/* ==========================================================================
   Header — HTCTheme
   ========================================================================== */

/* ── Site Header ─────────────────────────────────────────────────────────── */

.site-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  background: #ffffff;
  border-bottom: 1px solid var(--color-border);
  z-index: var(--z-sticky);
  transition: box-shadow 0.2s ease;
}

.site-header.is-scrolled {
  box-shadow: var(--shadow-sm);
}

/* ── Header Inner ─────────────────────────────────────────────────────────── */

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  gap: var(--space-8);
}

/* ── Logo ─────────────────────────────────────────────────────────────────── */

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.site-logo__mark {
  width: 36px;
  height: 36px;
  background: var(--color-primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: bold;
  font-size: 18px;
  flex-shrink: 0;
}

.site-logo__text {
  display: flex;
  flex-direction: column;
}

.site-logo__name {
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
  color: var(--color-text);
  line-height: 1.2;
}

.site-logo__sub {
  font-size: var(--text-xs);
  color: var(--color-text-light);
  line-height: 1;
}

/* ── Primary Navigation ───────────────────────────────────────────────────── */

.site-nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.site-nav__link {
  padding: 0.5rem var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text);
  border-radius: var(--radius-md);
  transition: color 0.15s ease, background-color 0.15s ease;
  white-space: nowrap;
  text-decoration: none;
}

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

.site-nav__link.is-active {
  color: var(--color-primary);
  background: var(--color-primary-bg);
}

/* ── Header CTA ───────────────────────────────────────────────────────────── */

.site-header__cta {
  margin-left: var(--space-4);
}

/* ── Hamburger Button ─────────────────────────────────────────────────────── */

.hamburger {
  display: none;
  width: 44px;
  height: 44px;
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 0;
}

.hamburger__line {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* ── Mobile Menu ──────────────────────────────────────────────────────────── */

.mobile-menu {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: #ffffff;
  z-index: calc(var(--z-sticky) - 1);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  transform: translateX(-100%);
  transition: transform 0.3s ease;
  overflow-y: auto;
}

.mobile-menu.is-open {
  transform: translateX(0);
}

.mobile-menu__nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.mobile-menu__link {
  display: block;
  padding: var(--space-4);
  font-size: var(--text-lg);
  font-weight: var(--weight-medium);
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border-light);
  text-decoration: none;
  transition: color 0.15s ease;
}

.mobile-menu__link:hover {
  color: var(--color-primary);
}

.mobile-menu__cta {
  margin-top: var(--space-6);
}

/* ── Responsive ───────────────────────────────────────────────────────────── */

@media (max-width: 768px) {
  .site-nav,
  .site-header__cta {
    display: none;
  }

  .hamburger {
    display: flex;
  }
}