:root {
  --bg-primary: #141414;
  --bg-secondary: #1c1c1c;
  --bg-tertiary: #242424;
  --bg-hover: #2e2e2e;
  --bg-active: #383838;
  --text-primary: #d4d4d4;
  --text-secondary: #8a8a8a;
  --text-muted: #5a5a5a;
  --border-color: #2a2a2a;
  --border-light: #333333;
  --accent: #e8a84c;
  --accent-dim: #c4872e;
  --accent-glow: rgba(232, 168, 76, 0.15);
  --danger: #e84c4c;
  --success: #4ce868;
  --info: #4ca8e8;
  --scrollbar-bg: #1c1c1c;
  --scrollbar-thumb: #3a3a3a;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --font-sans: 'Inter', 'Segoe UI', system-ui, sans-serif;
  --font-display: 'Georgia', 'Times New Roman', serif;
}

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

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

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--scrollbar-bg); }
::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #4a4a4a; }

#app { display: flex; flex-direction: column; height: 100vh; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 42px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 0 12px;
  flex-shrink: 0;
}

.topbar-left { display: flex; align-items: center; gap: 8px; }

.logo { display: flex; align-items: center; gap: 6px; margin-right: 16px; }

.logo-icon {
  color: var(--accent);
  font-size: 18px;
  line-height: 1;
}

.logo-text {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--text-primary);
}

.logo-ide {
  color: var(--accent);
  font-style: italic;
}

.topbar-menu { display: flex; align-items: center; gap: 2px; }

.tb-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-secondary);
  font-size: 12px;
  font-family: var(--font-sans);
  padding: 5px 10px;
  border-radius: 4px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 5px;
  transition: all 0.15s;
  white-space: nowrap;
}

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

.tb-btn:active { background: var(--bg-active); }

.run-btn {
  background: var(--accent);
  color: var(--bg-primary);
  font-weight: 600;
  border-color: var(--accent-dim);
}

.run-btn:hover { background: var(--accent-dim); color: var(--bg-primary); }

.domain-badge {
  font-family: var(--font-display);
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.5px;
  padding: 3px 8px;
  border: 1px solid var(--border-color);
  border-radius: 3px;
  background: var(--bg-tertiary);
}

.main-layout {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.sidebar {
  width: 220px;
  min-width: 180px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  flex-shrink: 0;
}

.sidebar-section { padding: 8px 0; border-bottom: 1px solid var(--border-color); }

.sidebar-title {
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--text-muted);
  padding: 4px 12px 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.sidebar-title i { font-size: 10px; color: var(--accent-dim); }

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

.file-tree-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  border-radius: 3px;
  cursor: pointer;
  font-size: 12px;
  color: var(--text-secondary);
  transition: all 0.1s;
  user-select: none;
}

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

.file-tree-item i { font-size: 11px; min-width: 14px; text-align: center; }
.file-tree-item .fi-folder { color: var(--accent); }
.file-tree-item .fi-js { color: #f0db4f; }
.file-tree-item .fi-py { color: #4ca8e8; }
.file-tree-item .fi-html { color: #e86c4c; }
.file-tree-item .fi-css { color: #4ce8d4; }
.file-tree-item .fi-json { color: #a8a8a8; }
.file-tree-item .fi-md { color: #8ae84c; }
.file-tree-item .fi-default { color: var(--text-muted); }

.file-tree-dir { padding-left: 8px; }

.sandbox-info {
  font-size: 11px;
  color: var(--text-muted);
  padding: 4px 12px;
  font-family: var(--font-mono);
}

.editor-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

.tabs-bar {
  display: flex;
  align-items: stretch;
  height: 34px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  overflow-x: auto;
  flex-shrink: 0;
}

.tab-item {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 0 14px;
  font-size: 12px;
  color: var(--text-secondary);
  border-right: 1px solid var(--border-color);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.1s;
  position: relative;
  min-width: 0;
}

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

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

.tab-item.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
}

.tab-close {
  font-size: 10px;
  padding: 2px;
  border-radius: 2px;
  color: var(--text-muted);
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.1s;
}

.tab-item:hover .tab-close { opacity: 1; }
.tab-close:hover { color: var(--danger); background: rgba(232, 76, 76, 0.15); }

.editor-wrapper { flex: 1; overflow: hidden; }

.CodeMirror {
  height: 100% !important;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.55;
  background: var(--bg-primary) !important;
}

.CodeMirror-gutters {
  background: var(--bg-secondary) !important;
  border-right: 1px solid var(--border-color) !important;
}

.terminal-panel {
  height: 180px;
  min-height: 28px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.terminal-panel.collapsed { height: 28px; }

.terminal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 28px;
  padding: 0 10px;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

.terminal-title {
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.terminal-title i { font-size: 10px; color: var(--accent-dim); }

.terminal-controls { display: flex; gap: 4px; }

.terminal-controls button {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 11px;
  cursor: pointer;
  padding: 2px 5px;
  border-radius: 2px;
}

.terminal-controls button:hover { color: var(--text-primary); background: var(--bg-hover); }

.terminal-body {
  flex: 1;
  overflow-y: auto;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-secondary);
}

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

.terminal-line { margin-bottom: 1px; }
.terminal-line.welcome { color: var(--accent-dim); }
.terminal-line.error { color: var(--danger); }
.terminal-line.success { color: var(--success); }
.terminal-line.info { color: var(--info); }

.ai-panel {
  width: 380px;
  min-width: 320px;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.ai-panel.collapsed { display: none; }

.ai-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 34px;
  padding: 0 12px;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-tertiary);
}

.ai-title {
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.ai-title i { color: var(--accent-dim); font-size: 11px; }

.ai-toggle-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 12px;
  padding: 4px;
  border-radius: 3px;
}

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

.ai-model-selector { padding: 8px 12px; border-bottom: 1px solid var(--border-color); }

.model-dropdown-wrap { position: relative; }

.model-dropdown-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 10px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  color: var(--text-primary);
  font-size: 12px;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all 0.15s;
}

.model-dropdown-btn:hover { border-color: var(--accent-dim); }

.model-dropdown-btn.active { border-color: var(--accent); }

.model-dropdown-btn i { font-size: 10px; color: var(--text-muted); }

.model-dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  max-height: 280px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  border-radius: 4px;
  z-index: 1000;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
  overflow: hidden;
}

.model-dropdown-menu.open { display: flex; flex-direction: column; }

.model-search-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-secondary);
}

.model-search-wrap i { font-size: 11px; color: var(--text-muted); }

.model-search-wrap input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 12px;
  font-family: var(--font-sans);
}

.model-search-wrap input::placeholder { color: var(--text-muted); }

.model-list {
  overflow-y: auto;
  max-height: 230px;
}

.model-item {
  padding: 6px 10px;
  font-size: 11px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.1s;
  font-family: var(--font-mono);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.model-item:hover { background: var(--bg-hover); color: var(--text-primary); }
.model-item.selected { background: var(--accent-glow); color: var(--accent); }

.ai-chat { flex: 1; overflow: hidden; display: flex; flex-direction: column; }

.ai-messages { flex: 1; overflow-y: auto; padding: 12px; }

.ai-msg { margin-bottom: 12px; }

.ai-msg-content {
  font-size: 12px;
  line-height: 1.6;
  color: var(--text-primary);
  padding: 8px 10px;
  border-radius: 6px;
  max-width: 100%;
  word-wrap: break-word;
}

.ai-msg-system .ai-msg-content {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-style: italic;
}

.ai-msg-user .ai-msg-content {
  background: var(--accent-glow);
  border: 1px solid var(--accent-dim);
  color: var(--accent);
  margin-left: 20px;
}

.ai-msg-assistant .ai-msg-content {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  color: var(--text-primary);
  margin-right: 20px;
}

.ai-msg-label {
  font-family: var(--font-display);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: 3px;
  padding-left: 2px;
}

.ai-msg-user .ai-msg-label { text-align: right; color: var(--accent-dim); }

.ai-input-area {
  padding: 10px 12px;
  border-top: 1px solid var(--border-color);
  background: var(--bg-tertiary);
}

.ai-input-wrap {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: 6px;
  padding: 8px 10px;
  transition: border-color 0.15s;
}

.ai-input-wrap:focus-within { border-color: var(--accent); }

#ai-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 12px;
  font-family: var(--font-sans);
  resize: none;
  max-height: 120px;
  line-height: 1.5;
}

#ai-input::placeholder { color: var(--text-muted); }

.ai-send-btn {
  background: var(--accent);
  color: var(--bg-primary);
  border: none;
  border-radius: 4px;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 12px;
  flex-shrink: 0;
  transition: background 0.15s;
}

.ai-send-btn:hover { background: var(--accent-dim); }

.statusbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 24px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 0 12px;
  font-size: 11px;
  color: var(--text-muted);
  flex-shrink: 0;
}

.status-left, .status-right { display: flex; align-items: center; gap: 8px; }

.status-sep { color: var(--border-light); }

.ai-confirm-modal {
  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: 9000;
}

.ai-confirm-box {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 24px;
  max-width: 560px;
  width: 90%;
  box-shadow: 0 16px 48px rgba(0,0,0,0.5);
}

.ai-confirm-title {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.ai-confirm-filename {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-primary);
  margin-bottom: 10px;
  padding: 4px 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
}

.ai-confirm-preview {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-secondary);
  max-height: 260px;
  overflow-y: auto;
  margin-bottom: 16px;
  white-space: pre-wrap;
  word-break: break-all;
}

.ai-confirm-actions { display: flex; gap: 10px; }

.confirm-yes, .confirm-no {
  flex: 1;
  padding: 10px 16px;
  border-radius: 4px;
  border: 1px solid transparent;
  font-size: 13px;
  font-family: var(--font-sans);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all 0.15s;
}

.confirm-yes {
  background: var(--accent);
  color: var(--bg-primary);
  border-color: var(--accent-dim);
  font-weight: 600;
}

.confirm-yes:hover { background: var(--accent-dim); }

.confirm-no {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border-color: var(--border-light);
}

.confirm-no:hover { background: var(--bg-hover); color: var(--text-primary); }

.overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 8000;
}

.overlay-box {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 24px;
  max-width: 480px;
  width: 90%;
}

.overlay-title {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.overlay-body { margin-bottom: 16px; }

.overlay-actions { display: flex; justify-content: flex-end; }

.drag-over {
  outline: 2px dashed var(--accent);
  outline-offset: -4px;
}

@media (max-width: 900px) {
  .sidebar { width: 180px; min-width: 150px; }
  .ai-panel { width: 300px; min-width: 260px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}