/* Layout: header, main, sections, containers */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-logo {
  font-weight: 600;
  color: var(--color-text);
}

.header-logo:hover {
  text-decoration: none;
  color: var(--color-primary);
}

.header-nav .nav-list {
  display: flex;
  gap: var(--space-lg);
  margin: 0;
  padding: 0;
  list-style: none;
}

.header-nav a {
  color: var(--color-text);
}

.header-nav a:hover {
  color: var(--color-primary);
}

#main-content {
  padding-top: var(--header-height);
}

.section {
  max-width: 960px;
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
  scroll-margin-top: var(--header-height);
}

.section-title {
  margin-bottom: var(--space-xl);
  font-size: 1.5rem;
}

.site-footer {
  padding: var(--space-lg) var(--space-lg);
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
  border-top: 1px solid var(--color-border);
}

.footer-copy {
  margin: 0;
}

/* Mobile header fixes */
@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding-top: var(--space-sm);
    padding-bottom: var(--space-sm);
  }

  .header-logo {
    width: 100%;
    text-align: center;
    margin-bottom: var(--space-xs);
    white-space: nowrap;
  }

  .header-nav {
    width: 100%;
    display: flex;
    justify-content: center;
  }

  .header-nav .nav-list {
    flex-wrap: nowrap;              /* 👈 force single line */
    justify-content: center;
    align-items: center;            /* 👈 vertical centering */
    gap: var(--space-xs);           /* 👈 tighter spacing */
  }
}