/* ======================================================
   デザイン経営ラボ丼 — Blog CSS
   メインサイト(index.html)のデザイントークンに準拠
====================================================== */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;500;700;900&family=Noto+Serif+JP:wght@400;700&display=swap');

/* ── CSS変数 ───────────────────────────────────────── */
:root {
  --color-paper:   #FAF5ED;
  --color-cream:   #F0E6D0;
  --color-ink:     #3A2A1A;
  --color-muted:   #907060;
  --color-rule:    #D8C0A0;
  --color-don:     #2EAFDF;
  --color-accent:  #65A2D6;
  --color-accent2: #C8724A;
  --color-white:   #FFFFFF;
  --font-sans:  'Noto Sans JP', sans-serif;
  --font-serif: 'Noto Serif JP', serif;
  --max-width: 760px;
  --max-width-list: 1100px;
}

/* ── リセット ──────────────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-sans);
  background: var(--color-paper);
  color: var(--color-ink);
  line-height: 1.8;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
:focus-visible {
  outline: 2px solid var(--color-don);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ── ヘッダー（メインサイトと共通） ───────────────── */
.nav {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(250, 245, 237, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-rule);
  height: 64px;
}
.nav-inner {
  max-width: var(--max-width-list);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.nav-logo-don {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-ink);
  letter-spacing: 0.02em;
}
.nav-logo-don span {
  color: var(--color-don);
  display: inline-block;
  margin-left: 0.22em;
  font-size: 1.28em;
  line-height: 1;
}
.nav-logo-sub {
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--color-muted);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}
.nav-links a {
  font-size: 13px;
  color: var(--color-muted);
  letter-spacing: 0.06em;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--color-accent); }
.nav-links .nav-blog { color: var(--color-accent); font-weight: 700; }
.nav-cta {
  background: var(--color-accent2) !important;
  color: var(--color-white) !important;
  padding: 10px 22px;
  font-weight: 700;
  border-radius: 2px;
  transition: background 0.2s !important;
}
.nav-cta:hover { background: var(--color-ink) !important; }
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 6px;
  background: none;
  border: none;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-ink);
  transition: all 0.3s ease;
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.mobile-menu {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  background: var(--color-paper);
  border-bottom: 1px solid var(--color-rule);
  padding: 24px;
  z-index: 199;
  flex-direction: column;
  gap: 4px;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  font-size: 15px;
  color: var(--color-ink);
  letter-spacing: 0.06em;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-rule);
}
.mobile-menu a:last-child { border-bottom: none; }

/* ── フッター（メインサイトと共通） ───────────────── */
.footer {
  background: var(--color-ink);
  color: rgba(255,255,255,0.32);
  padding: 48px 24px;
  text-align: center;
  margin-top: 80px;
}
.footer-logo {
  font-family: var(--font-serif);
  font-size: 18px;
  color: rgba(255,255,255,0.6);
  margin-bottom: 6px;
}
.footer-logo span {
  color: var(--color-don);
  display: inline-block;
  margin-left: 0.22em;
  font-size: 1.28em;
  line-height: 1;
}
.footer-tagline { font-size: 11px; letter-spacing: 0.14em; color: rgba(255,255,255,0.28); margin-bottom: 16px; }
.footer-links { margin-bottom: 12px; }
.footer-links a { font-size: 11px; color: rgba(255,255,255,0.38); letter-spacing: 0.08em; }
.footer-links a:hover { color: rgba(255,255,255,0.7); }
.footer-copy { font-size: 11px; letter-spacing: 0.1em; }

/* ══════════════════════════════════════════════════════
   記事一覧ページ (.blog-main)
══════════════════════════════════════════════════════ */
.blog-main {
  max-width: var(--max-width-list);
  margin: 0 auto;
  padding: 60px 24px 40px;
}

.blog-list-title {
  font-family: var(--font-serif);
  font-size: clamp(22px, 3.5vw, 32px);
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 32px;
}

/* カテゴリナビ */
.category-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 48px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-rule);
}
.category-nav a {
  display: inline-block;
  padding: 6px 18px;
  border: 1px solid var(--color-rule);
  border-radius: 100px;
  font-size: 13px;
  color: var(--color-muted);
  letter-spacing: 0.04em;
  background: var(--color-white);
  transition: all 0.2s;
}
.category-nav a:hover,
.category-nav a.active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-white);
}

/* カードグリッド */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
  margin-bottom: 56px;
}

.card {
  background: var(--color-white);
  border: 1px solid var(--color-rule);
  border-radius: 6px;
  overflow: hidden;
  transition: box-shadow 0.25s, transform 0.25s;
}
.card:hover {
  box-shadow: 0 6px 24px rgba(58, 42, 26, 0.10);
  transform: translateY(-3px);
}
.card > a {
  display: block;
  padding: 24px 26px 26px;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.card-category {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-white);
  background: var(--color-accent);
  padding: 3px 10px;
  border-radius: 3px;
}
.card-meta time {
  font-size: 12px;
  color: var(--color-muted);
  letter-spacing: 0.04em;
}
.card-title {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--color-ink);
  margin-bottom: 10px;
}
.card > a:hover .card-title { color: var(--color-accent); }
.card-desc {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.75;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ページネーション */
.pager {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 24px;
  padding-top: 20px;
}
.pager-prev,
.pager-next {
  display: inline-block;
  padding: 10px 22px;
  border: 1px solid var(--color-rule);
  border-radius: 3px;
  font-size: 14px;
  color: var(--color-muted);
  background: var(--color-white);
  transition: all 0.2s;
}
.pager-prev:hover,
.pager-next:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-white);
}
.pager-info {
  font-size: 13px;
  color: var(--color-muted);
  letter-spacing: 0.06em;
}

/* ══════════════════════════════════════════════════════
   パンくず (.breadcrumb)
══════════════════════════════════════════════════════ */
.breadcrumb {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 20px 24px 0;
}
.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  color: var(--color-muted);
}
.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 4px;
}
.breadcrumb li + li::before {
  content: '›';
  color: var(--color-rule);
  font-size: 15px;
  line-height: 1;
}
.breadcrumb a {
  color: var(--color-muted);
  transition: color 0.2s;
}
.breadcrumb a:hover { color: var(--color-accent); }
.breadcrumb li[aria-current="page"] {
  color: var(--color-ink);
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 280px;
}
/* 一覧ページ内のパンくず：max-width不要・上部padding調整 */
.blog-main .breadcrumb {
  max-width: none;
  padding: 0 0 4px;
  margin-bottom: 16px;
}

/* ══════════════════════════════════════════════════════
   記事ページ (.post-main)
══════════════════════════════════════════════════════ */
.post-main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 60px 24px 40px;
}

.post-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
}
.post-category {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-white);
  background: var(--color-accent);
  padding: 4px 12px;
  border-radius: 3px;
  transition: background 0.2s;
}
.post-category:hover { background: var(--color-don); }
.post-meta time {
  font-size: 13px;
  color: var(--color-muted);
  letter-spacing: 0.04em;
}

.post-title {
  font-family: var(--font-serif);
  font-size: clamp(22px, 4vw, 32px);
  font-weight: 700;
  line-height: 1.45;
  color: var(--color-ink);
  margin-bottom: 20px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-rule);
}

.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 40px;
}
.tag {
  display: inline-block;
  font-size: 12px;
  color: var(--color-muted);
  background: var(--color-cream);
  padding: 4px 12px;
  border-radius: 100px;
  border: 1px solid var(--color-rule);
}

/* ── 記事ラッパー ─────────────────────────────────── */
.post { width: 100%; }

/* ── 記事本文 ──────────────────────────────────────── */
.post-body {
  font-size: 16px;
  line-height: 1.9;
  color: var(--color-ink);
}

.post-body h2 {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-ink);
  margin: 52px 0 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-don);
}
.post-body h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-ink);
  margin: 36px 0 14px;
  padding-left: 14px;
  border-left: 3px solid var(--color-accent);
}
.post-body h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-muted);
  margin: 28px 0 10px;
}

.post-body p {
  margin-bottom: 22px;
}
.post-body strong { font-weight: 700; color: var(--color-ink); }
.post-body em { font-style: italic; color: var(--color-muted); }

.post-body a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.post-body a:hover { color: var(--color-don); }

.post-body ul,
.post-body ol {
  margin: 16px 0 24px 1.5em;
}
.post-body li { margin-bottom: 8px; }

.post-body blockquote {
  margin: 28px 0;
  padding: 18px 22px;
  border-left: 4px solid var(--color-don);
  background: var(--color-cream);
  font-size: 15px;
  color: var(--color-muted);
  font-style: italic;
  border-radius: 0 4px 4px 0;
}

.post-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 14px;
  overflow-x: auto;
  display: block;
}
.post-body thead th {
  background: var(--color-cream);
  font-weight: 700;
  padding: 10px 16px;
  text-align: left;
  border: 1px solid var(--color-rule);
  white-space: nowrap;
}
.post-body tbody td {
  padding: 10px 16px;
  border: 1px solid var(--color-rule);
  vertical-align: top;
}
.post-body tbody tr:nth-child(even) { background: rgba(240, 230, 208, 0.3); }

.post-body code {
  font-family: 'Courier New', Courier, monospace;
  font-size: 14px;
  background: var(--color-cream);
  padding: 2px 6px;
  border-radius: 3px;
  border: 1px solid var(--color-rule);
}
.post-body pre {
  background: var(--color-ink);
  color: var(--color-paper);
  padding: 20px 22px;
  border-radius: 6px;
  overflow-x: auto;
  margin: 24px 0;
  font-size: 14px;
  line-height: 1.6;
}
.post-body pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

.post-body hr {
  border: none;
  border-top: 1px solid var(--color-rule);
  margin: 48px 0;
}

/* 読了時間 */
.post-readtime {
  font-size: 12px;
  color: var(--color-muted);
  letter-spacing: 0.04em;
}
.post-readtime::before {
  content: '📖 ';
}

/* ── 目次（折りたたみ式） ──────────────────────────── */
.toc {
  margin: 32px 0 40px;
  background: var(--color-white);
  border: 1px solid var(--color-rule);
  border-left: 4px solid var(--color-don);
  border-radius: 0 6px 6px 0;
  padding: 0;
  overflow: hidden;
}
.toc[open] { padding-bottom: 20px; }

.toc-title {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 20px;
  font-size: 14px;
  font-weight: 700;
  color: var(--color-ink);
  cursor: pointer;
  user-select: none;
  letter-spacing: 0.04em;
  list-style: none; /* Safariのデフォルト矢印を除去 */
}
.toc-title::-webkit-details-marker { display: none; }
.toc-title::before {
  content: '≡';
  color: var(--color-don);
  font-size: 16px;
}
.toc-title::after {
  content: '▼';
  font-size: 10px;
  color: var(--color-muted);
  margin-left: auto;
  transition: transform 0.2s;
}
.toc[open] .toc-title::after { transform: rotate(-180deg); }

.toc-list {
  list-style: none;
  counter-reset: toc-counter;
  padding: 0 20px 0 20px;
  margin: 0;
}
.toc-list li {
  counter-increment: toc-counter;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 6px 0;
  border-bottom: 1px solid var(--color-cream);
  font-size: 13px;
  line-height: 1.5;
}
.toc-list li:last-child { border-bottom: none; }
.toc-list li::before {
  content: counter(toc-counter) '.';
  color: var(--color-don);
  font-weight: 700;
  font-size: 12px;
  min-width: 18px;
  flex-shrink: 0;
}
.toc-list li a {
  color: var(--color-ink);
  text-decoration: none;
  transition: color 0.2s;
  flex: 1;
}
.toc-list li a:hover { color: var(--color-accent); }
/* h3（サブ見出し）はインデント */
.toc-list li.toc-h3 {
  padding-left: 20px;
  font-size: 12px;
  color: var(--color-muted);
}
.toc-list li.toc-h3::before {
  content: '–';
  color: var(--color-rule);
  font-weight: 400;
}

/* 更新日 */
.post-updated {
  font-size: 12px;
  color: var(--color-muted);
  letter-spacing: 0.04em;
}

/* ── 著者情報ボックス ──────────────────────────────── */
.author-box {
  margin-top: 56px;
  padding: 26px 30px;
  background: var(--color-cream);
  border: 1px solid var(--color-rule);
  border-left: 4px solid var(--color-don);
  border-radius: 0 6px 6px 0;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
}
.author-box-body { flex: 1; }
.author-box-name {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: 4px;
}
.author-box-role {
  font-size: 11px;
  color: var(--color-muted);
  letter-spacing: 0.04em;
  margin-bottom: 10px;
}
.author-box-desc {
  font-size: 14px;
  color: var(--color-ink);
  line-height: 1.75;
}
.author-box-note {
  font-size: 13px;
  color: var(--color-muted);
  margin-top: 8px;
  font-style: italic;
}
.author-box-cta {
  display: inline-block;
  flex-shrink: 0;
  padding: 10px 20px;
  background: var(--color-accent2);
  color: var(--color-white) !important;
  font-size: 13px;
  font-weight: 700;
  border-radius: 2px;
  white-space: nowrap;
  transition: background 0.2s;
}
.author-box-cta:hover { background: var(--color-ink); }

/* 戻るリンク */
.post-back {
  margin-top: 56px;
  padding-top: 28px;
  border-top: 1px solid var(--color-rule);
}
.post-back a {
  font-size: 14px;
  color: var(--color-accent);
  letter-spacing: 0.04em;
  transition: color 0.2s;
}
.post-back a:hover { color: var(--color-don); }

/* ── レスポンシブ ──────────────────────────────────── */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
}
@media (max-width: 640px) {
  .nav-inner   { padding: 0 16px; }
  .blog-main   { padding: 40px 16px 32px; }
  .post-main   { padding: 40px 16px 32px; }
  .card-grid   { grid-template-columns: 1fr; gap: 18px; }
  .post-body h2 { font-size: 20px; }
  .post-body h3 { font-size: 17px; }
  .post-body table { font-size: 13px; }
  .pager { gap: 14px; }
  .pager-prev, .pager-next { padding: 8px 16px; font-size: 13px; }
  /* パンくず */
  .breadcrumb { padding: 14px 16px 0; }
  .breadcrumb li[aria-current="page"] { max-width: 180px; }
  /* 著者情報ボックス */
  .author-box { flex-direction: column; gap: 16px; padding: 20px 20px; }
  .author-box-cta { align-self: flex-start; }
}

/* ══════════════════════════════════════════════════════
   タグ一覧ページ
══════════════════════════════════════════════════════ */
.tag-index-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}
.tag-index-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: var(--color-white);
  border: 1px solid var(--color-rule);
  border-radius: 100px;
  transition: all 0.2s;
  text-decoration: none;
}
.tag-index-item:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-white);
}
.tag-index-name {
  font-size: 14px;
  color: inherit;
  letter-spacing: 0.02em;
}
.tag-index-count {
  font-size: 11px;
  color: var(--color-muted);
  background: var(--color-cream);
  padding: 2px 7px;
  border-radius: 100px;
  font-weight: 700;
  min-width: 22px;
  text-align: center;
  transition: color 0.2s, background 0.2s;
}
.tag-index-item:hover .tag-index-count {
  background: rgba(255,255,255,0.2);
  color: var(--color-white);
}
.tag-page-count {
  font-size: 16px;
  color: var(--color-muted);
  font-family: var(--font-sans);
  font-weight: 400;
  margin-left: 8px;
}
.tag-page-back {
  margin-top: 40px;
}
.tag-page-back a {
  font-size: 14px;
  color: var(--color-accent);
  transition: color 0.2s;
}
.tag-page-back a:hover { color: var(--color-don); }
.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}

/* ══════════════════════════════════════════════════════
   検索ページ
══════════════════════════════════════════════════════ */
.search-bar {
  margin-bottom: 36px;
}
.search-bar input {
  width: 100%;
  padding: 14px 20px;
  font-size: 16px;
  font-family: var(--font-sans);
  border: 2px solid var(--color-rule);
  border-radius: 6px;
  background: var(--color-white);
  color: var(--color-ink);
  outline: none;
  transition: border-color 0.2s;
}
.search-bar input:focus {
  border-color: var(--color-don);
}
.search-bar input::placeholder {
  color: var(--color-muted);
  font-size: 14px;
}
.search-empty {
  text-align: center;
  color: var(--color-muted);
  font-size: 15px;
  padding: 40px 0;
}

@media (prefers-reduced-motion: reduce) {
  .card { transition: none; }
  .card:hover { transform: none; }
}