:root {
  --bg: #f4f6fb;
  --surface: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e8ecf3;
  --accent: #3d6cf6;
  --accent-soft: #e8edfe;
  --radius: 16px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.04), 0 8px 24px rgba(16, 24, 40, 0.06);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.app {
  max-width: 1180px;
  margin: 0 auto;
  padding: 32px 24px 80px;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
}

.app-header .brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.app-header .brand-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, #ff6b6b, #ff8e8e);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
}

.app-header h1 {
  font-size: 20px;
  margin: 0;
}

.app-header p {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.btn {
  border: none;
  border-radius: 10px;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.05s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--accent);
  color: white;
  box-shadow: 0 4px 14px rgba(61, 108, 246, 0.35);
}

.btn-primary:hover { background: #3159d6; }

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover { background: #f1f3f8; }

.btn-danger {
  background: #fdeeee;
  color: #c0392b;
}

.setup-banner {
  background: #fff8e6;
  border: 1px solid #f2d98d;
  border-radius: var(--radius);
  padding: 18px 20px;
  margin-bottom: 24px;
  font-size: 14px;
  line-height: 1.6;
}

.setup-banner code {
  background: #fceec9;
  padding: 1px 6px;
  border-radius: 6px;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 20px;
}

.card {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 20px;
}

.stat-card .stat-label {
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}

.stat-card .stat-value {
  font-size: 26px;
  font-weight: 700;
}

.stat-card .stat-sub {
  font-size: 12px;
  color: var(--muted);
  margin-top: 4px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  color: white;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
  align-items: stretch;
}

.card h2 {
  font-size: 15px;
  margin: 0 0 14px;
}

.chart-wrap {
  height: 260px;
  position: relative;
}

.heatmap-wrap {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.heatmap-dow {
  display: flex;
  flex-direction: column;
  gap: 3px;
  font-size: 10px;
  color: var(--muted);
  padding-top: 2px;
}

.heatmap-dow span {
  height: 13px;
  display: flex;
  align-items: center;
}

.heatmap-grid {
  display: flex;
  gap: 3px;
}

.heatmap-col {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.heatmap-cell {
  width: 13px;
  height: 13px;
  border-radius: 3px;
  background: #eef1f6;
  cursor: default;
}

.heatmap-cell.has-data {
  cursor: pointer;
}

.heatmap-cell.is-empty-future {
  background: transparent;
}

.heatmap-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
  font-size: 11px;
  color: var(--muted);
}

.heatmap-legend .legend-item {
  display: flex;
  align-items: center;
  gap: 5px;
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  display: inline-block;
}

.insights-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.insight {
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 13.5px;
  line-height: 1.5;
  border-left: 3px solid transparent;
}

.insight-info { background: #eef2ff; border-color: #6366f1; }
.insight-positive { background: #ecfdf3; border-color: #12b76a; }
.insight-warning { background: #fffaeb; border-color: #f79009; }
.insight-danger { background: #fef3f2; border-color: #d92d20; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}

thead th {
  text-align: left;
  color: var(--muted);
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
}

tbody td {
  padding: 10px;
  border-bottom: 1px solid var(--border);
}

tbody tr:hover { background: #fafbfe; }

.row-actions {
  display: flex;
  gap: 6px;
}

.icon-btn {
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 13px;
}

.icon-btn:hover { background: #f1f3f8; }

.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--muted);
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  padding: 20px;
}

.modal-overlay[hidden] { display: none; }

.modal {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 24px;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.25);
}

.modal h2 { margin-top: 0; }

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.form-grid .full { grid-column: 1 / -1; }

label {
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  display: block;
  margin-bottom: 4px;
}

input[type="number"],
input[type="text"],
input[type="datetime-local"] {
  width: 100%;
  padding: 9px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  font-size: 14px;
  font-family: inherit;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 4px;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 18px;
}

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: #1f2937;
  color: white;
  padding: 12px 18px;
  border-radius: 10px;
  font-size: 13px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
  z-index: 100;
}

.toast[hidden] { display: none; }

@media (max-width: 860px) {
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .grid-2 { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
}