.shell {
  display: flex;
  width: 100%;
  max-width: 1100px;
  min-height: calc(100vh - 40px);
  margin: 0 auto;
}

.site-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 220px;
  flex: 0 0 220px;
  padding: 24px 12px;
}

.nav-link {
  display: block;
  padding: 10px 14px;
  border-radius: 10px;
  color: #fff;
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.12);
  transition: background 0.15s ease;
}

.nav-link:hover {
  background: rgba(255, 255, 255, 0.28);
}

.nav-link[aria-current='page'] {
  background: rgba(255, 255, 255, 0.9);
  color: #222;
}

.shell-main {
  flex: 1 1 auto;
  min-width: 0;
  overflow-y: auto;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 24px 12px;
}

.nav-toggle {
  display: none;
}

@media (max-width: 800px) {
  .shell {
    display: block;
  }

  .nav-toggle {
    display: block;
    margin: 0 0 12px;
    padding: 10px 16px;
    border: none;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.35);
    color: #fff;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
  }

  .site-nav {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 20;
    width: 220px;
    background: var(--shell-nav-bg, #2575fc);
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.35);
    transform: translateX(-100%);
    transition: transform 0.2s ease;
  }

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

  .shell-main {
    display: block;
    padding: 0;
  }
}