/* App shell: sidebar + topbar + content. Mobile first. */
html { -webkit-text-size-adjust: 100%; }
body { background: var(--plbm-bg); color: var(--plbm-text); font-family: var(--plbm-font); font-size: 15px; line-height: 1.55; }
h1, h2, h3, h4, h5 { font-family: var(--plbm-font-head); letter-spacing: -.01em; color: var(--plbm-text); }
a { text-decoration-thickness: 1px; text-underline-offset: 2px; }
:focus-visible { outline: none; box-shadow: var(--plbm-focus); border-radius: 6px; }
.skip-link { position: absolute; left: -999px; top: 8px; background: var(--plbm-primary); color: var(--plbm-on-primary); padding: 8px 14px; border-radius: 8px; z-index: 2000; }
.skip-link:focus { left: 8px; }

.shell { display: grid; grid-template-columns: 1fr; min-height: 100vh; }
.sidebar { position: fixed; inset: 0 auto 0 0; width: 264px; transform: translateX(-100%); transition: transform .2s ease; z-index: 1040;
  background: var(--plbm-surface); border-right: 1px solid var(--plbm-border); display: flex; flex-direction: column; padding: 18px 14px; overflow-y: auto; }
.sidebar.open { transform: none; box-shadow: var(--plbm-shadow); }
.sidebar-backdrop { display: none; position: fixed; inset: 0; background: rgba(0, 0, 0, .4); z-index: 1030; }
.sidebar.open + .sidebar-backdrop { display: block; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; padding: 4px 8px 18px; color: var(--plbm-text); }
.brand-mark { width: 38px; height: 38px; border-radius: 12px; background: var(--plbm-primary); display: grid; place-items: center; flex: none; }
.brand-mark svg { width: 24px; height: 24px; }
.brand-name { font-family: var(--plbm-font-head); font-weight: 800; font-size: 16px; line-height: 1.1; }
.brand-sub { font-size: 11.5px; color: var(--plbm-text-muted); font-weight: 500; }
.nav-group { font-size: 11px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--plbm-text-muted); padding: 14px 10px 6px; }
.nav-link-item { display: flex; align-items: center; gap: 10px; padding: 9px 10px; min-height: 40px; border-radius: 10px; color: var(--plbm-text); text-decoration: none; font-weight: 500; }
.nav-link-item i { font-size: 17px; color: var(--plbm-text-muted); }
.nav-link-item:hover { background: var(--plbm-surface-2); }
.nav-link-item.active { background: var(--plbm-primary-soft); color: var(--plbm-primary); font-weight: 650; }
.nav-link-item.active i { color: var(--plbm-primary); }
.sidebar-foot { margin-top: auto; padding-top: 14px; border-top: 1px solid var(--plbm-border); font-size: 13px; }

.main { min-width: 0; display: flex; flex-direction: column; }
.topbar { position: sticky; top: 0; z-index: 1020; display: flex; align-items: center; gap: 10px; padding: 10px 16px;
  background: color-mix(in srgb, var(--plbm-bg) 88%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--plbm-border); }
.topbar .spacer { flex: 1; }
.icon-btn { display: inline-grid; place-items: center; width: 40px; height: 40px; border-radius: 10px; border: 1px solid var(--plbm-border);
  background: var(--plbm-surface); color: var(--plbm-text); cursor: pointer; text-decoration: none; }
.icon-btn:hover { background: var(--plbm-surface-2); }
.user-chip { display: flex; align-items: center; gap: 10px; font-size: 13px; line-height: 1.2; }
.user-chip .avatar { width: 36px; height: 36px; border-radius: 50%; background: var(--plbm-primary); color: var(--plbm-on-primary); display: grid; place-items: center; font-weight: 700; flex: none; }
.user-chip small { color: var(--plbm-text-muted); display: block; }
.content { padding: 20px 16px 48px; width: 100%; }
.page-head { display: flex; flex-wrap: wrap; align-items: flex-end; gap: 10px 20px; margin-bottom: 18px; }
.page-head h1 { font-size: 24px; font-weight: 800; margin: 0; }
.page-head p { margin: 2px 0 0; color: var(--plbm-text-muted); }
.page-head .actions { margin-left: auto; display: flex; gap: 8px; flex-wrap: wrap; }

@media (min-width: 992px) {
  .shell { grid-template-columns: 264px 1fr; }
  .sidebar { position: sticky; top: 0; height: 100vh; transform: none; }
  .sidebar-backdrop, #menu-toggle { display: none !important; }
  .content { padding: 28px 32px 56px; }
}
@media print { .sidebar, .topbar, .no-print { display: none !important; } .shell { display: block; } body { background: #fff; } }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }