/* ==========================================================
   印刷纸白 · 墨蓝黑 · 朱批红
   一个字族，单栏，中文两端对齐，西文左对齐。
   ========================================================== */

:root {
  --paper:      #f5f6f4;
  --paper-well: #ebede8;
  --ink:        #1c1e22;
  --ink-soft:   #5a5f66;
  --ink-faint:  #8b9096;
  --rule:       #d8dbd6;
  --seal:       #8e2c3b;

  --latin: "Source Serif 4", Georgia, "Times New Roman", serif;
  --han: "Songti SC", "Source Han Serif SC", "Noto Serif CJK SC",
         "Noto Serif SC", "SimSun", serif;
  --han-sans: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC",
              "Microsoft YaHei", sans-serif;

  --measure: 37rem;
  --gutter: 1.5rem;
}

html[data-type="sans"] {
  --han: var(--han-sans);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:      #17191b;
    --paper-well: #1f2124;
    --ink:        #e2e4e0;
    --ink-soft:   #a2a7a9;
    --ink-faint:  #71767a;
    --rule:       #2f3236;
    --seal:       #cf6b74;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}

body {
  margin: 0;
  padding: 0 var(--gutter) 5rem;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--latin), var(--han);
  font-size: 1.125rem;
  line-height: 1.68;
  font-kerning: normal;
  text-rendering: optimizeLegibility;
}

/* 中文段落两端对齐：汉字等宽，不会出现西文那种断裂的空隙 */
:lang(zh-Hans) .prose p,
:lang(zh-Hans) .prose li,
:lang(zh-Hans) .standfirst-zh {
  text-align: justify;
  text-justify: inter-ideograph;
  line-height: 1.9;
}

/* ── 顶栏 ────────────────────────────────────────────────── */

.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: var(--gutter);
  top: .5rem;
  z-index: 10;
  padding: .4rem .7rem;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
}

.masthead {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 2.75rem 0 0;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.masthead-name {
  text-decoration: none;
  color: inherit;
  display: block;
}
.masthead-name-zh {
  display: block;
  font-family: var(--han), var(--latin);
  font-size: 1.0625rem;
  font-weight: 600;
}
.masthead-name-en {
  display: block;
  font-size: .8125rem;
  color: var(--ink-faint);
  letter-spacing: .01em;
}

.masthead-nav {
  display: flex;
  gap: 1.25rem;
  font-family: var(--han), var(--latin);
  font-size: .9375rem;
}
.masthead-nav a + a { margin-left: 1.25rem; }
.masthead-nav { gap: 0; }
.masthead-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
}
.masthead-nav a:hover { color: var(--ink); border-bottom-color: var(--rule); }
.masthead-nav a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--seal);
}

/* ── 首页 ────────────────────────────────────────────────── */

main {
  max-width: var(--measure);
  margin: 0 auto;
}

/* 全站唯一的大动作：一道朱批竖线，把中英两行绑成一个单元 */
.standfirst {
  margin: 3.5rem 0 4rem;
  padding-left: 1.125rem;
  border-left: 2px solid var(--seal);
}
.standfirst p { margin: 0; }
.standfirst-zh {
  font-family: var(--han), var(--latin);
  font-size: 1.25rem;
  line-height: 1.8;
}
.standfirst-en {
  margin-top: .5rem !important;
  font-size: .9375rem;
  font-style: italic;
  color: var(--ink-soft);
}

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

.entry {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 0 1.25rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--rule);
}
.entry:last-child { border-bottom: 1px solid var(--rule); }

.entry-date {
  font-size: .875rem;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
  padding-top: .3rem;
}

.entry-title {
  display: block;
  font-family: var(--han), var(--latin);
  font-size: 1.1875rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink);
  text-decoration: none;
}
.entry-title:hover { color: var(--seal); }

.entry-title-en {
  display: block;
  margin-top: .1875rem;
  font-size: .875rem;
  font-style: italic;
  color: var(--ink-faint);
}

.entry-summary {
  margin: .5rem 0 0;
  font-family: var(--han), var(--latin);
  font-size: .9375rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.empty {
  margin-top: 3rem;
  color: var(--ink-soft);
  font-family: var(--han), var(--latin);
  font-size: .9375rem;
}

/* ── 文章 ────────────────────────────────────────────────── */

.essay { margin-top: 3.5rem; }

.title-block {
  padding-left: 1.125rem;
  border-left: 2px solid var(--seal);
}
.title-block h1 {
  margin: 0;
  font-family: var(--han), var(--latin);
  font-size: 1.75rem;
  font-weight: 600;
  line-height: 1.45;
  letter-spacing: -.005em;
}
.title-en {
  margin: .4375rem 0 0;
  font-size: 1rem;
  font-style: italic;
  color: var(--ink-soft);
}

.dateline {
  margin: 1.25rem 0 2.75rem;
  font-size: .875rem;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
}
.revised { margin-left: .75rem; }

.prose > *:first-child { margin-top: 0; }

.prose p { margin: 0 0 1.4em; }

.prose h2 {
  margin: 2.75rem 0 1rem;
  font-family: var(--han), var(--latin);
  font-size: 1.1875rem;
  font-weight: 600;
  line-height: 1.55;
}
.prose h3 {
  margin: 2rem 0 .75rem;
  font-family: var(--han), var(--latin);
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--ink-soft);
}

.prose a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--rule);
  text-decoration-thickness: 1px;
  text-underline-offset: .18em;
}
.prose a:hover {
  color: var(--seal);
  text-decoration-color: var(--seal);
}

.prose blockquote {
  margin: 1.75rem 0;
  padding: 0 0 0 1.125rem;
  border-left: 1px solid var(--rule);
  color: var(--ink-soft);
  font-size: 1.0625rem;
}
.prose blockquote p:last-child { margin-bottom: 0; }

.prose ul, .prose ol { margin: 0 0 1.4em; padding-left: 1.4em; }
.prose li { margin-bottom: .4em; }

.prose hr {
  margin: 2.75rem auto;
  width: 3.5rem;
  border: 0;
  border-top: 1px solid var(--rule);
}

.prose img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 2rem auto;
}

.prose figure { margin: 2rem 0; }
.prose figcaption {
  margin-top: .625rem;
  font-family: var(--han), var(--latin);
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--ink-faint);
}

.prose code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: .875em;
  background: var(--paper-well);
  padding: .1em .35em;
  border-radius: 2px;
}
.prose pre {
  margin: 1.75rem 0;
  padding: 1rem 1.125rem;
  background: var(--paper-well);
  overflow-x: auto;
  font-size: .8125rem;
  line-height: 1.6;
}
.prose pre code { background: none; padding: 0; }

/* ── 标题锚 ──────────────────────────────────────────────── */

.heading-anchor {
  margin-left: .4em;
  color: var(--ink-faint);
  text-decoration: none;
  font-size: .8em;
  font-weight: 400;
  opacity: 0;
  transition: opacity .12s ease;
}
.prose h2:hover .heading-anchor,
.prose h3:hover .heading-anchor,
.heading-anchor:focus-visible { opacity: 1; }
.heading-anchor:hover { color: var(--seal); }

/* 触屏没有 hover，常驻但压淡 */
@media (hover: none) {
  .heading-anchor { opacity: .45; }
}

/* ── 代码块复制 ──────────────────────────────────────────── */

.has-copy { position: relative; }
.copy-btn {
  position: absolute;
  top: .5rem;
  right: .5rem;
  padding: .15em .5em;
  border: 1px solid var(--rule);
  border-radius: 2px;
  background: var(--paper);
  color: var(--ink-faint);
  font-family: var(--han), var(--latin);
  font-size: .75rem;
  line-height: 1.6;
  cursor: pointer;
  opacity: 0;
  transition: opacity .12s ease, color .12s ease, border-color .12s ease;
}
.has-copy:hover .copy-btn,
.copy-btn:focus-visible { opacity: 1; }
.copy-btn:hover { color: var(--ink); border-color: var(--ink-faint); }
.copy-btn.is-done { color: var(--seal); border-color: var(--seal); opacity: 1; }

@media (hover: none) {
  .copy-btn { opacity: .7; }
}

/* 外链的多媒体：保持 16:9，不撑破版心 */
.embed {
  margin: 2rem 0;
  position: relative;
  aspect-ratio: 16 / 9;
  background: var(--paper-well);
}
.embed iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* 脚注：朱批红只用在这里和那道竖线上 */
.prose sup[id^="fnref"] a,
.prose a.footnote {
  color: var(--seal);
  text-decoration: none;
  font-size: .75em;
  padding: 0 .1em;
}
.prose .footnotes {
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  font-size: .9375rem;
  color: var(--ink-soft);
}
.prose .footnotes ol { padding-left: 1.2em; }
.prose .footnotes li { margin-bottom: .625em; line-height: 1.75; }
.prose .footnotes p { margin: 0; }
:lang(zh-Hans) .prose .footnotes p { text-align: left; }

/* ── 前后篇 ──────────────────────────────────────────────── */

.siblings {
  max-width: var(--measure);
  margin: 4rem auto 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  display: flex;
  gap: 1.5rem;
  justify-content: space-between;
}
.sibling {
  text-decoration: none;
  max-width: 48%;
}
.sibling-fwd { text-align: right; margin-left: auto; }
.sibling-role {
  display: block;
  font-size: .8125rem;
  color: var(--ink-faint);
  font-family: var(--han), var(--latin);
}
.sibling-title {
  display: block;
  margin-top: .25rem;
  font-family: var(--han), var(--latin);
  font-size: .9375rem;
  line-height: 1.6;
  color: var(--ink-soft);
}
.sibling:hover .sibling-title { color: var(--seal); }

/* ── 页脚 ────────────────────────────────────────────────── */

.colophon {
  max-width: var(--measure);
  margin: 5rem auto 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  font-family: var(--han), var(--latin);
  font-size: .875rem;
}
.colophon-links {
  margin: 0 0 .5rem;
  display: flex;
  gap: 1.25rem;
}
.colophon-links { gap: 0; }
.colophon-links a + a { margin-left: 1.25rem; }
.colophon-links a {
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 1px;
}
.colophon-links a:hover { color: var(--seal); border-bottom-color: var(--seal); }
.colophon-note { margin: 0; color: var(--ink-faint); font-size: .8125rem; }

/* ── 焦点可见 ────────────────────────────────────────────── */

:focus-visible {
  outline: 2px solid var(--seal);
  outline-offset: 3px;
}

/* ── 窄屏 ────────────────────────────────────────────────── */

@media (max-width: 34rem) {
  body { font-size: 1.0625rem; padding-bottom: 3.5rem; }
  .masthead { padding-top: 1.75rem; }
  .standfirst { margin: 2.5rem 0 3rem; }
  .standfirst-zh { font-size: 1.125rem; }
  .entry {
    grid-template-columns: 1fr;
    gap: .375rem;
  }
  .entry-date { padding-top: 0; }
  .title-block h1 { font-size: 1.5rem; }
  .siblings { flex-direction: column; gap: 1.25rem; }
  .sibling, .sibling-fwd { max-width: 100%; text-align: left; margin-left: 0; }
}

/* ── 打印：给要打出来读的人 ──────────────────────────────── */

@media print {
  :root {
    --paper: #fff; --ink: #000; --ink-soft: #333;
    --ink-faint: #555; --rule: #bbb; --seal: #000;
  }
  body { font-size: 11pt; padding: 0; }
  .masthead-nav, .siblings, .colophon-links, .skip { display: none; }
  .heading-anchor, .copy-btn { display: none; }
  .prose a { text-decoration: none; }
  .prose a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: .8em;
    color: #555;
    word-break: break-all;
  }
  .embed { display: none; }
  .prose h2, .prose h3 { break-after: avoid; }
  .prose blockquote, .prose figure { break-inside: avoid; }
}