.sidebar {
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-5) var(--space-5) var(--space-4);
}

.brand-logo {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  object-fit: cover;
  flex-shrink: 0;
}

.brand-logo-fallback {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-deep-blue) 0%, var(--color-accent) 130%);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 15px;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}

.brand-text {
  min-width: 0;
}

.brand-name {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.brand-tagline {
  font-size: 12.5px;
  color: var(--color-ink-faint);
  margin-top: 2px;
}

.sidebar-close {
  display: none;
  margin-left: auto;
}

@media (max-width: 1023px) {
  .sidebar-close {
    display: inline-flex;
  }
}

.status-row {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0 var(--space-5) var(--space-4);
  font-size: 13px;
  color: var(--color-ink-soft);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-ink-faint);
  flex-shrink: 0;
  transition: background 0.2s ease;
}

.status-dot.online {
  background: var(--color-success);
  box-shadow: 0 0 0 3px var(--color-success-soft);
  animation: status-pulse 2.2s ease-in-out infinite;
}

.status-dot.offline {
  background: var(--color-danger);
  box-shadow: 0 0 0 3px var(--color-danger-soft);
}

@keyframes status-pulse {
  0%,
  100% {
    box-shadow: 0 0 0 3px var(--color-success-soft);
  }
  50% {
    box-shadow: 0 0 0 6px var(--color-success-soft);
  }
}

.sidebar-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-5) var(--space-3);
}

.sidebar-section-header h2 {
  font-size: 12.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-ink-faint);
}

.document-list {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-1) var(--space-3) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.document-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.document-item:hover {
  background: var(--color-surface-alt);
  border-color: var(--color-border-strong);
}

.document-item.is-pending {
  opacity: 0.6;
}

.document-item--clickable {
  cursor: pointer;
}

.document-icon {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 16px;
}

.document-info {
  min-width: 0;
  flex: 1;
}

.document-name {
  font-size: 13.5px;
  font-weight: 500;
  color: var(--color-ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.document-meta {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--color-ink-faint);
  margin-top: 2px;
}

.document-delete {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-ink-faint);
  flex-shrink: 0;
  opacity: 0;
  transition: opacity 0.15s ease, background 0.15s ease, color 0.15s ease;
}

.document-item:hover .document-delete,
.document-item:focus-within .document-delete {
  opacity: 1;
}

.document-delete:hover {
  background: var(--color-danger-soft);
  color: var(--color-danger);
}

.upload-progress {
  margin: 0 var(--space-5) var(--space-4);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  background: var(--color-accent-soft);
  font-size: 12.5px;
  color: var(--color-accent);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.spinner {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid currentColor;
  border-top-color: transparent;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.empty-state {
  margin: var(--space-3) var(--space-5);
  padding: var(--space-6) var(--space-4);
  text-align: center;
  border: 1px dashed var(--color-border-strong);
  border-radius: var(--radius-md);
  color: var(--color-ink-faint);
}

.empty-state-icon {
  font-size: 22px;
  margin-bottom: var(--space-2);
}

.empty-state-title {
  font-size: 13.5px;
  color: var(--color-ink-soft);
  font-weight: 500;
  margin-bottom: 2px;
}

.empty-state-hint {
  font-size: 12.5px;
  line-height: 1.4;
}

.sidebar-footer {
  margin-top: auto;
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--color-border);
  flex-shrink: 0;
}

.btn-block {
  width: 100%;
}