/* ============================================
   kanabou.jp SEO記事コンテンツ 共通スタイル（ダークテーマ）
   ============================================ */

:root {
  --color-bg: #0b0b0c;         /* サイト全体の背景：黒 */
  --color-bg-soft: #131315;    /* セクション背景の黒（少し明るめ） */
  --color-ink: #f2efe9;        /* 本文の基本文字色：明るいオフホワイトで視認性を確保 */
  --color-sub: #b9b3a7;        /* 補足テキスト：明るめのグレー系 */
  --color-accent: #e8a34c;     /* アクセントカラー：黒背景に映える暖色ゴールド */
  --color-accent-soft: #2a2115; /* アクセントの背景用（暗め） */
  --color-line: #2c2c2e;       /* 区切り線：ダークグレー */
  --color-card: #17171a;       /* カード背景：黒よりわずかに明るい */
  --font-serif: "Shippori Mincho", "Noto Serif JP", serif;
  --font-sans: "Noto Sans JP", "Hiragino Kaku Gothic ProN", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background-color: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-sans);
  line-height: 1.9;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 11, 12, 0.9);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--color-line);
}

.site-header__inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  display: flex;
  align-items: baseline;
  gap: 8px;
  color: var(--color-ink);
}

.site-logo span {
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--color-sub);
  font-family: var(--font-sans);
}

.site-nav {
  display: flex;
  gap: 28px;
  font-size: 0.88rem;
  color: var(--color-ink);
}

.site-nav a {
  position: relative;
  padding-bottom: 4px;
  transition: color 0.2s;
}

.site-nav a:hover {
  color: var(--color-accent);
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  max-width: 860px;
  margin: 24px auto 0;
  padding: 0 24px;
  font-size: 0.78rem;
  color: var(--color-sub);
}

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

.breadcrumb .sep {
  margin: 0 6px;
  color: var(--color-line);
}

/* ---------- Article ---------- */
.article-wrap {
  max-width: 860px;
  margin: 0 auto;
  padding: 40px 24px 100px;
}

.article-header {
  margin-bottom: 36px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 0.8rem;
  color: var(--color-sub);
  margin-bottom: 18px;
}

.article-meta .tag {
  background: var(--color-accent-soft);
  color: var(--color-accent);
  padding: 4px 12px;
  border-radius: 100px;
  font-weight: 600;
  letter-spacing: 0.05em;
}

.article-title {
  font-family: var(--font-serif);
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  line-height: 1.55;
  font-weight: 700;
  margin: 0 0 20px;
  color: var(--color-ink);
}

.article-hero {
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: 12px;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--color-line);
}

.article-hero img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-caption {
  font-size: 0.75rem;
  color: var(--color-sub);
  text-align: right;
  margin: 0 0 8px;
}

.lead-block {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: 8px;
  padding: 28px 30px;
  margin: 32px 0 8px;
  font-size: 0.98rem;
  color: var(--color-ink);
}

.lead-block p {
  margin: 0 0 1.1em;
}

.lead-block p:last-child {
  margin-bottom: 0;
}

/* Table of contents */
.toc {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: 8px;
  padding: 24px 28px;
  margin: 40px 0;
}

.toc__title {
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-ink);
}

.toc__title i {
  color: var(--color-accent);
}

.toc ol {
  margin: 0;
  padding-left: 1.3em;
  font-size: 0.9rem;
}

.toc li {
  margin-bottom: 8px;
}

.toc a {
  color: var(--color-ink);
  border-bottom: 1px dashed transparent;
  transition: border-color 0.2s, color 0.2s;
}

.toc a:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* Body content */
.article-body {
  font-size: 1.02rem;
  color: var(--color-ink);
}

.article-body h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 3vw, 1.6rem);
  line-height: 1.5;
  font-weight: 700;
  margin: 56px 0 22px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--color-ink);
  display: flex;
  align-items: baseline;
  gap: 12px;
  color: var(--color-ink);
}

.article-body h2 .num {
  font-family: var(--font-serif);
  font-size: 1rem;
  color: #1a1408;
  background: var(--color-accent);
  border-radius: 50%;
  width: 1.9em;
  height: 1.9em;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.article-body p {
  margin: 0 0 1.3em;
  color: var(--color-ink);
}

.article-body ul {
  margin: 0 0 1.5em;
  padding-left: 1.4em;
  list-style: none;
}

.article-body ul li {
  position: relative;
  margin-bottom: 10px;
  padding-left: 1.1em;
  color: var(--color-ink);
}

.article-body ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
}

.point-box {
  background: var(--color-accent-soft);
  border: 1px solid #3a2c17;
  border-radius: 8px;
  padding: 24px 26px;
  margin: 24px 0 30px;
}

.point-box p {
  margin: 0;
  font-weight: 600;
  color: var(--color-ink);
}

.example-list {
  display: grid;
  gap: 10px;
  margin: 20px 0 30px;
}

.example-list__item {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: 6px;
  padding: 14px 18px;
  font-size: 0.96rem;
  color: var(--color-ink);
}

.quote-line {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  border-left: 3px solid var(--color-accent);
  padding: 4px 0 4px 20px;
  margin: 24px 0 30px;
  color: var(--color-ink);
}

/* Summary section */
.summary-block {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  color: var(--color-ink);
  border-radius: 10px;
  padding: 40px 34px;
  margin-top: 60px;
}

.summary-block h2 {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  margin: 0 0 20px;
  border: none;
  padding: 0;
  color: var(--color-accent);
}

.summary-block ol {
  margin: 0 0 22px;
  padding-left: 1.4em;
}

.summary-block ol li {
  margin-bottom: 10px;
}

.summary-block p {
  margin: 0 0 1.2em;
  color: var(--color-ink);
}

.summary-block p:last-child {
  margin-bottom: 0;
}

/* CTA */
.cta-box {
  margin-top: 48px;
  text-align: center;
  border: 1px solid var(--color-line);
  border-radius: 10px;
  padding: 40px 30px;
  background: var(--color-card);
}

.cta-box h3 {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  margin: 0 0 12px;
  color: var(--color-ink);
}

.cta-box p {
  color: var(--color-sub);
  margin: 0 0 22px;
  font-size: 0.94rem;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-accent);
  color: #1a1408;
  padding: 14px 34px;
  border-radius: 100px;
  font-weight: 700;
  font-size: 0.95rem;
  transition: transform 0.2s, box-shadow 0.2s;
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(232, 163, 76, 0.3);
}

/* Author */
.author-box {
  margin-top: 48px;
  display: flex;
  gap: 16px;
  align-items: center;
  border-top: 1px solid var(--color-line);
  padding-top: 30px;
}

.author-box__avatar {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: var(--color-accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  font-size: 1.3rem;
  flex-shrink: 0;
}

.author-box__name {
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--color-ink);
}

.author-box__desc {
  font-size: 0.85rem;
  color: var(--color-sub);
  margin: 0;
}

/* Share */
.share-row {
  display: flex;
  gap: 12px;
  margin: 34px 0;
  align-items: center;
  font-size: 0.8rem;
  color: var(--color-sub);
}

.share-row .icons {
  display: flex;
  gap: 10px;
}

.share-row .icons a {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--color-card);
  border: 1px solid var(--color-line);
  color: var(--color-ink);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, color 0.2s;
}

.share-row .icons a:hover {
  background: var(--color-accent);
  color: #1a1408;
  border-color: var(--color-accent);
}

/* Related */
.related-section {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px 100px;
}

.related-section h2 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  margin-bottom: 24px;
  color: var(--color-ink);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.related-card {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: 8px;
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}

.related-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.4);
  border-color: var(--color-accent);
}

.related-card__img {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--color-bg-soft);
}

.related-card__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.related-card__body {
  padding: 16px 18px 20px;
}

.related-card__tag {
  font-size: 0.72rem;
  color: var(--color-accent);
  font-weight: 700;
  margin-bottom: 8px;
  display: block;
}

.related-card__title {
  font-size: 0.94rem;
  line-height: 1.6;
  font-weight: 600;
  color: var(--color-ink);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-line);
  padding: 50px 24px 30px;
  text-align: center;
  color: var(--color-sub);
  font-size: 0.8rem;
  background: var(--color-bg-soft);
}

.site-footer .site-logo {
  justify-content: center;
  margin-bottom: 14px;
  color: var(--color-ink);
}

.site-footer nav {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.site-footer nav a:hover {
  color: var(--color-accent);
}

/* ---------- Blog list (index) ---------- */
.hero-section {
  max-width: 1080px;
  margin: 0 auto;
  padding: 60px 24px 20px;
  text-align: center;
}

.hero-section .eyebrow {
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  font-weight: 700;
  margin-bottom: 14px;
}

.hero-section h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  margin: 0 0 18px;
  color: var(--color-ink);
}

.hero-section p {
  color: var(--color-sub);
  max-width: 600px;
  margin: 0 auto;
}

/* ---------- Hero visual (top page) ---------- */
.hero-visual {
  max-width: 1080px;
  margin: 0 auto;
  padding: 20px 24px 0;
}

.hero-visual__frame {
  position: relative;
  border-radius: 12px;
  overflow: hidden;
  aspect-ratio: 16 / 7;
  border: 1px solid var(--color-line);
}

.hero-visual__frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-visual__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11,11,12,0) 40%, rgba(11,11,12,0.85) 100%);
}

.hero-visual__caption {
  font-size: 0.75rem;
  color: var(--color-sub);
  text-align: right;
  margin: 8px 0 0;
}

.blog-grid-wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 40px 24px 100px;
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.blog-card {
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: 10px;
  overflow: hidden;
  transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
}

.blog-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.45);
  border-color: var(--color-accent);
}

.blog-card--featured {
  grid-column: span 3;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
}

.blog-card__img {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--color-bg-soft);
}

.blog-card--featured .blog-card__img {
  aspect-ratio: auto;
  height: 100%;
}

.blog-card__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.blog-card__body {
  padding: 22px 24px 26px;
  display: flex;
  flex-direction: column;
}

.blog-card--featured .blog-card__body {
  justify-content: center;
  padding: 34px 40px;
}

.blog-card__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.75rem;
  color: var(--color-sub);
  margin-bottom: 12px;
}

.blog-card__meta .tag {
  background: var(--color-accent-soft);
  color: var(--color-accent);
  padding: 3px 10px;
  border-radius: 100px;
  font-weight: 700;
}

.blog-card__title {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.6;
  font-size: 1.02rem;
  margin: 0 0 10px;
  color: var(--color-ink);
}

.blog-card--featured .blog-card__title {
  font-size: 1.5rem;
}

.blog-card__excerpt {
  color: var(--color-sub);
  font-size: 0.88rem;
  margin: 0;
}

/* Responsive */
@media (max-width: 860px) {
  .related-grid,
  .blog-grid {
    grid-template-columns: 1fr;
  }
  .blog-card--featured {
    grid-column: span 1;
    grid-template-columns: 1fr;
  }
  .site-nav {
    gap: 16px;
    font-size: 0.8rem;
  }
  .article-wrap {
    padding: 28px 18px 70px;
  }
  .lead-block,
  .toc {
    padding: 20px;
  }
  .summary-block {
    padding: 28px 22px;
  }
  .hero-visual__frame {
    aspect-ratio: 4 / 3;
  }
}