/* ================================================
   HEADER
   ================================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: var(--z-fixed);
  background-color: rgba(17, 20, 57, 0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: background-color var(--transition-base), border-color var(--transition-base);
}

.header.is-scrolled {
  background-color: rgba(17, 20, 57, 0.95);
  border-bottom-color: var(--color-border);
}

.header__inner {
  display: flex;
  align-items: center;
  height: 100%;
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 var(--space-5);
  gap: var(--space-4);
}

@media (min-width: 768px) {
  .header__inner {
    padding: 0 var(--space-8);
  }
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-md);
  color: var(--color-text);
  white-space: nowrap;
  flex-shrink: 0;
  transition: opacity var(--transition-fast);
}

.header__logo:hover {
  opacity: 0.8;
}

.header__logo img {
  height: 1.75rem;
  width: auto;
}

/* ================================================
   DESKTOP NAVIGATION
   ================================================ */
.nav {
  display: none;
}

@media (min-width: 1024px) {
  .nav {
    display: flex;
    align-items: center;
    flex: 1;
    justify-content: center;
    min-width: 0;
  }
}

.nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav__link {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-muted);
  white-space: nowrap;
  border-radius: var(--radius-md);
  background: transparent;
  border: none;
  cursor: pointer;
  font-family: inherit;
  line-height: inherit;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav__link:hover {
  color: var(--color-text);
  background-color: var(--color-primary-subtle);
}

.nav__link.is-active {
  color: var(--color-primary-dark);
  background-color: var(--color-primary-bg);
  font-weight: var(--font-weight-semibold);
}

.nav__link--dropdown svg {
  width: 0.625rem;
  height: 0.375rem;
  flex-shrink: 0;
  transition: transform var(--transition-fast);
}

.nav__item--has-dropdown.is-open .nav__link--dropdown svg {
  transform: rotate(180deg);
}

/* ================================================
   DROPDOWN MENU
   ================================================ */
.nav__item--has-dropdown {
  position: relative;
}

.nav__dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  min-width: 13rem;
  background-color: var(--color-gray-800);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-2) 0;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transition-fast), visibility var(--transition-fast), transform var(--transition-fast);
  z-index: var(--z-dropdown);
}

.nav__item--has-dropdown.is-open .nav__dropdown {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.nav__dropdown-link {
  display: block;
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-muted);
  white-space: nowrap;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav__dropdown-link:hover {
  color: var(--color-text);
  background-color: var(--color-primary-subtle);
}

.nav__dropdown-link.is-active {
  color: var(--color-primary-dark);
  font-weight: var(--font-weight-semibold);
}

/* ================================================
   HEADER ACTIONS (right side)
   ================================================ */
.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
  margin-left: auto;
}

.lang-switcher {
  display: none;
  align-items: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

@media (min-width: 1024px) {
  .lang-switcher {
    display: flex;
  }
}

.lang-switcher--mobile {
  display: flex;
}

.lang-switcher__btn {
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-muted);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: color var(--transition-fast), background-color var(--transition-fast);
  line-height: 1.8;
}

.lang-switcher__btn:hover {
  color: var(--color-text);
}

.lang-switcher__btn.is-active {
  color: var(--color-white);
  background-color: var(--color-primary);
}

/* ================================================
   MOBILE MENU TOGGLE
   ================================================ */
.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--color-text);
  transition: background-color var(--transition-fast);
}

.menu-toggle:hover {
  background-color: var(--color-gray-700);
}

@media (min-width: 1024px) {
  .menu-toggle {
    display: none;
  }
}

.menu-toggle__icon {
  display: flex;
  flex-direction: column;
  gap: 5px;
  width: 1.25rem;
}

.menu-toggle__icon span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: currentColor;
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
  transform-origin: center;
}

.menu-toggle[aria-expanded="true"] .menu-toggle__icon span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-toggle__icon span:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] .menu-toggle__icon span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ================================================
   MOBILE NAV OVERLAY
   ================================================ */
.mobile-nav {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(17, 20, 57, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: var(--z-dropdown);
  padding: var(--space-6) var(--space-5);
  overflow-y: auto;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base);
}

.mobile-nav.is-open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

@media (min-width: 1024px) {
  .mobile-nav {
    display: none;
  }
}

.mobile-nav__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.mobile-nav__link {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  border-radius: var(--radius-lg);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.mobile-nav__link:hover,
.mobile-nav__link.is-active {
  background-color: var(--color-primary-subtle);
  color: var(--color-primary-dark);
}

.mobile-nav__group {
  margin-top: var(--space-3);
}

.mobile-nav__group-label {
  display: block;
  padding: var(--space-1) var(--space-4);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wider);
}

.mobile-nav__sublist {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.mobile-nav__sublist .mobile-nav__link {
  padding-left: var(--space-6);
}

.mobile-nav__footer {
  margin-top: var(--space-8);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: center;
}

/* ================================================
   MAIN CONTENT
   ================================================ */
.main {
  min-height: 100vh;
  padding-top: var(--header-height);
}

/* ================================================
   FOOTER
   ================================================ */
.footer {
  background-color: var(--color-gray-900);
  color: var(--color-gray-300);
  padding: var(--space-16) 0 var(--space-8);
}

@media (min-width: 768px) {
  .footer {
    padding-top: var(--space-20);
  }
}

.footer__grid {
  display: grid;
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}

@media (min-width: 768px) {
  .footer__grid {
    grid-template-columns: 1.5fr 1fr;
    gap: var(--space-12);
  }
}

.footer__brand {
  max-width: 22rem;
}

.footer__logo {
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-xl);
  color: var(--color-white);
  margin-bottom: var(--space-4);
}

.footer__tagline {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  color: var(--color-gray-400);
}

.footer__title {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-300);
  margin-bottom: var(--space-5);
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-wider);
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__links--two-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3) var(--space-6);
  max-width: 20rem;
}

.footer__link {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-primary-light);
}

.footer__bottom {
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  align-items: center;
  text-align: center;
}

@media (min-width: 768px) {
  .footer__bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer__copyright {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
}

.footer__trademark {
  font-size: var(--font-size-xs);
  color: var(--color-gray-500);
  margin-top: var(--space-1);
}

.footer__social {
  display: flex;
  gap: var(--space-3);
}

.footer__social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-md);
  color: var(--color-gray-400);
  background-color: rgba(255, 255, 255, 0.06);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.footer__social-link:hover {
  color: var(--color-white);
  background-color: var(--color-primary);
}

.footer__social-link svg {
  width: 1.125rem;
  height: 1.125rem;
}