/* ==========================================================================
   AI Header — layout, v1.5
   - Colors come from design tokens --aib-* (via the --ai-* chain below), so a
     user-chosen color/font always wins over the brand.
   - Brand identity = the --aih-* vars declared in assets/brands/<brand>.css.
   - Preset + behaviour defaults per brand: AIHeader.brandDefaults(brand).
   - All classes are prefixed "ai-".
   ========================================================================== */

/* ---------- 1. Variables & reset ---------- */
.ai-header {
  /* Colors: brand layer may set --aih-* (see ai-chrome/brands/<brand>.css),
     but every one of them FALLS BACK to the design tokens (--aib-*), so a
     user-chosen color (palette, injected after tokens.css) always wins:
     option color > brand color > base default. */
  --ai-primary: var(--aih-btn-bg, var(--aib-primary, #111111));
  --ai-bg: var(--aih-bg, var(--aib-surface, #ffffff));
  --ai-bg-alt: var(--aih-bg-alt, var(--aib-surface-alt, #f8f9fa));
  --ai-text: var(--aih-text, var(--aib-text, #111111));
  --ai-text-muted: var(--aih-text-muted, var(--aib-text-muted, #6b7280));
  --ai-border: var(--aih-border, var(--aib-border, #e5e7eb));
  --ai-btn-text: var(--aih-btn-color, var(--aib-on-primary, #ffffff));
  /* Nav link + logo text (brand may separate them from --ai-text) */
  --ai-link: var(--aih-link-color, var(--ai-text));
  --ai-logo: var(--aih-logo-color, var(--ai-text));
  /* Inline "action" nav item (contact link) shares the CTA color */
  --ai-action: var(--aih-btn-bg, var(--aib-primary, #111111));

  /* Palette "solid" dùng cho header transparent (khi cuộn, submenu, drawer) */
  --ai-solid-primary: var(--aih-solid-btn-bg, var(--aih-btn-bg, var(--aib-primary, #111111)));
  --ai-solid-bg: var(--aih-solid-bg, var(--aib-surface, #ffffff));
  --ai-solid-bg-alt: var(--aih-solid-bg-alt, var(--aib-surface-alt, #f8f9fa));
  --ai-solid-text: var(--aih-solid-text, var(--aib-text, #111111));
  --ai-solid-text-muted: var(--aih-solid-text-muted, var(--aib-text-muted, #6b7280));
  --ai-solid-border: var(--aih-solid-border, var(--aib-border, #e5e7eb));
  --ai-solid-btn-text: var(--aih-solid-btn-color, var(--aib-on-primary, #ffffff));

  /* Focus ring / drawer scrim / pinned shadow (brand-tunable, token-based default) */
  --ai-focus: var(--aih-focus-color, var(--ai-text));
  --ai-overlay: var(--aih-overlay, rgba(17, 17, 17, 0.45));
  --ai-pin-shadow: var(--aih-pin-shadow, 0 6px 24px rgba(0, 0, 0, 0.1));

  /* Font */
  --ai-font: var(
    --aib-font-body,
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif
  );

  /* Kích thước & chuyển động (brand ghi đè bằng --aih-*) */
  --ai-height: var(--aih-height, 68px);
  --ai-radius: var(--aih-radius, 8px);
  --ai-icon-radius: var(--aih-icon-radius, var(--ai-radius));
  --ai-transition: var(--aib-duration, 0.25s) var(--aib-easing, ease);

  position: relative;
  width: 100%;
  background-color: var(--ai-bg);
  color: var(--ai-text);
  border-bottom: 1px solid transparent; /* chỉ hiện khi pinned */
  z-index: 1030;
  font-family: var(--ai-font);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition:
    background-color 0.3s ease,
    border-color 0.3s ease,
    box-shadow 0.3s ease;
}

.ai-header *,
.ai-header *::before,
.ai-header *::after { box-sizing: border-box; }
.ai-header ul,
.ai-header ol { list-style: none; margin: 0; padding: 0; }
.ai-header a { text-decoration: none; }
.ai-header button { font-family: inherit; }

.ai-header a:focus-visible,
.ai-header button:focus-visible {
  outline: 2px solid var(--aih-focus-color, var(--ai-text));
  outline-offset: 2px;
}

/* Sticky mode */
.ai-header--sticky { position: sticky; top: 0; }

/* Hiệu ứng khi dính (JS bật .ai-header--pinned khi cuộn > 24px) */
.ai-header--pin-border.ai-header--pinned { border-bottom-color: var(--ai-border); }
.ai-header--pin-shadow.ai-header--pinned { box-shadow: var(--aih-pin-shadow, 0 6px 24px rgba(0, 0, 0, 0.1)); }

/* Sticky style */
.ai-header--sticky-jumpdown {
  transition:
    transform 0.32s ease,
    background-color 0.3s ease,
    border-color 0.3s ease,
    box-shadow 0.3s ease;
}
.ai-header--sticky-jumpdown.ai-header--hidden { transform: translateY(-100%); }

.ai-header__inner { transition: min-height 0.3s ease; }
.ai-header--sticky-shrink.ai-header--pinned { --ai-height: var(--aih-height-shrink, 54px); }
.ai-header--sticky-shrink.ai-header--pinned .ai-header__inner { padding-top: 4px; padding-bottom: 4px; }
.ai-header--sticky-shrink.ai-header--pinned .ai-header__logo-img { max-height: 30px; }
.ai-header--sticky-shrink.ai-header--pinned .ai-header__brand { font-size: 16px; }

body.ai-no-scroll { overflow: hidden; }

/* ---------- 2. Container & inner ---------- */
.ai-header__container {
  width: 100%;
  max-width: var(--aib-container, 1240px);
  margin: 0 auto;
  padding-left: 16px;
  padding-right: 16px;
}
.ai-header__inner {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: var(--ai-height);
  padding-top: 8px;
  padding-bottom: 8px;
  position: relative;
}
.ai-header__right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  margin-left: auto;
}

/* ---------- 3. Logo / brand ---------- */
.ai-header__brand {
  display: inline-flex;
  align-items: center;
  justify-content: flex-start;
  gap: 8px;
  height: 42px;
  font-family: var(--aih-logo-family, var(--aib-font-heading, inherit));
  font-size: var(--aih-logo-size, 18px);
  font-weight: var(--aih-logo-weight, 700);
  text-transform: var(--aih-logo-transform, none);
  letter-spacing: var(--aih-logo-spacing, 0);
  color: var(--aih-logo-color, var(--ai-text));
  white-space: nowrap;
  flex-shrink: 0;
  transition: color var(--ai-transition);
}
.ai-header__brand:hover { color: var(--aih-logo-hover-color, var(--ai-primary)); }
.ai-header__logo-img { max-height: 40px; width: auto; display: block; }
.ai-header__logo-fallback {
  display: none;
  align-items: center;
  line-height: 1;
}
.ai-header__brand.ai-logo-fallback .ai-header__logo-img { display: none; }
.ai-header__brand.ai-logo-fallback .ai-header__logo-fallback { display: inline-flex; }

/* ---------- 4. Desktop navigation ---------- */
.ai-header__nav { display: flex; align-items: center; }
.ai-header__menu { display: flex; align-items: center; gap: 4px; }
.ai-header__item { position: relative; }

.ai-header__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 42px;
  padding: 10px 14px;
  font: var(--aih-link-font, 500 var(--aib-size-nav, 15px)/1.5 var(--ai-font));
  text-transform: var(--aih-link-transform, none);
  letter-spacing: var(--aih-link-spacing, 0);
  color: var(--aih-link-color, var(--ai-text));
  background: transparent;
  border: none;
  border-radius: var(--ai-radius);
  cursor: pointer;
  flex-shrink: 0;
  transition:
    color var(--ai-transition),
    background-color var(--ai-transition);
}
.ai-header__link:hover,
.ai-header__item--has-children.is-open > .ai-header__link {
  color: var(--aih-link-hover-color, var(--ai-primary));
  background-color: transparent;
  text-decoration: var(--aih-link-hover-decoration, underline);
  text-underline-offset: 6px;
  text-decoration-thickness: 1.5px;
}

/* Mục đang active: aria-current, .is-active hoặc class của WordPress */
.ai-header__link[aria-current="page"],
.ai-header__item.is-active > .ai-header__link,
.ai-header__item.current-menu-item > .ai-header__link,
.ai-header__item.current-menu-ancestor > .ai-header__link {
  border-bottom: var(--aih-link-active-border, none);
  border-radius: 0;
}

.ai-nav-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  opacity: 0.85;
}
.ai-nav-icon-img {
  display: inline-block;
  width: 1em;
  height: 1em;
  object-fit: contain;
  flex-shrink: 0;
  vertical-align: -0.125em;
}
.ai-header__item--action > .ai-header__link {
  /* Inline "action" nav item. Defaults to the TOKEN link color (text-safe on
     the page) — NOT --aih-btn-bg, because a brand may make the CTA ghost
     (transparent) and the text would disappear; also red-on-white CTA colors
     fail AA as text. Brands may point it at their CTA color when readable. */
  color: var(--aih-action-color, var(--aib-link, var(--ai-primary)));
  font-weight: 600;
}

.ai-nav-chevron {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  opacity: 0.55;
  transition: transform var(--ai-transition);
}
.ai-header__item--has-children:hover > .ai-header__link .ai-nav-chevron,
.ai-header__item--has-children.is-open > .ai-header__link .ai-nav-chevron {
  transform: rotate(180deg);
}

.ai-btn-icon,
.ai-topbar-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.ai-topbar-icon { opacity: 0.75; }

/* ---------- 5. Dropdown submenu (desktop) ---------- */
.ai-header__submenu {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 220px;
  padding: 6px;
  background-color: var(--ai-bg);
  border: var(--aih-menu-border, 1px solid var(--ai-border));
  border-radius: var(--aih-menu-radius, var(--ai-radius));
  box-shadow: var(--aih-menu-shadow, 0 12px 32px rgba(17, 17, 17, 0.08));
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition:
    opacity 0.2s ease,
    transform 0.2s ease,
    visibility 0.2s;
  z-index: 20;
}
.ai-header__item--has-children:hover > .ai-header__submenu,
.ai-header__item--has-children:focus-within > .ai-header__submenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.ai-header__sublink {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  font-size: 14px;
  color: var(--ai-text);
  border-radius: calc(var(--aih-menu-radius, 6px) / 2);
  transition:
    background-color var(--ai-transition),
    color var(--ai-transition);
}
.ai-header__sublink:hover {
  background-color: var(--ai-bg-alt);
  color: var(--aih-link-hover-color, var(--ai-primary));
}

/* ---------- 6. Action buttons ---------- */
.ai-header__actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.ai-header__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: var(--aih-btn-height, 42px);
  padding: var(--aih-btn-padding, 10px 18px);
  font: var(--aih-btn-font, 600 var(--aib-size-button, 15px)/1 var(--ai-font));
  border-radius: var(--aih-btn-radius, var(--ai-radius));
  border: 1px solid transparent;
  white-space: nowrap;
  cursor: pointer;
  flex-shrink: 0;
  transition:
    background-color var(--ai-transition),
    color var(--ai-transition),
    border-color var(--ai-transition),
    filter var(--ai-transition),
    opacity var(--ai-transition),
    transform var(--ai-transition);
}
.ai-header__btn--primary {
  background-color: var(--aih-btn-bg, var(--ai-primary));
  color: var(--aih-btn-color, var(--ai-btn-text));
  border-color: var(--aih-btn-border, var(--aih-btn-bg, var(--ai-primary)));
}
.ai-header__btn--primary:hover {
  background-color: var(--aih-btn-hover-bg, var(--ai-primary));
  border-color: var(--aih-btn-hover-bg, var(--ai-primary));
  filter: var(--aih-btn-hover-filter, brightness(1.1));
  color: var(--aih-btn-color, var(--ai-btn-text));
}
.ai-header__btn--outline {
  background-color: transparent;
  color: var(--aih-btn-bg, var(--ai-primary));
  border-color: var(--aih-btn-bg, var(--ai-primary));
}
.ai-header__btn--outline:hover {
  background-color: var(--aih-btn-bg, var(--ai-primary));
  color: var(--aih-btn-color, var(--ai-btn-text));
}
.ai-header__btn--ghost {
  background-color: transparent;
  color: var(--ai-text);
  border-color: var(--ai-border);
}
.ai-header__btn--ghost:hover { background-color: var(--ai-bg-alt); }

/* Pressed (brand đặt --aih-pressed-*; mặc định không đổi) */
.ai-header__btn:active,
.ai-header__burger:active,
.ai-header__menu-toggle:active,
.ai-header__drawer-close:active {
  transform: scale(var(--aih-pressed-scale, 1));
  opacity: var(--aih-pressed-opacity, 1);
}

/* ---------- 7. Burger button ---------- */
.ai-header__burger {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--ai-text);
  border-radius: var(--ai-icon-radius);
  cursor: pointer;
  transition:
    background-color var(--ai-transition),
    transform var(--ai-transition),
    opacity var(--ai-transition);
}
.ai-header__burger:hover { background-color: var(--ai-bg-alt); }

/* ---------- 8. Topbar ---------- */
.ai-header__topbar {
  background-color: var(--ai-bg-alt);
  color: var(--ai-text-muted);
  font: var(--aih-topbar-font, 400 var(--aib-size-caption, 14px)/1.5 var(--ai-font));
  border-bottom: 1px solid var(--ai-border);
}
.ai-header__topbar-inner {
  display: flex;
  justify-content: flex-end;
  padding-top: 8px;
  padding-bottom: 8px;
}
.ai-header__topbar-list { display: flex; gap: 22px; }
.ai-header__topbar-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: inherit;
  transition: color var(--ai-transition);
}
.ai-header__topbar-link:hover { color: var(--ai-text); }

/* ---------- 9. Mobile drawer + overlay ---------- */
.ai-header__drawer {
  position: fixed;
  top: 0;
  bottom: 0;
  width: 100%;
  max-width: 100%;
  display: flex;
  flex-direction: column;
  background-color: var(--ai-bg);
  color: var(--ai-text);
  z-index: 1060;
  box-shadow: var(--aih-drawer-shadow, 0 0 60px rgba(0, 0, 0, 0.15));
  transition:
    transform 0.32s cubic-bezier(0.16, 1, 0.3, 1),
    max-height 0.32s cubic-bezier(0.16, 1, 0.3, 1);
  overflow: hidden;
}
.ai-drawer--left { left: 0; transform: translateX(-100%); }
.ai-drawer--right { right: 0; transform: translateX(100%); }
.ai-drawer--left.is-open,
.ai-drawer--right.is-open { transform: translateX(0); }

.ai-drawer--dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  bottom: auto;
  height: auto;
  max-height: 0;
  transform: none;
  box-shadow: none;
  border-top: 1px solid var(--ai-border);
}
.ai-drawer--dropdown.is-open {
  max-height: calc(100vh - var(--ai-height));
  overflow-y: auto;
}

.ai-drawer--bottom {
  left: 0;
  right: 0;
  bottom: 0;
  top: auto;
  max-height: 85vh;
  border-radius: 20px 20px 0 0;
  transform: translateY(100%);
  transition: transform 0.36s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: var(--aih-drawer-shadow, 0 -12px 40px rgba(0, 0, 0, 0.18));
}
.ai-drawer--bottom.is-open { transform: translateY(0); }
.ai-drawer--bottom .ai-header__drawer-close { top: 12px; right: 12px; }
.ai-drawer--bottom::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 4px;
  background: var(--ai-border);
  border-radius: 999px;
}
.ai-drawer--bottom .ai-header__drawer-body { padding-top: 40px; }

.ai-drawer--fullscreen {
  position: fixed;
  inset: 0;
  opacity: 0;
  visibility: hidden;
  transform: scale(0.96);
  transition:
    opacity 0.28s ease,
    transform 0.28s ease,
    visibility 0.28s;
}
.ai-drawer--fullscreen.is-open { opacity: 1; visibility: visible; transform: scale(1); }

/* Nút đóng: góc phải trên */
.ai-header__drawer-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  color: var(--ai-text);
  border-radius: 50%;
  cursor: pointer;
  z-index: 20;
  transition:
    background-color var(--ai-transition),
    transform var(--ai-transition),
    opacity var(--ai-transition);
}
.ai-header__drawer-close:hover { background-color: var(--ai-bg-alt); }

/* Thân drawer: chừa chỗ cho nút đóng */
.ai-header__drawer-body {
  flex: 1;
  overflow-y: auto;
  padding: 64px 24px 24px;
  display: flex;
  flex-direction: column;
}
.ai-header__drawer-actions {
  margin-top: auto;
  padding-top: 24px;
}
.ai-header__drawer-actions .ai-header__btn {
  width: 100%;
  height: auto;
  min-height: var(--aih-btn-height, 42px);
  justify-content: center;
  padding: 14px 20px;
  font-size: 15px;
}

/* Menu dọc trong drawer */
.ai-header__menu--vertical {
  flex-direction: column;
  align-items: stretch;
  gap: 0;
}
.ai-header__menu--vertical .ai-header__link {
  width: 100%;
  height: auto;
  padding: 18px 6px;
  border-radius: 0;
  font-size: 16px;
  letter-spacing: -0.01em;
}
.ai-header__menu--vertical .ai-header__link:hover,
.ai-header__menu--vertical .ai-header__item--has-children.is-open > .ai-header__link {
  background-color: transparent;
  color: var(--aih-link-hover-color, var(--ai-primary));
}
.ai-header__menu--vertical .ai-nav-chevron { margin-left: auto; }
.ai-header__menu--vertical .ai-header__submenu {
  position: static;
  opacity: 1;
  visibility: visible;
  transform: none;
  box-shadow: none;
  border: none;
  padding: 0 0 0 14px;
  min-width: 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
}
.ai-header__menu--vertical .ai-header__item--has-children.is-open > .ai-header__submenu { max-height: 600px; }
.ai-header__menu--vertical .ai-header__sublink { padding: 14px 8px; font-size: 15px; font-weight: 500; }

/* Overlay */
.ai-header__overlay {
  position: fixed;
  inset: 0;
  background-color: var(--aih-overlay, rgba(17, 17, 17, 0.45));
  z-index: 1050;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s;
}
.ai-header__overlay.is-open { opacity: 1; visibility: visible; }
.ai-header[data-ai-mobile="dropdown"] .ai-header__overlay,
.ai-header[data-ai-mobile="fullscreen"] .ai-header__overlay { display: none !important; }

/* ---------- 10. Preset layouts ---------- */
.ai-header__inner--p1,
.ai-header__inner--p3 {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 16px;
}
.ai-header__inner--p1 .ai-header__nav { justify-self: center; }
.ai-header__inner--p1 .ai-header__right { margin-left: auto; }
.ai-header__inner--p3 .ai-header__nav { justify-self: end; }
.ai-header__inner--p3 .ai-header__right { margin-left: 0; }

.ai-header__inner--p2 { display: flex; gap: 16px; }
.ai-header__inner--p2 .ai-header__right { margin-left: auto; }
.ai-header__brand--abs-center {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  max-width: calc(100% - 190px);
  overflow: hidden;
  text-overflow: ellipsis;
}
.ai-header__brand--abs-center .ai-header__logo-fallback { overflow: hidden; max-width: 100%; }
.ai-header__brand--abs-center .ai-header__logo-fallback span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.ai-header__inner--p4 {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
}
.ai-header__inner--p4 .ai-header__nav--split-left { justify-content: flex-end; }
.ai-header__inner--p4 .ai-header__right { justify-content: flex-start; margin-left: 0; }
.ai-header__inner--p4 .ai-header__nav--split-right { justify-content: flex-start; }
.ai-header__inner--p4 .ai-header__brand--split-center { white-space: nowrap; }

.ai-header__inner--p5 {
  display: flex;
  flex-direction: column;
  gap: 0;
  min-height: auto;
  padding-top: 12px;
  padding-bottom: 10px;
}
.ai-header__row { display: flex; align-items: center; width: 100%; }
.ai-header__row--top {
  position: relative;
  justify-content: center;
  min-height: 48px;
  padding-bottom: 6px;
}
.ai-header__row--top .ai-header__right {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  margin-left: 0;
}
.ai-header__brand--center { max-width: calc(100% - 120px); overflow: hidden; text-overflow: ellipsis; }
.ai-header__brand--center .ai-header__logo-fallback {
  overflow: hidden;
  max-width: 100%;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.ai-header__row--nav { padding-top: 6px; justify-content: center; }
.ai-header__nav--full { width: 100%; justify-content: center; }
.ai-header__nav--full .ai-header__menu { justify-content: center; flex-wrap: wrap; }

/* ---------- 11. P2: icon menu + popmenu ---------- */
.ai-header__menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--ai-text);
  border-radius: var(--ai-icon-radius);
  cursor: pointer;
  flex-shrink: 0;
  transition:
    background-color var(--ai-transition),
    transform var(--ai-transition),
    opacity var(--ai-transition);
}
.ai-header__menu-toggle:hover { background-color: var(--ai-bg-alt); }

.ai-header__popmenu {
  position: absolute;
  top: 100%;
  left: 0;
  width: 300px;
  max-width: calc(100vw - 32px);
  max-height: calc(100vh - var(--ai-height) - 16px);
  overflow-y: auto;
  background-color: var(--ai-bg);
  color: var(--ai-text);
  border: var(--aih-menu-border, 1px solid var(--ai-border));
  border-radius: var(--aih-menu-radius, 12px);
  box-shadow: var(--aih-menu-shadow, 0 18px 50px rgba(0, 0, 0, 0.14));
  padding: 8px;
  z-index: 40;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s;
}
.ai-header__popmenu.is-open { opacity: 1; visibility: visible; transform: none; }
.ai-header__popmenu-actions {
  padding: 8px 4px 4px;
  border-top: 1px solid var(--ai-border);
  margin-top: 4px;
}
.ai-header__popmenu-actions .ai-header__btn { width: 100%; }
.ai-header__popmenu .ai-header__item--has-children:hover > .ai-header__submenu { max-height: 600px; }

/* ---------- 12. Responsive (mobile < 768px) ---------- */
@media (max-width: 767.98px) {
  .ai-header__inner > .ai-header__nav,
  .ai-header__topbar { display: none; }

  .ai-header__burger { display: flex; }

  .ai-header__inner {
    min-height: var(--aih-height-mobile, 60px);
    gap: 12px;
    padding-top: 6px;
    padding-bottom: 6px;
  }
  .ai-header__btn { padding: 9px 14px; font-size: 13px; }

  .ai-header__inner--p1,
  .ai-header__inner--p3,
  .ai-header__inner--p4 { grid-template-columns: auto 1fr; }
  .ai-header__inner--p1 .ai-header__right,
  .ai-header__inner--p3 .ai-header__right { justify-content: flex-end; }
  .ai-header__inner--p2 .ai-header__right,
  .ai-header__inner--p3 .ai-header__right,
  .ai-header__inner--p4 .ai-header__right { margin-left: auto; }

  .ai-header__popmenu {
    left: 0;
    right: 0;
    width: 100%;
    max-width: 100%;
    border-radius: 0 0 12px 12px;
    border-left: none;
    border-right: none;
  }
  .ai-header--preset-2 .ai-header__burger { display: none !important; }

  .ai-header__logo-img { max-height: 32px; }
  .ai-header__brand { font-size: var(--aih-logo-size-mobile, 16px); }

  .ai-header__inner--p4 .ai-header__nav--split-left,
  .ai-header__inner--p4 .ai-header__nav--split-right { display: none; }

  .ai-header__inner--p5 .ai-header__row--nav { display: none; }
  .ai-header__inner--p5 .ai-header__row--top { border-bottom: none; padding-bottom: 0; min-height: auto; }
  .ai-header__inner--p5 { padding-top: 0; padding-bottom: 0; }
}

@media (min-width: 768px) {
  .ai-header__drawer,
  .ai-header__overlay { display: none !important; }
}

/* ---------- 13. Transparent header (phủ hero) ---------- */
.ai-header--transparent {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  background-color: transparent;
  border-bottom-color: transparent;
  /* Over-image palette: defaults to the "on dark" tokens (a full-bleed hero is
     dark most of the time); a brand can tune it via --aih-transparent-*. */
  --ai-text: var(--aih-transparent-text, var(--aib-on-dark, #ffffff));
  --ai-text-muted: var(--aih-transparent-text-muted, var(--aib-on-dark-soft, rgba(255, 255, 255, 0.75)));
  --ai-bg-alt: var(--aih-transparent-bg-alt, color-mix(in srgb, var(--ai-text) 14%, transparent));
  --ai-border: var(--aih-transparent-border, color-mix(in srgb, var(--ai-text) 30%, transparent));
  --ai-primary: var(--aih-transparent-btn-bg, var(--ai-solid-primary));
}
.ai-header--transparent .ai-header__topbar {
  background-color: transparent;
  color: var(--ai-text-muted);
  border-bottom-color: var(--ai-border);
}
.ai-header--transparent .ai-header__topbar-link:hover { color: var(--ai-text); }
.ai-header--transparent .ai-header__brand,
.ai-header--transparent .ai-header__brand:hover,
.ai-header--transparent .ai-header__link,
.ai-header--transparent .ai-header__link:hover,
.ai-header--transparent .ai-header__item--has-children.is-open > .ai-header__link,
.ai-header--transparent .ai-header__burger,
.ai-header--transparent .ai-header__menu-toggle { color: var(--ai-text); }
.ai-header--transparent .ai-header__link:hover,
.ai-header--transparent .ai-header__item--has-children.is-open > .ai-header__link {
  background-color: var(--ai-bg-alt);
}
.ai-header--transparent .ai-header__burger:hover,
.ai-header--transparent .ai-header__menu-toggle:hover { background-color: var(--ai-bg-alt); }

/* Submenu / drawer / popmenu nổi trên page → palette solid */
.ai-header--transparent .ai-header__submenu,
.ai-header--transparent .ai-header__drawer,
.ai-header--transparent .ai-header__popmenu {
  --ai-text: var(--ai-solid-text);
  --ai-text-muted: var(--ai-solid-text-muted);
  --ai-bg-alt: var(--ai-solid-bg-alt);
  --ai-border: var(--ai-solid-border);
  --ai-bg: var(--ai-solid-bg);
  background-color: var(--ai-bg);
  color: var(--ai-text);
}

/* Đã cuộn: nền solid, fixed trên top */
.ai-header--transparent.ai-header--solid {
  position: fixed;
  --ai-bg: var(--ai-solid-bg);
  --ai-text: var(--ai-solid-text);
  --ai-text-muted: var(--ai-solid-text-muted);
  --ai-bg-alt: var(--ai-solid-bg-alt);
  --ai-border: var(--ai-solid-border);
  --ai-primary: var(--ai-solid-primary);
  --ai-btn-text: var(--ai-solid-btn-text);
  background-color: var(--ai-bg);
  border-bottom-color: var(--ai-border);
  box-shadow: var(--aih-pinned-shadow, 0 2px 16px rgba(0, 0, 0, 0.08));
}
.ai-header--transparent.ai-header--solid .ai-header__brand,
.ai-header--transparent.ai-header--solid .ai-header__brand:hover,
.ai-header--transparent.ai-header--solid .ai-header__link,
.ai-header--transparent.ai-header--solid .ai-header__link:hover,
.ai-header--transparent.ai-header--solid .ai-header__item--has-children.is-open > .ai-header__link,
.ai-header--transparent.ai-header--solid .ai-header__burger,
.ai-header--transparent.ai-header--solid .ai-header__menu-toggle { color: var(--ai-text); }

/* ---------- 14. Sticky float ---------- */
.ai-header--sticky-float.ai-header--sticky { top: 5px; }
.ai-header--sticky-float.ai-header--pinned,
.ai-header--sticky-float.ai-header--solid {
  background-color: transparent;
  border-bottom-color: transparent;
  box-shadow: none;
}
.ai-header--sticky-float .ai-header__container {
  transition:
    border-radius 0.35s ease,
    margin-top 0.35s ease,
    box-shadow 0.35s ease,
    background-color 0.3s ease,
    border-color 0.3s ease;
}
.ai-header--sticky-float.ai-header--pinned .ai-header__container,
.ai-header--sticky-float.ai-header--solid .ai-header__container {
  background-color: var(--ai-bg);
  border: none;
  border-radius: var(--aih-float-radius, 18px);
  box-shadow: var(--aih-float-shadow, 0 12px 32px rgba(0, 0, 0, 0.12));
  margin-top: 8px;
  padding-left: 20px;
  padding-right: 20px;
}
.ai-header--sticky-float.ai-header--pinned { --ai-height: 56px; }
.ai-header--sticky-float.ai-header--pinned .ai-header__topbar,
.ai-header--sticky-float.ai-header--solid .ai-header__topbar { display: none; }
@media (max-width: 767.98px) {
  .ai-header--sticky-float.ai-header--pinned .ai-header__container,
  .ai-header--sticky-float.ai-header--solid .ai-header__container {
    border-radius: 14px;
    margin-top: 8px;
    padding-left: 12px;
    padding-right: 12px;
  }
}

/* ---------- 15. Nền khi dính: glass ---------- */
/* Blur đặt trên ::before, KHÔNG đặt trên <header>: backdrop-filter trên header
   sẽ biến nó thành containing block của drawer/overlay (position: fixed) làm
   drawer bị lệch. ::before nằm dưới nội dung (z-index -1 trong stacking context
   của header). */
.ai-header--stickybg-glass.ai-header--pinned:not(.ai-header--sticky-float),
.ai-header--stickybg-glass.ai-header--solid:not(.ai-header--sticky-float) {
  background-color: transparent;
}
.ai-header--stickybg-glass.ai-header--pinned:not(.ai-header--sticky-float)::before,
.ai-header--stickybg-glass.ai-header--solid:not(.ai-header--sticky-float)::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-color: color-mix(in srgb, var(--ai-bg) 72%, transparent);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  backdrop-filter: saturate(180%) blur(18px);
}
/* Float: glass chỉ nằm trong container (drawer là anh em của container nên không bị ảnh hưởng) */
.ai-header--sticky-float.ai-header--stickybg-glass.ai-header--pinned .ai-header__container,
.ai-header--sticky-float.ai-header--stickybg-glass.ai-header--solid .ai-header__container {
  background-color: color-mix(in srgb, var(--ai-bg) 72%, transparent);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  backdrop-filter: saturate(180%) blur(18px);
}

/* ---------- 16. Tùy chọn chữ menu / căn menu ---------- */
.ai-header--menutext-upper .ai-header__link { text-transform: uppercase; letter-spacing: 0.06em; }
.ai-header--menutext-bold .ai-header__link { font-weight: 700; }
.ai-header--menualign-left .ai-header__nav { justify-self: start; }
.ai-header--menualign-center .ai-header__nav { justify-self: center; margin-inline: auto; }
.ai-header--menualign-right .ai-header__nav { justify-self: end; }