/* ============================================
   LAYOUT – Header, Footer, Main
   ============================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: rgba(11, 15, 23, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

[data-theme="light"] .site-header {
  background-color: rgba(248, 250, 252, 0.9);
}

.site-header .nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-lg);
}

.logo-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  text-decoration: none;
  color: var(--color-text);
  flex-shrink: 0;
}

.logo-link:hover {
  color: var(--color-text);
}

.logo-badge {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  overflow: hidden;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-badge img,
.logo-badge svg {
  width: 100%;
  height: 100%;
  display: block;
}

.logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.logo-text strong {
  font-size: var(--font-size-lg);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.logo-text span {
  font-size: var(--font-size-xs);
  color: var(--color-text-subtle);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  color: var(--color-text);
  padding: 0.5rem;
  cursor: pointer;
  font-size: 1.25rem;
  line-height: 1;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  list-style: none;
}

.nav-menu a {
  display: block;
  padding: 0.5rem 0.875rem;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  border-radius: var(--radius-md);
  transition: color var(--transition), background-color var(--transition);
}

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

.nav-menu a.active {
  color: var(--color-text);
  background-color: var(--color-primary-muted);
}

.theme-toggle {
  background: none;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  width: 2.25rem;
  height: 2.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color var(--transition), color var(--transition);
  font-size: 1rem;
}

.theme-toggle:hover {
  background-color: var(--color-bg-surface);
  color: var(--color-text);
}

.site-main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-2xl) var(--spacing-lg);
  min-height: calc(100vh - var(--header-height) - 200px);
}

.site-footer {
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg-elevated);
  padding: var(--spacing-2xl) var(--spacing-lg) var(--spacing-lg);
  margin-top: var(--spacing-3xl);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

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

.footer-brand p {
  font-size: var(--font-size-sm);
  max-width: 280px;
}

.footer-section h4 {
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: var(--spacing-sm);
}

.footer-section a {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

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

.footer-bottom {
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
  text-align: center;
  font-size: var(--font-size-xs);
  color: var(--color-text-subtle);
}

.footer-bottom a {
  color: var(--color-text-muted);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--spacing-md);
    background-color: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    transform: translateY(-110%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.25s ease, opacity 0.25s ease;
  }

  .nav-menu.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-menu li {
    width: 100%;
  }

  .nav-menu a {
    padding: var(--spacing-md);
  }

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

  .site-main {
    padding: var(--spacing-xl) var(--spacing-md);
  }
}