:root {
  --bg: #0f1419;
  --surface: #161c23;
  --surface-2: #1d242d;
  --border: #242d38;
  --text: #e4e9ef;
  --text-dim: #8a95a3;
  --text-faint: #5b6573;
  --accent: #4aa4ff;
  --accent-dim: #2d6baa;
  --success: #4ade80;
  --warn: #f59e0b;
  --danger: #ef4444;
  --purple: #a78bfa;
  --teal: #2dd4bf;
  --radius: 8px;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 4px 12px rgba(0,0,0,.25);
  --sidebar-w: 280px;
  --topbar-h: 60px;
}

/* Light theme tokens */
html[data-theme="light"] {
  --bg: #f0f3f7;
  --surface: #ffffff;
  --surface-2: #e8ecf2;
  --border: #d0d7e2;
  --text: #111827;
  --text-dim: #4b5563;
  --text-faint: #9ca3af;
  --accent: #2563eb;
  --accent-dim: #bfdbfe;
  --shadow: 0 1px 2px rgba(0,0,0,.05), 0 4px 12px rgba(0,0,0,.08);
}

@media (prefers-color-scheme: light) {
  html:not([data-theme="dark"]) {
    --bg: #f0f3f7;
    --surface: #ffffff;
    --surface-2: #e8ecf2;
    --border: #d0d7e2;
    --text: #111827;
    --text-dim: #4b5563;
    --text-faint: #9ca3af;
    --accent: #2563eb;
    --accent-dim: #bfdbfe;
    --shadow: 0 1px 2px rgba(0,0,0,.05), 0 4px 12px rgba(0,0,0,.08);
  }
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg); color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Inter", "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.45;
}

/* === TOPBAR === */
.topbar {
  position: fixed; top: 0; left: 0; right: 0; height: var(--topbar-h);
  display: flex; align-items: center; gap: 24px;
  padding: 0 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  z-index: 30;
}
.brand { display: flex; align-items: center; gap: 10px; min-width: var(--sidebar-w); }
.logo { width: 32px; height: 32px; display: grid; place-items: center;
  background: var(--surface-2); border-radius: 6px; color: var(--accent); }
.brand-title { font-weight: 600; letter-spacing: .2px; }
.brand-sub { font-size: 12px; color: var(--text-dim); }

.tabs { display: flex; gap: 4px; flex: 1; }
.tab {
  background: transparent; color: var(--text-dim);
  border: 0; padding: 8px 14px; font-size: 13px; font-weight: 500;
  border-radius: 6px; cursor: pointer;
}
.tab:hover { color: var(--text); background: var(--surface-2); }
.tab.active { color: var(--text); background: var(--surface-2); box-shadow: inset 0 -2px 0 var(--accent); }

.snapshot-pill {
  padding: 6px 12px; background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 999px; font-size: 12px; color: var(--text-dim); white-space: nowrap;
}

.theme-toggle {
  display: flex; background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 999px; padding: 3px; gap: 2px; flex-shrink: 0;
}
.theme-toggle button {
  display: flex; align-items: center; gap: 5px;
  padding: 4px 10px; border: none; background: transparent;
  border-radius: 999px; cursor: pointer; font-size: 12px; font-weight: 500;
  color: var(--text-faint); font-family: inherit; white-space: nowrap;
  transition: color .15s;
}
.theme-toggle button:hover { color: var(--text-dim); }
.theme-toggle button.active {
  background: var(--surface); color: var(--text);
  box-shadow: 0 1px 3px rgba(0,0,0,.2);
}

/* === SIDEBAR === */
.sidebar {
  position: fixed; top: var(--topbar-h); left: 0; bottom: 0; width: var(--sidebar-w);
  padding: 20px; overflow-y: auto;
  background: var(--surface); border-right: 1px solid var(--border);
}
.sb-section { margin-bottom: 18px; }
.sb-label {
  display: block; font-size: 11px; text-transform: uppercase; letter-spacing: .7px;
  color: var(--text-faint); margin-bottom: 6px; font-weight: 600;
}
.sb-hint { font-size: 11px; color: var(--text-faint); margin-top: 4px; }

select, input[type="number"], input[type="date"], input[type="file"] {
  width: 100%;
  background: var(--surface-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 6px;
  padding: 7px 9px; font-size: 13px; font-family: inherit;
  outline: none;
}
select:focus, input:focus { border-color: var(--accent); }
select[multiple] { padding: 4px; }
select[multiple] option {
  padding: 4px 6px; border-radius: 4px;
}
select[multiple] option:checked { background: var(--accent-dim); color: var(--text); }

.sb-actions { display: flex; gap: 8px; margin-top: 6px; }
.btn-primary, .btn-ghost {
  padding: 8px 14px; border-radius: 6px; font-size: 13px; font-weight: 500;
  cursor: pointer; border: 1px solid transparent; font-family: inherit;
}
.btn-primary { background: var(--accent); color: #001427; border-color: var(--accent); }
.btn-primary:hover { filter: brightness(1.1); }
.btn-ghost { background: transparent; color: var(--text-dim); border-color: var(--border); }
.btn-ghost:hover { color: var(--text); background: var(--surface-2); }

/* === CONTENT === */
.content {
  margin-left: var(--sidebar-w);
  margin-top: var(--topbar-h);
  padding: 24px;
  min-height: calc(100vh - var(--topbar-h));
}
.tab-pane { display: none; }
.tab-pane.active { display: block; animation: fade .2s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

/* === KPI === */
.kpi-row {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px; margin-bottom: 20px;
}
.kpi {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px 18px;
}
.kpi-label { font-size: 11px; color: var(--text-faint); text-transform: uppercase; letter-spacing: .5px; font-weight: 600; }
.kpi-value { font-size: 26px; font-weight: 600; margin-top: 6px; font-variant-numeric: tabular-nums; }
.kpi-sub { font-size: 12px; color: var(--text-dim); margin-top: 4px; }
.kpi-sub.up { color: var(--success); }
.kpi-sub.down { color: var(--danger); }

/* === CARDS & GRID === */
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px; margin-bottom: 20px;
  box-shadow: var(--shadow);
}
.card h3 {
  margin: 0 0 14px; font-size: 14px; font-weight: 600;
  color: var(--text); letter-spacing: .2px;
}
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 20px; }
.grid-2 > .card { margin-bottom: 0; }
@media (max-width: 1100px) { .grid-2 { grid-template-columns: 1fr; } }

.chart-wrap { position: relative; height: 320px; }
.chart-wrap.small { height: 220px; }

.legend-list { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 12px; font-size: 12px; color: var(--text-dim); }
.legend-list .sw { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 6px; vertical-align: middle; }

.abc-legend { display: flex; gap: 20px; margin-top: 10px; font-size: 12px; color: var(--text-dim); }
.abc-legend b { color: var(--text); font-variant-numeric: tabular-nums; }

/* === TABLES === */
.table-wrap { overflow: auto; max-height: 560px; border-radius: 6px; border: 1px solid var(--border); }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
thead th {
  position: sticky; top: 0; background: var(--surface-2);
  text-align: left; font-weight: 600; font-size: 11px; letter-spacing: .4px;
  text-transform: uppercase; color: var(--text-dim);
  padding: 10px 12px; border-bottom: 1px solid var(--border);
}
tbody td { padding: 9px 12px; border-bottom: 1px solid var(--border); }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: rgba(74, 164, 255, .04); }
.num { text-align: right; font-variant-numeric: tabular-nums; }

.delta-pos { color: var(--success); font-weight: 600; }
.delta-neg { color: var(--danger); font-weight: 600; }

/* === HEATMAP === */
.heatmap { display: grid; gap: 2px; margin-top: 8px; }
.heatmap .hm-row { display: grid; grid-template-columns: 240px repeat(4, 1fr); gap: 2px; }
.heatmap .hm-header { font-size: 11px; color: var(--text-faint); text-transform: uppercase; letter-spacing: .4px; padding: 6px 8px; font-weight: 600; }
.heatmap .hm-label { padding: 8px 10px; font-size: 12px; color: var(--text); background: var(--surface-2); border-radius: 4px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.heatmap .hm-cell { padding: 10px; border-radius: 4px; font-size: 12px; font-variant-numeric: tabular-nums; color: #fff; min-height: 44px; display: flex; flex-direction: column; justify-content: center; gap: 2px; }
.heatmap .hm-cell .v { font-weight: 600; }
.heatmap .hm-cell .c { font-size: 11px; opacity: .85; }

/* === UPLOAD === */
.upload-form { display: flex; gap: 16px; align-items: end; flex-wrap: wrap; }
.upload-form .field { display: flex; flex-direction: column; gap: 6px; min-width: 220px; }
.upload-form label { font-size: 12px; color: var(--text-dim); }
.upload-result { margin-top: 14px; padding: 12px; border-radius: 6px; font-size: 13px; }
.upload-result.ok { background: rgba(74, 222, 128, .1); border: 1px solid rgba(74, 222, 128, .3); color: var(--success); }
.upload-result.err { background: rgba(239, 68, 68, .1); border: 1px solid rgba(239, 68, 68, .3); color: var(--danger); }

/* === MISC === */
.muted { color: var(--text-dim); }
.hidden { display: none !important; }
.info-banner {
  padding: 12px 14px; background: rgba(74, 164, 255, .08);
  border: 1px solid rgba(74, 164, 255, .3); border-radius: 6px;
  color: var(--text); margin-bottom: 16px; font-size: 13px;
}

.inline-controls { display: flex; gap: 18px; margin-bottom: 12px; font-size: 13px; color: var(--text-dim); }
.inline-controls select { display: inline-block; width: auto; margin-left: 6px; }

.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  padding: 10px 18px; background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 999px; font-size: 13px; box-shadow: var(--shadow);
  opacity: 0; pointer-events: none; transition: opacity .2s;
  z-index: 100;
}
.toast.show { opacity: 1; }

/* Loading skeleton */
.loading { opacity: .5; pointer-events: none; }