/* =============================================
   Japan Encyclopedia — Dynamic Article Style
   Washi paper / indigo / vermillion matching index.html
   ============================================= */
:root {
  --bg: #faf8f5;
  --bg-card: #f5f1eb;
  --indigo: #1b2838;
  --indigo-light: #2d3f55;
  --vermillion: #c73e1d;
  --vermillion-light: #e05530;
  --sage: #6b7f5e;
  --gold: #b8860b;
  --gold-light: #d4a017;
  --text: #2c2c2c;
  --text-light: #5a5a5a;
  --border: #d8cfc4;
  --font-jp: 'Noto Serif JP', serif;
  --font-en: 'Cormorant Garamond', serif;
  --font-body: 'Source Sans 3', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.8;
}

/* Washi paper texture */
body::before {
  content: '';
  position: fixed; inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='400' height='400'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='400' height='400' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none; z-index: 0; opacity: 0.4;
}

/* NAV */
.article-nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(27,40,56,0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(184,134,11,0.3);
  padding: 0 2rem;
}
.article-nav-inner {
  max-width: 860px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  height: 52px;
}
.article-nav a {
  color: rgba(255,255,255,0.7); text-decoration: none;
  font-size: 0.85rem; font-family: var(--font-jp);
  transition: color 0.2s;
}
.article-nav a:hover { color: var(--gold-light); }
.article-nav .nav-site {
  font-weight: 600; color: #fff; letter-spacing: 0.05em;
}

/* ARTICLE CONTAINER */
.article-container {
  position: relative; z-index: 1;
  max-width: 860px; margin: 0 auto;
  padding: 3rem 2rem 4rem;
}

/* META */
.article-meta {
  display: flex; gap: 1.2rem; flex-wrap: wrap;
  font-size: 0.8rem; color: var(--text-light);
  margin-bottom: 2rem; letter-spacing: 0.05em;
  font-family: var(--font-body);
}

/* TITLE */
.article-title {
  font-family: var(--font-jp);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 600; color: var(--indigo);
  margin-bottom: 1rem; line-height: 1.3;
}

/* DESCRIPTION */
.article-desc {
  font-size: 1rem; color: var(--text-light);
  margin-bottom: 2.5rem; padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
  line-height: 1.8;
}

/* CONTENT */
.article-content h2 {
  font-family: var(--font-jp);
  font-size: 1.5rem; color: var(--vermillion);
  margin: 2.5rem 0 1rem; font-weight: 600;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border);
}
.article-content h3 {
  font-family: var(--font-jp);
  font-size: 1.2rem; color: var(--indigo);
  margin: 2rem 0 0.8rem; font-weight: 600;
}
.article-content p { margin-bottom: 1.2rem; }
.article-content ul, .article-content ol {
  margin: 0.8rem 0 1.2rem 1.5rem;
}
.article-content li { margin-bottom: 0.4rem; }
.article-content strong { color: var(--indigo); }
.article-content a {
  color: var(--vermillion); text-decoration: underline;
  text-underline-offset: 3px;
}
.article-content blockquote {
  border-left: 3px solid var(--vermillion);
  padding: 1rem 1.5rem; margin: 1.5rem 0;
  background: var(--bg-card); border-radius: 0 6px 6px 0;
  font-style: italic; color: var(--text-light);
}

/* FAQ */
.faq-section { margin-top: 3rem; }
.faq-section h2 {
  font-family: var(--font-jp);
  font-size: 1.4rem; color: var(--vermillion);
  margin-bottom: 1.5rem;
}
.faq-item {
  border: 1px solid var(--border); border-radius: 6px;
  margin-bottom: 0.8rem; overflow: hidden;
  background: #fff;
}
.faq-q {
  width: 100%; padding: 1rem 1.4rem;
  background: #fff; border: none; color: var(--indigo);
  font-size: 0.95rem; font-family: var(--font-jp);
  cursor: pointer; display: flex; justify-content: space-between;
  align-items: center; text-align: left;
}
.faq-q:hover { background: var(--bg-card); }
.faq-q .toggle { color: var(--vermillion); font-size: 1.2rem; flex-shrink: 0; }
.faq-a {
  padding: 0 1.4rem; max-height: 0; overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  color: var(--text-light); font-size: 0.9rem; line-height: 1.7;
}
.faq-item.open .faq-a { max-height: 300px; padding: 1rem 1.4rem; }
.faq-item.open .toggle { transform: rotate(45deg); }

/* CONTEXTUAL LINKS */
.contextual-links {
  margin-top: 2.5rem; padding: 1.5rem;
  background: linear-gradient(135deg, var(--bg-card), rgba(199,62,29,0.03));
  border: 1px solid var(--border); border-radius: 8px;
}
.contextual-links h4 {
  font-family: var(--font-jp);
  font-size: 0.9rem; color: var(--vermillion); margin-bottom: 1rem;
}
.contextual-links ul { list-style: none; padding: 0; }
.contextual-links li {
  margin-bottom: 0.5rem; font-size: 0.85rem; color: var(--text-light);
}
.contextual-links a { color: var(--vermillion); text-decoration: none; }
.contextual-links a:hover { text-decoration: underline; }

/* SPIDER WEB */
.ecosystem-footer {
  margin-top: 3rem; padding: 2rem;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 8px;
}
.ecosystem-footer h3 {
  font-family: var(--font-jp);
  font-size: 0.85rem; color: var(--gold);
  letter-spacing: 0.1em; margin-bottom: 1rem;
}
.ecosystem-links {
  display: flex; flex-wrap: wrap; gap: 0.6rem;
}
.ecosystem-links a {
  color: var(--text-light); text-decoration: none;
  font-size: 0.78rem; font-family: var(--font-jp);
  padding: 0.3rem 0.8rem;
  border: 1px solid var(--border); border-radius: 3px;
  transition: all 0.2s;
}
.ecosystem-links a:hover {
  border-color: var(--vermillion); color: var(--vermillion);
}

/* ARTICLE FOOTER */
.article-footer {
  margin-top: 3rem; padding-top: 2rem;
  border-top: 1px solid var(--border);
  text-align: center;
}
.article-footer p {
  font-size: 0.78rem; color: var(--text-light);
}
.article-footer a { color: var(--vermillion); text-decoration: none; }

/* RESPONSIVE */
@media (max-width: 768px) {
  .article-container { padding: 2rem 1.2rem 3rem; }
  .article-nav-inner { padding: 0 0.5rem; }
}

/* Google Fonts import for article pages */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+JP:wght@300;400;600;700&family=Cormorant+Garamond:ital,wght@0,300;0,400;0,600;1,300;1,400&family=Source+Sans+3:wght@300;400;600&display=swap');