.header {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(224, 224, 224, 0.5);
  color: #000000;
  padding: 20px 0;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header .container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
}

.header .logo {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 26px;
  font-weight: 700;
  text-decoration: none;
  color: #005DA6;
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.header nav {
  display: flex;
  align-items: center;
  gap: 30px;
}

.header nav a {
  color: #616161;
  text-decoration: none;
  position: relative;
  font-weight: 500;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.header nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, #00A4EF, #005DA6);
  transition: width 0.3s ease;
}

.header nav a:hover {
  color: #00A4EF;
  transform: translateY(-1px);
}

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

.header nav a[href="/app"] {
  background: #1F2937;
  color: #FFFFFF;
  padding: 10px 24px;
  border-radius: 8px;
  margin-left: 10px;
}

.header nav a[href="/app"]:hover {
  background: #111827;
  transform: translateY(-2px);
}

.header nav a[href="/app"]::after {
  display: none;
}

.lang-selector {
  position: relative;
  margin-left: 24px;
}

.lang-btn {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #616161;
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.3s ease;
}

.lang-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.3);
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: #FFFFFF;
  border: 1px solid #E5E7EB;
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
  min-width: 200px;
  display: none;
  z-index: 1000;
  overflow: hidden;
}

.lang-dropdown.active {
  display: block;
}

.lang-option {
  padding: 12px 16px;
  cursor: pointer;
  transition: background 0.2s ease;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 14px;
  color: #333;
  border: none;
  width: 100%;
  text-align: left;
  background: none;
}

.lang-option:hover {
  background: #F3F4F6;
}

.lang-option.active {
  background: #EEF2FF;
  color: #005DA6;
  font-weight: 600;
}

.lang-flag {
  font-size: 20px;
  line-height: 1;
}

.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  border: 1px solid #E5E7EB;
  background: #FFFFFF;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.06);
  cursor: pointer;
  padding: 10px;
  gap: 6px;
  flex-direction: column;
  transition: all 0.2s ease;
}

.menu-toggle span {
  width: 100%;
  height: 2px;
  background: #111827;
  border-radius: 999px;
  transition: all 0.25s ease;
}

.header.nav-open .menu-toggle span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.header.nav-open .menu-toggle span:nth-child(2) {
  opacity: 0;
}

.header.nav-open .menu-toggle span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

@media (max-width: 960px) {
  .header.menu-enabled {
    padding: 14px 0;
  }

  .header.menu-enabled .container {
    align-items: center;
    gap: 12px;
  }

  .header.menu-enabled .menu-toggle {
    display: inline-flex;
  }

  .header.menu-enabled nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #FFFFFF;
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding: 16px 20px 20px;
    border-bottom: 1px solid #E5E7EB;
    box-shadow: 0 14px 30px rgba(0, 0, 0, 0.08);
    display: none;
  }

  .header.menu-enabled.nav-open nav {
    display: flex;
  }

  .header.menu-enabled nav a {
    width: 100%;
    padding: 10px 0;
  }

  .header.menu-enabled nav a[href="/app"] {
    width: 100%;
    text-align: center;
    margin-left: 0;
  }

  .header.menu-enabled .lang-selector {
    width: 100%;
    margin-left: 0;
  }

  .header.menu-enabled .lang-btn {
    width: 100%;
    justify-content: space-between;
  }

  .header.menu-enabled .lang-dropdown {
    position: relative;
    top: 8px;
    right: auto;
    width: 100%;
    box-shadow: none;
    border: 1px solid #E5E7EB;
  }
}