* { box-sizing: border-box; }
body {
  font-family: 'Hiragino Sans', 'Noto Sans CJK JP', system-ui, sans-serif;
  background: #f6f8fa;
  color: #1f2328;
  margin: 0;
  line-height: 1.65;
}
header {
  background: #BF0000;
  color: #fff;
  padding: 14px 20px;
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  gap: 16px;
  align-items: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
header a { color: #fff; text-decoration: none; font-weight: 600; }
header a:hover { opacity: 0.85; }
main {
  max-width: 920px;
  margin: 0 auto;
  background: #fff;
  padding: 24px 28px;
  min-height: calc(100vh - 56px);
  box-shadow: 0 0 12px rgba(0,0,0,0.06);
}
h1 { color: #BF0000; border-bottom: 2px solid #BF0000; padding-bottom: 8px; font-size: 24px; }
h2 { color: #BF0000; border-bottom: 1px solid #d0d7de; padding-bottom: 6px; margin-top: 28px; font-size: 19px; }
h3 { color: #24292f; margin-top: 18px; font-size: 16px; }
table { border-collapse: collapse; width: 100%; font-size: 13.5px; margin: 8px 0; display: block; overflow-x: auto; }
th, td { border: 1px solid #d0d7de; padding: 7px 10px; text-align: left; vertical-align: top; }
th { background: #f6f8fa; font-weight: 600; }
tr:nth-child(even) td { background: #fafbfc; }
a { color: #0969da; text-decoration: none; word-break: break-all; }
a:hover { text-decoration: underline; }
code { background: #f6f8fa; padding: 2px 6px; border-radius: 4px; font-size: 13px; }
pre { background: #f6f8fa; padding: 14px; border-radius: 6px; overflow-x: auto; font-size: 13px; }
pre code { background: transparent; padding: 0; }
blockquote { border-left: 4px solid #BF0000; padding: 4px 14px; color: #57606a; margin: 10px 0; background: #fafbfc; }
img { max-width: 320px; height: auto; border-radius: 6px; margin: 8px 0; }
ul, ol { padding-left: 26px; }
li { margin: 3px 0; }
strong { color: #BF0000; }
hr { border: none; border-top: 1px solid #d0d7de; margin: 24px 0; }
.product-list { list-style: none; padding: 0; }
.product-list li { background: #fff; border: 1px solid #d0d7de; border-radius: 8px; padding: 12px 16px; margin: 8px 0; transition: box-shadow 0.15s; }
.product-list li:hover { box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.product-list a { font-weight: 600; }
.meta { color: #57606a; font-size: 13px; margin-top: 4px; }
.section-title { color: #BF0000; margin: 24px 0 8px; }
.empty { color: #8c959f; font-style: italic; padding: 16px; }
.stale-banner {
  background: #fff8c5;
  border: 1px solid #d4a72c;
  border-left: 4px solid #d4a72c;
  color: #57430a;
  padding: 10px 14px;
  border-radius: 6px;
  margin: 0 0 16px;
  font-size: 14px;
}
.stale-banner strong { color: #b58105; }
.fav-wrap { margin: 0 0 16px; }
.fav-btn {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 6px 12px; background: #fff; border: 1px solid #d0d7de;
  border-radius: 6px; color: #1f2328; font-size: 13px;
  cursor: pointer; transition: background 0.15s, border-color 0.15s;
  font-family: inherit;
}
.fav-btn:hover:not(:disabled) { background: #f6f8fa; border-color: #BF0000; }
.fav-btn:disabled { cursor: default; opacity: 0.85; }
.fav-btn-primary {
  background: #BF0000; color: #fff; border-color: #BF0000;
  font-size: 14px; padding: 8px 16px; font-weight: 600;
}
.fav-btn-primary:hover:not(:disabled) { background: #a00000; }
.fav-added { background: #dafbe1 !important; border-color: #4ac26b !important; color: #1a7f37 !important; }
.fav-error { background: #ffebe9 !important; border-color: #cf222e !important; color: #cf222e !important; }
@media (max-width: 720px) {
  main { padding: 16px; box-shadow: none; }
  table { font-size: 12px; }
  th, td { padding: 5px 7px; }
  img { max-width: 200px; }
}