:root {
  --bg: #ffffff;
  --text: #1f2328;
  --muted: #656d76;
  --faint: #8c959f;
  --border: #d8dee4;
  --border-soft: #eaeef2;
  --link: #0969da;
  --code-bg: #f6f8fa;
  --sans: "楷体-简", "Kaiti SC", "STKaiti", "Kaiti", "KaiTi", "楷体", "Songti SC", serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html { color-scheme: light; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 24px;
}

/* header */
.site-header {
  border-bottom: 1px solid var(--border-soft);
  background: var(--bg);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 58px;
}

.site-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  font-size: 14px;
  color: var(--muted);
}

.site-nav a { color: var(--muted); }
.site-nav a:hover { color: var(--link); }

/* home */
.home {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 240px;
  gap: 56px;
  padding: 40px 0 64px;
  align-items: start;
}

.section-title {
  margin: 0 0 4px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
  font-size: 19px;
  font-weight: 600;
}

.post-list { list-style: none; margin: 0; padding: 0; }

.post-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--border-soft);
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--faint);
}

.post-item h2 {
  margin: 6px 0 6px;
  font-size: 18px;
  font-weight: 600;
  line-height: 1.5;
}

.post-item h2 a { color: var(--text); }
.post-item h2 a:hover { color: var(--link); text-decoration: none; }

.post-item p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
}

/* sidebar */
.side-block { margin-bottom: 32px; }

.side-block h2 {
  margin: 0 0 10px;
  padding-bottom: 7px;
  border-bottom: 1px solid var(--border-soft);
  font-size: 14px;
  font-weight: 600;
}

.side-block p {
  margin: 0 0 8px;
  font-size: 13.5px;
  color: var(--muted);
  line-height: 1.75;
}

.side-list { list-style: none; margin: 0; padding: 0; }

.side-list li {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 4px 0;
  font-size: 13.5px;
}

.side-list li span {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--faint);
}

.side-tags { display: flex; flex-wrap: wrap; gap: 8px 12px; }
.side-tags a { font-size: 13px; color: var(--muted); }
.side-tags a:hover { color: var(--link); }

/* page & post */
.post, .page {
  max-width: 720px;
  margin: 0 auto;
  padding: 44px 0 56px;
}

.post-header { margin-bottom: 28px; }

.post-header h1 {
  margin: 0 0 10px;
  font-size: 30px;
  line-height: 1.4;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.post-header .post-meta { gap: 14px; }

.prose { font-size: 16px; line-height: 1.85; }

.prose p { margin: 1.1em 0; }

.prose h2 {
  margin: 2em 0 0.8em;
  font-size: 22px;
  line-height: 1.5;
  font-weight: 650;
}

.prose h3 {
  margin: 1.6em 0 0.6em;
  font-size: 18px;
  font-weight: 600;
}

.prose a { text-decoration: underline; text-underline-offset: 2px; }

.prose blockquote {
  margin: 1.4em 0;
  padding: 0 0 0 14px;
  border-left: 3px solid var(--border);
  color: var(--muted);
}

.prose code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--code-bg);
  padding: 2px 5px;
  border-radius: 4px;
}

.prose pre { margin: 1.4em 0; overflow-x: auto; }

.prose pre code { padding: 0; background: none; font-size: 13.5px; }

.prose figure.highlight {
  margin: 1.5em 0;
  border: 1px solid var(--border-soft);
  border-radius: 6px;
  overflow: hidden;
  background: var(--code-bg);
}

.prose figure.highlight table { width: 100%; border-collapse: collapse; margin: 0; }
.prose figure.highlight td { border: 0; padding: 0; }

.prose figure.highlight .gutter {
  width: 42px;
  padding: 14px 0 14px 12px;
  color: var(--faint);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.7;
  text-align: right;
  vertical-align: top;
  user-select: none;
}

.prose figure.highlight .code { padding: 14px 16px; }
.prose figure.highlight pre { margin: 0; background: none; }

.prose figure.highlight code {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.7;
  background: none;
}

.prose figure.highlight .line { display: inline; }

.prose img { max-width: 100%; height: auto; }

.prose table { width: 100%; border-collapse: collapse; margin: 1.4em 0; font-size: 14px; }
.prose th, .prose td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; }
.prose th { background: var(--code-bg); font-weight: 600; }

.prose hr { border: 0; border-top: 1px solid var(--border-soft); margin: 2em 0; }

/* hexo highlight tokens */
.prose figure.highlight .comment,
.prose figure.highlight .quote { color: #6e7781; font-style: italic; }
.prose figure.highlight .keyword,
.prose figure.highlight .literal,
.prose figure.highlight .selector-tag { color: #cf222e; }
.prose figure.highlight .string,
.prose figure.highlight .doctag,
.prose figure.highlight .regexp { color: #0a3069; }
.prose figure.highlight .number,
.prose figure.highlight .symbol,
.prose figure.highlight .bullet { color: #953800; }
.prose figure.highlight .title,
.prose figure.highlight .section,
.prose figure.highlight .name { color: #8250df; }
.prose figure.highlight .type,
.prose figure.highlight .built_in { color: #0550ae; }
.prose figure.highlight .attr,
.prose figure.highlight .attribute,
.prose figure.highlight .variable { color: #116329; }

/* tags / nav */
.post-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
  padding-top: 16px;
  border-top: 1px solid var(--border-soft);
  font-size: 13px;
}

.post-tags a { color: var(--muted); }
.post-tags a:hover { color: var(--link); }

.post-nav {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  margin-top: 32px;
  padding-top: 16px;
  border-top: 1px solid var(--border-soft);
  font-size: 14px;
}

.post-nav .next { margin-left: auto; text-align: right; }

/* comments */
.comments {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.comments h2 { margin: 0 0 4px; font-size: 18px; }
.comments-note { margin: 0 0 16px; font-size: 13px; color: var(--muted); }
.giscus, .giscus-frame { width: 100%; }

/* page header / lists */
.page-header {
  padding: 40px 0 16px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 8px;
}

.page-header h1 { margin: 0 0 4px; font-size: 26px; font-weight: 650; }
.page-header p { margin: 0; font-size: 13px; color: var(--muted); }

.archive-year { margin-top: 28px; }
.archive-year h2 { margin: 0 0 8px; font-size: 16px; }

.archive-year ul, .simple-list { list-style: none; margin: 0; padding: 0; }

.archive-year li, .simple-list li {
  display: flex;
  gap: 16px;
  padding: 7px 0;
  border-bottom: 1px solid var(--border-soft);
  font-size: 14px;
}

.archive-year time, .simple-list time {
  flex: 0 0 52px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--faint);
  padding-top: 3px;
}

.term-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  padding: 24px 0 56px;
}

.term-list a { font-size: 14px; }
.term-list a span { color: var(--faint); font-family: var(--mono); font-size: 11px; }

/* friends */
.friend-list { list-style: none; margin: 24px 0 32px; padding: 0; }

.friend-list li {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr) auto;
  gap: 20px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-soft);
  font-size: 14px;
}

.friend-list li a { font-weight: 600; }
.friend-list li span { color: var(--muted); }
.friend-list li em { font-style: normal; font-family: var(--mono); font-size: 11.5px; color: var(--faint); }
.friend-note { font-size: 14px; color: var(--muted); }

.pager {
  display: flex;
  justify-content: space-between;
  padding-top: 20px;
  font-size: 13px;
  color: var(--muted);
}

.notfound { padding: 100px 0; text-align: center; }
.notfound h1 { font-size: 40px; margin: 0 0 8px; }

/* footer */
.site-footer {
  margin-top: 40px;
  border-top: 1px solid var(--border-soft);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 0 32px;
  font-size: 12px;
  color: var(--faint);
}

@media (max-width: 760px) {
  .header-inner { flex-wrap: wrap; gap: 8px 16px; padding: 12px 0; }
  .site-nav { gap: 14px; font-size: 13px; }
  .home { grid-template-columns: 1fr; gap: 36px; padding-top: 28px; }
  .post, .page { padding-top: 32px; }
  .post-header h1 { font-size: 25px; }
  .friend-list li { grid-template-columns: 1fr; gap: 2px; }
  .footer-inner { flex-direction: column; gap: 4px; }
}

/* ============================================================
   TiO₂ 风格阅读排版
   ============================================================ */

:root {
  --serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", "SimSun", "Times New Roman", serif;
}

html[data-theme="dark"] {
  --bg: #0e1116;
  --text: #e6edf3;
  --muted: #9aa4af;
  --faint: #6e7681;
  --border: #30363d;
  --border-soft: #21262d;
  --link: #58a6ff;
  --code-bg: #161b22;
}

html[data-theme="dark"] body { background: var(--bg); color: var(--text); }

.site-title,
.section-title,
.post-header h1,
.prose h2,
.prose h3,
.page-header h1,
.side-block h2,
.toc-title,
.friend-list li a {
  font-family: var(--serif);
}

.site-title { font-weight: 700; letter-spacing: 0.02em; }

.prose {
  font-size: 17px;
  line-height: 1.95;
}

.prose p { margin: 1.15em 0; }

.prose h2 {
  margin: 2.4em 0 1em;
  padding-bottom: 0.35em;
  border-bottom: 1px solid var(--border-soft);
  font-size: 23px;
  line-height: 1.55;
  font-weight: 700;
}

.prose h3 {
  margin: 1.9em 0 0.7em;
  font-size: 19px;
  font-weight: 700;
}

.prose blockquote {
  padding-left: 16px;
  border-left: 2px solid var(--border);
  color: var(--muted);
}

.prose figure.highlight {
  border-radius: 4px;
  background: var(--code-bg);
  overflow-x: auto;
}

.prose figure.highlight table { width: auto; min-width: 100%; }

/* 文章布局：正文 + 右侧目录 */
.post-layout {
  display: grid;
  grid-template-columns: minmax(0, 720px) 200px;
  gap: 56px;
  justify-content: center;
  max-width: 1040px;
  margin: 0 auto;
  padding: 52px 24px 72px;
}

.post-layout.no-toc {
  grid-template-columns: minmax(0, 720px);
}

.post-layout .post {
  max-width: none;
  margin: 0;
  padding: 0;
}

.post-layout .post-header h1 {
  font-size: 34px;
  line-height: 1.45;
  font-weight: 700;
  letter-spacing: 0.01em;
}

/* 编号目录 */
.toc-side {
  position: sticky;
  top: 78px;
  align-self: start;
  max-height: calc(100vh - 110px);
  overflow: auto;
  padding-left: 16px;
  border-left: 1px solid var(--border-soft);
  font-size: 13px;
  line-height: 1.75;
}

.toc-side .toc-title {
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 13px;
  letter-spacing: 0.08em;
}

.toc-side ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

.toc-side ol ol { padding-left: 12px; }

.toc-side li { margin: 3px 0; }

.toc-side a {
  color: var(--muted);
  text-decoration: none;
}

.toc-side a:hover { color: var(--text); }

.toc-side a.active {
  color: var(--link);
  font-weight: 600;
}

.toc-number {
  margin-right: 4px;
  color: var(--faint);
  font-family: var(--mono);
  font-size: 11px;
}

/* 手机端目录 */
.toc-inline {
  display: none;
  margin: 0 0 24px;
  padding: 10px 14px;
  border: 1px solid var(--border-soft);
  border-radius: 4px;
  font-size: 14px;
}

.toc-inline summary {
  cursor: pointer;
  color: var(--muted);
}

.toc-inline ol {
  list-style: none;
  margin: 10px 0 0;
  padding: 0 0 0 4px;
  font-size: 13px;
}

.toc-inline ol ol { padding-left: 14px; }
.toc-inline li { margin: 4px 0; }
.toc-inline a { color: var(--muted); }

/* 阅读进度 */
.progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--link);
  z-index: 100;
  transition: width 0.08s linear;
}

/* 明暗切换 */
.theme-toggle {
  padding: 0 0 0 2px;
  border: 0;
  background: none;
  color: var(--muted);
  font-size: 15px;
  line-height: 1;
  cursor: pointer;
}

.theme-toggle:hover { color: var(--link); }

/* 暗色代码配色 */
html[data-theme="dark"] .prose figure.highlight .comment,
html[data-theme="dark"] .prose figure.highlight .quote { color: #8b949e; }
html[data-theme="dark"] .prose figure.highlight .keyword,
html[data-theme="dark"] .prose figure.highlight .literal,
html[data-theme="dark"] .prose figure.highlight .selector-tag { color: #ff7b72; }
html[data-theme="dark"] .prose figure.highlight .string,
html[data-theme="dark"] .prose figure.highlight .doctag,
html[data-theme="dark"] .prose figure.highlight .regexp { color: #a5d6ff; }
html[data-theme="dark"] .prose figure.highlight .number,
html[data-theme="dark"] .prose figure.highlight .symbol,
html[data-theme="dark"] .prose figure.highlight .bullet { color: #79c0ff; }
html[data-theme="dark"] .prose figure.highlight .title,
html[data-theme="dark"] .prose figure.highlight .section,
html[data-theme="dark"] .prose figure.highlight .name { color: #d2a8ff; }
html[data-theme="dark"] .prose figure.highlight .type,
html[data-theme="dark"] .prose figure.highlight .built_in { color: #79c0ff; }
html[data-theme="dark"] .prose figure.highlight .attr,
html[data-theme="dark"] .prose figure.highlight .attribute,
html[data-theme="dark"] .prose figure.highlight .variable { color: #7ee787; }

@media (max-width: 980px) {
  .post-layout {
    grid-template-columns: minmax(0, 720px);
    padding-top: 36px;
  }
  .toc-side { display: none; }
  .toc-inline { display: block; }
}

@media (max-width: 760px) {
  .post-layout { padding-top: 28px; padding-bottom: 48px; }
  .post-layout .post-header h1 { font-size: 26px; }
  .prose { font-size: 16px; }
  .prose h2 { font-size: 20px; }
}