:root {
  --bg: #ffffff;
  --bg-subtle: #f6f6f7;
  --bg-hover: #f0f0f2;
  --bg-group: #eaeaec;
  --border: #dcdcde;
  --border-light: #ececee;
  --text: #1a1a1a;
  --text-secondary: #7a7a82;
  --text-muted: #a0a0a8;
  --accent: #1a1a1a;
  --accent-soft: #4a4a52;
  --highlight: #2a2a2a;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --mono: "SF Mono", "Fira Code", "Cascadia Code", monospace;
  --radius: 10px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.06);
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--font);
  background: var(--bg-subtle);
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 28px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 20;
}

.logo {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text);
}

.logo span {
  font-weight: 400;
  color: var(--text-secondary);
}

nav { display: flex; gap: 2px; }

nav button {
  font-family: var(--font);
  font-size: 13px;
  padding: 7px 16px;
  border: none;
  background: none;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: 6px;
  transition: all var(--transition);
  font-weight: 500;
}

nav button:hover { color: var(--text); background: var(--bg-subtle); }
nav button.active {
  color: var(--bg);
  background: var(--text);
  font-weight: 600;
}

.filters {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 28px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.filters label {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.filters input,
.filters select {
  font-family: var(--font);
  font-size: 13px;
  padding: 7px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  outline: none;
  transition: border-color var(--transition);
}

.filters input:focus,
.filters select:focus { border-color: var(--accent); }

.filter-group {
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn {
  font-family: var(--font);
  font-size: 13px;
  padding: 7px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
  font-weight: 500;
  transition: all var(--transition);
}

.btn:hover { background: var(--bg-subtle); border-color: var(--accent-soft); }
.btn-primary { background: var(--text); color: var(--bg); border-color: var(--text); }
.btn-primary:hover { opacity: 0.85; }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.summary {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  padding: 20px 28px;
}

.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 22px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition);
}

.card:hover { box-shadow: var(--shadow-md); }

.card-label {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

.card-value {
  font-size: 30px;
  font-weight: 800;
  color: var(--accent);
  margin-top: 4px;
  font-variant-numeric: tabular-nums;
  letter-spacing: -1px;
}

.table-container {
  margin: 0 28px 28px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.table-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border-light);
  background: var(--bg);
}

.table-toolbar .view-toggle {
  display: flex;
  gap: 4px;
}

.table-toolbar .view-toggle button {
  font-family: var(--font);
  font-size: 12px;
  padding: 4px 12px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: 6px;
  font-weight: 500;
  transition: all var(--transition);
}

.table-toolbar .view-toggle button:hover { background: var(--bg-subtle); }
.table-toolbar .view-toggle button.active {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}

.table-toolbar .row-info {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}

.table-wrap {
  overflow-x: auto;
  overflow-y: auto;
  max-height: calc(100vh - 290px);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  table-layout: fixed;
}

thead { position: sticky; top: 0; z-index: 5; }

th {
  text-align: left;
  padding: 9px 14px;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  cursor: pointer;
  white-space: nowrap;
  user-select: none;
  position: relative;
  transition: color var(--transition);
  overflow: hidden;
  text-overflow: ellipsis;
}

th:hover { color: var(--text); }
th.sorted { color: var(--text); }
th .arrow { font-size: 9px; margin-left: 3px; opacity: 0.6; }

/* Resize handle */
th .resize-handle {
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 6px;
  cursor: col-resize;
  background: transparent;
  transition: background var(--transition);
  z-index: 2;
}

th .resize-handle:hover,
th .resize-handle.active {
  background: var(--accent);
  opacity: 0.2;
}

td {
  padding: 7px 14px;
  border-bottom: 1px solid var(--border-light);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

tr:hover td { background: var(--bg-hover); }

tr.group-row {
  cursor: pointer;
  transition: background var(--transition);
}

tr.group-row td {
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  padding: 10px 14px;
}

tr.group-row:hover td { background: var(--bg-group); }

tr.group-row .group-chevron {
  display: inline-block;
  width: 18px;
  height: 18px;
  line-height: 18px;
  text-align: center;
  font-size: 11px;
  border-radius: 4px;
  background: var(--bg);
  border: 1px solid var(--border);
  margin-right: 8px;
  transition: transform var(--transition), background var(--transition);
  vertical-align: middle;
}

tr.group-row.expanded .group-chevron {
  transform: rotate(90deg);
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}

tr.group-row .group-source {
  font-weight: 700;
  color: var(--text);
  font-size: 13px;
}

tr.group-row .group-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  margin-left: 8px;
  font-variant-numeric: tabular-nums;
}

tr.child-row td {
  padding-left: 42px;
  font-size: 12.5px;
  color: var(--text);
}

tr.child-row td:first-child {
  padding-left: 42px;
}

tr.child-row.hidden { display: none; }
tr.child-row.visible {
  display: table-row;
  animation: fadeSlide 0.15s ease-out;
}

@keyframes fadeSlide {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

.num { text-align: right; font-variant-numeric: tabular-nums; font-family: var(--mono); font-size: 12px; }
.highlight { font-weight: 700; color: var(--accent); }

.empty {
  text-align: center;
  padding: 60px 24px;
  color: var(--text-muted);
  font-size: 14px;
}

.loading {
  text-align: center;
  padding: 50px;
  color: var(--text-muted);
  font-size: 13px;
}

.loading .spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-top-color: var(--text);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  margin-bottom: 8px;
}

@keyframes spin { to { transform: rotate(360deg); } }

.status-bar {
  padding: 8px 28px;
  font-size: 11px;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
}

@media (max-width: 768px) {
  .summary { grid-template-columns: repeat(2, 1fr); }
  header { flex-direction: column; gap: 12px; }
  .filters { gap: 8px; }
  .card-value { font-size: 22px; }
  .table-container { margin: 0 12px 12px; }
  .filters, header { padding-left: 16px; padding-right: 16px; }
  .summary { padding: 16px; }
}