.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--bg-white);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.2s;
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.navbar-logo {
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.navbar-logo-name {
  font-size: 22px;
  font-weight: 700;
  color: var(--charcoal);
  line-height: 1;
}

.navbar-logo-sub {
  font-size: 11px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
  white-space: nowrap;
}

.navbar-nav {
  display: flex;
  gap: var(--space-lg);
  align-items: center;
}

.nav-link {
  color: var(--text);
  font-weight: 500;
  font-size: var(--font-size-sm);
  transition: color 0.2s;
}

.nav-link:hover {
  color: var(--primary);
}

.nav-link.active {
  color: var(--primary);
  font-weight: 600;
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.navbar-zalo {
  padding: 10px 20px;
  font-size: var(--font-size-sm);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--charcoal);
  border-radius: 2px;
  transition: all 0.25s;
}

.hamburger.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.is-open span:nth-child(2) {
  opacity: 0;
}

.hamburger.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 68px;
  left: 0;
  right: 0;
  background-color: var(--bg-white);
  border-bottom: 1px solid var(--border);
  padding: var(--space-md);
  box-shadow: var(--shadow-lg);
  z-index: 999;
}

.mobile-menu.is-open {
  display: block;
}

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

.mobile-nav-link {
  color: var(--text);
  font-weight: 500;
  font-size: var(--font-size-lg);
  padding: var(--space-xs) 0;
  border-bottom: 1px solid var(--border);
  transition: color 0.2s;
}

.mobile-nav-link:hover {
  color: var(--primary);
}

@media (max-width: 767px) {
  .navbar-inner {
    min-height: 60px;
    height: auto;
    padding: 10px 0;
  }

  .navbar-logo-name {
    font-size: 16px;
  }

  .navbar-logo-sub {
    display: block;
    font-size: 10px;
    line-height: 1.25;
    white-space: normal;
    max-width: min(220px, calc(100vw - 100px));
  }

  .mobile-menu {
    top: 72px;
    left: 0;
    right: 0;
    width: 100%;
    padding: var(--space-md) var(--space-sm);
    box-sizing: border-box;
  }

  .navbar-nav {
    display: none;
  }

  .navbar-zalo {
    display: none;
  }

  .hamburger {
    display: flex;
    width: 44px;
    height: 44px;
    min-width: 44px;
    min-height: 44px;
    padding: 10px;
    align-items: center;
    justify-content: center;
  }

  .mobile-nav {
    gap: 16px;
  }

  .mobile-nav-link {
    padding: 12px 0;
  }
}