/* ==========================================================================
   LAYOUT: HEADER, MAIN GRID, SIDEBAR, FOOTER
   ========================================================================== */

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: rgba(250, 249, 246, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background-color var(--transition-smooth), border-color var(--transition-smooth);
}

[data-theme="dark"] .site-header {
  background-color: rgba(14, 21, 18, 0.85);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-heading);
  font-weight: var(--font-weight-bold);
  font-size: var(--text-xl);
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.brand-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background-color: var(--accent-primary);
  color: #ffffff;
}

.brand-tagline {
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: var(--accent-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  display: block;
}

/* Navigation Links */
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  padding: 0.5rem 0.85rem;
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--text-primary);
  background-color: var(--bg-surface);
}

.nav-link.active {
  color: var(--accent-primary);
  font-weight: var(--font-weight-semibold);
  background-color: var(--badge-bg);
}

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

/* Mobile Nav Toggle */
.mobile-nav-toggle {
  display: none;
}

/* Hero Section */
.hero-section {
  position: relative;
  padding: var(--space-12) 0 var(--space-10);
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-subtle);
  overflow: hidden;
}

.hero-topo-bg {
  position: absolute;
  inset: 0;
  background-image: url('../assets/patterns/topo.svg');
  background-size: 600px;
  opacity: var(--hero-pattern-opacity);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 780px;
}

.hero-meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.hero-title {
  font-size: var(--text-5xl);
  margin-bottom: var(--space-4);
  line-height: 1.1;
}

.hero-lead {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  margin-bottom: var(--space-6);
}

/* Main Content Layout with Sidebar */
.main-wrapper {
  padding: var(--space-10) 0 var(--space-16);
}

.layout-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: var(--space-10);
  align-items: start;
}

.content-primary {
  min-width: 0;
}

.layout-single {
  display: block;
}

/* Sidebar */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
  position: sticky;
  top: calc(var(--header-height) + var(--space-6));
}

.sidebar-widget {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--elevation-shadow-sm);
}

.widget-title {
  font-size: var(--text-base);
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Footer */
.site-footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-12) 0 var(--space-8);
  color: var(--text-secondary);
}

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

.footer-col-title {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

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

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

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

/* Responsive Breakpoints */
@media (max-width: 992px) {
  .layout-grid {
    grid-template-columns: minmax(0, 1fr);
  }
  .sidebar {
    position: static;
    min-width: 0;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }

  .site-header {
    height: var(--header-height);
  }

  .brand {
    gap: 6px;
    font-size: 1rem;
    min-width: 0;
  }

  .brand span {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .brand-icon {
    width: 28px;
    height: 28px;
    min-width: 28px;
    border-radius: var(--radius-sm);
  }

  .brand-tagline {
    display: none;
  }

  .header-actions {
    gap: 6px;
    flex-shrink: 0;
  }

  .lang-switch {
    padding: 2px 7px;
    font-size: 0.7rem;
    gap: 3px;
  }

  .btn--icon {
    width: 36px;
    height: 36px;
    min-width: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
  }

  .mobile-nav-toggle {
    display: inline-flex;
  }

  .hero-section {
    padding: var(--space-6) 0;
  }

  .hero-title {
    font-size: clamp(1.5rem, 5.5vw, 2rem);
    margin-bottom: var(--space-3);
  }

  .hero-lead {
    font-size: var(--text-sm);
    line-height: 1.5;
    margin-bottom: var(--space-4);
  }

  .main-wrapper {
    padding: var(--space-6) 0 var(--space-10);
  }

  .layout-grid {
    gap: var(--space-6);
  }

  .site-nav {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--bg-primary);
    flex-direction: column;
    padding: var(--space-6) var(--space-4);
    z-index: 99;
    border-top: 1px solid var(--border-subtle);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }

  .site-nav.is-open {
    display: flex;
  }

  .nav-links {
    flex-direction: column;
    width: 100%;
    gap: var(--space-2);
  }

  .nav-link {
    width: 100%;
    min-height: 44px;
    display: flex;
    align-items: center;
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-base);
    border-radius: var(--radius-md);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .footer-bottom {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }
}

@media (max-width: 480px) {
  .brand {
    font-size: 0.9rem;
  }

  .header-actions {
    gap: 4px;
  }

  .btn--icon {
    width: 34px;
    height: 34px;
    min-width: 34px;
  }

  .hero-content .btn {
    width: 100%;
    justify-content: center;
  }

  .hero-meta {
    flex-wrap: wrap;
    gap: var(--space-2);
  }
}