/* ====================================================
   Layout & Structure (Header, Footer, Containers)
   ==================================================== */

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.container-narrow {
  max-width: 800px;
}

.page-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding-top: calc(72px + var(--neptune-banner-height, 0px));
}

.section {
  padding: var(--space-16) 0;
}

/* ====================================================
   Grid System
   ==================================================== */
.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1024px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* ====================================================
   Header
   ==================================================== */
.header {
  position: fixed;
  top: var(--neptune-banner-height, 0px); left: 0; right: 0;
  height: 72px;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--border-subtle);
  z-index: var(--z-sticky);
  transition: box-shadow var(--transition-fast), background var(--transition-fast);
}

.header.scrolled {
  box-shadow: var(--shadow-sm);
  background: rgba(255, 255, 255, 0.98);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  height: 100%;
  padding: 0 var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--text-primary);
  font-weight: var(--font-extrabold);
  font-size: var(--text-xl);
}
.logo-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}
.logo-text span {
  color: var(--color-primary);
}

.nav {
  display: flex;
  gap: var(--space-6);
}

.nav-link {
  color: var(--text-secondary);
  font-weight: var(--font-medium);
  font-size: var(--text-sm);
  transition: color var(--transition-fast);
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  margin-bottom: 5px;
  border-radius: 2px;
  transition: all var(--transition-fast);
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 72px;
  left: 0; right: 0;
  background: var(--bg-base);
  border-bottom: 1px solid var(--border-primary);
  padding: var(--space-4);
  flex-direction: column;
  gap: var(--space-4);
  z-index: var(--z-sticky);
  box-shadow: var(--shadow-md);
}
.mobile-menu.open { display: flex; }
.mobile-menu .btn-primary { margin-top: var(--space-4); }

@media (max-width: 768px) {
  .nav, .header-actions { display: none; }
  .hamburger { display: block; }
}

/* ====================================================
   Footer
   ==================================================== */
.footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-primary);
  padding: var(--space-12) 0 var(--space-6);
  margin-top: auto;
}

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

.footer-brand p {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  margin-top: var(--space-4);
  max-width: 300px;
}

.footer-col h4 {
  font-size: var(--text-base);
  margin-bottom: var(--space-4);
  color: var(--text-primary);
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-col a {
  color: var(--text-secondary);
  font-size: var(--text-sm);
}
.footer-col a:hover {
  color: var(--color-primary);
}

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

@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: span 2; }
  .footer-bottom { flex-direction: column; gap: var(--space-3); text-align: center; }
}