:root {
  --bg: #ebe3d1;
  --paper: #fffaf1;
  --ink: #1a1712;
  --muted: #6a6358;
  --faint: #8d8474;
  --line: #d8cdb8;
  --rule: #e7ddc8;
  --tint: #f7f0e1;
  --forest: #1d4a38;
  --moss: #2f7d4f;
  --sage: #e6f0e8;
  --clay: #8b3d22;
  --sky: #1e4b7a;
  --gold: #9a6b16;
  --chip: #f3ead8;
  --mark: #f6e2a8;
  --code-bg: #f3ead8;
  --pre-bg: #211d17;
  --pre-ink: #f2ecdf;
  --shadow: 0 1px 2px rgba(38, 30, 18, 0.05), 0 8px 24px rgba(38, 30, 18, 0.05);
  --fs-body: 16.5px;
  --fs-small: 14.5px;
  --lh-body: 1.62;
  --lh-read: 1.78;
  --radius: 8px;
  --serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", Georgia, serif;
  --sans: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", system-ui, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

html[data-type="large"] {
  --fs-body: 18px;
  --fs-small: 16px;
  --lh-read: 1.85;
}

html[data-theme="night"] {
  --bg: #14120f;
  --paper: #1c1916;
  --ink: #e9e1d3;
  --muted: #a79d8b;
  --faint: #8c8271;
  --line: #37312a;
  --rule: #2b2620;
  --tint: #242019;
  --forest: #8ed3a8;
  --moss: #7cc79a;
  --sage: #23302a;
  --clay: #e0a184;
  --sky: #92bce8;
  --gold: #d7b167;
  --chip: #262119;
  --mark: #6b5a24;
  --code-bg: #272219;
  --pre-bg: #100e0c;
  --pre-ink: #e9e1d3;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

* { box-sizing: border-box; }
html {
  scroll-behavior: smooth;
  scroll-padding-top: 64px;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font: var(--fs-body)/var(--lh-body) var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  padding-bottom: env(safe-area-inset-bottom, 0px);
}

a { color: var(--sky); text-underline-offset: 2px; }
a:hover { color: var(--forest); }
:focus-visible {
  outline: 2px solid var(--moss);
  outline-offset: 2px;
  border-radius: 4px;
}
::selection { background: var(--mark); color: var(--ink); }
mark {
  background: var(--mark);
  color: inherit;
  border-radius: 3px;
  padding: 0 1px;
}

/* ---------- 顶栏 ---------- */

.site-bar {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  border-bottom: 1px solid var(--rule);
}
.site-bar nav {
  max-width: 1000px;
  margin: 0 auto;
  padding: 7px 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 12px;
  align-items: center;
}
.site-bar .brand {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--forest);
  text-decoration: none;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 16.5px;
  letter-spacing: 0.02em;
  margin-right: 6px;
}
.site-bar .brand::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--moss);
}
.site-bar a {
  color: var(--muted);
  text-decoration: none;
  font-size: var(--fs-small);
  padding: 2px 0;
  border-bottom: 1.5px solid transparent;
}
.site-bar a:hover { color: var(--forest); }
.site-bar a.on { color: var(--forest); border-bottom-color: var(--moss); }
.site-bar .grow { flex: 1; }

.bar-btn {
  flex: none;
  white-space: nowrap;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  border-radius: 999px;
  padding: 3px 10px;
  font: inherit;
  font-size: 13.5px;
  line-height: 1.5;
  cursor: pointer;
}
.bar-btn:hover { border-color: var(--moss); color: var(--forest); }

.search-launch {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  flex: none;
  white-space: nowrap;
  border: 1px solid var(--line);
  background: var(--tint);
  color: var(--muted);
  border-radius: 999px;
  padding: 4px 12px 4px 13px;
  font: inherit;
  font-size: var(--fs-small);
  line-height: 1.4;
  cursor: pointer;
}
.search-launch:hover { border-color: var(--moss); color: var(--forest); }
.search-launch kbd {
  margin: 0;
  padding: 1px 5px;
  line-height: 1.25;
}

/* ---------- 纸面 ---------- */

main.wrap {
  max-width: 1000px;
  margin: 14px auto 26px;
  padding: 20px 26px 30px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* ---------- 标题与正文 ---------- */

.kicker {
  display: inline-block;
  font-size: 12.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--moss);
  margin: 0 0 3px;
}
h1 {
  font-family: var(--serif);
  font-size: 30px;
  line-height: 1.24;
  letter-spacing: 0.01em;
  margin: 0 0 8px;
}
h2 {
  font-family: var(--serif);
  font-size: 21px;
  line-height: 1.35;
  margin: 26px 0 8px;
  padding-top: 11px;
  border-top: 1px solid var(--rule);
  scroll-margin-top: 64px;
}
h2:first-of-type { border-top: 0; padding-top: 0; margin-top: 16px; }
h3 {
  font-size: 17px;
  margin: 16px 0 5px;
  color: var(--forest);
}
.lead { color: var(--muted); margin: 0 0 10px; max-width: 62em; }
p { margin: 0 0 9px; }
.read-article p,
.read-article li { line-height: var(--lh-read); }
.read-article p { max-width: 66em; }
ul, ol { margin: 0 0 10px; padding-left: 22px; }
li { margin: 2px 0; }
li > ul, li > ol { margin: 2px 0; }
strong, b { font-weight: 700; }
hr { border: 0; border-top: 1px solid var(--rule); margin: 16px 0; }

.anchor {
  margin-left: 6px;
  font-size: 14.5px;
  color: var(--line);
  text-decoration: none;
  opacity: 0;
  transition: opacity 0.12s;
}
h2:hover .anchor, h3:hover .anchor, .anchor:focus-visible { opacity: 1; color: var(--moss); }

/* ---------- 首页 ---------- */

.resume {
  margin: 0 0 10px;
  padding-left: 10px;
  border-left: 2px solid var(--moss);
  font-size: var(--fs-small);
  color: var(--muted);
}
.resume a { text-decoration: none; font-weight: 600; }
.resume a:hover { text-decoration: underline; }

.home-tracks { margin: 0 0 6px; }
.home-tracks h2 { margin-top: 0; }
.home-tracks .lead { margin-bottom: 8px; }
.home-open { color: var(--faint); font-size: var(--fs-small); margin: 0 0 12px; }
.about-one { margin: 0; font-size: var(--fs-small); color: var(--muted); }

.about-me {
  margin: 0 0 16px;
  background: transparent;
  border: 0;
  padding: 0;
}
.about-card {
  display: block;
  background: var(--tint);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 16px 24px 14px;
}
.about-card .about-head {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 14px;
  width: auto;
  margin: 0 0 12px;
  padding: 0 0 12px;
  border-bottom: 1px solid var(--rule);
}
.about-card .about-mark { width: 64px; height: 64px; }
.about-card .about-name { font-size: 22px; }
.about-body {
  min-width: 0;
  width: 100%;
}
.about-body .about-list {
  display: block;
  columns: 2;
  column-gap: 44px;
  width: 100%;
  margin: 0 0 12px;
}
.about-body .about-list li {
  break-inside: avoid;
  margin: 0 0 11px;
  grid-template-columns: 3.4em minmax(0, 1fr);
  gap: 12px;
}
.about-body .about-links {
  margin: 0;
  padding-top: 11px;
  border-top: 1px solid var(--rule);
}
.about-head {
  display: flex;
  gap: 9px;
  align-items: center;
  margin: 0 0 5px;
}
.about-head p { margin: 0; color: var(--muted); font-size: var(--fs-small); }
.about-mark {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--paper);
  border: 1px solid var(--line);
  display: block;
  flex: none;
}
.about-me .kicker { margin-bottom: 2px; }
.about-name {
  display: block;
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.3;
  margin: 0;
}
.about-list { list-style: none; margin: 0 0 6px; padding: 0; display: grid; gap: 4px; }
.about-list li {
  display: grid;
  grid-template-columns: 3.2em 1fr;
  gap: 10px;
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.55;
  margin: 0;
}
.about-list b { color: var(--forest); font-size: 13.5px; letter-spacing: 0.06em; padding-top: 2px; }
.about-list a { color: var(--sky); text-decoration: none; }
.about-list a:hover { color: var(--forest); text-decoration: underline; }
.about-links { margin: 4px 0 0; }

.stats,
.statline {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 16px;
  margin: 8px 0 10px;
  padding: 0;
  border: 0;
  background: none;
  font-size: var(--fs-small);
  color: var(--muted);
}
.stat,
.statline span,
.statline a.stat-jump {
  display: inline-flex;
  align-items: baseline;
  gap: 4px;
  width: auto;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: none;
  box-shadow: none;
  min-height: 0;
}
.stat b,
.statline b {
  display: inline;
  font-family: var(--serif);
  font-size: 16.5px;
  color: var(--forest);
}
.stat span,
.statline a.stat-jump { color: var(--muted); font-size: var(--fs-small); text-decoration: none; }
.stats a.stat,
.statline a.stat-jump { cursor: pointer; }
.stats a.stat:hover b,
.statline a.stat-jump:hover b { color: var(--moss); }
.stats a.stat:hover,
.statline a.stat-jump:hover { color: var(--forest); }

/* ---------- 五条轨 ---------- */

.rails {
  list-style: none;
  margin: 8px 0 12px;
  padding: 0;
  border: 0;
  background: none;
  border-left: 2px solid var(--rule);
}
.rails .rail,
.rails li {
  display: block;
  position: relative;
  margin: 0;
  padding: 6px 0 6px 14px;
  border: 0;
  border-radius: 0;
  background: none;
  box-shadow: none;
  min-height: 0;
  font-size: 15.5px;
  line-height: 1.6;
  color: var(--muted);
}
.rails .rail + .rail { border-top: 1px dashed var(--rule); }
.rails .rail::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 15px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--moss);
}
.rails i {
  font-style: normal;
  font-weight: 700;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--moss);
  margin-right: 6px;
}
.rails b { color: var(--ink); margin-right: 6px; }
.rails .rail-links { display: block; margin-top: 4px; font-size: var(--fs-small); line-height: 1.65; }
.rails .rail-links a { text-decoration: none; }
.rails .rail-links a:hover { text-decoration: underline; }

.home-tracks .rails {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 28px;
  margin: 8px 0 0;
  border-left: 0;
}
.home-tracks .rails .rail {
  padding: 9px 0 9px 14px;
  border-left: 2px solid var(--rule);
}
.home-tracks .rails .rail + .rail { border-top: 0; }
.home-tracks .rails .rail::before { top: 16px; }

.full-path { margin: 8px 0 18px; }
.full-path summary {
  cursor: pointer;
  color: var(--forest);
  font-weight: 600;
  font-size: var(--fs-small);
}

/* ---------- 目录 ---------- */

.legend, .chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0 10px; }
.pill, button.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--line);
  background: transparent;
  border-radius: 999px;
  padding: 3px 11px;
  font: inherit;
  font-size: var(--fs-small);
  color: var(--muted);
  cursor: pointer;
}
button.chip:hover { border-color: var(--moss); color: var(--forest); }
button.chip.on { background: var(--forest); color: var(--paper); border-color: var(--forest); }

.jumps {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
  margin: 0 0 10px;
  font-size: 14px;
  color: var(--faint);
}
.jumps a { color: var(--muted); text-decoration: none; }
.jumps a:hover { color: var(--forest); text-decoration: underline; }

.shelves { display: grid; gap: 16px; }
.shelf-head h3 {
  margin: 0 0 2px;
  font-family: var(--serif);
  font-size: 17.5px;
  color: var(--ink);
  display: flex;
  align-items: baseline;
  gap: 7px;
}
.shelf-head h3::before {
  content: "";
  width: 3px;
  height: 13px;
  background: var(--moss);
  border-radius: 2px;
}
.shelf-n { font-size: 12.5px; color: var(--faint); font-family: var(--sans); font-weight: 400; }
.shelf-head p { color: var(--faint); margin: 0 0 6px; font-size: 14px; }

.catalog {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border-top: 1px solid var(--rule);
}
.item {
  display: block;
  position: relative;
  text-decoration: none;
  color: inherit;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--rule);
  border-right: 1px solid var(--rule);
  border-radius: 0;
  padding: 8px 10px 8px 12px;
  box-shadow: none;
  min-height: 0;
}
.item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 2px;
  border-radius: 2px;
  background: transparent;
}
.item:nth-child(2n) { border-right: 0; }
.item:hover { background: var(--tint); }
.item:hover::before { background: var(--moss); }
.item .top { display: flex; justify-content: space-between; gap: 8px; align-items: baseline; }
.item h3 { margin: 0 0 2px; font-size: 16px; color: var(--forest); }
.item p {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.item-meta { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 3px; }
.item-meta .mini-tag { display: none; }
.mini-tag, .seen-mark {
  font-size: 12.5px;
  color: var(--faint);
  background: var(--chip);
  border-radius: 999px;
  padding: 0 7px;
}
.item.seen h3 { color: var(--muted); }
.seen-mark { background: var(--sage); color: var(--forest); }

.badge {
  font-size: 12.5px;
  padding: 1px 7px;
  border: 1px solid var(--line);
  background: var(--chip);
  border-radius: 999px;
  white-space: nowrap;
  color: var(--muted);
}
.badge.map { background: #eef3f8; }
.badge.knowledge { background: var(--sage); }
.badge.project { background: #fff3dc; }
.badge.note { background: var(--chip); }
html[data-theme="night"] .badge.map,
html[data-theme="night"] .badge.project { background: var(--chip); }

input[type="search"] {
  width: 100%;
  max-width: 460px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  background: var(--tint);
  color: inherit;
  font: inherit;
  border-radius: 999px;
}
input[type="search"]:focus { background: var(--paper); border-color: var(--moss); }

.path {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  margin: 8px 0 10px;
  border-top: 1px solid var(--rule);
}
.path-step {
  display: grid;
  grid-template-columns: 2em 1fr;
  gap: 8px;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--rule);
  border-right: 1px solid var(--rule);
  border-radius: 0;
  padding: 6px 8px;
}
.path-step:nth-child(2n) { border-right: 0; }
.path-step .n {
  width: auto;
  height: auto;
  border-radius: 0;
  background: none;
  color: var(--moss);
  display: block;
  place-items: unset;
  font-size: 13.5px;
  font-weight: 700;
  padding-top: 3px;
}
.path-step a { font-weight: 600; text-decoration: none; color: var(--forest); font-size: 15.5px; }
.path-step a:hover { text-decoration: underline; }
.path-step p { margin: 1px 0 0; color: var(--faint); font-size: 14px; line-height: 1.5; }

/* ---------- 盒子 ---------- */

.note, .callout, .warn {
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 9px 12px;
  margin: 10px 0 12px;
  font-size: 15.5px;
}
.note { background: var(--sage); border: 1px solid var(--rule); border-left: 3px solid var(--moss); }
.callout { background: var(--tint); border: 1px solid var(--rule); border-left: 3px solid var(--gold); }
.warn { background: var(--tint); border: 1px solid var(--rule); border-left: 3px solid var(--clay); }
.note p:last-child, .callout p:last-child, .warn p:last-child { margin-bottom: 0; }

.example, .pitfall, .self-check {
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 9px 12px;
  margin: 10px 0 12px;
}
.example { background: #eef6f0; border: 1px solid var(--rule); border-left: 3px solid var(--moss); }
.pitfall { background: #f8eee6; border: 1px solid var(--rule); border-left: 3px solid var(--clay); }
.self-check { background: #eef3f8; border: 1px solid var(--rule); border-left: 3px solid var(--sky); }
.example > b, .pitfall > b, .self-check > b { display: block; color: var(--forest); margin-bottom: 4px; }
.pitfall > b { color: var(--clay); }
.self-check > b { color: var(--sky); }
.example p:last-child, .pitfall p:last-child, .self-check p:last-child { margin-bottom: 0; }
.self-check details { margin: 6px 0 0; }
.self-check summary { cursor: pointer; color: var(--forest); font-weight: 600; }
.self-check summary:hover { text-decoration: underline; }
ul.checklist {
  list-style: none;
  padding: 0;
  margin: 8px 0 12px;
}
ul.checklist li {
  position: relative;
  padding: 4px 0 4px 26px;
  margin: 0;
}
ul.checklist li::before {
  content: "☐";
  position: absolute;
  left: 4px;
  color: var(--moss);
  font-size: 15px;
}
.compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 10px 0 12px;
}
.compare .side {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 9px 11px;
  background: var(--tint);
}
.compare .side b { display: block; color: var(--forest); margin-bottom: 4px; }
.compare .side p:last-child { margin-bottom: 0; }
@media (max-width: 700px) {
  .compare { grid-template-columns: 1fr; }
}

.panel, .card {
  background: transparent;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 9px 11px;
  box-shadow: none;
}
.card:hover { border-color: var(--line); background: var(--tint); }
.panel { margin: 10px 0 12px; }
.card b { display: block; margin-bottom: 3px; color: var(--forest); }
.card p { font-size: 15px; color: var(--muted); line-height: 1.6; }
.card p:last-child { margin-bottom: 0; }

.grid-2, .grid-3, .grid-4 { display: grid; gap: 9px; margin: 10px 0 12px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ---------- 表格、代码、公式 ---------- */

table {
  width: 100%;
  border-collapse: collapse;
  background: transparent;
  font-size: 15px;
  margin: 8px 0 12px;
}
th, td {
  border-bottom: 1px solid var(--rule);
  padding: 6px 9px;
  text-align: left;
  vertical-align: top;
}
th {
  background: var(--chip);
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--forest);
  border-bottom-color: var(--line);
}
tbody tr:hover { background: var(--tint); }
.table-scroll { overflow-x: auto; margin: 8px 0 12px; }
.table-scroll table { margin: 0; }

kbd {
  font: 11px/1.5 var(--mono);
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 1px 5px;
  background: var(--paper);
  color: var(--muted);
}
code, .mono {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 1px 5px;
  border-radius: 5px;
}
.code-box { position: relative; margin: 8px 0 12px; }
.code-box pre {
  margin: 0;
}
.code-copy {
  position: absolute;
  top: 6px;
  right: 6px;
  border: 1px solid rgba(255, 250, 241, 0.28);
  background: rgba(255, 250, 241, 0.08);
  color: #e6dcc7;
  border-radius: 6px;
  padding: 2px 8px;
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.12s;
}
.code-box:hover .code-copy, .code-copy:focus-visible { opacity: 1; }
.code-copy:hover { background: rgba(255, 250, 241, 0.18); }
pre {
  background: var(--pre-bg);
  color: var(--pre-ink);
  border-radius: var(--radius);
  padding: 10px 12px;
  overflow: auto;
  font-size: 14px;
  line-height: 1.55;
  margin: 8px 0 12px;
}
pre code { background: none; color: inherit; padding: 0; font-size: 1em; }
.tok-kw { color: #ff8b6b; font-weight: 600; }
.tok-fn { color: #7dd3fc; }
.tok-str { color: #a3e635; }
.tok-com { color: #9a917f; font-style: italic; }
.tok-num { color: #fbbf24; }
.tok-op { color: #f0c36e; }
.tok-name { color: #f2ecdf; }
.tok-br0 { color: #ffd166; font-weight: 700; }
.tok-br1 { color: #7ec8e3; font-weight: 700; }
.tok-br2 { color: #f284b6; font-weight: 700; }
.tok-br3 { color: #8ed3a8; font-weight: 700; }
.tok-br4 { color: #c4b5fd; font-weight: 700; }
.tok-br5 { color: #fb923c; font-weight: 700; }

.formula {
  background: var(--tint);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 7px 9px;
  margin: 8px 0 10px;
  overflow-x: auto;
  text-align: center;
}
.formula svg,
figure.formula svg,
figure.diagram svg,
figure.flow svg,
figure.er svg {
  display: block;
  width: 100%;
  height: auto;
  max-height: none;
  margin: 0 auto;
}
.formula figcaption { font-size: 13.5px; color: var(--faint); margin-top: 4px; }
.formula .katex-display { margin: 0.35em 0; }
.formula .katex { font-size: 1.12em; }
.katex { font-size: 1.08em; }

figure.diagram {
  margin: 10px 0 14px;
  padding: 12px 10px 8px;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow-x: auto;
}
figure.diagram svg {
  display: block;
  width: 100%;
  height: auto;
  max-height: none;
}
figure.diagram figcaption,
figure.flow figcaption,
figure.er figcaption {
  font-size: var(--fs-small);
  color: var(--faint);
  text-align: center;
  margin: 8px 4px 2px;
}
figure.flow,
figure.er {
  margin: 10px 0 14px;
  padding: 8px 6px 6px;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  overflow-x: auto;
}
figure.flow svg,
figure.er svg {
  display: block;
  width: 100%;
  height: auto;
  max-height: none;
  overflow: hidden;
}
html[data-theme="night"] .formula { background: #f6f1e6; color: #1a1712; border-color: #d8cdb8; }
html[data-theme="night"] .formula figcaption { color: #6a6358; }
html[data-theme="night"] main.wrap > svg,
html[data-theme="night"] .read-article > svg,
html[data-theme="night"] figure > svg {
  background: #f6f1e6;
  border-radius: var(--radius);
}

.toc {
  background: var(--tint);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 9px 12px;
  margin: 10px 0 12px;
}
.toc b { font-size: 14px; color: var(--forest); }
.toc ol { margin: 6px 0 0; padding-left: 20px; font-size: 15px; }
.toc a { text-decoration: none; }
.toc a:hover { text-decoration: underline; }

.related { display: inline; margin: 0; }
.related a {
  display: inline;
  text-decoration: none;
  border: 0;
  background: none;
  border-radius: 0;
  padding: 0;
  font-size: inherit;
  color: var(--sky);
}
.related a:hover { border: 0; color: var(--forest); text-decoration: underline; }

.gh {
  display: inline-block;
  text-decoration: none;
  border: 1px solid var(--line);
  background: var(--tint);
  color: var(--forest);
  border-radius: 999px;
  padding: 3px 12px;
  font-size: var(--fs-small);
  margin: 0 6px 6px 0;
}
.gh:hover { background: var(--forest); color: var(--paper); border-color: var(--forest); }

/* ---------- 正文导航 ---------- */

.crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  align-items: center;
  font-size: 14px;
  color: var(--faint);
  margin: 0 0 10px;
}
.crumbs a { text-decoration: none; color: var(--muted); }
.crumbs a:hover { color: var(--forest); }
.crumbs .sep { color: var(--line); }

.page-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0 0 14px;
}
.tool-btn {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  border-radius: 999px;
  padding: 2px 11px;
  font: inherit;
  font-size: 14px;
  cursor: pointer;
}
.tool-btn:hover { border-color: var(--moss); color: var(--forest); }
.tool-btn.on { background: var(--sage); border-color: var(--moss); color: var(--forest); }

.read-layout { display: block; }
.page-toc {
  background: transparent;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 9px 11px;
  margin: 0 0 12px;
}
.page-toc b {
  font-size: 12.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
}
.page-toc ol { margin: 6px 0 0; padding: 0; list-style: none; counter-reset: toc; }
.page-toc li { margin: 0; counter-increment: toc; }
.page-toc a {
  display: block;
  text-decoration: none;
  font-size: 14px;
  line-height: 1.45;
  color: var(--muted);
  padding: 3px 0 3px 10px;
  border-left: 2px solid var(--rule);
}
.page-toc a:hover { color: var(--forest); border-left-color: var(--line); }
.page-toc a.on { color: var(--forest); border-left-color: var(--moss); font-weight: 600; }

.pager {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 10px;
  align-items: center;
  margin: 22px 0 0;
  padding-top: 12px;
  border-top: 1px solid var(--rule);
}
.pager-link {
  display: block;
  text-decoration: none;
  border: 1px solid var(--rule);
  background: transparent;
  border-radius: var(--radius);
  padding: 7px 10px;
  color: inherit;
}
.pager-link:hover { border-color: var(--moss); background: var(--tint); }
.pager-link span { display: block; color: var(--faint); font-size: 12.5px; letter-spacing: 0.08em; }
.pager-link b { color: var(--forest); font-size: 15px; }
.pager-link.next { text-align: right; }
.pager-pos { color: var(--faint); font-size: 14px; }

.to-top {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 30;
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--muted);
  border-radius: 999px;
  padding: 6px 13px;
  font: inherit;
  font-size: 14px;
  cursor: pointer;
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s;
}
.to-top.show { opacity: 1; pointer-events: auto; }
.to-top:hover { color: var(--forest); border-color: var(--moss); }

/* ---------- 检索 ---------- */

.search-modal {
  position: fixed;
  inset: 0;
  z-index: 80;
  background: rgba(26, 23, 18, 0.42);
  display: grid;
  place-items: start center;
  padding: 10vh 16px 16px;
}
.search-modal[hidden] { display: none; }
.search-panel {
  width: min(720px, 100%);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 20px 60px rgba(26, 23, 18, 0.28);
  padding: 12px;
}
.search-panel input[type="search"] { max-width: none; border-radius: 10px; }
.search-hits { display: grid; gap: 4px; margin-top: 10px; max-height: 54vh; overflow: auto; }
.search-hit {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  align-items: start;
  text-decoration: none;
  color: inherit;
  border: 1px solid transparent;
  border-radius: 9px;
  padding: 7px 9px;
}
.search-hit:hover { background: var(--tint); }
.search-hit.on { background: var(--sage); border-color: var(--moss); }
.hit-body { display: grid; gap: 1px; min-width: 0; }
.hit-body b { color: var(--forest); font-size: 15.5px; }
.hit-body small, .hit-body em {
  color: var(--faint);
  font-size: 14px;
  font-style: normal;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.hit-body em { color: var(--muted); }
.search-empty { color: var(--muted); font-size: 14.5px; margin: 10px 2px 0; }
.search-hint {
  color: var(--faint);
  font-size: 13px;
  margin: 10px 2px 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
}

/* ---------- 加改删命令生成器 ---------- */

.forge {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 11px 13px;
  margin: 10px 0 14px;
  background: var(--tint);
}
.forge-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 12px;
  margin-bottom: 10px;
}
.forge label { display: grid; gap: 3px; font-size: 13.5px; color: var(--faint); }
.forge input, .forge select {
  font: inherit;
  font-size: 14.5px;
  padding: 5px 9px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--paper);
  color: inherit;
  width: 100%;
}
.forge input:focus, .forge select:focus { border-color: var(--moss); outline: none; }
.forge-out { display: grid; gap: 7px; }
.forge-cmd {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  align-items: center;
  background: var(--pre-bg);
  color: var(--pre-ink);
  border-radius: 7px;
  padding: 7px 8px 7px 10px;
}
.forge-cmd code {
  background: none;
  color: inherit;
  padding: 0;
  font-size: 13.5px;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-all;
}
.forge-cmd button {
  border: 1px solid rgba(255, 250, 241, 0.28);
  background: rgba(255, 250, 241, 0.08);
  color: #e6dcc7;
  border-radius: 6px;
  padding: 3px 9px;
  font: inherit;
  font-size: 13px;
  cursor: pointer;
  white-space: nowrap;
}
.forge-cmd button:hover { background: rgba(255, 250, 241, 0.18); }
.forge-note { color: var(--faint); font-size: 13.5px; margin: 8px 0 0; }

.toast {
  position: fixed;
  left: 50%;
  bottom: 26px;
  transform: translateX(-50%) translateY(8px);
  z-index: 90;
  background: var(--forest);
  color: #fffaf1;
  border-radius: 999px;
  padding: 6px 16px;
  font-size: 14.5px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.16s, transform 0.16s;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- 页脚与登录 ---------- */

footer.site-foot {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 10px 22px;
  color: var(--faint);
  font-size: 13.5px;
}

.login-wrap { max-width: 480px; }
body[data-page="login"] main.wrap,
body[data-page="gate"] main.wrap {
  max-width: 480px;
  margin-top: 40px;
}
.login-card {
  background: var(--tint);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 16px 14px 14px;
  margin: 12px 0 14px;
}
.field { display: flex; flex-direction: column; gap: 6px; margin: 0 0 14px; }
.field > span { font-size: var(--fs-small); color: var(--muted); }
.field input {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--line);
  background: var(--paper);
  color: inherit;
  font: inherit;
  border-radius: 10px;
}
.field input:focus { outline: 2px solid var(--moss); outline-offset: 0; border-color: var(--moss); }
.captcha-row { display: flex; gap: 10px; align-items: center; }
.captcha-row input { flex: 1; }
.captcha-btn {
  border: 1px solid var(--line);
  background: var(--paper);
  border-radius: 10px;
  padding: 0;
  cursor: pointer;
  line-height: 0;
}
.captcha-btn img { display: block; border-radius: 9px; }
.primary {
  width: 100%;
  border: 0;
  background: var(--forest);
  color: #fffaf1;
  font: inherit;
  border-radius: 10px;
  padding: 10px 14px;
  cursor: pointer;
}
.primary:hover { background: var(--moss); }
.primary:disabled { opacity: 0.6; cursor: wait; }
.err { color: var(--clay); font-size: 15.5px; margin: 0 0 12px; }
.auth-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin: 0 0 4px; }
.auth-tabs a {
  text-decoration: none;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  border-radius: 999px;
  padding: 3px 12px;
  font-size: 15.5px;
}
.auth-tabs a.on, .auth-tabs a:hover { border-color: var(--moss); color: var(--forest); }

/* ---------- 响应式 ---------- */

@media (min-width: 1120px) {
  .read-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 186px;
    gap: 22px;
    align-items: start;
  }
  .page-toc {
    position: sticky;
    top: 56px;
    margin: 0;
    border: 0;
    border-left: 1px solid var(--rule);
    border-radius: 0;
    padding: 2px 0 2px 12px;
    max-height: calc(100vh - 90px);
    overflow: auto;
  }
}

@media (max-width: 900px) {
  .about-card { padding: 14px 16px; }
  .about-card .about-head { gap: 10px; }
  .about-body .about-list { columns: 1; }
  .home-tracks .rails { grid-template-columns: 1fr; }
  .grid-2, .grid-3, .grid-4, .catalog, .path, .pager, .forge-grid {
    grid-template-columns: 1fr;
  }
  .item:nth-child(2n), .path-step:nth-child(2n) { border-right: 0; }
  .item { border-right: 0; }
  h1 { font-size: 24px; }
  h2 { font-size: 19px; }
  .pager-link.next { text-align: left; }
  main.wrap {
    margin: 8px 8px 16px;
    padding: 14px 14px 22px;
    padding-bottom: calc(22px + env(safe-area-inset-bottom, 0px));
  }
  .site-bar {
    padding-top: env(safe-area-inset-top, 0px);
  }
  .site-bar nav {
    padding: 6px 12px;
    gap: 2px 8px;
  }
  .site-bar nav a,
  .site-bar nav button {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
    touch-action: manipulation;
  }
  .search-launch kbd,
  .search-hint { display: none; }
  .search-modal {
    padding: calc(10px + env(safe-area-inset-top, 0px)) 10px 10px;
    place-items: stretch center;
  }
  .search-panel { border-radius: 12px; }
  .search-hits { max-height: min(62vh, 520px); }
  .search-hit { min-height: 44px; padding: 10px 9px; }
  .item, .path-step, .pager-link { min-height: 44px; }
  .field input,
  .search-panel input[type="search"] { font-size: 16px; }
  .to-top {
    right: 10px;
    bottom: calc(10px + env(safe-area-inset-bottom, 0px));
    min-height: 44px;
    min-width: 44px;
  }
  .primary, .bar-btn, .code-copy { touch-action: manipulation; }
}

@media (max-width: 600px) {
  .site-bar .brand { font-size: 15px; margin-right: 2px; }
  .site-bar a { font-size: 14px; }
}

@media print {
  .site-bar, .page-tools, .pager, .to-top, .search-modal, .page-toc, .site-foot { display: none !important; }
  body { background: #fff; }
  main.wrap { border: 0; box-shadow: none; margin: 0; max-width: none; }
  pre { background: #f4f1ea; color: #1a1712; border: 1px solid #ddd; }
}