/* ================= 基础重置 ================= */
html,
body,
div,
dl,
dt,
dd,
ul,
ol,
li,
h1,
h2,
h3,
h4,
h5,
h6,
pre,
form,
fieldset,
input,
p,
blockquote,
th,
td {
  margin: 0;
  padding: 0;
}

img,
body,
html {
  border: 0;
}

address,
caption,
cite,
code,
dfn,
em,
strong,
th,
var {
  font-style: normal;
  font-weight: normal;
}

ol,
ul {
  list-style: none;
}

caption,
th {
  text-align: left;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-size: 100%;
}

q:before,
q:after {
  content: '';
}

textarea {
  resize: none;
}

.youfang-unselectable,
.youfang-unselectable * {
  -webkit-user-select: none;
  -moz-user-select: none;
  -khtml-user-select: none;
  user-select: none;
}

table {
  border-spacing: 0;
}

table,
td,
th {
  border-width: 0;
}

/* ================= 主题变量 ================= */
/* 亮色：GitHub Light 基准 */
:root {
  color-scheme: light;

  --font-ui: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --hdr-h: 32px;
  --tb-h: 36px;
  --ctrl-h: 24px;
  --radius: 6px;

  --bg-app: #f6f8fa;
  --bg-canvas: #ffffff;
  --bg-header: #f6f8fa;
  --bg-toolbar: #f6f8fa;
  --bg-input: #ffffff;
  --bg-btn: #f6f8fa;
  --bg-btn-hover: #eaeef2;
  --bg-btn-active: #dfe3e8;
  --bg-elevated: #ffffff;
  --bg-hover: #eaeef2;
  --bg-selected: rgba(9, 105, 218, 0.1);
  --bg-toast: rgba(31, 35, 40, 0.92);
  --text-on-toast: #ffffff;

  --border: #d0d7de;

  --text: #1f2328;
  --text-muted: #656d76;
  --accent: #0969da;
  --focus-ring: rgba(9, 105, 218, 0.3);

  --tree-line: #d0d7de;
  --tree-arrow: #656d76;

  --syn-key: #0550ae;
  --syn-array: #bf3989;
  --syn-string: #116329;
  --syn-number: #953800;
  --syn-boolean: #8250df;
  --syn-null: #6e7781;

  --scroll-thumb: #d0d7de;
  --scroll-thumb-hover: #afb8c1;

  --shadow: 0 8px 24px rgba(140, 149, 159, 0.2);
}

/* 暗色：GitHub Dark 基准 */
html[data-youfang-theme="dark"] {
  color-scheme: dark;

  --bg-app: #010409;
  --bg-canvas: #0d1117;
  --bg-header: #161b22;
  --bg-toolbar: #161b22;
  --bg-input: #0d1117;
  --bg-btn: #21262d;
  --bg-btn-hover: #30363d;
  --bg-btn-active: #282e36;
  --bg-elevated: #161b22;
  --bg-hover: #1c2128;
  --bg-selected: rgba(56, 139, 253, 0.15);
  --bg-toast: rgba(230, 237, 243, 0.92);
  --text-on-toast: #0d1117;

  --border: #30363d;

  --text: #e6edf3;
  --text-muted: #8b949e;
  --accent: #2f81f7;
  --focus-ring: rgba(47, 129, 247, 0.3);

  --tree-line: #30363d;
  --tree-arrow: #8b949e;

  --syn-key: #79c0ff;
  --syn-array: #f778ba;
  --syn-string: #7ee787;
  --syn-number: #ffa657;
  --syn-boolean: #d2a8ff;
  --syn-null: #8b949e;

  --scroll-thumb: #484f58;
  --scroll-thumb-hover: #6e7681;

  --shadow: 0 8px 24px rgba(1, 4, 9, 0.6);
}

/* ================= 表单控件 ================= */
.youfang-form-field {
  margin: 0;
  font: normal 12px var(--font-ui);
}

.youfang-form-text {
  padding: 1px 3px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
}

.youfang-form-text {
  height: var(--ctrl-h);
  line-height: 20px;
  vertical-align: middle;
}

/* ================= 按钮 ================= */
/* 三段精灵图改为扁平平铺：左右两段隐藏，中间段承担整个按钮外观 */
.youfang-btn {
  font: normal 12px var(--font-ui);
  cursor: pointer;
  white-space: nowrap;
}

.youfang-btn button {
  border: 0 none;
  background: transparent;
  color: var(--text);
  font: normal 12px var(--font-ui);
  padding: 0 8px;
  height: calc(var(--ctrl-h) - 2px);
  line-height: calc(var(--ctrl-h) - 2px);
  cursor: pointer;
  margin: 0;
  overflow: visible;
  width: auto;
  -moz-outline: 0 none;
  outline: 0 none;
}

.youfang-btn em {
  font-style: normal;
  font-weight: normal;
}

.youfang-btn-left,
.youfang-btn-right {
  display: none;
}

.youfang-btn-center {
  background: var(--bg-btn);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  vertical-align: middle;
  text-align: center;
  padding: 0;
  height: var(--ctrl-h);
  box-sizing: border-box;
  cursor: pointer;
  white-space: nowrap;
}

.youfang-btn:hover .youfang-btn-center {
  background: var(--bg-btn-hover);
}

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

/* 带图标文本按钮：箭头用 CSS 三角形绘制（原 arrow_up/down.png） */
.youfang-icon-arrow-down::before,
.youfang-icon-arrow-up::before {
  content: "";
  display: inline-block;
  width: 0;
  height: 0;
  margin-right: 6px;
  vertical-align: middle;
  position: relative;
  top: -1px;
}

.youfang-icon-arrow-down::before {
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
}

.youfang-icon-arrow-up::before {
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-bottom: 5px solid currentColor;
}

/* ================= 工具栏 ================= */
/* flex: 0 0 auto —— 固定高度且不参与伸缩，避免树内容撑高时被压缩变矮 */
.youfang-toolbar {
  border: 0 none;
  border-bottom: 1px solid var(--border);
  display: block;
  padding: 0 8px;
  background: var(--bg-toolbar);
  position: relative;
  zoom: 1;
  flex: 0 0 auto;
  height: var(--tb-h);
  box-sizing: border-box;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
}

/* 窄屏时按钮横向可滚动，但不显示滚动条、不改变 36px 高度 */
.youfang-toolbar::-webkit-scrollbar {
  display: none;
}

.youfang-toolbar > table {
  height: 100%;
}

.youfang-toolbar td {
  vertical-align: middle;
}

.youfang-toolbar td,
.youfang-toolbar span,
.youfang-toolbar input,
.youfang-toolbar div,
.youfang-toolbar select,
.youfang-toolbar label {
  white-space: nowrap;
  font: normal 12px var(--font-ui);
}

.youfang-toolbar > table > tbody > tr > td {
  padding-right: 2px;
}

.youfang-toolbar .youfang-tb-text {
  padding: 2px;
  color: var(--text-muted);
}

/* 分隔线：原 grid-blue-split.gif 改为 1px 竖线 */
.youfang-toolbar .youfang-tb-sep {
  display: inline-block;
  width: 1px;
  height: 16px;
  background: var(--border);
  margin: 0 2px;
  padding: 0;
  font-size: 1px;
  overflow: hidden;
  vertical-align: middle;
  cursor: default;
  border: 0;
}

/* ================= 树 ================= */
/* 缩进列：竖线用伪元素绘制（原 elbow*.gif） */
.youfang-tree-node-indent {
  display: inline-block;
  height: 16px;
  line-height: 0;
  font-size: 0;
  vertical-align: top;
}

.youfang-tree-icon {
  display: inline-block;
  width: 16px;
  height: 16px;
  vertical-align: top;
}

.youfang-tree-elbow-line {
  display: inline-block;
  width: 16px;
  height: 16px;
  vertical-align: top;
  position: relative;
}

.youfang-tree-elbow-line::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 0;
  width: 1px;
  height: 16px;
  background: var(--tree-line);
}

/* 伸缩/连接单元格 */
.youfang-tree-icon,
.youfang-tree-ec-icon,
.youfang-tree-elbow,
.youfang-tree-elbow-end,
.youfang-tree-elbow-plus,
.youfang-tree-elbow-minus,
.youfang-tree-elbow-end-plus,
.youfang-tree-elbow-end-minus {
  border: 0 none;
  margin: 0;
  padding: 0;
}

.youfang-tree-ec-icon {
  display: inline-block;
  width: 16px;
  height: 16px;
  vertical-align: top;
  position: relative;
}

/* 竖向连接线：贯穿整格；末位节点只画上半段 */
.youfang-tree-ec-icon::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 0;
  width: 1px;
  height: 16px;
  background: var(--tree-line);
}

.youfang-tree-elbow-end::before,
.youfang-tree-elbow-end-plus::before,
.youfang-tree-elbow-end-minus::before {
  height: 8px;
}

/* 横向连接线：仅叶子节点，从竖线连向类型图标 */
.youfang-tree-elbow::after,
.youfang-tree-elbow-end::after {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  width: 9px;
  height: 1px;
  background: var(--tree-line);
}

/* 容器节点：三角箭头（收起 ▶ / 展开 ▼） */
.youfang-tree-elbow-plus::after,
.youfang-tree-elbow-end-plus::after,
.youfang-tree-elbow-minus::after,
.youfang-tree-elbow-end-minus::after {
  content: "";
  position: absolute;
}

.youfang-tree-elbow-plus::after,
.youfang-tree-elbow-end-plus::after {
  left: 6px;
  top: 4px;
  width: 0;
  height: 0;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  border-left: 5px solid var(--tree-arrow);
}

.youfang-tree-elbow-minus::after,
.youfang-tree-elbow-end-minus::after {
  left: 4px;
  top: 6px;
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid var(--tree-arrow);
}

.youfang-tree-elbow-plus,
.youfang-tree-elbow-minus,
.youfang-tree-elbow-end-plus,
.youfang-tree-elbow-end-minus {
  cursor: pointer;
}

/* 容器节点悬停时箭头高亮：▶ 只改左边框，▼ 只改上边框，避免透明边被填色变成半菱形 */
.youfang-tree-node-el:hover .youfang-tree-elbow-plus::after,
.youfang-tree-node-el:hover .youfang-tree-elbow-end-plus::after {
  border-left-color: var(--text);
}

.youfang-tree-node-el:hover .youfang-tree-elbow-minus::after,
.youfang-tree-node-el:hover .youfang-tree-elbow-end-minus::after {
  border-top-color: var(--text);
}

.youfang-tree-node {
  color: var(--text);
  font: normal 12px var(--font-mono);
  white-space: nowrap;
}

.youfang-tree-node-el {
  line-height: 22px;
  cursor: pointer;
}

.youfang-tree-node a {
  text-decoration: none;
  color: var(--text);
  -webkit-user-select: none;
  -moz-user-select: none;
  -moz-outline: 0 none;
  outline: 0 none;
}

.youfang-tree-node a:hover {
  text-decoration: none;
}

.youfang-tree-node-el:hover {
  background: var(--bg-hover);
}

.youfang-tree-node .youfang-tree-selected {
  background: var(--bg-selected);
}

.youfang-tree-root-ct {
  zoom: 1;
}

/* 类型图标：容器为空心方块，叶子为实心圆点，颜色由语义变量控制 */
.youfang-tree-node-icon {
  display: inline-block;
  width: 16px;
  height: 16px;
  vertical-align: top;
  position: relative;
}

.youfang-tree-node-icon::before {
  content: "";
  position: absolute;
  left: 4.5px;
  top: 4.5px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
}

.youfang-tree-type-object,
.youfang-tree-type-array {
  color: var(--syn-key);
}

.youfang-tree-type-object::before,
.youfang-tree-type-array::before {
  left: 4px;
  top: 4px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: transparent;
  border: 1.5px solid currentColor;
  box-sizing: border-box;
}

.youfang-tree-type-array {
  color: var(--syn-array);
}

.youfang-tree-type-string {
  color: var(--syn-string);
}

.youfang-tree-type-number {
  color: var(--syn-number);
}

.youfang-tree-type-boolean {
  color: var(--syn-boolean);
}

.youfang-tree-type-null {
  color: var(--syn-null);
}

/* 节点标签语法高亮 */
.youfang-tree-key {
  color: var(--syn-key);
}

.youfang-tree-punc {
  color: var(--text-muted);
}

.youfang-tree-val-string {
  color: var(--syn-string);
}

.youfang-tree-val-number {
  color: var(--syn-number);
}

.youfang-tree-val-boolean {
  color: var(--syn-boolean);
}

.youfang-tree-val-null {
  color: var(--syn-null);
}

/* ================= 面板 ================= */
.youfang-panel {
  border-style: solid;
  border-color: var(--border);
  border-width: 1px;
  box-sizing: border-box;
  overflow: hidden;
}

.youfang-panel-header {
  overflow: hidden;
  zoom: 1;
  display: flex;
  align-items: center;
  color: var(--text);
  font: 600 12px var(--font-ui);
  padding: 0 8px;
  height: var(--hdr-h);
  box-sizing: border-box;
  border-bottom: 1px solid var(--border);
  line-height: normal;
  background: var(--bg-header);
}

.youfang-panel-header-text {
  flex: 1 1 auto;
  min-width: 0;
}

.youfang-panel-body {
  border: 0 none;
  overflow: hidden;
  background: var(--bg-canvas);
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
  box-sizing: border-box;
}

.youfang-panel-bwrap {
  overflow: hidden;
  zoom: 1;
  left: 0;
  top: 0;
}

/* ================= 主题切换按钮 ================= */
.youfang-theme-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  padding: 0;
  margin-left: 8px;
  flex: 0 0 auto;
  border: 1px solid transparent;
  border-radius: var(--radius);
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
}

.youfang-theme-btn:hover {
  background: var(--bg-btn-hover);
  border-color: var(--border);
  color: var(--text);
}

.youfang-theme-btn:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--focus-ring);
}

.youfang-theme-icon {
  display: none;
}

.youfang-theme-btn[data-mode="light"] .youfang-theme-icon-light,
.youfang-theme-btn[data-mode="dark"] .youfang-theme-icon-dark,
.youfang-theme-btn[data-mode="system"] .youfang-theme-icon-system {
  display: block;
}

.youfang-theme-icon-light circle {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.3;
}

.youfang-theme-icon-light g {
  stroke: currentColor;
  stroke-width: 1.3;
}

.youfang-theme-icon-dark path {
  fill: currentColor;
  stroke: none;
}

.youfang-theme-icon-system g {
  stroke: currentColor;
}

/* ================= 菜单 ================= */
.youfang-menu {
  border: 1px solid var(--border);
  border-radius: 8px;
  z-index: 15000;
  zoom: 1;
  background: var(--bg-elevated);
  box-shadow: var(--shadow);
  padding: 4px;
}

.youfang-menu a {
  text-decoration: none !important;
}

.youfang-menu-list {
  background: transparent;
  border: 0 none;
}

.youfang-menu li {
  line-height: 100%;
}

.youfang-menu-list-item {
  font: normal 12px var(--font-ui);
  white-space: nowrap;
  -webkit-user-select: none;
  display: block;
  padding: 0;
}

.youfang-menu a.youfang-menu-item {
  display: block;
  line-height: 20px;
  padding: 6px 14px;
  border-radius: var(--radius);
  white-space: nowrap;
  text-decoration: none;
  color: var(--text);
  -moz-outline: 0 none;
  outline: 0 none;
  cursor: pointer;
}

.youfang-menu a.youfang-menu-item:hover {
  background: var(--bg-hover);
}

/* ================= 边框布局 ================= */
.youfang-border-panel {
  position: absolute;
  left: 0;
  top: 0;
}

/* ================= 页面布局 ================= */
html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: var(--bg-app);
}

body {
  font: 12px var(--font-ui);
  color: var(--text);
}

#youfangViewer {
  position: relative;
  width: 100%;
  height: 100%;
}

#youfangTextPanel {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 400px;
}

#youfangViewPanel {
  position: absolute;
  left: 406px;
  top: 0;
  bottom: 0;
  right: 0;
}

/* 分割线：可拖动调整两侧容器宽度 */
#youfangVSplit {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 400px;
  width: 6px;
  cursor: col-resize;
  z-index: 10;
}

#youfangVSplit::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0;
  bottom: 0;
  width: 2px;
  border-radius: 1px;
  background: transparent;
}

#youfangVSplit:hover::before {
  background: var(--accent);
}

#youfangTextPanel .youfang-panel-bwrap,
#youfangViewPanel .youfang-panel-bwrap {
  position: absolute;
  top: var(--hdr-h);
  left: 0;
  right: 0;
  bottom: 0;
  overflow: hidden;
}

#youfangTextPanel .youfang-panel-body,
#youfangViewPanel .youfang-panel-body {
  height: 100%;
  box-sizing: border-box;
  position: relative;
}

/* ================= 左侧文本域 ================= */
/* 底部留 10px，避免末行贴底；超长内容换行，不出现横向滚动条 */
#youfangEdit {
  flex: 1 1 auto;
  min-height: 0;
  width: auto;
  height: auto;
  resize: none;
  margin: 0;
  background: var(--bg-canvas);
  color: var(--text);
  font: 12px/1.6 var(--font-mono);
  border: none;
  outline: none;
  white-space: pre-wrap;
  overflow-x: hidden;
  overflow-y: auto;
  word-break: break-all;
  overflow-wrap: anywhere;
  padding: 8px 10px 10px;
  box-sizing: border-box;
}

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

#youfangSearchTextField {
  font: 12px var(--font-mono);
  height: var(--ctrl-h);
  width: 158px;
  padding: 0 8px;
  box-sizing: border-box;
  background: var(--bg-input);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

#youfangSearchTextField:focus {
  border-color: var(--accent);
  outline: none;
  box-shadow: 0 0 0 2px var(--focus-ring);
}

#youfangSearchResultLabel {
  padding-left: 10px;
  font-weight: 600;
  color: var(--text-muted);
}

/* ================= 树区域 ================= */
/* 底部留出 10px 内边距，避免末行贴底显得看不完整 */
#youfangTreeWrap {
  flex: 1 1 auto;
  min-height: 0;
  overflow: auto;
  background: var(--bg-canvas);
  padding: 6px 0 10px;
}

/* ================= 滚动条 ================= */
/* WebKit/Blink：细、圆角、滑块颜色跟随主题变量 */
#youfangEdit::-webkit-scrollbar,
#youfangTreeWrap::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

#youfangEdit::-webkit-scrollbar-track,
#youfangTreeWrap::-webkit-scrollbar-track {
  background: transparent;
}

#youfangEdit::-webkit-scrollbar-thumb,
#youfangTreeWrap::-webkit-scrollbar-thumb {
  background: var(--scroll-thumb);
  border-radius: 6px;
  border: 2px solid transparent;
  background-clip: content-box;
}

#youfangEdit::-webkit-scrollbar-thumb:hover,
#youfangTreeWrap::-webkit-scrollbar-thumb:hover {
  background: var(--scroll-thumb-hover);
  background-clip: content-box;
}

#youfangEdit::-webkit-scrollbar-corner,
#youfangTreeWrap::-webkit-scrollbar-corner {
  background: transparent;
}

/* Firefox 不支持 ::-webkit-scrollbar，用标准属性兜底 */
@supports not selector(::-webkit-scrollbar) {
  #youfangEdit,
  #youfangTreeWrap {
    scrollbar-width: thin;
    scrollbar-color: var(--scroll-thumb) transparent;
  }
}

/* 复制成功提示 */
.youfang-copy-success {
  position: fixed;
  z-index: 999999;
  top: 50%;
  left: 50%;
  margin-left: -75px;
  width: 200px;
  background-color: var(--bg-toast);
  color: var(--text-on-toast);
  text-align: center;
  display: none;
  padding: 10px 0;
  border-radius: 8px;
  font: 12px var(--font-ui);
  box-shadow: var(--shadow);
}

/* 树节点右键菜单 */
#youfangCtxMenu {
  display: none;
  position: absolute;
  min-width: 130px;
}