/* Nava 🧭 — Visual Knowledge Explorer */

.nava-layout {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 56px);
  padding: 24px;
  overflow-y: auto;
  gap: 20px;
}

.nava-header {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.nava-header h2 {
  margin: 0;
  font-size: 24px;
  color: var(--text-primary);
}

.nava-search {
  flex: 1;
  min-width: 200px;
  max-width: 400px;
}

.nava-search input {
  width: 100%;
  padding: 10px 16px;
  border-radius: 24px;
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}

.nava-search input:focus {
  border-color: var(--accent);
}

.nava-search input::placeholder {
  color: var(--text-muted);
}

/* Filter bar */
.nava-filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.nava-filter-btn {
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.nava-filter-btn:hover {
  border-color: var(--accent);
  color: var(--text-primary);
}

.nava-filter-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* Card board — masonry-like grid */
.nava-board {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.nava-card {
  background: var(--bg-secondary);
  border-radius: 12px;
  padding: 20px;
  cursor: pointer;
  position: relative;
  border: 1px solid var(--border);
  border-top: 3px solid var(--card-accent, var(--accent));
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.nava-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.15);
  border-color: var(--card-accent, var(--accent));
}

.nava-card.pinned {
  border-top-width: 4px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.1);
}

.nava-card.pinned::before {
  content: '';
  position: absolute;
  top: -2px;
  right: 12px;
  width: 2px;
  height: 16px;
  background: var(--card-accent);
  border-radius: 0 0 2px 2px;
}

.nava-card-pin {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
  opacity: 0.4;
  background: transparent;
}

.nava-card:hover .nava-card-pin,
.nava-card.pinned .nava-card-pin {
  opacity: 1;
}

.nava-card-pin:hover {
  background: var(--bg-tertiary, rgba(255,255,255,0.1));
  transform: scale(1.2);
}

.nava-card-category {
  display: flex;
  gap: 6px;
}

.nava-tag {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 12px;
  letter-spacing: 0.3px;
  text-transform: uppercase;
}

.nava-card-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
}

.nava-card-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.nava-card-type {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: auto;
  padding-top: 8px;
  border-top: 1px solid var(--border);
}

.nava-empty {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
  font-size: 15px;
}

/* Overlay reader */
.nava-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.nava-overlay.active {
  display: flex;
}

.nava-reader {
  background: var(--bg-primary);
  border-radius: 16px;
  max-width: 800px;
  width: 100%;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0 24px 64px rgba(0,0,0,0.3);
  animation: slideUp 0.25s ease;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

.nava-reader-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg-primary);
  z-index: 1;
}

.nava-close {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: none;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.nava-close:hover {
  background: var(--border);
}

.nava-reader-body {
  padding: 24px;
}

.nava-reader-body h1 { font-size: 24px; margin-top: 0; }
.nava-reader-body h2 { font-size: 20px; }
.nava-reader-body h3 { font-size: 17px; }
.nava-reader-body p { line-height: 1.7; color: var(--text-secondary); }
.nava-reader-body code { background: var(--bg-secondary); padding: 2px 6px; border-radius: 4px; font-size: 13px; }
.nava-reader-body table { width: 100%; border-collapse: collapse; }
.nava-reader-body th, .nava-reader-body td { padding: 8px 12px; border: 1px solid var(--border); text-align: left; }
.nava-reader-body th { background: var(--bg-secondary); font-weight: 600; }

/* Mobile */
@media (max-width: 768px) {
  .nava-layout { padding: 16px; }
  .nava-header { flex-direction: column; align-items: stretch; }
  .nava-search { max-width: none; }
  .nava-board { grid-template-columns: 1fr; }
  .nava-reader { max-height: 90vh; margin: 8px; }
}