@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans+JP:wght@400;500;700&family=Source+Serif+4:opsz,wght@8..60,600;8..60,700&display=swap');

:root {
  --bg: #f6f4ef;
  --surface: #ffffff;
  --surface-soft: #fbfaf7;
  --ink: #222222;
  --ink-soft: #666666;
  --line: #e4e0d8;
  --accent: #1f4f8f;
  --accent-soft: #edf3fb;
  --shadow: 0 8px 24px rgba(20, 20, 20, 0.05);
  --radius-lg: 18px;
  --radius-md: 12px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'IBM Plex Sans JP', sans-serif;
  color: var(--ink);
  background: var(--bg);
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-underline-offset: 0.14em;
}

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

.site-shell {
  width: min(980px, calc(100% - 32px));
  margin: 0 auto;
  padding-bottom: 40px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  padding: 24px 0 20px;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
}

.brand-mark {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  overflow: hidden;
  flex: 0 0 auto;
  border: 1px solid var(--line);
  background: var(--surface);
}

.brand-mark img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.brand-copy strong {
  display: block;
  font-size: 1rem;
  letter-spacing: 0.01em;
}

.brand-copy span {
  display: block;
  color: var(--ink-soft);
  font-size: 0.88rem;
  margin-top: 2px;
}

.nav {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.nav a {
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 999px;
  color: var(--ink-soft);
  background: transparent;
  border: 1px solid transparent;
}

.nav a:hover,
.nav a.is-active {
  background: var(--surface);
  color: var(--ink);
  border-color: var(--line);
}

.hero {
  display: block;
  padding: 28px 0 10px;
}

.hero-panel,
.card,
.page-panel,
.article-layout,
.footer-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: none;
}

.hero-panel {
  padding: 28px;
  border-radius: var(--radius-lg);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.hero h1,
.article-header h1,
.page-panel h1 {
  font-family: 'Source Serif 4', serif;
  line-height: 1.22;
  margin: 16px 0 12px;
  max-width: none;
  text-wrap: pretty;
  word-break: normal;
  overflow-wrap: break-word;
  line-break: strict;
}

.hero h1 {
  font-size: clamp(2rem, 4vw, 3.25rem);
}

.hero p {
  color: var(--ink-soft);
  font-size: 1rem;
  line-height: 1.8;
  max-width: 54ch;
}

.badge-row,
.meta-row,
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.badge,
.meta-pill,
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border-radius: 999px;
  padding: 7px 12px;
  background: var(--surface-soft);
  border: 1px solid var(--line);
  color: var(--ink-soft);
  text-decoration: none;
}

.tag:hover {
  border-color: #cfd8e6;
  color: var(--ink);
}

.hero-aside {
  display: none;
}

.mini-stat {
  border-radius: var(--radius-lg);
  padding: 24px;
}

.mini-stat strong {
  display: block;
  font-size: 2rem;
  margin-top: 8px;
}

.section-head {
  display: block;
  margin: 30px 0 14px;
}

.section-head h2 {
  font-family: 'Source Serif 4', serif;
  margin: 0;
  font-size: clamp(1.5rem, 3vw, 2rem);
}

.section-head p {
  margin: 6px 0 0;
  color: var(--ink-soft);
}

.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.card {
  border-radius: var(--radius-md);
  padding: 20px;
  transition: border-color 160ms ease, background-color 160ms ease, transform 160ms ease;
}

.card-link {
  display: block;
  color: inherit;
  text-decoration: none;
}

.card-link:hover .card,
.card-link:focus-visible .card {
  border-color: #cfd8e6;
  background: #fcfcfa;
  transform: translateY(-1px);
}

.card-link:focus-visible {
  outline: none;
}

.card h3 {
  margin: 10px 0 8px;
  font-size: 1.15rem;
}

.card-media {
  margin: -20px -20px 14px;
  border-bottom: 1px solid var(--line);
  background: var(--surface-soft);
}

.card-media img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.card p,
.article-body p,
.page-panel p,
.page-panel li,
.article-body li {
  color: var(--ink-soft);
  line-height: 1.9;
}

.card .actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 14px;
  gap: 10px;
}

.card-readmore {
  color: var(--accent);
  font-weight: 600;
}

.button-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  border-radius: 999px;
  background: var(--surface-soft);
  color: var(--ink);
  padding: 10px 14px;
  font-weight: 600;
  border: 1px solid var(--line);
}

.muted {
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.article-layout {
  border-radius: var(--radius-lg);
  padding: 28px;
}

.article-summary {
  margin: 18px 0 22px;
  padding: 18px;
  border-radius: var(--radius-md);
  background: var(--surface-soft);
  border: 1px solid var(--line);
}

.article-summary h2 {
  margin: 0 0 10px;
  font-family: 'IBM Plex Sans JP', sans-serif;
  font-size: 0.95rem;
}

.article-summary p {
  margin: 0;
  color: var(--ink);
  line-height: 1.85;
}

.article-summary ul {
  margin: 12px 0 0;
  padding-left: 1.2rem;
}

.article-figure {
  margin: 0 0 20px;
}

.article-figure img {
  width: 100%;
  border-radius: var(--radius-md);
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--surface-soft);
}

.article-figure figcaption {
  margin-top: 8px;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.article-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 22px;
}

.article-header {
  margin-bottom: 26px;
}

.article-header h1 {
  font-size: clamp(1.9rem, 3.6vw, 2.8rem);
}

.article-body h2,
.article-body h3,
.page-panel h2,
.page-panel h3 {
  font-family: 'Source Serif 4', serif;
  margin: 30px 0 10px;
}

.article-body blockquote {
  margin: 22px 0;
  padding: 16px 18px;
  border-left: 3px solid var(--accent);
  background: var(--surface-soft);
  border-radius: 0 10px 10px 0;
}

.article-body pre {
  overflow-x: auto;
  background: #101521;
  color: #f5f5f5;
  padding: 18px;
  border-radius: 18px;
}

.article-body ul,
.article-body ol,
.page-panel ul {
  padding-left: 1.3rem;
}

.toc,
.source-list,
.side-card {
  border-radius: var(--radius-md);
  padding: 18px;
  background: var(--surface-soft);
  border: 1px solid var(--line);
  margin-bottom: 16px;
}

.toc h3,
.source-list h3,
.side-card h3 {
  margin-top: 0;
}

.toc ol,
.source-list ol {
  margin: 0;
  padding-left: 1.2rem;
}

.legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.footer-panel {
  margin-top: 24px;
  border-radius: var(--radius-lg);
  padding: 20px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.footer-grid p {
  color: var(--ink-soft);
  margin: 8px 0 0;
}

@media (max-width: 920px) {
  .hero,
  .article-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .site-shell {
    width: min(100% - 24px, 1180px);
  }

  .hero-panel,
  .article-layout,
  .footer-panel {
    padding: 24px;
  }
}

@media (max-width: 640px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

}