/* Hub-page styles (TOP, /jp/, /jp/13/, /jp/13/131156/, /topics/, /about/).
 * Dark UI; no map. Lighter than article.css because hubs have no scrolly. */

:root {
  --fg: #ececec; --muted: #b0b0b0; --bg: #15171a;
  --card-bg: #1c1e21; --border: #2c2f33; --code-bg: #25282c;
  --accent: #90caf9;
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  font-family: "Hiragino Mincho ProN", "Yu Mincho", "Noto Serif JP", serif;
  color: var(--fg); background: var(--bg); line-height: 1.75;
}
a { color: var(--accent); }

.wrap { max-width: 880px; margin: 0 auto; padding: 3rem 1.5rem 4rem; }

/* Breadcrumb (top of every hub page) */
nav.crumb {
  font-family: -apple-system, sans-serif; font-size: 0.82rem;
  color: var(--muted); margin-bottom: 1.5rem;
}
nav.crumb a { color: var(--muted); text-decoration: none; }
nav.crumb a:hover { color: var(--accent); text-decoration: underline; }
nav.crumb span[aria-current] { color: var(--fg); }

header h1 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  margin: 0 0 1rem; letter-spacing: -0.02em; line-height: 1.35;
}
header .meta { font-family: -apple-system, sans-serif; font-size: 0.85rem; color: var(--muted); }
header p.lede { margin-top: 1.5rem; color: var(--fg); font-size: 1.05rem; }

section { margin-top: 2.5rem; }
section h2 { font-size: 1.3rem; margin: 0 0 1rem; letter-spacing: -0.01em; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 14px;
}
.card {
  display: block;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-left: 4px solid var(--card-accent, var(--accent));
  padding: 1.1rem 1.25rem 1.2rem;
  border-radius: 6px;
  text-decoration: none;
  color: var(--fg);
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(0,0,0,0.3);
  border-color: var(--card-accent, var(--accent));
}
.card .topic, .card .place {
  font-family: -apple-system, sans-serif;
  font-size: 0.78rem; color: var(--muted);
  letter-spacing: 0.05em; margin-bottom: 0.35rem;
}
.card h3 {
  font-size: 1.15rem; margin: 0 0 0.55rem;
  letter-spacing: -0.01em; line-height: 1.45;
}
.card h3 strong { color: var(--card-accent, var(--accent)); }
.card p { margin: 0 0 0.7rem; font-size: 0.92rem; color: var(--fg); }
.card .meta-row {
  display: flex; flex-wrap: wrap; align-items: center; gap: 6px 8px;
  padding-top: 0.6rem; border-top: 1px solid var(--border);
  font-family: -apple-system, sans-serif; font-size: 0.74rem; color: var(--muted);
}
.card .theme-chip {
  background: var(--code-bg); padding: 1px 7px; border-radius: 10px;
}

.site-footer {
  margin-top: 3.5rem; padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-family: -apple-system, sans-serif; font-size: 0.82rem; color: var(--muted);
}
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--accent); }

/* === Discovery TOP — search bar, scope tabs, theme chips === */
.search-block {
  margin: 1.5rem 0 2.5rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.2rem;
}
.search-block input[type="search"] {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--fg);
  font-size: 1rem; padding: 0.7rem 0.9rem;
  border-radius: 6px;
  font-family: inherit;
}
.search-block input[type="search"]::placeholder { color: var(--muted); }
.search-block input[type="search"]:focus {
  outline: none; border-color: var(--accent);
}
.search-results {
  margin-top: 0.8rem;
  font-family: -apple-system, sans-serif; font-size: 0.92rem;
}
.search-results .hit {
  display: block; padding: 0.5rem 0.4rem;
  border-bottom: 1px solid var(--border);
  text-decoration: none; color: var(--fg);
}
.search-results .hit:last-child { border-bottom: none; }
.search-results .hit:hover { background: var(--code-bg); color: var(--accent); }
.search-results .hit .place {
  font-size: 0.74rem; color: var(--muted); margin-right: 0.5rem;
}
.search-results .empty { color: var(--muted); padding: 0.5rem; }

.filter-bar {
  display: flex; flex-wrap: wrap; gap: 6px;
  margin: 0.5rem 0 1.5rem;
  font-family: -apple-system, sans-serif;
}
.filter-bar .chip {
  background: var(--code-bg);
  border: 1px solid transparent;
  color: var(--muted);
  padding: 4px 11px; border-radius: 14px;
  font-size: 12px; cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.filter-bar .chip:hover { color: var(--fg); }
.filter-bar .chip.active {
  background: var(--accent); color: var(--bg); border-color: var(--accent);
}
.filter-bar .chip-group-label {
  font-size: 11px; color: var(--muted);
  align-self: center; margin-right: 4px; letter-spacing: 0.05em;
}
.filter-bar .sep {
  width: 1px; background: var(--border); margin: 4px 8px;
}

/* Scope sections on TOP */
.scope { margin-bottom: 2rem; }
.scope-head { display: flex; align-items: baseline; gap: 10px; margin-bottom: 0.8rem; }
.scope-head h2 { font-size: 1.05rem; margin: 0; }
.scope-head .count { color: var(--muted); font-size: 0.82rem; font-variant-numeric: tabular-nums; }
.scope-empty {
  color: var(--muted); font-size: 0.88rem;
  padding: 0.8rem 1rem;
  border: 1px dashed var(--border); border-radius: 6px;
}

@media (max-width: 600px) {
  .wrap { padding: 2rem 1rem 3rem; }
  .grid { grid-template-columns: 1fr; }
}