:root {
  --h: #0f172a;
  --tx: #ffffff;
  --hb: #1f2937;
  --panel: #0b1325;
  --mut: #cbd5e1;
  --app-bg: #0f172a;
  --app-bri: 1
}

.site-header {
  position: sticky;
  top: 0;
  background: var(--h);
  color: var(--tx);
  border-bottom: 1px solid var(--hb);
  z-index: 60
}

.container.navbar {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 16px
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--tx);
  text-decoration: none
}

.brand .logo {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: #111827
}

.brand-text {
  font-weight: 700
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 12px
}

.main-nav>a {
  padding: 8px 10px;
  border-radius: 10px;
  text-decoration: none;
  color: #ffffff
}

.main-nav>a:hover {
  background: #0b1224
}

.nav-group {
  position: relative
}

.nav-button {
  padding: 8px 10px;
  border-radius: 10px;
  background: transparent;
  border: 1px solid transparent;
  color: var(--tx);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px
}

.nav-button::after {
  content: "▾";
  font-size: 12px;
  transform: rotate(0deg);
  transition: transform .15s ease;
  opacity: .9
}

.nav-group.open .nav-button::after {
  transform: rotate(-180deg)
}

.nav-button:hover {
  background: #0b1224;
  border-color: #162033
}

.menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  background: var(--panel);
  border: 1px solid var(--hb);
  border-radius: 12px;
  min-width: 260px;
  padding: 12px;
  display: none;
  box-shadow: 0 8px 30px rgba(0, 0, 0, .35)
}

.menu .menu-title {
  font-weight: 700;
  color: #cbd5e1;
  margin: .2rem 0 .4rem
}

.menu a {
  display: block;
  padding: 6px 8px;
  border-radius: 8px;
  color: #ffffff;
  text-decoration: none
}

.menu a:hover {
  background: #0e1a35
}

.nav-group.open .menu {
  display: block
}

.menu.menu-wide {
  display: none;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  min-width: 520px
}

.nav-group.open .menu.menu-wide {
  display: grid
}

.nav-toggle {
  display: none;
  background: transparent;
  border: 0;
  color: var(--tx);
  font-size: 22px;
  border-radius: 10px;
  padding: 6px 10px;
  cursor: pointer
}

.nav-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .45);
  z-index: 59
}

@media (max-width:900px) {
  .main-nav {
    position: fixed;
    left: 0;
    right: 0;
    top: 58px;
    background: var(--h);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 10px;
    transform: translateY(-120%);
    transition: transform .2s ease;
    border-bottom: 1px solid var(--hb)
  }

  .main-nav.open {
    transform: translateY(0)
  }

  .menu {
    position: static;
    display: none;
    border: 1px solid var(--hb);
    margin: 8px 0
  }

  .menu.menu-wide {
    display: none;
    grid-template-columns: 1fr
  }

  .nav-group.open .menu {
    display: block
  }

  .nav-group.open .menu.menu-wide {
    display: grid
  }

  .nav-toggle {
    display: inline-block
  }

  .container.navbar {
    gap: 8px;
    padding: 10px 12px;
  }

  .brand-text {
    font-size: 0.95rem;
  }
}

.brand .logo {
  background: #3b82f6 !important;
  color: #0b1020 !important;
  box-shadow: 0 6px 18px rgba(59, 130, 246, .45);
}

.menu-group {
  position: relative
}

.menu-toggle {
  appearance: none;
  border: 1px solid var(--b);
  background: #0a1020;
  color: var(--fg);
  padding: 8px 12px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer
}

.submenu {
  display: none;
  position: absolute;
  top: 110%;
  left: 0;
  min-width: 220px;
  background: #0a1020;
  border: 1px solid var(--b);
  border-radius: 14px;
  box-shadow: var(--shadow-2);
  padding: 8px;
  z-index: 60
}

.menu-group.open>.submenu {
  display: block
}

@media(max-width:760px) {
  .main-nav {
    display: none;
    position: absolute;
    right: 20px;
    top: 64px;
    flex-direction: column;
    gap: 8px;
    background: #0a1020;
    border: 1px solid var(--b);
    border-radius: 14px;
    box-shadow: var(--shadow-2);
    width: min(96vw, 360px);
    padding: 10px;
    z-index: 70
  }

  .main-nav.open {
    display: flex
  }

  .submenu {
    position: static;
    display: none;
    border-radius: 12px;
    margin: 6px 0
  }

  .menu-group.open>.submenu {
    display: block
  }
}

.menu-group {
  position: relative
}

.menu-toggle {
  appearance: none;
  border: 1px solid var(--b);
  background: var(--bg, #0a1020);
  color: var(--fg, #e5e7eb);
  padding: 8px 12px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer
}

.submenu {
  display: none;
  position: absolute;
  top: 110%;
  left: 0;
  min-width: 220px;
  background: var(--bg, #0a1020);
  border: 1px solid var(--b);
  border-radius: 14px;
  box-shadow: var(--shadow-2);
  padding: 8px;
  z-index: 60
}

.menu-group.open>.submenu {
  display: block
}

@media(max-width:760px) {
  .main-nav {
    display: none;
    position: absolute;
    right: 20px;
    top: 64px;
    flex-direction: column;
    gap: 8px;
    background: var(--bg, #0a1020);
    border: 1px solid var(--b);
    border-radius: 14px;
    box-shadow: var(--shadow-2);
    width: min(96vw, 360px);
    padding: 10px;
    z-index: 70
  }

  .main-nav.open {
    display: flex
  }

  .submenu {
    position: static;
    display: none;
    border-radius: 12px;
    margin: 6px 0
  }

  .menu-group.open>.submenu {
    display: block
  }
}