/* ==========================================================================
   header.css - Header 3 hang + nav 3 cap + search + social + hamburger
   Hang 1: nen navy - logo 2 mau + icon search + 4 icon social
   Hang 2: nen navy - tagline
   Hang 3: nen blue - thanh nav (dropdown 3 cap, mo bang :hover VA :focus-within)
   ========================================================================== */

.ec-header {
  background-color: var(--ec-navy);
  color: var(--ec-on-navy);
}

/* ---------- Hang 1: logo + tien ich ---------- */
.ec-header__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--ec-space-4);
  padding-block: var(--ec-space-4);
}

/* ---------- Logo 2 mau, 2 co chu ----------
   "Edu-" trang, "Circular" green; chu dau moi phan to hon */
.ec-brand {
  display: inline-flex;
  align-items: baseline;
  font-family: var(--ec-font-logo);
  font-size: var(--ec-fs-logo);
  font-weight: 700;
  line-height: var(--ec-lh-tight);
  text-decoration: none;
  color: var(--ec-on-navy);
}

.ec-brand:hover,
.ec-brand:focus {
  text-decoration: none;
  color: var(--ec-on-navy);
}

.ec-brand__edu { color: var(--ec-on-navy); }

.ec-brand__circular { color: var(--ec-green); } /* green tren navy = 8.9:1 */

.ec-brand__cap {
  font-size: var(--ec-fs-logo-cap);
}

/* ---------- Logo dang anh (Customizer > Site Identity) ----------
   Chieu cao chot theo thang chu logo de doi anh khong lam dai header nhay chieu cao.
   width:auto giu ti le, max-width chan anh qua rong lam vo hang 1. */
.ec-brand--image {
  padding-block: var(--ec-space-2);
}

.ec-brand__image {
  display: block;
  width: auto;
  height: var(--ec-logo-height, 60px);
  max-width: min(260px, 60vw);
  object-fit: contain;
}

@media (max-width: 767px) {
  .ec-brand__image {
    height: var(--ec-logo-height-sm, 44px);
  }
}

/* ---------- Nhom tien ich ben phai hang 1 ---------- */
.ec-header__tools {
  display: flex;
  align-items: center;
  gap: var(--ec-space-4);
}

/* ---------- Search ---------- */
.ec-search {
  position: relative;
  display: flex;
  align-items: center;
}

/* Nut mo/dong o tim kiem */
.ec-search__toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--ec-on-navy);
  border-radius: var(--ec-radius);
  transition: background-color var(--ec-dur-fast) var(--ec-ease);
}

.ec-search__toggle:hover {
  background-color: var(--ec-shade-hover);
}

.ec-search__toggle svg {
  width: var(--ec-icon);
  height: var(--ec-icon);
  fill: currentColor;
}

/* O tim kiem: an mac dinh tren desktop, hien khi mo */
.ec-search__form {
  position: absolute;
  right: 0;
  top: calc(100% + var(--ec-space-2));
  z-index: 30;
  display: flex;
  align-items: center;
  gap: var(--ec-space-2);
  padding: var(--ec-space-2);
  background-color: var(--ec-navy);
  border: var(--ec-rule-width) solid var(--ec-border-on-navy);
}

/* Trang thai dong: dung [hidden] cua HTML va class .is-open cho JS ve sau */
.ec-search__form[hidden] { display: none; }

.ec-search.is-open .ec-search__form {
  display: flex;
}

/* Du phong khong JS: focus vao vung search thi mo o nhap */
.ec-search:focus-within .ec-search__form {
  display: flex;
}

.ec-search__field {
  min-width: 12rem;
  padding: var(--ec-space-2) var(--ec-space-3);
  border: var(--ec-rule-width) solid var(--ec-border-on-navy);
  background-color: var(--ec-white);
  color: var(--ec-text);
  font-family: var(--ec-font-body);
  font-size: var(--ec-fs-sm);
}

.ec-search__submit {
  padding: var(--ec-space-2) var(--ec-space-3);
  border: 0;
  background-color: var(--ec-blue);
  color: var(--ec-on-blue);
  font-family: var(--ec-font-ui);
  font-size: var(--ec-fs-sm);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.ec-search__submit:hover {
  background-color: var(--ec-white);
  color: var(--ec-navy);
}

/* ---------- Social: 4 icon SVG inline 20x20 (khong dung icon font) ---------- */
.ec-social {
  display: flex;
  align-items: center;
  gap: var(--ec-space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.ec-social__item { display: inline-flex; }

.ec-social__link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  color: var(--ec-on-navy);
  border-radius: var(--ec-radius);
  transition: background-color var(--ec-dur-fast) var(--ec-ease),
              color var(--ec-dur-fast) var(--ec-ease);
}

.ec-social__link:hover {
  background-color: var(--ec-shade-hover);
  color: var(--ec-green);
  text-decoration: none;
}

.ec-social__link svg,
.ec-social__icon {
  width: var(--ec-icon);
  height: var(--ec-icon);
  fill: currentColor;
  pointer-events: none;
}

/* ---------- Hang 2: tagline ---------- */
.ec-header__tagline {
  padding-bottom: var(--ec-space-4);
  font-family: var(--ec-font-ui);
  font-size: var(--ec-fs-tagline);
  font-weight: 400;
  line-height: var(--ec-lh-snug);
  color: var(--ec-on-navy);
}

/* F1 - co chu tagline chinh qua option ec_tagline_size (sm/md/lg) */
.ec-header__tagline--sm { font-size: calc(var(--ec-fs-tagline) * 0.85); }
.ec-header__tagline--md { font-size: var(--ec-fs-tagline); }
.ec-header__tagline--lg { font-size: calc(var(--ec-fs-tagline) * 1.25); }

/* ---------- Dai tagline dung widget (vung ec-header-tagline) ----------
   Widget Text in <div class="ec-header__tagline ...">, con ban hardcode in <p>.
   Cac rule tren dung class nen ap dung cho ca hai; phan duoi chi lo padding cua
   wrapper va thu nho khoang cach giua nhieu widget trong cung dai. */
.ec-header__tagline-area {
  padding-bottom: var(--ec-space-4);
  color: var(--ec-on-navy);
}

/* Wrapper da co padding-bottom nen bo cua tung widget de khong doi doi */
.ec-header__tagline-area .ec-header__tagline {
  padding-bottom: 0;
}

.ec-header__tagline-area .ec-text-widget__body + .ec-text-widget__body {
  margin-top: var(--ec-space-2);
}

.ec-header__tagline-area a {
  color: var(--ec-on-navy);
  text-decoration: underline;
}

.ec-header__tagline-area a:hover {
  color: var(--ec-green);
}

/* ---------- Hang 3: thanh nav ---------- */
.ec-navbar {
  background-color: var(--ec-blue);
}

.ec-navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--ec-space-4);
}

/* ---------- Bo chuyen ngon ngu: luon nam ngoai menu, ben phai thanh nav ---------- */
.ec-lang {
  display: flex;
  align-items: center;
  gap: var(--ec-space-3);
  margin-left: auto;
  font-family: var(--ec-font-ui);
  font-size: var(--ec-fs-nav);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.ec-lang ul {
  display: flex;
  align-items: center;
  gap: var(--ec-space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.ec-lang a {
  color: var(--ec-on-blue);
  text-decoration: none;
}

.ec-lang a:hover {
  color: var(--ec-green);
}

/* Ngon ngu hien tai: gach du de nhan biet */
.ec-lang .current-lang a {
  color: var(--ec-white);
  font-weight: 700;
}

/* Item ngon ngu trong menu khong dung nua — an di, switcher da ra ngoai */
.ec-nav .lang-item {
  display: none;
}

/* Desktop: menu ben trai nhu thiet ke goc, switcher ngon ngu day sat phai */
.ec-nav {
  order: -1;
}

/* ---------- Hamburger: CSS-only bang checkbox an ---------- */
.ec-nav-toggle {
  display: none; /* chi hien tren mobile */
  align-items: center;
  gap: var(--ec-space-2);
  padding: var(--ec-space-3) 0;
  color: var(--ec-on-blue);
  font-family: var(--ec-font-ui);
  font-size: var(--ec-fs-nav);
  text-transform: uppercase;
  cursor: pointer;
}

.ec-nav-toggle__bars {
  position: relative;
  display: block;
  width: 22px;
  height: 2px;
  background-color: currentColor;
}

.ec-nav-toggle__bars::before,
.ec-nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 22px;
  height: 2px;
  background-color: currentColor;
}

.ec-nav-toggle__bars::before { top: -6px; }
.ec-nav-toggle__bars::after { top: 6px; }

/* Checkbox dieu khien - an nhung van nhan duoc focus ban phim */
/*
 * Tren desktop hamburger khong hien (display:none), nen checkbox phai an HOAN TOAN.
 * Neu chi dung opacity:0 thi checkbox van nam trong tab order, nguoi dung ban phim
 * gap mot tab stop vo hinh khong lam gi ca. Chi bat lai o mobile (max-width:767px).
 */
.ec-nav-check {
  display: none;
}

.ec-nav-check:focus-visible + .ec-nav-toggle {
  outline: var(--ec-focus-width) solid var(--ec-focus-dark);
  outline-offset: var(--ec-focus-offset);
}

/* ---------- Menu cap 1 ---------- */
.ec-nav {
  flex: 1 1 auto;
}

.ec-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;   /* F3 - menu canh giua thanh nav */
  gap: var(--ec-space-2) var(--ec-space-6);   /* F3 - khoang cach deu giua cac muc */
  margin: 0;
  padding: 0;
  list-style: none;
}

.ec-nav__item {
  position: relative;
}

.ec-nav__link {
  display: block;
  padding: var(--ec-space-3) var(--ec-space-4);
  color: var(--ec-on-blue);
  font-family: var(--ec-font-ui);
  font-size: var(--ec-fs-nav);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  white-space: nowrap;
  transition: background-color var(--ec-dur-fast) var(--ec-ease),
              color var(--ec-dur-fast) var(--ec-ease);
}

.ec-nav__link:hover {
  background-color: var(--ec-navy);
  color: var(--ec-on-navy);
  text-decoration: none;
}

/*
 * Polylang language switcher dat co (<img>) hoac ten ngon ngu vao link menu.
 * <a> dang block nen anh baseline lam muc do lech chieu cao va tut xuong so voi cac
 * link chu. Cho link co anh thanh flex de anh (va chu ben canh, neu bat "show names")
 * can giua theo chieu doc, cao bang cac muc khac. .menu-item-language la class
 * Polylang tu them; du phong them li chi chua <img>. */
.ec-nav__item.menu-item-language > .ec-nav__link,
.ec-nav__link:has(> img) {
  display: inline-flex;
  align-items: center;
  gap: var(--ec-space-2);
}

/*
 * Link co (chi chua <img>) thap hon link chu: inline-flex bo line-box nen box chi cao
 * bang anh + padding. Ep noi dung ben trong cao bang line-height cua nav de moi muc
 * cung chieu cao, co khong tut xuong lech hang.
 */
.ec-nav__item.menu-item-language > .ec-nav__link::before,
.ec-nav__link:has(> img)::before {
  content: "";
  display: inline-block;
  width: 0;
  height: calc(var(--ec-fs-nav) * var(--ec-lh-base));
}

.ec-nav__link img {
  display: block;
  width: auto;
  height: 1em;
}

/* Item dang xem: dao mau (nen trang, chu navy) */
.ec-nav__item.is-active > .ec-nav__link,
.ec-nav__item.current-menu-item > .ec-nav__link,
.ec-nav__item.current-menu-ancestor > .ec-nav__link,
.ec-nav__item.current-menu-parent > .ec-nav__link {
  background-color: var(--ec-white);
  color: var(--ec-navy);
}

/* ---------- Dropdown cap 2 va cap 3 ---------- */
.ec-nav__sub {
  position: absolute;
  left: 0;
  top: 100%;
  z-index: 40;
  min-width: 15rem;
  margin: 0;
  padding: 0;
  list-style: none;
  background-color: var(--ec-navy);
  border: var(--ec-rule-width) solid var(--ec-border-on-navy);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity var(--ec-dur) var(--ec-ease),
              transform var(--ec-dur) var(--ec-ease),
              visibility var(--ec-dur) var(--ec-ease);
}

/* Mo bang chuot VA bang ban phim (SPEC muc 8) */
.ec-nav__item:hover > .ec-nav__sub,
.ec-nav__item:focus-within > .ec-nav__sub,
.ec-nav__subitem:hover > .ec-nav__sub,
.ec-nav__subitem:focus-within > .ec-nav__sub {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.ec-nav__subitem {
  position: relative;
  border-bottom: var(--ec-rule-width) solid var(--ec-border-on-navy);
}

.ec-nav__subitem:last-child { border-bottom: 0; }

.ec-nav__sublink {
  display: block;
  padding: var(--ec-space-2) var(--ec-space-4);
  color: var(--ec-on-navy);
  font-family: var(--ec-font-ui);
  font-size: var(--ec-fs-nav);
  line-height: var(--ec-lh-snug);
  transition: background-color var(--ec-dur-fast) var(--ec-ease),
              color var(--ec-dur-fast) var(--ec-ease);
}

.ec-nav__sublink:hover {
  background-color: var(--ec-shade-hover);
  color: var(--ec-green);
  text-decoration: none;
}

/* Item dang xem trong dropdown: dao mau */
.ec-nav__subitem.is-active > .ec-nav__sublink,
.ec-nav__subitem.current-menu-item > .ec-nav__sublink,
.ec-nav__subitem.current-menu-ancestor > .ec-nav__sublink {
  background-color: var(--ec-white);
  color: var(--ec-navy);
}

/* Cap 3: mo sang phai, thut le 12px, co dau ">" o dau */
.ec-nav__sub .ec-nav__sub {
  left: 100%;
  top: -1px;
}

.ec-nav__sub--l3 .ec-nav__sublink {
  padding-left: calc(var(--ec-space-4) + 12px);
}

.ec-nav__sub--l3 .ec-nav__sublink::before {
  content: "> ";
  color: var(--ec-green);
}

.ec-nav__sub--l3 .ec-nav__subitem.is-active > .ec-nav__sublink::before,
.ec-nav__sub--l3 .ec-nav__subitem.current-menu-item > .ec-nav__sublink::before {
  color: var(--ec-navy);
}

/* Mui chi cho item co con */
.ec-nav__item--has-children > .ec-nav__link::after {
  content: "";
  display: inline-block;
  width: 0;
  height: 0;
  margin-left: var(--ec-space-2);
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 4px solid currentColor;
  vertical-align: middle;
}

.ec-nav__subitem--has-children > .ec-nav__sublink::after {
  content: "\203A";
  float: right;
  margin-left: var(--ec-space-2);
}

/* Nut caret chi dung tren mobile (xem trong media query duoi); desktop an */
.ec-nav__caret {
  display: none;
}

/* ==========================================================================
   Mobile < 768px: hamburger + menu doc, dropdown bung thay vi noi
   ========================================================================== */
@media (max-width: 767px) {
  .ec-header__top {
    flex-wrap: wrap;
  }

  .ec-brand { font-size: var(--ec-fs-md); }
  .ec-brand__cap { font-size: var(--ec-fs-lg); }

  .ec-nav-toggle { display: inline-flex; }

  /*
   * O mobile hamburger co that, nen dua checkbox tro lai tab order.
   * Van an khoi mat bang kich thuoc 1px + opacity, khong dung display:none
   * vi selector :checked ~ .ec-nav can checkbox con nhan duoc focus.
   */
  .ec-nav-check {
    display: block;
    position: absolute;
    width: 1px;
    height: 1px;
    opacity: 0;
    pointer-events: none;
  }

  /*
   * Mobile: hang 1 = hamburger (trai) + switcher ngon ngu (phai),
   * menu xuong hang 2 chiem het chieu ngang.
   */
  .ec-navbar__inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
  }

  .ec-lang {
    margin-left: auto;
  }

  /*
   * .ec-nav co order:-1 o desktop de menu nam ben trai; tren mobile phai ve
   * dung thu tu DOM (hamburger + switcher hang 1, menu hang 2).
   */
  .ec-nav {
    order: 0;
    flex-basis: 100%;
  }

  /* Menu an mac dinh, mo khi checkbox duoc tick hoac co class .is-open */
  .ec-nav {
    display: none;
    padding-bottom: var(--ec-space-3);
  }

  .ec-nav-check:checked ~ .ec-nav,
  .ec-nav.is-open {
    display: block;
  }

  .ec-nav__list {
    display: block;
  }

  /* Padding ngang de chu khong sat mep khoi mau nen cua item (user chot 2026-08-23) */
  .ec-nav__link {
    padding: var(--ec-space-3) var(--ec-space-4);
    border-top: var(--ec-rule-width) solid var(--ec-border-on-navy);
    white-space: normal;
  }

  /* Tren mobile dropdown xo doc. Mac dinh an, chi mo nhom dang active. */
  .ec-nav__sub,
  .ec-nav__sub .ec-nav__sub {
    position: static;
    left: auto;
    top: auto;
    min-width: 0;
    border: 0;
    opacity: 1;
    visibility: visible;
    transform: none;
    background-color: transparent;
    padding-left: 0;
  }

  /* Chi hien khi parent co .is-open — neu khong, menu se mo tung tung */
  .ec-nav__item:not(.is-open) > .ec-nav__sub,
  .ec-nav__subitem:not(.is-open) > .ec-nav__sub {
    display: none;
  }

  .ec-nav__subitem { border-bottom: 0; }

  /* Submenu thut le theo cap de gi phan cap, nhung khong sat mep */
  .ec-nav__sublink {
    padding: var(--ec-space-2) var(--ec-space-4);
    padding-left: calc(var(--ec-space-4) * 2);
  }

  .ec-nav__sub--l3 .ec-nav__sublink {
    padding-left: calc(var(--ec-space-4) * 3);
  }

  /* Nut caret chi hien tren mobile: cham nut = mo/dong nhom, cham chu = di link */
  .ec-nav__caret {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    border: 0;
    background: transparent;
    color: var(--ec-on-blue);
    cursor: pointer;
  }

  .ec-nav__caret::after {
    content: "";
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 5px solid currentColor;
    transition: transform var(--ec-dur-fast) var(--ec-ease);
  }

  .ec-nav__caret[aria-expanded="true"]::after {
    transform: rotate(180deg);
  }

  /* Danh cho cho nut caret de chu khong bi che */
  .ec-nav__item--has-children > .ec-nav__link,
  .ec-nav__subitem--has-children > .ec-nav__sublink {
    padding-right: 44px;
  }

  /* Mui ten ::after cu bo di tren mobile vi da co nut caret */
  .ec-nav__item--has-children > .ec-nav__link::after { content: none; }

  .ec-nav__subitem--has-children > .ec-nav__sublink::after { content: none; }

  /* Search chiem het chieu ngang tren mobile */
  .ec-search__form {
    position: static;
    width: 100%;
    border: 0;
    padding: var(--ec-space-2) 0 0;
  }

  .ec-search__field { min-width: 0; flex: 1 1 auto; }
}