:root {
  color-scheme: light;
  --bg: #f6f6f6;
  --panel: #ffffff;
  --border: #a7d7f9;
  --text: #202122;
  --muted: #54595d;
  --link: #0645ad;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", Arial, Helvetica, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: linear-gradient(180deg, #fff 0%, var(--bg) 100%);
}

.page-header,
main {
  width: calc(100% - 2rem);
  max-width: 1600px;
  margin: 0 auto;
}

main.content-grid {
  justify-items: center;
}

.page-header {
  padding: 2rem 0 1rem;
}

.site-label {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.8rem;
  color: var(--muted);
}

h1, h2, h3 {
  font-family: Georgia, "Times New Roman", serif;
  color: #000;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.35rem;
}

.lead {
  max-width: 760px;
  color: var(--muted);
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
  align-items: start;
}

.main-article,
.sidebar-card,
.wiki-page {
  background: var(--panel);
  border: 1px solid #d8d8d8;
  border-radius: 8px;
  padding: 1rem 1.2rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
  width: 100%;
  max-width: 1600px;
  margin: 0 auto;
}

.wiki-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1rem;
  width: 100%;
}

.wiki-card {
  display: block;
  text-decoration: none;
  color: inherit;
  border: 1px solid var(--border);
  background: #f9fcff;
  border-radius: 8px;
  padding: 0.9rem;
}

.wiki-card:hover {
  border-color: #2a4b8d;
  background: #eff6ff;
}

.wiki-card h3 {
  border-bottom: none;
  margin-top: 0;
  margin-bottom: 0.35rem;
}

.sidebar-card ul {
  padding-left: 1.1rem;
}

.wiki-page nav {
  margin-bottom: 1rem;
}

.wiki-page nav a {
  color: var(--link);
  text-decoration: none;
  margin-right: 0.75rem;
}

.wiki-page nav a:hover {
  text-decoration: underline;
}

.note-block {
  white-space: pre-wrap;
  word-break: break-word;
  background: #f8f8f8;
  border: 1px solid #ddd;
  border-radius: 6px;
  padding: 1rem;
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.95rem;
  line-height: 1.5;
}

@media (max-width: 900px) {
  .content-grid,
  .wiki-card-grid {
    grid-template-columns: 1fr;
  }
}