/*
Theme Name: FDE INSIGHTS
Theme URI: https://insights.open-fde.jp
Author: open inc.
Description: FDE INSIGHTS custom theme
Version: 1.0.0
*/

@charset "utf-8";

/* ============================================
   OWNED MEDIA – GLOBAL STYLES
   B2B Minimal Tone / White × Dark Typography
   ============================================ */

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-bg:         transparent;
  --color-surface:    #f7f7f5;
  --color-border:     #e2e2de;
  --color-text:       #0f172a;
  --color-text-sub:   #6b6b66;
  --color-text-muted: #9d9d98;
  --color-accent:     #0f172a;
  --color-accent-hover: #1e293b;
  --color-label-int:  #0f172a;
  --color-label-case: #3d5a4a;
  --color-label-tech: #2d3d5a;
  --font-ja: "Noto Sans JP", "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
  --font-en: "Google Sans Flex", "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
  --font-sans: var(--font-ja);
  --font-mono: 'JetBrains Mono', monospace;
  --max-w: 1440px;
  --max-w-article: 1120px;
  --gutter: 40px;
  --radius: 2px;
  --transition: 0.2s ease;
}

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

body {
  font-family: var(--font-ja);
  background-color: #f0efeb;
  background-image: url('images/main-bg.jpg');
  background-repeat: repeat;
  background-size: 100px 100px;
  background-attachment: local;
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

.font-en,
.hero-title,
.hero-eyebrow,
.articles-grid-label,
.featured-label,
.article-label,
.read-more,
.nav-cta,
.filter-btn,
.section-title,
.info-box-title,
.info-label,
.sidebar-toc-title,
.sidebar-cta-label,
.breadcrumb-list {
  font-family: var(--font-en);
}

a { color: inherit; text-decoration: none; }
img { display: block; width: 100%; height: auto; }
ul, ol { list-style: none; }

/* ---------- Layout ---------- */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.container-article {
  max-width: var(--max-w-article);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

@media (max-width: 768px) {
  :root { --gutter: 20px; }
}

/* ---------- Typography ---------- */
.text-xs    { font-size: 0.6875rem; letter-spacing: 0.08em; }
.text-sm    { font-size: 0.8125rem; }
.text-base  { font-size: 1rem; }
.text-lg    { font-size: 1.125rem; }
.text-xl    { font-size: 1.375rem; }
.text-2xl   { font-size: 1.75rem; }
.text-3xl   { font-size: 2.25rem; }
.text-4xl   { font-size: 3rem; }
.text-5xl   { font-size: 4rem; }

/* ============================================
   HEADER
   ============================================ */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: transparent;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-en);
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-text);
}

.site-logo img {
  display: inline-block;
  width: auto;
  height: 28px;
  object-fit: contain;
  border-radius: 4px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.site-nav a {
  font-family: var(--font-en);
  font-size: 0.8125rem;
  color: var(--color-text-sub);
  letter-spacing: 0.01em;
  transition: color var(--transition);
}

.site-nav a:hover,
.site-nav a.active,
.site-nav a.is-active { color: var(--color-text); }

.site-nav a.active,
.site-nav a.is-active { font-weight: 600; }

.nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 8px 18px;
  background: var(--color-text);
  color: #fff !important;
  font-family: var(--font-ja);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  border-radius: var(--radius);
  transition: background var(--transition);
}

.nav-cta:hover { background: var(--color-accent-hover); }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 6px;
  background: none;
  border: none;
}

.hamburger span {
  display: block;
  width: 22px; height: 1.5px;
  background: var(--color-text);
  transition: var(--transition);
}

@media (max-width: 768px) {
  .site-nav { display: none; }
  .hamburger { display: flex; }
  .site-nav.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 56px; left: 0; right: 0;
    background: #ffffff;
    border-bottom: 1px solid var(--color-border);
    padding: 24px var(--gutter);
    gap: 20px;
    align-items: flex-end;
  }
}

/* ============================================
   PAGE OFFSET (fixed header)
   ============================================ */
.page-body { padding-top: 56px; }

/* ============================================
   HERO (front-page)
   ============================================ */
.hero {
  position: relative;
  overflow: hidden;
  padding: 80px 0 72px;
  border-bottom: 1px solid var(--color-border);
  background: transparent;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
  width: 100%;
}

.hero-content {
  min-width: 0;
  width: 100%;
  overflow: hidden;
}

.hero-title {
  font-family: var(--font-en);
  font-weight: 700;
  line-height: 0.95;
  letter-spacing: -0.04em;
  color: var(--color-text);
  margin-bottom: 20px;
  width: 100%;
  overflow: hidden;
}

.hero-title-line {
  display: block;
  white-space: nowrap;
  width: 100%;
}

.hero-subtitle {
  font-family: var(--font-ja);
  font-size: clamp(1.125rem, 2.5vw, 1.5rem);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--color-text);
  margin-bottom: 20px;
}

.hero-lead {
  font-family: var(--font-ja);
  font-size: 0.9375rem;
  color: var(--color-text-sub);
  line-height: 1.8;
  max-width: 520px;
  margin-bottom: 0;
}

.hero-latest-article {
  display: block;
  background: transparent;
  border: none;
  overflow: visible;
  color: inherit;
  text-decoration: none;
}

.hero-latest-article .latest-thumb {
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--color-surface);
  width: 100%;
}

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

.hero-latest-article .latest-thumb-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #e8e7e1 0%, #d8d7cf 100%);
}

.hero-latest-article .latest-body {
  padding: 10px 0 0;
  margin: 0;
  width: 100%;
  box-sizing: border-box;
}

.latest-tags {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 10px 0;
}

.latest-new,
.latest-category {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-en);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-text);
  border: 1px solid var(--color-text);
  padding: 3px 10px 2px;
  border-radius: 2px;
  line-height: 1;
}

.hero-latest-article .latest-title {
  display: block;
  font-family: var(--font-ja);
  font-size: 1.7rem;
  font-weight: 700;
  line-height: 1.55;
  letter-spacing: -0.015em;
  color: var(--color-text);
  padding: 0 !important;
  margin: 0 !important;
  width: 100%;
  transition: opacity 0.2s ease;
}

.hero-latest-article:hover .latest-title {
  opacity: 0.65;
}

@media (max-width: 768px) {
  .hero { padding: 48px 0 48px; }
  .hero-inner { grid-template-columns: 1fr; }
  .hero-latest-article { margin-top: 8px; }
}

/* ============================================
   ARTICLE LIST PAGE
   ============================================ */
.articles-section {
  background: transparent;
}

.articles-section--cs { padding: 40px 0 20px; }
.articles-section--iv { padding: 40px 0 20px; }
.articles-section--fg { padding: 40px 0 60px; }

.articles-section:last-of-type {
  padding: 40px 0 64px;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.card-tags {
  font-family: var(--font-en);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  letter-spacing: 0.03em;
  margin-top: auto;
  padding-top: 12px;
}

.featured-title a {
  color: inherit;
  text-decoration: none;
}
.featured-title a:hover { opacity: 0.7; }

a.featured-image {
  display: block;
  aspect-ratio: 16/9;
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  text-decoration: none;
}

.featured-label {
  font-family: var(--font-en);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--color-text);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.featured-label::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.featured-article {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  padding: 0 0 0;
  margin-bottom: 20px;
}

.featured-image {
  aspect-ratio: 16/9;
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
}

.featured-image-placeholder {
  width: 100%; height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #f0efeb 0%, #e8e7e1 100%);
}

.featured-image-placeholder svg {
  width: 48px; height: 48px;
  opacity: 0.3;
}

.featured-title {
  font-family: var(--font-ja);
  font-size: 1.625rem;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: 16px;
}

.featured-lead {
  font-family: var(--font-ja);
  font-size: 0.9375rem;
  color: var(--color-text-sub);
  line-height: 1.8;
  margin-bottom: 24px;
}

.meta-separator {
  width: 3px; height: 3px;
  border-radius: 50%;
  background: var(--color-border);
}

@media (max-width: 900px) {
  .featured-article {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  border: 1px solid var(--color-border);
}

.article-card {
  background: transparent;
  padding: 32px;
  border-right: 1px solid var(--color-border);
  transition: background var(--transition);
  cursor: pointer;
  display: flex;
  flex-direction: column;
}

.article-card:last-child { border-right: none; }
.article-card:hover { background: rgba(0,0,0,0.03); }

.card-image {
  aspect-ratio: 16/9;
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 24px;
  flex-shrink: 0;
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card-image-placeholder {
  width: 100%; height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-image-placeholder svg {
  width: 32px; height: 32px;
  opacity: 0.25;
}

.card-body { flex: 1; display: flex; flex-direction: column; }

.card-title {
  font-family: var(--font-ja);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: -0.015em;
  color: var(--color-text);
  margin-bottom: 10px;
}

.card-link-wrap {
  display: flex;
  flex-direction: column;
  flex: 1;
  color: inherit;
  text-decoration: none;
}

/* Responsive grids */
@media (max-width: 900px) and (min-width: 601px) {
  .articles-grid {
    grid-template-columns: 1fr 1fr;
  }
  .articles-grid .article-card:nth-child(2) { border-right: none; }
  .articles-grid .article-card:nth-child(3) {
    border-right: none;
    border-top: 1px solid var(--color-border);
    grid-column: span 2;
  }
  .articles-grid--responsive {
    grid-template-columns: 1fr 1fr;
  }
  .articles-grid--responsive .article-card:nth-child(1) {
    grid-column: 1 / -1;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }
  .articles-grid--responsive .article-card:nth-child(2) {
    grid-column: auto;
    border-right: 1px solid var(--color-border);
    border-top: none;
  }
  .articles-grid--responsive .article-card:nth-child(3) {
    grid-column: auto;
    border-right: none;
    border-top: none;
  }
}

@media (max-width: 600px) {
  .articles-grid,
  .articles-grid--responsive {
    grid-template-columns: 1fr;
  }
  .article-card,
  .articles-grid--responsive .article-card--featured-sp {
    border-right: none;
    border-bottom: 1px solid var(--color-border);
    grid-row: auto;
    grid-column: auto;
  }
  .article-card:last-child { border-bottom: none; }
}

/* ============================================
   CTA BAND
   ============================================ */
.cta-band {
  background: var(--color-text);
  color: #fff;
  padding: 64px 0;
}

.cta-band-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
}

.cta-title {
  font-family: var(--font-ja);
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  font-weight: 700;
  line-height: 1.45;
  letter-spacing: -0.02em;
  color: #fff;
}

.cta-buttons {
  display: flex;
  flex-direction: row;
  gap: 12px;
  flex-shrink: 0;
  min-width: 360px;
}

.cta-buttons .btn-primary,
.cta-buttons .btn-secondary {
  flex: 1;
  justify-content: center;
  white-space: nowrap;
  min-width: 0;
}

@media (max-width: 768px) {
  .cta-buttons {
    flex-direction: column;
    min-width: 0;
    width: 100%;
  }
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  padding: 13px 28px;
  background: #f0efeb;
  color: var(--color-text);
  font-family: var(--font-ja);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  border-radius: var(--radius);
  transition: opacity var(--transition);
}

.btn-primary:hover { opacity: 0.85; }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  padding: 13px 28px;
  background: transparent;
  color: #fff;
  font-family: var(--font-en);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: var(--radius);
  transition: border-color var(--transition);
}

.btn-secondary:hover { border-color: rgba(255,255,255,0.6); }

@media (max-width: 768px) {
  .cta-band-inner { flex-direction: column; align-items: flex-start; }
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  background: var(--color-text);
  color: rgba(255,255,255,0.7);
  padding: 56px 0 32px;
}

.footer-inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 48px;
  gap: 40px;
}

.footer-brand-col { flex: 1; }

.footer-brand-name {
  font-family: var(--font-en);
  font-size: 0.9375rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
}

.footer-tagline {
  font-family: var(--font-ja);
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.5);
  line-height: 1.7;
}

.footer-nav-col {
  flex-shrink: 0;
  text-align: right;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  font-family: var(--font-ja);
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.6);
  transition: color var(--transition);
}

.footer-links a:hover { color: #fff; }

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.footer-copy {
  font-family: var(--font-en);
  font-size: 0.75rem;
  color: rgba(255,255,255,0.3);
}

@media (max-width: 768px) {
  .footer-inner { flex-direction: column; gap: 32px; }
  .footer-nav-col { text-align: left; }
}

/* ============================================
   RELATED ARTICLES
   ============================================ */
.related-section {
  padding: 80px 0;
  background: transparent;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
}

.section-title {
  font-family: var(--font-en);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.related-grid--4col {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  justify-content: start;
  gap: 0;
}

.related-grid--4col .article-card {
  border-top:    1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  border-left:   1px solid var(--color-border);
  border-right:  none;
}

.related-grid--4col .article-card:nth-child(4n),
.related-grid--4col .article-card:last-child {
  border-right: 1px solid var(--color-border);
}

@media (max-width: 900px) and (min-width: 601px) {
  .related-grid--4col { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .related-grid--4col .article-card {
    border-top: 1px solid var(--color-border);
    border-left: 1px solid var(--color-border);
    border-right: none;
    border-bottom: none;
  }
  .related-grid--4col .article-card:nth-child(2n),
  .related-grid--4col .article-card:last-child {
    border-right: 1px solid var(--color-border);
  }
  .related-grid--4col .article-card:nth-last-child(-n+2) {
    border-bottom: 1px solid var(--color-border);
  }
}

@media (max-width: 600px) {
  .related-grid--4col { grid-template-columns: 1fr; }
  .related-grid--4col .article-card {
    border-top: 1px solid var(--color-border);
    border-left: 1px solid var(--color-border);
    border-right: 1px solid var(--color-border);
    border-bottom: none;
  }
  .related-grid--4col .article-card:last-child {
    border-bottom: 1px solid var(--color-border);
  }
}

/* ============================================
   CATEGORY LIST PAGE
   ============================================ */
.category-header {
  padding: 120px 0 40px;
  border-bottom: 1px solid var(--color-border);
}

.category-title {
  font-size: 1.5rem !important;
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: 0;
  overflow: visible;
  width: auto;
}

.category-list { padding: 56px 0 80px; }

.articles-grid--category {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: none;
}

.articles-grid--category .article-card {
  border: none !important;
}

@media (max-width: 900px) and (min-width: 601px) {
  .articles-grid--category { grid-template-columns: 1fr 1fr; }
  .articles-grid--category .article-card { grid-column: auto !important; grid-row: auto !important; }
}

@media (max-width: 600px) {
  .articles-grid--category { grid-template-columns: 1fr; }
  .articles-grid--category .article-card { grid-row: auto !important; grid-column: auto !important; }
}

/* ============================================
   ARTICLE DETAIL PAGE
   ============================================ */
.breadcrumb {
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
  background: transparent;
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-en);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  flex-wrap: wrap;
}

.breadcrumb-list li:not(:last-child)::after {
  content: '/';
  margin-left: 8px;
  opacity: 0.4;
}

.breadcrumb-list a { transition: color var(--transition); }
.breadcrumb-list a:hover { color: var(--color-text); }

.breadcrumb-list li:last-child {
  color: var(--color-text-sub);
  max-width: 280px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.post-meta {
  margin-bottom: 20px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0;
}

.post-meta-row {
  display: flex;
  align-items: center;
  gap: 14px;
}

.post-date {
  font-family: var(--font-en);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

.post-tags { margin-top: 16px; }

.post-title {
  font-family: var(--font-ja);
  font-size: clamp(1.625rem, 3.5vw, 2.5rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.025em;
  color: var(--color-text);
  margin-bottom: 20px;
  margin-top: 0;
}

.post-lead {
  font-family: var(--font-ja);
  font-size: 1.0625rem;
  color: var(--color-text-sub);
  line-height: 1.85;
  margin-bottom: 28px;
  border-left: 2px solid var(--color-text);
  padding-left: 20px;
}

.post-eyecatch { margin-bottom: 28px; }

.post-eyecatch img {
  width: 100%;
  height: auto;
  aspect-ratio: 16/9;
  object-fit: cover;
  border-radius: var(--radius);
}

.article-layout {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 64px;
  padding: 56px 0 80px;
  align-items: start;
}

.article-body { min-width: 0; }

.article-body h2 {
  font-family: var(--font-ja);
  font-size: 1.84rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
  margin-bottom: 16px;
  margin-top: 160px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
  scroll-margin-top: 160px;
}

.article-body h2:first-child { margin-top: 0; }

.article-body h3 {
  font-family: var(--font-ja);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 12px;
  margin-top: 32px;
}

.article-body p {
  font-family: var(--font-ja);
  font-size: 1.1rem;
  color: #3d3d38;
  line-height: 2;
  margin-bottom: 18px;
}

.article-body ul {
  list-style: none;
  margin-bottom: 20px;
}

.article-body ul li {
  font-family: var(--font-ja);
  font-size: 0.9375rem;
  color: var(--color-text-sub);
  line-height: 1.8;
  padding: 8px 0 8px 20px;
  border-bottom: 1px solid var(--color-border);
  position: relative;
}

.article-body ul li:first-child { border-top: 1px solid var(--color-border); }

.article-body ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--color-text);
}

.quote-block {
  border-left: 3px solid var(--color-text);
  padding: 24px 32px;
  margin: 36px 0;
  background: var(--color-surface);
}

.quote-text {
  font-family: var(--font-ja);
  font-size: 1.0625rem;
  font-weight: 500;
  line-height: 1.75;
  letter-spacing: -0.01em;
  color: var(--color-text);
  margin-bottom: 12px;
}

.quote-text::before { content: '\201C'; }
.quote-text::after  { content: '\201D'; }

.quote-source {
  font-family: var(--font-en);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  letter-spacing: 0.03em;
}

.highlight-box {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  margin: 36px 0;
  background: var(--color-surface);
}

.highlight-box-title {
  font-family: var(--font-en);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  border: 1px solid var(--color-border);
  margin: 36px 0;
  background: var(--color-border);
}

.result-item {
  background: var(--color-bg);
  padding: 32px 24px;
  text-align: center;
}

.result-number {
  font-family: var(--font-en);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--color-text);
  margin-bottom: 8px;
  line-height: 1;
}

.result-number sup {
  font-size: 0.875rem;
  vertical-align: top;
  margin-top: 4px;
}

.result-label {
  font-family: var(--font-ja);
  font-size: 0.75rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

@media (max-width: 600px) {
  .result-grid { grid-template-columns: 1fr; }
}

.article-sidebar {
  position: sticky;
  top: 80px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.sidebar-toc {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  background: var(--color-surface);
}

.sidebar-toc-title {
  font-family: var(--font-en);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

.toc-list { display: flex; flex-direction: column; gap: 0; }

.toc-item { border-bottom: 1px solid var(--color-border); }
.toc-item:last-child { border-bottom: none; }

.toc-link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 0;
  font-family: var(--font-ja);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  transition: color var(--transition);
}

.toc-link:hover { color: var(--color-text); }

.toc-link::before {
  content: attr(data-n);
  font-family: var(--font-en);
  font-size: 0.625rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-border);
  flex-shrink: 0;
}

.sidebar-cta {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  background: var(--color-surface);
}

.sidebar-cta-label {
  font-family: var(--font-en);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 10px;
}

.sidebar-cta-text {
  font-family: var(--font-ja);
  font-size: 0.875rem;
  color: var(--color-text-sub);
  line-height: 1.7;
  margin-bottom: 16px;
}

.toc-inline { display: none; }

.toc-inline .toc-item { padding-left: 0; border-top: none; }
.toc-inline .toc-item:first-child { border-top: none; }
.toc-inline .toc-item::before { display: none; }
.toc-inline .toc-link { padding: 12px 0; }

@media (max-width: 900px) {
  .article-layout { grid-template-columns: 1fr; }
  .article-sidebar { display: none; }
  .toc-inline {
    display: block;
    margin-top: 28px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 28px 28px 8px;
    background: var(--color-surface);
  }
  .toc-inline .toc-list { margin-top: 0; }
  .toc-inline .sidebar-toc-title { margin-bottom: 0; }
  .toc-inline .toc-link { color: var(--color-text); }
  .toc-inline .toc-link::before { color: var(--color-text-muted); }
}

/* ============================================
   PLACEHOLDER COLORS
   ============================================ */
.placeholder-a { background: linear-gradient(135deg, #e8e7e1 0%, #d8d7cf 100%); }
.placeholder-b { background: linear-gradient(135deg, #e8edf5 0%, #d8e2ef 100%); }
.placeholder-c { background: linear-gradient(135deg, #ede8e1 0%, #e5d8cf 100%); }