/* TechForge — platform features (search, continue learning, hub grids) */
.tf-search-trigger {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--text3);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 12px;
  cursor: pointer;
  transition: all .15s;
  margin-right: 8px;
}
.tf-search-trigger:hover { border-color: var(--border2); color: var(--text); }
.tf-search-trigger kbd {
  font-size: 9px;
  padding: 2px 5px;
  border-radius: 4px;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text3);
}
.tf-search-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(3,5,8,.75);
  backdrop-filter: blur(8px);
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding: 80px 16px 24px;
}
.tf-search-overlay.open { display: flex; }
.tf-search-panel {
  width: min(560px, 100%);
  background: var(--bg2);
  border: 1px solid var(--border2);
  border-radius: var(--r-xl);
  box-shadow: 0 24px 80px rgba(0,0,0,.5);
  overflow: hidden;
}
.tf-search-input-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}
.tf-search-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  font-size: 16px;
  color: var(--text);
  font-family: var(--font-body);
}
.tf-search-input::placeholder { color: var(--text3); }
.tf-search-results { max-height: 360px; overflow-y: auto; padding: 8px; }
.tf-search-empty {
  padding: 24px;
  text-align: center;
  font-size: 13px;
  color: var(--text3);
}
.tf-search-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--r-md);
  text-decoration: none;
  color: inherit;
  transition: background .12s;
}
.tf-search-item:hover, .tf-search-item.focused { background: var(--surface); }
.tf-search-item-icon { font-size: 18px; flex-shrink: 0; }
.tf-search-item-body { min-width: 0; }
.tf-search-item-title { font-size: 13px; font-weight: 700; color: var(--text); }
.tf-search-item-meta { font-family: var(--font-mono); font-size: 10px; color: var(--text3); margin-top: 2px; }
.tf-continue-bar {
  background: linear-gradient(90deg, rgba(0,212,255,.06), transparent);
  border-bottom: 1px solid var(--border);
  padding: 8px 20px;
  display: none;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--text2);
}
.tf-continue-bar.visible { display: flex; }
.tf-continue-bar a { color: var(--cyan); font-weight: 700; text-decoration: none; }
.tf-continue-bar a:hover { text-decoration: underline; }
.tf-continue-dismiss {
  margin-left: auto;
  background: none;
  border: none;
  color: var(--text3);
  cursor: pointer;
  font-size: 16px;
  padding: 4px 8px;
}
.hub-category { margin-bottom: 36px; }
.hub-category-head {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text3);
  margin-bottom: 14px;
  font-weight: 700;
}
.hub-topic-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
}
.hub-topic-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: 20px 18px;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: border-color .18s, transform .18s, box-shadow .18s;
  position: relative;
  overflow: hidden;
}
.hub-topic-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
  opacity: 0.55;
}
.hub-topic-card:hover {
  border-color: var(--border2);
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.25);
}
.hub-topic-card.full {
  border-color: color-mix(in srgb, var(--accent) 25%, var(--border));
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 4%, transparent), transparent);
}
.hub-topic-card .htc-icon { font-size: 24px; line-height: 1; }
.hub-topic-card .htc-title { font-size: 14px; font-weight: 700; color: var(--text); letter-spacing: -0.01em; }
.hub-topic-card .htc-desc { font-size: 12.5px; color: var(--text3); line-height: 1.6; flex: 1; }
.hub-topic-card .htc-meta {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text3);
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 6px;
}
.hub-topic-card .htc-badge {
  font-size: 8px;
  padding: 3px 7px;
  border-radius: 4px;
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  color: var(--accent);
  font-weight: 700;
  letter-spacing: .04em;
}

/* Legacy layout (.pg-head) learning actions — matches lesson template */
.tf-learning-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.tf-learning-actions .lesson-meta-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text3);
  padding: 5px 10px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: var(--surface);
}
.pg-head .tf-learning-actions {
  margin-top: 12px;
}
.dsa-hero + .tf-learning-actions,
.page-hero + .tf-learning-actions {
  margin: 16px 0 28px;
}
@media (max-width: 600px) {
  .tf-search-trigger span:not(.tf-search-icon) { display: none; }
  .tf-search-trigger kbd { display: none; }
  .tf-search-trigger { padding: 8px 10px; min-width: 44px; justify-content: center; }
  .topbar-actions { gap: 4px !important; }
  .hub-topic-grid { grid-template-columns: 1fr; }
}