:root {
  --bg: #1e1e1e;
  --bg-alt: #252526;
  --sidebar-bg: #252526;
  --border: #333333;
  --accent: #007acc;
  --text: #d4d4d4;
  --text-muted: #9f9f9f;
  --terminal-bg: #1e1e1e;
  --terminal-text: #d4d4d4;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: #000;
  color: var(--text);
  font-family: var(--font-sans);
}


body {
  display: flex;
  justify-content: center;
  align-items: stretch;
  overflow: hidden;
}

.vscode-window {
  display: flex;
  flex-direction: column;
  width: 100%;
  /* max-width: 1200px; */
  margin: 0 auto;
  height: 100vh;
  background: var(--bg);
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
}

/* titlebar */

.titlebar {
  height: 6px;
  background: #3c3c3c;
  display: flex;
  align-items: center;
  padding: 0 8px;
  font-size: 12px;
  color: var(--text-muted);
  user-select: none;
  overflow: hidden;
  transition: height 0.3s ease;
}

.titlebar.expanded {
  height: 32px;
}

.titlebar-left,
.titlebar-center,
.titlebar-right {
  opacity: 0;
  transition: opacity 0.2s ease;
}

.titlebar.expanded .titlebar-left,
.titlebar.expanded .titlebar-center,
.titlebar.expanded .titlebar-right {
  opacity: 1;
}

.titlebar-left,
.titlebar-right {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 160px;
}

.titlebar-center {
  flex: 1;
  text-align: center;
}

.traffic-light {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 9999px;
  margin-right: 4px;
}

.traffic-light.red {
  background: #ff5f56;
}
.traffic-light.yellow {
  background: #ffbd2e;
}
.traffic-light.green {
  background: #27c93f;
}

/* main layout */

.vscode-main {
  flex: 1;
  display: flex;
  min-height: 0;
}

/* sidebar */

.sidebar {
  width: 220px;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  padding: 8px 8px 0 8px;
  font-size: 12px;
  color: var(--text-muted);
}

.sidebar-title {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.sidebar-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar-item {
  padding: 2px 4px;
  border-radius: 3px;
  cursor: default;
}

.sidebar-item:hover {
  background: #2a2d2e;
}

/* 文件夹展开/折叠 */
.sidebar-item.folder {
  display: flex;
  align-items: center;
  cursor: pointer;
  user-select: none;
}

.folder-arrow {
  display: inline-block;
  width: 16px;
  height: 16px;
  margin-right: 2px;
  position: relative;
}

.folder-arrow::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 5px;
  border: 4px solid transparent;
  border-left: 5px solid var(--text-muted);
  transition: transform 0.15s ease;
}

.sidebar-item.folder.expanded .folder-arrow::before {
  transform: rotate(90deg);
  left: 3px;
  top: 6px;
}

.folder-name {
  color: #cccccc;
}

.folder-children {
  padding-left: 12px;
}

.folder-children.collapsed {
  display: none;
}

.sidebar-item.file {
  padding-left: 22px;
}

/* editor */

.editor {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: var(--bg-alt);
}

.editor-tabbar {
  height: 32px;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--border);
  background: #252526;
  scrollbar-width: none;
}

.editor-tab {
  padding: 0 12px;
  height: 100%;
  display: flex;
  align-items: center;
  font-size: 12px;
  color: var(--text-muted);
  border-right: 1px solid var(--border);
}

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

.editor-content {
  flex: 1;
  padding: 16px 20px;
  font-size: 14px;
  overflow-y: auto;
}

.editor-content h1 {
  font-size: 22px;
  margin-top: 0;
}

.editor-content pre {
  background: #1e1e1e;
  padding: 10px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  overflow-x: auto;
}

.editor-content.preview,
.terminal-output{
  scrollbar-color: var(--sb-thumb) var(--sb-track);
  scrollbar-width: thin;
}

/* terminal */

.terminal {
  border-top: 1px solid var(--border);
  background: var(--terminal-bg);
  font-family: var(--font-mono);
  font-size: 12px;
  display: flex;
  flex-direction: column;
  height: 180px;
}

.terminal-header {
  height: 28px;
  display: flex;
  align-items: center;
  padding: 0 8px;
  border-bottom: 1px solid var(--border);
  color: var(--text-muted);
}

.terminal-output {
  flex: 1;
  padding: 8px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.terminal-line {
  display: flex;
  align-items: baseline;
}

.terminal-line span {
  margin-right: 4px;
}

.terminal-input-line {
  display: flex;
  align-items: center;
  padding: 6px 8px;
  border-top: 1px solid var(--border);
}

.terminal-prompt {
  color: #4ec9b0;
  margin-right: 6px;
}

.terminal-input {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--terminal-text);
  font-family: var(--font-mono);
  font-size: 12px;
  outline: none;
}

/* terminal messages */

.terminal-output .command {
  color: var(--text);
}

.terminal-output .output {
  color: var(--terminal-text);
}

.terminal-output .output-muted {
  color: var(--text-muted);
}

.terminal-output .output-error {
  color: #f44747;
}

.terminal-output .output-highlight {
  color: var(--accent);
}

/* small screens */

@media (max-width: 768px) {
  .sidebar {
    display: none;
  }
}

/* ====== Tabs ====== */
.tabs {
  display: flex;
  align-items: center;
  gap: 0;
  overflow-x: auto;
}
.tab {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 12px;
  height: 32px;
  font-size: 12px;
  color: var(--text-muted);
  border-right: 1px solid var(--border);
  background: #252526;
  cursor: pointer;
  user-select: none;
}
.tab.active {
  background: var(--bg);
  color: var(--text);
}
.tab .close {
  opacity: 0.7;
}
.tab:hover .close {
  opacity: 1;
}

/* ====== Preview ====== */
.preview {
  line-height: 1.6;
}
.preview h1, .preview h2, .preview h3 {
  margin-top: 1em;
}
.preview pre code {
  display: block;
  padding: 12px;
  border-radius: 6px;
  background: #1e1e1e;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 12px;
}
.preview code {
  background: #1e1e1e;
  padding: 2px 4px;
  border-radius: 3px;
}
.preview blockquote {
  margin: 0;
  padding-left: 12px;
  border-left: 3px solid #3a3a3a;
  color: var(--text-muted);
}

/*
.sidebar-item {
  padding: 4px 6px;
  border-radius: 3px;
  cursor: pointer;
}
.sidebar-item:hover { background: #2a2d2e; }
.sidebar-item.folder { color: #9fd3ff; }
.sidebar-item.file { color: var(--text); }

.editor {
  display: flex;
  flex-direction: column;
}
.editor-content.preview {
  flex: 1;
  overflow: auto;
  padding: 0 0 16px 0;
}

.pdf-frame {
  width: 100%;
  height: 100%;
  border: 0;
}

.pdf-viewer {
  padding: 12px 0 24px;
}
.pdf-canvas {
  display: block;
  width: 100%;
  height: auto;
  margin: 0 auto 12px;
  background: #1e1e1e;
  border-radius: 4px;
}
  */

/* 尺寸变量（默认值） */
:root {
  --sidebar-width: 220px;
  --terminal-height: 120px;
  --resizer-size: 4px;
}

/* 布局：main 横向排，sidebar 固定宽度，editor 占满 */
.vscode-main {
  display: flex;
  min-height: 0;
  flex: 1;
}

.sidebar {
  width: var(--sidebar-width);
  min-width: 140px;
  max-width: 60vw;
}

/* 竖向分隔条：拖拽改变 sidebar 宽度 */
.resizer-vertical {
  width: var(--resizer-size);
  cursor: col-resize;
  background: transparent;
}
.resizer-vertical:hover,
.resizer-vertical.dragging { background: #2a2d2e; }

/* 横向分隔条：拖拽改变 terminal 高度 */
.resizer-horizontal {
  height: var(--resizer-size);
  cursor: row-resize;
  background: transparent;
  border-top: 1px solid var(--border);
}
.resizer-horizontal:hover,
.resizer-horizontal.dragging { background: #2a2d2e; }

/* 终端高度由变量控制 */
.terminal {
  height: var(--terminal-height);
  min-height: 120px;
  max-height: 70vh;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

/* 让编辑器区垂直撑满（上面已用 calc 扣掉 terminal 高度） */
.editor { display: flex; flex-direction: column; }
.editor-content.preview { flex: 1; overflow: auto; }