/* ============================================
   Ontology incubation NEWS
   Design: matches ontology-incubation.netlify.app
   ============================================ */

:root {
  --black:  #111111;
  --white:  #ffffff;
  --gray:   #666666;
  --light:  #f5f5f5;
  --border: #dddddd;
  --font:   'Hiragino Sans', 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 15px; scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--black);
  background: var(--white);
  line-height: 1.65;
}

a { color: var(--black); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Nav ──────────────────────────────────── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 100;
}

nav .logo {
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--black);
}

nav .logo .badge {
  display: inline-block;
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  border: 1px solid var(--black);
  padding: 0.1rem 0.45rem;
  margin-left: 0.4rem;
  vertical-align: middle;
  text-transform: uppercase;
}

nav .nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

nav .nav-links a {
  font-size: 0.78rem;
  color: var(--gray);
  letter-spacing: 0.05em;
}

nav .nav-links a:hover { color: var(--black); text-decoration: none; }

/* ── Layout ───────────────────────────────── */
.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ── Hero (index) ─────────────────────────── */
.hero {
  padding-top: 6rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 3rem;
}

.hero .label {
  font-size: 0.68rem;
  letter-spacing: 0.15em;
  color: var(--gray);
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.hero p {
  font-size: 0.95rem;
  color: var(--gray);
  max-width: 500px;
  line-height: 1.75;
}

/* ── Article List ─────────────────────────── */
.article-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  padding-bottom: 5rem;
}

.article-card {
  display: block;
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--border);
  color: inherit;
  transition: background 0.15s;
}

.article-card:hover { text-decoration: none; background: var(--light); padding-left: 0.75rem; padding-right: 0.75rem; margin: 0 -0.75rem; }

.article-card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
}

.article-card-date {
  font-size: 0.75rem;
  color: var(--gray);
  letter-spacing: 0.03em;
  font-variant-numeric: tabular-nums;
}

.tag {
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 1px solid var(--border);
  padding: 0.1rem 0.5rem;
  color: var(--gray);
}

.article-card h2 {
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.45;
  margin-bottom: 0.35rem;
  letter-spacing: -0.01em;
}

.article-card p {
  font-size: 0.875rem;
  color: var(--gray);
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ── Article Page ─────────────────────────── */
.page-top {
  padding-top: 5rem;
}

.article-header {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2.5rem;
}

.article-header-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

.article-header h1 {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.article-header-desc {
  font-size: 0.95rem;
  color: var(--gray);
  max-width: 580px;
  line-height: 1.75;
}

/* ── Article Body ─────────────────────────── */
.article-body {
  padding-bottom: 5rem;
}

.article-body h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 2.5rem 0 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
  letter-spacing: -0.01em;
}

.article-body h3 {
  font-size: 1rem;
  font-weight: 700;
  margin: 1.75rem 0 0.5rem;
}

.article-body p {
  font-size: 0.95rem;
  color: #333;
  margin-bottom: 1rem;
  line-height: 1.8;
}

.article-body ul,
.article-body ol {
  padding-left: 1.4rem;
  margin-bottom: 1rem;
}

.article-body li {
  font-size: 0.95rem;
  color: #333;
  margin-bottom: 0.35rem;
  line-height: 1.75;
}

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

.article-body blockquote {
  border-left: 3px solid var(--black);
  padding: 0.75rem 1.25rem;
  margin: 1.5rem 0;
  background: var(--light);
}

.article-body blockquote p {
  margin-bottom: 0;
  font-size: 0.95rem;
  color: var(--black);
}

.article-body pre {
  background: var(--light);
  border: 1px solid var(--border);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.7;
  color: #333;
}

.article-body code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--light);
  padding: 0.15em 0.4em;
  border: 1px solid var(--border);
}

.article-body pre code {
  background: none;
  padding: 0;
  border: none;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.88rem;
}

.article-body th {
  background: var(--light);
  border: 1px solid var(--border);
  padding: 0.55rem 0.9rem;
  text-align: left;
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--gray);
}

.article-body td {
  border: 1px solid var(--border);
  padding: 0.55rem 0.9rem;
  color: #333;
}

.article-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

.article-body .callout {
  background: var(--light);
  border: 1px solid var(--border);
  border-left: 3px solid var(--black);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
}

.article-body .callout p { margin-bottom: 0.5rem; }
.article-body .callout p:last-child { margin-bottom: 0; }

/* ── Back link ────────────────────────────── */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.78rem;
  color: var(--gray);
  letter-spacing: 0.05em;
  margin-bottom: 0;
  transition: color 0.15s;
  padding-top: 5rem;
  padding-bottom: 0;
  display: block;
}

.back-link:hover { color: var(--black); text-decoration: none; }

/* ── Footer ───────────────────────────────── */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

footer .footer-logo {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

footer .footer-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

footer .footer-links a {
  font-size: 0.75rem;
  color: var(--gray);
  letter-spacing: 0.03em;
}

footer .footer-links a:hover { color: var(--black); text-decoration: none; }

footer .footer-copy {
  font-size: 0.72rem;
  color: var(--gray);
  width: 100%;
}

/* ── Responsive ───────────────────────────── */
@media (max-width: 600px) {
  nav { padding: 0 1rem; }
  .container { padding: 0 1.25rem; }
  .hero { padding-top: 5rem; }
  .hero h1 { font-size: 1.5rem; }
  .article-header h1 { font-size: 1.35rem; }
  footer { padding: 1.5rem 1.25rem; }
}