header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--gradient-midnight);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding: 12px 0;
  transition:
    transform 0.25s ease,
    box-shadow 0.25s ease;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
}

.sidebar-brand {
  color: #fff;
  font-size: 1.6rem;
  font-weight: 800;
}

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: rgba(255, 255, 255, 0.86);
  text-decoration: none;
  font-weight: 600;
  padding: 8px 0;
  position: relative;
  white-space: nowrap;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--mint);
  transition: width 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: #fff;
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

.nav-actions .btn {
  font-size: 0.9rem;
  padding: 10px 20px;
}

.lang-form {
  display: flex;
  align-items: center;
}

.lang-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(10px);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.16);
}

.lang-select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background: transparent;
  border: none;
  color: rgba(255, 255, 255, 0.92);
  font-weight: 600;
  font-size: 0.9rem;
  line-height: 1;
  padding: 0 24px 0 2px;
  outline: none;
  cursor: pointer;
  font-family:
    "Helvetica Neue Light",
    "Helvetica Neue",
    Helvetica,
    Arial,
    "Apple Color Emoji",
    "Segoe UI Emoji",
    "Noto Color Emoji",
    sans-serif;
}

.lang-select option {
  color: #0f172a;
  font-family:
    "Helvetica Neue Light",
    "Helvetica Neue",
    Helvetica,
    Arial,
    "Apple Color Emoji",
    "Segoe UI Emoji",
    "Noto Color Emoji",
    sans-serif;
}

.lang-caret {
  margin-left: -18px;
  pointer-events: none;
  color: rgba(255, 255, 255, 0.75);
  font-size: 0.75rem;
}

.menu-btn {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.mobile-nav {
  display: none;
  position: fixed;
  top: 72px;
  left: 0;
  width: 100%;
  background: rgba(0, 8, 20, 0.96);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  z-index: 999;
  padding: 16px 0;
}

.mobile-nav.open {
  display: block;
}

.mobile-nav .container {
  display: grid;
  gap: 14px;
}

.mobile-links {
  list-style: none;
  display: grid;
  gap: 10px;
}

.mobile-links a {
  display: block;
  padding: 12px 14px;
  border-radius: 14px;
  text-decoration: none;
  color: rgba(255, 255, 255, 0.92);
  font-weight: 700;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.05);
}

.mobile-links a:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}

.mobile-actions {
  display: grid;
  gap: 10px;
}

.mobile-actions .btn {
  width: 100%;
}

@media (max-width: 860px) {
  .nav-links {
    display: none;
  }

  .menu-btn {
    display: inline-flex;
  }

  .nav-actions .btn {
    display: none;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }
}