/* ============================================================
   にほんご友 — mockup_v2 共通スタイル
   既存 web/public_html/assets/style.css を踏襲し、
   記事系コンポーネント（ナビ・記事カード・本文・パンくず・関連）を追加。
   デザイン指針は /DESIGN.md 準拠。
   ============================================================ */

:root {
  --color-bg: #f7f6f2;
  --color-bg-alt: #f0efea;
  --color-bg-deep: #ebeae5; /* 関連エリアなど一段沈めた背景 */
  --color-text: #333;
  --color-border: #e2e2e2;
  --color-border-soft: #ecebe6;
  --color-accent: #626035;
  --color-highlight: #d8c3c3;
  --color-muted: rgb(51 51 51 / 70%);
  --font-display: 'Noto Serif JP', serif;
  --font-body: 'BIZ UDPGothic', 'Noto Sans JP', sans-serif;
  --font-utility: 'Noto Sans JP', sans-serif;
  --transition: 0.4s ease;
  --container: 720px; /* サイト共通の 1 カラム最大幅 */
}

/* -------- リセット -------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  text-size-adjust: 100%;
  font-size: 16px;
  scroll-behavior: smooth;
}
a {
  color: inherit;
  text-decoration: none;
}
button {
  font: inherit;
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
}
ul,
ol {
  list-style: none;
}
img {
  max-width: 100%;
  height: auto;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.85;
  letter-spacing: 0.06em;
  min-height: 100vh;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 200 200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/></filter><rect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/></svg>");
}

/* -------- コンテナ --------
   .site 自身は幅を持たない外枠。ヘッダ／コンテンツ／フッタは
   それぞれ 720px に固定され、左右中央で揃う。
   -------------------------------------------------------------- */
.site {
  margin: 0 auto;
  position: relative;
}
.site-content {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
}

/* -------- ヘッダ（常に 720px 幅） -------- */
.site-header {
  max-width: var(--container);
  margin: 0 auto;
  padding: 24px 28px;
  border-bottom: 1px solid var(--color-border);
  position: relative; /* モバイル時のナビポップアップの基点 */
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 28px;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.05rem;
  letter-spacing: 0.22em;
}
.site-brand-mark {
  display: block;
  width: 32px;
  height: 32px;
}

/* メインナビ */
.site-nav-main {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
}
.site-nav-main a {
  position: relative;
  font-family: var(--font-utility);
  font-weight: 500;
  font-size: 0.78rem;
  letter-spacing: 0.28em;
  color: var(--color-muted);
  padding: 6px 0;
  transition: color var(--transition);
}
.site-nav-main a::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 0;
  height: 1px;
  background: var(--color-accent);
  transition:
    width var(--transition),
    left var(--transition);
}
.site-nav-main a:hover,
.site-nav-main a[aria-current='page'] {
  color: var(--color-accent);
}
.site-nav-main a:hover::after,
.site-nav-main a[aria-current='page']::after {
  width: 100%;
  left: 0;
}

/* 言語切替 */
.site-nav-lang {
  position: relative;
}
.site-lang-toggle {
  padding: 8px 14px;
  padding-right: 24px;
  border: 1px solid var(--color-border);
  border-radius: 2px;
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  color: var(--color-muted);
  transition:
    border-color var(--transition),
    color var(--transition);
  position: relative;
  min-width: 120px;
  text-align: left;
}
.site-lang-toggle::after {
  content: '▾';
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.7rem;
}
.site-lang-toggle:hover,
.site-lang-toggle[aria-expanded='true'] {
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.site-lang-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 220px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  padding: 4px 0;
  z-index: 20;
  animation: fade-up 0.3s ease;
}
.site-lang-menu .lang-item {
  padding: 10px 18px;
  font-size: 0.86rem;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition:
    background var(--transition),
    color var(--transition);
}
.site-lang-menu .lang-item:hover {
  background: var(--color-highlight);
}
.site-lang-menu .lang-item.active {
  color: var(--color-accent);
  background: var(--color-bg-alt);
}

/* モバイルメニュー（チェックボックスなし、JS で開閉） */
.site-nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--color-border);
  border-radius: 2px;
  align-items: center;
  justify-content: center;
}
.site-nav-toggle .bar {
  display: block;
  width: 16px;
  height: 1px;
  background: var(--color-text);
  position: relative;
}
.site-nav-toggle .bar::before,
.site-nav-toggle .bar::after {
  content: '';
  position: absolute;
  left: 0;
  width: 16px;
  height: 1px;
  background: var(--color-text);
}
.site-nav-toggle .bar::before {
  top: -5px;
}
.site-nav-toggle .bar::after {
  top: 5px;
}

/* -------- アニメーション -------- */
@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* -------- ヒーロー（トップ） -------- */
.hero {
  padding: 96px 0 64px;
  display: flex;
  align-items: center;
  gap: 40px;
  opacity: 0;
  animation: fade-up 1s ease 0.05s forwards;
}
.hero-mark {
  display: block;
  width: 140px;
  height: 140px;
  flex-shrink: 0;
}
.hero-text {
  flex: 1;
  min-width: 0;
}
.hero-kicker {
  font-family: var(--font-utility);
  font-size: 0.72rem;
  color: var(--color-muted);
  letter-spacing: 0.35em;
  margin-bottom: 20px;
}
.hero-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 2.1rem;
  line-height: 1.65;
  letter-spacing: 0.08em;
  margin-bottom: 22px;
}
.hero-sub {
  font-size: 0.95rem;
  color: var(--color-muted);
  line-height: 1.95;
  max-width: 560px;
}

/* -------- セクション共通 -------- */
.section {
  padding: 72px 0;
  border-top: 1px solid var(--color-border);
  opacity: 0;
  animation: fade-up 0.9s ease forwards;
}
.section--first {
  border-top: none;
}
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}
.section-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.3rem;
  letter-spacing: 0.18em;
  margin-bottom: 16px;
}
.section-head .section-title {
  margin-bottom: 0;
}
.section-link {
  font-family: var(--font-utility);
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  color: var(--color-accent);
  white-space: nowrap;
  transition: opacity var(--transition);
}
.section-link:hover {
  opacity: 0.7;
}
.section-desc {
  font-size: 0.88rem;
  color: var(--color-muted);
  line-height: 1.9;
  margin-bottom: 40px;
  max-width: 560px;
}

/* -------- コンテンツカード（学びの道具） -------- */
.content-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.content-card {
  display: block;
  padding: 32px 28px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 2px;
  transition:
    border-color var(--transition),
    background var(--transition);
}
.content-card:hover {
  border-color: var(--color-accent);
  background: var(--color-bg);
}
.content-card-label {
  font-family: var(--font-utility);
  font-size: 0.7rem;
  color: var(--color-muted);
  letter-spacing: 0.3em;
  margin-bottom: 14px;
}
.content-card-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.35rem;
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}
.content-card-desc {
  font-size: 0.88rem;
  color: var(--color-muted);
  line-height: 1.95;
  margin-bottom: 18px;
}
.content-card-cta {
  font-size: 0.85rem;
  color: var(--color-accent);
  letter-spacing: 0.2em;
}

/* ============================================================
   ↓ mockup_v2 で追加した記事系コンポーネント
   ============================================================ */

/* -------- パンくず -------- */
.breadcrumb {
  font-family: var(--font-utility);
  font-size: 0.74rem;
  letter-spacing: 0.2em;
  color: var(--color-muted);
  padding: 28px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.breadcrumb a {
  color: var(--color-muted);
  transition: color var(--transition);
}
.breadcrumb a:hover {
  color: var(--color-accent);
}
.breadcrumb .sep {
  color: var(--color-border);
}
.breadcrumb [aria-current='page'] {
  color: var(--color-text);
}

/* -------- 記事インデックス（特集） -------- */
.featured {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 0;
  border: 1px solid var(--color-border);
  border-radius: 2px;
  background: var(--color-bg-alt);
  margin-bottom: 56px;
  overflow: hidden;
  transition:
    border-color var(--transition),
    background var(--transition);
}
.featured:hover {
  border-color: var(--color-accent);
  background: var(--color-bg);
}
.featured-thumb {
  background: var(--color-bg-deep);
  border-right: 1px solid var(--color-border-soft);
  position: relative;
  min-height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.featured-thumb::before {
  content: '';
  position: absolute;
  inset: 24px;
  border: 0.5px solid var(--color-border);
}
.featured-thumb-jp {
  font-family: var(--font-display);
  font-size: 4.2rem;
  letter-spacing: 0.2em;
  color: rgb(98 96 53 / 18%);
  writing-mode: vertical-rl;
  user-select: none;
}
.featured-body {
  padding: 40px 36px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.featured-kicker {
  font-family: var(--font-utility);
  font-size: 0.7rem;
  letter-spacing: 0.32em;
  color: var(--color-accent);
  margin-bottom: 12px;
}
.featured-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.55rem;
  line-height: 1.65;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}
.featured-lead {
  font-size: 0.9rem;
  color: var(--color-muted);
  line-height: 1.95;
  margin-bottom: 22px;
}
.featured-meta {
  display: flex;
  gap: 14px;
  font-family: var(--font-utility);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--color-muted);
}

/* -------- 記事グリッド -------- */
.article-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}
.article-grid--single {
  grid-template-columns: 1fr;
}

/* 記事カード */
.article-card {
  display: flex;
  flex-direction: column;
  padding: 26px 24px 24px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 2px;
  transition:
    border-color var(--transition),
    background var(--transition);
}
.article-card:hover {
  border-color: var(--color-accent);
  background: var(--color-bg);
}
.article-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
  font-family: var(--font-utility);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  color: var(--color-muted);
}
.article-card-cat {
  color: var(--color-accent);
}
.article-card-dot {
  color: var(--color-border);
}
.article-card-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.1rem;
  line-height: 1.7;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}
.article-card-lead {
  font-size: 0.84rem;
  color: var(--color-muted);
  line-height: 1.9;
  margin-bottom: 18px;
}
.article-card-cta {
  margin-top: auto;
  font-family: var(--font-utility);
  font-size: 0.76rem;
  letter-spacing: 0.22em;
  color: var(--color-accent);
}

/* 記事カード（横長：カテゴリ一覧用） */
.article-row {
  display: grid;
  grid-template-columns: 80px 1fr auto;
  align-items: baseline;
  gap: 24px;
  padding: 26px 4px;
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition);
}
.article-row:hover {
  background: var(--color-bg-alt);
}
.article-row-no {
  font-family: var(--font-utility);
  font-size: 0.7rem;
  letter-spacing: 0.28em;
  color: var(--color-muted);
}
.article-row-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  line-height: 1.6;
}
.article-row-meta {
  font-family: var(--font-utility);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  color: var(--color-muted);
  white-space: nowrap;
}

/* -------- カテゴリ一覧（読みものトップ） -------- */
.category-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border-top: 1px solid var(--color-border);
  border-left: 1px solid var(--color-border);
}
.category-cell {
  display: block;
  padding: 32px 28px;
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
  transition: background var(--transition);
}
.category-cell:hover {
  background: var(--color-bg-alt);
}
.category-cell-no {
  font-family: var(--font-utility);
  font-size: 0.72rem;
  letter-spacing: 0.32em;
  color: var(--color-muted);
  margin-bottom: 14px;
}
.category-cell-name {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.3rem;
  letter-spacing: 0.16em;
  margin-bottom: 8px;
}
.category-cell-name-en {
  font-family: var(--font-utility);
  font-size: 0.72rem;
  letter-spacing: 0.3em;
  color: var(--color-muted);
  margin-bottom: 14px;
}
.category-cell-desc {
  font-size: 0.84rem;
  color: var(--color-muted);
  line-height: 1.9;
  margin-bottom: 14px;
}
.category-cell-count {
  font-family: var(--font-utility);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  color: var(--color-accent);
}

/* -------- カテゴリヘッド（カテゴリページ） -------- */
.category-head {
  padding: 64px 0 40px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 36px;
  align-items: start;
  border-bottom: 1px solid var(--color-border);
}
.category-head-vertical {
  writing-mode: vertical-rl;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: 0.45em;
  color: var(--color-muted);
  padding-left: 12px;
  border-left: 1px solid var(--color-border);
  min-height: 140px;
}
.category-head-no {
  font-family: var(--font-utility);
  font-size: 0.72rem;
  letter-spacing: 0.32em;
  color: var(--color-muted);
  margin-bottom: 14px;
}
.category-head-name {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.9rem;
  letter-spacing: 0.12em;
  margin-bottom: 14px;
}
.category-head-desc {
  font-size: 0.92rem;
  color: var(--color-muted);
  line-height: 1.95;
  max-width: 560px;
}

/* カテゴリページのチップ・タグナビ */
.category-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 28px 0 36px;
}
.tag-chip {
  font-family: var(--font-utility);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--color-muted);
  padding: 6px 14px;
  border: 1px solid var(--color-border);
  border-radius: 2px;
  transition:
    border-color var(--transition),
    color var(--transition);
}
.tag-chip:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.tag-chip.active {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* -------- 記事詳細 -------- */
.article {
  padding: 56px 0 96px;
}
.article-header {
  margin-bottom: 56px;
  padding-bottom: 36px;
  border-bottom: 1px solid var(--color-border);
}
.article-cat {
  display: inline-block;
  font-family: var(--font-utility);
  font-size: 0.74rem;
  letter-spacing: 0.28em;
  color: var(--color-accent);
  margin-bottom: 22px;
}
.article-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 2.1rem;
  line-height: 1.6;
  letter-spacing: 0.08em;
  margin-bottom: 24px;
}
.article-meta {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  font-family: var(--font-utility);
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  color: var(--color-muted);
}
.article-meta .sep {
  color: var(--color-border);
}

/* 記事本文タイポグラフィ */
.article-body {
  font-size: 1rem;
  line-height: 2.05;
  letter-spacing: 0.06em;
}
.article-body > * + * {
  margin-top: 1.4em;
}
.article-body h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.35rem;
  line-height: 1.7;
  letter-spacing: 0.1em;
  margin-top: 2.6em;
  margin-bottom: 0.6em;
  padding-top: 1.4em;
  border-top: 1px solid var(--color-border-soft);
}
.article-body h3 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.08rem;
  letter-spacing: 0.1em;
  margin-top: 2em;
  margin-bottom: 0.4em;
}
.article-body p {
  font-family: var(--font-body);
}
.article-body a {
  color: var(--color-accent);
  border-bottom: 0.5px solid var(--color-accent);
  transition: opacity var(--transition);
}
.article-body a:hover {
  opacity: 0.7;
}
.article-body ul,
.article-body ol {
  padding-left: 1.4em;
  list-style: revert;
}
.article-body li + li {
  margin-top: 0.4em;
}
.article-body blockquote {
  padding: 4px 22px;
  border-left: 1px solid var(--color-accent);
  color: var(--color-muted);
  font-family: var(--font-display);
  font-size: 0.98rem;
}
.article-body figure {
  margin-top: 2em;
  margin-bottom: 2em;
}
.article-body figcaption {
  margin-top: 10px;
  font-family: var(--font-utility);
  font-size: 0.74rem;
  color: var(--color-muted);
  letter-spacing: 0.18em;
  text-align: center;
}
.article-body .pull {
  font-family: var(--font-display);
  font-size: 1.2rem;
  line-height: 1.85;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  padding: 1.2em 0;
  border-top: 0.5px solid var(--color-border);
  border-bottom: 0.5px solid var(--color-border);
}
.article-body ruby rt {
  font-family: var(--font-utility);
  font-size: 0.625rem;
  color: var(--color-muted);
  font-weight: 500;
}
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.6em 0;
  font-size: 0.95rem;
  font-family: var(--font-body);
}
.article-body th,
.article-body td {
  padding: 12px 14px;
  border: 0.5px solid var(--color-border);
  text-align: left;
  vertical-align: top;
  line-height: 1.7;
}
.article-body thead th {
  background: var(--color-bg-alt);
  font-family: var(--font-utility);
  font-weight: 500;
  letter-spacing: 0.04em;
  font-size: 0.85rem;
  color: var(--color-muted);
  text-transform: uppercase;
}
.article-body tbody tr:nth-child(even) {
  background: rgb(0 0 0 / 1.5%);
}

@media (width <= 720px) {
  .article-body table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}

/* TL;DR（記事冒頭の要点ボックス） */
.article-tldr {
  margin: 0 0 56px;
  padding: 24px 28px;
  background: var(--color-bg-alt);
  border-left: 2px solid var(--color-accent);
  border-radius: 2px;
}
.article-tldr-label {
  font-family: var(--font-utility);
  font-size: 0.72rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 10px;
}
.article-tldr-body {
  font-family: var(--font-body);
  font-size: 0.98rem;
  line-height: 1.95;
  letter-spacing: 0.05em;
  color: var(--color-text);
  margin: 0;
}

/* HowTo 概要（学び方カテゴリの全体ロードマップ） */
.article-howto {
  margin: 0 0 64px;
  padding: 32px 32px 28px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 2px;
}
.article-howto-heading {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.1rem;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin: 0 0 18px;
}
.article-howto-steps {
  list-style: none;
  padding-left: 0;
  margin: 0;
  counter-reset: howto-step;
}
.article-howto-step {
  position: relative;
  padding: 16px 0 16px 44px;
  border-top: 0.5px solid var(--color-border);
  counter-increment: howto-step;
}
.article-howto-step:first-child {
  border-top: 0;
}
.article-howto-step::before {
  content: counter(howto-step, decimal-leading-zero);
  position: absolute;
  top: 18px;
  left: 0;
  font-family: var(--font-utility);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  color: var(--color-muted);
}
.article-howto-step-name {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1rem;
  line-height: 1.65;
  letter-spacing: 0.08em;
  margin: 0 0 6px;
}
.article-howto-step-text {
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.9;
  letter-spacing: 0.05em;
  color: var(--color-muted);
  margin: 0;
}

/* FAQ（記事末尾、関連エリアの直前） */
.article-faq {
  margin-top: 80px;
  padding-top: 48px;
  border-top: 1px solid var(--color-border);
}
.article-faq-heading {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.25rem;
  letter-spacing: 0.1em;
  margin: 0 0 28px;
}
.article-faq-list {
  margin: 0;
  padding: 0;
}
.article-faq-q {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.02rem;
  line-height: 1.75;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin: 28px 0 8px;
  padding-top: 24px;
  border-top: 0.5px solid var(--color-border);
}
.article-faq-q:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}
.article-faq-a {
  font-family: var(--font-body);
  font-size: 0.98rem;
  line-height: 2;
  letter-spacing: 0.05em;
  color: var(--color-text);
  margin: 0 0 4px;
  padding-left: 0;
}

/* 関連エリア（記事末尾） */
.related {
  margin-top: 96px;
  padding-top: 56px;
  border-top: 1px solid var(--color-border);
}
.related-head {
  font-family: var(--font-utility);
  font-size: 0.74rem;
  letter-spacing: 0.32em;
  color: var(--color-muted);
  margin-bottom: 24px;
}
.related-tools {
  margin-top: 56px;
  padding: 28px;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 2px;
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 24px;
  transition:
    border-color var(--transition),
    background var(--transition);
}
.related-tools:hover {
  border-color: var(--color-accent);
  background: var(--color-bg);
}
.related-tools-label {
  font-family: var(--font-utility);
  font-size: 0.7rem;
  letter-spacing: 0.3em;
  color: var(--color-muted);
  margin-bottom: 8px;
}
.related-tools-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.1rem;
  letter-spacing: 0.1em;
  margin-bottom: 4px;
}
.related-tools-desc {
  font-size: 0.84rem;
  color: var(--color-muted);
  line-height: 1.85;
}
.related-tools-cta {
  font-family: var(--font-utility);
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  color: var(--color-accent);
}

/* -------- ページネーション -------- */
.pagination {
  display: flex;
  justify-content: center;
  gap: 4px;
  padding: 56px 0 0;
}
.pagination a,
.pagination span {
  min-width: 38px;
  height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-utility);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--color-muted);
  border: 1px solid transparent;
  border-radius: 2px;
  transition:
    border-color var(--transition),
    color var(--transition);
}
.pagination a:hover {
  border-color: var(--color-border);
  color: var(--color-accent);
}
.pagination .current {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* -------- About（縦書きアクセント） -------- */
.about {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 36px;
  align-items: start;
}
.about-vertical {
  writing-mode: vertical-rl;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: 0.45em;
  color: var(--color-muted);
  padding-left: 12px;
  border-left: 1px solid var(--color-border);
  min-height: 140px;
}
.about-main .section-title {
  margin-bottom: 20px;
}
.about-body {
  font-size: 0.95rem;
  color: var(--color-text);
  line-height: 2.05;
}

/* -------- Coming リスト（互換） -------- */
.coming-list {
  border-top: 1px solid var(--color-border);
}
.coming-item {
  display: grid;
  grid-template-columns: 44px 1fr auto;
  align-items: baseline;
  gap: 16px;
  padding: 22px 4px;
  border-bottom: 1px solid var(--color-border);
}
.coming-label {
  font-family: var(--font-utility);
  font-size: 0.72rem;
  color: var(--color-muted);
  letter-spacing: 0.25em;
}
.coming-name {
  font-family: var(--font-display);
  font-size: 1.05rem;
  letter-spacing: 0.1em;
}
.coming-status {
  font-family: var(--font-utility);
  font-size: 0.7rem;
  color: var(--color-muted);
  letter-spacing: 0.25em;
}

/* -------- フッター（ヘッダと揃えて常に 720px 幅） -------- */
.site-footer {
  max-width: var(--container);
  margin: 0 auto;
  padding: 72px 28px 48px;
  border-top: 1px solid var(--color-border);
  text-align: center;
}
.site-footer-mark {
  display: block;
  width: 48px;
  height: 48px;
  margin: 0 auto 14px;
}
.site-footer-brand {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1rem;
  letter-spacing: 0.35em;
  margin-bottom: 10px;
}
.site-footer-note {
  font-size: 0.8rem;
  color: var(--color-muted);
  margin-bottom: 22px;
  line-height: 1.9;
}
.site-footer-copy {
  font-family: var(--font-utility);
  font-size: 0.68rem;
  color: var(--color-muted);
  letter-spacing: 0.3em;
}
.site-footer-nav {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 22px;
  font-family: var(--font-utility);
  font-size: 0.74rem;
  letter-spacing: 0.24em;
}
.site-footer-nav a {
  color: var(--color-muted);
  transition: color var(--transition);
}
.site-footer-nav a:hover {
  color: var(--color-accent);
}

/* -------- ルビ -------- */
ruby rt {
  font-family: var(--font-utility);
  font-size: 0.625rem;
  color: var(--color-muted);
  font-weight: 500;
}

/* ============================================================
   レスポンシブ
   ============================================================ */

/* タブレット（〜 880px） */
@media (width <= 880px) {
  .featured {
    grid-template-columns: 1fr;
  }
  .featured-thumb {
    min-height: 180px;
    border-right: none;
    border-bottom: 1px solid var(--color-border-soft);
  }
  .featured-thumb-jp {
    font-size: 3rem;
  }
  .featured-body {
    padding: 32px 28px;
  }
  .article-grid {
    grid-template-columns: 1fr;
  }
  .category-grid {
    grid-template-columns: 1fr;
    border-left: none;
  }
  .category-cell {
    border-right: none;
  }
  .article-row {
    grid-template-columns: 60px 1fr;
    gap: 16px;
  }
  .article-row-meta {
    grid-column: 2;
    margin-top: 4px;
  }
}

/* モバイル（〜 600px） */
@media (width <= 600px) {
  .site-content {
    padding-left: 22px;
    padding-right: 22px;
  }

  /* ヘッダー：ナビをトグル化 */
  .site-header {
    grid-template-columns: auto 1fr auto;
    gap: 12px;
    padding: 18px 22px;
  }
  .site-brand {
    font-size: 0.95rem;
    letter-spacing: 0.2em;
    gap: 10px;
  }
  .site-brand-mark {
    width: 28px;
    height: 28px;
  }
  .site-nav-main {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    padding: 8px 22px;
    z-index: 15;
    animation: fade-up 0.3s ease;
  }
  .site-nav-main[data-open='1'] {
    display: flex;
  }
  .site-nav-main a {
    padding: 14px 0;
    border-bottom: 1px solid var(--color-border-soft);
    width: 100%;
  }
  .site-nav-main a:last-child {
    border-bottom: none;
  }
  .site-nav-toggle {
    display: inline-flex;
  }
  .site-lang-toggle {
    min-width: 96px;
    font-size: 0.7rem;
    padding: 6px 22px 6px 10px;
  }

  .hero {
    padding: 56px 0 36px;
    gap: 20px;
  }
  .hero-mark {
    width: 76px;
    height: 76px;
  }
  .hero-title {
    font-size: 1.55rem;
    line-height: 1.7;
  }
  .hero-sub {
    font-size: 0.88rem;
  }

  .section {
    padding: 56px 0;
  }
  .section-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  .section-title {
    font-size: 1.1rem;
  }
  .section-desc {
    margin-bottom: 28px;
  }

  .content-card {
    padding: 26px 22px;
  }
  .content-card-title {
    font-size: 1.15rem;
  }

  .article-card {
    padding: 22px 20px;
  }

  .category-head {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 40px 0 28px;
  }
  .category-head-vertical {
    display: none;
  }
  .category-head-name {
    font-size: 1.5rem;
  }

  .article-title {
    font-size: 1.55rem;
  }
  .article-body h2 {
    font-size: 1.15rem;
  }
  .article-body .pull {
    font-size: 1.05rem;
  }

  .related-tools {
    grid-template-columns: 1fr;
  }

  .about {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .about-vertical {
    display: none;
  }

  .site-footer {
    padding: 56px 22px 36px;
  }
}

/* ============================================================
   ビルダー由来の追加コンポーネント（Phase F）
   ============================================================ */

/* セクション末尾の小さな CTA リンク */
.section-cta {
  margin-top: 28px;
  text-align: right;
}
.ghost-link {
  display: inline-block;
  font-family: var(--font-utility);
  font-size: 0.875rem;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: var(--transition);
}
.ghost-link:hover {
  border-bottom-color: var(--color-accent);
  color: var(--color-highlight);
}

/* hero のバリアント */
.hero--about,
.hero--category {
  padding-top: 24px;
}

/* 翻訳が未完成のカードのトーンをわずかに落とす */
.article-card--pending {
  position: relative;
}
.article-card-pending {
  font-family: var(--font-utility);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--color-muted);
  border: 0.5px solid var(--color-border);
  padding: 1px 6px;
  border-radius: 2px;
}

/* about ページの記事本体（記事系コンポーネントを流用） */
.about-article {
  padding-top: 16px;
}