:root {
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

/* overflow-x:hidden で溢れを隠さない。溢れる要素（表）は .table-wrap 側で処理する。 */
html, body {
  margin: 0;
  padding: 0;
  max-width: 100%;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", "Hiragino Sans", "Yu Gothic", sans-serif;
  line-height: 1.8;
  color: #1a1a1a;
  background: #ffffff;
  word-break: break-word;
  overflow-wrap: anywhere;
}

.site-header {
  border-bottom: 1px solid #ddd;
  padding: 0.75rem 1rem;
}

.site-header-inner {
  max-width: 42rem;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.site-name {
  font-weight: bold;
  margin: 0;
}

.site-name a {
  color: inherit;
  text-decoration: none;
}

.site-nav a {
  margin-left: 1rem;
  text-decoration: none;
  color: #0645ad;
}

.site-nav a:first-child {
  margin-left: 0;
}

.site-main {
  max-width: 42rem;
  margin: 0 auto;
  padding: 1rem 1rem 2rem 1rem;
}

.site-main h1 {
  font-size: 1.55rem;
  line-height: 1.45;
  margin: 0.5rem 0 1.5rem 0;
}

/* 記事ページの所属カテゴリ表示（h1の上） */
.category-label {
  margin: 0.6rem 0 0 0;
  font-size: 0.85rem;
  color: #555;
}

/* トップのカテゴリ別一覧 */
.category {
  margin-top: 2rem;
}

.category h2 {
  border-left: 4px solid #0645ad;
  padding-left: 0.6rem;
}

.category-desc {
  color: #444;
}

.pr-notice {
  border: 1px solid #c9c9c9;
  background: #f7f7f7;
  padding: 0.6rem 0.8rem;
  font-weight: bold;
  margin: 0 0 1.2rem 0;
}

.site-main h2 {
  margin-top: 2rem;
  font-size: 1.3rem;
  line-height: 1.5;
}

.site-main h3 {
  margin-top: 1.5rem;
  font-size: 1.1rem;
  line-height: 1.5;
}

.site-main p {
  margin: 1rem 0;
}

.site-main ul, .site-main ol {
  padding-left: 1.5rem;
}

.site-main li {
  margin: 0.4rem 0;
}

.site-main a {
  color: #0645ad;
  overflow-wrap: anywhere;
}

.site-main hr {
  border: none;
  border-top: 1px solid #ddd;
  margin: 2rem 0;
}

.table-wrap {
  overflow-x: auto;
  margin: 1rem 0;
  -webkit-overflow-scrolling: touch;
}

table {
  border-collapse: collapse;
  width: 100%;
  min-width: 40rem;
}

th, td {
  border: 1px solid #ddd;
  padding: 0.5rem 0.7rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: #f5f5f5;
}

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

.site-footer p {
  max-width: 42rem;
  margin: 0.3rem auto;
}