/* web/css/app.css —— ugnx12 外观主题：NX 12 风格的蓝灰界面（浅色为主，含深色变量与响应式）。
 *
 * 结构：
 *   1) 设计变量（浅色 / 深色）  2) 基础重置  3) 外壳网格  4) 标题栏
 *   5) 功能区                  6) 资源条 + 导航器 + 上下文菜单
 *   7) 视口（画布 / 三轴 / 启动占位 / 诊断）  8) 状态栏  9) 响应式与无障碍
 *
 * 约定：mm、Z 轴向上；只使用系统字体与本项目自绘 SVG，不引用任何外部字体/图片/CDN。
 */

/* ============================ 1. 设计变量 ============================ */
:root {
  /* 字体：全部来自系统栈，避免任何外部字体请求 */
  --nx-font: "Segoe UI", "Noto Sans SC", "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB",
    system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --nx-font-mono: "Cascadia Mono", "Consolas", "SFMono-Regular", "Noto Sans Mono",
    "DejaVu Sans Mono", monospace;

  /* 尺寸（紧凑排布，贴近 NX 12 的密度） */
  --nx-titlebar-h: 40px;
  --nx-tabstrip-h: 28px;
  --nx-ribbon-h: 92px;
  --nx-status-h: 24px;
  --nx-resbar-w: 40px;
  --nx-navigator-w: 268px;
  --nx-radius: 3px;
  --nx-gap: 6px;

  /* 浅色（蓝灰）主题 */
  --nx-app-bg: #e4e9ee;
  --nx-panel: #f2f5f7;
  --nx-panel-2: #e9eef2;
  --nx-surface: #ffffff;
  --nx-surface-alt: #f7f9fb;
  --nx-text: #1d2733;
  --nx-text-dim: #5b6b7b;
  --nx-text-faint: #8593a1;
  --nx-border: #c6d0d9;
  --nx-border-strong: #a9b6c2;
  --nx-accent: #1a73b8;
  --nx-accent-2: #0f5a94;
  --nx-accent-soft: #dbeaf7;
  --nx-accent-border: #a9cbe6;
  --nx-titlebar: #1d2b3a;
  --nx-titlebar-2: #16222e;
  --nx-titlebar-text: #dfe8f1;
  --nx-titlebar-text-dim: #9fb0c1;
  --nx-titlebar-border: #0d151d;
  --nx-danger: #b3261e;
  --nx-danger-soft: #fbe6e4;
  --nx-warn: #8a5a00;
  --nx-warn-soft: #fdf1d8;
  --nx-success: #1e7b3c;
  --nx-canvas-1: #eef2f6;
  --nx-canvas-2: #c8d3de;
  --nx-canvas-grid: rgba(90, 110, 130, 0.14);
  --nx-shadow-1: 0 1px 2px rgba(20, 35, 50, 0.10);
  --nx-shadow-2: 0 6px 18px rgba(20, 35, 50, 0.18);
  --nx-focus: 0 0 0 2px var(--nx-accent-soft), 0 0 0 3px var(--nx-accent);

  /* 深色调色板（供下方两处映射复用） */
  --nx-d-app-bg: #14181d;
  --nx-d-panel: #1e242b;
  --nx-d-panel-2: #232a32;
  --nx-d-surface: #1a2026;
  --nx-d-surface-alt: #21272e;
  --nx-d-text: #d7e0e9;
  --nx-d-text-dim: #93a3b3;
  --nx-d-text-faint: #6f7f8f;
  --nx-d-border: #333d48;
  --nx-d-border-strong: #46525f;
  --nx-d-accent: #3d9be0;
  --nx-d-accent-2: #8cc6ee;
  --nx-d-accent-soft: #1b3a52;
  --nx-d-accent-border: #2c567a;
  --nx-d-titlebar: #10161c;
  --nx-d-titlebar-2: #0c1116;
  --nx-d-danger: #ef6b62;
  --nx-d-danger-soft: #3a1f1d;
  --nx-d-warn: #d9a53c;
  --nx-d-warn-soft: #372c14;
  --nx-d-success: #5fbf7f;
  --nx-d-canvas-1: #2a323a;
  --nx-d-canvas-2: #161b20;
  --nx-d-canvas-grid: rgba(160, 185, 210, 0.10);
}

/* 深色：显式 data-theme="dark" */
:root[data-theme="dark"] {
  --nx-app-bg: var(--nx-d-app-bg);
  --nx-panel: var(--nx-d-panel);
  --nx-panel-2: var(--nx-d-panel-2);
  --nx-surface: var(--nx-d-surface);
  --nx-surface-alt: var(--nx-d-surface-alt);
  --nx-text: var(--nx-d-text);
  --nx-text-dim: var(--nx-d-text-dim);
  --nx-text-faint: var(--nx-d-text-faint);
  --nx-border: var(--nx-d-border);
  --nx-border-strong: var(--nx-d-border-strong);
  --nx-accent: var(--nx-d-accent);
  --nx-accent-2: var(--nx-d-accent-2);
  --nx-accent-soft: var(--nx-d-accent-soft);
  --nx-accent-border: var(--nx-d-accent-border);
  --nx-titlebar: var(--nx-d-titlebar);
  --nx-titlebar-2: var(--nx-d-titlebar-2);
  --nx-danger: var(--nx-d-danger);
  --nx-danger-soft: var(--nx-d-danger-soft);
  --nx-warn: var(--nx-d-warn);
  --nx-warn-soft: var(--nx-d-warn-soft);
  --nx-success: var(--nx-d-success);
  --nx-canvas-1: var(--nx-d-canvas-1);
  --nx-canvas-2: var(--nx-d-canvas-2);
  --nx-canvas-grid: var(--nx-d-canvas-grid);
  --nx-shadow-1: 0 1px 2px rgba(0, 0, 0, 0.5);
  --nx-shadow-2: 0 8px 24px rgba(0, 0, 0, 0.6);
}

/* 深色：跟随系统（未显式指定 data-theme="light" 时） */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --nx-app-bg: var(--nx-d-app-bg);
    --nx-panel: var(--nx-d-panel);
    --nx-panel-2: var(--nx-d-panel-2);
    --nx-surface: var(--nx-d-surface);
    --nx-surface-alt: var(--nx-d-surface-alt);
    --nx-text: var(--nx-d-text);
    --nx-text-dim: var(--nx-d-text-dim);
    --nx-text-faint: var(--nx-d-text-faint);
    --nx-border: var(--nx-d-border);
    --nx-border-strong: var(--nx-d-border-strong);
    --nx-accent: var(--nx-d-accent);
    --nx-accent-2: var(--nx-d-accent-2);
    --nx-accent-soft: var(--nx-d-accent-soft);
    --nx-accent-border: var(--nx-d-accent-border);
    --nx-titlebar: var(--nx-d-titlebar);
    --nx-titlebar-2: var(--nx-d-titlebar-2);
    --nx-danger: var(--nx-d-danger);
    --nx-danger-soft: var(--nx-d-danger-soft);
    --nx-warn: var(--nx-d-warn);
    --nx-warn-soft: var(--nx-d-warn-soft);
    --nx-success: var(--nx-d-success);
    --nx-canvas-1: var(--nx-d-canvas-1);
    --nx-canvas-2: var(--nx-d-canvas-2);
    --nx-canvas-grid: var(--nx-d-canvas-grid);
    --nx-shadow-1: 0 1px 2px rgba(0, 0, 0, 0.5);
    --nx-shadow-2: 0 8px 24px rgba(0, 0, 0, 0.6);
  }
}

/* ============================ 2. 基础重置 ============================ */
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { height: 100%; }
body {
  margin: 0;
  overflow: hidden;
  font-family: var(--nx-font);
  font-size: 12px;
  line-height: 1.45;
  color: var(--nx-text);
  background: var(--nx-app-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
h1, h2, h3, p, ul, ol { margin: 0; padding: 0; }
ul, ol { list-style: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button { -webkit-tap-highlight-color: transparent; }
code, pre, kbd { font-family: var(--nx-font-mono); }
:focus-visible { outline: 2px solid var(--nx-accent); outline-offset: 1px; }
.nx-icon { display: block; flex: none; overflow: visible; }

/* 细滚动条（NX 风格） */
.nx-ribbonbody, .nx-navigator-body, .nx-finder-results, .nx-diag {
  scrollbar-width: thin;
  scrollbar-color: var(--nx-border-strong) transparent;
}
.nx-ribbonbody::-webkit-scrollbar,
.nx-navigator-body::-webkit-scrollbar,
.nx-finder-results::-webkit-scrollbar,
.nx-diag::-webkit-scrollbar { width: 9px; height: 9px; }
.nx-ribbonbody::-webkit-scrollbar-thumb,
.nx-navigator-body::-webkit-scrollbar-thumb,
.nx-finder-results::-webkit-scrollbar-thumb,
.nx-diag::-webkit-scrollbar-thumb { background: var(--nx-border-strong); border-radius: 5px; }
.nx-ribbonbody::-webkit-scrollbar-track,
.nx-navigator-body::-webkit-scrollbar-track { background: transparent; }

/* ============================ 3. 外壳网格 ============================ */
.nx-shell {
  height: 100vh;
  height: 100dvh;
  display: grid;
  grid-template-rows: var(--nx-titlebar-h) auto minmax(0, 1fr) var(--nx-status-h);
  grid-template-areas: "title" "ribbon" "work" "status";
  background: var(--nx-app-bg);
  color: var(--nx-text);
  overflow: hidden;
}

/* ============================ 4. 标题栏 ============================ */
.nx-titlebar {
  grid-area: title;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 10px;
  background: linear-gradient(180deg, var(--nx-titlebar) 0%, var(--nx-titlebar-2) 100%);
  border-bottom: 1px solid var(--nx-titlebar-border);
  color: var(--nx-titlebar-text);
  box-shadow: var(--nx-shadow-1);
  z-index: 30;
}
.nx-brand {
  display: flex;
  align-items: center;
  gap: 7px;
  padding-right: 10px;
  border-right: 1px solid rgba(255, 255, 255, 0.14);
  user-select: none;
}
.nx-logo { display: block; filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.35)); }
.nx-logo-bg { fill: #1d6fb8; stroke: #2f86d4; stroke-width: 1; }
.nx-logo-glyph { fill: none; stroke: #f2f8ff; stroke-width: 1.9; stroke-linecap: round; stroke-linejoin: round; }
.nx-wordmark { font-size: 14px; font-weight: 600; letter-spacing: 0.02em; color: #eaf3fb; }
.nx-wordmark b { color: #7cc4f5; font-weight: 700; }
.nx-doc { display: flex; flex-direction: column; min-width: 0; max-width: 26ch; }
.nx-doc-name {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--nx-titlebar-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.nx-doc-sub {
  font-size: 10.5px;
  color: var(--nx-titlebar-text-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.nx-finder { position: relative; flex: 1 1 auto; min-width: 140px; max-width: 420px; margin-left: auto; }
.nx-finder-input {
  width: 100%;
  height: 24px;
  padding: 0 8px 0 26px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--nx-radius);
  background: rgba(255, 255, 255, 0.08)
    url("data:image/svg+xml;charset=utf-8,%3Csvg width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%23a9bece' stroke-width='2' stroke-linecap='round'%3E%3Ccircle cx='11' cy='11' r='7'/%3E%3Cpath d='M16.2 16.2L21 21'/%3E%3C/svg%3E")
    no-repeat 7px center;
  color: var(--nx-titlebar-text);
  font-size: 12px;
  outline: none;
}
.nx-finder-input::placeholder { color: #8fa3b5; }
.nx-finder-input:focus {
  background-color: rgba(255, 255, 255, 0.14);
  border-color: var(--nx-accent-2);
  box-shadow: 0 0 0 2px rgba(61, 155, 224, 0.35);
}
.nx-finder-input::-webkit-search-cancel-button { filter: invert(0.8); }
.nx-finder-results {
  position: absolute;
  top: calc(100% + 3px);
  left: 0;
  right: 0;
  max-height: 320px;
  overflow-y: auto;
  padding: 3px;
  background: var(--nx-surface);
  border: 1px solid var(--nx-border-strong);
  border-radius: var(--nx-radius);
  box-shadow: var(--nx-shadow-2);
  color: var(--nx-text);
  z-index: 120;
}
.nx-finder-item {
  display: flex;
  align-items: center;
  gap: 7px;
  width: 100%;
  padding: 4px 7px;
  border: 0;
  border-radius: 2px;
  background: transparent;
  text-align: left;
  cursor: pointer;
  font-size: 12px;
}
.nx-finder-item:hover, .nx-finder-item.is-active { background: var(--nx-accent-soft); }
.nx-finder-item.is-unsupported { opacity: 0.65; }
.nx-finder-ico { display: flex; color: var(--nx-accent-2); }
.nx-finder-label { font-weight: 600; white-space: nowrap; }
.nx-finder-meta { color: var(--nx-text-dim); font-size: 11px; margin-left: auto; white-space: nowrap; }
.nx-finder-badge {
  padding: 0 5px;
  border: 1px solid var(--nx-border);
  border-radius: 8px;
  font-size: 10px;
  color: var(--nx-warn);
  background: var(--nx-warn-soft);
}
.nx-badges { display: flex; align-items: center; gap: 6px; margin-left: auto; padding-left: 6px; }
.nx-badge {
  display: inline-flex;
  align-items: center;
  height: 18px;
  padding: 0 7px;
  border-radius: 9px;
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.05em;
  border: 1px solid transparent;
  white-space: nowrap;
}
.nx-badge--dev { background: #b8791b; border-color: #d99a3a; color: #fff8ec; }
.nx-badge--prod { background: #1e7b3c; border-color: #35a05a; color: #f2fff6; }
.nx-badge--ghost { background: transparent; border-color: rgba(255, 255, 255, 0.22); color: var(--nx-titlebar-text-dim); font-weight: 600; }

/* ============================ 5. 功能区 ============================ */
.nx-ribbon {
  grid-area: ribbon;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--nx-panel);
  border-bottom: 2px solid var(--nx-accent);
  z-index: 20;
}
.nx-tabstrip {
  display: flex;
  align-items: flex-end;
  gap: 1px;
  height: var(--nx-tabstrip-h);
  padding: 0 6px;
  background: var(--nx-panel-2);
  border-bottom: 1px solid var(--nx-border);
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
}
.nx-tabstrip::-webkit-scrollbar { height: 0; }
.nx-tab {
  position: relative;
  height: 26px;
  padding: 0 13px;
  border: 1px solid transparent;
  border-bottom: 0;
  border-radius: var(--nx-radius) var(--nx-radius) 0 0;
  background: transparent;
  color: var(--nx-text-dim);
  font-size: 12px;
  white-space: nowrap;
  cursor: pointer;
  flex: 0 0 auto;
}
.nx-tab:hover { color: var(--nx-text); background: var(--nx-accent-soft); }
.nx-tab.is-active {
  color: var(--nx-accent-2);
  background: var(--nx-surface);
  border-color: var(--nx-border);
  border-bottom-color: var(--nx-surface);
  font-weight: 600;
  box-shadow: inset 0 2px 0 var(--nx-accent);
}
.nx-tab.is-active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--nx-surface);
}
.nx-ribbonbody {
  display: flex;
  align-items: stretch;
  min-height: var(--nx-ribbon-h);
  max-height: var(--nx-ribbon-h);
  overflow-x: auto;
  overflow-y: hidden;
  background: var(--nx-surface);
  padding: 0;
}
.nx-ribbonbody:focus-visible { outline-offset: -2px; }
.rg {
  display: flex;
  flex-direction: column;
  flex: 0 0 auto;
  padding: 3px 4px 0;
  border-right: 1px solid var(--nx-border);
  min-width: 0;
}
.rg:last-child { border-right: 0; }
.rg-items { display: flex; align-items: stretch; gap: 3px; flex: 1 1 auto; }
.rg-large { display: flex; gap: 2px; align-items: stretch; }
.rg-small {
  display: grid;
  grid-auto-flow: column;
  grid-template-rows: repeat(3, 23px);
  gap: 1px;
  align-content: center;
}
.rg-btn {
  border: 1px solid transparent;
  border-radius: var(--nx-radius);
  background: transparent;
  color: var(--nx-text);
  cursor: pointer;
  padding: 0;
  font-size: 11px;
  position: relative;
}
.rg-btn:hover { background: var(--nx-accent-soft); border-color: var(--nx-accent-border); }
.rg-btn:active { background: var(--nx-accent-border); }
.rg-btn:focus-visible { outline: 2px solid var(--nx-accent); outline-offset: 0; }
.rg-btn[aria-pressed="true"] {
  background: var(--nx-accent-soft);
  border-color: var(--nx-accent);
  box-shadow: inset 0 0 0 1px var(--nx-accent-border);
}
.rg-btn[aria-pressed="true"] .rg-ico { color: var(--nx-accent-2); }
.rg-btn--large {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  gap: 3px;
  width: 60px;
  padding: 5px 2px 3px;
  height: 100%;
}
.rg-btn--small {
  display: flex;
  align-items: center;
  gap: 5px;
  height: 22px;
  padding: 0 5px;
  width: max-content;
  max-width: 132px;
}
.rg-ico { display: flex; align-items: center; justify-content: center; color: var(--nx-accent-2); }
.rg-label {
  line-height: 1.15;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}
.rg-btn--large .rg-label { white-space: normal; text-align: center; font-size: 11px; max-width: 58px; }
.rg-btn--unsupported { opacity: 0.5; cursor: not-allowed; }
.rg-btn--unsupported:hover { background: transparent; border-color: transparent; }
.rg-badge {
  position: absolute;
  right: 1px;
  bottom: 1px;
  padding: 0 3px;
  border-radius: 6px;
  background: var(--nx-warn-soft);
  border: 1px solid var(--nx-border);
  color: var(--nx-warn);
  font-size: 9px;
  line-height: 12px;
}
.rg-btn--large .rg-badge { right: 2px; bottom: 2px; }
.rg-title {
  flex: none;
  margin-top: 2px;
  padding: 1px 2px 2px;
  border-top: 1px solid var(--nx-border);
  color: var(--nx-text-dim);
  font-size: 10.5px;
  text-align: center;
  white-space: nowrap;
  letter-spacing: 0.02em;
}
.nx-ribbon-note {
  padding: 3px 10px;
  background: var(--nx-warn-soft);
  border-top: 1px solid var(--nx-border);
  color: var(--nx-warn);
  font-size: 11px;
  line-height: 1.5;
}

/* ============================ 6. 工作区 / 资源条 / 导航器 ============================ */
.nx-workspace {
  grid-area: work;
  display: grid;
  grid-template-columns: var(--nx-resbar-w) var(--nx-navigator-w) minmax(0, 1fr);
  min-height: 0;
  min-width: 0;
  background: var(--nx-app-bg);
  position: relative; /* 窄屏时导航器作为抽屉相对工作区定位 */
  overflow: hidden;
}
.nx-resbar {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 6px 0;
  background: var(--nx-panel-2);
  border-right: 1px solid var(--nx-border);
  overflow-y: auto;
  scrollbar-width: none;
}
.nx-resbar::-webkit-scrollbar { width: 0; }
.nx-resbtn {
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid transparent;
  border-radius: var(--nx-radius);
  background: transparent;
  color: var(--nx-text-dim);
  cursor: pointer;
  flex: none;
}
.nx-resbtn:hover { background: var(--nx-accent-soft); color: var(--nx-accent-2); }
.nx-resbtn.is-active {
  background: var(--nx-surface);
  border-color: var(--nx-accent-border);
  color: var(--nx-accent-2);
  box-shadow: inset 2px 0 0 var(--nx-accent);
}
.nx-resbtn-ico { display: block; }

.nx-navigator {
  display: flex;
  flex-direction: column;
  min-height: 0;
  min-width: 0;
  background: var(--nx-panel);
  border-right: 1px solid var(--nx-border-strong);
  position: relative;
  z-index: 15;
}
.nx-navigator-head {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 26px;
  padding: 0 8px;
  background: linear-gradient(180deg, var(--nx-panel) 0%, var(--nx-panel-2) 100%);
  border-bottom: 1px solid var(--nx-border);
}
.nx-navigator-title {
  font-size: 11.5px;
  font-weight: 700;
  color: var(--nx-text);
  letter-spacing: 0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.nx-navigator-count {
  margin-left: auto;
  min-width: 18px;
  padding: 0 5px;
  border-radius: 8px;
  background: var(--nx-panel-2);
  border: 1px solid var(--nx-border);
  color: var(--nx-text-dim);
  font-size: 10px;
  text-align: center;
}
.nx-navigator-body {
  flex: 1 1 auto;
  min-height: 0;
  overflow: auto;
  padding: 2px 0 8px;
  outline: none;
}
.nx-navigator-foot {
  flex: none;
  border-top: 1px solid var(--nx-border);
  background: var(--nx-surface-alt);
  padding: 5px 6px;
}
.nav-cols {
  display: flex;
  justify-content: space-between;
  padding: 2px 8px;
  color: var(--nx-text-faint);
  font-size: 10px;
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--nx-border);
  margin-bottom: 2px;
  text-transform: uppercase;
}
.nav-row {
  display: flex;
  align-items: center;
  gap: 5px;
  height: 21px;
  padding: 0 8px 0 6px;
  cursor: default;
  color: var(--nx-text);
  border: 1px solid transparent;
  white-space: nowrap;
}
.nav-row:hover { background: var(--nx-accent-soft); }
.nav-row.is-selected {
  background: var(--nx-accent-soft);
  border-color: var(--nx-accent-border);
  box-shadow: inset 2px 0 0 var(--nx-accent);
}
.nav-row.is-suppressed .nav-label { color: var(--nx-text-faint); font-style: italic; text-decoration: line-through; }
.nav-row.is-error .nav-label { color: var(--nx-danger); }
.nav-row.is-error .nav-ico { color: var(--nx-danger); }
.nav-row--muted { color: var(--nx-text-dim); }
.nav-row--view { padding-left: 18px; }
.nav-ico { display: flex; color: var(--nx-accent-2); flex: none; }
.nav-label { flex: 1 1 auto; overflow: hidden; text-overflow: ellipsis; font-size: 11.5px; }
.nav-marks { display: flex; gap: 4px; align-items: center; flex: none; }
.nav-mark {
  padding: 0 4px;
  border-radius: 7px;
  font-size: 9.5px;
  line-height: 14px;
  border: 1px solid var(--nx-border);
  background: var(--nx-panel-2);
  color: var(--nx-text-dim);
}
.nav-mark--error {
  background: var(--nx-danger-soft);
  border-color: var(--nx-danger);
  color: var(--nx-danger);
  font-weight: 700;
}
.nav-group {
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 4px 0 1px;
  padding: 2px 8px;
  background: var(--nx-panel-2);
  border-top: 1px solid var(--nx-border);
  border-bottom: 1px solid var(--nx-border);
  color: var(--nx-text-dim);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.03em;
}
.nav-group-count { margin-left: auto; color: var(--nx-text-faint); font-weight: 400; }
.nav-empty {
  margin: 14px 12px;
  padding: 10px 12px;
  border: 1px dashed var(--nx-border-strong);
  border-radius: var(--nx-radius);
  color: var(--nx-text-dim);
  font-size: 11.5px;
  line-height: 1.7;
  background: var(--nx-surface-alt);
}
.nav-rename {
  width: 100%;
  height: 17px;
  padding: 0 4px;
  border: 1px solid var(--nx-accent);
  border-radius: 2px;
  background: var(--nx-surface);
  color: var(--nx-text);
  font-size: 11.5px;
  outline: none;
}
.nav-confirm { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.nav-confirm-text { flex: 1 1 100%; font-size: 11px; color: var(--nx-text); }
.nav-confirm-btn {
  height: 21px;
  padding: 0 10px;
  border: 1px solid var(--nx-border-strong);
  border-radius: var(--nx-radius);
  background: var(--nx-surface);
  color: var(--nx-text);
  font-size: 11px;
  cursor: pointer;
}
.nav-confirm-btn:hover { background: var(--nx-accent-soft); }
.nav-confirm-btn--danger { border-color: var(--nx-danger); color: var(--nx-danger); background: var(--nx-danger-soft); }
.nav-confirm-btn--danger:hover { background: var(--nx-danger); color: #fff; }

/* 右键菜单 */
.nx-menu {
  position: fixed;
  z-index: 400;
  min-width: 168px;
  padding: 3px;
  background: var(--nx-surface);
  border: 1px solid var(--nx-border-strong);
  border-radius: var(--nx-radius);
  box-shadow: var(--nx-shadow-2);
  color: var(--nx-text);
}
.nx-menu-item {
  display: flex;
  align-items: center;
  gap: 7px;
  width: 100%;
  height: 23px;
  padding: 0 8px;
  border: 0;
  border-radius: 2px;
  background: transparent;
  color: var(--nx-text);
  font-size: 11.5px;
  text-align: left;
  cursor: pointer;
}
.nx-menu-item:hover:not([disabled]) { background: var(--nx-accent-soft); }
.nx-menu-item[disabled] { color: var(--nx-text-faint); cursor: default; }
.nx-menu-item--danger { color: var(--nx-danger); }
.nx-menu-item--danger:hover:not([disabled]) { background: var(--nx-danger-soft); }
.nx-menu-ico { display: flex; color: var(--nx-text-dim); width: 14px; }
.nx-menu-item--danger .nx-menu-ico { color: var(--nx-danger); }
.nx-menu-sep { height: 1px; margin: 3px 4px; background: var(--nx-border); }

/* ============================ 7. 视口 ============================ */
.nx-viewport {
  position: relative;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background:
    radial-gradient(120% 90% at 50% 0%, rgba(255, 255, 255, 0.5), rgba(255, 255, 255, 0) 60%),
    repeating-linear-gradient(45deg, var(--nx-canvas-grid) 0 1px, transparent 1px 40px),
    repeating-linear-gradient(-45deg, var(--nx-canvas-grid) 0 1px, transparent 1px 40px),
    linear-gradient(180deg, var(--nx-canvas-1) 0%, var(--nx-canvas-2) 100%);
}
.nx-canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
.nx-canvas--gl { z-index: 1; }
.nx-canvas--overlay { z-index: 2; pointer-events: none; }
.nx-viewaxis {
  position: absolute;
  left: 10px;
  bottom: 10px;
  z-index: 4;
  pointer-events: none;
  opacity: 0.9;
  filter: drop-shadow(0 1px 1px rgba(0, 0, 0, 0.25));
}
.nx-axis-svg { display: block; }
.axis-x { stroke: #c0392b; stroke-width: 2; fill: none; }
.axis-x-head { fill: #c0392b; }
.axis-y { stroke: #1e8449; stroke-width: 2; fill: none; }
.axis-y-head { fill: #1e8449; }
.axis-z { stroke: #1f5fa8; stroke-width: 2; fill: none; }
.axis-z-head { fill: #1f5fa8; }
.axis-origin { fill: #2c3e50; }
.axis-label { font-family: var(--nx-font); font-size: 10px; font-weight: 700; }
.axis-label--x { fill: #c0392b; }
.axis-label--y { fill: #1e8449; }
.axis-label--z { fill: #1f5fa8; }

/* 启动占位卡（应用未注册时显示，注册后 hidden） */
.nx-boot {
  position: absolute;
  inset: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px;
  pointer-events: none;
}
.nx-boot-card {
  pointer-events: auto;
  max-width: 560px;
  padding: 16px 20px 18px;
  border: 1px solid var(--nx-border-strong);
  border-top: 3px solid var(--nx-accent);
  border-radius: var(--nx-radius);
  background: color-mix(in srgb, var(--nx-surface) 92%, transparent);
  box-shadow: var(--nx-shadow-2);
  color: var(--nx-text);
}
@supports not (background: color-mix(in srgb, white 50%, transparent)) {
  .nx-boot-card { background: var(--nx-surface); }
}
.nx-boot-title { font-size: 14px; font-weight: 700; color: var(--nx-accent-2); letter-spacing: 0.02em; }
.nx-boot-state { margin-top: 4px; font-size: 12px; color: var(--nx-text); }
.nx-boot-list { margin-top: 8px; padding-left: 0; }
.nx-boot-list li {
  position: relative;
  padding-left: 14px;
  margin-top: 4px;
  font-size: 11.5px;
  line-height: 1.65;
  color: var(--nx-text-dim);
}
.nx-boot-list li::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 7px;
  width: 5px;
  height: 5px;
  border-radius: 1px;
  background: var(--nx-accent);
  transform: rotate(45deg);
}
.nx-boot-list b { color: var(--nx-text); }
.nx-boot-hint {
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px dashed var(--nx-border);
  font-size: 11px;
  line-height: 1.7;
  color: var(--nx-text-faint);
}
.nx-boot-hint code {
  padding: 0 3px;
  border: 1px solid var(--nx-border);
  border-radius: 2px;
  background: var(--nx-surface-alt);
  color: var(--nx-accent-2);
  font-size: 10.5px;
  white-space: nowrap;
}

/* 诊断面板（#js-errors / #selftest-output，由 main.js 或外壳错误收集器写入） */
.nx-diag {
  position: absolute;
  left: 10px;
  bottom: 78px;
  z-index: 6;
  max-width: min(560px, calc(100% - 20px));
  max-height: 150px;
  overflow: auto;
  margin: 0;
  padding: 6px 9px;
  border: 1px solid var(--nx-border-strong);
  border-left: 3px solid var(--nx-danger);
  border-radius: var(--nx-radius);
  background: color-mix(in srgb, var(--nx-surface) 94%, transparent);
  color: var(--nx-text);
  font-family: var(--nx-font-mono);
  font-size: 10.5px;
  line-height: 1.6;
  box-shadow: var(--nx-shadow-2);
  white-space: pre-wrap;
  word-break: break-word;
}
@supports not (background: color-mix(in srgb, white 50%, transparent)) {
  .nx-diag { background: var(--nx-surface); }
}
.nx-diag--selftest { border-left-color: var(--nx-success); left: auto; right: 10px; bottom: 78px; }
.nx-diag--errors li { list-style: none; }
.nx-diag--errors li + li { margin-top: 2px; padding-top: 2px; border-top: 1px dotted var(--nx-border); }

/* ============================ 8. 状态栏 ============================ */
.nx-statusbar {
  grid-area: status;
  display: flex;
  align-items: center;
  gap: 8px;
  height: var(--nx-status-h);
  padding: 0 8px;
  background: var(--nx-panel-2);
  border-top: 1px solid var(--nx-border-strong);
  color: var(--nx-text-dim);
  font-size: 11px;
  overflow: hidden;
  white-space: nowrap;
  z-index: 25;
}
.nx-status-message {
  color: var(--nx-text);
  font-weight: 600;
  max-width: 34ch;
  overflow: hidden;
  text-overflow: ellipsis;
}
.nx-status-message[data-level="warn"] { color: var(--nx-warn); }
.nx-status-message[data-level="error"] { color: var(--nx-danger); }
.nx-status-message[data-level="busy"] { color: var(--nx-accent-2); }
.nx-status-prompt {
  color: var(--nx-text-faint);
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 46ch;
}
.nx-status-spacer { flex: 1 1 auto; }
.nx-status-item {
  flex: none;
  padding: 0 7px;
  border-left: 1px solid var(--nx-border);
  color: var(--nx-text-dim);
}
.nx-status-coords { display: inline-flex; align-items: center; gap: 3px; }
.nx-status-coords b {
  color: var(--nx-text-faint);
  font-weight: 700;
  font-size: 10px;
}
.nx-status-coords i {
  display: inline-block;
  min-width: 5.4em;
  font-style: normal;
  font-family: var(--nx-font-mono);
  color: var(--nx-text);
  text-align: right;
}
.nx-status-coords b + i { margin-right: 3px; }
.nx-statusbar.is-dirty .nx-status-message::after { content: " *"; color: var(--nx-warn); }

/* ============================ 9. 响应式与无障碍 ============================ */
@media (max-width: 1240px) {
  :root { --nx-navigator-w: 236px; }
  .rg-btn--large { width: 54px; }
}
@media (max-width: 1040px) {
  :root { --nx-navigator-w: 208px; --nx-ribbon-h: 88px; }
  .nx-doc { max-width: 18ch; }
  .nx-status-prompt { display: none; }
}
@media (max-width: 900px) {
  .nx-shell { grid-template-rows: var(--nx-titlebar-h) auto minmax(0, 1fr) var(--nx-status-h); }
  .nx-workspace { grid-template-columns: var(--nx-resbar-w) minmax(0, 1fr); }
  .nx-navigator {
    position: absolute;
    left: var(--nx-resbar-w);
    top: 0;
    bottom: 0;
    width: 248px;
    border-right: 1px solid var(--nx-border-strong);
    box-shadow: var(--nx-shadow-2);
    transform: translateX(-105%);
    transition: transform 140ms ease;
    will-change: transform;
  }
  .nx-shell[data-nav-open="yes"] .nx-navigator { transform: translateX(0); }
  .nx-resbar { grid-column: 1; }
  .nx-viewport { grid-column: 2; }
  .nx-badges .nx-badge--ghost { display: none; }
  .nx-status-coords i { min-width: 4.4em; }
}
@media (max-width: 720px) {
  .nx-finder { max-width: none; }
  .nx-doc { display: none; }
  .rg-btn--small { max-width: 108px; }
  .nx-boot-card { max-width: 100%; padding: 12px 14px; }
  .nx-status-item { padding: 0 5px; }
  #status-mode { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}
@media (forced-colors: active) {
  .nx-shell, .nx-ribbon, .nx-navigator, .nx-statusbar { border-color: CanvasText; }
  .rg-btn, .nx-tab, .nav-row, .nx-resbtn { border-color: transparent; }
}