.knowledge-panel {
  flex: none;
  overflow: hidden;
}

.knowledge-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.knowledge-header h2 {
  margin: 0;
  font-size: 18px;
}

.knowledge-count {
  font-size: 12px;
  color: var(--muted);
}

.knowledge-count.has-data {
  color: var(--success-text);
}

.knowledge-body {
  display: flex;
  gap: 16px;
  align-items: stretch;
}

.drop-zone {
  flex: 1 1 0;
  min-width: 200px;
  border: 2px dashed var(--border);
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 24px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s, transform 0.15s;
}

.drop-zone:hover,
.drop-zone.dragover {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 6%, transparent);
  transform: scale(1.01);
}

.drop-zone.uploading {
  border-color: var(--accent);
  animation: dropPulse 1.2s ease-in-out infinite;
  pointer-events: none;
}

@keyframes dropPulse {
  0%, 100% { background: color-mix(in srgb, var(--accent) 4%, transparent); }
  50% { background: color-mix(in srgb, var(--accent) 12%, transparent); }
}

.drop-zone .icon {
  font-size: 36px;
}

.drop-zone-title {
  font-weight: 600;
  color: var(--ink);
  font-size: 15px;
}

.drop-zone-subtitle {
  font-size: 12px;
  color: var(--muted);
}

.drop-zone input[type="file"] {
  display: none;
}

/* --- URL zone: horizontal input row --- */
.url-zone {
  flex: 1 1 0;
  min-width: 200px;
  border: 2px dashed var(--border);
  border-radius: 14px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 24px;
  text-align: center;
  color: var(--muted);
  transition: border-color 0.2s, background 0.2s;
}

.url-zone:focus-within {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 4%, transparent);
}

.url-zone-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.url-zone-header .icon {
  font-size: 36px;
}

.url-input-row {
  display: flex;
  gap: 8px;
  width: 100%;
  align-items: center;
}

.url-inline-input {
  flex: 1;
  min-width: 0;
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--ink);
  font-size: 13px;
}

.url-inline-input::placeholder {
  color: var(--muted);
  opacity: 0.6;
}

.url-inline-input:focus {
  outline: none;
  border-color: var(--accent);
}

.url-inline-btn {
  flex-shrink: 0;
  padding: 8px 18px;
  border-radius: 10px;
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
  cursor: pointer;
  font-weight: 600;
  font-size: 13px;
  transition: background 0.2s, color 0.2s;
  white-space: nowrap;
}

.url-inline-btn:hover {
  background: var(--accent);
  color: var(--accent-on-dark);
}

.url-inline-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.knowledge-feedback {
  margin-top: 10px;
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 13px;
  display: none;
}

.knowledge-feedback.success {
  display: block;
  background: var(--success-bg);
  color: var(--success-text);
  border: 1px solid var(--success-border);
}

.knowledge-feedback.error {
  display: block;
  background: var(--error-bg);
  color: var(--error-text);
  border: 1px solid var(--error-border);
}

.knowledge-feedback.loading {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--warning-bg);
  color: var(--warning-text);
  border: 1px solid var(--warning-border);
}

.knowledge-spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid var(--warning-border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.knowledge-source-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.knowledge-source-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 10px;
  background: var(--surface-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 13px;
}

.knowledge-source-label {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
  min-width: 0;
}

@media (max-width: 640px) {
  .knowledge-panel {
    padding: 10px;
  }

  .knowledge-header h2 {
    font-size: 15px;
  }

  .knowledge-body {
    flex-direction: column;
    gap: 10px;
  }

  .drop-zone,
  .url-zone {
    padding: 16px 12px;
    min-width: 0;
  }

  .drop-zone .icon,
  .url-zone-header .icon {
    font-size: 24px;
  }

  .drop-zone-title {
    font-size: 13px;
  }

  .drop-zone-subtitle {
    font-size: 11px;
  }
}

.knowledge-source-delete {
  flex-shrink: 0;
  margin-left: 8px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
  color: var(--muted);
  padding: 2px 6px;
  border-radius: 4px;
}

.knowledge-source-delete:hover {
  color: var(--error-text);
  background: var(--error-bg);
}

@media (max-width: 640px) {
  .knowledge-body {
    flex-direction: column;
  }
}