/* TOP: simple HTML-first layout, inspired by early academic websites. */

html { background: #f2efe8; }

body {
  margin: 0;
  padding: 0;
  color: #292725;
  background: #f2efe8;
  font-family: "Noto Serif SC", "Source Han Serif SC", "Songti SC", Georgia, serif;
  font-size: 17px;
  line-height: 1.68;
}

* {
  box-sizing: border-box;
}

a:link, a:visited { color: #8f3f32; text-decoration: none; }

a:hover,
a:focus-visible {
  text-decoration: underline;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  padding: 0;
  color: #292725;
  font-family: inherit;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2rem, 5vw, 3.2rem); line-height: 1.15; }

h2 { font-size: 1.05rem; }

h3,
h4 {
  font-size: 1rem;
}

p {
  margin: 0 0 0.8em;
}

ul {
  list-style-type: square;
}

.shell { width: min(100% - 56px, 1040px); margin: 0 auto; }

.skip-link {
  position: absolute;
  left: -9999px;
}

.skip-link:focus {
  top: 4px;
  left: 10px;
  z-index: 10;
  padding: 2px 5px;
  background: #fff;
  border: 1px solid #ccc;
}

.site-header { width: 100%; max-width: none; padding-top: 26px; padding-bottom: 18px; border-bottom: 1px solid #d6cfc3; }

.masthead {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 14px;
  padding-bottom: 14px;
}

.brand { color: #292725 !important; font-size: 1.2rem; font-weight: 700; letter-spacing: .08em; }

.brand span {
  color: inherit;
}

.main-link { color: #746e65 !important; font-size: .9rem; }

.section-nav {
  overflow-x: auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px 22px;
  white-space: nowrap;
}

.section-nav a {
  display: inline-block;
  padding: 4px 0;
  color: #746e65;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 1.06rem;
  line-height: 1.4;
  letter-spacing: .04em;
}

.section-nav .is-current {
  color: #8f3f32;
  font-weight: bold;
}

.nav-search {
  display: inline-flex;
  align-items: center;
  width: 220px;
  margin-left: 4px;
  border: 1px solid #bdb3a7;
  background: #faf8f3;
}

.nav-search input {
  width: 100%;
  padding: 7px 10px;
  border: 0;
  outline: 0;
  color: #292725;
  background: transparent;
  font: inherit;
  font-size: .9rem;
}

.nav-search button {
  padding: 5px 10px;
  border: 0;
  color: #8f3f32;
  background: transparent;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 1.15rem;
  cursor: pointer;
}

.intro, .category-head, .article-head { padding: 58px 0 30px; }

.intro { max-width: 850px; }

.intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 180px;
  gap: 56px;
  align-items: end;
}

.year-mark {
  display: grid;
  place-items: center;
  align-content: center;
  width: 180px;
  height: 180px;
  border: 1px solid #cdb8ae;
  background: #eee3dc;
  color: #8f3f32;
  text-align: center;
}

.year-mark span {
  font-size: .78rem;
  letter-spacing: .16em;
}

.year-mark strong {
  display: block;
  margin: 2px 0 4px;
  font-size: 3.35rem;
  font-weight: 500;
  line-height: .95;
  letter-spacing: -.08em;
}

.year-mark small {
  color: #765e55;
  font-size: .66rem;
  letter-spacing: .16em;
  line-height: 1.35;
}

.intro h1, .category-head h1, .article-head h1 { margin-bottom: 16px; }

.intro > p:not(.label),
.category-head > p:last-child,
.article-head > p:last-child {
  max-width: 760px;
  margin-bottom: 10px;
}

.label,
.category-title > span,
.entry-meta,
.entry-number,
.number,
.block-head > span {
  color: #746e65;
  font-size: 0.82em;
  letter-spacing: .08em;
}

.label {
  margin-bottom: 5px;
}

.block { clear: both; padding: 24px 0; border-top: 1px solid #d6cfc3; }

.home-search {
  max-width: 760px;
  padding: 30px 0 34px;
  border-top: 1px solid #d6cfc3;
}

.home-search h2 { margin-bottom: 4px; }
.home-search p { color: #746e65; }
.home-search .search-note { margin-top: 8px; font-size: .9em; }

.stats-block {
  padding: 24px 0 10px;
  border-top: 1px solid #d6cfc3;
}

.stats-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 12px;
}

.stats-heading span { color: #746e65; font-size: .78em; }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  border-top: 1px solid #dcd5ca;
  border-left: 1px solid #dcd5ca;
}

.stats-grid div {
  display: flex;
  min-height: 92px;
  padding: 14px;
  flex-direction: column;
  justify-content: space-between;
  border-right: 1px solid #dcd5ca;
  border-bottom: 1px solid #dcd5ca;
}

.stats-grid strong {
  color: #8f3f32;
  font-size: 1.7rem;
  font-weight: 500;
  line-height: 1;
}

.stats-grid span { color: #746e65; font-size: .86em; }

.block > h2,
.block-head h2,
.text-section h2 {
  margin-bottom: 6px;
}

.index-list,
.entry-list,
.section-links {
  margin: 0;
  padding: 0;
}

.index-list a { display: grid; grid-template-columns: 140px minmax(0, 1fr) 24px; gap: 14px; align-items: baseline; padding: 12px 0; border-bottom: 1px solid #dcd5ca; transition: background .15s ease, padding-left .15s ease, padding-right .15s ease; }

.index-list a:hover,
.index-list a:focus-visible {
  padding-right: 8px;
  padding-left: 8px;
  background: #ebe5da;
  text-decoration: none;
}

.index-list .number {
  display: inline-block;
  width: 28px;
}

.index-list strong { display: inline-block; font-size: 1.02em; }

.index-list i { display: block; color: #126b5b; font-style: normal; text-align: right; }

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

.plain-list li { display: grid; grid-template-columns: 48px 1fr; gap: 14px; padding: 9px 0; border-bottom: 1px solid #dcd5ca; }

.plain-list li > span { display: block; color: #8f3f32; font-variant-numeric: tabular-nums; }

.plain-list p {
  display: inline;
  margin: 0;
}

.footer {
  clear: both;
  display: flex;
  gap: 12px;
  margin-top: 30px;
  padding-top: 18px;
  padding-bottom: 24px;
  border-top: 1px solid #d6cfc3;
  color: #746e65;
  font-size: .82rem;
}

.site-stats { margin-left: auto; color: #746e65; }
.language-toggle {
  border: 1px solid #cfc5b8;
  background: transparent;
  color: #8f3f32;
  padding: .35rem .65rem;
  font: inherit;
  cursor: pointer;
}
.article-en { display: none; }
body.lang-en .article-zh { display: none; }
body.lang-en .article-en { display: inline; }
.english-summary { border-left: 3px solid #8f3f32; padding-left: 1rem; margin-bottom: 2rem; }
.english-note { color: #746e65; font-size: .95em; }
.source-original { margin-top: 2rem; border-top: 1px solid #d9d0c5; padding-top: 1rem; }
.source-original summary { cursor: pointer; color: #8f3f32; }

/* Category */

.category-title {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.category-title > span {
  color: #8f3f32;
  font-size: 1.05rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: .08em;
}

.category-head > p:last-child {
  max-width: 850px;
}

.category-head,
.article-head {
  position: relative;
}

.category-head::before,
.article-head::before {
  position: absolute;
  top: 86px;
  left: -18px;
  width: 3px;
  height: 52px;
  background: #8f3f32;
  content: "";
}

.block-head {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.entry-row { display: grid; grid-template-columns: minmax(0, 1fr) 24px; gap: 14px; padding: 12px 0; border-bottom: 1px solid #dcd5ca; transition: background .15s ease, padding-left .15s ease, padding-right .15s ease; }

.entry-row:hover,
.entry-row:focus-visible {
  padding-right: 8px;
  padding-left: 8px;
  background: #ebe5da;
  text-decoration: none;
}

.entry-number {
  display: inline-block;
  width: 28px;
  vertical-align: top;
}

.entry-body { display: grid; grid-template-columns: minmax(0, 1fr); gap: 2px; }

.entry-meta { margin-right: 6px; }

.entry-body strong { color: #292725; }

.entry-description { color: #746e65; font-size: .92em; }

.entry-description mark {
  padding: 0 2px;
  color: #7c3026;
  background: #efd3c8;
  font-weight: 700;
}

.article-body mark.article-highlight {
  padding: 0 2px;
  color: #7c3026;
  background: #efd3c8;
  font-weight: 700;
}

.arrow { display: block; color: #8f3f32; text-align: right; }

.empty-state {
  color: #777;
}

.search-main { max-width: 900px; }

.search-form {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  max-width: 760px;
  margin-bottom: 14px;
}

.search-form input {
  min-width: 0;
  padding: 12px 14px;
  border: 1px solid #cfc6b9;
  border-radius: 0;
  color: #292725;
  background: #faf8f3;
  font: inherit;
}

.search-form input:focus {
  outline: 2px solid #c79a8e;
  outline-offset: 2px;
}

.search-form button {
  padding: 10px 22px;
  border: 1px solid #8f3f32;
  border-radius: 0;
  color: #f9f5ef;
  background: #8f3f32;
  font: inherit;
  cursor: pointer;
}

.search-form button:hover,
.search-form button:focus-visible { background: #743126; }

.search-status { color: #746e65; font-size: .9em; }

.search-options {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 22px;
  margin: 8px 0 18px;
  color: #746e65;
  font-size: .88em;
}

.search-options label { display: inline-flex; align-items: center; gap: 7px; }

.search-options select {
  padding: 4px 24px 4px 7px;
  border: 1px solid #cfc6b9;
  border-radius: 0;
  color: #292725;
  background: #faf8f3;
  font: inherit;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.section-links a {
  display: inline-block;
  padding: 2px 10px 2px 0;
}

.section-links .is-current {
  color: #333;
  font-weight: bold;
}

/* Article */

.article-main {
  max-width: 1000px;
}

.article-head { border-bottom: 1px solid #d6cfc3; }

.article-head .label { color: #8f3f32; }

.article-body { max-width: 860px; padding: 24px 0 34px; }

.article-body h2 {
  margin: 18px 0 6px;
  color: #8f3f32;
  font-size: 1.18rem;
}

.article-body h3,
.article-body h4 {
  margin: 14px 0 5px;
}

.article-body p,
.article-body ul,
.article-body ol,
.article-body blockquote {
  margin-top: 0;
  margin-bottom: 0.9em;
}

.article-body blockquote {
  margin-left: 10px;
  padding-left: 10px;
  border-left: 2px solid #ccc;
  color: #555;
}

.article-body hr {
  margin: 16px 0;
  border: 0;
  border-top: 1px solid #d6cfc3;
}

.article-end {
  display: flex;
  gap: 12px;
  padding: 8px 0;
  border-top: 1px solid #ccc;
}

/* About */

.text-section {
  max-width: 900px;
  padding: 20px 0;
  border-top: 1px solid #d6cfc3;
}

.text-section p {
  margin-bottom: 0.7em;
}

.text-section ul {
  margin-top: 0;
  padding-left: 24px;
}

.changelog article {
  display: flex;
  gap: 10px;
}

.changelog time {
  color: #777;
  white-space: nowrap;
}

@media (max-width: 600px) {
  body {
    font-size: 14px;
  }

  .shell {
  width: min(100% - 28px, 1040px);
  }

  body { font-size: 16px; }
  .intro-grid { grid-template-columns: 1fr; gap: 28px; }
  .year-mark { width: 132px; height: 132px; }
  .year-mark strong { font-size: 2.55rem; }
  .category-head::before,
  .article-head::before { left: -10px; top: 86px; }
  .index-list a { grid-template-columns: minmax(0, 1fr) 18px; gap: 8px; }
  .index-list a > span { grid-column: 1; color: #6c766f; }
  .index-list strong { grid-column: 1; }
  .plain-list li { grid-template-columns: 36px 1fr; gap: 8px; }
  .entry-row { grid-template-columns: minmax(0, 1fr) 18px; gap: 8px; }
  .search-form { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stats-grid div:last-child { grid-column: span 2; }
  .nav-search { width: min(100%, 260px); margin-left: 0; }
  .site-stats { width: 100%; margin-left: 0; }

  .entry-meta,
  .entry-description {
    display: block;
    margin-left: 0;
  }

  .changelog article {
    display: block;
  }
}