/* Header, footer, shell */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  min-height: var(--header-height);
  padding: 0 var(--space-sm);
  background: rgba(13, 13, 13, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
}

.logo {
  font-family: var(--font-heading);
  font-size: var(--fs-lg);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.logo span {
  color: var(--color-accent);
}

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

.lang-switcher {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 4px;
}

.lang-switcher button {
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  font-weight: 600;
  padding: 6px 10px;
  border-radius: calc(var(--radius-sm) - 4px);
  transition: background 0.15s ease, color 0.15s ease;
}

.lang-switcher button:hover {
  color: var(--color-text);
}

.lang-switcher button.is-active {
  background: var(--color-accent);
  color: #000000;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md) var(--space-sm);
  border-top: 1px solid var(--color-border);
}

.powered-by {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
}

.powered-by a {
  color: var(--color-text-muted);
  border-bottom: 1px solid currentColor;
  transition: color 0.15s ease;
}

.powered-by a:hover {
  color: var(--color-accent);
}

.ad-slot {
  width: 100%;
  min-height: 90px;
  margin-top: var(--space-md);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
}

.ad-slot[hidden] {
  display: none;
}