/* BRAIN Chat — Obsidian-like Dark Theme */

:root {
  --bg-primary: #1e1e2e;
  --bg-secondary: #181825;
  --bg-tertiary: #11111b;
  --bg-input: #313244;
  --bg-hover: #313244;
  --bg-active: #45475a;
  --bg-msg-user: #89b4fa;
  --bg-msg-assistant: #313244;
  --text-primary: #cdd6f4;
  --text-secondary: #a6adc8;
  --text-muted: #6c7086;
  --text-user-msg: #1e1e2e;
  --accent: #89b4fa;
  --accent-dim: #45475a;
  --border: #313244;
  --border-light: #45475a;
  --scrollbar-thumb: #45475a;
  --scrollbar-track: transparent;
  --success: #a6e3a1;
  --error: #f38ba8;
  --warning: #fab387;
  --radius: 6px;
  --radius-lg: 10px;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
  --transition: 150ms ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  height: 100%;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 14px;
  overflow: hidden;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--scrollbar-track); }
::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ── Login Screen ── */
#login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  background: var(--bg-tertiary);
}

.login-box {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  width: 320px;
  text-align: center;
}

.login-box h1 {
  font-size: 1.4rem;
  margin-bottom: 0.3rem;
  color: var(--accent);
}

.login-box .subtitle {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
}

.login-box input {
  width: 100%;
  padding: 0.7rem 1rem;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 1rem;
  text-align: center;
  letter-spacing: 0.3em;
  outline: none;
  transition: border var(--transition);
}

.login-box input:focus {
  border-color: var(--accent);
}

.login-box button {
  width: 100%;
  margin-top: 1rem;
  padding: 0.7rem;
  background: var(--accent);
  color: var(--bg-tertiary);
  border: none;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity var(--transition);
}

.login-box button:hover { opacity: 0.85; }

.login-error {
  color: var(--error);
  font-size: 0.85rem;
  margin-top: 0.8rem;
  min-height: 1.2em;
}

/* ── App Layout ── */
#app {
  display: none;
  height: 100%;
  flex-direction: column;
}

/* Toolbar */
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px;
  height: 40px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.toolbar-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.toolbar-title {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--accent);
}

.toolbar-right {
  display: flex;
  align-items: center;
  gap: 6px;
}

.toolbar-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 4px 10px;
  border-radius: var(--radius);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all var(--transition);
}

.toolbar-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-light);
}

/* Search in toolbar */
.toolbar-search {
  background: var(--bg-input);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 4px 10px;
  border-radius: var(--radius);
  font-size: 0.8rem;
  width: 200px;
  outline: none;
  transition: border var(--transition);
}

.toolbar-search:focus {
  border-color: var(--accent);
}

/* Main panels */
.panels {
  display: grid;
  grid-template-columns: var(--col-tree, 260px) 4px 1fr 4px var(--col-chat, 380px);
  flex: 1;
  overflow: hidden;
}

/* ── Resize Handles ── */
.resize-handle {
  background: var(--border);
  cursor: col-resize;
  position: relative;
  z-index: 10;
  transition: background var(--transition);
}

.resize-handle:hover,
.resize-handle.dragging {
  background: var(--accent);
}

.resize-handle::after {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: -3px;
  right: -3px;
}

/* ── Tree Panel ── */
.tree-panel {
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 8px 0;
}

.tree-item {
  display: flex;
  align-items: center;
  padding: 3px 8px 3px var(--indent, 12px);
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 0.85rem;
  transition: background var(--transition);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  user-select: none;
}

.tree-item:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.tree-item.active {
  background: var(--bg-active);
  color: var(--text-primary);
}

.tree-icon {
  width: 16px;
  flex-shrink: 0;
  margin-right: 6px;
  font-size: 0.75rem;
  text-align: center;
  color: var(--text-muted);
}

.tree-icon.dir { color: var(--accent-dim); }
.tree-icon.file { color: var(--text-muted); }

.tree-children {
  display: none;
}

.tree-children.open {
  display: block;
}

/* ── Preview Panel ── */
.preview-panel {
  background: var(--bg-primary);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 24px 32px;
}

.preview-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-muted);
  font-style: italic;
}

.preview-path {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

/* Markdown rendering */
.preview-content h1 { font-size: 1.6rem; margin: 0.8em 0 0.4em; color: var(--accent); }
.preview-content h2 { font-size: 1.3rem; margin: 1em 0 0.4em; color: var(--text-primary); border-bottom: 1px solid var(--border); padding-bottom: 4px; }
.preview-content h3 { font-size: 1.1rem; margin: 0.8em 0 0.3em; }
.preview-content h4 { font-size: 1rem; margin: 0.6em 0 0.2em; color: var(--text-secondary); }
.preview-content p { margin: 0.5em 0; line-height: 1.6; }
.preview-content ul, .preview-content ol { margin: 0.5em 0; padding-left: 1.5em; }
.preview-content li { margin: 0.2em 0; line-height: 1.5; }
.preview-content a { color: var(--accent); text-decoration: none; }
.preview-content a:hover { text-decoration: underline; }
.preview-content blockquote {
  border-left: 3px solid var(--accent);
  padding: 4px 12px;
  margin: 0.5em 0;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.preview-content code {
  background: var(--bg-input);
  padding: 2px 5px;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.9em;
}
.preview-content pre {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  overflow-x: auto;
  margin: 0.5em 0;
}
.preview-content pre code {
  background: none;
  padding: 0;
  font-size: 0.85rem;
  line-height: 1.5;
}
.preview-content table {
  border-collapse: collapse;
  width: 100%;
  margin: 0.5em 0;
  font-size: 0.9rem;
}
.preview-content th, .preview-content td {
  border: 1px solid var(--border);
  padding: 6px 10px;
  text-align: left;
}
.preview-content th {
  background: var(--bg-secondary);
  font-weight: 600;
}
.preview-content img { max-width: 100%; border-radius: var(--radius); }
.preview-content hr { border: none; border-top: 1px solid var(--border); margin: 1em 0; }

/* Checkboxes in preview */
.preview-content input[type="checkbox"] {
  margin-right: 6px;
  accent-color: var(--accent);
}

/* ── Chat Panel ── */
.chat-panel {
  background: var(--bg-primary);
  display: flex;
  flex-direction: column;
  min-height: 0;
  min-width: 0;
}

.chat-header {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}

.chat-context {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 400;
  flex: 1;
}

.chat-clear-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 2px 8px;
  border-radius: var(--radius);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all var(--transition);
  flex-shrink: 0;
}

.chat-clear-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-light);
}

.chat-messages {
  flex: 1 1 0;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.chat-msg {
  max-width: 85%;
  padding: 10px 14px;
  border-radius: var(--radius-lg);
  line-height: 1.5;
  font-size: 0.9rem;
  word-wrap: break-word;
}

.chat-msg.user {
  align-self: flex-end;
  background: var(--bg-msg-user);
  color: var(--text-user-msg);
  border-bottom-right-radius: 4px;
}

.chat-msg.assistant {
  align-self: flex-start;
  background: var(--bg-msg-assistant);
  color: var(--text-primary);
  border-bottom-left-radius: 4px;
}

.chat-msg.assistant code {
  background: var(--bg-tertiary);
  padding: 1px 4px;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.85em;
}

.chat-msg.assistant pre {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px;
  overflow-x: auto;
  margin: 6px 0;
}

.chat-msg.assistant pre code {
  background: none;
  padding: 0;
}

.chat-msg.system {
  align-self: center;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-style: italic;
  background: none;
  padding: 4px;
}

.chat-msg.error {
  align-self: center;
  color: var(--error);
  font-size: 0.8rem;
  background: none;
  padding: 4px;
}

/* Typing indicator */
.typing-indicator {
  align-self: flex-start;
  padding: 10px 14px;
  background: var(--bg-msg-assistant);
  border-radius: var(--radius-lg);
  border-bottom-left-radius: 4px;
  display: none;
}

.typing-indicator span {
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--text-muted);
  border-radius: 50%;
  margin: 0 2px;
  animation: typing 1.4s infinite;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-4px); opacity: 1; }
}

/* Chat input */
.chat-input-area {
  padding: 12px 16px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.chat-input-row {
  display: flex;
  gap: 8px;
}

.chat-input {
  flex: 1;
  padding: 10px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  resize: none;
  outline: none;
  max-height: 120px;
  min-height: 42px;
  transition: border var(--transition);
}

.chat-input:focus {
  border-color: var(--accent);
}

.chat-send {
  padding: 0 16px;
  background: var(--accent);
  color: var(--bg-tertiary);
  border: none;
  border-radius: var(--radius-lg);
  font-weight: 600;
  cursor: pointer;
  transition: opacity var(--transition);
  flex-shrink: 0;
}

.chat-send:hover { opacity: 0.85; }
.chat-send:disabled { opacity: 0.4; cursor: not-allowed; }

/* ── Search Results Overlay ── */
.search-results {
  display: none;
  position: absolute;
  top: 40px;
  left: 50%;
  transform: translateX(-50%);
  width: 500px;
  max-height: 400px;
  overflow-y: auto;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  z-index: 100;
  padding: 8px 0;
}

.search-results.visible { display: block; }

.search-result-item {
  display: block;
  padding: 8px 16px;
  cursor: pointer;
  transition: background var(--transition);
}

.search-result-item:hover {
  background: var(--bg-hover);
}

.search-result-name {
  color: var(--text-primary);
  font-size: 0.9rem;
}

.search-result-path {
  color: var(--text-muted);
  font-size: 0.75rem;
}

.search-result-snippet {
  color: var(--text-secondary);
  font-size: 0.8rem;
  margin-top: 2px;
}

/* ── PIN Change Modal ── */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 200;
  align-items: center;
  justify-content: center;
}

.modal-overlay.visible {
  display: flex;
}

.modal {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  width: 320px;
}

.modal h2 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.modal input {
  width: 100%;
  padding: 0.6rem 0.8rem;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 0.9rem;
  margin-bottom: 0.7rem;
  outline: none;
}

.modal input:focus { border-color: var(--accent); }

.modal-buttons {
  display: flex;
  gap: 8px;
  margin-top: 0.5rem;
}

.modal-buttons button {
  flex: 1;
  padding: 0.6rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  cursor: pointer;
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.modal-btn-primary {
  background: var(--accent);
  color: var(--bg-tertiary);
  border: none !important;
  font-weight: 600;
}

.modal-btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.modal-error {
  color: var(--error);
  font-size: 0.8rem;
  min-height: 1em;
}

/* ── Responsive ── */
/* ── Chat Fullscreen (Viewer-Toggle) ── */
.panels.chat-fullscreen {
  grid-template-columns: var(--col-tree, 260px) 4px 1fr;
}
.panels.chat-fullscreen .preview-panel,
.panels.chat-fullscreen #resize-2 {
  display: none;
}
.panels.chat-fullscreen .chat-panel {
  grid-column: 3;
}

@media (max-width: 900px) {
  .panels {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr;
  }
  .tree-panel, .preview-panel, .resize-handle { display: none; }
  .chat-panel { grid-row: 1; min-height: 0; height: 100%; }
  .tree-panel.mobile-visible, .preview-panel.mobile-visible { display: block; }
  /* Mobile: Toggle macht eh keinen Sinn — verstecken */
  #btn-viewer-toggle { display: none; }
}

/* ── Streaming: Tool-Cards, Thinking, Turn-Container ── */
.chat-turn {
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-self: stretch;
}

.tool-card,
.thinking-card {
  align-self: flex-start;
  width: 100%;
  max-width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-secondary);
  font-size: 0.82rem;
  overflow: hidden;
}

.tool-card.pending {
  border-color: var(--accent);
  border-left: 3px solid var(--accent);
}

.tool-card.error {
  border-color: var(--error);
  border-left: 3px solid var(--error);
}

.tool-head,
.thinking-head {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  cursor: pointer;
  user-select: none;
  color: var(--text-secondary);
}

.tool-head:hover,
.thinking-head:hover {
  background: var(--bg-hover);
}

.tool-icon {
  font-size: 0.85rem;
  flex-shrink: 0;
}

.tool-name {
  font-weight: 600;
  color: var(--accent);
  flex-shrink: 0;
}

.tool-summary {
  flex: 1;
  min-width: 0;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tool-toggle {
  flex-shrink: 0;
  color: var(--text-muted);
  font-size: 0.75rem;
}

.tool-body {
  border-top: 1px solid var(--border);
  padding: 8px 10px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.tool-body.collapsed {
  display: none;
}

.tool-input,
.tool-result {
  margin: 0;
  padding: 6px 8px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 240px;
  overflow-y: auto;
  color: var(--text-primary);
}

.tool-result {
  border-left: 2px solid var(--success);
}

.tool-card.error .tool-result {
  border-left-color: var(--error);
}

.thinking-card {
  background: transparent;
  border-style: dashed;
  border-color: var(--border-light);
}

.thinking-head {
  color: var(--text-muted);
  font-style: italic;
}

.thinking-body {
  padding: 6px 12px 10px;
  color: var(--text-muted);
  font-style: italic;
  white-space: pre-wrap;
  font-size: 0.8rem;
  line-height: 1.5;
}

.thinking-card.collapsed .thinking-body {
  display: none;
}

.turn-meta {
  align-self: flex-start;
  color: var(--text-muted);
  font-size: 0.7rem;
  padding: 2px 4px;
  font-family: var(--font-mono);
}

/* Stop-Button-Variante */
.chat-send.streaming {
  background: var(--error);
  color: var(--bg-tertiary);
}

/* Completed thinking cards — response is done */
.thinking-card.completed {
  opacity: 0.5;
  border-style: solid;
  border-color: var(--border);
}

.thinking-card.completed .thinking-head {
  font-style: normal;
}