.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-white);
  border-bottom: 1px solid rgba(36, 49, 43, 0.08);
}

.header.is-scrolled {
  box-shadow: var(--shadow-header);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-block: 14px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 21px;
  color: var(--color-primary);
}

.logo-mark {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
}

.logo-word .lingo-part {
  color: var(--color-text);
}

.nav-desktop {
  display: none;
}

.nav-desktop ul {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-desktop a {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-text);
  padding: 6px 2px;
  position: relative;
}

.nav-desktop a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition-base);
}

.nav-desktop a:hover::after {
  width: 100%;
}

.header-actions {
  display: none;
  align-items: center;
  gap: 12px;
}

.header-actions .btn {
  padding: 10px 18px;
  font-size: 15px;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--color-primary);
}

.nav-toggle:hover {
  background: var(--color-section);
}

.nav-toggle svg {
  width: 26px;
  height: 26px;
}

.icon-close { display: none; }
.nav-toggle[aria-expanded="true"] .icon-menu { display: none; }
.nav-toggle[aria-expanded="true"] .icon-close { display: block; }

/* Mobile drawer */
.mobile-drawer {
  position: fixed;
  inset: 0;
  top: 0;
  background: var(--color-white);
  z-index: 99;
  display: flex;
  flex-direction: column;
  padding: 96px 24px 32px;
  transform: translateX(100%);
  transition: transform var(--transition-slow);
  visibility: hidden;
}

.mobile-drawer.is-open {
  transform: translateX(0);
  visibility: visible;
}

.mobile-drawer ul {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 28px;
}

.mobile-drawer a {
  display: block;
  padding: 14px 6px;
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
  border-bottom: 1px solid var(--color-section);
}

.mobile-drawer-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.mobile-drawer-actions .btn {
  justify-content: center;
  width: 100%;
}

body.drawer-open {
  overflow: hidden;
}

@media (min-width: 1024px) {
  .nav-desktop {
    display: block;
  }
  .header-actions {
    display: flex;
  }
  .nav-toggle {
    display: none;
  }
}