/* === CSS Custom Properties === */
:root {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-tertiary: #0f3460;
  --bg-input: #0f3460;
  --accent: #e94560;
  --accent-hover: #c73e54;
  --text-primary: #eee;
  --text-secondary: #aaa;
  --text-muted: #666;
  --border: #0f3460;
  --border-active: #e94560;

  /* Panel sizes */
  --explorer-width: 250px;
  --chat-width: 380px;
  --header-height: 40px;
  --status-height: 24px;

}

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

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
}

#app-container {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
}

/* === Header === */
.app-header {
  height: var(--header-height);
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  padding: 0 8px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  gap: 8px;
  z-index: 10;
}

.header-left, .header-right {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.header-center {
  flex: 1;
  min-width: 0;
  overflow: hidden;
}

.app-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
  white-space: nowrap;
}

.toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 28px;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: 4px;
  transition: background 0.15s, color 0.15s;
}

.toggle-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.toggle-btn.active {
  color: var(--accent);
}

/* === Main Layout (CSS Grid) === */
.app-layout {
  flex: 1;
  display: grid;
  grid-template-columns: var(--explorer-width) 4px 1fr 4px var(--chat-width);
  overflow: hidden;
}

/* === Panels === */
.panel-explorer,
.panel-editor,
.panel-chat {
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* Explicit grid column assignments */
.panel-explorer { grid-column: 1; }
#resize-explorer { grid-column: 2; }
.panel-editor { grid-column: 3; }
#resize-chat { grid-column: 4; }
.panel-chat { grid-column: 5; }

.panel-header {
  height: 32px;
  min-height: 32px;
  display: flex;
  align-items: center;
  padding: 0 12px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  text-transform: uppercase;
  gap: 8px;
}

/* Explorer */
.panel-explorer {
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
}

.explorer-content {
  flex: 1;
  overflow-y: auto;
  padding: 4px 0;
}

.explorer-placeholder,
.editor-placeholder,
.preview-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-muted);
  font-size: 13px;
  gap: 12px;
}

/* File Explorer Tree */
.explorer-selector {
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
}

.project-selector {
  width: 100%;
  padding: 4px 8px;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 12px;
  outline: none;
  cursor: pointer;
}

.project-selector:focus {
  border-color: var(--accent);
}

.file-tree {
  padding: 4px 0;
}

.tree-item {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  cursor: pointer;
  font-size: 13px;
  color: var(--text-primary);
  transition: background 0.1s;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tree-item:hover {
  background: rgba(255, 255, 255, 0.05);
}

.tree-item.selected {
  background: rgba(233, 69, 96, 0.15);
  color: var(--accent);
}

.tree-item--dir {
  color: var(--text-secondary);
  font-weight: 500;
}

.tree-icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
}

.tree-label {
  overflow: hidden;
  text-overflow: ellipsis;
}

.tree-children {
  /* Indentation handled by paddingLeft in JS */
}

.explorer-error {
  padding: 12px;
  color: #f44336;
  font-size: 12px;
  text-align: center;
}

/* Editor */
.panel-editor {
  background: var(--bg-primary);
  display: flex;
  flex-direction: column;
}

.editor-content {
  flex: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

#editor-tabs {
  display: flex;
  gap: 0;
  overflow-x: auto;
  scrollbar-width: none;
}

#editor-tabs::-webkit-scrollbar {
  display: none;
}

.editor-tab-bar {
  display: flex;
  overflow-x: auto;
  scrollbar-width: none;
}

.editor-tab-bar::-webkit-scrollbar {
  display: none;
}

.editor-tabs-placeholder {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  text-transform: uppercase;
}

.editor-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 12px;
  height: 32px;
  font-size: 12px;
  color: var(--text-secondary);
  cursor: pointer;
  border-right: 1px solid var(--border);
  white-space: nowrap;
  transition: background 0.1s, color 0.1s;
  flex-shrink: 0;
}

.editor-tab:hover {
  background: rgba(255, 255, 255, 0.05);
}

.editor-tab.active {
  color: var(--text-primary);
  background: var(--bg-primary);
}

.tab-label {
  max-width: 150px;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tab-close {
  font-size: 16px;
  line-height: 1;
  opacity: 0.4;
  cursor: pointer;
  transition: opacity 0.1s;
}

.tab-close:hover {
  opacity: 1;
  color: var(--accent);
}

.editor-file-header {
  padding: 6px 12px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
}

.editor-file-preview {
  flex: 1;
  overflow: auto;
  padding: 12px;
  font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
  font-size: 13px;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-all;
  color: var(--text-primary);
  tab-size: 2;
}

.preview-area {
  border-top: 1px solid var(--border);
  flex: 1;
  min-height: 200px;
  display: flex;
  flex-direction: column;
}

.preview-toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  height: 28px;
  min-height: 28px;
}

.preview-url {
  flex: 1;
  font-size: 11px;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-family: monospace;
}

.preview-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 12px;
  padding: 2px 6px;
  border-radius: 3px;
  transition: background 0.1s, color 0.1s;
}

.preview-btn:hover {
  background: rgba(255,255,255,0.1);
  color: var(--text-primary);
}

.preview-auto-btn.active {
  color: var(--accent);
}

.preview-iframe {
  flex: 1;
  border: none;
  background: #fff;
  width: 100%;
}

/* Terminal Panel */
.panel-chat {
  background: var(--bg-primary);
  border-left: 1px solid var(--border);
}

.terminal-container {
  flex: 1;
  overflow: hidden;
  padding: 4px 0 4px 10px;
  background: var(--bg-primary);
  position: relative;
}

.terminal-container .xterm {
  height: 100%;
}

/* === Resize Handles === */
.resize-handle {
  width: 4px;
  cursor: col-resize;
  background: transparent;
  transition: background 0.15s;
  z-index: 5;
}

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

/* Chat/Tool/Markdown/Input CSS removed in Op04 — replaced by terminal */

/* === Status Bar === */
.status-bar {
  height: var(--status-height);
  min-height: var(--status-height);
  display: flex;
  align-items: center;
  padding: 0 12px;
  background: var(--bg-tertiary);
  font-size: 11px;
  color: var(--text-secondary);
  gap: 16px;
  z-index: 10;
}

.status-item {
  white-space: nowrap;
}

.status-spacer {
  flex: 1;
}

.status-brand {
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.5px;
}

/* === Mobile Bottom Nav === */
.mobile-nav {
  display: none;
}

/* === Panel Collapsed States === */
.app-layout.explorer-collapsed .panel-explorer,
.app-layout.explorer-collapsed #resize-explorer {
  visibility: hidden;
  width: 0;
  padding: 0;
  border: 0;
  overflow: hidden;
}

/* Editor collapsed: hide editor content + tab bar, but keep panel if preview is visible */
.app-layout.editor-collapsed .editor-tab-bar,
.app-layout.editor-collapsed .editor-content {
  display: none;
}

/* Only collapse the entire panel-editor column when BOTH editor and preview are off */
.app-layout.editor-collapsed.preview-off .panel-editor,
.app-layout.editor-collapsed.preview-off #resize-explorer,
.app-layout.editor-collapsed.preview-off #resize-chat {
  visibility: hidden;
  width: 0;
  padding: 0;
  border: 0;
  overflow: hidden;
}

.app-layout.chat-collapsed .panel-chat,
.app-layout.chat-collapsed #resize-chat {
  visibility: hidden;
  width: 0;
  padding: 0;
  border: 0;
  overflow: hidden;
}

/* Grid column overrides for collapsed combos
   Columns: explorer | resize-e | editor/preview | resize-c | chat
   E=explorer-width, R=4px resize handle, M=1fr middle, C=chat-width
   When collapsed: 0px. When middle has content (editor or preview): 1fr
*/

/* Single panel collapsed */
.app-layout.explorer-collapsed {
  grid-template-columns: 0px 0px 1fr 4px var(--chat-width);
}
.app-layout.editor-collapsed {
  grid-template-columns: var(--explorer-width) 4px 1fr 4px var(--chat-width);
}
.app-layout.editor-collapsed.preview-off {
  grid-template-columns: var(--explorer-width) 0px 0px 0px var(--chat-width);
}
.app-layout.chat-collapsed {
  grid-template-columns: var(--explorer-width) 4px 1fr 0px 0px;
}

/* Two panels collapsed */
.app-layout.explorer-collapsed.editor-collapsed {
  grid-template-columns: 0px 0px 1fr 4px var(--chat-width);
}
.app-layout.explorer-collapsed.editor-collapsed.preview-off {
  /* Only chat: chat expands to fill */
  grid-template-columns: 0px 0px 0px 0px 1fr;
}
.app-layout.explorer-collapsed.chat-collapsed {
  grid-template-columns: 0px 0px 1fr 0px 0px;
}
.app-layout.editor-collapsed.chat-collapsed {
  grid-template-columns: var(--explorer-width) 4px 1fr 0px 0px;
}
.app-layout.editor-collapsed.preview-off.chat-collapsed {
  /* Only explorer: explorer expands to fill */
  grid-template-columns: 1fr 0px 0px 0px 0px;
}

/* Three panels collapsed */
.app-layout.explorer-collapsed.editor-collapsed.chat-collapsed {
  grid-template-columns: 0px 0px 1fr 0px 0px;
}
.app-layout.explorer-collapsed.editor-collapsed.preview-off.chat-collapsed {
  grid-template-columns: 0px 0px 0px 0px 0px;
}

.app-layout.chat-collapsed #resize-chat {
  display: none;
}

/* === Scrollbar Styling === */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: #333;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #555;
}

/* Settings/Permission CSS removed in Op04 — terminal handles permissions natively */

/* === Responsive: Mobile === */
@media (max-width: 768px) {
  .app-header {
    padding: 0 4px;
  }

  .header-center {
    display: none;
  }

  .app-layout {
    grid-template-columns: 1fr !important;
  }

  .panel-explorer,
  .panel-editor,
  .resize-handle {
    display: none;
  }

  .panel-chat {
    display: flex;
    border-left: none;
    grid-column: 1 !important;
  }

  .panel-chat .terminal-container {
    padding-left: 4px;
  }

  .panel-explorer,
  .panel-editor {
    grid-column: 1 !important;
  }

  /* Mobile panel switching */
  .app-layout.mobile-show-explorer .panel-explorer {
    display: flex;
  }
  .app-layout.mobile-show-explorer .panel-chat,
  .app-layout.mobile-show-explorer .panel-editor {
    display: none;
  }

  .app-layout.mobile-show-editor .panel-editor {
    display: flex;
  }
  .app-layout.mobile-show-editor .panel-chat,
  .app-layout.mobile-show-editor .panel-explorer {
    display: none;
  }

  .app-layout.mobile-show-preview .panel-editor {
    display: flex;
  }
  .app-layout.mobile-show-preview .panel-chat,
  .app-layout.mobile-show-preview .panel-explorer {
    display: none;
  }
  .app-layout.mobile-show-preview .editor-tab-bar,
  .app-layout.mobile-show-preview .editor-content {
    display: none;
  }
  .app-layout.mobile-show-preview .preview-area {
    display: flex !important;
  }

  .mobile-nav {
    display: flex;
    height: 52px;
    min-height: 52px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    justify-content: space-around;
    align-items: center;
    z-index: 10;
  }

  .mobile-nav-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px 16px;
    font-size: 10px;
    transition: color 0.15s;
  }

  .mobile-nav-btn.active {
    color: var(--accent);
  }

  .status-bar {
    display: none;
  }

  .toggle-btn#toggle-explorer,
  .toggle-btn#toggle-editor,
  .toggle-btn#toggle-preview,
  .toggle-btn#toggle-chat {
    display: none;
  }
}

/* === Responsive: Tablet === */
@media (min-width: 769px) and (max-width: 1024px) {
  :root {
    --explorer-width: 200px;
    --chat-width: 320px;
  }
}

/* === Login === */

.login-container {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background: var(--bg-primary);
}

.login-card {
  width: 360px;
  padding: 40px 32px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
}

.login-header {
  text-align: center;
  margin-bottom: 32px;
}

.login-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.login-subtitle {
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 2px;
  text-transform: uppercase;
}

.login-field {
  margin-bottom: 16px;
}

.login-field label {
  display: block;
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.login-field input {
  width: 100%;
  padding: 8px 10px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}

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

.login-error {
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 12px;
  text-align: center;
}

.login-btn {
  width: 100%;
  padding: 9px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 3px;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.2s;
}

.login-btn:hover {
  background: var(--accent-hover);
}

.login-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* === User Badge & Logout === */

.header-separator {
  width: 1px;
  height: 20px;
  background: var(--border);
  margin: 0 6px;
}

.user-badge {
  font-size: 12px;
  color: var(--text-secondary);
  padding: 0 4px;
}

.logout-btn {
  color: var(--text-muted);
}

.logout-btn:hover {
  color: var(--accent);
}

/* === Terminal Tabs === */

.terminal-tabs {
  display: flex;
  align-items: center;
  height: 32px;
  min-height: 32px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  scrollbar-width: none;
}

.terminal-tabs::-webkit-scrollbar {
  display: none;
}

.terminal-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 12px;
  height: 100%;
  font-size: 12px;
  color: var(--text-muted);
  border-right: 1px solid var(--border);
  cursor: pointer;
  white-space: nowrap;
  transition: color 0.15s, background 0.15s;
}

.terminal-tab:hover {
  color: var(--text-secondary);
  background: rgba(255,255,255,0.03);
}

.terminal-tab.active {
  color: var(--text-primary);
  background: var(--bg-primary);
  border-bottom: 2px solid var(--accent);
}

.terminal-tab-label {
  pointer-events: auto;
}

.terminal-tab-close {
  font-size: 14px;
  line-height: 1;
  opacity: 0;
  transition: opacity 0.15s;
  color: var(--text-muted);
}

.terminal-tab:hover .terminal-tab-close,
.terminal-tab.active .terminal-tab-close {
  opacity: 1;
}

.terminal-tab-close:hover {
  color: var(--accent);
}

.terminal-tab-add {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 100%;
  font-size: 16px;
  color: var(--text-muted);
  cursor: pointer;
  flex-shrink: 0;
}

.terminal-tab-add:hover {
  color: var(--text-primary);
  background: rgba(255,255,255,0.03);
}

/* Terminal session containers */
.terminal-session-container {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
}

.terminal-session-container .xterm {
  height: 100%;
}

/* === Admin Panel === */

.admin-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.admin-panel {
  width: 640px;
  max-height: 80vh;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.admin-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

.admin-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.admin-close {
  font-size: 20px;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
}

.admin-close:hover {
  color: var(--accent);
}

.admin-body {
  padding: 16px;
  overflow-y: auto;
}

.admin-form {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.admin-input {
  padding: 6px 8px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text-primary);
  font-size: 13px;
  outline: none;
  flex: 1;
}

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

.admin-select {
  flex: 0 0 80px;
}

.admin-btn {
  padding: 6px 12px;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 3px;
  font-size: 13px;
  cursor: pointer;
  white-space: nowrap;
}

.admin-btn:hover {
  background: var(--accent-hover);
}

.admin-error {
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 12px;
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.admin-table th {
  text-align: left;
  padding: 8px 6px;
  color: var(--text-muted);
  font-weight: 500;
  border-bottom: 1px solid var(--border);
}

.admin-table td {
  padding: 8px 6px;
  color: var(--text-secondary);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}

.status-active {
  color: #4caf50;
}

.status-inactive {
  color: var(--text-muted);
}

.admin-actions {
  display: flex;
  gap: 6px;
}

.admin-action-btn {
  padding: 3px 8px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 3px;
  color: var(--text-secondary);
  font-size: 11px;
  cursor: pointer;
}

.admin-action-btn:hover {
  border-color: var(--text-secondary);
  color: var(--text-primary);
}

.admin-action-deactivate:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.admin-section-divider {
  border-top: 1px solid var(--border);
  margin: 16px 0 12px;
}

.admin-empty {
  color: var(--text-muted);
  font-size: 12px;
  padding: 8px 0;
}

.admin-btn-header {
  color: var(--text-muted);
}

.admin-btn-header:hover {
  color: var(--text-primary);
}