.shell {
  display: grid;
  grid-template-columns: var(--sidebar) 1fr;
  grid-template-rows: var(--topbar) 1fr;
  min-height: 100vh;
}
.shell-sidebar {
  grid-row: 1 / span 2;
  background: var(--bg-raised);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.brand {
  height: var(--topbar);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0 var(--space-4);
  border-bottom: 1px solid var(--border);
  font-weight: 650;
  letter-spacing: 0.02em;
  font-size: var(--text-sm);
}
.brand-mark {
  width: 22px;
  height: 22px;
  border-radius: 4px;
  background: var(--accent);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 11px;
  font-weight: 700;
  flex-shrink: 0;
}
.nav {
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}
.nav a {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  text-decoration: none;
  font-size: var(--text-sm);
}
.nav a:hover { background: var(--bg-overlay); color: var(--text); text-decoration: none; }
.nav a.active {
  background: var(--accent-muted);
  color: var(--accent-hover);
  font-weight: 600;
}
.nav svg { width: 16px; height: 16px; flex-shrink: 0; }
.nav-count {
  margin-left: auto;
  min-width: 18px;
  height: 18px;
  padding: 0 6px;
  border-radius: 9px;
  background: var(--bg-overlay);
  color: var(--text-muted);
  font-size: 11px;
  display: grid;
  place-items: center;
}
.nav a.active .nav-count { background: var(--accent); color: #fff; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: 0 var(--space-5);
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  min-width: 0;
}
.topbar-title { font-size: var(--text-sm); color: var(--text-muted); min-width: 0; }
.topbar-user {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
}
.avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--bg-overlay);
  border: 1px solid var(--border);
  object-fit: cover;
  flex-shrink: 0;
}
.main {
  overflow: auto;
  padding: var(--space-6);
  min-width: 0;
}
.page { max-width: 1280px; }
.page-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}
.page-head h1 { margin-bottom: 4px; }
.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
  margin-bottom: var(--space-4);
}

.auth-screen {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: var(--space-6);
}
.auth-card {
  width: 100%;
  max-width: 400px;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-8);
}
.auth-card h1 { margin-bottom: 6px; }
.auth-card .lead { color: var(--text-muted); margin-bottom: var(--space-6); font-size: var(--text-sm); }

.split {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 0;
  min-height: calc(100vh - var(--topbar) - 48px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--bg-raised);
}
.split-list { border-right: 1px solid var(--border); overflow: auto; }
.split-pane { overflow: auto; min-width: 0; }

@media (max-width: 1100px) {
  .shell { grid-template-columns: var(--sidebar-collapsed) 1fr; }
  .brand-text, .nav a span, .nav-count { display: none; }
  .nav a { justify-content: center; padding: 10px; }
  .split { grid-template-columns: 1fr; }
  .split-list { max-height: 240px; border-right: 0; border-bottom: 1px solid var(--border); }
}
@media (max-width: 800px) {
  .shell {
    grid-template-columns: 1fr;
    grid-template-rows: auto var(--topbar) 1fr;
  }
  .shell-sidebar {
    grid-row: 1;
    flex-direction: row;
    align-items: center;
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }
  .brand { border-bottom: 0; }
  .nav { flex-direction: row; overflow-x: auto; padding: 6px; }
  .main { padding: var(--space-4); }
}