:root {
  --wd-brand-blue: #1668f5;
  --wd-brand-blue-dark: #1259e0;
  --wd-header-bg: #ffffff;
  --wd-header-text: #333333;
}

/* =====================
   Header wrapper
   ===================== */
/* =====================
   Logo banner (scrolls)
   ===================== */
.wd-banner {
  width: 100%;
  line-height: 0;
  background: #ffffff;
}

.wd-banner__img {
  width: 80%;
  height: auto;
  display: block;
  margin: 0 auto;
}

/* =====================
   Sticky nav bar
   ===================== */
.wd-header {
  background: var(--wd-header-bg);
  border-bottom: 3px solid var(--wd-brand-blue);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.wd-header__nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* =====================
   Main nav
   ===================== */
.wd-nav {
  flex: 1;
}

.wd-nav__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  align-items: center;
  gap: 0.1rem;
  flex-wrap: wrap;
}

.wd-nav__item {
  position: relative;
}

.wd-nav__link {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  padding: 0.6rem 0.75rem;
  color: var(--wd-header-text);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.92rem;
  border-radius: 4px;
  transition: color 0.15s ease, background 0.15s ease;
  white-space: nowrap;
}

.wd-nav__link:hover,
.wd-nav__link--active {
  color: var(--wd-brand-blue);
  background: rgba(62, 130, 214, 0.08);
  text-decoration: none;
}

.wd-nav__arrow {
  font-size: 0.55em;
  opacity: 0.7;
  transition: transform 0.2s ease;
  display: inline-block;
}

/* =====================
   Dropdown
   ===================== */
.wd-nav__dropdown {
  display: none;
  position: absolute;
  top: 100%;
  padding-top: 4px;
  left: 0;
  min-width: 200px;
  background: #ffffff;
  border: 1px solid #e8e8e8;
  border-top: 3px solid var(--wd-brand-blue);
  border-radius: 0 0 8px 8px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
  list-style: none;
  margin: 0;
  padding: 0.4rem 0;
  z-index: 200;
}

.wd-nav__item--has-dropdown:hover .wd-nav__dropdown,
.wd-nav__item--has-dropdown:focus-within .wd-nav__dropdown,
.wd-nav__item--has-dropdown.is-hovering .wd-nav__dropdown {
  display: block;
}

.wd-nav__item--has-dropdown:hover .wd-nav__arrow {
  transform: rotate(180deg);
}

.wd-nav__dropdown-link {
  display: block;
  padding: 0.5rem 1.1rem;
  color: var(--wd-header-text);
  text-decoration: none;
  font-size: 0.88rem;
  transition: color 0.12s ease, background 0.12s ease;
  white-space: nowrap;
}

.wd-nav__dropdown-link:hover {
  color: var(--wd-brand-blue);
  background: rgba(62, 130, 214, 0.06);
  text-decoration: none;
}

/* =====================
   Social icons
   ===================== */
.wd-social {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  flex-shrink: 0;
}

.wd-social__link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  color: #777;
  border-radius: 6px;
  transition: color 0.15s ease, transform 0.15s ease;
  text-decoration: none;
}

.wd-social__link:hover {
  color: var(--wd-brand-blue);
  transform: translateY(-2px);
  text-decoration: none;
}

.wd-social__link svg {
  width: 18px;
  height: 18px;
  fill: currentColor;
}

/* =====================
   Hamburger toggle
   ===================== */
.wd-nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 26px;
  height: 18px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
}

.wd-nav__toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--wd-header-text);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.2s ease;
}

/* =====================
   Mobile (≤768px)
   ===================== */
@media (max-width: 768px) {
  .wd-header__nav-inner {
    flex-wrap: wrap;
    padding: 0.5rem 1rem;
  }

  .wd-social {
    order: 1;
    flex: 1;
    justify-content: flex-start;
    padding: 0;
  }

  .wd-nav__toggle {
    display: flex;
    order: 2;
  }

  .wd-nav {
    order: 3;
    width: 100%;
    display: none;
  }

  .wd-nav.is-open {
    display: block;
  }

  .wd-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.4rem 0;
    border-top: 1px solid #ebebeb;
  }

  .wd-nav__link {
    border-radius: 0;
  }

  /* Always show dropdown on mobile */
  .wd-nav__item--has-dropdown .wd-nav__dropdown {
    display: block;
    position: static;
    box-shadow: none;
    border: none;
    border-top: none;
    border-radius: 0;
    background: #f6f8fc;
    padding: 0;
    margin: 0 0 0 1rem;
  }

  /* Hamburger → X */
  .wd-nav__toggle[aria-expanded="true"] .wd-nav__toggle-bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  .wd-nav__toggle[aria-expanded="true"] .wd-nav__toggle-bar:nth-child(2) {
    opacity: 0;
  }
  .wd-nav__toggle[aria-expanded="true"] .wd-nav__toggle-bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }
}

/* =====================
   Dark mode
   ===================== */
.dark .wd-header {
  --wd-header-bg: #1d1e20;
  --wd-header-text: #d4d4d4;
}

.dark .wd-nav__dropdown {
  background: #252628;
  border-color: #3a3a3a;
}

.dark .wd-social__link {
  color: #999;
}