/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  height: var(--header-height);
  background: var(--color-surface);
  border-bottom: 2px solid var(--color-border);
  box-shadow: var(--shadow-md);
  display: flex;
  align-items: center;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
  gap: var(--space-6);
}

/* ---- Logo ---- */
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  flex-shrink: 0;
  color: var(--color-heading);
  transition: opacity var(--transition-fast);
}
.site-logo:hover { opacity: 0.85; color: var(--color-heading); text-decoration: none; }

.logo-svg { width: 40px; height: 40px; flex-shrink: 0; }

.logo-text {
  font-weight: 800;
  font-size: var(--font-size-lg);
  line-height: 1.1;
  color: var(--color-heading);
}
.logo-text span {
  display: block;
  font-size: var(--font-size-xs);
  font-weight: 400;
  color: var(--color-text-muted);
  letter-spacing: 0.03em;
}

/* ---- Nav ---- */
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
  margin: 0; padding: 0;
}

.site-nav a {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  border: 1.5px solid transparent;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
}
.site-nav a:hover {
  background: var(--color-surface-alt);
  border-color: var(--color-border);
  color: var(--color-accent-dark);
  text-decoration: none;
}
.site-nav a[aria-current="page"],
.site-nav a.active {
  background: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}
.site-nav a[aria-current="page"]:hover,
.site-nav a.active:hover {
  background: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
  color: var(--color-white);
}
.nav-icon { font-size: 1.1em; line-height: 1; }

/* ---- Mobile toggle ---- */
.nav-toggle {
  display: none;
  background: none;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-3);
  cursor: pointer;
  color: var(--color-heading);
  font-size: var(--font-size-lg);
  line-height: 1;
  transition: background var(--transition-fast);
}
.nav-toggle:hover { background: var(--color-surface-alt); }

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

  .site-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0; right: 0;
    background: var(--color-surface);
    border-bottom: 2px solid var(--color-border);
    padding: var(--space-4) var(--gutter);
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
    box-shadow: var(--shadow-lg);
  }
  .site-nav.open { display: flex; }
  .site-nav a { justify-content: flex-start; }
  .logo-text span { display: none; }
}