:root {
  --color-bg: #f4f9fd;
  --color-text: #1c2b3a;
  --color-link: #1565a8;
  --color-link-hover: #0d4a86;
  --color-border: #cfe2f3;
  --color-muted: #5b7893;
  --color-accent-bg: #ddeeff;
  --color-header-bg: #eaf5fd;
  --max-width: 780px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.75;
}

a {
  color: var(--color-link);
  text-decoration: none;
}

a:hover {
  color: var(--color-link-hover);
  text-decoration: underline;
}

.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-header-bg);
}

.site-header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.site-title {
  font-weight: bold;
  font-size: 1.1rem;
  color: var(--color-link-hover);
}

.site-nav a {
  margin-left: 1rem;
}

.site-main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem 1rem 4rem;
}

.site-footer {
  text-align: center;
  color: var(--color-muted);
  font-size: 0.85rem;
  padding: 1rem;
  background: var(--color-header-bg);
  border-top: 1px solid var(--color-border);
}

h1, h2, h3, h4 {
  line-height: 1.4;
  color: var(--color-link-hover);
}

.article-title {
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 0.5rem;
}

.article-categories {
  margin: 0.5rem 0 1rem;
}

.category-tag {
  display: inline-block;
  background: var(--color-accent-bg);
  color: var(--color-link-hover);
  border-radius: 4px;
  padding: 0.15rem 0.6rem;
  margin-right: 0.4rem;
  font-size: 0.85rem;
}

.article-body table.wikitable {
  border-collapse: collapse;
  width: 100%;
  margin: 1rem 0;
}

.article-body table.wikitable th,
.article-body table.wikitable td {
  border: 1px solid var(--color-border);
  padding: 0.4rem 0.6rem;
  text-align: left;
  vertical-align: top;
}

.article-body table.wikitable th {
  background: var(--color-accent-bg);
}

.article-body img {
  max-width: 100%;
}

.article-list {
  list-style: none;
  padding: 0;
  column-width: 220px;
}

.article-list li {
  padding: 0.15rem 0;
}

.category-list {
  list-style: none;
  padding: 0;
}

.home-section {
  margin: 2rem 0;
}

.home-banner {
  margin: 0 0 2rem;
}

.home-banner img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 6px;
}

.kana-index-preview a {
  margin-right: 0.8rem;
}

.kana-index-more {
  color: var(--color-muted);
}

#search-input {
  width: 100%;
  max-width: 400px;
  padding: 0.5rem;
  font-size: 1rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: #fff;
  color: var(--color-text);
}

.search-empty {
  color: var(--color-muted);
}