:root {
  color-scheme: dark;
  --bg: #0d1117;
  --panel: #161b22;
  --border: #30363d;
  --text: #e6edf3;
  --muted: #8b949e;
  --green: #3fb950;
  --red: #f85149;
  --yellow: #d29922;
  --blue: #58a6ff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "Hiragino Kaku Gothic ProN", sans-serif;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 20px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.title h1 { font-size: 20px; margin: 0; }
.title .sub { font-size: 12px; color: var(--muted); }
.last-updated { font-size: 12px; color: var(--muted); }

main { max-width: 1100px; margin: 0 auto; padding: 16px 20px 40px; }

.status-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
}
.card .card-name { font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.card .card-status { font-size: 22px; font-weight: 700; }
.card .card-reason { font-size: 12px; color: var(--muted); margin-top: 6px; word-break: break-all; }
.card.loading { color: var(--muted); }

.status-up { color: var(--green); }
.status-down { color: var(--red); }
.status-unknown { color: var(--muted); }

.badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
}
.badge.up { background: rgba(63,185,80,0.15); color: var(--green); }
.badge.down { background: rgba(248,81,73,0.15); color: var(--red); }

.filters {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}
.filters label { font-size: 13px; color: var(--muted); }
.filters select { margin-left: 6px; }
.filters .inline { display: inline-flex; align-items: center; gap: 6px; }

select, button {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 10px;
  font-size: 13px;
}
button.primary { background: var(--blue); color: #fff; border-color: transparent; font-weight: 600; cursor: pointer; }
button.primary:hover { filter: brightness(1.1); }
button.primary:disabled { opacity: 0.5; cursor: default; }

.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: 8px; }

table { width: 100%; border-collapse: collapse; background: var(--panel); font-size: 13px; }
th, td { padding: 8px 12px; text-align: left; border-bottom: 1px solid var(--border); white-space: nowrap; }
th { color: var(--muted); font-weight: 600; position: sticky; top: 0; background: var(--panel); }
td.col-reason { white-space: normal; word-break: break-all; min-width: 260px; }
tr.group-end td { border-bottom-color: rgba(48,54,61,0.6); }
tr.group-end:last-child td { border-bottom: none; }
td.empty { text-align: center; color: var(--muted); padding: 24px; }

@media (max-width: 640px) {
  .topbar { flex-direction: column; align-items: flex-start; }
}