.icon-btn {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  border-radius: 10px;
  width: 34px;
  height: 34px;
  cursor: pointer;
}

.upload-zone {
  margin: 12px;
  padding: 20px 16px;
  border: 2px dashed var(--border);
  border-radius: 12px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s;
  color: var(--text-muted);
  font-size: 13px;
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--accent);
  background: rgba(99, 102, 241, 0.05);
  color: var(--accent);
}

.upload-zone svg {
  margin-bottom: 8px;
}

.upload-zone input {
  display: none;
}

.upload-caption {
  font-size: 11px;
  margin-top: 4px;
  color: var(--text-muted);
}

.doc-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px 12px;
}

.doc-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 13px;
}

.doc-item:hover {
  background: var(--surface);
}

.doc-item .name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}

.doc-item .delete-btn {
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
}

.doc-item .delete-btn:hover {
  color: var(--danger);
}

.empty-state {
  padding: 24px;
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
}

.message {
  max-width: 80%;
  padding: 12px 14px;
  border-radius: 16px;
  font-size: 14px;
  line-height: 1.55;
  white-space: pre-wrap;
  word-break: break-word;
}

.message.user {
  align-self: flex-end;
  background: var(--accent);
  color: #fff;
  border-bottom-right-radius: 5px;
}

.message.assistant {
  align-self: flex-start;
  background: var(--surface);
  border: 1px solid var(--border);
  border-bottom-left-radius: 5px;
}

.message.system {
  align-self: center;
  color: var(--text-muted);
  font-size: 12px;
  padding: 4px 0;
}

.message.assistant h1,
.message.assistant h2,
.message.assistant h3,
.message.assistant h4 {
  margin: 10px 0 6px;
}

.message.assistant p {
  margin: 8px 0;
}

.message.assistant ul,
.message.assistant ol {
  margin: 8px 0 8px 22px;
}

.message.assistant code {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1px 6px;
  font-size: 12px;
}

.message.assistant pre {
  background: #0b0d12;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  overflow-x: auto;
  margin: 10px 0;
}

.message.assistant pre code {
  border: none;
  background: transparent;
  padding: 0;
}

.model-row {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-muted);
  font-size: 13px;
}

.model-row select {
  max-width: 380px;
  width: 100%;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
}

.model-hint {
  font-size: 12px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.input-row {
  display: flex;
  gap: 10px;
}

.input-row textarea {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
  min-height: 48px;
  max-height: 120px;
  resize: none;
}

.input-row button {
  border: none;
  border-radius: 12px;
  background: var(--accent);
  color: #fff;
  padding: 0 18px;
  font-size: 14px;
  cursor: pointer;
}

.input-row button:hover {
  background: var(--accent-hover);
}

.input-row button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.uploading-overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 17, 23, 0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 16px;
  z-index: 10;
  padding: 24px;
}

.progress-info {
  text-align: center;
}

.progress-file,
.progress-stats {
  color: var(--text-muted);
  font-size: 12px;
}

.progress-phase {
  color: var(--accent);
  font-size: 13px;
  font-weight: 500;
}

.progress-count {
  font-size: 18px;
  font-weight: 600;
}

.progress-container {
  width: 100%;
  max-width: 260px;
}

.progress-bar-bg {
  width: 100%;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
  margin-top: 8px;
}

.progress-bar-fill {
  height: 100%;
  background: var(--accent);
  width: 0;
  transition: width 0.35s ease;
}

.mobile-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.mobile-backdrop.visible {
  opacity: 1;
  pointer-events: auto;
}