.school-shell { min-height: 100vh; display: grid; grid-template-columns: var(--school-sidebar) minmax(0, 1fr); background: var(--school-bg); }
.school-shell__sidebar { position: sticky; top: 0; height: 100vh; overflow: auto; padding: 20px 14px; background: var(--school-surface); border-inline-end: 1px solid var(--school-border); }
.school-shell__brand { min-height: 52px; display: flex; align-items: baseline; gap: 8px; padding: 6px 10px 18px; }
.school-shell__brand strong { font-size: 20px; letter-spacing: -.025em; }
.school-shell__brand span { color: var(--school-muted); font-size: 12px; }
.school-shell__nav { display: grid; gap: 4px; }
.school-shell__nav-item { min-height: 42px; display: flex; align-items: center; padding: 9px 11px; border-radius: var(--school-radius); color: #35415a; text-decoration: none; font-size: 14px; font-weight: 620; }
.school-shell__nav-item:hover { background: var(--school-surface-subtle); }
.school-shell__nav-item.is-active { background: var(--school-primary-soft); color: var(--school-primary); font-weight: 750; }
.school-shell__main { min-width: 0; }
.school-shell__topbar { height: var(--school-topbar); position: sticky; top: 0; z-index: 30; display: flex; align-items: center; gap: 16px; padding: 0 24px; background: rgba(255,255,255,.96); border-bottom: 1px solid var(--school-border); backdrop-filter: blur(12px); }
.school-shell__crumb { font-weight: 700; }
.school-shell__account { margin-inline-start: auto; display: flex; align-items: center; gap: 12px; color: var(--school-muted); font-size: 13px; }
.school-shell__menu { display: none; border: 0; background: transparent; font-size: 20px; }
.school-shell__content { width: min(1440px, 100%); margin-inline: auto; padding: 28px 30px 48px; }
@media (max-width: 900px) {
  .school-shell { display: block; }
  .school-shell__sidebar { display: none; position: fixed; inset-block: 0; inset-inline-start: 0; width: min(300px, 86vw); z-index: 45; box-shadow: var(--school-shadow); }
  .school-shell.is-nav-open .school-shell__sidebar { display: block; }
  .school-shell__menu { display: inline-flex; }
  .school-shell__content { padding: 20px 16px 40px; }
  .school-shell__topbar { padding-inline: 14px; }
  .school-shell__account > span { display: none; }
}