/* Containers & Sections - Desktop First Breathing Room */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section {
  padding: 5rem 0; /* Khoảng cách thở cực kỳ sang trọng trên Desktop */
}

.section-muted {
  background-color: var(--color-bg-muted);
}

.section-dark {
  background-color: var(--color-bg-dark);
  color: var(--color-text-light);
}

.section-dark h1, .section-dark h2, .section-dark h3, .section-dark h4 {
  color: var(--color-text-light);
}

.site-title {
  margin: 0;
}

.site-title a {
  line-height: 1.1;
}

.site-legacy-logo img,
.custom-logo {
  display: block;
  max-height: 56px;
  width: auto;
}

/* Header & Main Navigation Standards */
.site-header {
  background-color: var(--color-bg-light);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: var(--shadow-sm);
}

.main-navigation {
  min-width: 0;
}

.nav-list {
  list-style: none;
  margin: 0; padding: 0;
}

.nav-list a {
  display: inline-flex;
  align-items: center;
  color: var(--color-text-heading);
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.nav-list a:hover {
  color: var(--color-primary);
  background-color: var(--color-bg-muted);
}

.nav-list .current-menu-item > a,
.nav-list .current-menu-ancestor > a,
.nav-list .current_page_parent > a {
  color: var(--color-primary);
  background-color: var(--color-bg-muted);
}

.nav-list li {
  position: relative;
}

.nav-list .sub-menu {
  list-style: none;
  margin: 0;
  padding: 0.5rem;
}

.menu-item-overflow > .menu-link-wrap > a,
.menu-item-group-overflow > .menu-link-wrap > a {
  font-weight: 700;
}

.sub-menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  margin-left: 0.25rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text-heading);
  cursor: pointer;
}

.sub-menu-toggle:hover {
  background-color: var(--color-bg-muted);
  border-color: var(--color-border);
}

.sub-menu-toggle svg {
  transition: transform var(--transition-fast);
}

.menu-item-open > .menu-link-wrap > .sub-menu-toggle svg {
  transform: rotate(180deg);
}

/* Desktop Navigation */
@media (min-width: 1025px) {
  .menu-toggle { display: none !important; } /* Ẩn hoàn toàn nút hamburger trên PC */
  .site-header .container {
    gap: var(--spacing-lg);
  }
  .site-branding {
    flex: 0 0 auto;
    max-width: 220px;
  }
  .main-navigation {
    flex: 1 1 auto;
    justify-content: flex-end;
  }
  .nav-list {
    display: flex !important;
    align-items: center;
    gap: 0.125rem;
    flex-wrap: nowrap;
    overflow: visible;
    white-space: nowrap;
    max-width: 100%;
  }
  .nav-list > li {
    flex: 0 0 auto;
  }
  .nav-list a {
    white-space: nowrap;
    padding: 0.5rem 0.75rem;
    font-size: 0.95rem;
    line-height: 1.25;
  }
  .header-cta {
    flex: 0 0 auto;
    margin-left: var(--spacing-sm);
  }
  .sub-menu-toggle { display: none; }
  .nav-list .sub-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 0;
    min-width: 240px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    pointer-events: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-bg-light);
    box-shadow: var(--shadow-xl);
    z-index: 120;
    transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  }
  .nav-list .sub-menu a {
    width: 100%;
  }
  .menu-item-overflow > .sub-menu,
  .menu-item-group-overflow > .sub-menu {
    right: 0;
    left: auto;
  }
  .nav-list li:hover > .sub-menu,
  .nav-list li:focus-within > .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
  }
}

/* Mobile & Tablet Navigation */
@media (max-width: 1024px) {
  .menu-toggle { display: inline-flex; } /* Hiển thị nút hamburger */
  .nav-list { display: none; } /* Ẩn menu ngang mặc định */
  .nav-list.toggled { 
    display: flex; 
    flex-direction: column; 
    position: absolute; 
    top: 100%; 
    left: 0; right: 0; 
    background: var(--color-bg-light); 
    padding: var(--spacing-lg); 
    box-shadow: var(--shadow-lg); 
    border-bottom: 1px solid var(--color-border);
    z-index: 100; 
  }
  .nav-list.toggled > li > .menu-link-wrap > a,
  .nav-list.toggled > li > a {
    display: block;
    width: 100%;
    padding: 0.75rem 1rem;
  }
  .menu-link-wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  .nav-list .sub-menu {
    display: none;
    margin-top: 0.35rem;
    margin-left: 0.5rem;
    border-left: 2px solid var(--color-border);
    padding-left: 0.5rem;
  }
  .nav-list .menu-item-open > .sub-menu {
    display: block;
  }
  .nav-list .sub-menu a {
    display: block;
    width: 100%;
    padding: 0.625rem 0.75rem;
    font-size: 0.95rem;
  }
}

/* Grids */
.grid {
  display: grid;
  gap: var(--spacing-xl);
}

.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* Responsive Grid & Spacing */
@media (max-width: 1024px) {
  .grid-cols-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-cols-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .section { padding: 4rem 0; }
}

@media (max-width: 768px) {
  .grid-cols-4, .grid-cols-3, .grid-cols-2 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
  .section { padding: 3rem 0; }
  .grid { gap: var(--spacing-lg); }
}

/* Flexbox utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }