/* ===========================
  全局 & 重置
=========================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* 护眼亮色主题 - 米白/浅绿系 */
  --bg: #e8efe4;
  --bg-panel: #f4f8f0;
  --bg-header: #d6e0cf;
  --bg-output: #f9fcf7;
  --bg-sidebar: #edf2ea;
  --border: #c2cdb8;
  --text: #2d3a28;
  --text-muted: #6b7d63;
  --accent: #4a7c59;
  --accent-hover: #3d6649;
  --green: #3a6b35;
  --red: #b0392b;
  --yellow: #a07b2a;
  --mauve: #6b4f8a;
  --header-h: 52px;
  --sidebar-w: 260px;
  --sidebar-collapsed-w: 40px;
  --bottom-h: 180px;
}

html, body {
  height: 100%;
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
}

/* ===========================
  Header
=========================== */
.header {
  height: var(--header-h);
  background: var(--bg-header);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  gap: 12px;
  flex-shrink: 0;
}

.header-left {
  flex: 1;
  display: flex;
  align-items: center;
}

.header-center {
  flex-shrink: 0;
}

.logo {
  font-size: 16px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.3px;
}

.brand-link {
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
  padding: 5px 12px;
  border-radius: 6px;
  border: 1.5px solid var(--accent);
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
  letter-spacing: 0.3px;
}

.brand-link:hover {
  background: var(--accent);
  color: #fff;
}

.header-right {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 6px;
  flex-shrink: 0;
}

.header-sep {
  width: 1px;
  height: 20px;
  background: var(--border);
  margin: 0 4px;
}

.btn-font {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
  font-size: 12px;
  font-weight: 600;
  min-width: 30px;
  padding: 4px 8px;
  border-radius: 4px;
}

.btn-font:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(74, 124, 89, 0.08);
}

/* ===========================
  Buttons
=========================== */
.btn {
  padding: 6px 16px;
  border: none;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
  outline: none;
}

.btn:active { transform: scale(0.96); }

.btn-run {
  background: var(--green);
  color: #ffffff;
}
.btn-run:hover { opacity: 0.85; }

.btn-clear {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}
.btn-clear:hover { color: var(--text); border-color: var(--text-muted); }

.btn-secondary {
  background: transparent;
  color: var(--mauve);
  border: 1px solid var(--mauve);
}
.btn-secondary:hover { opacity: 0.75; }

.btn-turtle-sm {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
  font-size: 11px;
  padding: 3px 8px;
}
.btn-turtle-sm:hover { color: var(--accent); border-color: var(--accent); }

/* ===========================
  Main Layout（左右分栏）
=========================== */
.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
}

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

/* ===========================
  左侧：上下两部分
=========================== */
.left-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

/* 上：编辑器 + 画布 */
.top-area {
  flex: 1;
  display: flex;
  overflow: hidden;
  min-height: 0;
}

/* 下：输入 + 输出 */
.bottom-area {
  height: var(--bottom-h);
  flex-shrink: 0;
  display: flex;
  overflow: hidden;
  border-top: 1px solid var(--border);
}

/* ===========================
  编辑器
=========================== */
.editor-pane {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 150px;
}

#editor-container {
  flex: 1;
  overflow: auto;
  background: var(--bg-panel);
}

/* CodeMirror overrides */
#editor-container .cm-editor {
  height: 100%;
  font-size: 14px;
}

#editor-container .cm-scroller {
  font-family: 'Cascadia Code', 'Fira Code', 'JetBrains Mono', 'Consolas', monospace;
  overflow: auto;
}

/* ===========================
  竖向分隔条
=========================== */
.resizer-v {
  width: 5px;
  background: var(--border);
  flex-shrink: 0;
}

/* ===========================
  画布区域（固定尺寸）
=========================== */
.turtle-pane {
  flex: 0 0 600px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 150px;
  background: #ffffff;
  transition: flex 0.25s ease;
}

.turtle-pane.collapsed {
  flex: 0 0 36px;
  min-width: 0;
  overflow: hidden;
}

.turtle-pane.collapsed .turtle-body {
  display: none;
}

.turtle-pane.collapsed .turtle-header span,
.turtle-pane.collapsed .turtle-header-btns {
  display: none;
}

.turtle-pane.collapsed .turtle-header .syntax-toggle-btn {
  margin-left: 0;
}

.turtle-header {
  display: flex;
  align-items: center;
  padding: 5px 10px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  flex-shrink: 0;
  gap: 6px;
  min-height: 36px;
}

.turtle-header span {
  flex: 1;
}

.turtle-header-btns {
  display: flex;
  gap: 4px;
}

.turtle-header .syntax-toggle-btn {
  flex-shrink: 0;
}

.turtle-body {
  flex: 1;
  display: flex;
  overflow: hidden;
}

.turtle-canvas-wrap {
  position: relative;
  overflow: hidden;
  width: 600px;
  height: 400px;
}

.turtle-canvas-wrap canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 600px;
  height: 400px;
}

.turtle-canvas-wrap #grid-canvas {
  background: #ffffff;
}

.turtle-canvas-wrap #lines-canvas,
.turtle-canvas-wrap #turtle-canvas {
  background: transparent;
}

.turtle-canvas-wrap #turtle-canvas {
  pointer-events: none;
}

/* ===========================
  cin 输入
=========================== */
.cin-pane {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 80px;
  width: 33.3333%;
  border-right: 1px solid var(--border);
}

.cin-pane .pane-title {
  flex-shrink: 0;
}

.cin-pane .cin-textarea {
  flex: 1;
}

.cin-textarea {
  flex: 1;
  background: var(--bg-output);
  color: var(--text);
  border: none;
  outline: none;
  padding: 8px 12px;
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  font-size: 14px;
  line-height: 1.6;
  resize: none;
  min-height: 0;
}

.cin-textarea::placeholder {
  color: var(--text-muted);
  opacity: 0.6;
}

/* ===========================
  输出区
=========================== */
.output-pane {
  flex: 1;
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 150px;
}

.pane-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--text-muted);
  padding: 6px 12px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.pane-title-text {
  flex: 1;
}

.pane-title-btns {
  display: flex;
  gap: 4px;
}

#output-container {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  background: var(--bg-output);
  display: flex;
  flex-direction: column;
}

#output-container > * {
  flex-shrink: 0;
}

.output-content {
  padding: 10px 14px;
  font-family: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;
  font-size: 14px;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-all;
}

/* 输出区滚动条样式 */
#output-container::-webkit-scrollbar { width: 6px; }
#output-container::-webkit-scrollbar-track { background: transparent; }
#output-container::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}
#output-container::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

.output-hint {
  color: var(--text-muted);
  font-style: italic;
}

.output-line { display: block; }
.output-line.error { color: var(--red); }
.output-line.warn  { color: var(--yellow); }
.output-line.info  { color: var(--accent); }
.output-line.success { color: var(--green); }

.output-separator {
  display: block;
  border-top: 1px solid var(--border);
  margin: 8px 0;
}

/* ===========================
  右侧：语法参考边栏
=========================== */
.syntax-sidebar {
  width: var(--sidebar-w);
  background: var(--bg-sidebar);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: width 0.25s ease;
  overflow: hidden;
}

.syntax-sidebar.collapsed {
  width: var(--sidebar-collapsed-w);
}

.syntax-sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  min-height: 44px;
  background: var(--bg-header);
}

.syntax-sidebar-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  white-space: nowrap;
  overflow: hidden;
  transition: opacity 0.2s;
}

.syntax-sidebar.collapsed .syntax-sidebar-title {
  opacity: 0;
  width: 0;
}

.syntax-toggle-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 10px;
  padding: 4px 6px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s;
  flex-shrink: 0;
}

.syntax-toggle-btn:hover {
  color: var(--text);
  border-color: var(--accent);
  background: rgba(74, 124, 89, 0.1);
}

.syntax-sidebar-body {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  transition: opacity 0.2s;
}

.syntax-sidebar.collapsed .syntax-sidebar-body {
  opacity: 0;
  pointer-events: none;
}

/* 滚动条样式 */
.syntax-sidebar-body::-webkit-scrollbar { width: 4px; }
.syntax-sidebar-body::-webkit-scrollbar-track { background: transparent; }
.syntax-sidebar-body::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

/* ===========================
  语法参考内容
=========================== */
.syntax-reference {
  padding: 8px 10px;
}

.syntax-group {
  margin-bottom: 8px;
}

.syntax-group-title {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--accent);
  padding: 5px 6px;
  background: rgba(74, 124, 89, 0.1);
  border-radius: 5px;
  cursor: pointer;
  user-select: none;
  transition: background 0.15s;
}

.syntax-group-title:hover {
  background: rgba(74, 124, 89, 0.18);
}

.toggle-icon {
  font-size: 8px;
  transition: transform 0.2s;
  color: var(--text-muted);
}

.syntax-group.collapsed .toggle-icon {
  transform: rotate(-90deg);
}

.syntax-group-body {
  overflow: hidden;
  transition: max-height 0.2s ease, opacity 0.2s;
  max-height: 500px;
  opacity: 1;
}

.syntax-group.collapsed .syntax-group-body {
  max-height: 0;
  opacity: 0;
}

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

.syntax-table th {
  text-align: left;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-muted);
  padding: 4px 6px 3px;
  border-bottom: 1px solid var(--border);
}

.syntax-row {
  cursor: pointer;
  transition: background 0.1s;
}

.syntax-row:hover {
  background: rgba(74, 124, 89, 0.12);
  border-radius: 3px;
}

.syntax-row:active {
  background: rgba(74, 124, 89, 0.2);
}

.syntax-kw,
.syntax-desc {
  padding: 3px 6px;
  vertical-align: middle;
}

.syntax-kw {
  white-space: nowrap;
  color: darkgreen;
  font-weight: bold;
}

.syntax-desc {
  color: var(--text-muted);
}

/* ===========================
  运行时状态指示
=========================== */
.btn-run.running {
  opacity: 0.6;
  cursor: not-allowed;
}