.nav-container {
  position: relative;
  flex-wrap: nowrap;
  gap: 12px;
}

.nav-toggle {
  display: none;
  flex-shrink: 0;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  margin-left: auto;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  background: #ffffff;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}

.nav-toggle:hover {
  background: #f8fafc;
  border-color: #cbd5e1;
}

.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: #1e3c72;
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.2s ease;
}

body.nav-open .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

body.nav-open .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}

body.nav-open .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav-backdrop {
  display: none;
}

.nav-panel {
  display: flex;
  align-items: center;
}

.nav-menu {
  display: flex;
  gap: 28px;
  list-style: none;
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
}

.nav-menu a {
  text-decoration: none;
  font-weight: 500;
  color: #2c3e50;
  transition: color 0.2s;
}

.nav-menu a:hover {
  color: #1e4a76;
}

@media (max-width: 900px) {
  .header {
    z-index: 1001;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(15, 30, 44, 0.55);
    z-index: 1002;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    backdrop-filter: blur(2px);
  }

  body.nav-open .nav-backdrop {
    opacity: 1;
    pointer-events: auto;
  }

  .nav-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: min(320px, 88vw);
    height: 100vh;
    height: 100dvh;
    background: #ffffff;
    z-index: 1003;
    flex-direction: column;
    align-items: stretch;
    padding: 88px 24px 32px;
    box-shadow: -12px 0 40px rgba(0, 0, 0, 0.12);
    transform: translateX(100%);
    transition: transform 0.3s ease;
    overflow-y: auto;
  }

  body.nav-open .nav-panel {
    transform: translateX(0);
  }

  .nav-panel::before {
    content: "Menu";
    position: absolute;
    top: 24px;
    left: 24px;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #64748b;
  }

  .nav-menu {
    flex-direction: column;
    gap: 0;
    width: 100%;
  }

  .nav-menu li {
    border-bottom: 1px solid #f1f5f9;
  }

  .nav-menu li:last-child {
    border-bottom: none;
  }

  .nav-menu a {
    display: block;
    padding: 16px 4px;
    font-size: 1.05rem;
    color: #0f2b3d;
  }

  .nav-menu a:hover {
    color: #1e4a76;
    background: #f8fafc;
    margin: 0 -8px;
    padding-left: 12px;
    padding-right: 12px;
    border-radius: 8px;
  }
}

@media (max-width: 480px) {
  .header-operator {
    font-size: 0.62rem;
  }
  .logo {
    font-size: 1.35rem;
  }
}