:root {
  color-scheme: light;
  --surface-1:      #fcfcfb;
  --page-plane:     #f9f9f7;
  --text-primary:   #0b0b0b;
  --text-secondary: #52514e;
  --text-muted:     #898781;
  --gridline:       #e1e0d9;
  --baseline:       #c3c2b7;
  --border:         rgba(11, 11, 11, 0.10);
  --series-1:       #2a78d6;
  --series-1-soft:  #cde2fb;
  --status-good:    #0ca30c;
  --status-good-text: #006300;
  --status-warning: #fab219;
  --status-critical: #d03b3b;
  --weekend-tint:   rgba(11, 11, 11, 0.035);
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --surface-1:      #1a1a19;
    --page-plane:     #0d0d0d;
    --text-primary:   #ffffff;
    --text-secondary: #c3c2b7;
    --text-muted:     #898781;
    --gridline:       #2c2c2a;
    --baseline:       #383835;
    --border:         rgba(255, 255, 255, 0.10);
    --series-1:       #3987e5;
    --series-1-soft:  #184f95;
    --status-good:    #0ca30c;
    --status-good-text: #0ca30c;
    --status-warning: #fab219;
    --status-critical: #e66767;
    --weekend-tint:   rgba(255, 255, 255, 0.045);
  }
}

* { box-sizing: border-box; }

body {
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--page-plane);
  color: var(--text-primary);
  margin: 0;
  padding: 2rem 1.25rem 4rem;
}

.page {
  max-width: 1000px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.topbar h1 {
  font-size: 1.5rem;
  margin: 0 0 0.15rem;
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.topbar .modem-tag {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.topbar p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.card {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
}

.card h2 {
  margin: 0 0 1rem;
  font-size: 1rem;
  color: var(--text-primary);
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem 1.5rem;
  align-items: end;
}

.filters form {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: end;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

input[type="text"], input[type="date"], input[type="month"] {
  font: inherit;
  font-size: 0.9rem;
  color: var(--text-primary);
  background: var(--surface-1);
  border: 1px solid var(--baseline);
  border-radius: 6px;
  padding: 0.4rem 0.55rem;
}

input:focus {
  outline: 2px solid var(--series-1);
  outline-offset: 1px;
}

.btn {
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 6px;
  padding: 0.5rem 0.9rem;
  border: 1px solid transparent;
  cursor: pointer;
  background: var(--series-1);
  color: #ffffff;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--baseline);
}

.divider {
  width: 1px;
  align-self: stretch;
  background: var(--gridline);
  margin: 0 0.25rem;
}

.alert {
  border-radius: 8px;
  padding: 0.75rem 1rem;
  font-size: 0.9rem;
  font-weight: 600;
}

.alert-critical {
  background: color-mix(in srgb, var(--status-critical) 12%, var(--surface-1));
  color: var(--status-critical);
}

.alert-ok {
  background: color-mix(in srgb, var(--status-good) 12%, var(--surface-1));
  color: var(--status-good-text);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 0.9rem;
}

.stat-tile {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.1rem;
  border-left: 3px solid var(--baseline);
}

.stat-tile .stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0.3rem;
}

.stat-tile .stat-value {
  font-size: 1.55rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1.15;
}

.stat-tile .stat-sub {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-top: 0.2rem;
}

.stat-tile.status-good { border-left-color: var(--status-good); }
.stat-tile.status-good .stat-value { color: var(--status-good-text); }
.stat-tile.status-critical { border-left-color: var(--status-critical); }
.stat-tile.status-critical .stat-value { color: var(--status-critical); }

.chart-card canvas {
  max-height: 260px;
}

.legend-note {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 0.75rem;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.legend-note .dot {
  display: inline-block;
  width: 9px;
  height: 9px;
  border-radius: 2px;
  margin-right: 0.35rem;
}

.table-scroll {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

thead th {
  position: sticky;
  top: 0;
  background: var(--surface-1);
  text-align: left;
  padding: 0.5rem 0.6rem;
  border-bottom: 1px solid var(--baseline);
  color: var(--text-muted);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  font-weight: 600;
}

tbody td {
  padding: 0.4rem 0.6rem;
  border-bottom: 1px solid var(--gridline);
  font-variant-numeric: tabular-nums;
}

tbody tr.weekend {
  background: var(--weekend-tint);
}

tbody tr.no-data td {
  color: var(--text-muted);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.12rem 0.45rem;
  border-radius: 999px;
  margin-right: 0.3rem;
  white-space: nowrap;
}

.chip-warning {
  background: color-mix(in srgb, var(--status-warning) 20%, var(--surface-1));
  color: color-mix(in srgb, var(--status-warning) 65%, var(--text-primary));
}

.chip-ok {
  background: color-mix(in srgb, var(--status-good) 16%, var(--surface-1));
  color: var(--status-good-text);
}

.sync-log summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-primary);
}

.sync-log[open] summary {
  margin-bottom: 0.9rem;
}

.chip-critical {
  background: color-mix(in srgb, var(--status-critical) 16%, var(--surface-1));
  color: var(--status-critical);
}

@media (max-width: 640px) {
  body { padding: 1.25rem 0.75rem 3rem; }
  .filters { flex-direction: column; align-items: stretch; }
  .filters form { flex-direction: column; align-items: stretch; }
  .divider { display: none; }
}