:root {
  --bg-primary: #1e1e1e;
  --bg-secondary: #252526;
  --bg-tertiary: #2d2d2d;
  --bg-hover: #3a3a3a;
  --text-primary: #cccccc;
  --text-secondary: #999999;
  --text-bright: #ffffff;
  --accent: #0078d4;
  --accent-hover: #1a8cff;
  --danger: #f44747;
  --success: #4ec9b0;
  --warning: #dcdcaa;
  --border: #3c3c3c;
  --tab-bar-height: 56px;
  --header-height: 40px;
  --terminal-tabs-height: 36px;
  --helper-keys-height: 40px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  height: 100%;
  width: 100%;
  overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 14px;
  -webkit-overflow-scrolling: touch;
}

/* Screens */
.screen {
  display: none;
  position: fixed;
  inset: 0;
}
.screen.active {
  display: flex;
}

/* Connect / Login Screens */
#connect-screen,
#login-screen {
  align-items: center;
  justify-content: center;
  background: var(--bg-primary);
}

/* Auth login/register switch */
.auth-switch {
  margin-top: 16px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 13px;
}
.auth-switch a {
  color: var(--accent);
  text-decoration: none;
  margin-left: 6px;
}
.auth-switch a:hover {
  text-decoration: underline;
}

/* Connect screen top bar (user + logout) */
.connect-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}
.connect-user {
  color: var(--text-secondary);
  font-size: 13px;
}
.logout-link {
  color: var(--accent);
  text-decoration: none;
  font-size: 13px;
}
.logout-link:hover {
  text-decoration: underline;
}

.connect-form {
  width: 90%;
  max-width: 400px;
  padding: 24px;
}

.connect-form h1 {
  color: var(--text-bright);
  font-size: 24px;
  margin-bottom: 4px;
}

.connect-form .subtitle {
  color: var(--text-secondary);
  margin-bottom: 24px;
  font-size: 13px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  color: var(--text-secondary);
  font-size: 12px;
  margin-bottom: 4px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-bright);
  font-size: 15px;
  outline: none;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--accent);
}

.form-group textarea {
  font-family: 'Menlo', 'Monaco', 'Courier New', monospace;
  font-size: 12px;
  resize: vertical;
}

.btn-primary {
  width: 100%;
  padding: 12px;
  background: var(--accent);
  color: var(--text-bright);
  border: none;
  border-radius: 6px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

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

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

.error-msg {
  margin-top: 12px;
  padding: 8px 12px;
  background: rgba(244, 71, 71, 0.15);
  border: 1px solid var(--danger);
  border-radius: 6px;
  color: var(--danger);
  font-size: 13px;
}

/* Saved Configs */
.saved-configs-section {
  margin-bottom: 20px;
}

.saved-configs-label {
  display: block;
  color: var(--text-secondary);
  font-size: 12px;
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.saved-configs-list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.saved-configs-list::-webkit-scrollbar {
  display: none;
}

.saved-config-card {
  flex-shrink: 0;
  padding: 10px 14px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  position: relative;
  min-width: 120px;
  max-width: 180px;
}

.saved-config-card:hover {
  border-color: var(--accent);
  background: var(--bg-hover);
}

.saved-config-card .config-name {
  color: var(--text-bright);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  padding-right: 16px;
}

.saved-config-card .config-detail {
  color: var(--text-secondary);
  font-size: 11px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.saved-config-card .config-delete {
  position: absolute;
  top: 4px;
  right: 4px;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 14px;
  cursor: pointer;
  padding: 2px 5px;
  border-radius: 3px;
  opacity: 0;
  transition: opacity 0.15s;
  line-height: 1;
}

.saved-config-card:hover .config-delete {
  opacity: 1;
}

.saved-config-card .config-delete:hover {
  background: var(--danger);
  color: var(--text-bright);
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
  font-size: 14px;
  cursor: pointer;
  margin-bottom: 16px;
}

.checkbox-label input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
}

.hidden {
  display: none !important;
}

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

.header-title {
  font-size: 13px;
  color: var(--text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.btn-icon {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px 8px;
  font-size: 16px;
  border-radius: 4px;
  transition: all 0.15s;
}

.btn-icon:hover {
  background: var(--bg-hover);
  color: var(--text-bright);
}

/* App Screen layout */
#app-screen {
  flex-direction: column;
}

.tab-content {
  flex: 1;
  position: relative;
  overflow: hidden;
}

/* Panels */
.panel {
  display: none;
  position: absolute;
  inset: 0;
  flex-direction: column;
}

.panel.active {
  display: flex;
}

/* Terminal Panel */
.terminal-tabs {
  height: var(--terminal-tabs-height);
  display: flex;
  align-items: center;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  flex-shrink: 0;
  -webkit-overflow-scrolling: touch;
}

.terminal-tab-list {
  display: flex;
  flex: 1;
  overflow-x: auto;
  scrollbar-width: none;
}

.terminal-tab-list::-webkit-scrollbar {
  display: none;
}

.terminal-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 12px;
  height: var(--terminal-tabs-height);
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 12px;
  cursor: pointer;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  transition: all 0.15s;
}

.terminal-tab.active {
  color: var(--text-bright);
  border-bottom-color: var(--accent);
  background: var(--bg-tertiary);
}

.terminal-tab .close-tab {
  font-size: 14px;
  line-height: 1;
  padding: 2px;
  border-radius: 3px;
  opacity: 0.5;
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
}

.terminal-tab .close-tab:hover {
  opacity: 1;
  background: var(--bg-hover);
}

.terminal-tab-add {
  flex-shrink: 0;
  width: 32px;
  height: 28px;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 18px;
  cursor: pointer;
  border-radius: 4px;
  margin: 0 4px;
}

.terminal-tab-add:hover {
  background: var(--bg-hover);
  color: var(--text-bright);
}

.terminal-container {
  flex: 1;
  min-height: 0;
  position: relative;
  overflow: hidden;
}

.terminal-instance {
  position: absolute;
  inset: 0;
  display: none;
}

.terminal-instance.active {
  display: block;
}

.terminal-instance .xterm {
  height: 100%;
  padding: 4px;
}

/* Global floating shortcut panel */
.shortcut-fab {
  position: fixed;
  top: 50%;
  right: 0;
  transform: translateY(-50%);
  z-index: 200;
  display: flex;
  align-items: center;
  gap: 6px;
  flex-direction: row-reverse;
  max-width: calc(100vw - 8px);
}

.shortcut-toggle {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  touch-action: none;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
  opacity: 0.85;
}

.shortcut-toggle:active {
  background: var(--accent);
  color: var(--text-bright);
  opacity: 1;
}

.shortcut-panel {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 4px;
  padding: 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.5);
  max-height: 70vh;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.shortcut-panel.hidden {
  display: none;
}

.shortcut-panel button {
  padding: 8px 10px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text-primary);
  font-size: 13px;
  font-family: monospace;
  cursor: pointer;
  white-space: nowrap;
  min-width: 44px;
  text-align: center;
}

.shortcut-panel button:active {
  background: var(--accent);
  color: var(--text-bright);
}

.shortcut-panel button.ctrl-active {
  background: var(--accent);
  color: var(--text-bright);
}

/* File Browser */
.file-browser-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  gap: 8px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 4px;
  overflow-x: auto;
  flex: 1;
  font-size: 13px;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.breadcrumb::-webkit-scrollbar {
  display: none;
}

.breadcrumb-item {
  color: var(--accent);
  cursor: pointer;
  white-space: nowrap;
  background: none;
  border: none;
  font-size: 13px;
  padding: 2px 4px;
  border-radius: 3px;
}

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

.breadcrumb-sep {
  color: var(--text-secondary);
}

.file-actions {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

.file-list {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

.file-item {
  display: flex;
  align-items: center;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.1s;
  gap: 10px;
}

.file-item:active {
  background: var(--bg-hover);
}

.file-icon {
  font-size: 18px;
  width: 24px;
  text-align: center;
  flex-shrink: 0;
}

.file-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 14px;
}

.file-size {
  color: var(--text-secondary);
  font-size: 12px;
  flex-shrink: 0;
}

.file-item-actions {
  display: flex;
  gap: 2px;
  flex-shrink: 0;
}

.file-item-actions .btn-icon {
  font-size: 14px;
  padding: 4px 6px;
}

.file-list-empty {
  padding: 40px 20px;
  text-align: center;
  color: var(--text-secondary);
}

/* Editor */
.editor-header {
  display: flex;
  align-items: center;
  padding: 8px 12px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  gap: 4px;
}

.editor-filename {
  font-size: 13px;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.editor-dirty {
  color: var(--warning);
  font-size: 18px;
  font-weight: bold;
}

.editor-container {
  flex: 1;
  min-height: 0;
  overflow: hidden;
  position: relative;
}

.editor-container .cm-editor {
  height: 100%;
}

.editor-container .cm-scroller {
  overflow: auto;
  -webkit-overflow-scrolling: touch;
}

.fab-save {
  position: absolute;
  bottom: 20px;
  right: 20px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--text-bright);
  border: none;
  font-size: 20px;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0,0,0,0.4);
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.fab-save:hover {
  background: var(--accent-hover);
}

/* Bottom Tab Bar */
.tab-bar {
  display: flex;
  height: var(--tab-bar-height);
  padding-bottom: var(--safe-bottom);
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.tab-btn {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  transition: color 0.15s;
  padding: 4px;
}

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

.tab-icon {
  font-size: 18px;
  line-height: 1;
}

.tab-label {
  font-size: 11px;
}

/* Toast */
#toast-container {
  position: fixed;
  top: 60px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.toast {
  padding: 8px 16px;
  border-radius: 6px;
  font-size: 13px;
  color: var(--text-bright);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  animation: toast-in 0.3s ease;
  white-space: nowrap;
}

.toast.success { border-color: var(--success); }
.toast.error { border-color: var(--danger); }
.toast.info { border-color: var(--accent); }

@keyframes toast-in {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Loading */
.loading-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(30, 30, 30, 0.7);
  z-index: 100;
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Modal / Prompt */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 500;
}

.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  width: 90%;
  max-width: 360px;
}

.modal h3 {
  color: var(--text-bright);
  margin-bottom: 12px;
  font-size: 16px;
}

.modal input {
  width: 100%;
  padding: 8px 12px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-bright);
  font-size: 14px;
  outline: none;
  margin-bottom: 12px;
}

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

.modal-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

.modal-actions button {
  padding: 6px 16px;
  border-radius: 4px;
  border: none;
  font-size: 13px;
  cursor: pointer;
}

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

.modal-actions .btn-confirm {
  background: var(--accent);
  color: var(--text-bright);
}