:root {
  --bg: #f5f7f9;
  --panel: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e2e8f0;
  --accent: #2563eb;
  --danger: #dc2626;
}

* { box-sizing: border-box; }

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

/* --- Login --- */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}
.login-box {
  background: var(--panel);
  padding: 2.5rem;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
  width: min(90vw, 340px);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.login-box h1 { font-size: 1.25rem; margin: 0 0 0.5rem; }
.login-box label { display: flex; flex-direction: column; gap: 0.35rem; font-size: 0.9rem; color: var(--muted); }
.login-box input {
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
}
.login-box button {
  margin-top: 0.5rem;
  padding: 0.7rem;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: white;
  font-size: 1rem;
  cursor: pointer;
}
.login-box .error { color: var(--danger); font-size: 0.9rem; margin: 0; }

/* --- Topbar --- */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}
.topbar h1 { font-size: 1.1rem; margin: 0; }
.topbar-actions { display: flex; align-items: center; gap: 1rem; font-size: 0.9rem; color: var(--muted); }
.topbar-actions a { color: var(--accent); text-decoration: none; }
.topbar-actions button {
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--border);
  background: white;
  border-radius: 6px;
  cursor: pointer;
}

.empty-state { padding: 3rem; text-align: center; color: var(--muted); }

/* --- Controls --- */
.controls, .metric-picker {
  display: flex;
  gap: 1.5rem;
  padding: 1rem 1.5rem;
  flex-wrap: wrap;
}
.control-group { display: flex; flex-direction: column; gap: 0.3rem; font-size: 0.85rem; color: var(--muted); }
.control-group select {
  padding: 0.4rem 0.6rem;
  border-radius: 6px;
  border: 1px solid var(--border);
}

.metric-picker { background: var(--panel); margin: 0 1.5rem; border-radius: 10px; border: 1px solid var(--border); }
.metric-group { display: flex; flex-direction: column; gap: 0.4rem; min-width: 200px; }
.metric-group h3 { margin: 0 0 0.2rem; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.03em; color: var(--muted); }
.metric-checkbox { display: flex; align-items: center; gap: 0.5rem; font-size: 0.92rem; }
.muted { color: var(--muted); font-size: 0.8rem; }

.more-metrics { margin-top: 0.2rem; }
.more-metrics summary { cursor: pointer; font-size: 0.8rem; color: var(--accent); list-style: none; }
.more-metrics summary::-webkit-details-marker { display: none; }
.more-metrics summary::before { content: "+ "; }
.more-metrics[open] summary::before { content: "− "; }
.more-metrics .metric-checkbox { margin-top: 0.4rem; margin-left: 0.1rem; }

/* --- Chart --- */
.chart-section { background: var(--panel); margin: 1.5rem; padding: 1.25rem; border-radius: 10px; border: 1px solid var(--border); }

/* --- Stats cards --- */
.stats-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
  margin: 0 1.5rem 2rem;
}
.stat-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
}
.stat-card h4 { margin: 0 0 0.5rem; font-size: 0.85rem; color: var(--muted); }
.stat-card .value { font-size: 1.4rem; font-weight: 600; }
.stat-card .row { display: flex; justify-content: space-between; font-size: 0.85rem; color: var(--muted); margin-top: 0.4rem; }
.stat-card-alert { border-color: var(--danger); box-shadow: 0 0 0 1px var(--danger); }
.badge { display: inline-block; font-size: 0.7rem; font-weight: 600; padding: 0.1rem 0.45rem; border-radius: 999px; vertical-align: middle; }
.badge-low { background: #fef3c7; color: #92400e; }
.badge-high { background: #fee2e2; color: var(--danger); }

/* --- Print --- */
.print-only { display: none; }
@media print {
  .no-print { display: none !important; }
  body { background: white; }
  .chart-section, .stats-cards { margin: 0 0 1.5rem; border: none; padding: 0; box-shadow: none; }
  .chart-section { page-break-inside: avoid; }
  .print-only { display: block; margin: 0 1.5rem 1rem; }
  .print-only h2 { margin: 0 0 0.2rem; }
  .print-only p { margin: 0; color: var(--muted); font-size: 0.9rem; }
}
.print-page { padding: 1.5rem; }
.print-page h2 { border-bottom: 2px solid var(--border); padding-bottom: 0.4rem; }