/* ================================================================
   ネット民心理学 — メインスタイルシート
   https://sns.kurushiunai.jp/
   ================================================================ */

/* ── Google Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+JP:wght@300;400;500;600;700;900&family=Noto+Sans+JP:wght@300;400;500;700&family=Shippori+Mincho:wght@400;500;600;700;800&display=swap');

/* ── CSS変数 ── */
:root {
  --color-bg: #fafaf8;
  --color-white: #ffffff;
  --color-primary: #1a1a2e;
  --color-secondary: #16213e;
  --color-accent: #9b6b2f;
  --color-accent-light: #c9a87c;
  --color-accent-dark: #7a5220;
  --color-crimson: #7b1f1f;
  --color-text: #2d2d2d;
  --color-text-light: #6b6b6b;
  --color-text-muted: #999999;
  --color-border: #e8e0d4;
  --color-border-light: #f0ebe3;
  --color-card: #ffffff;
  --color-section-bg: #f7f4ef;
  --color-hero-bg: #0f0f1a;
  --font-serif: 'Shippori Mincho', 'Noto Serif JP', 'Yu Mincho', '游明朝', serif;
  --font-sans: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', sans-serif;
  --shadow-sm: 0 2px 8px rgba(26,26,46,0.06);
  --shadow-md: 0 4px 20px rgba(26,26,46,0.10);
  --shadow-lg: 0 8px 40px rgba(26,26,46,0.14);
  --shadow-xl: 0 16px 60px rgba(26,26,46,0.18);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --transition: 0.3s ease;
  --max-width: 1200px;
  --article-width: 840px;
  --header-height: 64px;
}

/* ── リセット・ベース ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding-top: var(--header-height);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition), opacity var(--transition);
}

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

/* ── サイトヘッダー ── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  display: flex;
  align-items: baseline;
  gap: 10px;
  text-decoration: none;
}

.site-logo-main {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.04em;
}

.site-logo-sub {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--color-accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.header-tagline {
  font-size: 0.72rem;
  color: var(--color-text-muted);
  font-weight: 400;
  letter-spacing: 0.06em;
  display: none;
}

@media (min-width: 768px) {
  .header-tagline {
    display: block;
  }
}

/* ── ヒーローセクション（トップページ） ── */
.hero {
  background: var(--color-hero-bg);
  color: var(--color-white);
  position: relative;
  overflow: hidden;
  padding: 80px 24px 100px;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(ellipse, rgba(155,107,47,0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  right: -10%;
  width: 50%;
  height: 150%;
  background: radial-gradient(ellipse, rgba(123,31,31,0.12) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  padding: 5px 16px;
  border: 1px solid rgba(201,168,124,0.5);
  color: var(--color-accent-light);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: 24px;
  font-family: var(--font-sans);
}

.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.02em;
  margin-bottom: 20px;
}

.hero-title .accent {
  color: var(--color-accent-light);
  display: block;
}

.hero-lead {
  font-size: clamp(0.95rem, 2vw, 1.1rem);
  line-height: 1.9;
  color: rgba(255,255,255,0.8);
  max-width: 640px;
  margin-bottom: 40px;
}

.hero-stats {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
}

.hero-stat {
  text-align: left;
}

.hero-stat-num {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--color-accent-light);
  line-height: 1;
  display: block;
}

.hero-stat-label {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.6);
  letter-spacing: 0.08em;
  display: block;
  margin-top: 4px;
}

/* ── 区切り線 ── */
.divider {
  width: 40px;
  height: 2px;
  background: var(--color-accent);
  margin: 0 auto 20px;
}

.divider-left {
  margin: 0 0 20px;
}

/* ── セクション共通 ── */
.section {
  padding: 80px 24px;
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-header {
  margin-bottom: 48px;
}

.section-label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  display: block;
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.3;
  letter-spacing: 0.02em;
}

.section-desc {
  font-size: 0.95rem;
  color: var(--color-text-light);
  margin-top: 16px;
  max-width: 600px;
  line-height: 1.8;
}

/* ── Aboutセクション ── */
.about-section {
  background: var(--color-white);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
}

@media (min-width: 768px) {
  .about-grid {
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: start;
  }
}

.about-text {
  font-size: 1rem;
  line-height: 2;
  color: var(--color-text);
}

.about-text p + p {
  margin-top: 20px;
}

.about-text strong {
  color: var(--color-crimson);
  font-weight: 600;
}

.about-features {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.feature-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 20px;
  background: var(--color-section-bg);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.feature-icon {
  font-size: 1.4rem;
  line-height: 1;
  flex-shrink: 0;
  margin-top: 2px;
}

.feature-title {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 6px;
}

.feature-desc {
  font-size: 0.85rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ── 注目記事セクション ── */
.featured-section {
  background: var(--color-section-bg);
}

.featured-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 640px) {
  .featured-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .featured-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.featured-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), transform var(--transition);
  border: 1px solid var(--color-border-light);
}

.featured-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.featured-card-img {
  width: 100%;
  aspect-ratio: 16/9;
  background: linear-gradient(135deg, var(--color-primary) 0%, #2d1a4e 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.featured-card-img::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(155,107,47,0.3) 0%, rgba(123,31,31,0.2) 100%);
}

.featured-card-img-text {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  color: rgba(255,255,255,0.15);
  font-weight: 900;
  position: relative;
  z-index: 1;
  user-select: none;
}

.featured-card-body {
  padding: 24px;
}

.card-category {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: rgba(155,107,47,0.1);
  padding: 3px 10px;
  border-radius: 2px;
  margin-bottom: 12px;
}

.featured-card-title {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1.6;
  margin-bottom: 12px;
}

.featured-card-title:hover {
  color: var(--color-accent-dark);
}

.featured-card-desc {
  font-size: 0.82rem;
  color: var(--color-text-light);
  line-height: 1.7;
}

.card-read-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-top: 16px;
  letter-spacing: 0.04em;
  transition: gap var(--transition);
}

.card-read-more:hover {
  gap: 10px;
}

/* ── 全記事リストセクション ── */
.articles-section {
  background: var(--color-white);
}

.category-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 40px;
}

.category-tab {
  padding: 8px 18px;
  border: 1px solid var(--color-border);
  border-radius: 40px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--color-text-light);
  cursor: pointer;
  transition: all var(--transition);
  background: transparent;
  font-family: var(--font-sans);
}

.category-tab:hover,
.category-tab.active {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--color-border-light);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
}

@media (min-width: 768px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.article-item {
  background: var(--color-white);
  padding: 20px 24px;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  transition: background var(--transition);
  text-decoration: none;
  color: inherit;
}

.article-item:hover {
  background: var(--color-section-bg);
}

.article-item-num {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-border);
  flex-shrink: 0;
  width: 40px;
  text-align: right;
  line-height: 1;
  margin-top: 2px;
  letter-spacing: -0.02em;
}

.article-item-body {
  flex: 1;
  min-width: 0;
}

.article-item-keyword {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.06em;
  margin-bottom: 4px;
}

.article-item-title {
  font-family: var(--font-serif);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1.6;
  transition: color var(--transition);
}

.article-item:hover .article-item-title {
  color: var(--color-accent-dark);
}

/* ── サイトフッター ── */
.site-footer {
  background: var(--color-primary);
  color: rgba(255,255,255,0.8);
  padding: 48px 24px 32px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  margin-bottom: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

@media (min-width: 768px) {
  .footer-top {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.footer-brand-name {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: 12px;
}

.footer-brand-desc {
  font-size: 0.82rem;
  line-height: 1.8;
  color: rgba(255,255,255,0.6);
}

.footer-col-title {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent-light);
  margin-bottom: 16px;
}

.footer-link-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-link-list a {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.6);
  transition: color var(--transition);
}

.footer-link-list a:hover {
  color: var(--color-white);
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
  text-align: center;
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer-copyright {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.4);
}

.footer-disclaimer {
  font-size: 0.72rem;
  color: rgba(255,255,255,0.3);
}

/* ================================================================
   記事ページスタイル
   ================================================================ */

/* ── パンくずリスト ── */
.breadcrumb {
  background: var(--color-section-bg);
  padding: 12px 24px;
  border-bottom: 1px solid var(--color-border-light);
}

.breadcrumb-inner {
  max-width: var(--article-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.breadcrumb-item {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

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

.breadcrumb-item a:hover {
  text-decoration: underline;
}

.breadcrumb-sep {
  color: var(--color-border);
  font-size: 0.7rem;
}

/* ── 記事ヘッダー ── */
.article-header {
  background: var(--color-white);
  padding: 48px 24px 40px;
  border-bottom: 1px solid var(--color-border-light);
}

.article-header-inner {
  max-width: var(--article-width);
  margin: 0 auto;
}

.article-category-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: rgba(155,107,47,0.1);
  border: 1px solid rgba(155,107,47,0.25);
  padding: 4px 12px;
  border-radius: 2px;
  margin-bottom: 20px;
}

.article-title {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.35;
  letter-spacing: 0.01em;
  margin-bottom: 24px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

.article-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

/* ── 記事アイキャッチ ── */
.article-eyecatch {
  width: 100%;
  max-width: var(--article-width);
  margin: 0 auto;
  overflow: hidden;
}

.article-eyecatch img {
  width: 100%;
  height: auto;
}

.eyecatch-placeholder {
  aspect-ratio: 16/9;
  background: linear-gradient(135deg, var(--color-primary) 0%, #1e1040 50%, var(--color-crimson) 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  position: relative;
  overflow: hidden;
}

.eyecatch-placeholder::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(155,107,47,0.25) 0%, transparent 60%);
}

.eyecatch-kw {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 900;
  color: rgba(255,255,255,0.08);
  position: absolute;
  user-select: none;
  letter-spacing: 0.04em;
}

.eyecatch-label {
  font-family: var(--font-serif);
  font-size: clamp(1.2rem, 2.5vw, 1.8rem);
  font-weight: 700;
  color: var(--color-accent-light);
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 0 24px;
  letter-spacing: 0.06em;
}

.eyecatch-sub {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  position: relative;
  z-index: 1;
}

/* ── 記事本文 ── */
.article-body-wrapper {
  padding: 0 24px;
}

.article-body {
  max-width: var(--article-width);
  margin: 0 auto;
  padding: 56px 0 80px;
}

/* 記事内共通 */
.article-body h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 2.5vw, 1.7rem);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.4;
  margin: 56px 0 24px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--color-border);
  position: relative;
}

.article-body h2::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 60px;
  height: 2px;
  background: var(--color-accent);
}

.article-body h3 {
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1.5;
  margin: 40px 0 16px;
  padding-left: 16px;
  border-left: 3px solid var(--color-accent);
}

.article-body h4 {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-secondary);
  margin: 32px 0 12px;
}

.article-body p {
  font-size: 1rem;
  line-height: 2;
  color: var(--color-text);
  margin-bottom: 24px;
}

.article-body strong {
  font-weight: 700;
  color: var(--color-primary);
}

.article-body em {
  font-style: italic;
  color: var(--color-crimson);
}

.article-body ul,
.article-body ol {
  margin: 24px 0 28px;
  padding-left: 28px;
}

.article-body li {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--color-text);
  margin-bottom: 8px;
}

.article-body ul li::marker {
  color: var(--color-accent);
}

.article-body ol li::marker {
  color: var(--color-accent);
  font-weight: 600;
}

/* 引用・事例ボックス */
.sns-example {
  background: #fdf9f4;
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-crimson);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 24px 28px;
  margin: 32px 0;
  position: relative;
}

.sns-example::before {
  content: 'SNS実例';
  position: absolute;
  top: -1px;
  left: -1px;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-white);
  background: var(--color-crimson);
  padding: 3px 10px;
}

.sns-example-text {
  font-size: 0.95rem;
  line-height: 1.9;
  color: var(--color-text);
  margin: 0;
  font-style: italic;
}

.sns-example-source {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 10px;
  text-align: right;
}

/* ポイントボックス */
.point-box {
  background: linear-gradient(135deg, #f7f4ef 0%, #fdf9f4 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 32px;
  margin: 36px 0;
}

.point-box-title {
  font-family: var(--font-serif);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-accent-dark);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.75rem;
}

.point-box ul {
  margin: 0;
  padding-left: 20px;
}

.point-box li {
  font-size: 0.95rem;
  margin-bottom: 10px;
  color: var(--color-text);
  line-height: 1.8;
}

/* 警告ボックス */
.warning-box {
  background: rgba(123,31,31,0.04);
  border: 1px solid rgba(123,31,31,0.2);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin: 36px 0;
}

.warning-box-title {
  font-family: var(--font-serif);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-crimson);
  margin-bottom: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.warning-box p {
  font-size: 0.93rem;
  margin-bottom: 0;
  color: var(--color-text);
}

/* 引用 */
.article-body blockquote {
  background: var(--color-section-bg);
  border-left: 3px solid var(--color-accent);
  padding: 20px 24px;
  margin: 28px 0;
  font-style: italic;
  color: var(--color-text-light);
  font-size: 0.95rem;
  line-height: 1.9;
}

/* リードイン段落 */
.lead-paragraph {
  font-size: 1.08rem !important;
  line-height: 2.1 !important;
  color: var(--color-secondary) !important;
  font-weight: 400;
  border-left: none;
  padding: 0;
}

/* 心理学用語ハイライト */
.psych-term {
  display: inline;
  font-weight: 700;
  color: var(--color-accent-dark);
  border-bottom: 1px dotted var(--color-accent);
  cursor: help;
}

/* 記事内テーブル */
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 0.9rem;
}

.article-body th {
  background: var(--color-primary);
  color: var(--color-white);
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
}

.article-body td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border-light);
  vertical-align: top;
  line-height: 1.7;
}

.article-body tr:nth-child(even) td {
  background: var(--color-section-bg);
}

/* まとめセクション（.article-body p / ul / li より詳細度を上げて適用） */
.article-body .article-summary {
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 40px 40px;
  margin: 48px 0;
}

.article-body .article-summary .article-summary-title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-white);
  line-height: 1.5;
  margin-bottom: 20px;
  letter-spacing: 0.04em;
}

.article-body .article-summary ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.article-body .article-summary li {
  font-size: 0.95rem;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.85);
  line-height: 1.8;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.article-body .article-summary li::before {
  content: '▶';
  color: var(--color-accent-light);
  font-size: 0.7rem;
  flex-shrink: 0;
  margin-top: 5px;
}

.article-body .article-summary li:last-child {
  border-bottom: none;
}

/* ── 関連記事 ── */
.related-articles {
  padding: 48px 24px;
  background: var(--color-section-bg);
}

.related-articles-inner {
  max-width: var(--article-width);
  margin: 0 auto;
}

.related-articles-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 28px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.related-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 640px) {
  .related-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.related-card {
  background: var(--color-white);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: 20px;
  text-decoration: none;
  color: inherit;
  transition: all var(--transition);
  display: block;
}

.related-card:hover {
  box-shadow: var(--shadow-sm);
  border-color: var(--color-accent-light);
  transform: translateY(-2px);
}

.related-card-kw {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.08em;
  margin-bottom: 8px;
  display: block;
}

.related-card-title {
  font-family: var(--font-serif);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1.6;
}

/* ── ページトップへ戻るボタン ── */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  transform: translateY(16px);
  transition: all var(--transition);
  z-index: 99;
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-accent-dark);
}

/* ── 目次 ── */
.toc {
  background: var(--color-section-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px 32px;
  margin: 40px 0;
}

.toc-title {
  font-family: var(--font-serif);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
  letter-spacing: 0.04em;
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: toc-counter;
}

.toc-list li {
  counter-increment: toc-counter;
  margin-bottom: 8px;
  font-size: 0.88rem;
}

.toc-list li::before {
  content: counter(toc-counter, decimal-leading-zero) '.';
  color: var(--color-accent);
  font-weight: 600;
  margin-right: 10px;
  font-size: 0.8rem;
}

.toc-list a {
  color: var(--color-text-light);
  transition: color var(--transition);
}

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

/* ── シェアボタン ── */
.share-section {
  padding: 32px 24px;
  background: var(--color-white);
  border-top: 1px solid var(--color-border-light);
}

.share-section-inner {
  max-width: var(--article-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.share-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.share-btns {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  text-decoration: none;
}

.share-btn-x {
  background: #000;
  color: #fff;
}

.share-btn-x:hover {
  background: #333;
  color: #fff;
}

.share-btn-line {
  background: #06c755;
  color: #fff;
}

.share-btn-line:hover {
  background: #05b34a;
  color: #fff;
}

.share-btn-copy {
  background: var(--color-section-bg);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.share-btn-copy:hover {
  background: var(--color-border-light);
}

/* ── 読了プログレスバー ── */
.reading-progress {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-crimson) 100%);
  z-index: 99;
  transition: width 0.1s linear;
}

/* ── アニメーション ── */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-up {
  opacity: 0;
  animation: fadeInUp 0.6s ease forwards;
}

.fade-in-up-delay-1 { animation-delay: 0.1s; }
.fade-in-up-delay-2 { animation-delay: 0.2s; }
.fade-in-up-delay-3 { animation-delay: 0.3s; }

/* ── スクロールアニメーション ── */
.scroll-reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.scroll-reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ── 検索バー ── */
.search-bar {
  background: var(--color-section-bg);
  padding: 32px 24px;
  border-bottom: 1px solid var(--color-border-light);
}

.search-bar-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.search-form {
  display: flex;
  gap: 0;
  max-width: 480px;
  box-shadow: var(--shadow-sm);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.search-input {
  flex: 1;
  padding: 12px 20px;
  font-size: 0.9rem;
  font-family: var(--font-sans);
  border: 1px solid var(--color-border);
  border-right: none;
  border-radius: var(--radius-md) 0 0 var(--radius-md);
  outline: none;
  background: var(--color-white);
  color: var(--color-text);
  transition: border-color var(--transition);
}

.search-input:focus {
  border-color: var(--color-accent);
}

.search-btn {
  padding: 12px 24px;
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-family: var(--font-sans);
  transition: background var(--transition);
}

.search-btn:hover {
  background: var(--color-accent-dark);
}

/* ── レスポンシブ調整 ── */
@media (max-width: 480px) {
  .article-body {
    padding: 32px 0 60px;
  }

  .article-body h2 {
    font-size: 1.3rem;
    margin: 40px 0 18px;
  }

  .article-body h3 {
    font-size: 1.1rem;
  }

  .article-body .article-summary {
    padding: 28px 24px;
  }

  .hero {
    padding: 60px 20px 80px;
  }

  .section {
    padding: 60px 20px;
  }

  .hero-stats {
    gap: 24px;
  }
}

/* ── プリント対応 ── */
@media print {
  .site-header,
  .back-to-top,
  .reading-progress,
  .share-section,
  .related-articles {
    display: none;
  }

  .article-body {
    max-width: 100%;
    padding: 0;
  }
}