/* ============================================================
   《DeepSeek Harness 源码解析》共享样式
   无第三方依赖；支持浅色/深色（跟随系统）。黑蓝色调。
   ============================================================ */

:root {
  --bg: #f6f8fc;
  --bg-panel: #eef2f9;
  --bg-code: #e8edf7;
  --bg-header: rgba(246, 248, 252, 0.92);
  --fg: #182338;
  --fg-muted: #53627e;
  --fg-faint: #8492ac;
  --border: #d9e1ef;
  --border-strong: #bdcce4;
  --accent: #1f63d6;
  --accent-strong: #1749a8;
  --accent-soft: rgba(31, 99, 214, 0.09);
  --teal: #0f7c86;
  --teal-soft: rgba(15, 124, 134, 0.09);
  --gold: #99701f;
  --gold-soft: rgba(153, 112, 31, 0.10);
  --violet: #6d5aa8;
  --violet-soft: rgba(109, 90, 168, 0.09);
  --slate: #5c6470;
  --slate-soft: rgba(92, 100, 112, 0.08);
  --tone-accent: #1f63d6;        --tone-accent-fill: rgba(31, 99, 214, 0.09);
  --tone-teal: #0f7c86;          --tone-teal-fill: rgba(15, 124, 134, 0.09);
  --tone-gold: #99701f;          --tone-gold-fill: rgba(153, 112, 31, 0.10);
  --tone-violet: #6d5aa8;        --tone-violet-fill: rgba(109, 90, 168, 0.09);
  --tone-slate: #5c6470;         --tone-slate-fill: rgba(92, 100, 112, 0.08);
  --code-com: #7b88a3;
  --code-str: #1d7a4f;
  --code-key: #1f63d6;
  --code-num: #9a5b1f;
  --code-fn: #6d5aa8;
  --code-type: #0f7c86;
  --code-attr: #8a6d1f;
  --shadow: 0 1px 3px rgba(30, 45, 80, 0.07);
  --header-h: 3.2rem;   /* 页头实测高度，JS 会覆盖为精确像素值 */
  --toc-w: 378px;       /* 宽屏下常驻目录侧栏宽度 */
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a0e1a;
    --bg-panel: #101828;
    --bg-code: #070b13;
    --bg-header: rgba(10, 14, 26, 0.92);
    --fg: #dbe4f5;
    --fg-muted: #93a3c0;
    --fg-faint: #5f7094;
    --border: #1d2a45;
    --border-strong: #2c3d63;
    --accent: #4f8cff;
    --accent-strong: #7cabff;
    --accent-soft: rgba(79, 140, 255, 0.12);
    --teal: #4fc0c9;
    --teal-soft: rgba(79, 192, 201, 0.10);
    --gold: #d8ac54;
    --gold-soft: rgba(216, 172, 84, 0.10);
    --violet: #ab9be0;
    --violet-soft: rgba(171, 155, 224, 0.10);
    --slate: #9aa3b2;
    --slate-soft: rgba(154, 163, 178, 0.09);
    --tone-accent: #4f8cff;      --tone-accent-fill: rgba(79, 140, 255, 0.12);
    --tone-teal: #4fc0c9;        --tone-teal-fill: rgba(79, 192, 201, 0.10);
    --tone-gold: #d8ac54;        --tone-gold-fill: rgba(216, 172, 84, 0.10);
    --tone-violet: #ab9be0;      --tone-violet-fill: rgba(171, 155, 224, 0.10);
    --tone-slate: #9aa3b2;       --tone-slate-fill: rgba(154, 163, 178, 0.09);
    --code-com: #6d7c9c;
    --code-str: #7fc9a5;
    --code-key: #6aa8ff;
    --code-num: #d8ac54;
    --code-fn: #c0b0ee;
    --code-type: #62d3d8;
    --code-attr: #d1b26a;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.45);
    color-scheme: dark;
  }
}

/* ---------- 基础 ---------- */

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei",
    "PingFang SC", "Noto Sans SC", "Helvetica Neue", Arial, sans-serif;
  font-size: 16.5px;
  line-height: 1.95;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--accent-soft); }

a { color: var(--accent); text-decoration: none; border-bottom: 1px solid transparent; }
a:hover { border-bottom-color: var(--accent); }

hr.sep { border: none; border-top: 1px solid var(--border); margin: 3rem 0; }

/* ---------- 阅读进度条 ---------- */

#pb-progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 0;
  background: var(--accent); z-index: 60;
  transition: width 0.08s linear;
}

/* ---------- 站点头 ---------- */

#pb-header {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.55rem 1.25rem;
  background: var(--bg-header);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

#pb-header .pb-site {
  display: flex; align-items: baseline; gap: 0.6rem;
  font-weight: 600; color: var(--fg);
  border-bottom: none; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
#pb-header .pb-site:hover { border-bottom: none; }
#pb-header .pb-site .pb-mark { color: var(--accent); font-weight: 800; }
#pb-header .pb-site .pb-crumb {
  color: var(--fg-muted); font-weight: 500; font-size: 0.9em;
  overflow: hidden; text-overflow: ellipsis;
}

#pb-header .pb-headbtns { display: flex; gap: 0.5rem; align-items: center; }

.pb-btn {
  font: inherit; font-size: 0.86em; cursor: pointer;
  color: var(--fg-muted); background: transparent;
  border: 1px solid var(--border); border-radius: 8px;
  padding: 0.28em 0.8em;
}
.pb-btn:hover { color: var(--fg); border-color: var(--border-strong); }

#pb-header .pb-gh {
  display: inline-flex; align-items: center;
  color: var(--fg-muted);
  border-bottom: none;
}
#pb-header .pb-gh svg { width: 18px; height: 18px; display: block; }
#pb-header .pb-gh:hover { color: var(--accent); }
#pb-header .pb-sep { color: var(--fg-faint); font-size: 0.86em; }

/* ---------- 语言切换（中文 | English） ---------- */

#pb-header .pb-lang {
  display: inline-flex; align-items: center;
  gap: 0.3em; font-size: 0.86em; white-space: nowrap;
  margin-right: 0.15em;
}
#pb-header .pb-lang .pb-lang-item {
  display: inline-flex; align-items: center;
  padding: 0.16em 0.6em; border-radius: 999px;
  color: var(--fg-muted); border-bottom: none;
  border: 1px solid transparent; line-height: 1.25;
}
#pb-header .pb-lang a.pb-lang-item:hover { color: var(--fg); border-color: var(--border-strong); }
#pb-header .pb-lang .pb-lang-item.cur {
  font-weight: 700; color: var(--accent-strong);
  background: var(--accent-soft);
}
#pb-header .pb-lang .pb-lang-sep { color: var(--fg-faint); }

/* ---------- 目录抽屉 ---------- */

#pb-drawer {
  position: fixed; inset: 0; z-index: 70;
  background: rgba(8, 12, 24, 0.45);
  opacity: 0; pointer-events: none; transition: opacity 0.18s ease;
}
#pb-drawer.open { opacity: 1; pointer-events: auto; }
#pb-drawer .pb-drawer-panel {
  position: absolute; top: 0; right: 0; bottom: 0;
  width: min(430px, 92vw);
  background: var(--bg); border-left: 1px solid var(--border);
  overflow-y: auto; padding: 1.2rem 1.4rem 2.5rem;
  transform: translateX(18px); transition: transform 0.18s ease;
}
#pb-drawer.open .pb-drawer-panel { transform: translateX(0); }
#pb-drawer h3 { margin: 1.1em 0 0.35em; font-size: 0.82em; letter-spacing: 0.12em; color: var(--fg-faint); }
#pb-drawer ol { list-style: none; margin: 0; padding: 0; }
#pb-drawer li { margin: 0; }
#pb-drawer a {
  display: block; padding: 0.3em 0.6em; border-radius: 8px;
  color: var(--fg); border-bottom: none; font-size: 0.95em;
}
#pb-drawer a:hover { background: var(--bg-panel); }
#pb-drawer a.here { background: var(--accent-soft); color: var(--accent-strong); font-weight: 600; }
#pb-drawer a .pb-no { color: var(--fg-faint); font-variant-numeric: tabular-nums; margin-right: 0.5em; font-size: 0.9em; }

/* ---------- 页面骨架 ---------- */

#pb-main {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
}

#pb-main .pb-content-col { min-width: 0; }

/* ---------- 微宽：全书目录常驻左侧栏（窄屏仍为抽屉） ---------- */

@media (min-width: 1180px) {
  /* 目录常驻后，页头的「目录」按钮不再需要 */
  #pb-toc-btn, #pb-header .pb-sep { display: none; }

  #pb-drawer {
    top: 0; bottom: 0; left: 0; right: auto;
    width: var(--toc-w);
    z-index: 30;                 /* 低于页头(50)，侧栏不会盖住 header */
    background: transparent;     /* 去掉遮罩 */
    opacity: 1; pointer-events: auto;
    transition: none;
  }
  #pb-drawer .pb-drawer-head { display: none; }
  #pb-drawer .pb-drawer-panel {
    top: var(--header-h); left: 0; right: 0; bottom: 0;
    width: auto;
    background: var(--bg-panel);
    border-left: none;
    border-right: 1px solid var(--border);
    transform: none;
    transition: none;
  }

  /* 正文单列，占满侧栏右侧区域（此档暂不显示章内目录） */
  #pb-main {
    max-width: none;
    margin: 0 0 0 var(--toc-w);
    padding: 0 1.25rem 4rem 1.5rem;
  }
}

/* ---------- 宽屏：右侧再加章内目录（贴右） ---------- */

@media (min-width: 1600px) {
  #pb-main {
    grid-template-columns: minmax(0, 1fr) 370.44px;
    gap: 2.5rem;
    padding-right: 0;             /* 章内目录贴到页面右缘 */
  }
  /* 特异性需高于下方的 #pb-toc { display:none } 基础规则 */
  #pb-main #pb-toc { display: block; }
}

#pb-toc {
  display: none;
  position: sticky; top: 4.2rem;
  align-self: start;
  max-height: calc(100vh - 5.5rem);
  overflow-y: auto;
  margin-top: 3.2rem;
  font-size: 0.85em;
  line-height: 1.6;
  border-left: 1px solid var(--border);
  padding-left: 1rem;
  padding-right: 1.25rem;
}
#pb-toc .pb-toc-title {
  font-size: 0.8em; letter-spacing: 0.14em; color: var(--fg-faint);
  text-transform: uppercase; margin-bottom: 0.6em;
}
#pb-toc a {
  display: block; color: var(--fg-muted); border-bottom: none;
  padding: 0.16em 0;
}
#pb-toc a.lv3 { padding-left: 1.1em; font-size: 0.93em; }
#pb-toc a:hover { color: var(--fg); }
#pb-toc a.here { color: var(--accent-strong); font-weight: 600; }

/* ---------- 章节正文 ---------- */

article.chapter { max-width: 1185px; margin: 0 auto; width: 100%; padding-top: 2.6rem; }

.chapter-head { margin-bottom: 2.6rem; }
.chapter-kicker {
  margin: 0 0 0.4rem; font-size: 0.85em; letter-spacing: 0.16em;
  color: var(--accent); font-weight: 700;
}
.chapter-head h1 { margin: 0 0 0.5rem; font-size: 2.05em; line-height: 1.35; letter-spacing: 0.01em; }
.chapter-sub { margin: 0; color: var(--fg-muted); font-size: 1.02em; }

article.chapter h2 {
  margin: 3.2rem 0 1.1rem; padding-top: 1.4rem;
  font-size: 1.45em; line-height: 1.45;
  border-top: 1px solid var(--border);
}
article.chapter h2 .pb-h2mark { color: var(--accent); margin-right: 0.45rem; font-weight: 800; }
article.chapter h3 { margin: 2.3rem 0 0.8rem; font-size: 1.17em; }
article.chapter h4 { margin: 1.8rem 0 0.6rem; font-size: 1.02em; color: var(--fg-muted); }

article.chapter p { margin: 0.95em 0; }
article.chapter ul, article.chapter ol { padding-left: 1.5em; margin: 0.9em 0; }
article.chapter li { margin: 0.32em 0; }
article.chapter li > ul, article.chapter li > ol { margin: 0.2em 0; }

blockquote {
  margin: 1.6em 0; padding: 0.6em 1.3em;
  border-left: 3px solid var(--border-strong);
  background: var(--bg-panel); border-radius: 0 10px 10px 0;
  color: var(--fg-muted);
}
blockquote p { margin: 0.4em 0; }

/* 序言题记 */
.epigraph {
  margin: 2.2em 0; padding: 1.1em 1.5em;
  border: 1px solid var(--border); border-radius: 12px;
  background: var(--accent-soft); font-size: 0.98em;
}
.epigraph p { margin: 0.3em 0; }

/* ---------- 行内代码 / 路径 ---------- */

code {
  font-family: "Cascadia Code", "JetBrains Mono", Consolas, "SF Mono", Menlo, monospace;
  font-size: 0.86em;
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 0.08em 0.38em;
  overflow-wrap: anywhere;
}

/* ---------- 代码块 ---------- */

figure.codeblock {
  margin: 1.5em 0; border-radius: 12px; overflow: hidden;
  border: 1px solid var(--border); background: var(--bg-code);
  box-shadow: var(--shadow);
}
figure.codeblock .cb-head {
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
  padding: 0.38em 1em;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  font-size: 0.78em; color: var(--fg-muted);
}
figure.codeblock .cb-file {
  font-family: "Cascadia Code", Consolas, monospace;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
figure.codeblock .cb-lang { flex: none; letter-spacing: 0.1em; text-transform: uppercase; color: var(--fg-faint); }
figure.codeblock pre {
  margin: 0; padding: 0.95em 1.15em; overflow-x: auto;
  font-family: "Cascadia Code", "JetBrains Mono", Consolas, "SF Mono", Menlo, monospace;
  font-size: 13.6px; line-height: 1.75; tab-size: 4;
}
figure.codeblock pre code { background: none; border: none; padding: 0; font-size: inherit; }

.c-com { color: var(--code-com); font-style: italic; }
.c-str { color: var(--code-str); }
.c-key { color: var(--code-key); font-weight: 600; }
.c-num { color: var(--code-num); }
.c-fn  { color: var(--code-fn); }
.c-type { color: var(--code-type); }
.c-attr { color: var(--code-attr); }
.c-pun { color: var(--fg-faint); }

/* ---------- canvas 插图 ---------- */

figure.fig {
  margin: 2em 0; text-align: center;
}
figure.fig .fig-box {
  display: inline-block; max-width: 100%;
  border: 1px solid var(--border); border-radius: 14px;
  background: var(--bg);
  box-shadow: var(--shadow);
  padding: 14px;
}
figure.fig canvas { display: block; max-width: 100%; height: auto; }
figure.fig figcaption {
  margin-top: 0.75em; font-size: 0.86em; color: var(--fg-muted); line-height: 1.7;
}

/* ---------- 提示框 ---------- */

.callout {
  margin: 1.7em 0; padding: 0.85em 1.25em 0.75em;
  border: 1px solid var(--border); border-left-width: 4px;
  border-radius: 10px; font-size: 0.95em;
}
.callout .callout-title { font-weight: 700; margin-bottom: 0.25em; font-size: 0.92em; letter-spacing: 0.03em; }
.callout p { margin: 0.4em 0; }
.callout.note   { border-left-color: var(--teal);   background: var(--teal-soft); }
.callout.note .callout-title { color: var(--teal); }
.callout.compare { border-left-color: var(--violet); background: var(--violet-soft); }
.callout.compare .callout-title { color: var(--violet); }
.callout.deep   { border-left-color: var(--gold);   background: var(--gold-soft); }
.callout.deep .callout-title { color: var(--gold); }
.callout.warn   { border-left-color: var(--accent); background: var(--accent-soft); }
.callout.warn .callout-title { color: var(--accent-strong); }

/* ---------- 表格 ---------- */

.table-wrap { overflow-x: auto; margin: 1.6em 0; border: 1px solid var(--border); border-radius: 12px; }
table { border-collapse: collapse; width: 100%; font-size: 0.92em; line-height: 1.65; }
th, td { padding: 0.55em 0.95em; text-align: left; vertical-align: top; border-bottom: 1px solid var(--border); }
th { background: var(--bg-panel); font-weight: 700; white-space: nowrap; }
tr:last-child td { border-bottom: none; }
td { color: var(--fg); }
tbody tr:hover { background: var(--bg-panel); }

/* ---------- 键位 ---------- */

kbd {
  font-family: inherit; font-size: 0.8em;
  background: var(--bg-panel); border: 1px solid var(--border-strong);
  border-bottom-width: 2px; border-radius: 6px;
  padding: 0.1em 0.5em; color: var(--fg-muted); white-space: nowrap;
}

/* ---------- 章节底部导航 ---------- */

#pb-chapter-nav {
  display: grid; grid-template-columns: 1fr 1fr; gap: 1rem;
  max-width: 1185px; margin: 3.5rem auto 0; width: 100%;
}
#pb-chapter-nav a {
  border: 1px solid var(--border); border-radius: 12px;
  padding: 0.9em 1.2em; border-bottom: 1px solid var(--border);
  background: var(--bg); box-shadow: var(--shadow);
  color: var(--fg); display: block;
}
#pb-chapter-nav a:hover { border-color: var(--accent); }
#pb-chapter-nav .pb-nav-kicker { font-size: 0.78em; color: var(--fg-faint); letter-spacing: 0.08em; }
#pb-chapter-nav .pb-nav-title { font-weight: 600; margin-top: 0.15em; color: var(--accent-strong); }
#pb-chapter-nav a.next { text-align: right; }
#pb-chapter-nav a.ghost { visibility: hidden; }

#pb-footer {
  max-width: 1185px; margin: 3rem auto 0; padding-top: 1.4rem;
  border-top: 1px solid var(--border);
  color: var(--fg-faint); font-size: 0.85em; line-height: 1.8;
}

/* ---------- 序言 / 目录页 ---------- */

.toc-part { margin: 2.4em 0 0.6em; }
.toc-part h3 {
  margin: 0 0 0.2em; font-size: 1.05em; color: var(--accent-strong);
}
.toc-part .toc-part-sub { margin: 0 0 0.7em; color: var(--fg-muted); font-size: 0.92em; font-style: italic; }
.toc-list { list-style: none; padding: 0; margin: 0; }
.toc-list li { margin: 0; }
.toc-list a {
  display: grid; grid-template-columns: 3.2em 1fr auto; gap: 0.9em; align-items: baseline;
  padding: 0.55em 0.85em; border-radius: 10px; border-bottom: none; color: var(--fg);
}
.toc-list a:hover { background: var(--bg-panel); }
.toc-list .toc-no { color: var(--fg-faint); font-variant-numeric: tabular-nums; font-size: 0.9em; }
.toc-list .toc-title { font-weight: 600; }
.toc-list .toc-brief { color: var(--fg-muted); font-size: 0.88em; text-align: right; }
@media (max-width: 720px) {
  .toc-list a { grid-template-columns: 2.6em 1fr; }
  .toc-list .toc-brief { display: none; }
}

/* ---------- 小屏 ---------- */

@media (max-width: 720px) {
  body { font-size: 15.5px; }
  article.chapter { padding-top: 1.6rem; }
  .chapter-head h1 { font-size: 1.6em; }
  #pb-chapter-nav { grid-template-columns: 1fr; }
  #pb-chapter-nav a.next { text-align: left; }
}

/* ---------- 返回顶部 ---------- */

#pb-top {
  position: fixed; right: 1.1rem; bottom: 1.3rem; z-index: 40;
  width: 2.5rem; height: 2.5rem; border-radius: 50%;
  border: 1px solid var(--border); background: var(--bg-panel);
  color: var(--fg-muted); cursor: pointer; font-size: 1rem;
  opacity: 0; pointer-events: none; transition: opacity 0.2s ease;
  box-shadow: var(--shadow);
}
#pb-top.show { opacity: 1; pointer-events: auto; }

/* ---------- 打印 ---------- */

@media print {
  #pb-header, #pb-toc, #pb-chapter-nav, #pb-progress, #pb-top, #pb-drawer { display: none !important; }
  body { background: #fff; color: #000; }
  article.chapter { max-width: none; }
}