:root {
  --bg: #0f1420;
  --bg-2: #161d2e;
  --card: #1b2338;
  --card-2: #212b45;
  --border: #2b3554;
  --text: #e6ebf5;
  --muted: #8b96b5;
  --accent: #5b8cff;
  --accent-2: #7c5bff;
  --good: #34d399;
  --warn: #fbbf24;
  --bad: #f87171;
}

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

body {
  font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.app { display: flex; min-height: 100vh; }

/* Sidebar */
.sidebar {
  width: 280px;
  flex-shrink: 0;
  background: var(--bg-2);
  border-right: 1px solid var(--border);
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  overflow-y: auto;
  max-height: 100vh;
  position: sticky;
  top: 0;
}
.brand { display: flex; gap: 12px; align-items: center; }
.brand-icon {
  width: 44px; height: 44px;
  display: grid; place-items: center;
  font-size: 22px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}
.brand h1 { font-size: 20px; }
.brand p { color: var(--muted); font-size: 12px; }

.dataset-group { margin-bottom: 14px; }
.dataset-group h4 {
  text-transform: uppercase;
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--muted);
  margin-bottom: 8px;
}
.dataset-item {
  padding: 10px 12px;
  border-radius: 10px;
  cursor: pointer;
  border: 1px solid transparent;
  margin-bottom: 6px;
  transition: background .15s;
}
.dataset-item:hover { background: var(--card-2); }
.dataset-item.active { background: var(--card-2); border-color: var(--accent); }
.dataset-item .d-title { font-size: 14px; font-weight: 600; }
.dataset-item .d-meta { font-size: 11px; color: var(--muted); margin-top: 2px; }
.dataset-item .d-del {
  float: right;
  background: none; border: none; color: var(--muted);
  cursor: pointer; font-size: 14px; padding: 0 2px; line-height: 1;
}
.dataset-item .d-del:hover { color: var(--bad); }
.dataset-item .d-badge { font-size: 9px; text-transform: uppercase; letter-spacing: .5px; color: var(--accent-2); margin-left: 6px; }

/* Main */
.main { flex: 1; padding: 22px 26px; max-width: 1400px; }
.topbar { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; margin-bottom: 18px; }
.topbar h2 { font-size: 22px; }
#dataset-subtitle, .hint { color: var(--muted); font-size: 12px; }
.topbar-actions { display: flex; align-items: center; gap: 10px; }
.load-state { font-size: 12px; color: var(--muted); }
.load-state.busy::before {
  content: "";
  display: inline-block;
  width: 12px; height: 12px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .8s linear infinite;
  margin-right: 6px;
}
@keyframes spin { to { transform: rotate(360deg); } }

.btn {
  background: var(--card-2);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 8px 14px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  transition: background .15s;
}
.btn:hover { background: #2a3557; }
.btn.primary { background: var(--accent); border-color: var(--accent); }
.btn.primary:hover { background: #4a7bff; }
.btn:disabled { opacity: .45; cursor: not-allowed; }

.tabs { display: flex; gap: 6px; border-bottom: 1px solid var(--border); margin-bottom: 20px; }
.tab {
  background: transparent; color: var(--muted);
  border: none; border-bottom: 2px solid transparent;
  padding: 10px 16px; font-size: 14px; cursor: pointer;
}
.tab.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  margin-bottom: 18px;
}
.card h3 { font-size: 15px; margin-bottom: 14px; color: var(--text); }

.kpi-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; margin-bottom: 18px; }
.kpi {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
}
.kpi .k-label { font-size: 12px; color: var(--muted); }
.kpi .k-value { font-size: 26px; font-weight: 700; margin-top: 4px; }
.kpi .k-sub { font-size: 12px; color: var(--muted); margin-top: 2px; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 1000px) { .grid-2 { grid-template-columns: 1fr; } }

.scroll-box { max-height: 420px; overflow-y: auto; }
.chart-wrap { position: relative; height: 300px; }
.chart-wrap.tall { height: 460px; }
.chart-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 1000px) { .chart-grid { grid-template-columns: 1fr; } }
.chart-card { background: var(--card-2); border-radius: 10px; padding: 12px; }
.chart-card h5 { font-size: 13px; color: var(--muted); margin-bottom: 8px; font-weight: 500; }
.chart-card .chart-wrap { height: 260px; }

.controls { display: flex; flex-wrap: wrap; gap: 12px; align-items: flex-end; margin-bottom: 16px; }
.controls label { display: flex; flex-direction: column; gap: 5px; font-size: 12px; color: var(--muted); }
.controls select, .controls input {
  background: var(--card-2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 13px;
  min-width: 150px;
}
.controls input { width: 80px; }

.insight-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 14px; }
.insight {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 10px;
  padding: 14px 16px;
}
.insight .i-kind {
  font-size: 10px; text-transform: uppercase; letter-spacing: 1px;
  color: var(--accent); margin-bottom: 6px;
}
.insight .i-text { font-size: 14px; line-height: 1.5; }

table { width: 100%; border-collapse: collapse; font-size: 13px; }
thead th {
  text-align: left; padding: 10px 12px;
  color: var(--muted); font-weight: 600;
  border-bottom: 1px solid var(--border);
  cursor: pointer; white-space: nowrap;
  position: sticky; top: 0; background: var(--card);
}
thead th:hover { color: var(--accent); }
tbody td { padding: 8px 12px; border-bottom: 1px solid var(--border-2, #232d4a); white-space: nowrap; }
tbody tr:hover { background: var(--card-2); }
.table-wrap { max-height: 480px; overflow: auto; border: 1px solid var(--border); border-radius: 10px; }

.data-toolbar { display: flex; gap: 12px; align-items: center; margin-bottom: 12px; }
.data-toolbar input {
  flex: 1; max-width: 360px;
  background: var(--card-2); border: 1px solid var(--border);
  color: var(--text); padding: 8px 12px; border-radius: 8px;
}
.pagination { display: flex; align-items: center; gap: 14px; margin-top: 14px; justify-content: flex-end; }
#page-info { font-size: 13px; color: var(--muted); }

.heatmap-wrap { height: auto; }
.corr-scale { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--muted); }
.corr-scale .bar {
  width: 120px; height: 10px; border-radius: 6px;
  background: linear-gradient(90deg, #f87171, #fbbf24, #34d399, #2563eb);
}

/* Column profile table */
.profile-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.profile-table th, .profile-table td { padding: 8px 10px; text-align: left; border-bottom: 1px solid var(--border); white-space: nowrap; }
.profile-table th { color: var(--muted); font-size: 11px; text-transform: uppercase; position: sticky; top: 0; background: var(--card); }
.badge { padding: 2px 8px; border-radius: 20px; font-size: 11px; }
.badge.num { background: #1d3a5f; color: #7cc4ff; }
.badge.cat { background: #3a2f14; color: #fbd66b; }
.badge.dt { background: #143d31; color: #6ef0c1; }
.badge.txt { background: #3b2b40; color: #e59cff; }

.toast {
  position: fixed; bottom: 24px; right: 24px;
  background: var(--bad); color: #fff;
  padding: 12px 18px; border-radius: 10px;
  font-size: 14px; opacity: 0; pointer-events: none;
  transition: opacity .2s; z-index: 100;
}
.toast.show { opacity: 1; }

::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 6px; }
::-webkit-scrollbar-track { background: transparent; }