/* ============================================
   Edu2Future LLC - Responsive Header
   ============================================ */

.topbar {
  position: relative;
  z-index: 1001;
  background: var(--color-navy);
  color: var(--color-white);
  font-size: 0.9rem;
}

.topbar-inner {
  width: min(100%, 1720px);
  min-height: 46px;
  margin: 0 auto;
  padding: 0 clamp(18px, 4vw, 64px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.topbar-promo {
  margin: 0;
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--color-white);
  font-weight: var(--fw-semibold);
  line-height: 1.35;
}

.topbar-mark {
  color: var(--color-gold);
}

.topbar-contact {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: clamp(14px, 2vw, 28px);
  font-weight: var(--fw-semibold);
  white-space: nowrap;
}

.topbar-contact a,
.topbar-lang {
  color: var(--color-white);
  opacity: 0.96;
  transition: opacity var(--transition-fast), color var(--transition-fast);
}

.topbar-contact a:hover,
.topbar-lang:hover {
  color: var(--color-gold);
  opacity: 1;
}

.topbar-lang {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 34px;
}

.navbar {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--navbar-height);
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid rgba(229, 231, 235, 0.75);
  z-index: 1000;
  backdrop-filter: blur(18px);
  transition: box-shadow var(--transition-base), background var(--transition-base);
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 12px 28px rgba(11, 31, 58, 0.08);
}

.navbar-inner {
  width: min(100%, 1720px);
  height: 100%;
  margin: 0 auto;
  padding: 0 clamp(18px, 4vw, 64px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(18px, 2.4vw, 44px);
}

.navbar-brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  min-width: max-content;
}

.navbar-brand img {
  width: auto;
  height: clamp(38px, 3.5vw, 54px);
}

.navbar-brand-text {
  display: none;
  color: var(--color-navy);
  font-size: 1.5rem;
  font-weight: var(--fw-extrabold);
  line-height: 1;
}

.navbar-brand-text .gold,
.navbar-brand-text .gold-accent {
  color: var(--color-gold);
}

.navbar-nav {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: clamp(8px, 1.2vw, 22px);
  height: 100%;
  min-width: 0;
  flex: 1 1 auto;
}

.nav-item {
  position: relative;
  display: flex;
  align-items: center;
  height: 100%;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 100%;
  color: var(--color-navy);
  font-size: clamp(0.88rem, 0.78vw, 1rem);
  font-weight: var(--fw-semibold);
  white-space: nowrap;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 20px;
  height: 3px;
  border-radius: 999px;
  background: var(--color-gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.nav-link:hover,
.nav-item.active .nav-link {
  color: var(--color-primary-dark);
}

.nav-link:hover::after,
.nav-item.active .nav-link::after {
  transform: scaleX(1);
}

.chevron {
  font-size: 0.82em;
  line-height: 1;
}

.mega-menu {
  position: absolute;
  top: calc(100% - 8px);
  left: 50%;
  min-width: 320px;
  padding: 20px;
  display: flex;
  gap: 18px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: 0 24px 60px rgba(11, 31, 58, 0.14);
  opacity: 0;
  visibility: hidden;
  transform: translate(-50%, 12px);
  transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base);
}

.nav-item.dropdown:hover .mega-menu,
.nav-item.dropdown:focus-within .mega-menu {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

.mega-column {
  display: flex;
  min-width: 150px;
  flex-direction: column;
  gap: 4px;
}

.mega-label {
  padding: 0 10px 8px;
  color: var(--color-gold-dark);
  font-size: 0.72rem;
  font-weight: var(--fw-bold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.mega-link {
  display: block;
  padding: 10px;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: var(--fw-semibold);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.mega-link:hover {
  background: var(--color-surface);
  color: var(--color-navy);
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1vw, 16px);
  flex: 0 0 auto;
}

.btn {
  min-height: 44px;
  min-width: 44px;
  padding: 13px 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: var(--fw-bold);
  line-height: 1.15;
  text-align: center;
  white-space: nowrap;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--color-navy);
  border-color: var(--color-navy);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary-light);
  box-shadow: 0 14px 28px rgba(11, 31, 58, 0.18);
}

.btn-secondary,
.btn-gold {
  background: #C99A54;
  border-color: #C99A54;
  color: var(--color-white);
}

.btn-secondary:hover,
.btn-gold:hover {
  background: #B7853F;
  border-color: #B7853F;
  box-shadow: 0 14px 28px rgba(201, 154, 84, 0.22);
}

.btn-ghost {
  background: transparent;
  border-color: var(--color-navy);
  color: var(--color-navy);
}

.hamburger {
  display: none;
  width: 46px;
  height: 46px;
  flex: 0 0 auto;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border-radius: 8px;
  background: var(--color-navy);
}

.hamburger-line {
  display: block;
  width: 22px;
  height: 2px;
  border-radius: 999px;
  background: var(--color-white);
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.hamburger.active .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.hamburger.active .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.drawer-overlay {
  position: fixed;
  inset: 0;
  z-index: 1099;
  background: rgba(11, 31, 58, 0.48);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.drawer-overlay.show {
  opacity: 1;
  visibility: visible;
}

.mobile-drawer {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 1100;
  width: min(420px, 92vw);
  height: 100vh;
  height: 100dvh;
  padding: 22px;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  background: var(--color-white);
  box-shadow: -30px 0 70px rgba(11, 31, 58, 0.16);
  transform: translateX(100%);
  transition: transform var(--transition-slow);
}

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

.drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--color-border);
}

.drawer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-navy);
  font-size: 1.25rem;
  font-weight: var(--fw-extrabold);
}

.drawer-logo img {
  height: 42px;
  width: auto;
}

.drawer-close {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: var(--color-surface);
  color: var(--color-navy);
  font-size: 1.75rem;
  line-height: 1;
}

.mobile-nav {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  gap: 4px;
  padding: 20px 0;
}

.mobile-nav-link {
  width: 100%;
  min-height: 48px;
  padding: 12px 4px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--color-navy);
  font-size: 1rem;
  font-weight: var(--fw-bold);
  text-align: left;
}

.accordion-arrow {
  transition: transform var(--transition-base);
}

.accordion-arrow.open {
  transform: rotate(180deg);
}

.mobile-submenu {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base), padding-bottom var(--transition-base);
}

.mobile-submenu.open {
  max-height: 420px;
  padding-bottom: 8px;
}

.mobile-sub-link {
  display: block;
  padding: 10px 14px;
  color: var(--color-text-secondary);
  font-size: 0.93rem;
  font-weight: var(--fw-semibold);
}

.drawer-bottom {
  padding-top: 18px;
  border-top: 1px solid var(--color-border);
}

.drawer-lang {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.drawer-lang-badge {
  padding: 8px 12px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-navy);
  font-size: 0.85rem;
  font-weight: var(--fw-bold);
}

.drawer-lang-badge.active {
  border-color: var(--color-gold);
  background: var(--color-gold-bg);
}

.drawer-buttons {
  display: grid;
  gap: 10px;
}

.drawer-buttons .btn {
  width: 100%;
}

@media (max-width: 1320px) {
  .navbar-nav {
    gap: 12px;
  }

  .navbar-actions .btn {
    padding-inline: 18px;
  }
}

@media (max-width: 1180px) {
  .navbar-nav,
  .navbar-actions {
    display: none;
  }

  .hamburger {
    display: flex;
  }
}

@media (max-width: 820px) {
  :root {
    --navbar-height: 74px;
  }

  .topbar-contact {
    display: none;
  }

  .topbar-inner {
    min-height: 42px;
    justify-content: center;
    text-align: center;
  }

  .topbar-promo {
    justify-content: center;
    gap: 10px;
    font-size: 0.82rem;
  }
}

@media (max-width: 520px) {
  .navbar-inner {
    padding-inline: 16px;
  }

  .navbar-brand img {
    height: 42px;
  }

  .topbar-inner {
    padding-inline: 14px;
  }

  .topbar-promo {
    font-size: 0.76rem;
  }

  .mobile-drawer {
    width: 100%;
    max-width: 100%;
  }
}