/* 旧书纸：左侧书签、首篇导读与双栏刊页；正文像展开的书页而非通用卡片。 */
:root {
  --bg: #e7dfcd;
  --surface: #faf3e3;
  --text: #473c2d;
  --muted: #7e715c;
  --line: #cdbf9f;
  --accent: #87502f;
  --soft: #eee2c8;
  --code: #ece2cd;
  --scrollbar: #b6a17a;
  --radius: 1px;
  --paper-shadow: #cabc9c;
  font-family: "Noto Serif SC", "Songti SC", "SimSun", serif;
}
:root.dark {
  --bg: #201d17;
  --surface: #2c281f;
  --text: #ede2cb;
  --muted: #bbae91;
  --line: #564b35;
  --accent: #e2b685;
  --soft: #3c3323;
  --code: #342e22;
  --scrollbar: #796548;
  --paper-shadow: #13110d;
}
.theme-paper {
  background-image: radial-gradient(var(--line) 0.45px, transparent 0.55px);
  background-size: 12px 13px;
}
.theme-paper .site-header {
  border-bottom: 0;
}
.theme-paper .header-inner {
  max-width: 1340px;
  min-height: 76px;
}
.theme-paper .brand {
  font-weight: 500;
  letter-spacing: 0.16em;
  font-size: 22px;
}
.paper-workspace {
  max-width: 1260px;
  padding: 30px 38px 48px;
  margin: 6px auto 32px;
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow:
    6px 6px 0 -1px var(--surface),
    6px 6px 0 var(--line),
    12px 12px 0 -1px var(--surface),
    12px 12px 0 var(--line),
    0 18px 36px -20px var(--paper-shadow);
}
.paper-masthead {
  padding: 0 0 30px;
  margin-bottom: 30px;
  border-bottom: 4px double var(--text);
  text-align: center;
}
.paper-edition {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.12em;
}
.paper-masthead h1 {
  font-size: clamp(34px, 4.8vw, 64px);
  letter-spacing: 0.18em;
  font-weight: 600;
  line-height: 1.3;
  margin: 24px 0 14px;
  overflow-wrap: anywhere;
}
.paper-masthead > p {
  color: var(--muted);
  font-size: 14px;
  margin: 0 auto;
  max-width: 38em;
}
.paper-rule {
  margin: 20px auto 0;
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 190px;
  color: var(--accent);
  font-size: 10px;
}
.paper-rule::before,
.paper-rule::after {
  content: "";
  height: 1px;
  background: var(--line);
  flex: 1;
}
.paper-columns {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr);
  gap: 30px;
  align-items: start;
}
.paper-columns > .home-rail {
  grid-column: 1;
  grid-row: 1;
}
.paper-editorial {
  grid-column: 2;
  grid-row: 1;
  border-left: 1px solid var(--line);
  padding-left: 30px;
}
.paper-workspace .home-rail {
  gap: 24px;
}
.paper-workspace .sidebar-section h2 {
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 0.22em;
  color: var(--accent);
  border-bottom: 1px solid var(--line);
  padding-bottom: 10px;
}
.paper-workspace .theme-list-heading {
  margin-bottom: 18px;
}
.paper-workspace .theme-list-title {
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.22em;
}
.paper-entries {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 28px;
}
.paper-entries .paper-entry {
  display: flex;
  flex-direction: column;
  min-width: 0;
  border-bottom: 1px solid var(--line);
  padding: 24px 0;
}
.paper-entry:first-child {
  grid-column: 1 / -1;
  padding-top: 4px;
  border-bottom: 3px double var(--line);
  padding-bottom: 28px;
}
.paper-entry:first-child h2 {
  font-size: 34px;
  font-weight: 600;
}
.paper-entry h2 {
  font-size: 25px;
  font-weight: 500;
  letter-spacing: 0;
}
.paper-entry .entry-categories {
  margin-bottom: 12px;
  letter-spacing: 0.1em;
}
.paper-entry .card-summary {
  line-height: 2.05;
}
.paper-entry:first-child .card-summary::first-letter {
  font-size: 2em;
  color: var(--accent);
  font-weight: 500;
}
.paper-byline {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: auto;
  padding-top: 8px;
}
.paper-reading {
  display: grid;
  grid-template-columns: 186px minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}
.paper-leaf {
  padding-left: 32px;
  border-left: 1px solid var(--line);
}
.paper-workspace .article-header {
  padding: 8px 0 28px;
  border-bottom: 4px double var(--text);
  text-align: center;
}
.paper-workspace .article-header h1 {
  font-size: clamp(30px, 3.5vw, 44px);
  font-weight: 500;
  letter-spacing: 0.04em;
}
.paper-workspace .article-header .metadata,
.paper-workspace .article-header .chips {
  justify-content: center;
}
.paper-workspace .prose {
  line-height: 2.15;
}
.paper-workspace .prose h2 {
  font-weight: 500;
  border-bottom: 1px solid var(--line);
  padding-bottom: 10px;
}
.paper-workspace .ad-card {
  border: 1px solid var(--line);
  border-radius: 0;
  background: var(--soft);
}
.paper-workspace .ad-copy {
  padding: 14px;
}
.theme-paper .site-footer {
  border: 0;
}
@media (max-width: 1100px) {
  .paper-workspace {
    padding-left: 26px;
    padding-right: 26px;
  }
  .paper-columns {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 24px;
  }
  .paper-editorial {
    padding-left: 24px;
  }
  .paper-entries {
    grid-template-columns: minmax(0, 1fr);
  }
  .paper-entry:first-child h2 {
    font-size: 30px;
  }
}
@media (max-width: 980px) {
  .paper-reading {
    display: flex;
    flex-direction: column;
  }
  .paper-leaf {
    width: 100%;
    order: 0;
    border: 0;
    padding: 0;
  }
  .paper-reading .article-rail {
    width: 100%;
    order: 1;
  }
}
@media (max-width: 760px) {
  .paper-workspace {
    width: calc(100% - 28px);
    padding: 22px 20px 30px;
    margin: 8px auto 24px;
    box-shadow:
      4px 4px 0 -1px var(--surface),
      4px 4px 0 var(--line);
  }
  .paper-masthead {
    padding-bottom: 24px;
    margin-bottom: 24px;
  }
  .paper-masthead h1 {
    font-size: 34px;
    letter-spacing: 0.12em;
  }
  .paper-edition {
    font-size: 10px;
    letter-spacing: 0;
  }
  .paper-columns {
    display: flex;
    flex-direction: column;
    gap: 20px;
  }
  .paper-editorial {
    order: 0;
    width: 100%;
    padding: 0;
    border: 0;
  }
  .paper-columns > .home-rail {
    order: 1;
    width: 100%;
  }
  .paper-entry:first-child h2 {
    font-size: 27px;
  }
  .paper-entry h2 {
    font-size: 24px;
  }
}
.paper-columns.paper-archive {
  display: block;
}
.paper-archive .paper-editorial {
  padding: 0;
  border: 0;
}