/* ==========================================================================
   HEADER — thanh thương hiệu xanh: .site-logo · .site-nav (mega menu) · .site-header__btn
            .header-search · .tools-menu · .mega-panel
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: linear-gradient(135deg, #2F86DE 0%, #1B5CB0 100%);
  box-shadow: 0 4px 14px rgba(27, 92, 176, 0.25);
  color: #fff;
}

.site-header__bar {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 64px;
}

/* --------------------------------------------------------------------------
   Logo (header + footer: chữ trắng trên nền xanh / nền tối)
   -------------------------------------------------------------------------- */

.site-logo {
  gap: 10px;
  flex-shrink: 0;
  color: #fff;
  text-decoration: none !important;
}

.site-logo__icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.18);
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.site-logo:hover .site-logo__icon {
  transform: translateY(-1px) scale(1.05);
}

.site-logo__text {
  font-size: 21px;
  font-weight: 700;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.site-logo__light {
  font-weight: 300;
}

.site-logo--inverse,
.site-logo--inverse .site-logo__text {
  color: #fff;
}

/* --------------------------------------------------------------------------
   Menu: Việt Nam + châu lục (mỗi nút mở 1 mega panel)
   -------------------------------------------------------------------------- */

.site-nav {
  flex: 1;
  display: flex;
  justify-content: flex-end;
  min-width: 0;
}

.site-nav__list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav__toggle {
  padding: 9px 13px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.12);
  font: inherit;
  font-size: 14.5px;
  font-weight: 500;
  color: #fff;
  white-space: nowrap;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}

.site-nav__toggle:hover,
.site-nav__toggle.is-open {
  background: rgba(255, 255, 255, 0.24);
  border-color: rgba(255, 255, 255, 0.4);
}

/* Mục đang xem: gạch chân vàng (màu mặt trời của logo) */
.site-nav__toggle--current {
  box-shadow: inset 0 -2px 0 #FFC93C;
}

.site-nav__arrow {
  display: inline-block;
  margin-left: 2px;
  font-size: 11px;
  opacity: 0.8;
  transition: transform 0.2s;
}

.site-nav__toggle.is-open .site-nav__arrow {
  transform: rotate(180deg);
}

/* --------------------------------------------------------------------------
   Nút biểu tượng: tìm kiếm, công cụ, menu (mobile)
   -------------------------------------------------------------------------- */

.site-header__actions {
  gap: 6px;
  flex-shrink: 0;
}

.site-header__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 8px;
  background: transparent;
  color: #fff;
  cursor: pointer;
  transition: background 0.2s;
}

.site-header__btn:hover,
.site-header__btn.is-open {
  background: rgba(255, 255, 255, 0.2);
}

.site-header__btn--menu {
  display: none;
}

/* --------------------------------------------------------------------------
   Menu công cụ (dropdown)
   -------------------------------------------------------------------------- */

.tools-menu {
  position: relative;
}

.tools-menu__dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 120;
  min-width: 270px;
  padding: 6px 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  box-shadow: 0 16px 40px rgba(16, 36, 58, 0.18);
}

.tools-menu__item {
  display: block;
  padding: 10px 16px;
  font-size: 14px;
  color: var(--color-dark);
  white-space: nowrap;
  text-decoration: none !important;
}

.tools-menu__item:hover {
  background: var(--color-hover);
}

.tools-menu__item--all {
  font-weight: 600;
  border-bottom: 1px solid var(--color-border-soft);
}

/* --------------------------------------------------------------------------
   Panel thả xuống dưới thanh header: ô tìm kiếm, mega menu
   -------------------------------------------------------------------------- */

.header-search,
.mega-panel {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-surface-alt);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 18px 40px rgba(16, 36, 58, 0.14);
  color: var(--color-dark);
}

.header-search[hidden],
.mega-panel[hidden],
.tools-menu__dropdown[hidden] {
  display: none;
}

.header-search {
  padding: 14px 0;
}

.header-search .site-search {
  max-width: 720px;
  margin: 0 auto;
}

.mega-panel {
  max-height: calc(100vh - 64px);
  overflow-y: auto;
  overscroll-behavior: contain;
}

.mega-panel__inner {
  padding-top: 20px;
  padding-bottom: 24px;
}

.mega-panel__head {
  margin-bottom: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--color-border);
}

.mega-panel__cta {
  display: inline-block;
  padding: 8px 16px;
  border-radius: 8px;
  background: var(--color-primary);
  font-weight: 600;
  color: #fff !important;
  text-decoration: none !important;
}

.mega-panel__cta:hover {
  background: var(--color-primary-hover);
}

.mega-panel__link {
  font-weight: 500;
  color: var(--color-primary);
}

.mega-panel__group + .mega-panel__group {
  margin-top: 16px;
}

.mega-panel__group-title {
  margin-bottom: 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-subtext);
}

.mega-panel__list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 2px 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.mega-panel__list a {
  display: block;
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--color-dark);
  text-decoration: none !important;
}

.mega-panel__list a:hover {
  background: var(--color-hover);
  color: var(--color-primary);
}

/* --------------------------------------------------------------------------
   Ô tìm kiếm (autocomplete)
   -------------------------------------------------------------------------- */

.site-search {
  position: relative;
  min-width: 0;
}

.site-search__box {
  gap: 10px;
  height: 46px;
  padding: 0 14px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.site-search__box:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(40, 120, 208, 0.15);
}

.site-search__icon {
  stroke: var(--color-subtext);
}

.site-search__input {
  border: none;
  outline: none;
  background: transparent;
  font-family: inherit;
  font-size: 16px;
  color: var(--color-dark);
}

.site-search__results {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  z-index: 110;
  display: none;
  max-height: 380px;
  overflow-y: auto;
  padding: 6px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: 0 20px 45px rgba(16, 36, 58, 0.12);
}

.site-search__results--open {
  display: block;
}

.site-search__item {
  padding: 10px 14px;
  border-radius: var(--radius-xs);
  font-size: 14.5px;
  color: var(--color-dark);
  text-decoration: none !important;
  transition: background 0.15s;
}

.site-search__item:hover {
  background: var(--color-hover);
}

.site-search__item-name {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--color-dark);
}

.site-search__item-sub {
  font-size: 12.5px;
  color: var(--color-subtext);
}

.site-search__item-arrow {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-primary);
}

.site-search__empty {
  padding: 12px;
  font-size: 13.5px;
  color: var(--color-subtext);
}

/* --------------------------------------------------------------------------
   Tablet / mobile: menu gọn vào nút ☰ (danh sách dọc thả xuống)
   -------------------------------------------------------------------------- */

@media (max-width: 1199px) {
  .site-header__btn--menu {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    padding: 10px var(--container-gutter) 14px;
    background: var(--color-surface-alt);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 18px 40px rgba(16, 36, 58, 0.14);
  }

  .site-nav--open {
    display: block;
  }

  .site-nav__list {
    flex-direction: column;
    gap: 6px;
  }

  .site-nav__toggle {
    display: flex;
    justify-content: space-between;
    width: 100%;
    padding: 12px 14px;
    background: var(--color-surface);
    border-color: var(--color-border);
    font-size: 15px;
    color: var(--color-dark);
    text-align: left;
  }

  .site-nav__toggle:hover {
    background: var(--color-hover);
    border-color: var(--color-border-hover);
  }

  .site-nav__toggle--current {
    box-shadow: inset 3px 0 0 var(--color-primary);
  }
}

@media (max-width: 479px) {
  .site-header__bar {
    gap: 8px;
    min-height: 58px;
  }

  .site-logo {
    gap: 8px;
  }

  .site-logo__icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
  }

  .site-logo__text {
    font-size: 17px;
  }

  .site-header__actions {
    gap: 4px;
  }

  .site-header__btn {
    width: 36px;
    height: 36px;
  }

  .tools-menu__dropdown {
    position: fixed;
    top: 58px;
    left: 12px;
    right: 12px;
    min-width: 0;
  }

  .tools-menu__item {
    white-space: normal;
  }
}