:root {
  --bg: #1e1e1e;
  --bg-panel: #252526;
  --bg-sidebar: #252526;
  --bg-editor: #1e1e1e;
  --bg-toolbar: #323233;
  --bg-menubar: #3c3c3c;
  --bg-hover: #2a2d2e;
  --bg-active: #37373d;
  --border: #3c3c3c;
  --text: #cccccc;
  --text-dim: #858585;
  --text-bright: #ffffff;
  --accent: #0e639c;
  --accent-hover: #1177bb;
  --green: #4ec9b0;
  --red: #f48771;
  --yellow: #dcdcaa;
  --blue: #569cd6;
  --purple: #c586c0;
  --orange: #ce9178;
  --terminal-bg: #000000;
  --terminal-fg: #c0c0c0;
  --font-mono: 'SF Mono', 'Menlo', 'Monaco', 'Consolas', monospace;
  --font-ui: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --app-font-size: 12px;
  --files-font-size: 12px;
  --assistant-font-size: 12px;
  --terminal-font-size: 12px;
}

/* Light theme */
[data-theme="light"] {
  --bg: #ffffff;
  --bg-panel: #f3f3f3;
  --bg-sidebar: #f3f3f3;
  --bg-editor: #ffffff;
  --bg-toolbar: #ececec;
  --bg-menubar: #0066b8;
  --bg-hover: #e8e8e8;
  --bg-active: #e0e0e0;
  --border: #d4d4d4;
  --text: #333333;
  --text-dim: #858585;
  --text-bright: #000000;
  --accent: #0066b8;
  --accent-hover: #0078d4;
  --green: #107c10;
  --red: #d13438;
  --yellow: #795e26;
  --blue: #0066b8;
  --purple: #af00db;
  --orange: #ca5010;
  --terminal-bg: #ffffff;
  --terminal-fg: #333333;
}

/* System theme (light) - only applies when no explicit theme is set */
@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --bg: #ffffff;
    --bg-panel: #f3f3f3;
    --bg-sidebar: #f3f3f3;
    --bg-editor: #ffffff;
    --bg-toolbar: #ececec;
    --bg-menubar: #0066b8;
    --bg-hover: #e8e8e8;
    --bg-active: #e0e0e0;
    --border: #d4d4d4;
    --text: #333333;
    --text-dim: #858585;
    --text-bright: #000000;
    --accent: #0066b8;
    --accent-hover: #0078d4;
    --green: #107c10;
    --red: #d13438;
    --yellow: #795e26;
    --blue: #0066b8;
    --purple: #af00db;
    --orange: #ca5010;
    --terminal-bg: #ffffff;
    --terminal-fg: #333333;
  }
}

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

html, body {
  height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  font-size: var(--app-font-size);
}
body {
  height: 100dvh;
}

/* ---- Login page ---- */
.login-page {
  min-height: 100%;
  overflow: auto;
  display: grid;
  place-items: center;
  padding:
    calc(24px + env(safe-area-inset-top))
    calc(24px + env(safe-area-inset-right))
    calc(24px + env(safe-area-inset-bottom))
    calc(24px + env(safe-area-inset-left));
  background:
    radial-gradient(ellipse at 50% 0, color-mix(in srgb, var(--accent) 18%, transparent), transparent 55%),
    var(--bg);
}
.login-card {
  width: min(100%, 400px);
  padding: 32px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.28);
}
.login-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-bottom: 24px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border);
}
.login-mark {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-family: var(--font-mono);
  font-size: var(--app-font-size);
  font-weight: 700;
}
.login-brand h1 {
  color: var(--text-bright);
  font-size: var(--app-font-size);
  font-weight: 600;
}
.login-brand p,
.login-description,
.login-footer {
  color: var(--text-dim);
}
.login-brand p {
  margin-top: 4px;
  font-size: var(--app-font-size);
}
.login-card h2 {
  color: var(--text-bright);
  font-size: var(--app-font-size);
  font-weight: 600;
}
.login-description {
  margin: 8px 0 20px;
  line-height: 1.5;
}
.login-card form {
  display: flex;
  flex-direction: column;
}
.login-card label {
  margin: 0 0 6px;
  color: var(--text);
  font-weight: 600;
}
.login-card input {
  width: 100%;
  margin-bottom: 16px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 4px;
  outline: none;
  background: var(--bg);
  color: var(--text-bright);
  font: inherit;
}
.login-card input:focus {
  border-color: var(--accent);
}
.login-card .login-remember {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  color: var(--text);
  font-weight: 400;
  cursor: pointer;
}
.login-card .login-remember input {
  width: auto;
  margin: 0;
  accent-color: var(--accent);
}
.login-submit,
.login-secondary {
  width: 100%;
  min-height: 38px;
  border: 1px solid var(--accent);
  border-radius: 4px;
  background: var(--accent);
  color: #fff;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.login-submit:hover {
  background: var(--accent-hover);
}
.login-submit:disabled {
  opacity: 0.65;
  cursor: wait;
}
.login-secondary {
  margin-top: 8px;
  border-color: var(--border);
  background: transparent;
  color: var(--text);
}
.login-secondary:hover {
  background: var(--bg-hover);
}
.login-error {
  margin: -4px 0 14px;
  color: var(--red);
  line-height: 1.4;
}
.login-footer {
  padding-top: 20px;
  margin-top: 24px;
  border-top: 1px solid var(--border);
  font-size: var(--app-font-size);
  text-align: center;
}

/* ---- Menu bar ---- */
#menubar {
  display: flex;
  align-items: center;
  height: calc(30px + env(safe-area-inset-top));
  background: var(--bg-menubar);
  border-bottom: 1px solid var(--border);
  padding: env(safe-area-inset-top) 8px 0;
  user-select: none;
  overflow: hidden;
}
.menu-item {
  padding: 4px 10px;
  cursor: pointer;
  border-radius: 3px;
  color: var(--text);
  white-space: nowrap;
  flex-shrink: 0;
}
.menu-item:hover, .menu-item.open {
  background: rgba(255, 255, 255, 0.12);
  color: var(--text-bright);
}
#menubar-title {
  margin-left: auto;
  color: var(--text-dim);
  font-size: var(--app-font-size);
}

/* Light mode: menubar and activity bar are blue, so text/icons are white */
[data-theme="light"] #menubar .menu-item {
  color: #ffffff;
}
[data-theme="light"] #menubar .menu-item:hover,
[data-theme="light"] #menubar .menu-item.open {
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
}
[data-theme="light"] #menubar-title {
  color: rgba(255, 255, 255, 0.8);
}

/* ---- Dropdown menus ---- */
#menu-dropdowns {
  position: absolute;
  top: 30px;
  left: 0;
  z-index: 1000;
}
.dropdown {
  position: absolute;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.4);
  min-width: 200px;
  padding: 4px 0;
  display: none;
}
.dropdown.open { display: block; }
.dropdown-item {
  padding: 6px 16px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  white-space: nowrap;
}
.dropdown-item[data-toggle] { position: relative; }
.dropdown-item[data-toggle]::before {
  position: absolute;
  left: 3px;
}
.dropdown-item[data-toggle].checked::before {
  content: '✓';
}
.dropdown-item:hover { background: var(--accent); color: white; }
.dropdown-item .shortcut { color: var(--text-dim); font-size: var(--app-font-size); margin-left: 20px; white-space: nowrap; flex-shrink: 0; }
.dropdown-item:hover .shortcut { color: #ddd; }
.dropdown-sep {
  height: 1px;
  background: var(--border);
  margin: 4px 0;
}

/* ---- Context menu ---- */
.context-menu {
  position: fixed;
  z-index: 3000;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.4);
  min-width: 160px;
  padding: 4px 0;
}
.context-menu-item {
  padding: 6px 16px;
  cursor: pointer;
  white-space: nowrap;
}
.context-menu-item:hover { background: var(--accent); color: white; }
.context-menu-item.danger { color: var(--red, #e5534b); }
.context-menu-item.danger:hover { background: var(--red, #e5534b); color: white; }
.context-menu-sep {
  height: 1px;
  background: var(--border);
  margin: 4px 0;
}

/* ---- Tooltip ---- */
.tooltip {
  position: fixed;
  z-index: 2000;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 4px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.5);
  padding: 5px 10px;
  font-size: var(--app-font-size);
  color: var(--text-bright);
  pointer-events: none;
  display: none;
  white-space: nowrap;
  font-family: var(--font-ui);
}
.tooltip .tooltip-shortcut {
  color: var(--text-dim);
  margin-left: 8px;
  font-size: var(--app-font-size);
}

/* ---- Toolbar ---- */
#toolbar {
  display: flex;
  align-items: center;
  gap: 4px;
  height: 36px;
  background: var(--bg-toolbar);
  border-bottom: 1px solid var(--border);
  padding: 0 8px;
}
#toolbar button {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text);
  padding: 4px 8px;
  border-radius: 3px;
  cursor: pointer;
  font-size: var(--app-font-size);
  display: flex;
  align-items: center;
  justify-content: center;
}
#toolbar button:hover { background: var(--bg-hover); }
#toolbar button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}
#toolbar button:disabled:hover,
#toolbar button:disabled:active {
  background: transparent;
  transform: none;
}
#toolbar button:active {
  transform: scale(0.9);
  background: var(--bg-active);
}
#toolbar button.toolbar-green { color: var(--green); }
#toolbar button.toolbar-green:hover { background: rgba(78, 201, 176, 0.15); }
#toolbar button.toolbar-green:active { background: rgba(78, 201, 176, 0.3); }
#toolbar button.toolbar-blue { color: var(--blue); }
#toolbar button.toolbar-blue:hover { background: rgba(86, 156, 214, 0.15); }
#toolbar button.toolbar-blue:active { background: rgba(86, 156, 214, 0.3); }
#toolbar button.toolbar-red { color: var(--red); }
#toolbar button.toolbar-red:hover { background: rgba(244, 135, 113, 0.15); }
#toolbar button.toolbar-red:active { background: rgba(244, 135, 113, 0.3); }

/* Click flash animation */
@keyframes click-flash {
  0% { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.6); }
  100% { box-shadow: 0 0 0 8px rgba(255, 255, 255, 0); }
}
.click-flash {
  animation: click-flash 0.3s ease-out;
}
.toolbar-sep {
  width: 1px;
  height: 20px;
  background: var(--border);
  margin: 0 4px;
}
.status-text {
  margin-left: auto;
  color: var(--text-dim);
  font-size: var(--app-font-size);
}

/* ---- Main layout ---- */
#main {
  display: flex;
  height: calc(100% - 30px - 36px - 22px - env(safe-area-inset-top) - env(safe-area-inset-bottom));
  min-height: 200px;
}

/* ---- Activity bar ---- */
#activity-bar {
  width: 48px;
  background: #2d2d2d;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 4px;
  flex-shrink: 0;
  overflow-y: auto;
}
.activity-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border-radius: 4px;
  margin-bottom: 2px;
  position: relative;
  color: #858585;
  background: transparent;
  font: inherit;
}
.activity-icon:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.08);
}
.activity-icon:active {
  transform: scale(0.9);
  background: rgba(255, 255, 255, 0.14);
}
.activity-icon.active {
  color: #ffffff;
}
.activity-icon svg {
  display: block;
}
.sidebar {
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  flex-shrink: 0;
}
#sidebar-left { width: 220px; }
#sidebar-right {
  width: 440px;
  flex: 0 0 440px;
  min-width: 0;
  border-right: none;
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.agent-column {
  --app-font-size: var(--assistant-font-size);
  width: 300px;
  flex: 0 0 300px;
  min-width: 240px;
  border-left: 1px solid var(--border);
  border-right: none;
  display: flex;
  flex-direction: column;
}
.agent-column-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.agent-new-conversation {
  padding: 3px 7px;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: var(--bg-toolbar);
  color: var(--text);
  font: var(--app-font-size) var(--font-ui);
  cursor: pointer;
}
.agent-new-conversation:hover:not(:disabled) { background: var(--bg-hover); }
.agent-new-conversation:disabled { cursor: not-allowed; opacity: 0.5; }
.agent-content {
  display: flex;
  flex: 1;
  min-height: 0;
  flex-direction: column;
  gap: 10px;
  padding: 12px;
  overflow: hidden;
}
.agent-usage-panel {
  flex: 0 0 auto;
  min-width: 0;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-panel);
}
.agent-usage-label {
  margin-bottom: 4px;
  color: var(--text-dim);
  font-size: var(--app-font-size);
  font-weight: 600;
  letter-spacing: 0.4px;
  text-transform: uppercase;
}
.agent-status {
  color: var(--text-dim);
  font-size: var(--app-font-size);
  line-height: 1.4;
}
.agent-chat {
  display: flex;
  flex: 1 1 auto;
  min-height: 0;
  flex-direction: column;
  gap: 10px;
  overflow-y: auto;
  padding: 2px 2px 8px;
}
.agent-chat-empty {
  margin: auto 0;
  color: var(--text-dim);
  font-size: var(--app-font-size);
  line-height: 1.5;
  text-align: center;
}
.agent-message {
  max-width: 100%;
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: var(--app-font-size);
  line-height: 1.5;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.agent-message.user {
  align-self: flex-end;
  background: var(--bg-toolbar);
}
.agent-message.assistant {
  align-self: stretch;
  padding: 2px 0;
  border: none;
  background: transparent;
}
.agent-composer {
  display: flex;
  flex: 0 0 auto;
  flex-direction: column;
  gap: 8px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}
.agent-prompt-label-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}
.agent-column .agent-field {
  margin: 0;
  color: var(--text);
  font-size: var(--app-font-size);
}
.agent-undo {
  padding: 2px 7px;
  border: 1px solid var(--accent);
  border-radius: 3px;
  background: var(--accent);
  color: #fff;
  font: var(--app-font-size) var(--font-ui);
  cursor: pointer;
}
.agent-undo:hover:not(:disabled) { background: var(--accent-hover); }
.agent-undo:disabled { cursor: wait; opacity: 0.6; }
.agent-undo[hidden] { display: none; }
.agent-prompt {
  width: 100%;
  min-height: 88px;
  max-height: 220px;
  box-sizing: border-box;
  resize: vertical;
  padding: 8px;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: var(--bg);
  color: var(--text-bright);
  font: var(--app-font-size)/1.45 var(--font-mono);
}
.agent-prompt:focus { border-color: var(--accent); outline: none; }
.agent-mode {
  flex: 0 0 58px;
  width: 58px;
  min-width: 0;
  height: 16px;
  appearance: none;
  -webkit-appearance: none;
  box-sizing: border-box;
  padding: 0 12px 0 4px;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: var(--bg);
  background-image:
    linear-gradient(45deg, transparent 50%, var(--text-dim) 50%),
    linear-gradient(135deg, var(--text-dim) 50%, transparent 50%);
  background-position:
    calc(100% - 6px) 5px,
    calc(100% - 2px) 5px;
  background-size: 4px 4px;
  background-repeat: no-repeat;
  color: var(--text-bright);
  font: var(--app-font-size) var(--font-ui);
}
.agent-mode:focus { border-color: var(--accent); outline: none; }
.agent-generation-select {
  flex: 0 0 58px;
  width: 58px;
  min-width: 0;
  height: 16px;
  appearance: none;
  -webkit-appearance: none;
  box-sizing: border-box;
  padding: 0 12px 0 4px;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: var(--bg);
  background-image:
    linear-gradient(45deg, transparent 50%, var(--text-dim) 50%),
    linear-gradient(135deg, var(--text-dim) 50%, transparent 50%);
  background-position:
    calc(100% - 6px) 5px,
    calc(100% - 2px) 5px;
  background-size: 4px 4px;
  background-repeat: no-repeat;
  color: var(--text-bright);
  font: var(--app-font-size) var(--font-ui);
}
#agent-thinking {
  flex-basis: 72px;
  width: 72px;
}
.agent-generation-select:focus { border-color: var(--accent); outline: none; }
.agent-generation-select:disabled { opacity: 0.65; }
.agent-composer-actions {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 6px;
}
.agent-usage {
  display: block;
  min-width: 0;
  color: var(--text);
  font-size: var(--app-font-size);
  line-height: 1.4;
  overflow-wrap: anywhere;
}
.agent-icon-button {
  display: inline-flex;
  flex: 0 0 24px;
  width: 24px;
  height: 24px;
  align-items: center;
  justify-content: center;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--bg-toolbar);
  color: var(--text-bright);
  cursor: pointer;
}
.agent-send { margin-left: auto; }
.agent-icon-button:hover:not(:disabled) { background: var(--bg-hover); }
.agent-icon-button:disabled { cursor: not-allowed; opacity: 0.5; }
.agent-icon-button svg { width: 14px; height: 14px; }
.agent-icon-button[hidden] { display: none; }
.agent-send { background: var(--accent); border-color: var(--accent); color: #fff; }
.agent-send:hover:not(:disabled) { background: var(--accent-hover); }
.agent-stop { color: var(--red); }

/* ---- Resizable dividers ---- */
.divider {
  flex-shrink: 0;
  background: transparent;
  position: relative;
  z-index: 10;
}
.divider.hidden { display: none; }
.divider-vertical {
  width: 4px;
  cursor: col-resize;
}
.divider-vertical:hover,
.divider-vertical.dragging {
  background: var(--accent);
}
.divider-horizontal {
  height: 4px;
  cursor: row-resize;
}
.divider-horizontal:hover,
.divider-horizontal.dragging {
  background: var(--accent);
}

/* Hidden columns */
.sidebar.hidden { display: none !important; }
#center.hidden { display: none !important; }
#output-section {
  flex: 1 1 0;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}
#debugger-section {
  flex: 0 0 40%;
  display: flex;
  flex-direction: column;
  min-height: 80px;
  overflow: hidden;
}
#debugger-section.collapsed {
  flex: 0 0 auto;
  min-height: 0;
}
#debugger-section.collapsed #debugger-tabs,
#debugger-section.collapsed #debugger-content {
  display: none;
}
.sidebar-header {
  padding: 8px 12px;
  font-size: var(--app-font-size);
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-dim);
  font-weight: 600;
}
.explorer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.explorer-workspaces {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  padding: 0;
  border: none;
  border-radius: 3px;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
}
.explorer-workspaces:hover {
  background: var(--bg-hover);
  color: var(--text);
}
.explorer-workspaces:focus-visible {
  outline: 1px solid var(--accent);
}
.debugger-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}
.collapse-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  padding: 0;
  border: none;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  border-radius: 3px;
}
.collapse-toggle:hover {
  color: var(--text);
  background: var(--bg-hover);
}
.collapse-toggle svg {
  transition: transform 0.15s ease;
}
#debugger-section.collapsed .collapse-toggle svg {
  transform: rotate(180deg);
}

/* ---- File tree ---- */
#file-tree {
  --app-font-size: var(--files-font-size);
  padding: 4px 0;
}
.workspace-header { --app-font-size: var(--files-font-size); }
.file-entry {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 3px 12px;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.file-entry:hover { background: var(--bg-hover); }
.file-entry.selected { background: var(--bg-active); }
.file-entry .chevron {
  width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--text-dim);
}
.file-entry.file .chevron { display: none; }
.file-entry .chevron svg { display: block; }
.file-entry .icon {
  width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.file-entry .icon svg { display: block; }
.icon-folder { color: var(--yellow); }
.icon-workspace { color: var(--purple); }
.icon-asm { color: var(--blue); }
.icon-file { color: var(--text-dim); }
.file-entry.workspace .name { font-weight: 600; }
.file-entry.action { color: var(--accent); }
.file-entry.action .name { font-weight: 600; }
.file-entry .name { overflow: hidden; text-overflow: ellipsis; }
.file-children {
  margin-left: 12px;
  border-left: 1px solid var(--border);
  padding-left: 0;
}
.workspace-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  cursor: pointer;
  font-weight: 600;
  border-bottom: 1px solid var(--border);
}
.workspace-header:hover { background: var(--bg-hover); }
.workspace-header.static { cursor: default; }
.workspace-header.static:hover { background: transparent; }
.workspace-header .icon {
  width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.workspace-header .icon svg { display: block; }
.workspace-header .name { overflow: hidden; text-overflow: ellipsis; }
.workspace-header .workspace-label {
  color: var(--text-dim);
  font-weight: 400;
  font-size: var(--app-font-size);
  flex-shrink: 0;
}
.file-tree-empty {
  padding: 12px;
  color: var(--text-dim);
  font-size: var(--app-font-size);
  line-height: 1.4;
}

/* ---- Center / editor ---- */
#center {
  flex: 1 1 0;
  display: flex;
  flex-direction: column;
  min-width: 200px;
}
#tab-bar {
  position: relative;
  display: flex;
  min-width: 0;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  overflow: visible;
  flex-shrink: 0;
}
.tab {
  display: flex;
  flex: 0 0 auto;
  min-width: 0;
  max-width: 220px;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  cursor: pointer;
  border-right: 1px solid var(--border);
  white-space: nowrap;
  color: var(--text-dim);
  background: var(--bg-panel);
}
.tab > span:first-child {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}
.tab[hidden] { display: none; }
.tab.active {
  background: var(--bg-editor);
  color: var(--text-bright);
  border-top: 2px solid var(--accent);
}
.tab .close {
  flex: 0 0 auto;
  cursor: pointer;
  color: var(--text-dim);
  font-size: var(--app-font-size);
  line-height: 1;
}
.tab .close:hover { color: var(--text-bright); }
.tab-overflow-button {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  display: none;
  width: 32px;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 0;
  border-left: 1px solid var(--border);
  background: var(--bg-panel);
  color: var(--text-dim);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  z-index: 2;
}
.tab-overflow-button.visible { display: flex; }
.tab-overflow-button:hover,
.tab-overflow-button[aria-expanded="true"] {
  background: var(--bg-hover);
  color: var(--text-bright);
}
.tab-overflow-menu {
  position: absolute;
  top: 100%;
  right: 0;
  z-index: 20;
  min-width: 180px;
  max-width: min(320px, 90vw);
  max-height: min(60vh, 420px);
  overflow-y: auto;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: var(--bg-panel);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
}
.tab-overflow-menu[hidden] { display: none; }
.tab-overflow-item {
  display: block;
  width: 100%;
  overflow: hidden;
  padding: 6px 8px;
  border: 0;
  background: transparent;
  color: var(--text);
  font: var(--app-font-size) var(--font-ui);
  text-align: left;
  text-overflow: ellipsis;
  white-space: nowrap;
  cursor: pointer;
}
.tab-overflow-item:hover,
.tab-overflow-item.active {
  background: var(--bg-hover);
  color: var(--text-bright);
}
.tab .dirty { color: var(--yellow); }
#editor-container { flex: 1; min-height: 0; }

/* ---- Debugger panels (tabbed) ---- */
#debugger-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.debugger-tab {
  padding: 6px 12px;
  cursor: pointer;
  color: var(--text-dim);
  border-right: 1px solid var(--border);
  white-space: nowrap;
}
.debugger-tab.active {
  color: var(--text-bright);
  background: var(--bg-editor);
  border-top: 2px solid var(--accent);
}
#debugger-content {
  flex: 1;
  min-height: 0;
  overflow: hidden;
}
.debugger-panel {
  display: none;
  height: 100%;
  overflow-y: auto;
}
.debugger-panel.active { display: block; }
.memory-toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 8px;
  margin-left: auto;
  font-size: var(--app-font-size);
  color: var(--text-dim);
}
.memory-toolbar input {
  width: 72px;
  padding: 3px 5px;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: var(--bg-editor);
  color: var(--text);
  font: var(--app-font-size) var(--font-mono);
}
.memory-toolbar button {
  padding: 3px 8px;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  font-size: var(--app-font-size);
}
.memory-toolbar button:hover { background: var(--bg-hover); }
.panel-body { padding: 6px 12px; font-family: var(--font-mono); font-size: var(--app-font-size); }

/* Registers */
.reg-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 12px;
}
.reg-row {
  display: flex;
  justify-content: space-between;
  padding: 1px 0;
}
.reg-row .reg-name { color: var(--blue); }
.reg-row .reg-value { color: var(--text-bright); }
.reg-row.changed .reg-value { color: var(--green); }
.reg-row.reg-flags {
  grid-column: 1 / -1;
}

/* Memory */
#memory {
  white-space: pre;
  line-height: 1.4;
}
.mem-addr { color: var(--text-dim); }
.mem-byte { color: var(--text); }
.mem-byte.changed { color: var(--green); }
.mem-byte.pc { background: #add8e6; color: #1e1e1e; }

/* Breakpoints */
.bp-row {
  display: flex;
  justify-content: space-between;
  padding: 2px 0;
  cursor: pointer;
}
.bp-row:hover { background: var(--bg-hover); }
.bp-row .bp-addr { color: var(--orange); }
.bp-row .bp-del { color: var(--red); cursor: pointer; }

/* ---- Output panel (far right column) ---- */
#output-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.output-tab {
  padding: 6px 12px;
  cursor: pointer;
  color: var(--text-dim);
  border-right: 1px solid var(--border);
  white-space: nowrap;
}
.output-tab.active {
  color: var(--text-bright);
  background: var(--bg-editor);
  border-top: 2px solid var(--accent);
}
#output-content { flex: 1; overflow: hidden; position: relative; }
.output-panel {
  display: none;
  height: 100%;
  overflow-y: auto;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: var(--app-font-size);
}
.output-panel.active { display: block; }
#output-panel {
  overflow: hidden;
  display: none;
  flex-direction: column;
}
#output-panel.active { display: flex; }

/* Terminal toolbar */
#terminal-toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding-bottom: 6px;
  margin-bottom: 6px;
  border-bottom: 1px solid var(--border);
}
.terminal-size-label {
  color: var(--text-dim);
  font-size: var(--app-font-size);
}
#terminal-size,
#terminal-control-char {
  background: var(--bg-editor);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: var(--app-font-size);
  font-family: var(--font-ui);
}
#btn-clear-terminal {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 2px 8px;
  border-radius: 3px;
  cursor: pointer;
  font-size: var(--app-font-size);
}
#btn-clear-terminal:hover { background: var(--bg-hover); }
#terminal-font-controls {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}
#terminal-font-size {
  color: var(--text-dim);
  font-size: var(--app-font-size);
  font-family: var(--font-ui);
}
#terminal-font-controls button {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 2px 6px;
  border-radius: 3px;
  cursor: pointer;
  font-size: var(--app-font-size);
  font-family: var(--font-ui);
}
#terminal-font-controls button:hover { background: var(--bg-hover); }

/* Terminal grid */
#output {
  position: relative;
  flex: 1;
  box-sizing: content-box;
  white-space: pre;
  font-family: var(--font-mono);
  font-size: var(--terminal-font-size);
  line-height: 1.35;
  overflow: hidden;
  background: var(--terminal-bg, #000);
  color: var(--terminal-fg, #c0c0c0);
  padding: 8px;
  border-radius: 3px;
  min-height: 0;
}
.terminal-screen {
  display: block;
  margin: 0;
  white-space: pre;
}
.terminal-blink {
  animation: terminal-blink 1s step-end infinite;
}
@keyframes terminal-blink {
  50% { visibility: hidden; }
}
.terminal-input {
  position: absolute;
  z-index: 1;
  height: 1.35em;
  padding: 0;
  border: 0;
  border-radius: 0;
  outline: none;
  background: transparent;
  color: var(--terminal-fg);
  font: inherit;
  line-height: 1.35;
  caret-color: var(--terminal-fg);
}
#output .error { color: var(--red); }
#output .success { color: var(--green); }
#output .info { color: var(--text-dim); }

/* Log panel */
#log {
  white-space: pre-wrap;
  word-break: break-all;
  font-family: var(--font-mono);
  font-size: var(--app-font-size);
}
#log .error { color: var(--red); }
#log .success { color: var(--green); }
#log .info { color: var(--text-dim); }

#listing, #symbols { white-space: pre; }
.listing-line {
  display: block;
  width: max-content;
  min-width: 100%;
  line-height: 1.4;
}
#listing .listing-line.current {
  background-color: #add8e6 !important;
  color: #1e1e1e;
  box-shadow: inset 3px 0 #007acc;
}
.listing-source-line { color: var(--text-dim); }
.listing-line.current .listing-source-line { color: #1e1e1e; }

/* ---- Status bar ---- */
#statusbar {
  height: calc(22px + env(safe-area-inset-bottom));
  background: var(--accent);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 12px env(safe-area-inset-bottom);
  font-size: var(--app-font-size);
  user-select: none;
  flex-shrink: 0;
}
#statusbar-left {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
#statusbar-right {
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
}
#statusbar-run-mode-label {
  font-size: var(--app-font-size);
}
#statusbar-run-mode {
  max-width: 62px;
  padding: 1px 2px;
  border: 0;
  border-radius: 2px;
  background: transparent;
  color: inherit;
  font: inherit;
  font-size: var(--app-font-size);
  cursor: pointer;
}
#statusbar-run-mode option {
  background: var(--bg-panel);
  color: var(--text);
}
#statusbar-theme {
  cursor: pointer;
  padding: 0 4px;
  border-radius: 2px;
}
#statusbar-theme:hover {
  background: rgba(255, 255, 255, 0.2);
}
.statusbar-sep {
  width: 1px;
  height: 12px;
  background: rgba(255, 255, 255, 0.4);
}

/* Scrollbars */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #424242; border-radius: 5px; }
::-webkit-scrollbar-thumb:hover { background: #4f4f4f; }

/* ---- Modal dialogs ---- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.modal-overlay[hidden] {
  display: none;
}
.modal {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  min-width: 320px;
  max-width: 480px;
  width: 90%;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}
.modal-title {
  font-size: var(--app-font-size);
  font-weight: 600;
  color: var(--text-bright);
}
.modal-close {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: var(--app-font-size);
  line-height: 1;
  cursor: pointer;
  padding: 0 4px;
  border-radius: 3px;
}
.modal-close:hover {
  color: var(--text-bright);
  background: var(--bg-hover);
}
.modal-body {
  padding: 16px;
  color: var(--text);
  font-size: var(--app-font-size);
  line-height: 1.5;
  word-break: break-word;
}
.about-dialog h2 {
  margin-bottom: 4px;
  color: var(--text-bright);
  font-size: 16px;
}
.about-dialog p + p { margin-top: 12px; }
.about-dialog .about-version {
  margin-bottom: 16px;
  color: var(--text-dim);
}
.modal-body input[type="text"] {
  width: 100%;
  box-sizing: border-box;
  padding: 6px 8px;
  background: var(--bg);
  color: var(--text-bright);
  border: 1px solid var(--border);
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: var(--app-font-size);
  outline: none;
}
.modal-body input[type="text"]:focus {
  border-color: var(--accent);
}
.agent-field {
  display: block;
  margin-bottom: 12px;
  color: var(--text-dim);
}
.agent-field input,
.agent-field textarea {
  display: block;
  box-sizing: border-box;
  width: 100%;
  margin-top: 5px;
  padding: 7px 8px;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: var(--bg);
  color: var(--text-bright);
  font: inherit;
}
.agent-field textarea {
  min-height: 100px;
  resize: vertical;
  font-family: var(--font-mono);
}
.agent-field input:focus,
.agent-field textarea:focus {
  border-color: var(--accent);
  outline: none;
}
.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding: 12px 16px;
  border-top: 1px solid var(--border);
}
.modal-btn {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: var(--bg-toolbar);
  color: var(--text);
  font-size: var(--app-font-size);
  cursor: pointer;
}
.modal-btn:hover {
  background: var(--bg-hover);
}
.modal-btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}
.modal-btn.primary:hover {
  background: var(--accent-hover);
}
.modal-btn.danger {
  background: var(--red);
  border-color: var(--red);
  color: #ffffff;
}
.modal-btn.danger:hover {
  filter: brightness(1.1);
}

/* ---- Settings window ---- */
.settings-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.settings-overlay[hidden] {
  display: none;
}
.settings-window {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 6px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  width: 720px;
  max-width: 92vw;
  height: 480px;
  max-height: 84vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.settings-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}
.settings-title {
  font-size: var(--app-font-size);
  font-weight: 600;
  color: var(--text-bright);
}
.settings-body {
  display: flex;
  flex: 1 1 0;
  min-height: 0;
}
.settings-sidebar {
  width: 200px;
  flex-shrink: 0;
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 8px 0;
  background: var(--bg-sidebar);
}
.settings-nav-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  cursor: pointer;
  color: var(--text);
  font-size: var(--app-font-size);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.settings-nav-item:hover {
  background: var(--bg-hover);
}
.settings-nav-item.active {
  background: var(--bg-active);
  color: var(--text-bright);
}
.settings-nav-item .icon {
  width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--text-dim);
}
.settings-nav-item.active .icon {
  color: var(--accent);
}
.settings-nav-item .icon svg {
  display: block;
}
.settings-content {
  flex: 1 1 0;
  min-width: 0;
  overflow-y: auto;
  padding: 20px 24px;
}
.settings-section-title {
  font-size: var(--app-font-size);
  font-weight: 600;
  color: var(--text-bright);
  margin-bottom: 4px;
}
.settings-section-desc {
  font-size: var(--app-font-size);
  color: var(--text-dim);
  margin-bottom: 20px;
}
.settings-field {
  margin-bottom: 20px;
}
.settings-field-label {
  display: block;
  font-size: var(--app-font-size);
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}
.settings-field input[type="text"],
.settings-field input[type="number"],
.settings-field input[type="password"],
.settings-field select {
  width: 100%;
  box-sizing: border-box;
  padding: 6px 8px;
  background: var(--bg);
  color: var(--text-bright);
  border: 1px solid var(--border);
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: var(--app-font-size);
  outline: none;
}
.settings-field input[type="text"]:focus,
.settings-field input[type="number"]:focus,
.settings-field input[type="password"]:focus,
.settings-field select:focus {
  border-color: var(--accent);
}
.settings-field-hint {
  font-size: var(--app-font-size);
  color: var(--text-dim);
  margin-top: 6px;
  line-height: 1.4;
}
.settings-form-message {
  color: var(--red);
  font-size: var(--app-font-size);
  margin-bottom: 12px;
}
.settings-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 8px;
}

/* ---- Workspace picker (Open Workspace dialog) ---- */
.workspace-picker {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 320px;
  max-height: 320px;
  overflow-y: auto;
}
.workspace-picker-location {
  font-size: var(--app-font-size);
  color: var(--text-dim);
  font-family: var(--font-mono);
  padding: 4px 8px;
  margin-bottom: 6px;
  border-bottom: 1px solid var(--border);
  word-break: break-all;
}
.workspace-picker-empty {
  padding: 12px 8px;
  color: var(--text-dim);
  font-size: var(--app-font-size);
}
.workspace-picker-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  cursor: pointer;
  border-radius: 3px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.workspace-picker-item:hover {
  background: var(--bg-hover);
}
.workspace-picker-item .icon {
  width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--purple);
}
.workspace-picker-item .icon svg {
  display: block;
}
.workspace-picker-item .name {
  overflow: hidden;
  text-overflow: ellipsis;
  font-weight: 600;
}

/* File picker (Open File dialog) */
.file-picker {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 320px;
  max-height: 360px;
}
.file-picker-location {
  font-size: var(--app-font-size);
  color: var(--text-dim);
  font-family: var(--font-mono);
  padding: 4px 8px;
  margin-bottom: 6px;
  border-bottom: 1px solid var(--border);
  word-break: break-all;
}
.file-picker-list {
  overflow-y: auto;
  flex: 1;
}
.file-picker-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 8px;
  cursor: pointer;
  border-radius: 3px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.file-picker-item:hover {
  background: var(--bg-hover);
}
.file-picker-item .icon {
  width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--purple);
}
.file-picker-item .icon.icon-asm {
  color: var(--blue);
}
.file-picker-item .icon.icon-file {
  color: var(--text-dim);
}
.file-picker-item .icon svg {
  display: block;
}
.file-picker-item .name {
  overflow: hidden;
  text-overflow: ellipsis;
}
.file-picker-item.file-picker-up {
  color: var(--text-dim);
  font-style: italic;
}
.file-picker-empty {
  padding: 12px 8px;
  color: var(--text-dim);
  font-size: var(--app-font-size);
}

/* ---- Mobile workspace ---- */
@media (max-width: 760px) {
  #menubar {
    flex-shrink: 0;
    overflow-x: auto;
  }
  #menubar-title {
    display: none;
  }
  .menu-item {
    padding-right: 8px;
    padding-left: 8px;
  }
  #toolbar {
    flex-shrink: 0;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: none;
  }
  #toolbar::-webkit-scrollbar {
    display: none;
  }
  #toolbar button,
  .toolbar-sep {
    flex-shrink: 0;
  }
  #status-text {
    display: none;
  }
  #main.mobile-layout {
    flex-direction: column;
    min-height: 0;
    overflow: hidden;
    touch-action: none;
  }
  .mobile-layout #activity-bar {
    width: 100%;
    height: 42px;
    flex: 0 0 42px;
    flex-direction: row;
    justify-content: flex-start;
    padding: 1px 6px;
    border-right: 0;
    border-bottom: 1px solid var(--border);
    overflow: hidden;
  }
  .mobile-layout .activity-icon {
    flex: 1 1 0;
    min-width: 0;
    margin: 0;
  }
  .mobile-layout #sidebar-left {
    display: none !important;
  }
  .mobile-layout #sidebar-left.mobile-panel-open {
    display: flex !important;
    flex-direction: column;
    width: 100%;
    min-width: 0;
    min-height: 0;
    max-height: none;
    flex: 1 1 0;
    border-right: 0;
    border-top: 1px solid var(--border);
    overflow: hidden;
  }
  .mobile-layout #sidebar-left.mobile-panel-open #file-tree {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
  }
  .mobile-layout #divider-left,
  .mobile-layout #divider-right,
  .mobile-layout #divider-agent {
    display: none !important;
  }
  .mobile-layout #center {
    flex: 1 1 0;
    min-width: 0;
    min-height: 0;
  }
  .mobile-layout.mobile-panel-visible #center {
    display: none !important;
  }
  .mobile-layout #output-tabs {
    overflow-x: auto;
  }
  .mobile-layout #terminal-toolbar {
    flex-wrap: wrap;
  }
  .mobile-layout #debugger-tabs {
    flex-wrap: wrap;
  }
  .mobile-layout .memory-toolbar {
    flex: 1 0 100%;
    justify-content: flex-start;
    margin-left: 0;
  }
  .mobile-layout #sidebar-right:not(.mobile-panel-open),
  .mobile-layout #agent-column:not(.mobile-panel-open) {
    display: none !important;
  }
  .mobile-layout #sidebar-right.mobile-panel-open,
  .mobile-layout #agent-column.mobile-panel-open {
    width: 100%;
    min-width: 0;
    min-height: 0;
    max-height: none;
    flex: 1 1 0;
    border-left: 0;
    border-top: 1px solid var(--border);
    overflow: hidden;
  }
  .mobile-layout ~ #statusbar {
    justify-content: center;
    padding: 0 6px env(safe-area-inset-bottom);
  }
  .mobile-layout ~ #statusbar-right {
    gap: 5px;
  }
}

@media (max-width: 420px) {
  #statusbar-cursor,
  #statusbar-run-mode-label,
  #statusbar-right .statusbar-sep {
    display: none;
  }
}