/*==================================
 * article.css - ecoledefx.xyz 記事ページ専用
 * lp.css のCSS変数を継承、ヘッダー/パンくずはブログUIと統一
 * 更新日: 2026-02-25
 *==================================*/

/* 1. ヘッダー（ブログUI統一）
 *==================================*/
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: #fff;
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height-sp);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 16px;
  max-width: 1200px;
  margin: 0 auto;
}
.site-brand {
  display: flex;
  align-items: baseline;
  gap: 6px;
  text-decoration: none;
  color: var(--color-text);
}
.site-brand:hover { text-decoration: none; }
.brand-name {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .02em;
}
.brand-since {
  font-size: 10px;
  color: var(--color-text-light);
}

/* nav toggle (override lp.css) */
.site-header .nav-toggle-label {
  display: flex;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.site-header .nav-toggle-label span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  transition: transform .2s, opacity .2s;
}
.nav-toggle:checked ~ .header-inner .nav-toggle-label span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle:checked ~ .header-inner .nav-toggle-label span:nth-child(2) {
  opacity: 0;
}
.nav-toggle:checked ~ .header-inner .nav-toggle-label span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-header .header-nav {
  position: absolute;
  top: var(--header-height-sp);
  left: 0; right: 0;
  background: #fff;
  border-bottom: 1px solid var(--color-border);
  max-height: 0;
  overflow: hidden;
  transition: max-height .3s ease;
  box-shadow: none;
}
.nav-toggle:checked ~ .header-nav {
  max-height: 400px;
}
.site-header .header-nav ul {
  padding: 8px 0;
  display: flex;
  flex-direction: column;
}
.site-header .header-nav li a {
  display: block;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  text-align: right;
  text-decoration: none;
  border-bottom: none;
  transition: background .2s;
}
.site-header .header-nav li a:hover {
  background: var(--color-bg-light);
  text-decoration: none;
}

@media (min-width: 768px) {
  .site-header { height: auto; }
  .header-inner { height: var(--header-height); padding: 0 24px; }
  .brand-name { font-size: 18px; }
  .brand-since { font-size: 11px; }
  .site-header .nav-toggle-label { display: none; }
  .site-header .header-nav {
    position: static;
    max-height: none;
    border-bottom: none;
    overflow: visible;
    box-shadow: none;
  }
  .site-header .header-nav ul {
    flex-direction: row;
    justify-content: center;
    gap: 4px;
    padding: 0;
  }
  .site-header .header-nav li a {
    padding: 6px 12px;
    font-size: 13px;
    border-radius: 4px;
    text-align: center;
  }
}

/* 2. パンくずリスト
 *==================================*/
.breadcrumb {
  position: fixed;
  top: var(--header-height-sp);
  left: 0; right: 0;
  z-index: 999;
  padding: 7px 16px;
  font-size: 12px;
  color: var(--color-text-light);
  background: #f8fafc;
  border-bottom: 1px solid var(--color-border);
  overflow: hidden;
}
.breadcrumb ol {
  display: flex;
  flex-wrap: nowrap;
  gap: 4px;
  max-width: 1200px;
  margin: 0 auto;
  list-style: none;
}
.breadcrumb li {
  white-space: nowrap;
  flex-shrink: 0;
}
.breadcrumb li::after {
  content: '>';
  margin-left: 4px;
  color: #ccc;
}
.breadcrumb li:last-child {
  flex-shrink: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}
.breadcrumb li:last-child::after { content: ''; margin-left: 0; }
.breadcrumb a {
  color: var(--color-link-sp);
  text-decoration: none;
}
.breadcrumb a:hover { text-decoration: underline; }

@media (min-width: 768px) {
  .breadcrumb {
    top: calc(var(--header-height) + 34px);
    padding: 8px 24px;
    font-size: 13px;
  }
  .breadcrumb a { color: var(--color-link); }
}

/* 3. 記事レイアウト
 *==================================*/
.article-main {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 16px 40px;
  padding-top: calc(var(--header-height-sp) + 34px);
  overflow-x: hidden;
  min-width: 0;
  width: 100%;
}

@media (min-width: 768px) {
  .article-main { padding: 0 24px 60px; padding-top: calc(var(--header-height) + 34px + 30px); }
}

/* 3. 記事ヘッダー
 *==================================*/
.article-header {
  padding: 24px 0 20px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 24px;
}
.article-meta {
  font-size: 12px;
  color: var(--color-text-light);
  margin-bottom: 12px;
}
.article-header h1 {
  font-size: 22px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--color-text);
  margin-bottom: 12px;
}
.article-lead {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.7;
}

@media (min-width: 768px) {
  .article-header { padding: 32px 0 24px; }
  .article-header h1 { font-size: 28px; }
  .article-lead { font-size: 15px; }
}

/* 4. 目次
 *==================================*/
.toc {
  background: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 16px 20px;
  margin-bottom: 32px;
}
.toc-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 10px;
}
.toc ol {
  padding-left: 20px;
}
.toc li {
  margin-bottom: 6px;
  font-size: 14px;
  line-height: 1.5;
}
.toc a {
  color: var(--color-link-sp);
  text-decoration: none;
}
.toc a:hover { text-decoration: underline; }

@media (min-width: 768px) {
  .toc { padding: 20px 24px; }
  .toc li { font-size: 14px; }
  .toc a { color: var(--color-link); }
}

/* 5. 見出し
 *==================================*/
.article-body h2 {
  font-size: clamp(20px, 4vw, 22px);
  font-weight: 700;
  padding: 12px 16px;
  margin: 36px 0 16px;
  background: var(--color-bg-light);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 4px 4px 0;
  color: var(--color-text);
}
.article-body h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 24px 0 10px;
  padding-left: 12px;
  border-left: 3px solid var(--color-primary-light);
  color: var(--color-text);
}

@media (min-width: 768px) {
  .article-body h2 { padding: 14px 20px; }
  .article-body h3 { font-size: 18px; }
}

/* 6. 本文タイポグラフィ
 *==================================*/
.article-body {
  overflow-wrap: break-word;
  word-wrap: break-word;
}
.article-body p {
  margin-bottom: 16px;
  line-height: 1.85;
  font-size: 16px;
}
.article-body ul,
.article-body ol {
  margin: 0 0 16px 24px;
  line-height: 1.85;
  font-size: 16px;
}
.article-body li { margin-bottom: 6px; }
.article-body strong { color: var(--color-text); }
.article-body blockquote {
  border-left: 3px solid var(--color-border);
  padding: 12px 16px;
  margin: 16px 0;
  background: var(--color-bg-light);
  font-size: 13px;
  color: var(--color-text-light);
}
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 13px;
}
.article-body th,
.article-body td {
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
  word-break: break-word;
}
@media (max-width: 767px) {
  .article-body table {
    table-layout: fixed;
  }
  .article-body td,
  .article-body th {
    word-break: break-word;
    overflow-wrap: break-word;
  }
}
.article-body th {
  background: var(--color-bg-light);
  font-weight: 600;
  font-size: 12px;
  color: var(--color-text-light);
}
.article-body .note {
  font-size: 12px;
  color: var(--color-text-light);
  margin: 8px 0 16px;
}

@media (min-width: 768px) {
  .article-body p { font-size: 16px; }
  .article-body ul,
  .article-body ol { font-size: 16px; }
  .article-body table { font-size: 14px; }
}

/* 7. 用語定義リスト（記事2用）
 *==================================*/
.glossary-list {
  margin: 16px 0;
}
.glossary-item {
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-border);
}
.glossary-item:first-child {
  border-top: 1px solid var(--color-border);
}
.glossary-item dt {
  font-weight: 700;
  font-size: 14px;
  color: var(--color-primary);
  margin-bottom: 4px;
}
.glossary-item dd {
  font-size: 13px;
  line-height: 1.7;
  color: var(--color-text);
}

/* 8. 中間CTA
 *==================================*/
.article-cta {
  background: var(--color-primary-bg);
  border: 1px solid var(--color-primary-light);
  border-radius: 10px;
  padding: 20px;
  margin: 32px 0;
  text-align: center;
}
.article-cta__text {
  font-size: 14px;
  color: var(--color-text);
  margin-bottom: 12px;
}
.article-cta__btn {
  display: inline-block;
  padding: 12px 28px;
  background: var(--color-primary);
  color: #fff !important;
  font-size: 14px;
  font-weight: 700;
  border-radius: 8px;
  text-decoration: none;
  transition: background .2s;
}
.article-cta__btn:hover {
  background: var(--color-primary-dark);
  text-decoration: none;
}

/* 9. 末尾CTA（3方向）
 *==================================*/
.article-cta-end {
  margin: 40px 0 32px;
  text-align: center;
}
.article-cta-end__lead {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 16px;
}
.article-cta-end__sub {
  font-size: 13px;
  color: var(--color-text-light);
  margin-bottom: 16px;
}
.cta-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  max-width: 400px;
  margin: 0 auto;
}
.cta-card {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  background: #fff;
  border: 2px solid var(--color-border);
  border-radius: 10px;
  color: var(--color-text);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: border-color .2s, background .2s;
}
.cta-card:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-bg);
  text-decoration: none;
  color: var(--color-primary);
}
.cta-card--primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.cta-card--primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: #fff;
}
.cta-card__icon { font-size: 20px; flex-shrink: 0; }

@media (min-width: 768px) {
  .cta-grid {
    grid-template-columns: repeat(3, 1fr);
    max-width: 100%;
  }
}

/* 10. 関連記事
 *==================================*/
.related-articles {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}
.related-articles h2 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 16px;
  padding: 0;
  background: none;
  border-left: none;
}
.related-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.related-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 14px 10px;
  background: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  text-align: center;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  transition: background .2s, box-shadow .2s;
}
.related-card:hover {
  background: #fff;
  box-shadow: var(--shadow-md);
  text-decoration: none;
  color: var(--color-text);
}
.related-card__icon { font-size: 20px; }

@media (min-width: 768px) {
  .related-grid { grid-template-columns: repeat(4, 1fr); gap: 12px; }
  .related-card { font-size: 13px; padding: 16px 12px; }
}

/* 11. LPに戻るボタン（右下フローティング）
 *==================================*/
.back-to-lp {
  position: fixed;
  bottom: 76px;
  right: 16px;
  z-index: 900;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 10px 14px;
  background: var(--color-primary);
  color: #fff !important;
  font-size: 11px;
  font-weight: 700;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,.2);
  text-decoration: none;
  transition: background .2s, transform .15s;
}
.back-to-lp:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  text-decoration: none;
}