/* ═══════════════════════════════════════════════════════════
   Header Component
   ═══════════════════════════════════════════════════════════ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: var(--color-overlay);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-sm);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--content-max-width);
  margin-inline: auto;
  padding-inline: var(--space-6);
  gap: var(--space-4);
}

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

.site-header__logo:hover {
  opacity: 0.85;
}

.site-header__logo svg {
  width: 2.25rem;
  height: 2.25rem;
  flex-shrink: 0;
}

.site-header__wordmark {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  line-height: var(--line-height-tight);
  letter-spacing: -0.01em;
}

.site-header__wordmark span {
  display: block;
  font-weight: var(--font-weight-normal);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  letter-spacing: 0;
}

/* ── Navigation ─────────────────────────────────────────── */
.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.site-nav__link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-muted);
  text-decoration: none;
  white-space: nowrap;
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast);
}

.site-nav__link svg {
  width: 1.1rem;
  height: 1.1rem;
  flex-shrink: 0;
}

.site-nav__link:hover {
  color: var(--color-primary-dark);
  background-color: var(--color-primary-bg);
}

.site-nav__link[aria-current="page"],
.site-nav__link.is-active {
  color: var(--color-primary-dark);
  background-color: var(--color-primary-bg);
  font-weight: var(--font-weight-semibold);
}

/* ── Mobile toggle ──────────────────────────────────────── */
.site-header__menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-2);
  cursor: pointer;
  color: var(--color-text);
  transition: background-color var(--transition-fast);
}

.site-header__menu-toggle:hover {
  background-color: var(--color-surface-alt);
}

.site-header__menu-toggle svg {
  width: 1.25rem;
  height: 1.25rem;
  display: block;
}

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 900px) {
  .site-header__wordmark span {
    display: none;
  }
}

@media (max-width: 768px) {
  .site-header__inner {
    padding-inline: var(--space-4);
  }

  .site-header__menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    padding: var(--space-2);
  }

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

  .site-nav__link {
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-base);
  }
}