:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --text: #1c2430;
  --muted: #5d6b7c;
  --line: #d9dee5;
  --accent: #1f5fbf;
  --up: #1d7a46;
  --down: #b42318;
  --unknown: #8a6d00;
  --bar: #1c2430;
  --bar-text: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161c;
    --panel: #1b212a;
    --text: #e6eaf0;
    --muted: #9aa6b5;
    --line: #2c3541;
    --accent: #7aa7ff;
    --up: #4cc38a;
    --down: #ff7a6e;
    --unknown: #e0c050;
    --bar: #0b0e12;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", "Hiragino Sans", "Yu Gothic UI", Meiryo, sans-serif;
  line-height: 1.6;
}
.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  background: var(--bar);
  color: var(--bar-text);
}
.bar h1 { margin: 0; font-size: 1.1rem; font-weight: 600; }
.bar-link { color: var(--bar-text); font-size: .9rem; opacity: .85; }
.bar-link:hover { opacity: 1; }
.wrap { max-width: 960px; margin: 0 auto; padding: 20px 16px 48px; }
.lead { color: var(--muted); margin: 0 0 16px; }
.note { color: var(--muted); font-size: .9rem; margin-top: 24px; }

.cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}
.card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  text-decoration: none;
  min-height: 92px;
}
.card:hover, .card:focus-visible { border-color: var(--accent); }
.card-title { font-weight: 600; font-size: 1.05rem; }
.card-host { color: var(--muted); font-size: .85rem; word-break: break-all; }

/* 管理者ページ */
.banner {
  padding: 12px 14px;
  border-radius: 6px;
  border: 1px solid var(--down);
  color: var(--down);
  background: var(--panel);
  margin-bottom: 16px;
}
.banner[hidden] { display: none; }
.summary { display: flex; flex-wrap: wrap; gap: 8px 20px; color: var(--muted); margin-bottom: 16px; font-size: .95rem; }
.summary strong { color: var(--text); }
.group { margin-bottom: 24px; }
.group h2 { font-size: 1rem; margin: 0 0 8px; }
.target {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
  margin-bottom: 8px;
}
.target-head { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; }
.target-name { font-weight: 600; }
.state { font-size: .8rem; font-weight: 600; padding: 1px 8px; border-radius: 999px; border: 1px solid currentColor; }
.state-up { color: var(--up); }
.state-down { color: var(--down); }
.state-unknown { color: var(--unknown); }
.target-detail, .target-note { color: var(--muted); font-size: .85rem; margin: 4px 0 0; word-break: break-word; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.actions button {
  font: inherit;
  font-size: .9rem;
  padding: 6px 14px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
  min-height: 36px;
}
.actions button:hover { border-color: var(--accent); }
.actions button:disabled { opacity: .5; cursor: wait; }
.last {
  margin-top: 10px;
  font-size: .8rem;
  color: var(--muted);
}
.last pre {
  margin: 4px 0 0;
  max-height: 200px;
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-all;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px;
  color: var(--text);
}