*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --sidebar-w: 220px;
  --sidebar-bg: #1e293b;
  --sidebar-text: #94a3b8;
  --sidebar-active: #f1f5f9;
  --sidebar-hover: #334155;
  --topbar-h: 56px;
  --bg: #f8fafc;
  --bg-card: #ffffff;
  --border: #e2e8f0;
  --text: #0f172a;
  --text-muted: #64748b;
  --accent: #3b82f6;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Mono', monospace;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,.1);
}

html, body { height: 100%; font-family: var(--font); color: var(--text); background: var(--bg); font-size: 14px; }

/* -- Layout -- */
.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
}

/* -- Sidebar -- */
.sidebar {
  background: var(--sidebar-bg);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: var(--sidebar-w);
  z-index: 100;
  transition: transform .2s;
}

.sidebar__brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px 20px 16px;
  font-size: 1rem;
  font-weight: 700;
  color: #f1f5f9;
  border-bottom: 1px solid #334155;
  letter-spacing: -.01em;
}

.sidebar__nav {
  padding: 12px 8px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: 6px;
  color: var(--sidebar-text);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: background .15s, color .15s;
}

.nav-item:hover { background: var(--sidebar-hover); color: var(--sidebar-active); }
.nav-item--active { background: var(--sidebar-hover); color: var(--sidebar-active); }
.nav-item--active svg { opacity: 1; }
.nav-item svg { opacity: .6; flex-shrink: 0; }

/* -- Content area -- */
.content {
  margin-left: var(--sidebar-w);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* -- Topbar -- */
.topbar {
  height: var(--topbar-h);
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 50;
}

.topbar__menu {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
}

.topbar__title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

/* -- Main content -- */
.main {
  padding: 24px;
  flex: 1;
}

/* -- Stats grid -- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}

.stat-card__value {
  font-size: 2rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text);
  line-height: 1;
  margin-bottom: 6px;
}

.stat-card__label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .05em;
}

/* -- Section -- */
.section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 24px;
  overflow: hidden;
}

.section__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}

.section__title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
}

.section__count {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* -- Filters -- */
.filters {
  display: flex;
  gap: 10px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  background: var(--bg);
}

.filter-select {
  height: 34px;
  padding: 0 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-card);
  color: var(--text);
  font-size: 0.8rem;
  cursor: pointer;
}

/* -- Table -- */
.table-wrap { overflow-x: auto; }

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}

.data-table th {
  text-align: left;
  padding: 10px 20px;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .06em;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.data-table td {
  padding: 11px 20px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
  vertical-align: middle;
}

.data-table tr:last-child td { border-bottom: none; }
.data-table tbody tr:hover { background: #f8fafc; }

/* -- Badges -- */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 99px;
  font-size: 0.7rem;
  font-weight: 600;
  white-space: nowrap;
}

.badge--green  { background: #dcfce7; color: #16a34a; }
.badge--gray   { background: #f1f5f9; color: #475569; }
.badge--red    { background: #fee2e2; color: #dc2626; }
.badge--blue   { background: #dbeafe; color: #1d4ed8; }

/* -- Avatar chips -- */
.avatars { display: flex; gap: 4px; flex-wrap: wrap; }

.avatar {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: #e2e8f0;
  color: #475569;
  font-size: 0.7rem;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: default;
}

/* -- Group cards (overview) -- */
.group-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  padding: 20px;
}

.group-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}

.group-card__name {
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.group-card__stats {
  display: flex;
  gap: 16px;
  margin-bottom: 12px;
}

.group-card__stat { font-size: 0.78rem; color: var(--text-muted); }
.group-card__stat strong { color: var(--text); font-family: var(--font-mono); }

/* -- Monospace values -- */
.mono { font-family: var(--font-mono); }
.muted { color: var(--text-muted); }

/* -- Loading / Empty -- */
.loading, .empty {
  padding: 48px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* -- Mobile overlay -- */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  z-index: 99;
}

/* -- Mobile -- */
@media (max-width: 768px) {
  .layout { grid-template-columns: 1fr; }
  .content { margin-left: 0; }

  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar--open {
    transform: translateX(0);
  }
  .sidebar-overlay--open {
    display: block;
  }

  .topbar__menu { display: flex; }

  .main { padding: 16px; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .stat-card { padding: 14px; }
  .stat-card__value { font-size: 1.5rem; }

  .data-table th, .data-table td { padding: 9px 12px; }

  .group-cards { grid-template-columns: 1fr; padding: 16px; }
}