 100;
  display: flex;
  align-items: center;
  transition: transform var(--transition-normal), background-color var(--transition-normal);
}

.site-header.scrolled {
  background-color: rgba(247, 245, 240, 0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.site-header.scroll-down {
  transform: translateY(-100%);
}

.site-header.scroll-up {
  transform: translateY(0);
}

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

.brand {
  font-family: var(--font-family-headings);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-primary);
  z-index: 101;
}

.main-nav ul {
  display: flex;
  gap: var(--space-md);
}

.main-nav a {
  font-size: 0.875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary);
  position: relative;
  padding: var(--space-xs) 0;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width var(--transition-normal);
}

.main-nav a:hover::after,
.main-nav a.active::after {
  width: 100%;
}

/* Footer */
.site-footer {
  background-color: var(--color-primary);
  color: var(--color-bg-base);
  padding-top: var(--space-xl);
  padding-bottom: var(--space-md);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.footer-col h4 {
  color: var(--color-white);
  margin-bottom: var(--space-md);
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.footer-col a {
  color: #A0AEC0;
}

.footer-col a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: var(--space-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  color: #A0AEC0;
}

.footer-bottom-links {
  display: flex;
  gap: var(--space-md);
}

/* Grids */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-lg); }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: var(--space-md); }
.grid-4 { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: var(--space-md); }

/* Overlapping Image Gallery for rich visual sections */
.image-overlap-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  align-items: center;
  gap: var(--space-sm);
}

.image-overlap-1 {
  grid-column: 1 / 9;
  grid-row: 1;
  z-index: 1;
}

.image-overlap-2 {
  grid-column: 6 / 13;
  grid-row: 1;
  z-index: 2;
  margin-top: 20%;
}

.image-overlap-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-md);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* Hero Section Split Layout */
.hero-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 100vh;
  align-items: center;
  gap: var(--space-xl);
}

.hero-text-area {
  padding-top: calc(var(--header-height) + var(--space-xl));
  padding-bottom: var(--space-xl);
  padding-right: var(--space-md);
}

.hero-image-area {
  height: 100vh;
  position: relative;
  overflow: hidden;
}

.hero-image-area img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@media (max-width: 992px) {
  .hero-split { grid-template-columns: 1fr; gap: 0; }
  .hero-image-area { height: 50vh; order: -1; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .main-nav { display: none; }
  .footer-bottom { flex-direction: column; gap: var(--space-sm); text-align: center; }
  .image-overlap-1 { grid-column: 1 / -1; margin-bottom: -10%; }
  .image-overlap-2 { grid-column: 3 / -1; margin-top: 0; }
}