.app-shell {
  display: flex;
  height: 100vh;
  overflow: hidden;
  background: var(--bg-app);
}

/* ───── Sidebar ───── */
.sidebar {
  width: var(--sidebar-w-collapsed);
  flex-shrink: 0;
  background: var(--bg-surface);
  border-right: 0.5px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  transition: width var(--t-slow);
  overflow: hidden;
  z-index: 100;
}

@media (min-width: 768px) {
  .sidebar:hover { width: var(--sidebar-w-expanded); }
  .sidebar:hover .nav-label,
  .sidebar:hover .sidebar-logo-text,
  .sidebar:hover .nav-group-label,
  .sidebar:hover .nav-badge { opacity: 1; pointer-events: auto; }
}

.sidebar-header {
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 14px;
  border-bottom: 0.5px solid var(--border-subtle);
  flex-shrink: 0;
}

.logo-mark {
  width: 28px; height: 28px;
  border-radius: var(--radius-sm);
  background: var(--brand-dim);
  color: var(--brand-light);
  font-size: 11px; font-weight: 600;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; letter-spacing: -0.3px;
}

.sidebar-logo-text {
  font-size: 13px; font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap; opacity: 0;
  transition: opacity var(--t-base);
}

.sidebar-nav {
  flex: 1; overflow-y: auto; overflow-x: hidden;
  padding: 8px 4px; scrollbar-width: none;
}
.sidebar-nav::-webkit-scrollbar { display: none; }

.nav-group-label {
  font-size: 10px; font-weight: 500;
  letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--text-tertiary);
  padding: 12px 8px 4px;
  white-space: nowrap; opacity: 0;
  transition: opacity var(--t-base); display: block;
}

.nav-item {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 8px; border-radius: var(--radius-md);
  margin: 1px 0; color: var(--text-secondary);
  text-decoration: none; font-size: 13px;
  white-space: nowrap; position: relative;
  transition: background var(--t-fast), color var(--t-fast);
  cursor: pointer;
}
.nav-item:hover  { background: var(--bg-hover); color: var(--text-primary); }
.nav-item.active { background: var(--bg-active); color: var(--text-primary); font-weight: 500; }
.nav-item.active::before {
  content: ''; position: absolute;
  left: 0; top: 6px; bottom: 6px;
  width: 2.5px; border-radius: 0 2px 2px 0;
  background: var(--brand);
}

.nav-icon  { flex-shrink: 0; width: 16px; height: 16px; }
.nav-dot   { width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0; margin: 0 3px 0 4px; }
.nav-label { opacity: 0; transition: opacity var(--t-base); pointer-events: none; }
.nav-badge {
  margin-left: auto; font-size: 10px; font-weight: 500;
  padding: 1px 6px; border-radius: 10px;
  background: var(--warning-bg); color: var(--warning);
  opacity: 0; transition: opacity var(--t-base);
}

/* Tooltip collapsed */
.nav-item .tooltip {
  position: absolute;
  left: calc(var(--sidebar-w-collapsed) + 8px);
  background: var(--bg-elevated);
  border: 0.5px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: 4px 10px; font-size: 12px;
  color: var(--text-primary); white-space: nowrap;
  pointer-events: none; opacity: 0;
  transition: opacity var(--t-fast); z-index: 200;
}
.sidebar:not(:hover) .nav-item:hover .tooltip { opacity: 1; }

.sidebar-bottom {
  border-top: 0.5px solid var(--border-subtle);
  padding: 8px 4px; flex-shrink: 0;
}

/* ───── Main area ───── */
.main-area {
  flex: 1; display: flex; flex-direction: column;
  overflow: hidden; background: var(--bg-app);
}

.topbar {
  height: var(--topbar-h);
  border-bottom: 0.5px solid var(--border-subtle);
  display: flex; align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  background: var(--bg-surface); flex-shrink: 0;
}

.topbar-left { display: flex; align-items: center; gap: 12px; }
.topbar-title { font-size: 14px; font-weight: 500; color: var(--text-primary); }

.topbar-right { display: flex; align-items: center; gap: 8px; }

.main-content { flex: 1; overflow-y: auto; padding: 24px; }

/* ───── Trial banner ───── */
.trial-banner {
  display: flex; align-items: center; justify-content: center;
  gap: 12px; padding: 8px 16px;
  background: var(--brand-dim);
  color: var(--brand-light);
  font-size: 12px; font-weight: 500;
  flex-shrink: 0;
}
.trial-banner .btn { font-size: 11px; padding: 3px 10px; background: rgba(255,255,255,.15); border: none; color: #fff; }

/* ───── Mobile sidebar ───── */
@media (max-width: 767px) {
  .sidebar {
    position: fixed; left: 0; top: 0; bottom: 0;
    width: var(--sidebar-w-expanded);
    transform: translateX(-100%);
    transition: transform var(--t-slow);
    z-index: 1000;
  }
  .sidebar.open { transform: translateX(0); }
  .sidebar.open ~ .sidebar-overlay { display: block; }
  .sidebar .nav-label,
  .sidebar .sidebar-logo-text,
  .sidebar .nav-group-label,
  .sidebar .nav-badge { opacity: 1; pointer-events: auto; }

  .sidebar-overlay {
    display: none; position: fixed; inset: 0;
    background: rgba(0,0,0,.5); z-index: 999;
  }

  .mobile-menu-btn { display: flex !important; }
}

@media (min-width: 768px) {
  .mobile-menu-btn { display: none !important; }
  .sidebar-overlay { display: none !important; }
}

/* ───── Utilities ───── */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-4 { gap: 4px; } .gap-8 { gap: 8px; } .gap-12 { gap: 12px; } .gap-16 { gap: 16px; } .gap-24 { gap: 24px; }
.grid { display: grid; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 1024px) { .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; } }
.mt-8 { margin-top: 8px; } .mt-16 { margin-top: 16px; } .mt-24 { margin-top: 24px; }
.mb-8 { margin-bottom: 8px; } .mb-16 { margin-bottom: 16px; } .mb-24 { margin-bottom: 24px; }
.text-sm { font-size: 12px; } .text-xs { font-size: 11px; }
.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.w-full { width: 100%; }