:root {
  --accent: #2a78d6;
  --accent-dark: #184f95;
  --accent-soft: #cde2fb;
  --series-2: #1baf7a;
  --bg: #f9f9f7;
  --card: #fcfcfb;
  --text: #0b0b0b;
  --secondary: #52514e;
  --muted: #898781;
  --border: #e1e0d9;
  --delta-up: #d03b3b;
  --delta-down: #006300;
  --radius: 12px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
}

header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 18px 28px;
  position: sticky;
  top: 0;
  z-index: 10;
}
.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
h1 { font-size: 20px; margin: 0; }
.subtitle { margin: 4px 0 0; color: var(--secondary); font-size: 13px; }
.header-actions { display: flex; gap: 8px; }

main { max-width: 1200px; margin: 24px auto; padding: 0 28px 60px; }

.btn {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-dark); border-color: var(--accent-dark); color: #fff; }
.btn.danger { color: var(--delta-up); }
.btn.danger:hover { border-color: var(--delta-up); }

.dropzone {
  border: 2px dashed #c9cedb;
  border-radius: var(--radius);
  background: var(--card);
  padding: 70px 30px;
  text-align: center;
  color: var(--secondary);
  cursor: pointer;
  margin-top: 40px;
}
.dropzone:hover { border-color: var(--accent); }
.dz-icon { font-size: 42px; margin-bottom: 10px; }
.dropzone code { background: var(--accent-soft); padding: 1px 5px; border-radius: 4px; color: var(--accent-dark); }

#drop-overlay {
  position: fixed;
  inset: 0;
  background: rgba(42, 120, 214, 0.12);
  border: 4px dashed var(--accent);
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  font-weight: 600;
  color: var(--accent-dark);
  pointer-events: none;
}
#drop-overlay.active { display: flex; }

.filter-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 13px;
  cursor: pointer;
}
.chip:hover { border-color: var(--accent); }
.chip.active { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-bottom: 20px;
}
.card h2 { font-size: 15px; margin: 0 0 14px; }
.hint { font-weight: 400; color: var(--muted); font-size: 12px; }

.kpis {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}
.kpi { margin-bottom: 0; }
.kpi-label { font-size: 12px; color: var(--secondary); text-transform: uppercase; letter-spacing: 0.4px; }
.kpi-value { font-size: 26px; font-weight: 700; margin: 6px 0 2px; overflow-wrap: anywhere; }
.kpi-value .unit { font-size: 14px; font-weight: 600; color: var(--secondary); display: inline-block; }
.kpi-sub { font-size: 12px; color: var(--muted); }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 900px) { .grid-2 { grid-template-columns: 1fr; } }
.grid-2 .card { margin-bottom: 20px; }

.chart-wrap { position: relative; height: 280px; }
.chart-wrap.tall { height: 320px; }

#heatmap { overflow-x: auto; }
.hm-grid {
  display: grid;
  grid-template-columns: 46px repeat(24, minmax(24px, 1fr));
  gap: 3px;
  min-width: 720px;
}
.hm-cell { aspect-ratio: 1.4; border-radius: 4px; }
.hm-label { font-size: 11px; color: var(--secondary); display: flex; align-items: center; }
.hm-hour { font-size: 10px; color: var(--muted); text-align: center; align-self: end; }
.hm-legend { display: flex; align-items: center; gap: 8px; margin-top: 10px; font-size: 11px; color: var(--muted); }
.hm-legend-bar { width: 120px; height: 10px; border-radius: 5px; background: linear-gradient(to right, #eef1f5, var(--accent)); }

#files-table { width: 100%; border-collapse: collapse; font-size: 13px; }
#files-table th, #files-table td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
#files-table th { color: var(--secondary); font-weight: 500; font-size: 12px; }
.danger-row { margin-top: 14px; text-align: right; }

.insight { font-size: 13px; color: var(--secondary); margin: -6px 0 12px; }
.insight strong { color: var(--text); }

.data-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.data-table th, .data-table td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
.data-table th { color: var(--secondary); font-weight: 500; font-size: 12px; }
.data-table .num { font-variant-numeric: tabular-nums; }
.table-scroll { overflow-x: auto; }

.compare-controls { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; flex-wrap: wrap; }
.compare-controls select {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 13px;
  background: var(--card);
  color: var(--text);
}
.compare-controls .vs { font-size: 12px; color: var(--muted); }
.cmp-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 10px;
  margin-bottom: 14px;
}
.cmp-stat { background: var(--bg); border-radius: 8px; padding: 10px 12px; font-size: 12px; color: var(--secondary); }
.cmp-stat b { display: block; font-size: 16px; color: var(--text); margin-top: 2px; }
.cmp-stat .delta-up { color: var(--delta-up); }
.cmp-stat .delta-down { color: var(--delta-down); }

.btn.mini { padding: 4px 9px; font-size: 11px; }

#toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: #fff;
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 13px;
  z-index: 200;
  max-width: 90vw;
}
#toast.error { background: var(--delta-up); }

#files-table-wrap { overflow-x: auto; }

@media (max-width: 640px) {
  header { position: static; padding: 14px 16px; }
  main { padding: 0 14px 40px; margin-top: 16px; }
  .header-actions .btn { padding: 7px 10px; font-size: 12px; white-space: nowrap; }
  .chart-wrap, .chart-wrap.tall { height: 240px; }
  .kpi-value { font-size: 22px; }
  .card { padding: 14px; }
}