/* App frame: sidebar + workspace grid. */
.app-root {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  height: 100vh;
  overflow: hidden;
}

.sidebar {
  background: var(--bg-elevated);
  border-right: 1px solid var(--stroke-hairline);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  padding: var(--space-4) var(--space-3);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3) var(--space-5);
}

.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: linear-gradient(140deg, var(--accent-strong), #8a6612);
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 13px;
  color: var(--text-inverse);
  box-shadow: var(--shadow-soft);
}

.brand-name { font-weight: 600; letter-spacing: -0.02em; }
.brand-sub { font-size: var(--fs-micro); color: var(--text-tertiary); }

.nav-group-label {
  font-size: var(--fs-micro);
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--text-tertiary);
  padding: var(--space-4) var(--space-3) var(--space-2);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  padding: 7px var(--space-3);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  transition: background 140ms var(--ease-out), color 140ms var(--ease-out);
  text-align: left;
}

.nav-item:hover { background: var(--bg-hover); color: var(--text-primary); }

.nav-item.is-active {
  background: var(--accent-muted);
  color: var(--accent-strong);
  font-weight: 550;
}

.nav-glyph { width: 18px; text-align: center; opacity: 0.9; }

.workspace {
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow: hidden;
}

.topbar {
  height: var(--topbar-h);
  flex: 0 0 var(--topbar-h);
  border-bottom: 1px solid var(--stroke-hairline);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-6);
  background: rgba(20, 23, 28, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
}

.topbar-title { font-size: var(--fs-lead); font-weight: 600; }
.topbar-crumb { font-size: var(--fs-micro); color: var(--text-tertiary); }
.topbar-actions { display: flex; align-items: center; gap: var(--space-3); }

.view-host {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: var(--space-6);
}

.view-header { margin-bottom: var(--space-5); }
.view-header p { max-width: 70ch; }

.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-4); }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-4); }
.grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--space-4); }
.stack { display: flex; flex-direction: column; gap: var(--space-4); }
.row { display: flex; align-items: center; gap: var(--space-3); }
.row-between { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); }

@media (max-width: 1080px) {
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}