.site-shell {
  display: grid;
  grid-template-columns: var(--sidebar-width, 250px) minmax(0, 1fr);
  min-height: 100vh;
  transition: grid-template-columns 180ms ease;
}

.site-shell.sidebar-collapsed {
  --sidebar-width: 76px;
}

.site-sidebar {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  overflow-x: hidden;
  overflow-y: auto;
  border-right: 1px solid var(--line);
  background: rgba(251, 250, 247, 0.96);
  padding: 1rem 0.85rem 2rem;
}

.site-sidebar-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.45rem;
  margin-bottom: 1.1rem;
}

.site-sidebar-brand {
  display: block;
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  overflow: hidden;
  border-radius: 50%;
  border: 1px solid rgba(22, 22, 22, 0.5);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.12);
}

.site-sidebar-brand img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.25);
}

.site-sidebar-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  padding: 0;
  flex-shrink: 0;
}

.site-sidebar-toggle:hover {
  background: #faf8f2;
}

.site-nav-group + .site-nav-group {
  margin-top: 1.4rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
}

.site-nav-label {
  margin: 0 0 0.55rem;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 700;
  white-space: nowrap;
}

.site-nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.2rem;
}

.site-nav-list a,
.site-nav-list button {
  display: block;
  width: 100%;
  text-align: left;
  border: 1px solid transparent;
  background: transparent;
  color: var(--ink);
  text-decoration: none;
  font: inherit;
  font-size: 0.92rem;
  padding: 0.45rem 0.55rem;
  border-radius: 4px;
  cursor: pointer;
  white-space: nowrap;
}

.site-nav-list a:hover,
.site-nav-list button:hover,
.site-nav-list a.active,
.site-nav-list button.active {
  border-color: var(--line);
  background: #fff;
}

.site-main {
  min-width: 0;
}

.site-main .topbar {
  position: sticky;
}

.site-main .topbar nav {
  margin-left: auto;
}

.site-main main {
  max-width: 980px;
}

.mobile-nav-toggle {
  display: none;
}

.site-shell.sidebar-collapsed .site-sidebar-head {
  flex-direction: column;
  align-items: center;
  margin-bottom: 0.75rem;
}

.site-shell.sidebar-collapsed .site-sidebar-toggle {
  margin-top: 0.35rem;
}

.site-shell.sidebar-collapsed .site-nav-group {
  display: none;
}

@media (min-width: 961px) {
  .site-sidebar-toggle {
    display: inline-flex;
  }
}

@media (max-width: 960px) {
  .site-shell,
  .site-shell.sidebar-collapsed {
    --sidebar-width: 0;
    grid-template-columns: 1fr;
  }

  .mobile-nav-toggle {
    display: inline-flex;
  }

  .site-sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    width: min(84vw, 290px);
    z-index: 50;
    transform: translateX(-105%);
    transition: transform 180ms ease;
    box-shadow: 0 0 0 rgba(0, 0, 0, 0);
    padding: 1.2rem 1rem 2rem;
  }

  .site-sidebar.open {
    transform: translateX(0);
    box-shadow: 12px 0 30px rgba(18, 24, 32, 0.12);
  }

  .site-sidebar.open .site-nav-group {
    display: block;
  }

  .site-sidebar-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(18, 24, 32, 0.35);
    z-index: 45;
    opacity: 0;
    pointer-events: none;
    transition: opacity 180ms ease;
  }

  .site-sidebar-backdrop.open {
    opacity: 1;
    pointer-events: auto;
  }
}