.shell { min-height: 100vh; display: grid; grid-template-columns: var(--sidebar-width) 1fr; }
.sidebar {
  position: fixed; inset: 0 auto 0 0; width: var(--sidebar-width); z-index: 40;
  display: flex; flex-direction: column; background: var(--bg-elevated); border-right: 1px solid var(--border);
}
.sidebar-brand { height: var(--header-height); display: flex; align-items: center; gap: 12px; padding: 0 18px; border-bottom: 1px solid var(--border); }
.brand-mark { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 10px; background: var(--accent-soft); color: var(--accent); font-weight: 800; letter-spacing: -.04em; }
.brand-copy strong { display: block; font-size: 14px; }
.brand-copy span { display: block; margin-top: 2px; color: var(--text-muted); font-size: 11px; }
.sidebar-nav { padding: 16px 12px; display: grid; gap: 4px; overflow: auto; }
.nav-label { padding: 10px 10px 6px; color: var(--text-soft); text-transform: uppercase; letter-spacing: .08em; font-size: 10px; font-weight: 700; }
.nav-item { display: flex; align-items: center; gap: 11px; min-height: 42px; padding: 0 12px; border-radius: 10px; color: var(--text-muted); transition: var(--transition); }
.nav-item:hover { background: var(--surface-2); color: var(--text); }
.nav-item.active { color: var(--accent); background: var(--accent-soft); }
.nav-item svg { width: 18px; height: 18px; flex: 0 0 auto; }
.sidebar-footer { margin-top: auto; padding: 14px 12px 16px; border-top: 1px solid var(--border); }

.main { grid-column: 2; min-width: 0; }
.topbar { position: sticky; top: 0; z-index: 30; height: var(--header-height); display: flex; align-items: center; justify-content: space-between; padding: 0 24px; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(18px); border-bottom: 1px solid var(--border); }
.topbar-title { display: grid; gap: 2px; }
.topbar-title strong { font-size: 15px; }
.topbar-title span { font-size: 11px; color: var(--text-muted); }
.main-content { width: min(1400px, 100%); margin: 0 auto; padding: 28px; }
.page-header { margin-bottom: 24px; display: flex; align-items: flex-start; justify-content: space-between; gap: 18px; }
.page-header h1 { font-size: clamp(24px, 3vw, 34px); letter-spacing: -.035em; }
.page-header p { margin-top: 8px; max-width: 760px; color: var(--text-muted); line-height: 1.6; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 16px; }

.auth-shell { min-height: 100vh; display: grid; place-items: center; padding: 24px; background: radial-gradient(circle at top right, var(--accent-soft), transparent 32%), var(--bg); }
.auth-card { width: min(460px, 100%); background: var(--surface); border: 1px solid var(--border); border-radius: 22px; padding: 28px; box-shadow: var(--shadow-lg); }
.auth-heading { display: grid; gap: 10px; margin-bottom: 24px; }
.auth-heading h1 { font-size: 27px; letter-spacing: -.035em; }
.auth-heading p { color: var(--text-muted); line-height: 1.55; }
.auth-brand { margin-bottom: 22px; display: flex; align-items: center; gap: 11px; }

.mobile-toggle { display: none; }
.sidebar-backdrop { display: none; }

@media (max-width: 980px) {
  .grid-4 { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .grid-3 { grid-template-columns: repeat(2, minmax(0,1fr)); }
}

@media (max-width: 760px) {
  .shell { display: block; }
  .main { grid-column: auto; }
  .sidebar { transform: translateX(-100%); transition: transform var(--transition); box-shadow: var(--shadow-lg); }
  .sidebar.open { transform: translateX(0); }
  .sidebar-backdrop { position: fixed; inset: 0; z-index: 35; background: var(--overlay); }
  .sidebar-backdrop.visible { display: block; }
  .mobile-toggle { display: inline-grid; }
  .topbar { padding: 0 16px; }
  .main-content { padding: 22px 16px; }
  .grid-2,.grid-3,.grid-4 { grid-template-columns: 1fr; }
  .page-header { display: grid; }
}