:root {
  --bg: #f7f8fa;
  --panel: #ffffff;
  --panel-hover: #eef1f6;
  --border: #d9dee7;
  --text: #1a1d23;
  --text-dim: #556070;
  --accent: #1d4ed8;
  --up: #0a8a5a;
  --down: #c81e1e;
  --checking: #a15c00;
  --header-grad-top: #eef2f8;
  --badge-bg: #e4ebf6;
  --badge-fg: #1d3b74;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.04), 0 1px 3px rgba(16, 24, 40, 0.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --panel: #171a21;
    --panel-hover: #1d212b;
    --border: #262b36;
    --text: #e6e8ee;
    --text-dim: #9aa3b2;
    --accent: #6aa5ff;
    --up: #38d39f;
    --down: #ff5e5e;
    --checking: #c9a93a;
    --header-grad-top: #13161d;
    --badge-bg: #2a3142;
    --badge-fg: #b6c3dc;
    --shadow: none;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
    "Noto Sans JP", "Yu Gothic UI", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-header {
  padding: 32px 0 24px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, var(--header-grad-top) 0%, var(--bg) 100%);
}
.site-header h1 {
  margin: 0 0 4px;
  font-size: 28px;
  letter-spacing: 0.02em;
}
.tagline {
  margin: 0 0 16px;
  color: var(--text-dim);
}
.meta {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 14px;
}
.meta .label { color: var(--text-dim); margin-right: 4px; }
#refresh {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 6px 14px;
  cursor: pointer;
  font-size: 13px;
}
#refresh:hover { background: var(--panel-hover); }
#refresh:disabled { opacity: 0.5; cursor: wait; }

.group { margin: 32px 0; }
.group h2 {
  margin: 0 0 4px;
  font-size: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.group-desc {
  margin: 0 0 16px;
  color: var(--text-dim);
  font-size: 14px;
}
.badge {
  display: inline-block;
  font-size: 11px;
  background: var(--badge-bg);
  color: var(--badge-fg);
  padding: 2px 8px;
  border-radius: 999px;
  font-weight: normal;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  box-shadow: var(--shadow);
  transition: background 0.15s, transform 0.15s, box-shadow 0.15s;
}
.card:hover { background: var(--panel-hover); }

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.card-title {
  font-size: 16px;
  font-weight: 600;
  margin: 0;
}
.card-subtitle {
  color: var(--text-dim);
  font-size: 13px;
  margin: 0;
}
.card-desc {
  font-size: 13px;
  color: var(--text-dim);
  margin: 4px 0 0;
  min-height: 2.4em;
}
.card-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 10px;
  border-top: 1px dashed var(--border);
  font-size: 12px;
  color: var(--text-dim);
}
.card-foot a {
  font-size: 12px;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-dim);
}
.dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  display: inline-block;
  background: var(--text-dim);
}
.dot-up { background: var(--up); }
.dot-down { background: var(--down); }
.dot-checking {
  background: var(--checking);
  animation: pulse 1s infinite ease-in-out;
}
@keyframes pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

.legend {
  margin: 40px 0;
  padding: 18px 20px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 13px;
}
.legend h3 { margin: 0 0 10px; font-size: 14px; }
.legend ul {
  list-style: none;
  padding: 0;
  margin: 0 0 10px;
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}
.legend .note {
  margin: 0;
  color: var(--text-dim);
  font-size: 12px;
}

.site-footer {
  padding: 24px 0;
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  margin-top: 40px;
}

@media (max-width: 600px) {
  .site-header h1 { font-size: 22px; }
  .cards { grid-template-columns: 1fr; }
}