/* 実務ラボ 共通スタイル（シンプル・レスポンシブ・可読性優先） */

:root {
  --color-bg: #ffffff;
  --color-text: #222222;
  --color-muted: #666666;
  --color-border: #e2e2e2;
  --color-accent: #1a5f7a;
  --color-accent-bg: #f2f7f9;
  --max-width: 760px;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic",
    "Noto Sans JP", "Meiryo", sans-serif;
  line-height: 1.85;
  font-size: 17px;
}

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

a:hover {
  text-decoration: none;
}

.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: 1.2rem 1.25rem;
  text-align: center;
}

.site-logo {
  font-size: 1.5rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--color-text);
}

.site-tagline {
  margin: 0.3rem 0 0;
  color: var(--color-muted);
  font-size: 0.9rem;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}

.breadcrumb {
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-bottom: 1.25rem;
}

.breadcrumb a {
  color: var(--color-muted);
}

.hero {
  text-align: center;
  padding: 2rem 0 1.5rem;
}

.hero h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.categories {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin: 1.5rem 0;
}

@media (min-width: 640px) {
  .categories {
    grid-template-columns: repeat(3, 1fr);
  }
}

.category-card {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.25rem;
  background: var(--color-accent-bg);
}

.category-card h2 {
  margin-top: 0;
  font-size: 1.15rem;
}

.category-card .count {
  color: var(--color-muted);
  font-size: 0.85rem;
  margin-bottom: 0;
}

.all-articles-link {
  text-align: center;
  margin-top: 1.5rem;
}

.category-desc {
  color: var(--color-muted);
}

.count {
  color: var(--color-muted);
  font-size: 0.9rem;
}

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

.article-list li {
  border-bottom: 1px solid var(--color-border);
  padding: 0.9rem 0;
}

.article-list.plain li {
  padding: 0.4rem 0;
  border-bottom: none;
}

.article-list a {
  font-size: 1.05rem;
  font-weight: 600;
  text-decoration: none;
}

.article-list a:hover {
  text-decoration: underline;
}

.article-list .excerpt {
  margin: 0.35rem 0 0;
  color: var(--color-muted);
  font-size: 0.9rem;
}

.article h1 {
  font-size: 1.6rem;
  line-height: 1.5;
  margin-bottom: 1.5rem;
}

.article h2 {
  font-size: 1.25rem;
  margin-top: 2.2rem;
  border-left: 4px solid var(--color-accent);
  padding-left: 0.6rem;
}

.article h3 {
  font-size: 1.05rem;
  margin-top: 1.6rem;
}

.article p {
  margin: 1rem 0;
}

.article ul,
.article ol {
  padding-left: 1.4rem;
}

.article li {
  margin: 0.4rem 0;
}

.article blockquote {
  margin: 1.2rem 0;
  padding: 0.6rem 1rem;
  background: var(--color-accent-bg);
  border-left: 4px solid var(--color-accent);
  color: var(--color-muted);
}

.article code {
  background: #f2f2f2;
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  font-size: 0.9em;
}

.article hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2rem 0;
}

.back-link {
  margin-top: 2.5rem;
}

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 1.5rem 1.25rem;
  text-align: center;
  color: var(--color-muted);
  font-size: 0.8rem;
}

.site-footer p {
  margin: 0.3rem 0;
}

img {
  max-width: 100%;
  height: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.9rem;
  overflow-x: auto;
  display: block;
}

table th,
table td {
  border: 1px solid var(--color-border);
  padding: 0.5rem;
  text-align: left;
}