/* ===== Workspace Header ===== */
.workspace-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-4);
  flex-wrap: wrap;
  gap: var(--sp-3);
}
.workspace-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--gray-900);
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}
.workspace-title .title-icon {
  display: flex;
  align-items: center;
  color: var(--brand);
}
.workspace-actions {
  display: flex;
  gap: var(--sp-2);
  align-items: center;
}

/* ===== Filter Bar ===== */
.filter-bar {
  display: flex;
  gap: var(--sp-2);
  margin-bottom: var(--sp-4);
  flex-wrap: wrap;
  align-items: center;
}
.filter-bar label {
  font-size: 0.8rem;
  color: var(--gray-500);
  font-weight: 500;
}
.filter-bar select {
  padding: 5px 10px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  background: white;
  color: var(--gray-700);
  transition: border-color var(--transition-fast);
  cursor: pointer;
}
.filter-bar select:hover { border-color: var(--gray-300); }
.filter-bar select:focus { border-color: var(--brand-300); box-shadow: var(--focus-ring); outline: none; }

/* ===== Tag Chips ===== */
.tag-filters {
  display: flex;
  gap: var(--sp-1);
  flex-wrap: wrap;
}
.tag-chip {
  padding: 3px 12px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid var(--gray-200);
  background: white;
  color: var(--gray-600);
  transition: all var(--transition-fast);
}
.tag-chip:hover {
  border-color: var(--brand-300);
  color: var(--brand);
  background: var(--brand-50);
}
.tag-chip.active {
  background: var(--brand);
  color: white;
  border-color: var(--brand);
  box-shadow: 0 1px 3px rgba(99,102,241,0.3);
}

/* ===== Card Grid ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--sp-3);
}

/* ===== Document Card ===== */
.doc-card {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  padding: var(--sp-4);
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
}
.doc-card:hover {
  border-color: var(--brand-200);
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}
.doc-card.selected {
  border-color: var(--brand);
  background: var(--brand-50);
  box-shadow: 0 0 0 1px var(--brand-200);
}

/* Checkbox: hidden by default, shown on hover */
.doc-card .card-checkbox {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 16px;
  height: 16px;
  cursor: pointer;
  accent-color: var(--brand);
  opacity: 0;
  transition: opacity var(--transition-fast);
}
.doc-card:hover .card-checkbox,
.doc-card.selected .card-checkbox {
  opacity: 1;
}

.doc-card .card-icon {
  display: flex;
  align-items: center;
  color: var(--gray-400);
  margin-bottom: var(--sp-2);
}
.doc-card .card-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: var(--sp-1);
  line-height: 1.4;
  overflow: hidden;
  text-overflow: ellipsis;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.doc-card .card-filename {
  font-size: 0.73rem;
  color: var(--gray-400);
  margin-bottom: var(--sp-2);
  font-family: var(--font-mono);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.doc-card .card-tags {
  display: flex;
  gap: var(--sp-1);
  flex-wrap: wrap;
  margin-bottom: var(--sp-2);
}
.doc-card .card-tag {
  font-size: 0.7rem;
  font-weight: 500;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--gray-100);
  color: var(--gray-600);
}
.doc-card .card-stats {
  display: flex;
  gap: var(--sp-3);
  font-size: 0.72rem;
  color: var(--gray-400);
}
.doc-card .card-stats span {
  display: flex;
  align-items: center;
  gap: 3px;
}
.doc-card .card-date {
  font-size: 0.7rem;
  color: var(--gray-400);
  margin-top: var(--sp-2);
}

/* ===== Upload Zone ===== */
.upload-zone {
  border: 2px dashed var(--gray-300);
  border-radius: var(--radius-lg);
  padding: var(--sp-10) var(--sp-5);
  text-align: center;
  color: var(--gray-400);
  cursor: pointer;
  transition: all var(--transition);
  margin-bottom: var(--sp-4);
  background: var(--gray-50);
}
.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--brand-300);
  background: var(--brand-50);
  color: var(--brand);
}
.upload-zone-icon {
  margin-bottom: var(--sp-2);
  display: flex;
  justify-content: center;
  color: var(--gray-300);
}
.upload-zone:hover .upload-zone-icon,
.upload-zone.dragover .upload-zone-icon {
  color: var(--brand-400);
}
.upload-zone-text { font-size: 0.9rem; font-weight: 500; }
.upload-zone-sub { font-size: 0.78rem; margin-top: var(--sp-1); opacity: 0.7; }
.upload-zone input[type="file"] { display: none; }

/* ===== Empty State ===== */
.empty-state {
  text-align: center;
  padding: var(--sp-16) var(--sp-5);
  color: var(--gray-400);
}
.empty-state-icon {
  margin-bottom: var(--sp-3);
  display: flex;
  justify-content: center;
  color: var(--gray-300);
}
.empty-state-text {
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: var(--sp-1);
  color: var(--gray-500);
}
.empty-state-sub {
  font-size: 0.85rem;
  color: var(--gray-400);
}