/* JEV ENGINEERING 中文手册 — 共享样式 */
:root {
  --ink: #1a1a1a;
  --ink-soft: #444;
  --ink-faint: #767676;
  --paper: #fdfcf9;
  --card: #ffffff;
  --rule: #d9d5cc;
  --rule-soft: #eae7e0;
  --accent: #8b1a1a;      /* 学术深红 */
  --accent-soft: #f6eeee;
  --blue: #2b4a7a;
  --code-bg: #f4f2ed;
  --serif: "Noto Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif;
  --mono: "SF Mono", "JetBrains Mono", Consolas, "Courier New", monospace;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--serif);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.85;
  font-size: 16px;
}
/* ---------- 布局 ---------- */
.layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 264px; flex-shrink: 0;
  border-right: 1px solid var(--rule);
  background: var(--card);
  position: sticky; top: 0; height: 100vh; overflow-y: auto;
  padding: 22px 0 30px;
}
.sidebar .brand {
  padding: 0 20px 14px; border-bottom: 1px solid var(--rule-soft); margin-bottom: 12px;
}
.sidebar .brand .zh { font-weight: 700; font-size: 15px; letter-spacing: .04em; }
.sidebar .brand .en {
  font-family: var(--sans); font-size: 10px; color: var(--ink-faint);
  letter-spacing: .12em; text-transform: uppercase; margin-top: 3px;
}
.sidebar nav a {
  display: flex; gap: 9px; align-items: baseline;
  padding: 6px 20px; text-decoration: none; color: var(--ink-soft);
  font-size: 13.5px; font-family: var(--sans); line-height: 1.5;
  border-left: 3px solid transparent;
}
.sidebar nav a:hover { background: var(--accent-soft); color: var(--accent); }
.sidebar nav a.active { border-left-color: var(--accent); color: var(--accent); font-weight: 600; background: var(--accent-soft); }
.sidebar nav a .no { font-family: var(--serif); font-size: 11.5px; color: var(--ink-faint); min-width: 22px; }
.sidebar nav a.active .no { color: var(--accent); }
.main { flex: 1; min-width: 0; }
.page { max-width: 820px; margin: 0 auto; padding: 0 40px 90px; }

/* ---------- 页眉 ---------- */
.running-head {
  display: flex; justify-content: space-between; align-items: baseline;
  border-bottom: 1px solid var(--ink); padding: 14px 0 8px; margin-bottom: 34px;
  font-family: var(--sans); font-size: 11px; color: var(--ink-faint);
  letter-spacing: .05em;
}
.running-head a { color: var(--ink-faint); text-decoration: none; }
.running-head a:hover { color: var(--accent); }

/* ---------- 章节标题区（对应 PDF 每页页首） ---------- */
.chapter-head { text-align: left; margin-bottom: 38px; }
.chapter-head .sec-no {
  font-family: var(--sans); font-size: 13px; letter-spacing: .35em;
  color: var(--accent); font-weight: 700; margin-bottom: 8px;
}
.chapter-head h1 {
  font-size: 31px; font-weight: 700; letter-spacing: .015em; line-height: 1.35;
  margin-bottom: 6px;
}
.chapter-head .h1-en {
  font-family: var(--sans); font-size: 12px; font-weight: 500;
  color: var(--ink-faint); letter-spacing: .18em; text-transform: uppercase;
  margin-bottom: 16px;
}
.chapter-head .kicker {
  display: inline-block; font-family: var(--sans); font-size: 12.5px;
  color: var(--blue); background: #eef2f8; border: 1px solid #d5deec;
  padding: 3px 14px; border-radius: 999px; letter-spacing: .08em;
}
h2 {
  font-size: 19px; margin: 40px 0 14px; padding-bottom: 8px;
  border-bottom: 1px solid var(--rule-soft); letter-spacing: .02em;
}
h2 .letter { color: var(--accent); font-family: var(--sans); font-size: 14px; margin-right: 8px; }
h2 .en { display: block; font-family: var(--sans); font-size: 10.5px; font-weight: 500;
  color: var(--ink-faint); letter-spacing: .15em; text-transform: uppercase; margin-top: 3px; }

/* ---------- 正文 ---------- */
p { margin: 0 0 15px; text-align: justify; }
strong { color: #000; }
.term { border-bottom: 1px dashed var(--accent); cursor: help; }
p code, li code, td code {
  font-family: var(--mono); font-size: 13px; background: var(--code-bg);
  padding: 1px 6px; border-radius: 4px; color: #7a3300;
}

/* ---------- 表格 ---------- */
.tbl-wrap { margin: 26px 0 8px; overflow-x: auto; }
table.paper {
  width: 100%; border-collapse: collapse; font-family: var(--sans);
  font-size: 13px; background: var(--card);
  border-top: 2px solid var(--ink); border-bottom: 2px solid var(--ink);
}
table.paper th {
  text-align: left; padding: 8px 12px; font-size: 11.5px; letter-spacing: .06em;
  border-bottom: 1px solid var(--ink); font-weight: 700; white-space: nowrap;
}
table.paper td { padding: 7px 12px; border-bottom: 1px solid var(--rule-soft); vertical-align: top; }
table.paper tr:last-child td { border-bottom: none; }
table.paper td.num { text-align: right; font-family: var(--mono); font-size: 12.5px; white-space: nowrap; }
table.paper code { font-family: var(--mono); font-size: 12px; }
.caption {
  font-family: var(--sans); font-size: 12px; color: var(--ink-soft);
  margin: 10px 2px 0; line-height: 1.7;
}
.caption b { color: var(--ink); }

/* ---------- 代码块 ---------- */
.code-wrap { margin: 24px 0 8px; }
.code-head {
  font-family: var(--sans); font-size: 11px; letter-spacing: .12em;
  color: var(--ink-faint); background: #e9e6df; border: 1px solid var(--rule);
  border-bottom: none; border-radius: 8px 8px 0 0; padding: 6px 14px;
  text-transform: uppercase;
}
pre.code {
  font-family: var(--mono); font-size: 12.8px; line-height: 1.65;
  background: var(--code-bg); border: 1px solid var(--rule); border-radius: 0 0 8px 8px;
  padding: 16px 18px; overflow-x: auto; color: #2e2a24; white-space: pre;
}
pre.code .cm { color: #7c8a6e; }      /* 注释 */
pre.code .kw { color: #8b1a1a; font-weight: 600; }
pre.code .st { color: #2b4a7a; }
pre.code .fn { color: #6b4fa0; }

/* ---------- 图 ---------- */
figure { margin: 30px 0; text-align: center; }
figure svg { max-width: 100%; height: auto; }
figcaption {
  font-family: var(--sans); font-size: 12.5px; color: var(--ink-soft);
  margin-top: 12px; line-height: 1.7; text-align: left;
}
figcaption b { color: var(--ink); }
figcaption .en { color: var(--ink-faint); font-size: 11px; display: block; margin-top: 2px; font-style: italic; }

/* ---------- 列表 ---------- */
ul, ol { padding-left: 1.6em; margin: 12px 0 15px; }
li { margin-bottom: 4px; }

/* ---------- 提示块 ---------- */
.note {
  border-left: 3px solid var(--accent); background: var(--accent-soft);
  padding: 12px 18px; margin: 20px 0; font-size: 14.5px; border-radius: 0 6px 6px 0;
}
.trans-note {
  font-family: var(--sans); font-size: 12px; color: var(--ink-faint);
  background: #f2f1ec; border: 1px dashed var(--rule); border-radius: 6px;
  padding: 8px 14px; margin: 18px 0; line-height: 1.7;
}

/* ---------- 底部翻页 ---------- */
.pager {
  display: flex; justify-content: space-between; gap: 16px;
  border-top: 1px solid var(--rule); margin-top: 56px; padding-top: 22px;
}
.pager a {
  flex: 1; text-decoration: none; color: var(--ink-soft);
  border: 1px solid var(--rule); background: var(--card); border-radius: 8px;
  padding: 13px 18px; font-family: var(--sans); font-size: 13px;
  transition: all .15s;
}
.pager a:hover { border-color: var(--accent); color: var(--accent); }
.pager a .dir { display: block; font-size: 10.5px; color: var(--ink-faint); letter-spacing: .15em; margin-bottom: 4px; }
.pager a.next { text-align: right; }
.pager .spacer { flex: 1; }

/* ---------- 首页 ---------- */
.cover-index { max-width: 860px; margin: 0 auto; padding: 60px 40px 90px; }
.cover-index .masthead { text-align: center; padding: 40px 0 30px; border-bottom: 2px solid var(--ink); }
.cover-index .masthead .series { font-family: var(--sans); font-size: 12px; letter-spacing: .25em; color: var(--ink-faint); margin-bottom: 20px; }
.cover-index .masthead h1 { font-size: 40px; letter-spacing: .02em; line-height: 1.3; }
.cover-index .masthead h1 .en { display: block; font-family: var(--sans); font-size: 13px; font-weight: 600; color: var(--accent); letter-spacing: .3em; margin-bottom: 14px; text-transform: uppercase; }
.cover-index .masthead .sub { margin-top: 18px; font-size: 16px; color: var(--ink-soft); }
.cover-index .masthead .sub-en { font-family: var(--sans); font-size: 12px; color: var(--ink-faint); margin-top: 6px; letter-spacing: .05em; }
.toc { margin-top: 44px; }
.toc h2 { font-size: 15px; letter-spacing: .2em; color: var(--ink-faint); font-family: var(--sans); border: none; margin-bottom: 18px; }
.toc ol { list-style: none; }
.toc li { border-bottom: 1px solid var(--rule-soft); }
.toc a {
  display: flex; align-items: baseline; gap: 16px; padding: 14px 6px;
  text-decoration: none; color: var(--ink);
}
.toc a:hover { background: var(--accent-soft); }
.toc .no { font-family: var(--sans); font-size: 12px; color: var(--accent); font-weight: 700; min-width: 34px; letter-spacing: .05em; }
.toc .zh { font-size: 16.5px; font-weight: 600; }
.toc .en2 { font-family: var(--sans); font-size: 11px; color: var(--ink-faint); letter-spacing: .08em; text-transform: uppercase; margin-top: 2px; display: block; }
.toc .kick { margin-left: auto; font-family: var(--sans); font-size: 11.5px; color: var(--blue); white-space: nowrap; }
.site-meta { margin-top: 50px; padding-top: 20px; border-top: 1px solid var(--rule);
  font-family: var(--sans); font-size: 12px; color: var(--ink-faint); line-height: 1.9; }

/* ---------- 封面页(page01) ---------- */
.paper-cover { text-align: center; padding-top: 30px; }
.paper-cover .title-en { font-family: var(--sans); font-weight: 800; font-size: 34px; letter-spacing: .06em; line-height: 1.25; }
.paper-cover .title-zh { font-size: 30px; font-weight: 700; margin-top: 14px; letter-spacing: .06em; }
.paper-cover .subtitle { font-size: 17px; color: var(--ink-soft); margin-top: 22px; }
.paper-cover .companion { font-family: var(--sans); font-size: 12.5px; color: var(--ink-faint); margin-top: 14px; }
.paper-cover .disclaimer { font-family: var(--sans); font-size: 11.5px; color: var(--ink-faint); font-style: italic; margin-top: 6px; }
.abstract-box { text-align: left; margin-top: 44px; border-top: 2px solid var(--ink); border-bottom: 1px solid var(--ink); padding: 26px 0 22px; }
.abstract-box .ab-label { font-family: var(--sans); font-size: 12.5px; font-weight: 800; letter-spacing: .3em; margin-bottom: 14px; }
.abstract-box .cols { display: grid; grid-template-columns: 1fr 1fr; gap: 34px; }
.abstract-box p { font-size: 14.5px; }
.index-terms { text-align: left; margin-top: 30px; }
.index-terms .lbl { font-family: var(--sans); font-size: 12px; font-weight: 800; letter-spacing: .2em; margin-bottom: 8px; }
.index-terms .terms { font-size: 13.5px; color: var(--ink-soft); line-height: 2.1; }
.index-terms .terms span { background: #eef2f8; border: 1px solid #d5deec; border-radius: 4px; padding: 2px 9px; margin-right: 7px; font-family: var(--sans); font-size: 12px; white-space: nowrap; display: inline-block; margin-bottom: 6px; }

/* ---------- 响应式 ---------- */
#sidebar-toggle { display: none; }
@media (max-width: 960px) {
  .sidebar { position: fixed; left: -280px; z-index: 50; transition: left .2s; box-shadow: 4px 0 20px rgba(0,0,0,.08); }
  body.nav-open .sidebar { left: 0; }
  #sidebar-toggle {
    display: block; position: fixed; top: 12px; left: 12px; z-index: 60;
    background: var(--card); border: 1px solid var(--rule); border-radius: 8px;
    width: 42px; height: 42px; font-size: 18px; cursor: pointer; color: var(--ink);
  }
  .page { padding: 0 22px 70px; }
  .running-head { margin-top: 40px; }
  .abstract-box .cols { grid-template-columns: 1fr; gap: 18px; }
  .cover-index { padding: 30px 22px 70px; }
  .toc .kick { display: none; }
}
@media print {
  .sidebar, #sidebar-toggle, .pager { display: none; }
  body { background: #fff; }
}