.drawer-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.25);
  z-index: 10;
}

.drawer {
  position: absolute;
  top: 0;
  right: 0;
  width: min(420px, 100%);
  height: 100%;
  z-index: 11;
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border-left: 1px solid var(--color-border);
  box-shadow: -4px 0 16px rgba(15, 23, 42, 0.1);
}

.drawer-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
}

.drawer-header h3 {
  margin: 0;
  font-size: 1rem;
  line-height: 1.4;
}

.drawer-close {
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  border: none;
  border-radius: var(--radius);
  background: var(--color-bg);
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
}

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

.drawer-body {
  flex: 1;
  overflow-y: auto;
  padding: 1rem 1.25rem;
}

.drawer-type {
  display: inline-block;
  margin-bottom: 0.75rem;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.drawer-type.paper { background: #dbeafe; color: var(--color-paper); }
.drawer-type.concept { background: #dcfce7; color: var(--color-concept); }
.drawer-type.tool { background: #ffedd5; color: var(--color-tool); }
.drawer-type.text { background: var(--color-bg); color: var(--color-muted); }

.drawer-meta {
  margin: 0 0 0.75rem;
  font-size: 0.85rem;
  color: var(--color-muted);
}

.drawer-desc {
  margin: 0 0 1rem;
  font-size: 0.9rem;
  line-height: 1.55;
}

.drawer-section h4 {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-muted);
}

.drawer-papers {
  list-style: none;
  margin: 0;
  padding: 0;
}

.drawer-papers li {
  margin-bottom: 0.5rem;
  font-size: 0.85rem;
}

.drawer-papers a {
  color: var(--color-primary);
  text-decoration: none;
}

.drawer-papers a:hover {
  text-decoration: underline;
}

.drawer-doi {
  display: inline-block;
  margin-top: 0.5rem;
  font-size: 0.85rem;
}

.drawer-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.75rem;
}

.drawer-tag {
  padding: 0.15rem 0.45rem;
  border-radius: 999px;
  background: var(--color-bg);
  font-size: 0.75rem;
  color: var(--color-muted);
}