/* ============================================
   BASE
============================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-primary:   #2c7a4b;   /* メインカラー（緑系）→ 自由に変更 */
  --color-accent:    #e87b35;   /* アクセントカラー */
  --color-text:      #333333;
  --color-muted:     #888888;
  --color-border:    #e0e0e0;
  --color-bg:        #f7f7f5;
  --color-card:      #ffffff;

  --font-base:  'Noto Sans JP', sans-serif;
  --font-serif: 'Noto Serif JP', serif;

  --max-width:  1100px;
  --sidebar-w:  300px;
  --gap:        2rem;
  --radius:     6px;
}

body {
  font-family: var(--font-base);
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  background: var(--color-bg);
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

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

/* ============================================
   LAYOUT WRAPPER
============================================ */
.l-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.l-two-col {
  display: grid;
  grid-template-columns: 1fr var(--sidebar-w);
  gap: var(--gap);
  align-items: start;
  padding: var(--gap) 0;
}

/* ============================================
   HEADER
============================================ */
.site-header {
  background: var(--color-card);
  border-bottom: 3px solid var(--color-primary);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 6px rgba(0,0,0,.08);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
}

.site-logo {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
}
.site-logo span { color: var(--color-accent); }

/* グローバルナビ */
.global-nav__list {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  font-size: .9rem;
}
.global-nav__list a {
  color: var(--color-text);
  font-weight: 500;
  padding: .25rem 0;
  border-bottom: 2px solid transparent;
  transition: border-color .2s;
}
.global-nav__list a:hover,
.global-nav__list a.is-active {
  border-bottom-color: var(--color-primary);
  text-decoration: none;
  color: var(--color-primary);
}

/* 検索フォーム */
.header-search {
  display: flex;
  gap: .5rem;
}
.header-search input {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: .35rem .75rem;
  font-size: .9rem;
  width: 160px;
}
.header-search button {
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  padding: .35rem .75rem;
  cursor: pointer;
  font-size: .9rem;
}

/* ============================================
   BREADCRUMB
============================================ */
.breadcrumb {
  background: var(--color-card);
  border-bottom: 1px solid var(--color-border);
  font-size: .8rem;
  color: var(--color-muted);
}
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: .25rem;
  list-style: none;
  padding: .6rem 1.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
}
.breadcrumb__list li + li::before { content: "›"; margin-right: .25rem; }
.breadcrumb__list a { color: var(--color-muted); }

/* ============================================
   ARTICLE (MAIN CONTENT)
============================================ */
.article {
  background: var(--color-card);
  border-radius: var(--radius);
  padding: 2rem;
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
}

/* --- ヘッダー部 --- */
.article__category {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  font-size: .75rem;
  padding: .2rem .7rem;
  border-radius: 3px;
  margin-bottom: .75rem;
  font-weight: 600;
  letter-spacing: .05em;
}

.article__title {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  line-height: 1.4;
  margin-bottom: .75rem;
}

.article__meta {
  display: flex;
  gap: 1rem;
  font-size: .8rem;
  color: var(--color-muted);
  margin-bottom: 1.5rem;
}
.article__meta time::before { content: "📅 "; }

/* サムネイル */
.article__thumbnail {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
  background: var(--color-border); /* 画像なし時のフォールバック */
}

/* --- SNSシェアボタン --- */
.share-buttons {
  display: flex;
  gap: .5rem;
  flex-wrap: wrap;
  margin: 1.5rem 0;
}
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .4rem 1rem;
  border-radius: 4px;
  font-size: .82rem;
  font-weight: 600;
  color: #fff;
  cursor: pointer;
  border: none;
  text-decoration: none;
}
.share-btn--twitter  { background: #1da1f2; }
.share-btn--facebook { background: #1877f2; }
.share-btn--hatena   { background: #00a4de; }
.share-btn--line     { background: #06c755; }

/* --- 目次 --- */
.toc {
  background: #f0f4f1;
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
}
.toc__title {
  font-weight: 700;
  font-size: .95rem;
  margin-bottom: .75rem;
  color: var(--color-primary);
}
.toc__list {
  list-style: none;
  counter-reset: toc;
}
.toc__list li {
  counter-increment: toc;
  padding: .25rem 0;
  font-size: .9rem;
}
.toc__list li::before {
  content: counter(toc) ". ";
  color: var(--color-primary);
  font-weight: 700;
  margin-right: .3rem;
}
.toc__list a { color: var(--color-text); }
.toc__list--sub {
  list-style: none;
  margin-left: 1.2rem;
}
.toc__list--sub li::before { content: "• "; }

/* --- 本文タイポグラフィ --- */
.article__body h2 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  border-left: 5px solid var(--color-primary);
  border-bottom: 1px solid var(--color-border);
  padding: .5rem 0 .5rem .75rem;
  margin: 2rem 0 1rem;
}
.article__body h3 {
  font-size: 1.15rem;
  border-bottom: 2px dashed var(--color-border);
  padding-bottom: .4rem;
  margin: 1.75rem 0 .75rem;
}
.article__body p { margin-bottom: 1.2rem; }
.article__body ul,
.article__body ol { margin: 0 0 1.2rem 1.5rem; }
.article__body li { margin-bottom: .4rem; }
.article__body blockquote {
  border-left: 4px solid var(--color-accent);
  background: #fdf6ee;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  color: #555;
  border-radius: 0 var(--radius) var(--radius) 0;
}

/* --- 著者ボックス --- */
.author-box {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  background: #f9faf9;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-top: 2.5rem;
}
.author-box__avatar {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  background: var(--color-border);
}
.author-box__name { font-weight: 700; margin-bottom: .25rem; font-size: .95rem; }
.author-box__bio  { font-size: .85rem; color: var(--color-muted); }

/* ============================================
   SIDEBAR
============================================ */
.sidebar { display: flex; flex-direction: column; gap: 1.5rem; }

.widget {
  background: var(--color-card);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
}
.widget__title {
  font-weight: 700;
  font-size: .95rem;
  border-bottom: 2px solid var(--color-primary);
  padding-bottom: .5rem;
  margin-bottom: 1rem;
  color: var(--color-primary);
}

/* 関連記事・人気記事リスト */
.post-list { list-style: none; display: flex; flex-direction: column; gap: .75rem; }
.post-list__item a {
  display: flex;
  gap: .75rem;
  align-items: flex-start;
  color: var(--color-text);
  font-size: .875rem;
  line-height: 1.5;
}
.post-list__item a:hover { color: var(--color-primary); text-decoration: none; }
.post-list__thumb {
  width: 60px;
  height: 60px;
  object-fit: cover;
  border-radius: 4px;
  flex-shrink: 0;
  background: var(--color-border);
}

/* カテゴリーリスト */
.category-list { list-style: none; }
.category-list li {
  display: flex;
  justify-content: space-between;
  padding: .4rem 0;
  border-bottom: 1px solid var(--color-border);
  font-size: .875rem;
}
.category-list li:last-child { border-bottom: none; }
.category-list .count {
  color: var(--color-muted);
  font-size: .8rem;
}

/* タグクラウド */
.tag-cloud { display: flex; flex-wrap: wrap; gap: .5rem; }
.tag-cloud a {
  background: #eef2ef;
  color: var(--color-text);
  font-size: .78rem;
  padding: .25rem .65rem;
  border-radius: 20px;
  border: 1px solid var(--color-border);
  transition: background .2s;
}
.tag-cloud a:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
  text-decoration: none;
}

/* ============================================
   FOOTER
============================================ */
.site-footer {
  background: #2a2a2a;
  color: #ccc;
  margin-top: 3rem;
  padding: 2.5rem 1.5rem 1.5rem;
}
.site-footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
}
.site-footer__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-bottom: 2rem;
}
.site-footer__col h4 {
  font-size: .9rem;
  color: #fff;
  margin-bottom: .75rem;
  border-bottom: 1px solid #444;
  padding-bottom: .5rem;
}
.site-footer__col ul { list-style: none; }
.site-footer__col ul li { margin-bottom: .4rem; }
.site-footer__col ul a { color: #aaa; font-size: .85rem; }
.site-footer__col ul a:hover { color: #fff; }

.site-footer__copy {
  text-align: center;
  font-size: .8rem;
  color: #777;
  border-top: 1px solid #444;
  padding-top: 1rem;
}

/* ============================================
   UTILITIES
============================================ */
.u-visually-hidden {
  position: absolute; width: 1px; height: 1px;
  overflow: hidden; clip: rect(0,0,0,0);
}

/* ============================================
   RESPONSIVE
============================================ */
@media (max-width: 768px) {
  .l-two-col {
    grid-template-columns: 1fr;
  }
  .global-nav__list { display: none; } /* ハンバーガーメニューに差し替え推奨 */
  .article__title { font-size: 1.4rem; }
  .site-footer__grid { grid-template-columns: 1fr; }
}