:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --surface-alt: #eef1f5;
  --border: #dbe0e6;
  --text: #1a1d21;
  --text-muted: #5b6570;
  --accent: #2a6fdb;
  --accent-contrast: #ffffff;
  --danger: #c0392b;
  --success: #1e8e5a;
  --shadow: 0 1px 3px rgba(20, 24, 30, 0.08);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --surface: #1c1f24;
    --surface-alt: #23262c;
    --border: #33373f;
    --text: #e8eaed;
    --text-muted: #9aa2ad;
    --accent: #6ea8ff;
    --accent-contrast: #0b1220;
    --danger: #ff8a7a;
    --success: #6bd6a5;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

.topbar {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  padding: 12px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 20;
}

.topbar h1 {
  font-size: 1.1rem;
  margin: 0;
  white-space: nowrap;
}

.tabs {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.tab-btn {
  border: 1px solid var(--border);
  background: var(--surface-alt);
  color: var(--text);
  padding: 6px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
}

.tab-btn.active {
  background: var(--accent);
  color: var(--accent-contrast);
  border-color: var(--accent);
}

.meta-info {
  margin-left: auto;
  font-size: 0.8rem;
  color: var(--text-muted);
}

#app {
  padding: 16px 20px 40px;
  max-width: 1400px;
  margin: 0 auto;
}

.view.hidden, .hidden {
  display: none !important;
}

.empty-state {
  max-width: 560px;
  margin: 60px auto;
  text-align: center;
  color: var(--text-muted);
}

.empty-state h2 { color: var(--text); }

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
}

.controls-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: flex-end;
  margin-bottom: 12px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.field select, .field input {
  background: var(--surface-alt);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 6px;
  padding: 5px 8px;
  font-size: 0.9rem;
}

.field input[type="number"] { width: 90px; }

.field.checkbox {
  flex-direction: row;
  align-items: center;
  gap: 6px;
}

button.btn {
  border: 1px solid var(--border);
  background: var(--surface-alt);
  color: var(--text);
  padding: 5px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.82rem;
}

button.btn:hover { border-color: var(--accent); }

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--surface-alt);
  cursor: pointer;
  font-size: 0.76rem;
  user-select: none;
}

.legend-item.off {
  opacity: 0.35;
  text-decoration: line-through;
}

.legend-swatch {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.legend-actions {
  display: flex;
  gap: 8px;
  margin-bottom: 6px;
}

.chart-wrap {
  position: relative;
  width: 100%;
  overflow-x: auto;
}

svg.chart {
  width: 100%;
  height: auto;
  min-width: 640px;
}

.axis-label { fill: var(--text-muted); font-size: 11px; }
.axis-line { stroke: var(--border); stroke-width: 1; }
.grid-line { stroke: var(--border); stroke-width: 1; opacity: 0.5; }
.band-separator { stroke: var(--border); stroke-width: 1; stroke-dasharray: 4 3; }
.band-label { fill: var(--text-muted); font-size: 10px; font-style: italic; }

.point {
  cursor: pointer;
  stroke: var(--surface);
  stroke-width: 1;
  opacity: 0.9;
}

.point:hover { opacity: 1; stroke-width: 2; }

.tooltip {
  position: fixed;
  z-index: 100;
  max-width: 340px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 0.78rem;
  box-shadow: 0 4px 16px rgba(0,0,0,0.25);
  pointer-events: none;
}

.tooltip h4 {
  margin: 0 0 6px;
  font-size: 0.88rem;
}

.tooltip dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2px 8px;
  margin: 0;
}

.tooltip dt { color: var(--text-muted); }
.tooltip dd { margin: 0; }

table.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}

table.data-table th, table.data-table td {
  border-bottom: 1px solid var(--border);
  padding: 6px 8px;
  text-align: left;
  white-space: nowrap;
}

table.data-table th {
  cursor: pointer;
  color: var(--text-muted);
  position: sticky;
  top: 0;
  background: var(--surface);
  user-select: none;
}

table.data-table th.sorted::after { content: " " attr(data-dir); }

table.data-table td.wrap { white-space: normal; max-width: 260px; }

.table-scroll {
  max-height: 70vh;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.badge {
  display: inline-block;
  padding: 1px 7px;
  border-radius: 10px;
  font-size: 0.7rem;
  background: var(--surface-alt);
  border: 1px solid var(--border);
}

.badge.tipo-nuova { color: var(--success); border-color: var(--success); }
.badge.tipo-rimossa { color: var(--danger); border-color: var(--danger); }

.result-count {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.controls-row .result-count {
  margin: 0;
  flex: 1;
  min-width: 160px;
}