:root {
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.25rem;
  --text-xl: 1.75rem;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-full: 9999px;
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
}
:root,
[data-theme='light'] {
  --color-bg: #f7f6f2;
  --color-surface: #fbfaf7;
  --color-surface-2: #ffffff;
  --color-offset: #f1eee9;
  --color-border: #e2ddd4;
  --color-divider: #e9e5dd;
  --color-text: #221f18;
  --color-text-muted: #6f6d66;
  --color-text-faint: #a9a6a0;
  --color-primary: #01696f;
  --color-primary-soft: rgba(1,105,111,0.10);
  --color-success: #437a22;
  --color-warning: #964219;
  --shadow: 0 1px 2px rgba(20,18,12,0.06), 0 4px 16px rgba(20,18,12,0.05);
}
[data-theme='dark'] {
  --color-bg: #14130f;
  --color-surface: #1c1a16;
  --color-surface-2: #221f1a;
  --color-offset: #1a1814;
  --color-border: #34302a;
  --color-divider: #2a2722;
  --color-text: #d8d4ca;
  --color-text-muted: #8a857c;
  --color-text-faint: #5c5850;
  --color-primary: #4f98a3;
  --color-primary-soft: rgba(79,152,163,0.14);
  --color-success: #6daa45;
  --color-warning: #bb653b;
  --shadow: 0 1px 2px rgba(0,0,0,0.3), 0 8px 28px rgba(0,0,0,0.35);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
body {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: clamp(0.875rem, 0.83rem + 0.2vw, 1rem);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.5;
  font-variant-numeric: tabular-nums lining-nums;
}
h1, h2 { line-height: 1.2; text-wrap: balance; }

/* topbar */
.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--space-5) clamp(var(--space-5), 5vw, var(--space-10));
  background: color-mix(in oklab, var(--color-bg) 82%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-divider);
}
.brand { display: flex; align-items: center; gap: var(--space-3); }
.logo { width: 34px; height: 34px; color: var(--color-primary); flex: none; }
.topbar h1 { font-size: var(--text-lg); font-weight: 700; letter-spacing: -0.01em; }
.sub { font-size: var(--text-xs); color: var(--color-text-muted); }
.theme-toggle {
  display: grid; place-items: center;
  width: 38px; height: 38px; border-radius: var(--radius-full);
  border: 1px solid var(--color-border); background: var(--color-surface);
  color: var(--color-text-muted); transition: var(--transition-interactive);
}
.theme-toggle:hover { color: var(--color-text); border-color: var(--color-primary); }

main {
  max-width: 1180px; margin: 0 auto;
  padding: clamp(var(--space-6), 4vw, var(--space-10)) clamp(var(--space-5), 5vw, var(--space-10)) var(--space-16);
  display: flex; flex-direction: column; gap: var(--space-8);
}

/* KPI grid */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-4);
}
.kpi {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: var(--space-1);
}
.kpi-label { font-size: var(--text-xs); color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.06em; font-weight: 600; }
.kpi-value { font-size: var(--text-xl); font-weight: 800; letter-spacing: -0.02em; font-family: 'JetBrains Mono', monospace; }
.kpi-value small { font-size: 0.5em; font-weight: 500; color: var(--color-text-muted); margin-left: 0.25em; font-family: 'Inter', sans-serif; }

/* panels */
.panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow);
}
.panel-head { margin-bottom: var(--space-5); }
.panel-head h2 { font-size: var(--text-base); font-weight: 700; }
.muted { color: var(--color-text-muted); font-size: var(--text-xs); margin-top: var(--space-1); }

.chart-frame { position: relative; width: 100%; height: 300px; }
.chart-grid {
  display: grid; gap: var(--space-5);
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}
.chart-cell { position: relative; width: 100%; height: 200px; }
.chart-cell-title { font-size: var(--text-sm); font-weight: 600; margin-bottom: var(--space-2); color: var(--color-text); }
.chart-cell-title .delta { float: right; font-size: var(--text-xs); font-weight: 600; color: var(--color-success); font-family: 'JetBrains Mono', monospace; }

/* heatmap */
.heatmap {
  display: grid;
  grid-template-columns: repeat(17, 1fr);
  gap: 4px;
}
.heat-cell {
  aspect-ratio: 1 / 1;
  border-radius: 4px;
  background: var(--color-offset);
  border: 1px solid transparent;
  min-height: 14px;
}
.heat-cell.l1 { background: color-mix(in oklab, var(--color-primary) 35%, var(--color-offset)); }
.heat-cell.l2 { background: color-mix(in oklab, var(--color-primary) 60%, var(--color-offset)); }
.heat-cell.l3 { background: color-mix(in oklab, var(--color-primary) 82%, var(--color-offset)); }
.heat-cell.l4 { background: var(--color-primary); }
.heat-legend { display: flex; align-items: center; gap: var(--space-2); margin-top: var(--space-4); font-size: var(--text-xs); color: var(--color-text-muted); }
.heat-legend .swatches { display: flex; gap: 3px; }
.heat-legend .swatches .heat-cell { width: 14px; height: 14px; min-height: 0; aspect-ratio: auto; }

/* empty state */
.empty-state {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; gap: var(--space-2); padding: var(--space-12) var(--space-6);
  color: var(--color-text-muted);
}
.empty-state svg { color: var(--color-text-faint); }
.empty-title { font-weight: 600; color: var(--color-text); font-size: var(--text-base); }
.empty-sub { font-size: var(--text-sm); max-width: 42ch; }
.hidden { display: none; }

.foot { text-align: center; padding: var(--space-4) 0; font-size: var(--text-xs); }

@media (max-width: 640px) {
  .chart-frame { height: 240px; }
  .heatmap { grid-template-columns: repeat(15, 1fr); }
  .heat-cell { border-radius: 3px; }
}