:root { color-scheme: light dark; }

* { box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN",
    "Noto Sans JP", Meiryo, sans-serif;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 16px 32px;
  line-height: 1.7;
}

a { color: #2563eb; }

.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 16px 0;
  border-bottom: 1px solid #ddd;
}

.site-header .site-title {
  font-weight: 700;
  font-size: 1.1em;
  text-decoration: none;
}

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  list-style: none;
  margin: 0;
  padding: 0;
}

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

table {
  border-collapse: collapse;
  width: 100%;
  margin: 16px 0;
}

th, td {
  padding: 6px 10px;
  border-bottom: 1px solid #ddd;
  text-align: left;
  white-space: nowrap;
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 0.85em;
  font-weight: 600;
}

.badge.up { background: #dcfce7; color: #15803d; }
.badge.down { background: #fee2e2; color: #b91c1c; }
.badge.flat { background: #f3f4f6; color: #4b5563; }
.badge.new { background: #e0e7ff; color: #4338ca; }
.badge.nodata { background: #f3f4f6; color: #6b7280; }

.chart svg { display: block; margin: 16px 0; }

.site-footer {
  margin-top: 40px;
  padding-top: 16px;
  border-top: 1px solid #ddd;
  font-size: 0.85em;
  color: #555;
}

.site-footer .footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 8px 0;
  padding: 0;
}

@media (prefers-color-scheme: dark) {
  body { background: #111827; color: #e5e7eb; }
  a { color: #93c5fd; }
  th, td, .site-header, .site-footer { border-color: #374151; }
  /* 免責事項・PR表記がダークモードでも本文同等に読めるコントラストを確保する */
  .site-footer { color: #d1d5db; }
  .badge.up { background: #14532d; color: #bbf7d0; }
  .badge.down { background: #7f1d1d; color: #fecaca; }
  .badge.flat { background: #374151; color: #d1d5db; }
  .badge.new { background: #312e81; color: #c7d2fe; }
  .badge.nodata { background: #374151; color: #9ca3af; }
}