/* ===================================================================
   help.css — MOD 制作教程 共享样式（重设计版）
   风格：CHM 帮助文件骨架 + 「军械库暗色」主题（钢铁洪流军事风）
   可切换「经典 CHM 亮色」主题（CSS 变量）
   适配：手机版（≤900px 树目录收起为抽屉 + 内容全宽）
   =================================================================== */

/* ---------- 主题变量 ---------- */
:root {
  /* 军械库暗色（默认） */
  --bg0: #0c0e10;
  --bg1: #14171b;
  --bg2: #1b1f25;
  --bg3: #232830;
  --fg: #d7dde3;
  --fg-dim: #8b97a5;
  --fg-bright: #ffffff;
  --accent: #e8c14a;        /* 军械黄 */
  --accent2: #ff7a45;       /* 信号橙红 */
  --accent3: #4aa8ff;       /* 档案蓝 */
  --purple: #b79aff;        /* 参数紫（贴近 CHM 链接紫） */
  --code-bg: #0a0c0f;
  --code-border: #2c333c;
  --panel: #161a1f;
  --panel-border: #2a313a;
  --shadow: 0 6px 24px rgba(0,0,0,0.5);
  --grad-top: linear-gradient(180deg, #1c2129, #12151a);
  --grad-btn: linear-gradient(180deg, #2a3038, #1a1e24);
  --sel-bg: #3a4a3a;
  --sel-fg: #e8c14a;
  --mark: #5a4a1a;
  --hover: #1f2530;
}

body.theme-chm {
  /* 经典 CHM 亮色 */
  --bg0: #f0f0f0;
  --bg1: #f8f8f8;
  --bg2: #ffffff;
  --bg3: #ececec;
  --fg: #1a1a1a;
  --fg-dim: #666;
  --fg-bright: #000;
  --accent: #0078d7;
  --accent2: #d03020;
  --accent3: #2a7ab8;
  --purple: #6a3fa5;
  --code-bg: #f6f6f6;
  --code-border: #d8d8d8;
  --panel: #fff;
  --panel-border: #c8c8c8;
  --shadow: 0 3px 10px rgba(0,0,0,0.2);
  --grad-top: linear-gradient(180deg, #f8f8f8, #e4e4e4);
  --grad-btn: linear-gradient(180deg, #efefef, #ddd);
  --sel-bg: #0078d7;
  --sel-fg: #fff;
  --mark: #fff59a;
  --hover: #e8f0fa;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }

body {
  font-family: "Microsoft YaHei", "Segoe UI", SimSun, sans-serif;
  font-size: 14px;
  line-height: 1.75;
  color: var(--fg);
  background: var(--bg0);
  overflow: hidden;
  transition: background 0.3s, color 0.3s;
}

/* ================= 整体布局 ================= */
#help { display: flex; flex-direction: column; height: 100vh; height: 100dvh; width: 100%; }

/* ---------- 顶部工具栏 ---------- */
#toolbar {
  flex: none;
  display: flex;
  align-items: center;
  gap: 2px;
  height: 42px;
  padding: 0 6px;
  background: var(--grad-top);
  border-bottom: 1px solid var(--panel-border);
  box-shadow: 0 1px 0 rgba(255,255,255,0.06) inset, 0 2px 10px rgba(0,0,0,0.3);
  user-select: none;
  position: relative;
  z-index: 60;
}
#toolbar::after {
  content: '';
  position: absolute; left: 0; right: 0; bottom: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.35;
}
#toolbar .tb-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--fg-bright);
  margin-right: 10px;
  letter-spacing: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
#toolbar .tb-title b { color: var(--accent); }
#toolbar .tb-sep { width: 1px; height: 20px; background: var(--panel-border); margin: 0 4px; flex-shrink: 0; }
.tb-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 9px;
  font-size: 12px;
  color: var(--fg);
  background: var(--grad-btn);
  border: 1px solid var(--panel-border);
  border-radius: 3px;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  transition: filter 0.15s, transform 0.08s, border-color 0.15s;
}
.tb-btn:hover { filter: brightness(1.2); border-color: var(--accent); }
.tb-btn:active { transform: translateY(1px); }
.tb-btn.on { background: var(--sel-bg); color: var(--sel-fg); border-color: var(--accent); }
.tb-hide-mobile { display: none; }
.tb-theme { color: var(--accent); }
#tb-theme-btn { font-size: 11px; }

/* 进度条（内容滚动） */
#progress-wrap {
  position: absolute; left: 0; right: 0; bottom: 0; height: 2px;
  background: transparent; z-index: 5;
}
#progress-bar {
  height: 100%; width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  transition: width 0.1s linear;
}

/* ---------- 主区 ---------- */
#main { flex: 1; display: flex; min-height: 0; }

/* ================= 左侧导航 ================= */
#nav {
  flex: none; width: 268px;
  min-width: 0;
  overflow: hidden;
  display: flex; flex-direction: column;
  background: var(--bg2);
  border-right: 1px solid var(--panel-border);
  /* 桌面端：目录可滑出/收起（☰ 切换） */
  transition: width 0.26s cubic-bezier(0.25, 0.8, 0.3, 1), border-color 0.26s;
}
#nav.collapsed {
  width: 0;
  border-right-color: transparent;
  overflow: hidden;
}
#nav-tabs { flex: none; display: flex; border-bottom: 1px solid var(--panel-border); background: var(--bg3); }
#nav-tabs .nt {
  flex: 1; padding: 8px 0; font-size: 12px; text-align: center;
  color: var(--fg-dim); cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: background 0.15s, color 0.15s;
}
#nav-tabs .nt:hover { background: var(--hover); color: var(--fg); }
#nav-tabs .nt.on { background: var(--bg2); border-bottom-color: var(--accent); color: var(--accent); font-weight: 700; }
#nav-body { flex: 1; min-height: 0; overflow: hidden; position: relative; }
#nav-pane { position: absolute; inset: 0; display: none; overflow-y: auto; }
#nav-pane.on { display: block; }

/* 树工具条（全部展开/折叠） */
.tree-tools {
  display: flex; gap: 4px; padding: 6px 8px;
  border-bottom: 1px solid var(--panel-border);
  background: var(--bg2);
}
.tree-tools button {
  flex: 1; padding: 3px 4px; font-size: 11px; cursor: pointer;
  background: var(--grad-btn); color: var(--fg-dim);
  border: 1px solid var(--panel-border); border-radius: 2px;
}
.tree-tools button:hover { color: var(--accent); border-color: var(--accent); }

/* 树形结构 */
.help-tree ul { list-style: none; padding-left: 14px; }
.help-tree > ul { padding-left: 0; }
.help-tree li { line-height: 1.5; }
.help-tree .t-node {
  display: flex; align-items: center; gap: 5px;
  padding: 4px 10px; font-size: 13px;
  color: var(--fg); cursor: pointer; text-decoration: none;
  border-left: 2px solid transparent;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
  animation: nodeIn 0.25s ease backwards;
}
@keyframes nodeIn { from { opacity: 0; transform: translateX(-6px); } to { opacity: 1; transform: none; } }
.help-tree .t-node:hover { background: var(--hover); color: var(--fg-bright); }
.help-tree .t-node.sel { background: var(--sel-bg); color: var(--sel-fg); border-left-color: var(--accent); }
.help-tree .t-node .t-ico { font-size: 11px; width: 14px; text-align: center; flex-shrink: 0; color: var(--fg-dim); }
.help-tree .t-node.sel .t-ico { color: var(--sel-fg); }
.help-tree .t-node .t-lbl { flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.help-tree ul.collapsed { display: none; }
.help-tree .t-grp { font-weight: 700; color: var(--fg-bright); }

/* 索引面板 */
.idx-char {
  padding: 8px 12px 3px;
  font-size: 13px; font-weight: 700; color: var(--accent);
  letter-spacing: 2px;
  border-bottom: 1px solid var(--panel-border);
}
.idx-row {
  padding: 5px 12px; font-size: 13px;
  color: var(--fg); cursor: pointer;
  border-bottom: 1px solid var(--panel-border);
  display: flex; align-items: center; gap: 8px;
  transition: background 0.12s;
}
.idx-row:hover { background: var(--hover); color: var(--fg-bright); }
.idx-row .idx-tag {
  display: inline-block; font-size: 11px; flex-shrink: 0;
  color: var(--purple);
  border: 1px solid color-mix(in srgb, var(--purple) 45%, transparent);
  border-radius: 2px; padding: 0 4px;
  background: color-mix(in srgb, var(--purple) 10%, transparent);
}

/* 搜索面板 */
#nav-search { padding: 8px; border-bottom: 1px solid var(--panel-border); display: flex; gap: 4px; }
#nav-search input {
  flex: 1; padding: 7px 10px; font-size: 13px;
  color: var(--fg); background: var(--bg1);
  border: 1px solid var(--panel-border); border-radius: 3px; outline: none;
  transition: border-color 0.15s;
}
#nav-search input:focus { border-color: var(--accent); }
#search-res { padding: 4px 0; }
.search-item {
  padding: 7px 12px; font-size: 13px;
  color: var(--fg); cursor: pointer;
  border-bottom: 1px solid var(--panel-border);
  transition: background 0.12s;
}
.search-item:hover { background: var(--hover); color: var(--fg-bright); }
.search-item .si-title { font-weight: 700; color: var(--fg-bright); }
.search-item .si-preview { font-size: 12px; color: var(--fg-dim); margin-top: 1px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
mark { background: var(--mark); color: var(--fg-bright); padding: 0 2px; border-radius: 2px; }

/* ================= 右侧内容 ================= */
#content {
  flex: 1; min-width: 0;
  background: var(--bg2);
  overflow-y: auto;
  padding: 22px 32px 50px;
  scroll-behavior: smooth;
}
#content h1 {
  font-size: 23px;
  color: var(--fg-bright);
  border-bottom: 2px solid var(--accent);
  padding-bottom: 10px; margin-bottom: 18px;
  letter-spacing: 2px;
  position: relative;
}
#content h1::after {
  content: ''; position: absolute; left: 0; bottom: -2px; width: 56px; height: 2px;
  background: var(--accent2);
}
#content h2 {
  font-size: 18px; color: var(--accent);
  margin: 26px 0 10px; padding-bottom: 5px;
  border-bottom: 1px solid var(--panel-border);
}
#content h3 { font-size: 15px; color: var(--fg-bright); margin: 18px 0 8px; }
#content p { margin: 8px 0; color: var(--fg); }
#content ul, #content ol { margin: 8px 0 8px 24px; }
#content li { margin: 4px 0; }
#content strong { color: var(--fg-bright); }
#content em { color: var(--fg-dim); }
#content a { color: var(--accent3); text-decoration: none; border-bottom: 1px dotted var(--accent3); }
#content a:hover { border-bottom-color: var(--accent2); color: var(--accent2); }

/* 代码 */
#content pre {
  position: relative;
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-left: 3px solid var(--accent);
  padding: 12px 14px 12px 46px;
  margin: 10px 0;
  font-size: 12.5px; line-height: 1.6;
  overflow-x: auto;
  font-family: Consolas, "Courier New", monospace;
  white-space: pre;
  border-radius: 3px;
  box-shadow: var(--shadow);
}
#content pre::before {
  content: attr(data-ln);
  position: absolute; left: 0; top: 0; bottom: 0; width: 36px;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  border-right: 1px solid var(--code-border);
  color: var(--fg-dim);
  font-size: 11px;
  text-align: right;
  padding: 12px 6px 12px 0;
  line-height: 1.6;
  white-space: pre-wrap;
  overflow: hidden;
  pointer-events: none;
}
#content pre .copy-btn {
  position: absolute; top: 4px; right: 4px;
  padding: 2px 8px; font-size: 11px; cursor: pointer;
  background: var(--grad-btn); color: var(--fg-dim);
  border: 1px solid var(--code-border); border-radius: 2px;
  opacity: 0; transition: opacity 0.15s;
}
#content pre:hover .copy-btn { opacity: 1; }
#content pre .copy-btn:hover { color: var(--accent); border-color: var(--accent); }
#content code {
  font-family: Consolas, "Courier New", monospace;
  font-size: 13px;
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  border-radius: 3px;
  padding: 0 5px;
  color: var(--accent2);
}
#content pre code { background: none; border: none; padding: 0; color: var(--fg); }

/* CHM 风格参数行（档案卡样式） */
#content .param {
  display: block;
  margin: 10px 0 2px;
  padding: 8px 14px;
  background: color-mix(in srgb, var(--purple) 8%, var(--bg2));
  border: 1px solid color-mix(in srgb, var(--purple) 28%, transparent);
  border-left: 3px solid var(--purple);
  border-radius: 3px;
  font-family: Consolas, "Courier New", monospace;
  font-size: 13px;
  color: var(--purple);
  word-break: break-all;
}
#content .param b { color: var(--fg-bright); font-weight: 700; }
#content .param-desc {
  font-family: "Microsoft YaHei", sans-serif;
  color: var(--fg-dim);
  margin: 2px 0 12px 6px; font-size: 13px;
}

/* 表格 */
#content table { border-collapse: collapse; margin: 12px 0; width: 100%; font-size: 13px; box-shadow: var(--shadow); }
#content th, #content td { border: 1px solid var(--panel-border); padding: 7px 12px; text-align: left; vertical-align: top; }
#content th { background: var(--bg3); font-weight: 700; color: var(--fg-bright); }
#content tr:nth-child(even) td { background: color-mix(in srgb, var(--accent) 4%, var(--bg2)); }
#content tr:hover td { background: color-mix(in srgb, var(--accent) 9%, var(--bg2)); }

/* 提示框 */
#content .note, #content .warn, #content .info {
  margin: 14px 0;
  padding: 12px 16px;
  border-radius: 3px;
  font-size: 13px;
  line-height: 1.7;
  box-shadow: var(--shadow);
  border: 1px solid;
  border-left-width: 4px;
}
#content .note { border-color: color-mix(in srgb, var(--accent) 40%, transparent); border-left-color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, var(--bg2)); color: var(--fg); }
#content .warn { border-color: color-mix(in srgb, var(--accent2) 45%, transparent); border-left-color: var(--accent2); background: color-mix(in srgb, var(--accent2) 12%, var(--bg2)); color: var(--fg); }
#content .info { border-color: color-mix(in srgb, var(--accent3) 40%, transparent); border-left-color: var(--accent3); background: color-mix(in srgb, var(--accent3) 10%, var(--bg2)); color: var(--fg); }

/* 面包屑 + 章节位置 */
.crumb { font-size: 12px; color: var(--fg-dim); margin-bottom: 12px; }
.crumb a { color: var(--accent); border: none; }
.crumb a:hover { color: var(--accent2); }
#chapter-pos {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 11px; color: var(--fg-dim);
  background: var(--bg1);
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  padding: 2px 12px;
  margin-left: 8px;
}

/* 页脚导航 */
#content .page-nav {
  display: flex; justify-content: space-between; gap: 8px;
  margin-top: 34px; padding-top: 16px;
  border-top: 1px solid var(--panel-border);
}
#content .page-nav a {
  display: inline-block;
  padding: 8px 18px;
  font-size: 13px; font-weight: 700;
  color: var(--bg2);
  background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent) 60%, var(--accent2)));
  border-radius: 3px;
  text-decoration: none;
  box-shadow: var(--shadow);
  transition: filter 0.15s, transform 0.08s;
}
#content .page-nav a:hover { filter: brightness(1.12); transform: translateY(-1px); color: var(--bg2); border: none; }
#content .page-nav a.next { margin-left: auto; }

/* 折叠示例 */
details.demo {
  margin: 12px 0;
  border: 1px solid var(--panel-border);
  background: var(--bg1);
  border-radius: 3px;
  overflow: hidden;
}
details.demo summary {
  padding: 10px 14px; cursor: pointer;
  font-weight: 700; font-size: 13px;
  color: var(--fg-bright);
  background: var(--bg3);
  transition: background 0.15s;
}
details.demo summary:hover { background: var(--hover); }
details.demo pre { border: none; border-top: 1px solid var(--panel-border); margin: 0; border-radius: 0; box-shadow: none; }

/* 内容分段入场动画 */
#content .reveal { animation: revealUp 0.5s ease backwards; }
@keyframes revealUp { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }

/* ================= 手机版适配（≤900px） ================= */
@media (max-width: 900px) {
  body { overflow: hidden; }
  #help { height: 100vh; height: 100dvh; }

  #toolbar { height: 46px; padding: 0 4px; }
  #toolbar .tb-title { font-size: 12px; margin-right: 6px; }
  .tb-hide-mobile { display: none !important; }
  #tb-nav-toggle { display: inline-flex; }

  #main { flex-direction: column; }

  #nav {
    position: fixed; top: 46px; left: 0; bottom: 0;
    width: 84%; max-width: 330px;
    z-index: 100;
    box-shadow: 6px 0 24px rgba(0,0,0,0.4);
    transform: translateX(-104%);
    transition: transform 0.26s cubic-bezier(0.25, 0.8, 0.3, 1);
  }
  #nav.collapsed {
    width: 84%; max-width: 330px;
    border-right: 1px solid var(--panel-border);
  }
  #nav.open { transform: translateX(0); }
  #nav-mask {
    display: none; position: fixed; inset: 46px 0 0 0;
    background: rgba(0,0,0,0.45); z-index: 90;
  }
  #nav-mask.open { display: block; }

  #content { padding: 16px 16px 36px; font-size: 15px; }
  #content h1 { font-size: 20px; }
  #content h2 { font-size: 17px; }
  #content pre { font-size: 11.5px; padding-left: 40px; }
  #content pre::before { width: 30px; font-size: 10px; }
  #content table { font-size: 12px; }
  #content .param { font-size: 12px; }
  #content .page-nav a { padding: 9px 14px; font-size: 13px; }
}