/* Global reset */
* { box-sizing: border-box; }
html { font-size: 16px; }

body {
  margin: 0;
  padding: 0;
  background: #f8f9fa;
  color: #1a1a1a;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

/* ---- Navigation ---- */
#topNav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 24px;
  height: 54px;
  background: #fff;
  border-bottom: 1px solid #ddd;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.nav-brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: #1a1a1a;
  margin-right: 12px;
  white-space: nowrap;
}

.nav-tabs {
  display: flex;
  gap: 4px;
}

.tab-btn {
  background: transparent;
  border: none;
  color: #666;
  font-size: 0.9rem;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  width: auto;
  height: auto;
  display: inline-flex;
}

.tab-btn:hover { background: #f0f0f0; color: #333; }
.tab-btn.active { background: #e8e8e8; color: #111; }

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

.nav-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: #444;
  text-decoration: none;
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 500;
  padding: 5px 12px;
  border-radius: 6px;
  border: 1px solid #ddd;
  background: #f8f9fa;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.nav-badge:hover {
  background: #eef0f3;
  border-color: #bbb;
}

.nav-icon {
  height: 16px;
  width: auto;
}

/* ---- Tab panels ---- */
main { padding: 24px 32px; }

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.tab-subtitle {
  color: #666;
  margin-top: 0;
  margin-bottom: 20px;
  font-size: 0.95rem;
}

/* ---- About / Overview page ---- */
.about-content {
  max-width: 900px;
  margin: 0 auto;
}

.about-content h2 {
  text-align: center;
  margin-top: 0;
  font-size: 1.5rem;
  color: #1a1a1a;
}

.venue-tag {
  font-size: 0.75em;
  font-weight: 600;
  color: #2563b1;
  white-space: nowrap;
}

.about-badges {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 28px;
}

.about-section {
  margin-bottom: 32px;
}

.about-section h3 {
  text-align: center;
  font-size: 1.15rem;
  margin-bottom: 8px;
  color: #333;
}

.about-section p,
.about-section li {
  line-height: 1.7;
  color: #444;
}

.about-section ul {
  padding-left: 20px;
}

.about-section a {
  color: #2563b1;
}

.tier-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.tier-card {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 16px;
}

.tier-card h4 {
  margin: 0 0 6px;
  font-size: 0.95rem;
  color: #1a1a1a;
}

.tier-card p {
  margin: 0;
  font-size: 0.9rem;
  color: #555;
}

.game-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
}

.game-card {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 8px;
  padding: 14px;
}

.game-card strong { color: #1a1a1a; }

.game-card p {
  margin: 4px 0 0;
  font-size: 0.85rem;
  color: #555;
}

.overview-img {
  display: block;
  width: 100%;
  max-width: 900px;
  height: auto;
  border-radius: 8px;
  border: 1px solid #ddd;
  margin: 12px auto;
}

.overview-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin: 12px auto;
}

.overview-table th,
.overview-table td {
  padding: 8px 12px;
  border: 1px solid #ddd;
  text-align: left;
}

.overview-table th {
  background: #f0f2f5;
  font-weight: 600;
  color: #333;
}

.overview-table td {
  color: #444;
}

.citation-block {
  background: #f0f2f5;
  padding: 16px;
  border-radius: 8px;
  border: 1px solid #ddd;
  font-size: 0.85rem;
  color: #333;
  overflow-x: auto;
  white-space: pre;
}

/* ---- BibTeX button & modal ---- */
.bibtex-modal {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.4);
  z-index: 200;
  justify-content: center;
  align-items: center;
}

.bibtex-modal.open {
  display: flex;
}

.bibtex-modal-content {
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.18);
  padding: 24px;
  max-width: 640px;
  width: 90%;
}

.bibtex-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
  font-weight: 600;
  font-size: 1rem;
  color: #1a1a1a;
}

.bibtex-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: #666;
  padding: 0 4px;
  line-height: 1;
}

.bibtex-close:hover { color: #111; }

.bibtex-code {
  background: #f0f2f5;
  padding: 16px;
  border-radius: 8px;
  border: 1px solid #ddd;
  font-size: 0.82rem;
  color: #333;
  overflow-x: auto;
  white-space: pre;
  margin: 0 0 12px;
}

.bibtex-copy-btn {
  display: block;
  margin: 0 auto;
  padding: 8px 20px;
  background: #2563b1;
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 0.88rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s;
}

.bibtex-copy-btn:hover { background: #1d4f91; }

/* ---- Responsive ---- */
@media (max-width: 700px) {
  #topNav { flex-wrap: wrap; height: auto; padding: 10px 16px; }
  .nav-tabs { width: 100%; justify-content: center; }
  .nav-links { width: 100%; justify-content: center; }
  main { padding: 16px; }
}